WorldWideScience

Sample records for bromodeoxyuridine

  1. Discrimination of bromodeoxyuridine labelled and unlabelled mitotic cells in flow cytometric bromodeoxyuridine/DNA analysis

    DEFF Research Database (Denmark)

    Jensen, P O; Larsen, J K; Christensen, I J

    1994-01-01

    Bromodeoxyuridine (BrdUrd) labelled and unlabelled mitotic cells, respectively, can be discriminated from interphase cells using a new method, based on immunocytochemical staining of BrdUrd and flow cytometric four-parameter analysis of DNA content, BrdUrd incorporation, and forward and orthogona...

  2. [Br-76]bromodeoxyuridine PET in tumor-bearing animals

    NARCIS (Netherlands)

    Gardelle, O; Roelcke, U; Vontobel, P; Crompton, NEA; Guenther, [No Value; Blauenstein, P; Schubiger, AP; Blattmann, H; Ryser, JE; Leenders, KL; Kaser-Hotz, B

    2001-01-01

    5-bromodeoxyuridine (BUdR) provides in vitro measures of tumor cell proliferation. We used positron emission tomography to study tissue and plasma kinetics of [Br-76]BUdR in tumor-bearing animals. In order to account for the slow washout of the major plasma metabolite, [Br-76]bromide, a mathematical

  3. Bromodeoxyuridine does not contribute to sister chromatid exchange events in normal or Bloom syndrome cells

    NARCIS (Netherlands)

    van Wietmarschen, Niek; Lansdorp, Peter M.

    2016-01-01

    Sister chromatid exchanges (SCEs) are considered sensitive indicators of genome instability. Detection of SCEs typically requires cells to incorporate bromodeoxyuridine (BrdU) during two rounds of DNA synthesis. Previous studies have suggested that SCEs are induced by DNA replication over BrdU-subst

  4. Flow cytometric measurement of RNA synthesis using bromouridine labelling and bromodeoxyuridine antibodies

    DEFF Research Database (Denmark)

    Jensen, P O; Larsen, J; Christiansen, J;

    1993-01-01

    Nuclear RNA synthesis can be analysed by flow cytometry of cells labelled with 5-bromouridine (BrUrd) and stained with anti-bromodeoxyuridine (BrdUrd) antibody and FITC-conjugated secondary antibody. A panel of 5 different commercially available anti-BrdUrd antibodies was tested on cells of a HL-...... the variation of RNA synthesis during the cell cycle. The BrUrd incorporation was high in the S and G2 phase, variable in G1, and negligible in mitosis. Similar results were obtained using other cell types....

  5. Double labelling of tissue combining tritiated thymidine autoradiography with immunodetection of bromodeoxyuridine: the autoradiographic significance of inhibition of thymidine incorporation into DNA by bromodeoxyuridine given simultaneously

    Energy Technology Data Exchange (ETDEWEB)

    Hume, W.J.; Thompson, J. (Leeds Univ. (UK). School of Dentistry)

    1989-09-01

    The authors describe a method for combining tritiated thymidine (({sup 3}H)TdR) autoradiography with immunoperoxidase detection of bromodeoxyuridine (BrdU) in paraffin-embedded tissues, which was used to examine, in mouse tongue epithelium, the inhibition of incorporation into DNA of ({sup 3}H)TdR by simultaneous injection of BrdU in the doses that both compounds are likely to be used in cell proliferation studies. The inhibition of uptake into DNA of ({sup 3}H)TdR from 0.23 to 1.85 MBq (6.25 to 50 {mu}Ci) per animal, produced by a simultaneous injection of 2.5 mg BrdU shows a linear, dose-dependent relationship. Provided the injected dose (in {mu}Ci per animal) multiplied by the autoradiographic exposure time (in days) is greater than a value of 700, then all cells that are labelled after incorporation of ({sup 3}H)TdR alone are also labelled after simultaneous double labelling, despite the latter producing a lower average grain count. (author).

  6. Bromodeoxyuridine does not contribute to sister chromatid exchange events in normal or Bloom syndrome cells.

    Science.gov (United States)

    van Wietmarschen, Niek; Lansdorp, Peter M

    2016-08-19

    Sister chromatid exchanges (SCEs) are considered sensitive indicators of genome instability. Detection of SCEs typically requires cells to incorporate bromodeoxyuridine (BrdU) during two rounds of DNA synthesis. Previous studies have suggested that SCEs are induced by DNA replication over BrdU-substituted DNA and that BrdU incorporation alone could be responsible for the high number of SCE events observed in cells from patients with Bloom syndrome (BS), a rare genetic disorder characterized by marked genome instability and high SCE frequency. Here we show using Strand-seq, a single cell DNA template strand sequencing technique, that the presence of variable BrdU concentrations in the cell culture medium and in DNA template strands has no effect on SCE frequency in either normal or BS cells. We conclude that BrdU does not induce SCEs and that SCEs detected in either normal or BS cells reflect DNA repair events that occur spontaneously.

  7. RNA amplification of bromodeoxyuridine labeled newborn neurons in the monkey hippocampus.

    Science.gov (United States)

    Counts, Scott E; Chen, Er-Yun; Ginsberg, Stephen D; Kordower, Jeffrey H; Mufson, Elliott J

    2005-06-15

    Neurogenesis has been demonstrated in the adult mammalian hippocampus by the immunohistochemical identification of cells co-labeled with the neuronal marker NeuN and bromodeoxyuridine (BrdU), a marker for DNA synthesis. Whether these newly born neurons exhibit a genetic signature similar to that of existing hippocampal cells remains unknown. Recent advances in single cell RNA amplification techniques provide a unique method for profiling the mRNA complement of cells developed during adult neurogenesis. Standard protocols for identifying BrdU-positive cells requires an acid denaturation step that may preclude the amplification of cellular RNA for expression analysis. We first tested whether the BrdU reaction product was visible in monkey hippocampal tissue following treatment with dilutions of HCl (2-0.2 M) or citric acid (1.0-0.1 M). BrdU-labeled cells were visible only in tissue sections treated with 2 M HCl. RNA amplification was not compromised in cells dual-labeled for BrdU and NeuN using the 2 M HCl acid denaturation step. These cells express mRNAs encoding a wide variety of functional protein subclasses including glutamate receptors. The present study demonstrates for the first time that BrdU immunohistochemisty is compatable with gene array technology in the primate hippocampus to evaluate subclasses of genes in newborn neurons.

  8. Attempts to induce mutations in Haemophilus influenzae with the base analogues 5-bromodeoxyuridine and 2-aminopurine

    Energy Technology Data Exchange (ETDEWEB)

    Kimball, R.F.; Perdue, S.W.

    1977-01-01

    Attempts were made to induce mutations in Haemophilus influenzae with the base analogues 5-bromodeoxyuridine and 2-aminopurine. These attempts were unsuccessful. Incorporation studies with BrdUrd showed, in agreement with earlier studies on Escherichia coli, that BrdUrd was discriminated against when dThd was also present but was incorporated to essentially the same extent as dThd when only BrdUrd was present. In this latter case, strands fully substituted with BrdUrd were produced, but survival data suggest that bacteria deriving their DNA by replication on such fully substituted templates were inviable. However, bacteria with about 20% of the thymine substituted with bromouracil were usually viable. No mutations could be detected in the descendants of such bacteria. The reasons for this are discussed and it is concluded that in all probability the replication system in species rarely if ever treats incorporated bromouracil as anything except a thymine analogue. The alternative possibility, that the negative results are a consequence of the absence of the reclex (SOS) error-prone repair system in this species, is considered much less likely.

  9. Use of bromodeoxyuridine immunocapture to identify psychrotolerant phenanthrene-degrading bacteria in phenanthrene-enriched polluted Baltic Sea sediments

    Energy Technology Data Exchange (ETDEWEB)

    Edlund, A.; Jansson, J.

    2008-05-01

    The aim of this study was to enrich and identify psychrotolerant phenanthrenedegrading bacteria from polluted Baltic Sea sediments. Polyaromatic hydrocarbon (PAH)-contaminated sediments were spiked with phenanthrene and incubated for 2 months in the presence of bromodeoxyuridine that is incorporated into the DNA of replicating cells. The bromodeoxyuridine-incorporated DNA was extracted by immunocapture and analyzed by terminal-restriction fragment length polymorphism and 16S rRNA gene cloning and sequencing to identify bacterial populations that were growing. In addition, degradation genes were quantified in the bromodeoxyuridine-incorporated DNA by real-time PCR. Phenanthrene concentrations decreased after 2 months of incubation in the phenanthrene-enriched sediments and this reduction correlated to increases in copy numbers of xylE and phnAc dioxygenase genes. Representatives of Exiguobacterium, Schewanella,Methylomonas, Pseudomonas, Bacteroides and an uncultured Deltaproteobacterium and a Gammaproteobacterium dominated the growing community in the phenanthrene spiked sediments. Isolates that were closely related to three of these bacteria (two pseudomonads and an Exiguobacterium sp.) could reduce phenanthrene concentrations in pure cultures and they all harbored phnAc dioxygenase genes. These results confirm that this combination of culture-based and molecular approaches was useful for identification of actively growing bacterial species with a high potential for phenanthrene degradation.

  10. Endogenous type C viral gene expression in cultures of fetal diploid baboon cells treated with 5'-bromodeoxyuridine

    Energy Technology Data Exchange (ETDEWEB)

    Lavelle, G.; Kennel, S.J.; Foote, L.J.

    1981-04-30

    Cultures of fetal diploid baboon fibroblasts treated with 5-bromodeoxyuridine synthesized protein antigenically related to baboon endogenous type C viral gag gene product, p28. Radioimmunoassays detected p28 antigenic specificities indistinguishable from those of purified virus. However, viral RNA-dependent DNA polymerase was not detected in culture fluids, and infectious virus was rarely recovered by cocultivation with susceptible heterologous cells. Extracellular particles containing p28 were not readily detected, further indicating that viral gag gene-coded proteins were synthesized independently of whole virus. Normal cultures of the same baboon cells exhibited endogenous expression of a glycoprotein antigenically related to BEV gp70, suggesting differential regulation of the endogenous gag and env gene-coded products. Baboon cell cultures exogenously infected with BEV produced extracellular particles having viral p28 and gp70 as measured by radioimmunoassays of culture fluids. Since induced cultures have about 10% positive cells versus close to 100% for infected culture, the amount of p28 per producing cell was about the same in both cell populations.

  11. Isolation by restriction endonuclease digestion and base-specific affinity chromatography of rat-embryo DNA sequences disproportionately enriched in virogenic bromodeoxyuridine.

    Science.gov (United States)

    Schwartz, S A

    1981-02-01

    Control and bromodeoxyuridine-containing rat-embryo-cell DNA were digested by the restriction endonucleases Hpa II and Msp I and were subsequently analyzed by agarose-gel electrophoresis as well as DNA-affinity chromatography. By the former technique, it appeared that no substantial differences existed between the two DNA samples with respect to the amount or distribution of methylcytosine. On the other hand, it was obvious following base-specific DNA chromatography that the virogenic analog was markedly concentrated in particular nucleotide sequences which demonstrated a proportionately greater affinity for the (A-T)-specific adsorbent irrespective of digestion by either restriction endonuclease.

  12. The Fingerprint of Anti-Bromodeoxyuridine Antibodies and Its Use for the Assessment of Their Affinity to 5-Bromo-2'-Deoxyuridine in Cellular DNA under Various Conditions

    Science.gov (United States)

    Ligasová, Anna; Liboska, Radek; Rosenberg, Ivan; Koberna, Karel

    2015-01-01

    We have developed a simple system for the analysis of the affinity of anti-bromodeoxyuridine antibodies. The system is based on the anchored oligonucleotides containing 5-bromo-2'-deoxyuridine (BrdU) at three different positions. It allows a reliable estimation of the reactivity of particular clones of monoclonal anti-bromodeoxyuridine antibodies with BrdU in fixed and permeabilized cells. Using oligonucleotide probes and four different protocols for the detection of BrdU incorporated in cellular DNA, we identified two antibody clones that evinced sufficient reactivity to BrdU in all the tested protocols. One of these clones exhibited higher reactivity to 5-iodo-2'-deoxyuridine (IdU) than to BrdU. It allowed us to increase the sensitivity of the used protocols without a negative effect on the cell physiology as the cytotoxicity of IdU was comparable with BrdU and negligible when compared to 5-ethynyl-2'-deoxyuridine. The combination of IdU and the improved protocol for oxidative degradation of DNA provided a sensitive and reliable approach for the situations when the low degradation of DNA and high BrdU signal is a priority. PMID:26161977

  13. A reproducible technique combining tritiated thymidine autoradiography with immunodetection of bromodeoxyuridine for double labelling studies of cell proliferation in paraffin sections of tissues.

    Science.gov (United States)

    Hume, W J

    1990-05-01

    A method is described to combine tritiated thymidine autoradiography with immunoperoxidase detection of bromodeoxyuridine on the same paraffin sections. It overcomes the varied technical artefacts we encountered when first attempting to combine these techniques and results in preparations with extremely low peroxidase and autoradiographic backgrounds. In particular, we find it is important to avoid the use of detergents during immunostaining, otherwise grain counts are reduced and autoradiograph exposures need to be greatly increased, and to avoid excessive peroxidase staining which makes it difficult to visualize silver grains in the overlying emulsion. The advantages of a method to remove emulsion films using acid-alcohol, allowing the same sections to be dipped twice with a long and a short autoradiographic exposure, are presented. The routine combination of high quality tritiated thymidine autoradiography with clean immunoperoxidase staining of bromodeoxyuridine-positive nuclei provides a new and powerful cell kinetic, double-labelling method to augment existing techniques e.g. by labelling the same cells undergoing DNA synthesis in successive cell cycles.

  14. The Fingerprint of Anti-Bromodeoxyuridine Antibodies and Its Use for the Assessment of Their Affinity to 5-Bromo-2'-Deoxyuridine in Cellular DNA under Various Conditions.

    Directory of Open Access Journals (Sweden)

    Anna Ligasová

    Full Text Available We have developed a simple system for the analysis of the affinity of anti-bromodeoxyuridine antibodies. The system is based on the anchored oligonucleotides containing 5-bromo-2'-deoxyuridine (BrdU at three different positions. It allows a reliable estimation of the reactivity of particular clones of monoclonal anti-bromodeoxyuridine antibodies with BrdU in fixed and permeabilized cells. Using oligonucleotide probes and four different protocols for the detection of BrdU incorporated in cellular DNA, we identified two antibody clones that evinced sufficient reactivity to BrdU in all the tested protocols. One of these clones exhibited higher reactivity to 5-iodo-2'-deoxyuridine (IdU than to BrdU. It allowed us to increase the sensitivity of the used protocols without a negative effect on the cell physiology as the cytotoxicity of IdU was comparable with BrdU and negligible when compared to 5-ethynyl-2'-deoxyuridine. The combination of IdU and the improved protocol for oxidative degradation of DNA provided a sensitive and reliable approach for the situations when the low degradation of DNA and high BrdU signal is a priority.

  15. A comparative analysis of intraperitoneal versus intracerebroventricular administration of bromodeoxyuridine for the study of cell proliferation in the adult rat brain.

    Science.gov (United States)

    Cifuentes, M; Pérez-Martín, M; Grondona, J M; López-Ávalos, M D; Inagaki, N; Granados-Durán, P; Rivera, P; Fernández-Llebrez, P

    2011-10-15

    Bromodeoxyuridine (BrdU) is the most widely used marker to detect proliferative cells in the adult brain. Here we analyse whether the route of administration of the tracer influences the number of labelled cells. For the intraperitoneal (ip) administration of BrdU, we performed two daily injections during 7 days, and for an intracerebroventricular (icv) delivery, it was continuously infused into one lateral ventricle for a 7 days period as well. After ip administration, cells labelled with BrdU were seen in the subventricular zone of the striatal wall of the lateral ventricle, the hippocampus and the neurohemal circumventricular organs. Also, the habenula and large myelinated tracts, such as the fornix and the corpus callosum, showed many BrdU-positive nuclei. Labelled nuclei were scarce in the parenchymal regions of the rest of the brain. In contrast, a significant increase in the number of BrdU-positive nuclei was observed in the parenchyma of the periventricular zones after icv administration of the marker, thus showing a greater availability of the tracer when it was administered directly into the ventricular cerebrospinal fluid. We suggest that the availability of BrdU in the vicinity of proliferating cells may depend on the permeability of the brain vessels to nucleosides in each location. By using double immunocytochemistry we found that neurons, astrocytes, oligodendrocytes, tanycytes and microglia had incorporated the tracer, demonstrating their proliferation capacity.

  16. LAT, EGFR -pY197, PCNL2, CDX2, HLA-DPDQDR, bromodeoxyuridine, JAM-A, and ezrin immunoreactants in a rubbed spongiotic dermatitis

    Directory of Open Access Journals (Sweden)

    Ana Maria Abreu Velez

    2011-10-01

    Full Text Available Background: Acute and subacute spongiotic dermatitides are among the most commonly diagnosed types of dermatitis. Many patients rub their lesions, with the lesions becoming clinically thickened. The precise immunologic mechanisms within the thickening process are not well defined. Case report: An 85 year old male presented with the sudden clinical appearance of erythematous patches and small blisters on the back of his legs, with pruritis. Methods: Skin biopsies, one from a rubbed lesion and one from a non-rubbed lesion were submitted for hematoxylin and eosin (H&E, immunohistochemistry (IHC, and for direct immunofluorescence (DIF analysis. Results: The H&E staining demonstrated classic features of a spongiotic dermatitis, but in the rubbed areas psoriasiform hyperplasia was also seen. The psoriasiform areas demonstrated positive, focal IHC staining with bromodeoxyuridine, LAT, EGFR-pY197, PCNL2, CDX2, and HLA-DPDQDR antibodies. DIF staining revealed positive staining of JAM-A and ezrin in the non-rubbed specimens in both the spongiotic epidermis and in the adjacent vessels; normal expression of these markers was appreciated in the rubbed biopsy. Conclusions: The immune response seems to be complex when a spongiotic dermatitis is converted from a non-rubbed to a rubbed lesion with histologic features of psoriasiform hyperplasia.

  17. A new method for in vitro detection of bromodeoxyuridine in serum: a proof of concept in a songbird species, the canary.

    Directory of Open Access Journals (Sweden)

    Jennifer M Barker

    Full Text Available Systemic injection of a thymidine analogue such as bromodeoxyuridine (BrdU in vertebrates is commonly used to detect and study cell production during development, adulthood, and pathology, particularly in studies of adult neurogenesis. Although researchers are applying this technique to multiple species in various physiological conditions, the rate of BrdU clearance from the serum remains unknown in most cases. Changes in this clearance rate as a function of the species, sex or endocrine condition could however profoundly affect the interpretation of the results. We describe a rapid, sensitive, but simple bioassay for post-injection detection and quantification of BrdU in serum. This procedure was shown to be suitable for determining the length of time a thymidine analogue remains in the bloodstream of one avian species and seems applicable to any vertebrate provided sufficiently large blood samples can be collected. This technique was used to demonstrate that, in canaries, BrdU injected at a dose of 100 mg/kg is no longer available for incorporation into DNA between 30 and 60 min post-injection, a delay shorter than anticipated based on the available literature. Preliminary data suggest a similar fast clearance in Japanese quail and mice.

  18. Proliferation of granulosa and thecal cells in germinal disc and non-disc regions during follicular growth in Japanese quail (Coturnix coturnix japonica): bromodeoxyuridine incorporation in situ.

    Science.gov (United States)

    Yoshimura, Y; Okamoto, T; Tamura, T

    1996-05-01

    Proliferation of granulosa and thecal cells was analysed during ovarian follicular growth in laying Japanese quail. The birds were injected intraperitoneally with bromodeoxyuridine (BrdU) 10 or 4 h before ovulation, that is, before or after a preovulatory LH surge, respectively, and incorporation of BrdU by follicular tissues was detected immunocytochemically. Cells labelled with BrdU were seldom seen in the most immature follicles in the ovarian cortex, whereas many granulosa and thecal cells were labelled with BrdU in medium-sized white yolky follicles (approximately 13.3% and 14.4% in granulosa and theca layers, respectively). Ten and four hours before ovulation, the granulosa cells in the germinal disc and non-disc regions of the third largest yellow yolky follicle (F3) were labelled with BrdU (approximately 8.4% and 9.4% in germinal disc; 6.1% and 9.0% in the non-disc region), but only those in the germinal disc region were labelled (approximately 5.4% and 4.0%) in the largest yellow yolky follicle (F1). The percentage of thecal cells labelled with BrdU 4 h before ovulation was significantly higher than the percentage labelled 10 h before ovulation, and was higher in F3 (approximately 11.7%) than in F1 follicles (approximately 5.4%) 4 h before ovulation. These results show that proliferation of granulosa and thecal cells occurs in both germinal disc and non-disc regions in growing follicles, but when a follicle matures proliferation is reduced and in the case of granulosa cells it is restricted to the germinal disc region.

  19. Different patterns of glycolipid antigens are expressed following differentiation of TERA-2 human embryonal carcinoma cells induced by retinoic acid, hexamethylene bisacetamide (HMBA) or bromodeoxyuridine (BUdR).

    Science.gov (United States)

    Andrews, P W; Nudelman, E; Hakomori, S; Fenderson, B A

    1990-04-01

    NTERA-2 cl.D1 human embryonal carcinoma (EC) cells were induced to differentiate by either bromodeoxyuridine (BUdR) or hexamethylene bisacetamide (HMBA), and also by retinoic acid. Following exposure to each of these inducers, the globoseries glycolipid antigens stage-specific embryonic antigens -3 and -4 (SSEA-3 and -4) and the glycoprotein antigen TRA-1-60, all characteristic of the human EC cell surface, underwent a marked reduction in expression within about 7 days. At the same time, the lactoseries glycolipid antigen SSEA-1, and ganglioseries antigens A2B5 (GT3) and ME311 (9-0-acetyl GD3) were induced in BUdR- and retinoic acid-treated cells. However, these antigens did not appear during the first 7-14 days of HMBA-induced differentiation. The observations of cell surface antigen expression were paralleled by analysis of glycolipids isolated from the cells by thin-layer chromatography. This analysis, in which the new monoclonal antibodies VINIS-56 and VIN-2PB-22 were included, also revealed expression of gangliosides GD3 and GD2 in all differentiated cultures, albeit at much lower levels following HMBA exposure than following retinoic acid or BUdR-exposure. Further, disialylparagloboside was detected in retinoic acid and BUdR-induced, but not HMBA-induced, cultures. Taken with morphological observations, the results suggest that HMBA induces differentiation of NTERA-2 cl.D1 EC cells along a pathway distinct from the pathway(s) induced by retinoic acid and BUdR.

  20. Utilisation de l'essai comete et du biomarqueur gamma-H2AX pour detecter les dommages induits a l'ADN cellulaire par le 5-bromodeoxyuridine post-irradiation

    Science.gov (United States)

    La Madeleine, Carole

    Ce memoire est presente a la Faculte de medecine et des sciences de la sante de l'Universite de Sherbrooke en vue de l'obtention du grade de maitre es sciences (M.Sc.) en radiobiologie (2009). Un jury a revise les informations contenues dans ce memoire. Il etait compose de professeurs de la Faculte de medecine et des sciences de la sante soit : Darel Hunting PhD, directeur de recherche (departement de medecine nucleaire et radiobiologie), Leon Sanche PhD, directeur de recherche (departement de medecine nucleaire et radiobiologie), Richard Wagner PhD, membre du programme (departement de medecine nucleaire et radiobiologie) et Guylain Boissonneault PhD, membre exterieur au programme (departement de biochimie). Le 5-bromodeoxyuridine (BrdU), un analogue halogene de la thymidine reconnu depuis les annees 60 comme etant un excellent radiosensibilisateur. L'hypothese la plus repandue au sujet de l'effet radio sensibilisant du BrdU est qu'il augmente le nombre de cassures simple et double brin lorsqu'il est incorpore dans l'ADN de la cellule et expose aux radiations ionisantes. Toutefois, de nouvelles recherches semblent remettre en question les observations precedentes. Ces dernieres etudes ont confirme que le BrdU est un bon radiosensibilisateur, car il augmente les dommages radio-induits dans l'ADN. Mais, c'est en etant incorpore dans une region simple brin que le BrdU radiosensibilise l'ADN. Ces recherches ont egalement revele pour la premiere fois un nouveau type de dommages produits lors de l'irradiation de l'ADN contenant du BrdU : les dimeres interbrins. Le but de ces travaux de recherche est de determiner si la presence de bromodeoxyuridine dans l'ADN augmente l'induction de bris simple et / ou double brin chez les cellules irradiees en utilisant de nouvelles techniques plus sensibles et specifiques que celles utilisees auparavant. Pour ce faire, les essais cometes et la detection des foci H2AX phosphorylee pourraient permettre d'etablir les effets engendres par

  1. Gene expression analysis of livers from female B6C3F1 mice exposed to carcinogenic and non-carcinogenic doses of furan, with or without bromodeoxyuridine (BrdU treatment

    Directory of Open Access Journals (Sweden)

    Anna Francina Webster

    2014-12-01

    Full Text Available Standard methodology for identifying chemical carcinogens is both time-consuming and resource intensive. Researchers are actively investigating how new technologies can be used to identify chemical carcinogens in a more rapid and cost-effective manner. Here we performed a toxicogenomic case study of the liver carcinogen furan. Full study and mode of action details were previously published in the Journal of Toxicology and Applied Pharmacology. Female B6C3F1 mice were sub-chronically treated with two non-carcinogenic (1 and 2 mg/kg bw and two carcinogenic (4 and 8 mg/kg bw doses of furan for 21 days. Half of the mice in each dose group were also treated with 0.02% bromodeoxyuridine (BrdU for five days prior to sacrifice [13]. Agilent gene expression microarrays were used to measure changes in liver gene and long non-coding RNA expression (published in Toxicological Sciences. Here we describe the experimental and quality control details for the microarray data. We also provide the R code used to analyze the raw data files, produce fold change and false discovery rate (FDR adjusted p values for each gene, and construct hierarchical clustering between datasets.

  2. Gene expression analysis of livers from female B6C3F1 mice exposed to carcinogenic and non-carcinogenic doses of furan, with or without bromodeoxyuridine (BrdU) treatment.

    Science.gov (United States)

    Webster, Anna Francina; Williams, Andrew; Recio, Leslie; Yauk, Carole L

    2014-12-01

    Standard methodology for identifying chemical carcinogens is both time-consuming and resource intensive. Researchers are actively investigating how new technologies can be used to identify chemical carcinogens in a more rapid and cost-effective manner. Here we performed a toxicogenomic case study of the liver carcinogen furan. Full study and mode of action details were previously published in the Journal of Toxicology and Applied Pharmacology. Female B6C3F1 mice were sub-chronically treated with two non-carcinogenic (1 and 2 mg/kg bw) and two carcinogenic (4 and 8 mg/kg bw) doses of furan for 21 days. Half of the mice in each dose group were also treated with 0.02% bromodeoxyuridine (BrdU) for five days prior to sacrifice [13]. Agilent gene expression microarrays were used to measure changes in liver gene and long non-coding RNA expression (published in Toxicological Sciences). Here we describe the experimental and quality control details for the microarray data. We also provide the R code used to analyze the raw data files, produce fold change and false discovery rate (FDR) adjusted p values for each gene, and construct hierarchical clustering between datasets.

  3. Hoechst fluorescence intensity can be used to separate viable bromodeoxyuridine-labeled cells from viable non-bromodeoxyuridine-labeled cells

    Science.gov (United States)

    Mozdziak, P. E.; Pulvermacher, P. M.; Schultz, E.; Schell, K.

    2000-01-01

    BACKGROUND: 5-Bromo-2'-deoxyuridine (BrdU) is a powerful compound to study the mitotic activity of a cell. Most techniques that identify BrdU-labeled cells require conditions that kill the cells. However, the fluorescence intensity of the membrane-permeable Hoechst dyes is reduced by the incorporation of BrdU into DNA, allowing the separation of viable BrdU positive (BrdU+) cells from viable BrdU negative (BrdU-) cells. METHODS: Cultures of proliferating cells were supplemented with BrdU for 48 h and other cultures of proliferating cells were maintained without BrdU. Mixtures of viable BrdU+ and viable BrdU- cells from the two proliferating cultures were stained with Hoechst 33342. The viable BrdU+ and BrdU- cells were sorted into different fractions from a mixture of BrdU+ and BrdU- cells based on Hoechst fluorescence intensity and the ability to exclude the vital dye, propidium iodide. Subsequently, samples from the original mixture, the sorted BrdU+ cell population, and the sorted BrdU- cell population were immunostained using an anti-BrdU monoclonal antibody and evaluated using flow cytometry. RESULTS: Two mixtures consisting of approximately 55% and 69% BrdU+ cells were sorted into fractions consisting of greater than 93% BrdU+ cells and 92% BrdU- cells. The separated cell populations were maintained in vitro after sorting to demonstrate their viability. CONCLUSIONS: Hoechst fluorescence intensity in combination with cell sorting is an effective tool to separate viable BrdU+ from viable BrdU- cells for further study. The separated cell populations were maintained in vitro after sorting to demonstrate their viability. Copyright 2000 Wiley-Liss, Inc.

  4. Evaluation of the radiosensitizing to treatment with {sup 153}Sm-EDTMP, of haematopoietic cells of the bone marrow by means of bromodeoxyuridine incorporation into DNA, in a murine model; Evaluacion de la radiosensibilizacion al tratamiento con {sup 153}Sm-EDTMP, de las celulas hemotopoyeticas de la medula osea mediante la incorporacion de bromodesoxiuridina (BrdU) en el ADN, en un modelo murino

    Energy Technology Data Exchange (ETDEWEB)

    Morales A, E.

    2008-07-01

    Bromodeoxyuridine (BrdU) has been shown to have a radiosensitizing effect, and its incorporation into DNA prior to administration of a bone-seeking radiopharmaceutical could increase the efficiency of bone marrow ablation, and even increase the specificity of radiation exposure for therapeutic purposes. The aim of the present study was to determine the effect of BrdU incorporation into DNA on the genotoxic and cytotoxic effects of samarium-153 ethylenediaminetetra-methylene phosphonate ({sup 153}Sm-EDTMP) in murine bone marrow cells. BALB/c male mice (N = 5 in each experiment) were treated with one of the following substances: a) BrdU (0.25 mg/g) b) {sup 153}-EDTMP (11.5 +- 3 MBq) c) BrdU (0.25 mg/g) plus {sup 153}Sm-EDTMP (11.5 +- MBq), there was also an untreated control. Cytotoxicity and genotoxicity were established by time-response and absorbed dose-response curves of polychromatic erythrocyte (PCE) and micro nucleated polychromatic erythrocyte (MN-PCE) frequencies, respectively, in murine peripheral blood samples in vivo. The significance of the differences between groups was determined by a variation of Dunett test for multiple groups and different-sized groups of a student test. Beta-absorbed dose fractions obtained from MNCP4B Monte Carlo computer code were used for mice bone marrow dosimetry calculations. At an average radiation absorbed dose of 0.38 Gy, 0.56 Gy and 0.82 Gy at 24, 40 and 72 h respectively, cells from animals treated with {sup 153}Sm-EDTMP showed a clear and significant induction of MN-PCE after 24 h, with the maximum response at 40 h, however, cells from group treated with BrdU plus {sup 153}Sm-EDTMP paradoxically showed MN-PCE frequencies only slightly higher than the control at the same absorbed dose. Treatment with {sup 153}Sm-EDTMP caused a slight reduction in PCE frequency, but exposure to BrdU or BrdU plus {sup 153}Sm-EDTMP induced a substantial and significant reduction in PCE frequency from 32 h to the end of the experiment (72 h

  5. Influence of incorporated bromodeoxyuridine on the induction of chromosomal alterations by ionizing radiation and long-wave UV in CHO cells.

    Science.gov (United States)

    Zwanenburg, T S; van Zeeland, A A; Natarajan, A T

    1985-01-01

    Incorporation of BrdUrd into nuclear DNA sensitizes CHO cells (1) to the induction of chromosomal aberrations by X-rays and 0.5 MeV neutrons and (2) to induction of chromosomal aberrations and SCEs by lw-UV. We have attempted to establish a correlation between induced chromosomal alterations and induced single- or double-strand breaks in DNA. The data show that while DSBs correlate very well with X-ray-induced aberrations, no clear correlation could be established between lw-UV induced SSBs (including alkali-labile sites) and chromosomal alterations. In addition the effect of 3-aminobenzamide (3AB) on the induction of chromosomal aberrations and SCEs induced by lw-UV has been determined. It is shown that 3AB is without any effect when lw-UV-irradiated cells are posttreated with this inhibitor. The significance of these results is discussed.

  6. E-cadherin expression and bromodeoxyuridine incorporation during development of ovarian inclusion cysts in age-matched breeder and incessantly ovulated CD-1 mice

    Directory of Open Access Journals (Sweden)

    Beaugié Clare R

    2007-04-01

    Full Text Available Abstract Background Female CD-1/Swiss Webster mice subjected to incessant ovulation for 8 months and 12-month breeder mice both developed ovarian inclusion cysts similar to serous cystadenomas. The majority of cysts appeared to be dilated rete ovarii tubules, but high ovulation number resulted in more cortical inclusion cysts. We hypothesized that comparison of inclusion cyst pathology in animals of the same age, but with differences in total lifetime ovulation number, might allow us to determine distinguishing characteristics of the two types of cyst. Methods Ovaries from breeder mice (BR or females subjected to incessant ovulation (IO were compared at 6-, 9- and 12-months of age. Ovaries were serially sectioned and cysts characterized with regard to location and histology, E-cadherin immunoreactivity and rates of BrdU incorporation. Results Inclusion cysts developed with age in BR and IO ovaries. The majority of cysts were connected to the ovarian hilus. Two cortical inclusion cysts were observed in ten IO ovaries and one in ten BR ovaries. Low or no E-cadherin immuno-staining was seen in the OSE of all mice studied. Conversely, strong membrane immuno-staining was observed in rete ovarii epithelial cells. Variable E-cadherin immunoreactivity was seen in cells of hilar inclusion cysts, with strong staining observed in cuboidal ciliated cells and little or no staining in flat epithelial cells. Two of the three cortical cysts contained papillae, which showed E-cadherin immuno-staining at the edge of cells. However hilar and cortical cysts were not distinguishable by morphology, cell type or E-cadherin immunoreactivity. BrdU incorporation in cyst cells (1.4% [95% CI: 1.0 to 2.1] was greater than in OSE (0.7% [95% CI: 0.4 to 1.2] and very few BrdU-labeled cells were observed in rete ovarii at any age. Incessant ovulation significantly increased BrdU incorporation in OSE of older animals. Conclusion These experiments confirm ovarian inclusion cysts develop with age in the CD-1 mouse strain, irrespective of total ovulation burden. We conclude longer periods of incessant ovulation do not lead to significant changes in inclusion cyst formation or steroidogenesis in CD-1 mice and inclusion cyst type can not be distinguished by morphology, cell proliferation rate or E-cadherin immunoreactivity.

  7. Cortical neurogenesis in adult rats after ischemic brain injury:most new neurons fail to mature

    Institute of Scientific and Technical Information of China (English)

    Qing-quan Li; Guan-qun Qiao; Jun Ma; Hong-wei Fan; Ying-bin Li

    2015-01-01

    The present study examines the hypothesis that endogenous neural progenitor cells isolated from the neocortex of ischemic brain can differentiate into neurons or glial cells and contribute to neural regeneration. We performed middle cerebral artery occlusion to establish a model of cerebral ischemia/reperfusion injury in adult rats. Immunohistochemical staining of the cortex 1, 3, 7, 14 or 28 days after injury revealed that neural progenitor cells double-positive for nestin and sox-2 appeared in the injured cortex 1 and 3 days post-injury, and were also positive for glial ifbrillary acidic protein. New neurons were labeled using bromodeoxyuridine and different stages of maturity were identiifed using doublecortin, microtubule-associated protein 2 and neuronal nuclei antigen immunohistochemistry. Immature new neurons coexpressing doublecortin and bromodeoxyuridine were observed in the cortex at 3 and 7 days post-injury, and semi-mature and mature new neurons double-positive for microtubule-associated protein 2 and bromode-oxyuridine were found at 14 days post-injury. A few mature new neurons coexpressing neuronal nuclei antigen and bromodeoxyuridine were observed in the injured cortex 28 days post-injury. Glial ifbrillary acidic protein/bromodeoxyuridine double-positive astrocytes were also found in the injured cortex. Our ifndings suggest that neural progenitor cells are present in the damaged cortex of adult rats with cerebral ischemic brain injury, and that they differentiate into astrocytes and immature neurons, but most neurons fail to reach the mature stage.

  8. Running enhances neurogenesis, learning, and long-term potentiation in mice

    Science.gov (United States)

    van Praag, Henriette; Christie, Brian R.; Sejnowski, Terrence J.; Gage, Fred H.

    1999-01-01

    Running increases neurogenesis in the dentate gyrus of the hippocampus, a brain structure that is important for memory function. Consequently, spatial learning and long-term potentiation (LTP) were tested in groups of mice housed either with a running wheel (runners) or under standard conditions (controls). Mice were injected with bromodeoxyuridine to label dividing cells and trained in the Morris water maze. LTP was studied in the dentate gyrus and area CA1 in hippocampal slices from these mice. Running improved water maze performance, increased bromodeoxyuridine-positive cell numbers, and selectively enhanced dentate gyrus LTP. Our results indicate that physical activity can regulate hippocampal neurogenesis, synaptic plasticity, and learning. PMID:10557337

  9. Flow cytometric measurement of RNA synthesis based on bromouridine labelling and combined with measurement of DNA content or cell surface antigen

    DEFF Research Database (Denmark)

    Jensen, P O; Larsen, J; Larsen, J K

    1993-01-01

    RNA synthesis can be analysed in nuclei or cells labelled with 5-bromouridine (BrUrd) and stained using cross-reacting anti-bromodeoxyuridine (BrdUrd) antibody. Flow cytometric dual parameter analysis of BrUrd incorporation and DNA content in nuclear suspensions of human blood lymphocytes showed ...... in HL-60 and K-562 cells was measured simultaneous with CD13 expression....

  10. Tumour radiosensitization with the halogenated pyrimidines 5'-bromo-and 5'-iododeoxyuridine

    Energy Technology Data Exchange (ETDEWEB)

    Epstein, A.H.; Cook, J.A.; Goffman, T. (National Cancer Inst., Bethesda, MD (United States)); Glatstein, E. (Texas Univ., Dallas, TX (United States). Southwestern Medical Center)

    1993-02-01

    The authors review studies of the use of iododeoxyuridine (IdUrd) and bromodeoxyuridine as radiosensitizers and attempt to correlate the clinical outcome for patients treated with radiation and IdUrd with the extent of halogenated pyrimidine cellular uptake and incorporation. (U.K.).

  11. Use of lymphocyte cultures for BrdU replication banding patterns in anuran species (Amphibia

    Directory of Open Access Journals (Sweden)

    Kasahara Sanae

    1998-01-01

    Full Text Available We describe the standardization of lymphocyte culture procedures in order to improve cytological preparations of anuran species. This methodology permits the use of 5-bromodeoxyuridine (BrdU treatment to obtain replication banding patterns in the chromosomes of these species.

  12. MRI visualization of endogenous neural progenitor cell migration along the RMS in the adult mouse brain

    DEFF Research Database (Denmark)

    Vreys, Ruth; Vande Velde, Greetje; Krylychkina, Olga

    2010-01-01

    neurogenesis. Quantitative analysis of bromodeoxyuridine labeled cells revealed altered proliferation in the SVZ and NPC migration after in situ MPIO injection. From the labeling strategies presented in this report, intraventricular injection of a small number of MPIOs combined with the transfection agent poly...... the impact on adult neurogenesis when new in situ labeling strategies are developed....

  13. Effects of NOS inhibitor on dentate gyrus neurogenesis after diffuse brain injury in the adult rats

    Institute of Scientific and Technical Information of China (English)

    SunLi-Sha; XuJiang-ping

    2004-01-01

    Objective To investigate the effects of selective nitric oxide synthase (NOS) inhibitors on dentate gyrus neurogenesis after diffuse brain injury (DBI) in the adult rat brain. Methods Adult male SD rats were subjected to diffuse brain injury (DBI) model. By using systemic bromodeoxyuridine (BrdU) to label dividing cells, we compared the proliferation rate of

  14. The insulin-like growth factors I and II stimulate proliferation of different types of Schwann cells

    DEFF Research Database (Denmark)

    Sondell, M; Svenningsen, Åsa Fex; Kanje, M

    1997-01-01

    A combination of immunocytochemistry for glial specific antigens and bromodeoxyuridine (BrdU) and teasing was used to identify proliferating cells in cultured rat sciatic nerve segments. The nerve segments were exposed to insulin, or the insulin-like growth factors IGF-I and IGF-II. Teasing...

  15. Regulation of Schwann cell proliferation in cultured segments of the adult rat sciatic nerve

    DEFF Research Database (Denmark)

    Svenningsen, Åsa Fex; Kanje, M

    1998-01-01

    Schwann cell proliferation was studied in cultured segments of the rat sciatic nerve by measurement of [3H] thymidine incorporation or through bromodeoxyuridine-(BrdU)-labelling and immunocytochemistry. The aim was to delineate mechanisms involved in the injury-induced proliferative response...

  16. Estrogen and progesterone stimulate Schwann cell proliferation in a sex- and age-dependent manner

    DEFF Research Database (Denmark)

    Svenningsen, Åsa Fex; Kanje, M

    1999-01-01

    The effects of estrogen and progesterone on Schwann cell proliferation were studied in cultured segments of the rat sciatic nerve from adult male, female, and newborn rats, by measurement of [3H thymidine incorporation or bromo-deoxy-uridine- (BrdU)-labelling and immunocytochemistry. Estrogen (100...

  17. Coordinate reduction in cell proliferation and cell death in mouse olfactory epithelium from birth to maturity

    NARCIS (Netherlands)

    Fung, KM; Peringa, J; Venkatachalam, S; Lee, VMY; Trojanowski, JQ

    1997-01-01

    We investigated cell proliferation and cell death in the olfactory epithelium (OE) of mice from birth to maturity using bromodeoxyuridine and terminal deoxynucleotidyl transferase nick end labeling. We show that cell death events and proliferative activity diminish concomitantly with age in the OE.

  18. Postembryonic neurogenesis in the procerebrum of the terrestrial snail, Helix lucorum L

    Science.gov (United States)

    Zakharov, I. S.; Hayes, N. L.; Ierusalimsky, V. N.; Nowakowski, R. S.; Balaban, P. M.

    1998-01-01

    Neuronogenesis during posthatching development of the procerebrum of the terrestrial snail Helix lucorum was analyzed using bromodeoxyuridine immunohistochemistry to label proliferating cells. Comparison of the distribution of labeled cells in a series of animals which differed in age at the time of incubation with bromodeoxyuridine, in survival time after incubation, and in age at sacrifice reveals a clear pattern and developmental sequence in neuron origin. First, the proliferating cells are located only at the apical portion of the procerebrum. Second, cells which are produced at any particular age remain, for the most part, confined to a single layer in the procerebrum. Third, as development proceeds, each layer of previously produced neurons is displaced toward the basal part of the procerebrum by the production of additional neurons. Our results suggest that the vast majority of the neurons (probably about 70-80%) of the snail procerebrum are produced during the first 1-2 months of posthatching development.

  19. Intracerebroventricular Administration of Nerve Growth Factor Induces Gliogenesis in Sensory Ganglia, Dorsal Root, and within the Dorsal Root Entry Zone

    OpenAIRE

    Schlachetzki, Johannes C.M.; Pizzo, Donald P.; Debbi A. Morrissette; Jürgen Winkler

    2015-01-01

    Previous studies indicated that intracerebroventricular administration of nerve growth factor (NGF) leads to massive Schwann cell hyperplasia surrounding the medulla oblongata and spinal cord. This study was designed to characterize the proliferation of peripheral glial cells, that is, Schwann and satellite cells, in the trigeminal ganglia and dorsal root ganglia (DRG) of adult rats during two weeks of NGF infusion using bromodeoxyuridine (BrdU) to label dividing cells. The trigeminal ganglia...

  20. Cerebrolysin enhances neurogenesis in the ischemic brain and improves functional outcome after stroke

    OpenAIRE

    Zhang, Chunling; Chopp, Michael; Cui, Yisheng; Wang, Lei; Zhang, Ruilan; Li ZHANG; Lu, Mei; Szalad, Alexandra; Doppler, Edith; Hitzl, Monika; Zhang, Zheng Gang

    2010-01-01

    Cerebrolysin is a peptide preparation mimicking the action of neurotrophic factors and has beneficial effects on neurodegenerative diseases and stroke. The present study investigated the effect of Cerebrolysin on neurogenesis in a rat model of embolic middle cerebral artery occlusion (MCAo). Treatment with Cerebrolysin at doses of 2.5 and 5 ml/kg significantly increased the number of bromodeoxyuridine positive (BrdU+) subventricular zone (SVZ) neural progenitor cells and doublecortin (DCX) im...

  1. [Inhibition of invasion and multiplication of Toxoplasma gondii in human colonic epithelial cells by a monoclonal antibody against protein SAG2].

    Science.gov (United States)

    Osorio, J C; Sánchez, R M; Iraola, R C; Pérez, J S

    2001-01-01

    By an bromodeoxyuridine (BrdU) incorporation assay, it was proved hat an IgG 1 subclass, murine monoclonal antibody to surface protein SAG2 of Toxoplasma gondii is capable of reducing the invasion and multiplication of the parasites in highly differentiated mucine secretory HT29-18N2 line cells from a human colon adenocarcinoma. This result shows the importance of surface protein SAG2 of T.gondii in invasion and further multiplication of parasites in the host cell.

  2. Novel Preclinical Testing Strategies for Treatment of Metastatic Pheochromocytoma

    Science.gov (United States)

    2015-11-01

    and reagents The mouse pheochromocytoma cell line MTT was maintained in DMEM supplemented with 10% fetal bovine se- rum, 5% horse serum, and antibiotic ...testing all tumors was RPMI 1640 with 15% fetal bovine serum (“RPMI”). For some tumors, additional parallel testing was performed in High Glucose...cells were plated in RPMI 1640 medium with 15% fetal bovine serum. Proliferation was assessed by labeling with bromodeoxyuridine (BrdU) as a marker for

  3. Overcoming the Practical Barriers to Spinal Cord Cell Transplantation for ALS

    Science.gov (United States)

    2012-10-01

    proliferation marker bromodeoxyuridine (brdU; green) in vitro following 60 days in culture. Cell nuclei are counterstained with ethidium bromide (red) (B-G... remove virally inserted DNA after reprogramming. We attempted this with adult Yucatan minipig fibroblasts and keratinocytes. Amaxa Dermal Fibroblast...vertebrae overlying C3-C5 or L2-L4 segments are removed using rongeurs and a surgical drill. 5. Placement of the Spinal Derrick We call Spinal Derrick

  4. Analysis of {sup 76}Br-BrdU in DNA of brain tumors after a PET study does not support its use as a proliferation marker

    Energy Technology Data Exchange (ETDEWEB)

    Gudjonssona, Olafur E-mail: olafur.gudjonsson@neurokir.uu.se; Bergstroem, Mats; Kristjansson, Stefan; Wu, Feng; Nyberg, Gunnar; Fasth, Karl-Johan; Laangstroem, Bengt

    2001-01-01

    {sup 76}Br-bromodeoxyuridine has previously been suggested as a PET tracer to characterize proliferation potential. However, in animal studies a large fraction of the tissue radioactivity is due to {sup 76}Br-bromide, which remains extracellular for extensive periods and contributes significantly to the level of radioactivity. The present project aimed at investigating whether in human brain tumors, sufficient amounts of {sup 76}Br-bromodeoxyuridine would be incorporated into DNA, to motivate further attempts with this tracer. Eight patients with brain tumors: 3 meningiomas, 2 astrocytoma grade IV, 1 astrocytoma olicodendroglioma grade II-IV and 2 metastases, were examined with PET and {sup 76}Br-BrdU on three occasions: immediately after injection of the tracer, at 4-6, and at 18-20 hours after administration. After the first PET study, diuresis was introduced and maintained for about 12 hours. About 20 hours after tracer administration, 200 mg/m{sup 2} bromodeoxyuridine was administered to 7 patients median 5.8 (range 1-22) hours prior to operation allowing the immunohistochemical analysis of the proliferation potential. During the operation, tumor samples were taken and radioactivity in DNA extracted and measured. The uptake of radioactivity was higher in the tumors than in brain parenchyma. However, in the operative samples only 1-27% (average: 9%) of the radioactivity was found in the DNA fraction. The plasma radioactivity remained high throughout the study with only minimal signs of elimination by the diuresis. {sup 76}Br-BrdU is extensively metabolized to {sup 76}Br-bromide, and only a minor fraction of the radioactivity is found in the DNA fraction, making it unlikely that this tracer can be used for assessment of proliferation potential.

  5. The effect of suppressor of cytokine signaling 3 on GH signaling in beta-cells

    DEFF Research Database (Denmark)

    Rønn, Sif G; Hansen, Johnny A; Lindberg, Karen

    2002-01-01

    GH is an important regulator of cell growth and metabolism. In the pancreas, GH stimulates mitogenesis as well as insulin production in beta-cells. The cellular effects of GH are exerted mainly through activation of the Janus kinase-signal transducer and activator of transcription (STAT) pathway....... Furthermore, using Northern blot analysis it was shown that SOCS-3 can completely inhibit GH-induced insulin production in these cells. Finally, 5-bromodeoxyuridine incorporation followed by fluorescence-activated cell sorting analysis showed that SOCS-3 inhibits GH-induced proliferation of INS-1 cells...

  6. Transplantation of autologous bone marrow-derived mesenchymal stem cells for traumatic brain injury

    Institute of Scientific and Technical Information of China (English)

    Jindou Jiang; Xingyao Bu; Meng Liu; Peixun Cheng

    2012-01-01

    Results from the present study demonstrated that transplantation of autologous bone marrow-derived mesenchymal stem cells into the lesion site in rat brain significantly ameliorated brain tissue pathological changes and brain edema, attenuated glial cell proliferation, and increased brain-derived neurotrophic factor expression. In addition, the number of cells double-labeled for 5-bromodeoxyuridine/glial fibrillary acidic protein and cells expressing nestin increased. Finally, blood vessels were newly generated, and the rats exhibited improved motor and cognitive functions. These results suggested that transplantation of autologous bone marrow-derived mesenchymal stem cells promoted brain remodeling and improved neurological functions following traumatic brain injury.

  7. Mammalin cochlear supporting cells transdifferentiation into outer hair cells

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Objective To study the recovery of the outer hair cells in the bat cochlea after gentamicin exposure. Methods Bats were injected with a daily dose of gentamicin for 15 consecutive days and bromodeoxyuridine (BrdU) was given from day 16 to day 40 of this recovery phase. Hearing was assessed by overt acoustic behavior and auditory brainstem responses analysis, which was performed one day prior to the first injection and a day after the last injection (day 16). On day 40 animals were sacrificed for detection o...

  8. Monitoring DNA replication in fission yeast by incorporation of 5-ethynyl-2′-deoxyuridine

    OpenAIRE

    Hui Hua; Kearsey, Stephen E.

    2011-01-01

    We report procedures to allow incorporation and detection of 5-ethynyl-2'-deoxyuridine (EdU) in fission yeast, a thymidine analogue which has some technical advantages over use of bromode-oxyuridine. Low concentrations of EdU (1μM) are sufficient to allow detection of incorporation in cells expressing thymidine kinase and human equilibrative nucleoside transporter 1 (hENT1). However EdU is toxic and activates the rad3-dependent checkpoint, resulting in cell cycle arrest, potentially limiting ...

  9. Postnatal morphine administration alters hippocampal development in rats.

    Science.gov (United States)

    Traudt, Christopher M; Tkac, Ivan; Ennis, Kathleen M; Sutton, Leah M; Mammel, Daniel M; Rao, Raghavendra

    2012-01-01

    Morphine is frequently used as an analgesic and sedative in preterm infants. Adult rats exposed to morphine have an altered hippocampal neurochemical profile and decreased neurogenesis in the dentate gyrus of the hippocampus. To evaluate whether neonatal rats are similarly affected, rat pups were injected twice daily with 2 mg/kg morphine or normal saline from postnatal days 3 to 7. On postnatal day 8, the hippocampal neurochemical profile was determined using in vivo (1)H NMR spectroscopy. The mRNA and protein concentrations of specific analytes were measured in hippocampus, and cell division in dentate gyrus was assessed using bromodeoxyuridine. The concentrations of γ-aminobutyric acid (GABA), taurine, and myo-insotol were decreased, whereas concentrations of glutathione, phosphoethanolamine, and choline-containing compounds were increased in morphine-exposed rats relative to control rats. Morphine decreased glutamic acid decarboxylase enzyme levels and myelin basic protein mRNA expression in the hippocampus. Bromodeoxyuridine labeling in the dentate gyrus was decreased by 60-70% in morphine-exposed rats. These results suggest that recurrent morphine administration during brain development alters hippocampal structure.

  10. Catabolism of exogenously supplied thymidine to thymine and dihydrothymine by platelets in human peripheral blood

    Energy Technology Data Exchange (ETDEWEB)

    Pero, R.W.; Johnson, D.; Olsson, A.

    1984-11-01

    The interference of platelets with the estimation of unscheduled DNA synthesis in human peripheral mononuclear leukocytes following genotoxic exposure was studied. A 96% reduction in the unscheduled DNA synthesis value was achieved by incubating (/sup 3/H)thymidine with platelet-rich plasma for 5 hr at 37 degrees. Using radioactive thymine-containing compounds, together with quantitative analyses based on thin-layer and ion-exchange chromatographies, we have shown that thymidine was converted to thymine which, in turn, was converted to dihydrothymine in platelet-rich plasma. The enzymes responsible were separated from platelet lysates by gel filtration and were identified as thymidine phosphorylase and dihydrothymine dehydrogenase. The phosphorylase reversibly catalyzed the formation of thymine from thymidine and converted bromodeoxyuridine to bromouracil. The dehydrogenase reversibly catalyzed the interconversion of thymine and dihydrothymine in a reaction dependent on NADP(H), and it was inhibited by diazouracil and by thymine. Nearly all the thymidine-catabolizing activity found in whole blood samples supplied exogenously with thymidine was accounted for by the platelets. Since most genetic toxicological tests that use blood samples do not involve removing platelets from the blood cell cultures, then it is concluded that precautions should be taken in the future to determine the influence of platelets on these test systems. This is particularly true for methods dependent on thymidine pulses such as unscheduled DNA synthesis, or those dependent on bromodeoxyuridine, such as sister chromatid exchanges, since this nucleoside is also a substrate for thymidine phosphorylase.

  11. Effects of glucocorticoid and glucocorticoid receptors on stress-induced neurogenesis suppression

    Institute of Scientific and Technical Information of China (English)

    Xin Zhou; Jiapei Dai; Dan Liu; Shangxun Li; Yiwu Zhou

    2010-01-01

    Studies have shown that cerebral ischemia activates neurogenesis and that stress inhibits neurogenesis.However,the role of stress hormone levels on neurogenesis following cerebral ischemia remains poorly understood.The present study explored the possible regulatory mechanisms of adult neurogenesis under pathological conditions by examining changes and regulation of glucocorticoid receptors in adult rats subjected to transient unilateral middle cerebral artery suture occlusion.Corticosterone levels gradually increased following middle cerebral artery occlusion,and the number of glucocorticoid receptor-positive cells decreased.The number of5-bromodeoxyuridine-and nestin-positive cells significantly increased at 1 and 2 weeks after ischemia.A large number of doublecortin-positive cells migrated from the hippocampus to the cortex.At 3 weeks post-surgery,the number of 5-bromodeoxyuridine-and nestin-positive cells significantly reduced in the subventricular zone.Increased corticosterone levels decreased vascular endothelial cell proliferation and neurogenesis,and the number of glucocorticoid receptor-positive cells decreased.In the sham surgery group,vascular endothelial cell proliferation related to post-ischemic cerebral rehabilitation was not detected.Corticosterone levels increased,but the number and distribution of glucocorticoid receptor-positive cells were not changed.However,normal neuregenesis and migration of neural stem cells existed in the adult rat brain in the sham surgery group.Results suggested that glucocorticoid receptors influenced neurogenesis and were negatively regulated by glucocorticoid levels following focal cerebral ischemia and reperfusion.

  12. Effects of butternut squash extract on dentate gyrus cell proliferation and spatial learning in male adult rats

    Institute of Scientific and Technical Information of China (English)

    Mohsen Marzban; Sara Soleimani Asl; Hassan Fallah Huseini; Mahdi Tondar; Samira Choopani; Mehdi Mehdizadeh

    2011-01-01

    Previous studies reported that some plants, including butternut squash, exert positive effects on the brain. However, few studies have examined the effects of butternut squash on learning, memory, and neurogenesis. This study studied the effects of butternut squash extract on spatial learning and cell proliferation in the dentate gyrus of healthy male rats. Thirty-five male Wistar rats were intrap-eritoneally injected with 0, 50, 100, 200 and 400 mg/kg butternut squash extract once daily for 2 months. After the last administration, rat's spatial memory was studied using the Morris water maze. Finally, rats were sacrificed and hippocampal sections were prepared for light microscopy and bromodeoxyuridine immunohistochemistry studies. The results revealed that escape latency and swim distance decreased in all treatment groups compared with the control rats, and that the number of bromodeoxyuridine-positive cells in the dentate gyrus was significantly increased in the treatment groups compared with the controls. These findings suggest that butternut squash extract improves the learning and memory abilities of male rats, and increases the proliferation of dentate gyrus cells.

  13. P53 regulates disruption of neuronal development in the adult hippocampus after irradiation

    Science.gov (United States)

    Li, Y-Q; Cheng, ZW-C; Liu, SK-W; Aubert, I; Wong, C S

    2016-01-01

    Inhibition of hippocampal neurogenesis is implicated in neurocognitive dysfunction after cranial irradiation for brain tumors. How irradiation results in impaired neuronal development remains poorly understood. The Trp53 (p53) gene is known to regulate cellular DNA damage response after irradiation. Whether it has a role in disruption of late neuronal development remains unknown. Here we characterized the effects of p53 on neuronal development in adult mouse hippocampus after irradiation. Different bromodeoxyuridine incorporation paradigms and a transplantation study were used for cell fate mapping. Compared with wild-type mice, we observed profound inhibition of hippocampal neurogenesis after irradiation in mice deficient in p53 despite the absence of acute apoptosis of neuroblasts. The putative neural stem cells were apoptosis resistant after irradiation regardless of p53 genotype. Cell fate mapping using different bromodeoxyuridine incorporation paradigms revealed enhanced activation of neural stem cells and their consequential exhaustion in the absence of p53 after irradiation. Both p53-knockout and wild-type mice demonstrated similar extent of microglial activation in the hippocampus after irradiation. Impairment of neuronal differentiation of neural progenitors transplanted in irradiated hippocampus was not altered by p53 genotype of the recipient mice. We conclude that by inhibiting neural progenitor activation, p53 serves to mitigate disruption of neuronal development after irradiation independent of apoptosis and perturbation of the neural stem cell niche. These findings suggest for the first time that p53 may have a key role in late effects in brain after irradiation.

  14. Efficacy of Topical Mesenchymal Stem Cell Therapy in the Treatment of Experimental Dry Eye Syndrome Model

    Directory of Open Access Journals (Sweden)

    Emrullah Beyazyıldız

    2014-01-01

    Full Text Available Purpose. The current study was set out to address the therapeutic efficacy of topically applied mesenchymal stem cells (MSCs on dry eye syndrome (DES induced by benzalkonium chloride (BAC in rats. Methods. Rats were divided into two groups just after establishment of DES. Eye drops containing either bromodeoxyuridine labeled MSCs (n=9 or phosphate buffer solution (n=7 were topically applied once daily for one week. Schirmer test, break-up time score, ocular surface evaluation tests, and corneal inflammatory index scoring tests were applied to all rats at baseline and after treatment. All rats were sacrificed after one week for histological and electron microscopic analysis. Results. Mean aqueous tear volume and tear film stability were significantly increased in rats treated with MSCs (P<0.05. Infiltration of bromodeoxyuridine labeled MSCs into the meibomian glands and conjunctival epithelium was observed in MSCs treated rats. Increased number of secretory granules and number of goblet cells were observed in MSCs treated rats. Conclusion. Topical application of MSCs could be a safe and effective method for the treatment of DES and could potentially be used for further clinical research studies.

  15. Phosphoinositide-3-kinases p110alpha and p110beta mediate S phase entry in astroglial cells in the marginal zone of rat neocortex

    Directory of Open Access Journals (Sweden)

    Rabea eMüller

    2013-03-01

    Full Text Available In cells cultured from neocortex of newborn rats, phosphoinositide-3-kinases of class I regulate the DNA synthesis in a subgroup of astroglial cells. We have studied the location of these cells as well as the kinase isoforms which facilitate the S phase entry. Using dominant negative isoforms as well as selective pharmacological inhibitors we quantified S phase entry by nuclear labeling with bromodeoxyuridine. Only in astroglial cells harvested from the marginal zone of the neocortex inhibition of phosphoinositide-3-kinases reduced the nuclear labeling with bromodeoxyuridine, indicating that neocortical astroglial cells differ in the regulation of proliferation. The two kinase isoforms p110 and p110were essential for S phase entry. p110 diminished the level of the p27Kip1 which inactivates the complex of cyclin E and CDK2 necessary for entry into the S phase. p110phosphorylated and inhibited glycogen synthase kinase-3which can prevent S-phase entry. Taken together, both isoforms mediated S phase in a subgroup of neocortical astroglial cells and acted via distinct pathways.

  16. Neural progenitor and hemopoietic stem cells inhibit the growth of low-differentiated glioma.

    Science.gov (United States)

    Baklaushev, V P; Grinenko, N F; Savchenko, E A; Bykovskaya, S N; Yusubalieva, G M; Viktorov, I V; Bryukhovetskii, A S; Bryukhovetskii, I S; Chekhonin, V P

    2012-02-01

    The effects of neural progenitor and hemopoietic stem cells on C6 glioma cells were studied in in vivo and in vitro experiments. Considerable inhibition of proliferation during co-culturing of glioma cells with neural progenitor cells was revealed by quantitative MTT test and bromodeoxyuridine incorporation test. Labeled neural progenitor and hemopoietic stem cells implanted into the focus of experimental cerebral glioma C6 survive in the brain of experimental animals for at least 7 days, migrate with glioma cells, and accumulate in the peritumoral space. Under these conditions, neural progenitor cells differentiate with the formation of long processes. Morphometric analysis of glioma cells showed that implantation of neural progenitor and hemopoietic stem cells is accompanied by considerable inhibition of the growth of experimental glioma C6 in comparison with the control. The mechanisms of tumor-suppressive effects of neural and hemopoietic stem cells require further investigation.

  17. The multi-herbal formula Chong-Myung-Tang improves spatial memory and increases cell genesis in the dentate gyrus of aged mice.

    Science.gov (United States)

    Liu, Lei; Zhang, Mingwei; Zhang, Ruifen; Lee, Mira; Wang, Zhen; Hou, Jingang; Sung, Chang-Keun

    2014-01-01

    Chong-Myung-Tang (CMT) is a multi-herbal formula that has been used to improve memory. However, the potential mechanism remains unknown. The present study investigated the effects of CMT (50, 100, and 200 mg/kg) on spatial memory of aged mice. The behavioral training tests indicated that 200 mg/kg CMT treatment can significantly improve spatial memory of aged mice in the Morris water maze. Moreover, cell survival was examined by injecting bromodeoxyuridine (BrdU) on the first three days. The result showed that 200 mg/kg CMT treatment significantly increased cell survival in the dentate gyrus. Cell proliferation was determined by injecting BrdU 2 h before the mice were killed. The result suggested that CMT treatments had no influence on cell proliferation in the dentate gyrus. Thus, an increase in cell survival in the dentate gyrus stimulated by CMT may be involved in the effect of CMT on spatial memory improvement.

  18. Isolation and characterization of a herpesvirus from wild turkeys (Meleagris gallopavo osceola) in Florida.

    Science.gov (United States)

    Grant, H G; Ley, K D; Simpson, C F

    1975-10-01

    Viral agents producing both a syncytial-type cytopathic effect and type A intranuclear inclusion bodies in vitro were isolated from the kidneys of five of 10 wild turkeys. A plaque assay system for viral infectivity was developed and used to characterize one of the wild turkey viruses (WTV). WTV replication was inhibited by 5-bromodeoxyuridine, indicating the virus contained DNA as its genetic material. Virus infectivity could be transferred only as viable whole cell preparations; one cycle of rapid freezing and thawing completely inactivated the virus. Typical herpes-like virions were found within the nuclei when cells infected with WTV were examined by electron microscopy. WTV had characteristics typical of the herpes group of viruses.

  19. Energy Transfer between Fluorescein Isothiocyanate and Propidium Iodide – A Problem in the Estimation of Tpot with the Bromodeoxyuridine–DNA Flow Cytometry Technique?

    Directory of Open Access Journals (Sweden)

    Maria C. Johansson

    1999-01-01

    Full Text Available Energy transfer in flow cytometry can occur when two fluorochromes are bound in close proximity (generally within 100 Å and the emission spectrum of one fluorochrome overlaps significantly with the excitation spectrum of the other. The latter criterium is fullfilled for the fluorochromes fluorescein isothiocyanate and propidium iodide and also the former when they, e.g., are used in bromodeoxyuridine – DNA flow cytometry methods. In the present growth kinetic study using this method, we show that energy transfer does take place between fluorescein isothiocyanate and propidium iodide which results in a detected increase in DNA content with 2–3%. Despite the erroneous increase in the obtained DNA content values, this does not seem to have any influence on the calculation of DNA synthesis time and potential doubling time where the DNA content, based on the relative movement principle of the labelled cells, is used.

  20. Axonal plasticity elicits long-term changes in oligodendroglia and myelinated fibers

    DEFF Research Database (Denmark)

    Drøjdahl, Nina; Nielsen, Helle Hvilsted; Gardi, Jonathan E;

    2010-01-01

    Axons are linked to induction of myelination during development and to the maintenance of myelin and myelinated tracts in the adult CNS. Currently, it is unknown whether and how axonal plasticity in adult CNS impacts the myelinating cells and their precursors. In this article, we report that newly...... formed axonal sprouts are able to induce a protracted myelination response in adult CNS. We show that newly formed axonal sprouts, induced by lesion of the entorhino-hippocampal perforant pathway, have the ability to induce a myelination response in stratum radiatum and lucidum CA3. The lesion resulted...... in significant recruitment of newly formed myelinating cells, documented by incorporation of the proliferation marker bromodeoxyuridine into chondroitin sulphate NG2 expressing cells in stratum radiatum and lucidum CA3 early after lesion, and the occurrence of a 28% increase in the number of oligodendrocytes...

  1. Growth-related alterations during liver carcinogenesis: Effect of promoters

    Energy Technology Data Exchange (ETDEWEB)

    Seglen, P.O.; Gerlyng, P. (Norwegian Radium Hospital, Oslo (Norway))

    1990-08-01

    Bromodeoxyuridine labeling of DNA, binuclearity counting, and flow cytometric analysis of isolated hepatocytes and hepatocyte nuclei has been used to assess heptocellular growth patterns related to liver carcinogenesis. Three growth patterns can be distinguished. Mononucleating growth is observed during liver regeneration and after treatment with the tumor promoter 2-acetylaminofluorene (2-AAF) and its analogue 4-AAF. In this growth mode binucleation does not occur, resulting in a decrease in the fraction of binucleated cells. Binucleating growth is observed during normal liver development and after treatment with compounds such as phenobarbital, characterized by progressive polyploidization and maintenance of a binucleated cell fraction. Diploid growth is the growth pattern of neoplastic liver hepatocytes. Most of the cells in neoplastic lesions (foci, nodules, and carcinomas) are diploid, in contrast to the normal liver. Diploid tumor cells have a much higher proliferative activity than tetraploid tumor cells, suggesting that the latter may posses a limited growth potential that makes abrogation of binucleation proliferatively advantageous.

  2. Induction of DNA repair synthesis by ultraviolet radiation and methylmethanesulphonate in cultured mouse lymphocytes

    Energy Technology Data Exchange (ETDEWEB)

    Bianchi, V.; Zantedeschi, A.; Levis, A.G. (Padua Univ. (Italy). Ist. di Zoologia e Anatomia Comparata); Ronchese, F. (Inst. of Pathological Anatomy, Padua (Italy))

    1983-02-01

    The induction of DNA repair synthesis by UV-radiation and methylmethanesulphonate (MMS) was studied in mouse lymphocytes and leukemic cells by means of autoradiography and scintillation counting, after labelling in vitro with tritiated thymidine ((/sup 3/H)dThd). Repair stimulation was detected by both procedures in LSTRA AND YC8 leukemic cell lines as well as in primary fibroblasts of BALB/c and BALB/Mo mice. No stimulation was observed in primary cultures of lymphocytes from the spleen, thymus and lymph-nodes of the same mice. In primary lymphocytes neither stimulation with concanavalin A (Con A) nor pre-incubation with 5-bromodeoxyuridine (BUdR) were effective in making evident DNA repair. The data put into question the reliability of the repair test for the prediction of carcinogenic potential of chemicals.

  3. Spontaneous Proliferation in Organotypic Cultures of Mouse Cochleae

    Institute of Scientific and Technical Information of China (English)

    DING Da-lian; WANG Jian; YU Zhi-ping; JIANG Hai-yan; WANG Ping; Richard Salvi

    2008-01-01

    Cells in mammalian cochleae virtually stop proliferation and exit cellular circle before birth. Consequently, hair cells and spiral ganglion neurons destroyed by ototoxic factors cannot be replaced through proliferative regeneration. However, substantial proliferation occurs in organotypic cultures of cochleae from postnatal mice. In the present study, we studied the time course of proliferative growth in cultures of mouse cochlea explants obtained from up to 12 postnatal days. The mitotic nature of this growth was confirmed by bromodeoxyuridine (BrdU) staining and expression of proliferation cell nuclear antigen (PCNA) evaluated with real-time quantitative polymerase chain reaction(RT-PCR). Similar growth time course was found in the cochlear explants of different postnatal ages. The new growth reached its maximum at around 2 days in culture followed by a slow-down, and virtually stopped after 5 days of culture. The possible mechanisms and the significance of this proliferation are discussed.

  4. Erythropoietin-induced proliferation of gastric mucosal cells

    Institute of Scientific and Technical Information of China (English)

    Kazuro Itoh; Masato Higuchi; Fumio Ishihata; Yushi Sudoh; Soichiro Miura; Yoshio Sawasaki; Kyoko Takeuchi; Shingo Kato; Nobuhiro Imai; Yoichiro Kato; Noriyuki Shibata; Makio Kobayashi; Yoshiyuki Moriguchi

    2006-01-01

    AIM: To analyze the localization of erythropoietin receptor on gastric specimens and characterize the effects of erythropoietin on the normal gastric epithelial proliferation using a porcine gastric epithelial cell culture model.METHODS: Erythropoietin receptor was detected by RT-PCR, Western blotting and immunohistochermistry.Growth stimulation effects of erythropoietin on cultured gastric mucosal cells were determined by ELISA using bromodeoxyuridine (BrdU).RESULTS: Erythropoietin receptor was detected on cultured porcine gastric mucosal epithelial cells.Erythropoietin receptor was also detected histochemically at the base of gastric mucosal epithelium. BrdU assay demonstrated a dose-dependent increase in growth potential of cultured porcine gastric mucosal epithelial cells by administration of erythropoietin, as well as these effects were inhibited by administration of antierythropoietin antibody (P< 0.01).CONCLUSION: These findings indicate that erythropoietin has a potential to proliferate gastric mucosal epithelium via erythropoietin receptor.

  5. HAIR CELL-LIKE CELL GENERATION INDUCED BY NATURE CULTURE OF ADULT RAT AUDITORY EPITHELIUM

    Institute of Scientific and Technical Information of China (English)

    Liu Hui; Zhu Hongliang; Li Shengli; Yao Xiaobao; Wang Xiaoxia

    2006-01-01

    Objective To establish adult rat auditory epithelial cell culture and try to find precursor cells of auditory hair cells in vitro. Methods With refinement of culture media and techniques, cochlear sensory epithelial cells of adult rat were cultured. Immunocytochemistry and Bromodeoxyuridine (BrdU)labeling were used to detect properties and mitotic status of cultured cells. Results The cultured auditory epithelial cells showed a large, flat epithelial morphotype and expressed F-actin and cytokeratin, a subset of cells generated from auditory epithelium were labeled by calretinin, a specific marker of early hair cell. Conclusion Adult rat auditory epithelium can be induced to generate hair cell-like cells by nature culture, this phenomenon suggests that progenitor cells may exist in rat cochlea and they may give birth to new hair cells. Whether these progenitor cells are tissue specific stem cells is still need more study.

  6. Monovalent ions control proliferation of Ehrlich Lettre ascites cells

    DEFF Research Database (Denmark)

    Klausen, Thomas Kjaer; Preisler, Sarah; Pedersen, Stine Helene Falsig

    2010-01-01

    of Ehrlich Lettre ascites (ELA) cells. We measured the intracellular concentration of each ion in G(0), G(1), and S phases of the cell cycle following synchronization by serum starvation and release. We show that intracellular concentrations and content of Na+ and Cl(-) were reduced in the G(0)-G(1) phase...... transition, followed by an increased content of both ions in S phase concomitant with water uptake. The effect of substituting extracellular monovalent ions was investigated by bromodeoxyuridine incorporation and showed marked reduction after Na+ and Cl(-) substitution. In spectrofluorometric measurements...... DiBaC4(3) showed a reduced Cl(-) conductance in S compared with G(1) followed by transmembrane potential (E(m)) hyperpolarization in S. Cl(-) substitution by impermeable anions strongly inhibited proliferation and increased free, intracellular Ca2+ ([Ca2+]i), whereas a more permeable anion had little...

  7. Increased cellular hypoxia and reduced proliferation of both normal and leukaemic cells during progression of acute myeloid leukaemia in rats

    DEFF Research Database (Denmark)

    Jensen, P O; Mortensen, B T; Hodgkiss, R J

    2000-01-01

    The microenvironmental changes in the bone marrow, spleen and liver during progression of the transplantable promyelocytic leukaemia in the Brown Norwegian rat (BNML) have been studied. We used flow cytometry to estimate cellular hypoxia and proliferation based on in vivo pulse-labelling with a m......The microenvironmental changes in the bone marrow, spleen and liver during progression of the transplantable promyelocytic leukaemia in the Brown Norwegian rat (BNML) have been studied. We used flow cytometry to estimate cellular hypoxia and proliferation based on in vivo pulse......-labelling with a mixture of 2-nitroimidazole linked to theophylline (NITP) and bromodeoxyuridine (BrdUrd). The leukaemic cells were identified with the RM124 antibody. In rats inoculated with leukaemic cells the fraction of RM124+ cells was significantly increased from day 20 onwards in the spleen and from day 27...

  8. ADAM12-S stimulates bone growth in transgenic mice by modulating chondrocyte proliferation and maturation

    DEFF Research Database (Denmark)

    Kveiborg, Marie; Albrechtsen, Reidar; Rudkjaer, Lise;

    2006-01-01

    -extracellular matrix interactions in the growth plate. INTRODUCTION: The disintegrin and metalloprotease ADAM12 is expressed in both osteoblasts and osteoclasts, suggesting a regulatory role of ADAM12 in bone. However, thus far, no in vivo function of ADAM12 in the skeleton has been reported. MATERIALS AND METHODS......: Transgenic mice expressing the secreted form of human ADAM12, ADAM12-S, or a truncated metalloprotease-deficient form of ADAM12-S in the circulation were used to study the effects of ADAM12 on the skeleton. In addition, murine chondrocyte cultures were used to study the effect of ADAM12-S on cell...... in mice expressing higher levels of the transgene than in a lower-expressing line. Histological analysis revealed no alterations in the growth plate organization, but mean growth plate width was increased. Both the cellular incorporation of bromodeoxyuridine and the width of the collagen type X...

  9. Primary culture and identification of sinoatrial node cells from newborn rat

    Institute of Scientific and Technical Information of China (English)

    宋治远; 钟理; 仝识非; 何国祥

    2003-01-01

    Objective To establish a reliable approach to primary culture and identification of sinoatrial node (SAN) cells. Methods The SAN cells were cultured from SAN tissue removed from neonatal Wistar rats and purified with differential attachment and 5'-bromodeoxyuridine (BrdU) treatment. The obtained cells were morphologically observed with inverted microscopy and transmission electron microscopy. Its action potential was recorded using electrophysiological methods.Results Three distinctly different cells were observed in the cultured SAN cells: spindle, triangle and irregular. Of these, the spindle cells comprised the greatest proportion, with their shape, structure and electrophysiological characteristics consistent with those of the pacemaker cells of SAN. The triangle cells were similar in features to the similarly shaped myocytes located in the atrial myocardium. Conclusions The culture method of differential attachment combined with BrdU treatment is a reliable approach to growing SAN cells. Of the cells cultured from SAN, the spindle cells appear to function as pacemaker cells.

  10. Deficient leukemia inhibitory factor signaling in muscle precursor cells from patients with type 2 diabetes

    DEFF Research Database (Denmark)

    Broholm, Christa; Brandt, Claus; Schultz, Ninna S;

    2012-01-01

    The cytokine leukemia-inhibitory factor (LIF) is expressed by skeletal muscle and induces proliferation of muscle precursor cells, an important feature of skeletal muscle maintenance and repair. We hypothesized that muscle precursor cells from patients with type 2 diabetes had a deficient response...... to LIF. The mRNA and protein expressions of LIF and its receptor (LIFR) were measured in skeletal muscle biopsies from healthy individuals and patients with type 2 diabetes by use of qPCR and Western blot. LIF signaling and response were studied following administration of recombinant LIF and si......RNA knockdown of suppressor of cytokine signaling (SOCS)3 in myoblast cultures established from healthy individuals and patients with type 2 diabetes. Myoblast proliferation rate was assessed by bromodeoxyuridine incorporation. LIF and LIFR proteins were increased in both muscle tissue and cultured myoblasts...

  11. [Identification of proliferating cells in Taenia solium cysts].

    Science.gov (United States)

    Orrego-Solano, Miguel Ángel; Cangalaya, Carla; Nash, Theodore E; Guerra-Giraldez, Cristina

    2014-01-01

    Neoblasts are totipotent cells, solely responsible for the proliferation and maturation of tissues in free-living flatworms. Similar cells have been isolated from parasitic flatworms such as Echinococcus. Taenia solium causes human taeniasis (intestinal) and cysticercosis in humans and pigs. Brain infection with larvae (cysts) of T. solium results in neurocysticercosis which is hyperendemic in Peru, and its treatment is associated with serious neurological symptoms. The proliferative capacity and development stages of T. solium have not been described and the neoblasts of this parasite have not been characterized We looked for cell proliferation in T. solium cysts collected from an infected pig, which were identified when replicating and incorporating bromodeoxyuridine nucleotide detected with a monoclonal antibody. A stable cell line of neoblasts would be useful for systematic in vitro studies on drug efficacy and the biology of T. solium.

  12. Recombinant human erythropoietin increases cerebral cortical width index and neurogenesis following ischemic stroke

    Institute of Scientific and Technical Information of China (English)

    Zhongmin Wen; Peiji Wang

    2012-01-01

    The cerebral cortical expansion index refers to the ratio between left and right cortex width and is recognized as an indicator for cortical hyperplasia. Cerebral ischemia was established in CB-17 mice in the present study, and the mice were subsequently treated with recombinant human erythropoietin via subcutaneous injection. Results demonstrated that cerebral cortical width index significantly increased. Immunofluorescence detection showed that the number of nuclear antigen antibody/5-bromodeoxyuridine-positive cells at the infarction edge significantly increased. Correlation analysis revealed a negative correlation between neurological scores and cortical width indices in rats following ischemic stroke. These experimental findings suggested that recombinant human erythropoietin promoted cerebral cortical hyperplasia, increased cortical neurogenesis, and enhanced functional recovery following ischemic stroke.

  13. Sevoflurane exposure in 7-day-old rats affects neurogenesis,neurodegeneration and neurocognitive function

    Institute of Scientific and Technical Information of China (English)

    Fang Fang; Zhanggang Xue; Jing Cang

    2012-01-01

    Objective Sevoflurane is widely used in pediatric anesthesia and former studies showed that it causes neurodegeneration in the developing brain.The present study was carried out to investigate the effects of sevoflurane on neurogenesis,neurodegeneration and behavior.Methods We administered 5-bromodeoxyuridine,an S-phase marker,before,during,and after 4 h of sevoflurane given to rats on postnatal day 7 to assess dentate gyrus progenitor proliferation and Fluoro-Jade staining for degeneration.Spatial reference memory was tested 2 and 6 weeks after anesthesia.Results Sevoflurane decreased progenitor proliferation and increased cell death until at least 4 days after anesthesia.Spatial reference memory was not affected at 2 weeks but was affected at 6 weeks after sevoflurane administration.Conclusion Sevoflurane reduces neurogenesis and increases the death of progenitor cells in developing brain.This might mediate the lateonset neurocognitive outcome after sevoflurane application.

  14. Axonal lesion-induced microglial proliferation and microglial cluster formation in the mouse

    DEFF Research Database (Denmark)

    Dissing-Olesen, L; Ladeby, R; Nielsen, Helle Hvilsted;

    2007-01-01

    Microglia are innate immune cells and form the first line of defense of the CNS. Proliferation is a key event in the activation of microglia in acute pathology, and has been extensively characterized in rats, but not in mice. In this study we investigated axonal-lesion-induced microglial...... proliferation and surface antigen expression in C57BL/6 mice. Transection of the entorhino-dentate perforant path projection results in an anterograde axonal and a dense terminal degeneration that induces a region-specific activation of microglia in the dentate gyrus. Time-course analysis showed activation...... and the proliferation marker bromodeoxyuridine, injected 1 h prior to perfusion, showed that lesion-reactive microglia accounted for the vast majority of proliferating cells. Microglia proliferated as soon as 24 h after lesion and 25% of all microglial cells were proliferating 3 days post-lesion. Immunofluorescence...

  15. Temporal and spacial changes of BrdU immunoreactivity in amygdala kindling development.

    Science.gov (United States)

    Sato, K; Iwai, M; Nagano, I; Shoji, M; Abe, K

    2002-09-01

    To investigate the proliferation of neural stem cells (NSC) in epileptic brain, spaciotemporal expression of immunoreactive bromodeoxyuridine (BrdU) was examined in kindling development of rat. Amygdaloid kindling in partial seizure (PS) was effective in proliferation of NSC detected with BrdU-labeling in subventricular zone (SVZ), but not in dentate gyrus (DG). In SVZ, however, the BrdU-labeling cells decreased at stage generalized seizure (GS). These facts indicate that proliferation of NSC increased with PS and decreased with more severe seizures of GS in SVZ, that such a proliferation did not occur in DG with PS or GS. Thus, the proliferation of NSC was spacially and temporally different between brain regions depending on different kindling stages.

  16. Increased cellular hypoxia and reduced proliferation of both normal and leukaemic cells during progression of acute myeloid leukaemia in rats

    DEFF Research Database (Denmark)

    Jensen, P O; Mortensen, B T; Hodgkiss, R J;

    2000-01-01

    The microenvironmental changes in the bone marrow, spleen and liver during progression of the transplantable promyelocytic leukaemia in the Brown Norwegian rat (BNML) have been studied. We used flow cytometry to estimate cellular hypoxia and proliferation based on in vivo pulse...... in the bone marrow and liver, reaching a level of 65-87% in these organs at day 32. At day 32, the NITP+ fraction of RM124+ cells had increased significantly in the bone marrow and spleen to 88% and 90%, respectively. The corresponding fractions of NITP+ normal cells reached 63% and 65%, respectively. From......-labelling with a mixture of 2-nitroimidazole linked to theophylline (NITP) and bromodeoxyuridine (BrdUrd). The leukaemic cells were identified with the RM124 antibody. In rats inoculated with leukaemic cells the fraction of RM124+ cells was significantly increased from day 20 onwards in the spleen and from day 27...

  17. Cell kinetic study on the relation between irradiation hypogeusia and taste buds in rats

    Energy Technology Data Exchange (ETDEWEB)

    Kubota, Hideharu; Furumoto, Keiichi [Nippon Dental Univ., Tokyo (Japan)

    1998-12-01

    The present study was designed to elucidate the mechanism of hypogeusia caused by irradiation. X-ray treatment at 10 Gy or 20 Gy was given to the maxillofacial region including the tongue in rats, and the involvement of taste bud for hypogeusia was investigated. In addition, cytological kinetics were immunohistologically studied using bromodeoxyuridine in the taste bud and in the lingual mucosal epithelium. The following results were obtained: In the 10 Gy group, the number of taste bud become less after the exposure, but no hypogeusia was observed during the experimental period. In the 20 Gy group, any labeled taste bud was not observed on the 7th day, and all taste buds disappeared by the 10th day. In the lingual mucosal epithelium, the number of basal cells decreased to the minimum, and the body weight and total water intake decreased coincidently in the 20 Gy group, which were few in the 10 Gy group. (author)

  18. Skp2 deletion unmasks a p27 safeguard that blocks tumorigenesis in the absence of pRb and p53 tumor suppressors.

    Science.gov (United States)

    Zhao, Hongling; Bauzon, Frederick; Fu, Hao; Lu, Zhonglei; Cui, Jinhua; Nakayama, Keiko; Nakayama, Keiich I; Locker, Joseph; Zhu, Liang

    2013-11-11

    pRb and p53 are two major tumor suppressors. Here, we found that p53 activates expression of Pirh2 and KPC1, two of the three ubiquitin ligases for p27. Loss of p53 in the absence of Skp2, the third ubiquitin ligase for p27, shrinks the cellular pool of p27 ubiquitin ligases to accumulate p27 protein. In the absence of pRb and p53, p27 was unable to inhibit DNA synthesis in spite of its abundance, but could inhibit division of cells that maintain DNA replication with rereplication. This mechanism blocked pRb/p53 doubly deficient pituitary and prostate tumorigenesis lastingly coexistent with bromodeoxyuridine-labeling neoplastic lesions, revealing an unconventional cancer cell vulnerability when pRb and p53 are inactivated.

  19. Electrophysiological functional recovery in a rat model of spinal cord hemisection injury following bone marrow-derived mesenchymal stem cell transplantation under hypothermia

    Institute of Scientific and Technical Information of China (English)

    Dong Wang; Jianjun Zhang

    2012-01-01

    Following successful establishment of a rat model of spinal cord hemisection injury by resecting right spinal cord tissues, bone marrow stem cells were transplanted into the spinal cord lesions via the caudal vein while maintaining rectal temperature at 34 ± 0.5°C for 6 hours (mild hypothermia). Hematoxylin-eosin staining showed that astrocytes gathered around the injury site and formed scars at 4 weeks post-transplantation. Compared with rats transplanted with bone marrow stem cells under normal temperature, rats transplanted with bone marrow stem cells under hypothermia showed increased numbers of proliferating cells (bromodeoxyuridine-positive cells), better recovery of somatosensory-evoked and motor-evoked potentials, greater Basso, Beattie, and Bresnahan locomotor rating scores, and an increased degree of angle in the incline plate test. These findings suggested that hypothermia combined with bone marrow mesenchymal stem cells transplantation effectively promoted electrical conduction and nerve functional repair in a rat model of spinal cord hemisection injury.

  20. Changing bone marrow micro-environment during development of acute myeloid leukaemia in rats

    DEFF Research Database (Denmark)

    Mortensen, B T; Jensen, P O; Helledie, N;

    1998-01-01

    The Brown Norwegian rat transplanted with promyelocytic leukaemic cells (BNML) has been used as a model for human acute myeloid leukaemia. We have previously shown that both the blood supply to the bone marrow and the metabolic rate decrease in relation to the leukaemic development in these rats....... Here we have investigated how the development and progression of this leukaemia affect oxygenation, pH and proliferation of normal and leukaemic cells in vivo. Bone marrow pH was measured by a needle electrode. Nitroimidazol-theophylline (NITP) was used to identify hypoxic cells, and we applied...... bromodeoxyuridine (BrdUrd) to identify DNA replicating cells. The leukaemia progressed slowly until day 27 after which a rapid deterioration could be observed leading to severe changes over the following 5 d. In whole blood there was evidence of progressing metabolic acidosis. In bone marrow the fraction...

  1. Immunohistochemical characterization of cellular proliferation in small intestinal hyperplasia of rats with hepatic Strobilocercus fasciolaris infection.

    Science.gov (United States)

    Lagapa, J T; Oku, Y; Kamiya, M

    2008-07-01

    Rats infected with the larvae of Taenia taeniaeformis harbour the intermediate stage of the parasite Strobilocercus fasciolaris within the liver. Affected animals also develop gastric and intestinal hyperplasia. The pathogenesis of the gastric hyperplasia has been extensively investigated, but few studies have addressed the nature of the intestinal changes. This study characterizes the proliferation of small intestinal epithelial cells by immunohistochemical labelling for proliferating cell nuclear antigen (PCNA) and bromodeoxyuridine (BrdU) uptake. At 6 weeks post-infection (wpi) there was an increase in villous length but crypt depth was normal. At 9 wpi there was evidence of epithelial hyperplasia, increased villous length and crypt depth, and expansion of zones of epithelial proliferation. Immunohistochemical labelling indicated that an increase in the number of proliferating cells produced a greater number of progeny cells. Intestinal hyperplasia during experimental infection with T. taeniaeformis larvae is likely to be related to the associated gastropathy, although the mechanisms underlying both changes remain undefined.

  2. Feeding an elemental diet vs a milk-based formula does not decrease intestinal mucosal growth in infant pigs

    DEFF Research Database (Denmark)

    Stoll, Barbara; Price, Pamela T; Reeds, Peter J

    2006-01-01

    conclude that intestinal mucosal growth and villus morphology are similar in pigs fed ED and FORM, despite higher cell proliferation and protein synthesis rates and lower lactase activity with ED. This implies that elemental diets may be as trophic as polymeric formulas to simultaneously provide nutrition...... (lactose, protein, lipid [FORM]) reduces small intestinal growth and lactase activity. METHODS: Three-week-old piglets were fed either ED (n = 7) intragastrically or FORM (n = 6) orally for 6 days. RESULTS: Intestinal protein and DNA masses, villus height, and crypt depth were not different in ED and FORM...... pigs. Crypt cell proliferation, measured by in vivo bromodeoxyuridine labeling, was significantly (p synthesis (%/d), measured by in vivo 2H-leucine incorporation, were higher (p

  3. Exercise Enhances Learning and Hippocampal Neurogenesis in Aged Mice

    Science.gov (United States)

    Praag, Henriette van; Shubert, Tiffany; Zhao, Chunmei; Gage, Fred H.

    2005-01-01

    Aging causes changes in the hippocampus that may lead to cognitive decline in older adults. In young animals, exercise increases hippocampal neurogenesis and improves learning. We investigated whether voluntary wheel running would benefit mice that were sedentary until 19 months of age. Specifically, young and aged mice were housed with or without a running wheel and injected with bromodeoxyuridine or retrovirus to label newborn cells. After 1 month, learning was tested in the Morris water maze. Aged runners showed faster acquisition and better retention of the maze than age-matched controls. The decline in neurogenesis in aged mice was reversed to 50% of young control levels by running. Moreover, fine morphology of new neurons did not differ between young and aged runners, indicating that the initial maturation of newborn neurons was not affected by aging. Thus, voluntary exercise ameliorates some of the deleterious morphological and behavioral consequences of aging. PMID:16177036

  4. Running increases cell proliferation and neurogenesis in the adult mouse dentate gyrus.

    Science.gov (United States)

    van Praag, H; Kempermann, G; Gage, F H

    1999-03-01

    Exposure to an enriched environment increases neurogenesis in the dentate gyrus of adult rodents. Environmental enrichment, however, typically consists of many components, such as expanded learning opportunities, increased social interaction, more physical activity and larger housing. We attempted to separate components by assigning adult mice to various conditions: water-maze learning (learner), swim-time-yoked control (swimmer), voluntary wheel running (runner), and enriched (enriched) and standard housing (control) groups. Neither maze training nor yoked swimming had any effect on bromodeoxyuridine (BrdU)-positive cell number. However, running doubled the number of surviving newborn cells, in amounts similar to enrichment conditions. Our findings demonstrate that voluntary exercise is sufficient for enhanced neurogenesis in the adult mouse dentate gyrus.

  5. Subretinal posterior pole injury induces selective proliferation of RPE cells in the periphery in in vivo studies in pigs

    DEFF Research Database (Denmark)

    Kiilgaard, Jens Folke; Prause, Jan U; Prause, Michala;

    2007-01-01

    PURPOSE: To study topographical differences in porcine retinal pigment epithelial (RPE) cell proliferation (1) in vivo, after experimental central surgical subretinal injury, and (2) in vitro. METHODS: Domestic pigs underwent either experimental RPE debridement (n = 5), subretinal amniotic membrane...... of porcine RPE cells in culture. After 1 and 4 days in culture, pre-equatorial RPE cells had incorporated significantly more [(3)H]thymidine than had the more central RPE cells. CONCLUSIONS: Experimental subretinal surgical injury of the RPE below the central retina is followed within 48 hours...... transplantation (n= 4), or both (n= 1) in the left eye. RPE cell proliferation was assayed by injection of the thymidine analogue 5-bromodeoxyuridine (5-BrdU) at postoperative day 0 and 1. RPE cells in S-phase were identified by their incorporation of 5-BrdU, as detected by immunohistochemistry. The in vitro...

  6. S-phase-dependent cell cycle disturbances caused by Aleutian mink disease parvovirus

    DEFF Research Database (Denmark)

    Oleksiewicz, M.B.; Alexandersen, Søren

    1997-01-01

    We examined replication of the autonomous parovirus Aleutian mink disease parovirus (ADV) in relation to cell cycle progression of permissive Crandell feline kidney (CRFK) cells. Flow cytometric analysis showed that ADV caused a composite, binary pattern of cell cycle arrest. ADV-induced cell cycle...... with subthreshold levels of ADV products through the late S/G(2) block and, consequently, that the binary pattern of ADV-induced cell cycle arrest may be governed merely by viral replication levels within a single S phase. Flow cytometric analysis of propidium iodide fluorescence and bromodeoxyuridine uptake showed...... that population A cells sustained significantly higher levels of DNA replication than population B cells during the ADV-induced cell cycle arrest. Therefore, the type of ADV-induced cell cycle arrest was not trivial and could have implications for subsequent viral replication in the target cell....

  7. Cell Proliferation Analysis Using EdU Labeling in Whole Plant and Histological Samples of Arabidopsis.

    Science.gov (United States)

    Kazda, Anita; Akimcheva, Svetlana; Watson, J Matthew; Riha, Karel

    2016-01-01

    The ability to analyze cell division in both spatial and temporal dimensions within an organism is a key requirement in developmental biology. Specialized cell types within individual organs, such as those within shoot and root apical meristems, have often been identified by differences in their rates of proliferation prior to the characterization of distinguishing molecular markers. Replication-dependent labeling of DNA is a widely used method for assaying cell proliferation. The earliest approaches used radioactive labeling with tritiated thymidine, which were later followed by immunodetection of bromodeoxyuridine (BrdU). A major advance in DNA labeling came with the use of 5-ethynyl-2'deoxyuridine (EdU) which has proven to have multiple advantages over BrdU. Here we describe the methodology for analyzing EdU labeling and retention in whole plants and histological sections of Arabidopsis.

  8. Monitoring DNA replication in fission yeast by incorporation of 5-ethynyl-2'-deoxyuridine.

    Science.gov (United States)

    Hua, Hui; Kearsey, Stephen E

    2011-05-01

    We report procedures to allow incorporation and detection of 5-ethynyl-2'-deoxyuridine (EdU) in fission yeast, a thymidine analogue which has some technical advantages over use of bromodeoxyuridine. Low concentrations of EdU (1 µM) are sufficient to allow detection of incorporation in cells expressing thymidine kinase and human equilibrative nucleoside transporter 1 (hENT1). However EdU is toxic and activates the rad3-dependent checkpoint, resulting in cell cycle arrest, potentially limiting its applications for procedures which require labelling over more than one cell cycle. Limited DNA synthesis, when elongation is largely blocked by hydroxyurea, can be readily detected by EdU incorporation using fluorescence microscopy. Thus EdU should be useful for detecting early stages of S phase, or DNA synthesis associated with DNA repair and recombination.

  9. Nuclear vasohibin-2 promotes cell proliferation by inducing G0/G1 to S phase progression.

    Science.gov (United States)

    Ge, Qianqian; Zhou, Jia; Tu, Min; Xue, Xiaofeng; Li, Zhanjun; Lu, Zipeng; Wei, Jishu; Song, Guoxin; Chen, Jianmin; Guo, Feng; Jiang, Kuirong; Miao, Yi; Gao, Wentao

    2015-09-01

    As a member of the vasohibin (VASH2) family, VASH2 is localized intracellularly as a nuclear and cytoplasmic type. Cytoplasmic VASH2 is associated with carcinoma angiogenesis and malignant transformation and promotes cancer growth. However, the function of nuclear VASH2 has yet to be investigated. The aim of the present study was to detect the nuclear VASH2 expression profile in human organs and tissues by protein microarray technique. To examine the function of nuclear VASH2, we analyzed the relationship between nuclear VASH2 and Ki-67, and stably constructed VASH2 overexpression and knockdown in LO2 and HepG2 cell lines, based on a previous study in hepatic cells. The study was conducted using bromodeoxyuridine, immunofluorescent staining, western blot analysis and flow cytometry. Nuclear VASH2 was highly expressed in actively dividing cells in normal and cancer tissues. There was a significant positive correlation between nuclear VASH2 and Ki-67, indicating that nuclear VASH2 positively correlated with cell proliferation in normal and cancer tissues. The bromodeoxyuridine (BrdU) proliferation test showed that nuclear VASH2 increased the S-phase population and promoted cell proliferation, while VASH2 knockdown reduced BrdU absorbance. Cell cycle analysis revealed that nuclear VASH2 overexpression increased the S-phase population in LO2 and HepG2 cells, while nuclear VASH2 knockdown reduced the S-phase population and increased the G0/G1 population. The findings of this study challenge the classic view of VASH2, which was previously reported as an angiogenesis factor. Furthermore, to the best of our knowledge, these results are the first clinical data indicating that nuclear VASH2, but not cytoplasmic VASH2, promotes cell proliferation by driving the cell cycle from the G0/G1 to S phase.

  10. Cellular heredity in haploid cultures of somatic cells. Comprehensive report, April 1975--June 1977. [UV radiation

    Energy Technology Data Exchange (ETDEWEB)

    Freed, J.J.

    1977-07-01

    This report reviews genetic studies carried out since 1975 on a haploid cultured cell line from frog embryos (ICR 2A). Although a single chromosome set would be expected to facilitate recovery of recessive mutants, experiments suggested that cell culture variants might arise through processes more complex than the selection of simple mutational changes. Therefore, the objectives of the work reported here have been to throw light on just how cell culture variants arise in this system. First, we have continued to characterize the ICR 2A line, with emphasis on stability of karyotype and DNA content. Second, we have studied in detail the origin of two classes of drug-resistant variants. Bromodeoxyuridine resistance of the thymidine deficiency type has been shown to arise through sequential loss of two forms of thymidine-phosphorylating enzyme; loss of the second form of enzyme is complex, suggesting that changes more complex than simple recessive mutations may be involved. Another form of resistance, in which tolerance of high levels of bromodeoxyuridine is found in cells that continue to express thymidine kinase, remains under study. Variants resistant to microtubule inhibitors were isolated. It was found that these haploid strains have properties distinguishing them from analogous resistant strains isolated from diploid mammalian cell cultures in other laboratories. In order to understand better how mutagens are involved in the origin of cell culture variants, we have examined the effect of different forms of DNA repair on the frequency of drug-resistant colonies induced by ultraviolet radiation. Preliminary experiments suggest that the frequency of such colonies is greater when repair takes place through (presumably error-prone) dark repair than when (error-free) photoreversal is allowed to occur. Such experiments can determine whether new phenotypes arise from alterations in DNA, and thus whether, in a broad sense, they are likely to be mutational in nature.

  11. Binding specificity and stability of duplexes formed by modified oligonucleotides with a 4096-hexanucleotide microarray

    Science.gov (United States)

    Timofeev, Edward; Mirzabekov, Andrei

    2001-01-01

    The binding of oligodeoxynucleotides modified with adenine 2′-O-methyl riboside, 2,6-diaminopurine 2′-O-methyl riboside, cytosine 2′-O-methyl riboside, 2,6-diaminopurine deoxyriboside or 5-bromodeoxyuridine was studied with a microarray containing all possible (4096) polyacrylamide-bound hexadeoxynucleotides (a generic microchip). The generic microchip was manufactured by using reductive immobilization of aminooligonucleotides in the activated copolymer of acrylamide, bis-acrylamide and N-(2,2-dimethoxyethyl) acrylamide. The binding of the fluorescently labeled modified octanucleotides to the array was analyzed with the use of both melting profiles and the fluorescence distribution at selected temperatures. Up to three substitutions of adenosines in the octamer sequence by adenine 2′-O-methyl ribosides (Am), 2,6-diaminopurine 2′-O-methyl ribosides (Dm) or 2,6-diaminopurine deoxyribosides (D) resulted in increased mismatch discrimination measured at the melting temperature of the corresponding perfect duplex. The stability of complexes formed by 2′-O-methyl-adenosine-modified oligodeoxynucleotides was slightly decreased with every additional substitution, yielding ∼4°C of total loss in melting temperature for three modifications, as followed from microchip thermal denaturation experiments. 2,6-Diaminopurine 2′-O-methyl riboside modifications led to considerable duplex stabilization. The cytosine 2′-O-methyl riboside and 5-bromodeoxyuridine modifications generally did not change either duplex stability or mismatch resolution. Denaturation experiments conducted with selected perfect duplexes on microchips and in solution showed similar results on thermal stabilities. Some hybridization artifacts were observed that might indicate the formation of parallel DNA. PMID:11410672

  12. Molecular and histological evaluation of tributyltin toxicity on spermatogenesis in a marine fish, the mummichog (Fundulus heteroclitus)

    Energy Technology Data Exchange (ETDEWEB)

    Mochida, Kazuhiko [National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Maruishi 2-17-5, Hatsukaichi, Hiroshima 739-0452 (Japan)]. E-mail: kmochida@fra.affrc.go.jp; Ito, Katsutoshi [National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Maruishi 2-17-5, Hatsukaichi, Hiroshima 739-0452 (Japan); Kono, Kumiko [National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Maruishi 2-17-5, Hatsukaichi, Hiroshima 739-0452 (Japan); Onduka, Toshimitsu [National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Maruishi 2-17-5, Hatsukaichi, Hiroshima 739-0452 (Japan); Kakuno, Akira [National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Maruishi 2-17-5, Hatsukaichi, Hiroshima 739-0452 (Japan); Fujii, Kazunori [National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, Maruishi 2-17-5, Hatsukaichi, Hiroshima 739-0452 (Japan)

    2007-06-05

    There is still concern about the effects of organotin compounds (OTs) on marine organisms, and especially on their reproductive systems. We investigated the toxicity of tributyltin oxide (TBTO) on spermatogenesis in a marine fish, mummichog, Fundulus heteroclitus. TBTO exposure caused serious histological damage to the testis, including reduction in counts of spermatids and spermatozoa and malformation of somatic cells around the seminal duct. Analysis of the incorporation of bromodeoxyuridine into spermatogenic cells revealed inhibition of the proliferation of germ cells. To find a biomarker for evaluation of the effects of TBTO on fish spermatogenesis, we cloned genes downregulated by TBTO exposure in the mummichog testis, and identified mummichog creatine kinase (mCK). The cDNA sequence of mCK contained an open reading frame encoding 387 amino acid residues (M {sub r} = 43,344). The derived amino acid sequence of mCK was very similar to that of the testicular-type CK of the rainbow trout, Oncorhynchus mykiss. Furthermore, Northern blot analysis revealed that mCK was produced specifically in the testis. We therefore identified mCK in the mummichog as a testicular-type CK. Real-time PCR revealed that exposure of the fish to TBTO significantly reduced mCK expression in the testis. To some extent, this reduction was coincident with that of bromodeoxyuridine incorporation into spermatogenic cells. The mCK gene can therefore be used as a biomarker for evaluating the effects of TBTO on fish spermatogenesis. In addition, levels of expression of the mCK gene in control fish were well correlated with increments in the gonad somatic index (GSI) below 4%. Individuals that were thought to have testicular damage caused by TBTO could be discriminated from those considered normal. The results suggest that TBTO is involved in the suppression of fish spermatogenesis and that analysis of both GSI values and mCK gene expression is useful for evaluating the levels of xenobiotic

  13. Effects of binge ethanol exposure during first-trimester equivalent on corticothalamic neurons in Swiss Webster outbred mice.

    Science.gov (United States)

    White, Samantha A; Weber, Jennilyn N; Howard, Christopher D; Favero, Carlita B

    2015-12-16

    Fetal alcohol spectrum disorders range in severity depending on the amount, timing, and frequency of alcohol exposure. Regardless of severity, sensorimotor defects are commonly reported. Sensorimotor information travels through three tracts of the internal capsule: thalamocortical axons, corticothalamic axons, and corticospinal axons. Here we describe the effects of binge ethanol exposure during the first-trimester equivalent on corticothalamic neurons using Swiss Webster mice. We injected pregnant mice with ethanol (2.9 g/kg, intraperitoneal, followed by 1.45 g/kg, intraperitoneal, 2 h later) on embryonic days (E) 11.5, 12.5, and 13.5. Our paradigm resulted in a mean maternal blood ethanol content of 294.8±15.4 mg/dl on E12.5 and 258.3±22.2 mg/dl on E13.5. Control dams were injected with an equivalent volume of PBS. Bromodeoxyuridine birthdating was carried out on E11.5 to label S-phase neurons. The days of injection were chosen because they are at the onset of neurogenesis and axon extension for corticothalamic, thalamocortical, and corticospinal neurons. Ethanol-exposed pups exhibited no differences compared with controls on day of birth in litter size, body weight, or brain weight. Corticothalamic neurons labeled with bromodeoxyuridine and T-box brain 1 were located in the deep layers of the cortex and did not differ in number in both groups. These results contrast several studies demonstrating alcohol-related differences in these parameters using chronic ethanol exposure paradigms and inbred mouse strains. Therefore, our findings highlight the importance of expanding the mouse strains used to model fetal alcohol spectrum disorder to enhance our understanding of its complex etiology.

  14. Trefoil factor 3 stimulates human and rodent pancreatic islet beta-cell replication with retention of function.

    Science.gov (United States)

    Fueger, Patrick T; Schisler, Jonathan C; Lu, Danhong; Babu, Daniella A; Mirmira, Raghavendra G; Newgard, Christopher B; Hohmeier, Hans E

    2008-05-01

    Both major forms of diabetes involve a decline in beta-cell mass, mediated by autoimmune destruction of insulin-producing cells in type 1 diabetes and by increased rates of apoptosis secondary to metabolic stress in type 2 diabetes. Methods for controlled expansion of beta-cell mass are currently not available but would have great potential utility for treatment of these diseases. In the current study, we demonstrate that overexpression of trefoil factor 3 (TFF3) in rat pancreatic islets results in a 4- to 5-fold increase in [(3)H]thymidine incorporation, with full retention of glucose-stimulated insulin secretion. This increase was almost exclusively due to stimulation of beta-cell replication, as demonstrated by studies of bromodeoxyuridine incorporation and co-immunofluorescence analysis with anti-bromodeoxyuridine and antiinsulin or antiglucagon antibodies. The proliferative effect of TFF3 required the presence of serum or 0.5 ng/ml epidermal growth factor. The ability of TFF3 overexpression to stimulate proliferation of rat islets in serum was abolished by the addition of epidermal growth factor receptor antagonist AG1478. Furthermore, TFF3-induced increases in [3H]thymidine incorporation in rat islets cultured in serum was blocked by overexpression of a dominant-negative Akt protein or treatment with triciribine, an Akt inhibitor. Finally, overexpression of TFF3 also caused a doubling of [3H]thymidine incorporation in human islets. In summary, our findings reveal a novel TFF3-mediated pathway for stimulation of beta-cell replication that could ultimately be exploited for expansion or preservation of islet beta-cell mass.

  15. Nogo-a regulates neural precursor migration in the embryonic mouse cortex.

    Science.gov (United States)

    Mathis, Carole; Schröter, Aileen; Thallmair, Michaela; Schwab, Martin E

    2010-10-01

    Although Nogo-A has been intensively studied for its inhibitory effect on axonal regeneration in the adult central nervous system, little is known about its function during brain development. In the embryonic mouse cortex, Nogo-A is expressed by radial precursor/glial cells and by tangentially migrating as well as postmigratory neurons. We studied radially migrating neuroblasts in wild-type and Nogo-A knockout (KO) mouse embryos. In vitro analysis showed that Nogo-A and its receptor components NgR, Lingo-1, TROY, and p75 are expressed in cells emigrating from embryonic forebrain-derived neurospheres. Live imaging revealed an increased cell motility when Nogo-A was knocked out or blocked with antibodies. Antibodies blocking NgR or Lingo-1 showed the same motility-enhancing effect supporting a direct role of surface Nogo-A on migration. Bromodeoxyuridine (BrdU) labeling of embryonic day (E)15.5 embryos demonstrated that Nogo-A influences the radial migration of neuronal precursors. At E17.5, the normal transient accumulation of radially migrating precursors within the subventricular zone was not detectable in the Nogo-A KO mouse cortex. At E19, migration to the upper cortical layers was disturbed. These findings suggest that Nogo-A and its receptor complex play a role in the interplay of adhesive and repulsive cell interactions in radial migration during cortical development.

  16. Ontogeny of identified cells from the median domain in the embryonic brain of the grasshopper Schistocerca gregaria.

    Science.gov (United States)

    Boyan, George; Posser, Susanne; Ludwig, Peter; Güntner, Michaela; Williams, Lez

    2004-04-01

    In this paper, we propose an ontogeny for previously identified cells from the median domain in the midline of the embryonic brain of the grasshopper Schistocerca gregaria. The so-called lateral cells (LCs) are characteristically located laterally within the median domain at its border with the protocerebral hemispheres. The LC occurs singly and can be identified in the early embryo on the basis of their expression of the cell surface lipocalin Lazarillo. Using immunocytochemical, dye injection, electron microscopical and histological methods, we show that these LC are neurons and derive as postmitotic cells directly from the epithelium of the median domain. Further, they and the other identified cells of the median domain such as the protocerebral commissure pioneers (PCP), co-express the Mes-3 antigen, consistent with a derivation from the mesectodermal germ layer of the embryo. Subsequent to axogenesis, electron microscopy reveals that these Mes-3-expressing LC fasciculate with the co-expressing PCPs within the developing protocerebral commissure. We present a model for the origin of all these cells based on histological data and bromodeoxyuridine incorporation. The model suggests a delamination of cells from the mesectoderm followed by a migration to their ultimate sites within the median domain.

  17. All-trans retinoic acid (ATRA)-induced apoptosis is preceded by G1 arrest in human MCF-7 breast cancer cells.

    Science.gov (United States)

    Mangiarotti, R; Danova, M; Alberici, R; Pellicciari, C

    1998-01-01

    In this study the effects of all-trans retinoic acid (ATRA) on cell cycle and apoptosis of MCF-7 human breast cancer cells were investigated to elucidate the mechanisms underlying the antineoplastic potential of this retinoid in breast cancer. The antiproliferative effect of ATRA was evaluated by DNA content measurements and dual-parameter flow cytometry of bromodeoxyuridine (BrdU) incorporation and of the expression of cell cycle-related proteins (Ki-67 as proliferation marker and statin as quiescence marker) vs DNA content. Apoptosis was also studied by flow cytometry of either DNA content or Annexin V labelling. After 10(-6) M ATRA treatment, the fraction of S-phase cells decreased significantly, and cells accumulated in the G0/G1 range of DNA contents. Dual-parameter flow cytograms showed a decrease in the percentage of Ki-67-labelled cells (after 10 days, only 20% of the cells were still positive for Ki-67 compared with 95% in controls), while the fraction of statin-positive cells increased slightly. From 3 days of treatment onwards, apoptosis was found to occur. These results show that ATRA-induced inhibition of MCF-7 cell growth is related to two mechanisms, i.e. the block of cell proliferation, mostly in a pre-S phase, and the induction of apoptosis. These results should be taken into account when attempting to design treatment programmes that associate ATRA with antineoplastic compounds of different cell cycle specificity.

  18. Temporal and spatial distribution of metabotropic glutamate receptor 5 during development in the rat cortex and hippocampus

    Institute of Scientific and Technical Information of China (English)

    Xinli Xiao; Ming Hu; Pengbo Yang; Lin Zhang; Xinlin Chen; Yong Liu

    2011-01-01

    Metabotropic glutamate receptor 5 (mGluR5) is expressed by neurons in zones of active neurogenesis and is involved in the development of neural stem cells in vivo and in vitro. We examined the expression of mGluR5 in the cortex and hippocampus of rats during various prenatal and postnatal periods using immunohistochemistry. During prenatal development, mGluR5 was primarily localized to neuronal somas in the forebrain. During early postnatal periods, the receptor was mainly present on somas in the cortex. mGluR5 immunostaining was visible in apical dendrites and in the neuropil of neurons and persisted throughout postnatal development. During this period, pyramidal neurons were strongly labeled for the receptor. In the hippocampal CA1 region, mGluR5 immunoreactivity was more intense in the stratum oriens, stratum radiatum, and lacunosum moleculare at P0, P5 and P10 relative to P60. mGluR5 expression increased significantly in the molecular layer and decreased significantly in the granule cell layer of the dentate gyrus at P5, P10 and P60 in comparison with P0. Furthermore, some mGluR5-positive cells were also bromodeoxyuridine- or NeuroD-positive in the dentate gyrus at P14. These results demonstrate that mGluR5 has a differential expression pattern in the cortex and hippocampus during early growth, suggesting a role for this receptor in the control of domain specific brain developmental events.

  19. PROLIFERATION AND DIFFERENTIATION OF NEURAL STEM CELLS IN ADULT RATS AFTER CEREBRAL INFARCTION

    Institute of Scientific and Technical Information of China (English)

    Bo Zhang; Ren-zhi Wang; Yong Yao; Zhi-hai Liu; Zhi-gang Lian; Yu-jie Zou; Yu-kui Wei

    2004-01-01

    Objective To investigate proliferation and differentiation of neural stem cells in adult rats after cerebral infarction.Methods Models of cerebral infarction in rats were made and the time-course expression of bromodeoxyuridine (BrdU), Musashil, glial fibrillary acidic protein (GFAP), and neuronal nuclear antigen (NeuN) were determined by immunohistochemistry and immunofluorescence staining. BrdU and Musashil were used to mark dividing neural stem cells. GFAP and NeuN were used to mark differentiating neural stem cells.Results Compared with controls, the number of BrdU-labeled and BrdU-labeled with Musashil-positive cells increased strikingly 1 day after cerebral infarction; approximately 6 fold with a peak 7 days later; markedly decreased 14 days later, but was still elevated compared with that of controls; decling to the control level 28 days later. The number of BrdU-labeled with GFAP-positive cells nearly remained unchanged in the hippocampus after cerebral infarction. The number of BrdU-labeled with NeuN-positive cells increased strikingly 14 days after cerebral infarction, reached maximum peak in the hippocampus 28 days after cerebral infarction in rats.Conclusion Cerebral infarction stimulate proliferation of inherent neural stem cells and most proliferated neural stem cells differentiate into neurons.

  20. EXPERIMENTAL STUDY ON PLASTICITY OF PROLIFERATED NEURAL STEM CELLS IN ADULT RATS AFTER CEREBRAL INFARCTION

    Institute of Scientific and Technical Information of China (English)

    Bo Zhang; Ren-zhi Wang; Zhi-gang Lian; Yang Song; Yong Yao

    2006-01-01

    Objective To investigate whether there is endogenous neural stem cell proliferation and whether these proliferated neural stem cells represent neural plasticity in the adult rats after cerebral infarction.Methods Cerebral infarction models of rats were established and the dynamic expression of bromodeoxyuridine (BrdU), BrdU/polysialylated neural cell adhesion molecule (PSA-NCAM) were determined by immunohistochemistry and immunofluorescence staining. BrdU was used to mark dividing neural stem cells. PSA-NCAM was used to mark the plasticity of neural stem cells.Results Compared with controls, the number of BrdU-positive cells in the subventricular zone (SVZ) and hippocampus increased significantly at 1st day after cerebral infarction (P<0.05), reached maximum at 7th day, decreased markedly at 14th day, but it was still elevated compared with that of the controls (P<0.05). The number of BrdU-labeled with PSA-NCAM-positive cells increased significantly at 7th day (P<0.05 ), reached maximum at 14th day,markedly decreased at 28th day, but it was still elevated compared with that of the controls (P<0.05). It was equal to 60% of the number of BrdU-positive cells in the same period.Conclusion Cerebral infarction may stimulate the proliferation of endogenous neural stem cells in situ and most proliferated neural stem cells represent neural plasticity.

  1. Increased cardiac workload by closure of the ductus arteriosus leads to hypertrophy and apoptosis rather than to hyperplasia in the late fetal period.

    Science.gov (United States)

    van den Hoff, Maurice J B; Deprez, Ronald H Lekanne; Ruijter, Jan M; de Boer, Piet A J; Tesink-Taekema, Sabina; Buffing, Anita A; Lamers, Wouter H; Moorman, Antoon F M

    2004-09-01

    It is generally thought that adult mammalian cardiomyocytes compensate for an increased workload by hypertrophy, whereas fetal myocardium grows by cellular proliferation. We analyzed the response of late-fetal rat hearts upon an increased workload imposed by premature constriction of the ductus arteriosus with indomethacin. Initially the fetal heart responds by proliferative growth, as both wet weight and labeling index (bromodeoxyuridine incorporation) of the ventricles increased, whereas neither a change in the fibroblast fraction, ploidy and nucleation in the ventricles is observed. However, this hyperplastic growth is abrogated by a subsequent burst in apoptosis and followed by a hypertrophic response as based on a decrease in DNA and increase in both RNA and protein concentration. This hypertrophic growth was accompanied by a 1.4-fold increase in the volume of the cardiomyocytes. Changes in the molecular phenotype characteristic of pressure-overload hypertrophic growth accompany the process. Thus, the levels of expression of beta-myosin heavy chain and atrial natriuretic factor mRNA increased, of sarcoplasmic/endoplasmic reticulum ATPase (SERCA2) mRNA decreased, and of alpha-myosin heavy chain, phospholamban, and calsequestrin mRNA did not change. In situ hybridization showed that the pattern of mRNA expression changed first in the right ventricular wall and subsequently in the left ventricular free wall as well. It is concluded that pressure-overload imposed on the late-fetal heart induces limited proliferative growth complemented by extensive hypertrophic growth.

  2. Terutroban, a thromboxane/prostaglandin endoperoxide receptor antagonist, prevents hypertensive vascular hypertrophy and fibrosis.

    Science.gov (United States)

    Gelosa, Paolo; Sevin, Gulnur; Pignieri, Alice; Budelli, Silvia; Castiglioni, Laura; Blanc-Guillemaud, Vanessa; Lerond, Laurence; Tremoli, Elena; Sironi, Luigi

    2011-03-01

    Thromboxane A(2) and other eicosanoids such as isoprostanes contribute to vascular proliferation and atherosclerosis by binding to the thromboxane/prostaglandin endoperoxide receptors. The effects of terutroban, a thromboxane/prostaglandin endoperoxide receptor antagonist, on aorta remodeling were evaluated in spontaneously hypertensive stroke-prone rats (SHRSPs), a model of severe hypertension, endothelial dysfunction, vascular inflammation, and cerebrovascular diseases. Male SHRSPs were allocated to three groups receiving a standard diet (n = 5) or a high-sodium permissive diet plus vehicle (n = 6) or plus terutroban (30 mg · kg(-1) · day(-1); n = 6). After 6 wk of dietary treatment, all of the animals were injected with bromodeoxyuridine and simultaneously euthanized for aorta collection. The aortic media thickness-to-lumen ratio significantly (P hyperplasia and has beneficial effects on fibrotic processes by affecting TGF-β and heat shock protein-47 expression in SHRSPs. These findings provide mechanistic data supporting the beneficial effects of terutroban in preventing or retarding atherogenesis.

  3. Chemically-enzymatic synthesis of photosensitive DNA.

    Science.gov (United States)

    Westphal, Kinga; Zdrowowicz, Magdalena; Zylicz-Stachula, Agnieszka; Rak, Janusz

    2017-02-01

    The sensitizing propensity of radio-/photosensitizing nucleoside depends on DNA sequence surrounding a sensitizer. Therefore, in order to compare sensitizers with regard to their ability to induce a DNA damage one has to study the sequence dependence of damage yield. However, chemical synthesis of oligonucleotides labeled with sensitizing nucleosides is hindered due to the fact that a limited number of such nucleoside phosphoramidites are accessible. Here, we report on a chemically-enzymatic method, employing a DNA polymerase and ligase, that enables a modified nucleoside, in the form of its 5'-triphosphate, to be incorporated into DNA fragment in a pre-determined site. Using such a protocol two double-stranded DNA fragments - a long one, 75 base pairs (bp), and a short one, 30bp in length - were pin-point labeled with 5-bromodeoxyuridine. Four DNA polymerases together with DHPLC for the inspection of reaction progress were used to optimize the process under consideration. As an ultimate test showing that the product possessing an assumed nucleotide sequence was actually obtained, we irradiated the synthesized oligonucleotide with UVB photons and analyzed its photoreactivity with the LC-MS method. Our results prove that a general approach enabling precise labeling of DNA with any nucleoside modification processed by DNA polymerase and ligase has been worked out.

  4. Expression, biosynthesis and release of preadipocyte factor-1/ delta-like protein/fetal antigen-1 in pancreatic beta-cells

    DEFF Research Database (Denmark)

    Friedrichsen, B N; Carlsson, C; Møldrup, Annette

    2003-01-01

    and the ovaries. We have previously cloned Pref-1 from neonatal rat islets stimulated by GH. The aim of the present study was to elucidate the biosynthesis and release of Pref-1/FA1 in beta-cells and to determine if Pref-1/FA1 is mediating the mitogenic effect of GH in insulin-producing cells. First we studied...... the biosynthesis and processing of Pref-1 to the soluble form, FA1, in pancreatic islets and insulinoma cells transfected with Pref-1 cDNA. We measured the release of FA1 by ELISA and the possible effect of FA1 in GH-stimulated beta-cell proliferation by incorporation of bromodeoxyuridine (BrdU) in insulin...... that FA1 is regulated by glucose. Neither FA1 nor conditioned medium from GH-stimulated islets depleted for GH was able to increase beta-cell replication and overexpression of Pref-1 resulted in attenuated proliferation of the RINm5F cells. By immunocytochemistry of GH-stimulated islet cells...

  5. Effect of Low Power Laser Irradiation on the Ability of Cell Growth and Myogenic Differentiation of Myoblasts Cultured In Vitro

    Directory of Open Access Journals (Sweden)

    Cui-Ping Zhang

    2014-01-01

    Full Text Available As a therapeutic modality, low power laser irradiation (LPLI has been used clinically in the treatment of skeletal muscle injuries and other myopathic conditions, but the cellular and molecular mechanisms attributed to this therapy were still unclear. Myoblasts are a type of myogenic stem cells quiescence in mature skeletal muscle fibers and are considered as the source cells during the regenerating process. The purpose of this paper was to investigate the effects of LPLI on the proliferation and myogenic differentiation of the cultured myoblasts and to find out the major candidates responsible for LPLI-induced muscle regeneration in vivo. In this study, primary rat myoblasts were exposed to helium-neon (He-Ne laser. Cell proliferation, differentiation, and the cellular responses to LPLI were monitored by using morphological observation and molecular biological methods. It was found that LPLI at a certain fluence could increase the cell growth potential for myoblasts and further induce more cells entering into S phase of the mitotic cycle as indicated by high levels of bromodeoxyuridine (BrdU incorporation, while at the same time inhibiting their in vitro differentiation and decreasing the expression of myogenic regulatory genes to a certain extent. Taken together, these results provide experimental evidence for the clinical applications of LPLI in regenerating skeletal muscle.

  6. 3-[3-(3-florophenyl-2-propyn-1-ylthio)-1, 2, 5-thiadiazol-4-yl]-1, 2, 5, 6-tetrahydro-1- methylpyridine oxalate, a novel xanomeline derivative, improves neural cells proliferation and survival in adult mice

    Institute of Scientific and Technical Information of China (English)

    Xiaoliang Zhang; Qiang Gong; Shuang Zhang; Lin Wang; Yinghe Hu; Haiming Shen; Suzhen Dong

    2012-01-01

    The present study analyzed the influence of 3-[3-(3-florophenyl-2-propyn-1-ylthio)-1, 2, 5-thiadiazol-4-yl]-1, 2, 5, 6-tetrahydro-1-methylpyridine oxalate (EUK1001), a novel xanomeline derivative of the M1/M4 receptor agonist, on hippocampal neurogenesis in adult C57BL6 mice. Results showed that 15-day EUK1001 treatment via intraperitoneal injection promoted neural cell proliferation in the dentate gyrus, although cell differentiation did not change. The majority of bromodeoxyuridine-positive cells co-expressed the immature neuronal marker doublecortin. In addition, the level of neurogenesis in the subventricular zone was not altered. Brain-derived neurotrophic factor mRNA expression was up-regulated following EUK1001 treatment, but no change was observed in expression of camp-responsive element binding protein 1, paired box gene 6, vascular endothelial growth factor alpha, neurogenic differentiation factor 1, and wingless-related mouse mammary tumor virus integration site 3A mRNA. These experimental findings indicated that EUK1001 enhanced proliferation and survival of hippocampal cells, possibly by increasing brain-derived neurotrophic factor expression.

  7. Differential regulation of vitamin D receptor expression in distinct leukemic cell lines upon phorbol ester-induced growth arrest

    Directory of Open Access Journals (Sweden)

    Folgueira M.A.A.K.

    2000-01-01

    Full Text Available A close correlation between vitamin D receptor (VDR abundance and cell proliferation rate has been shown in NIH-3T3 fibroblasts, MCF-7 breast cancer and in HL-60 myeloblastic cells. We have now determined if this association occurs in other leukemic cell lines, U937 and K562, and if VDR content is related to c-myc expression, which is also linked to cell growth state. Upon phorbol myristate acetate (PMA treatment, cells from the three lineages (HL-60, U937 and K562 differentiated and expressed specific surface antigens. All cell lines analyzed were growth inhibited by PMA and the doubling time was increased, mainly due to an increased fraction of cells in the G0/G1 phase, as determined by flow cytometry measurements of incorporated bromodeoxyuridine and cell DNA content. C-myc mRNA expression was down-regulated and closely correlated to cell growth arrest. However, VDR expression in leukemic cell lines, as determined by immunofluorescence and Northern blot assays, was not consistently changed upon inhibition of cell proliferation since VDR levels were down-regulated only in HL-60 cells. Our data suggest that VDR expression cannot be explained simply as a reflection of the leukemic cell growth state.

  8. Evaluation of the effect of the concentration of plasticizer di(2-ethylhexyl) phthalate on the quantity of residual monomer vinyl chloride in PVC chest drainage tubes.

    Science.gov (United States)

    Kicheva, Y I; Richter, H; Popova, E

    2004-08-01

    The effect of amount of plasticizer di(2-ethylhexyl) phthalate (DEHP) amount on the amount of residual monomer vinyl chloride (VC) was determined in samples of plasticised polyvinyl chloride (PVC) with different concentration of plasticiser (22.32-33.05%), before and after sterilisation by a titrimetric method. The titrimetric method was used to determine the VC concentration in a KMnO4 solution where the samples were kept immersed under the same conditions for 2 h. The influence of PVC film extracts with different amounts of DEHP on mouse fibroblast cells L-929 in a culture medium was evaluated by using quantitative tests: the amount of cells (protein determination), viability (MTT test) and proliferation (incorporation of bromodeoxyuridine (BrDU). The amount of vinyl chloride before and after heat sterilisation at 120 degrees C for 30 min was found to be almost the same for all samples and without any dependence on the concentration of DEHP. The extracts of the PVC films which were tested have no toxic effect on cells in a culture medium.

  9. Original and regenerating lizard tail cartilage contain putative resident stem/progenitor cells.

    Science.gov (United States)

    Alibardi, Lorenzo

    2015-11-01

    Regeneration of cartilaginous tissues is limited in mammals but it occurs with variable extension in lizards (reptiles), including in their vertebrae. The ability of lizard vertebrae to regenerate cartilaginous tissue that is later replaced with bone has been analyzed using tritiated thymidine autoradiography and 5BrdU immunocytochemistry after single pulse or prolonged-pulse and chase experiments. The massive cartilage regeneration that can restore broad vertebral regions and gives rise to a long cartilaginous tube in the regenerating tail, depends from the permanence of some chondrogenic cells within adult vertebrae. Few cells that retain tritiated thymidine or 5-bromodeoxy-uridine for over 35 days are mainly localized in the inter-vertebral cartilage and in sparse chondrogenic regions of the neural arch of the vertebrae, suggesting that they are putative resident stem/progenitor cells. The study supports previous hypothesis indicating that the massive regeneration of the cartilaginous tissue in damaged vertebrae and in the regenerating tail of lizards derive from resident stem cells mainly present in the cartilaginous areas of the vertebrae including in the perichondrium that are retained in adult lizards as growing centers for most of their lifetime.

  10. Fmr1 knockout mice show reduced anxiety and alterations in neurogenesis that are specific to the ventral dentate gyrus.

    Science.gov (United States)

    Eadie, B D; Zhang, W N; Boehme, F; Gil-Mohapel, J; Kainer, L; Simpson, J M; Christie, B R

    2009-11-01

    Fragile X syndrome (FXS) is a neurodevelopmental disorder caused by the selective loss of the expression of the Fmr1 gene. Key symptoms in FXS include intellectual impairment and abnormal anxiety-related behaviors. Fmr1 knockout (KO) mice exhibited reduced anxiety on two behavioral tests as well as a blunted corticosterone response to acute stress. Spatial learning and memory was not impaired when tested with both the classic Morris water and Plus-shaped mazes. Adult hippocampal neurogenesis has been associated with spatial learning and memory and emotions such as anxiety and depression. The process of neurogenesis appears abnormal in young adult Fmr1 KO mice, with significantly fewer bromodeoxyuridine-positive cells surviving for at least 4 weeks in the ventral subregion of the dentate gyrus (DG), a hippocampal subregion more closely associated with emotion than the dorsal DG. Within this smaller pool of surviving cells, we observed a concomitant increase in the proportion of surviving cells that acquire a neuronal phenotype. We did not observe a clear difference in cell proliferation using both endogenous and exogenous markers. This work indicates that loss of Fmr1 expression can alter anxiety-related behaviors in mice as well as produce region-specific alterations in hippocampal adult neurogenesis.

  11. In vivo transfer of intracellular labels from locally implanted bone marrow stromal cells to resident tissue macrophages.

    Directory of Open Access Journals (Sweden)

    Edyta Pawelczyk

    Full Text Available Intracellular labels such as dextran coated superparamagnetic iron oxide nanoparticles (SPION, bromodeoxyuridine (BrdU or green fluorescent protein (GFP are frequently used to study the fate of transplanted cells by in vivo magnetic resonance imaging or fluorescent microscopy. Bystander uptake of labeled cells by resident tissue macrophages (TM can confound the interpretation of the presence of intracellular labels especially during direct implantation of cells, which can result in more than 70% cell death. In this study we determined the percentages of TM that took up SPION, BrdU or GFP from labeled bone marrow stromal cells (BMSCs that were placed into areas of angiogenesis and inflammation in a mouse model known as Matrigel plaque perfusion assay. Cells recovered from digested plaques at various time points were analyzed by fluorescence microscopy and flow cytometry. The analysis of harvested plaques revealed 5% of BrdU(+, 5-10% of GFP(+ and 5-15% of dextran(+ macrophages. The transfer of the label was not dependent on cell dose or viability. Collectively, this study suggests that care should be taken to validate donor origin of cells using an independent marker by histology and to assess transplanted cells for TM markers prior to drawing conclusions about the in vivo behavior of transplanted cells.

  12. Early postnatal respiratory viral infection alters hippocampal neurogenesis, cell fate, and neuron morphology in the neonatal piglet.

    Science.gov (United States)

    Conrad, Matthew S; Harasim, Samantha; Rhodes, Justin S; Van Alstine, William G; Johnson, Rodney W

    2015-02-01

    Respiratory viral infections are common during the neonatal period in humans, but little is known about how early-life infection impacts brain development. The current study used a neonatal piglet model as piglets have a gyrencephalic brain with growth and development similar to human infants. Piglets were inoculated with porcine reproductive and respiratory syndrome virus (PRRSV) to evaluate how chronic neuroinflammation affects hippocampal neurogenesis and neuron morphology. Piglets in the neurogenesis study received one bromodeoxyuridine injection on postnatal day (PD) 7 and then were inoculated with PRRSV. Piglets were sacrificed at PD 28 and the number of BrdU+ cells and cell fate were quantified in the dentate gyrus. PRRSV piglets showed a 24% reduction in the number of newly divided cells forming neurons. Approximately 15% of newly divided cells formed microglia, but this was not affected by sex or PRRSV. Additionally, there was a sexual dimorphism of new cell survival in the dentate gyrus where males had more cells than females, and PRRSV infection caused a decreased survival in males only. Golgi impregnation was used to characterize dentate granule cell morphology. Sholl analysis revealed that PRRSV caused a change in inner granule cell morphology where the first branch point was extended further from the cell body. Males had more complex dendritic arbors than females in the outer granule cell layer, but this was not affected by PRRSV. There were no changes to dendritic spine density or morphology distribution. These findings suggest that early-life viral infection can impact brain development.

  13. Influence of chronic cocaine treatment and sleep deprivation on sexual behavior and neurogenesis of the male rat.

    Science.gov (United States)

    Andersen, Monica L; Perry, Juliana C; Bignotto, Magda; Perez-Mendes, Patricia; Cinini, Simone M; Mello, Luiz E A; Tufik, Sergio

    2007-08-15

    The present study investigated the influence of chronic cocaine treatment on genital reflexes associated with paradoxical sleep deprivation (PSD), and possible alterations in hippocampus neurogenesis of the male rat. At 21 days of age, the rats were distributed into two groups and injected with saline or cocaine (7 mg/kg, three times a week for 12 weeks). At age 90 days, they were submitted to a four-day period of PSD (PSD groups) or maintained in home-cages (control groups), challenged with saline or cocaine administration, and placed in observation cages to assess genital reflexes. Two additional groups were used to quantify neurogenesis. PSD rats treated chronically with cocaine and challenged with saline did not differ from their respective control groups. The association of PSD with cocaine potentiated penile erection (PE) when compared to PSD-saline (saline challenged) rats, and these effects were similar to those observed in long-term cocaine treated rats. The bromodeoxyuridine (BrdU) assay indicated a reduction in BrdU-positive cells in the adult hippocampus after chronic cocaine treatment. These findings show that long-term cocaine treatment from brain development through adulthood had a marked effect on sexual responses and neuronal proliferation.

  14. Bone and cartilage changes in rabbit mandibular condyles after a single injection of botulinum toxin

    Science.gov (United States)

    Matthys, Tori; Ho Dang, Hong An; Rafferty, Katherine L.; Herring, Susan W.

    2015-01-01

    Introduction Temporary paralysis of the masseter muscle using botulinum toxin is a common treatment for temporomandibular disorders, bruxism, and muscle hypertrophy. Loss of masseter force is associated with decreased mandibular mineral density. Our objectives were (1) to establish whether bone loss at the mandibular condyle is regionally specific, and (2) to ascertain whether the treatment affects the condylar cartilage. Methods Young adult female rabbits received a unilateral masseter injection of botulinum neurotoxin serotype A (BoNT/A, n=31), saline (n=19) or no injection (n=3) and were also injected with bromodeoxyuridine (BrdU), a replication marker. Termination occurred 4 or 12 weeks following treatment. Condyles were processed by paraffin histology. Cortical thickness, cartilage thickness and trabecular bone areal density were measured, and replicating cells were counted after BrdU reaction. Results BoNT/A rabbits exhibited a high frequency of defects in the condylar bone surface, occurring equally on injected and uninjected sides. Bone loss was seen only on the side of the BoNT/A injection. Cortical as well as trabecular bone was severely affected. The midcondylar region lost the most bone. Recovery at 12 weeks was insignificant. Condylar cartilage thickness showed no treatment effect but did increase with time. Numbers of proliferating cells were similar in treatment groups, but BoNT/A animals showed more side asymmetry in association with the condylar defects. Conclusion Bone loss may be a risk factor for the use of botulinum toxin in jaw muscles. PMID:26672706

  15. The glucagon-like peptide 1 receptor agonist exendin-4 improves reference memory performance and decreases immobility in the forced swim test.

    Science.gov (United States)

    Isacson, Ruben; Nielsen, Elisabet; Dannaeus, Karin; Bertilsson, Göran; Patrone, Cesare; Zachrisson, Olof; Wikström, Lilian

    2011-01-10

    We have earlier shown that the glucagon-like peptide 1 receptor agonist exendin-4 stimulates neurogenesis in the subventricular zone and excerts anti-parkinsonian behavior. The aim of this study was to assess the effects of exendin-4 treatment on hippocampus-associated cognitive and mood-related behavior in adult rodents. To investigate potential effects of exendin-4 on hippocampal function, radial maze and forced swim test were employed. The time necessary to solve a radial maze task and the duration of immobility in the forced swim test were significantly reduced compared to respective vehicle groups if the animals had received exendin-4 during 1-2weeks before testing. In contrast to the positive control imipramine, single administration of exendin-4 1h before the challenge in the forced swim test had no effect. Immunohistochemical analysis showed that the incorporation of bromodeoxyuridine, a marker for DNA synthesis, as well as doublecortin expression was increased in the hippocampal dentate gyrus following chronic treatment with exendin-4 compared to vehicle-treated controls. The neurogenic effect of exendin-4 on hippocampus was confirmed by quantitative PCR showing an upregulation of mRNA expression for Ki-67, doublecortin and Mash-1. Since exendin-4 significantly improves hippocampus-associated behavior in adult rodents, it may be a candidate for alleviation of mood and cognitive disorders.

  16. High-frequency stimulation induces gradual immediate early gene expression in maturing adult-generated hippocampal granule cells.

    Science.gov (United States)

    Jungenitz, Tassilo; Radic, Tijana; Jedlicka, Peter; Schwarzacher, Stephan W

    2014-07-01

    Increasing evidence shows that adult neurogenesis of hippocampal granule cells is advantageous for learning and memory. We examined at which stage of structural maturation and age new granule cells can be activated by strong synaptic stimulation. High-frequency stimulation of the perforant pathway in urethane-anesthetized rats elicited expression of the immediate early genes c-fos, Arc, zif268 and pCREB133 in almost 100% of mature, calbindin-positive granule cells. In contrast, it failed to induce immediate early gene expression in immature doublecortin-positive granule cells. Furthermore, doublecortin-positive neurons did not react with c-fos or Arc expression to mild theta-burst stimulation or novel environment exposure. Endogenous expression of pCREB133 was increasingly present in young cells with more elaborated dendrites, revealing a close correlation to structural maturation. Labeling with bromodeoxyuridine revealed cell age dependence of stimulation-induced c-fos, Arc and zif268 expression, with only a few cells reacting at 21 days, but with up to 75% of cells activated at 35-77 days of cell age. Our results indicate an increasing synaptic integration of maturing granule cells, starting at 21 days of cell age, but suggest a lack of ability to respond to activation with synaptic potentiation on the transcriptional level as long as immature cells express doublecortin.

  17. Intracerebroventricular administration of nerve growth factor induces gliogenesis in sensory ganglia, dorsal root, and within the dorsal root entry zone.

    Science.gov (United States)

    Schlachetzki, Johannes C M; Pizzo, Donald P; Morrissette, Debbi A; Winkler, Jürgen

    2014-01-01

    Previous studies indicated that intracerebroventricular administration of nerve growth factor (NGF) leads to massive Schwann cell hyperplasia surrounding the medulla oblongata and spinal cord. This study was designed to characterize the proliferation of peripheral glial cells, that is, Schwann and satellite cells, in the trigeminal ganglia and dorsal root ganglia (DRG) of adult rats during two weeks of NGF infusion using bromodeoxyuridine (BrdU) to label dividing cells. The trigeminal ganglia as well as the cervical and lumbar DRG were analyzed. Along the entire neuraxis a small number of dividing cells were observed within these regions under physiological condition. NGF infusion has dramatically increased the generation of new cells in the neuronal soma and axonal compartments of sensory ganglia and along the dorsal root and the dorsal root entry zone. Quantification of BrdU positive cells within sensory ganglia revealed a 2.3- to 3-fold increase in glial cells compared to controls with a similar response to NGF for the different peripheral ganglia examined. Immunofluorescent labeling with S100β revealed that Schwann and satellite cells underwent mitosis after NGF administration. These data indicate that intracerebroventricular NGF infusion significantly induces gliogenesis in trigeminal ganglia and the spinal sensory ganglia and along the dorsal root entry zone as well as the dorsal root.

  18. Intracerebroventricular Administration of Nerve Growth Factor Induces Gliogenesis in Sensory Ganglia, Dorsal Root, and within the Dorsal Root Entry Zone

    Directory of Open Access Journals (Sweden)

    Johannes C. M. Schlachetzki

    2014-01-01

    Full Text Available Previous studies indicated that intracerebroventricular administration of nerve growth factor (NGF leads to massive Schwann cell hyperplasia surrounding the medulla oblongata and spinal cord. This study was designed to characterize the proliferation of peripheral glial cells, that is, Schwann and satellite cells, in the trigeminal ganglia and dorsal root ganglia (DRG of adult rats during two weeks of NGF infusion using bromodeoxyuridine (BrdU to label dividing cells. The trigeminal ganglia as well as the cervical and lumbar DRG were analyzed. Along the entire neuraxis a small number of dividing cells were observed within these regions under physiological condition. NGF infusion has dramatically increased the generation of new cells in the neuronal soma and axonal compartments of sensory ganglia and along the dorsal root and the dorsal root entry zone. Quantification of BrdU positive cells within sensory ganglia revealed a 2.3- to 3-fold increase in glial cells compared to controls with a similar response to NGF for the different peripheral ganglia examined. Immunofluorescent labeling with S100β revealed that Schwann and satellite cells underwent mitosis after NGF administration. These data indicate that intracerebroventricular NGF infusion significantly induces gliogenesis in trigeminal ganglia and the spinal sensory ganglia and along the dorsal root entry zone as well as the dorsal root.

  19. Evaluation of silicon nitride as a substrate for culture of PC12 cells: an interfacial model for functional studies in neurons.

    Directory of Open Access Journals (Sweden)

    Johan Jaime Medina Benavente

    Full Text Available Silicon nitride is a biocompatible material that is currently used as an interfacial surface between cells and large-scale integration devices incorporating ion-sensitive field-effect transistor technology. Here, we investigated whether a poly-L-lysine coated silicon nitride surface is suitable for the culture of PC12 cells, which are widely used as a model for neural differentiation, and we characterized their interaction based on cell behavior when seeded on the tested material. The coated surface was first examined in terms of wettability and topography using contact angle measurements and atomic force microscopy and then, conditioned silicon nitride surface was used as the substrate for the study of PC12 cell culture properties. We found that coating silicon nitride with poly-L-lysine increased surface hydrophilicity and that exposing this coated surface to an extracellular aqueous environment gradually decreased its roughness. When PC12 cells were cultured on a coated silicon nitride surface, adhesion and spreading were facilitated, and the cells showed enhanced morphological differentiation compared to those cultured on a plastic culture dish. A bromodeoxyuridine assay demonstrated that, on the coated silicon nitride surface, higher proportions of cells left the cell cycle, remained in a quiescent state and had longer survival times. Therefore, our study of the interaction of the silicon nitride surface with PC12 cells provides important information for the production of devices that need to have optimal cell culture-supporting properties in order to be used in the study of neuronal functions.

  20. Impaired adult olfactory bulb neurogenesis in the R6/2 mouse model of Huntington's disease

    Directory of Open Access Journals (Sweden)

    Kohl Zacharias

    2010-09-01

    Full Text Available Abstract Background Huntington's disease (HD is an autosomal dominant neurodegenerative disorder linked to expanded CAG-triplet nucleotide repeats within the huntingtin gene. Intracellular huntingtin aggregates are present in neurons of distinct brain areas, among them regions of adult neurogenesis including the hippocampus and the subventricular zone/olfactory bulb system. Previously, reduced hippocampal neurogenesis has been detected in transgenic rodent models of HD. Therefore, we hypothesized that mutant huntingtin also affects newly generated neurons derived from the subventricular zone of adult R6/2 HD mice. Results We observed a redirection of immature neuroblasts towards the striatum, however failed to detect new mature neurons. We further analyzed adult neurogenesis in the granular cell layer and the glomerular layer of the olfactory bulb, the physiological target region of subventricular zone-derived neuroblasts. Using bromodeoxyuridine to label proliferating cells, we observed in both neurogenic regions of the olfactory bulb a reduction in newly generated neurons. Conclusion These findings suggest that the striatal environment, severely affected in R6/2 mice, is capable of attracting neuroblasts, however this region fails to provide sufficient signals for neuronal maturation. Moreover, in transgenic R6/2 animals, the hostile huntingtin-associated microenvironment in the olfactory bulb interferes with the survival and integration of new mature neurons. Taken together, endogenous cell repair strategies in HD may require additional factors for the differentiation and survival of newly generated neurons both in neurogenic and non-neurogenic regions.

  1. Effects of enriched physical and social environments on motor performance, associative learning, and hippocampal neurogenesis in mice.

    Science.gov (United States)

    Madroñal, Noelia; López-Aracil, Cristina; Rangel, Alejandra; del Río, José A; Delgado-García, José M; Gruart, Agnès

    2010-06-15

    We have studied the motor abilities and associative learning capabilities of adult mice placed in different enriched environments. Three-month-old animals were maintained for a month alone (AL), alone in a physically enriched environment (PHY), and, finally, in groups in the absence (SO) or presence (SOPHY) of an enriched environment. The animals' capabilities were subsequently checked in the rotarod test, and for classical and instrumental learning. The PHY and SOPHY groups presented better performances in the rotarod test and in the acquisition of the instrumental learning task. In contrast, no significant differences between groups were observed for classical eyeblink conditioning. The four groups presented similar increases in the strength of field EPSPs (fEPSPs) evoked at the hippocampal CA3-CA1 synapse across classical conditioning sessions, with no significant differences between groups. These trained animals were pulse-injected with bromodeoxyuridine (BrdU) to determine hippocampal neurogenesis. No significant differences were found in the number of NeuN/BrdU double-labeled neurons. We repeated the same BrdU study in one-month-old mice raised for an additional month in the above-mentioned four different environments. These animals were not submitted to rotarod or conditioned tests. Non-trained PHY and SOPHY groups presented more neurogenesis than the other two groups. Thus, neurogenesis seems to be related to physical enrichment at early ages, but not to learning acquisition in adult mice.

  2. Delay in maturation of the submandibular gland in Chagas disease correlates with lower DNA synthesis

    Directory of Open Access Journals (Sweden)

    José B Alves

    2008-09-01

    Full Text Available It has been demonstrated that the acute phase of Trypanosoma cruzi infection promotes several changes in the oral glands. The present study examined whether T. cruzi modulates the expression of host cell apoptotic or mitotic pathway genes. Rats were infected with T. cruzi then sacrificed after 18, 32, 64 or 97 days, after which the submandibular glands were analyzed by immunohistochemistry. Immunohistochemical analyses using an anti-bromodeoxyuridine antibody showed that, during acute T. cruzi infection, DNA synthesizing cells in rat submandibular glands were lower than in non-infected animals (p < 0.05. However, after 64 days of infection (chronic phase, the number of immunolabeled cells are similar in both groups. However, immunohistochemical analysis of Fas and Bcl-2 expression did not find any difference between infected and non-infected animals in both the acute and chronic stages. These findings suggest that the delay in ductal maturation observed at the acute phase of Chagas disease is correlated with lower expression of DNA synthesis genes, but not apoptotic genes.

  3. Reduction of UV-induced mitotic delay by caffeine in BUdR-substituted plasmodia of Physarum polycephalum.

    Science.gov (United States)

    Jayasree, P R; Nair, V R

    1993-02-01

    Chromosomal DNA of the synchronously mitotic plasmodia of P. polycephalum was substituted with 5-bromo-2'-deoxyuridine, by growing the plasmodia during S phase, on a medium containing this nucleoside analog. A strong synergism was observed between bromodeoxyuridine and UV-irradiation, in late G2-irradiated plasmodia in that, the mitotic delay obtained in them was much more than a simple sum of the delays induced by these two agents individually. It was also observed that the mitotic delay in this system is reduced significantly by different concentrations of caffeine applied immediately after irradiation and there was a stage specificity in this effect. The reduction in mitotic delay was maximum (80%) in those plasmodia irradiated 20-30 min before control metaphase, when mitogenic factors also reach their maximum activity in this system. It is proposed that the mitotic delay reducing effect of caffeine is due to its ability to promote the activity of the mitogenic factors, largely independent of the system which is responsible for monitoring the state of the chromosomal DNA.

  4. The Drosophila deoxyhypusine hydroxylase homologue nero and its target eIF5A are required for cell growth and the regulation of autophagy.

    Science.gov (United States)

    Patel, Prajal H; Costa-Mattioli, Mauro; Schulze, Karen L; Bellen, Hugo J

    2009-06-29

    Hypusination is a unique posttranslational modification by which lysine is transformed into the atypical amino acid hypusine. eIF5A (eukaryotic initiation factor 5A) is the only known protein to contain hypusine. In this study, we describe the identification and characterization of nero, the Drosophila melanogaster deoxyhypusine hydroxylase (DOHH) homologue. nero mutations affect cell and organ size, bromodeoxyuridine incorporation, and autophagy. Knockdown of the hypusination target eIF5A via RNA interference causes phenotypes similar to nero mutations. However, loss of nero appears to cause milder phenotypes than loss of eIF5A. This is partially explained through a potential compensatory mechanism by which nero mutant cells up-regulate eIF5A levels. The failure of eIF5A up-regulation to rescue nero mutant phenotypes suggests that hypusination is required for eIF5A function. Furthermore, expression of enzymatically impaired forms of DOHH fails to rescue nero clones, indicating that hypusination activity is important for nero function. Our data also indicate that nero and eIF5A are required for cell growth and affect autophagy and protein synthesis.

  5. Bid protects the mouse hematopoietic system following hydroxyurea-induced replicative stress.

    Science.gov (United States)

    Liu, Y; Aiello, A; Zinkel, S S

    2012-10-01

    Hematopoietic stem cells (HSCs) possess long-term self-renewal capacity and multipotent differentiative capacity, to maintain the hematopoietic system. Long-term hematopoietic homeostasis requires effective control of genotoxic damage to maintain HSC function and prevent propagation of deleterious mutations. Here we investigate the role of the BH3-only Bcl-2 family member Bid in the response of murine hematopoietic cells to long-term replicative stress induced by hydroxyurea (HU). The PI3-like serine/threonine kinase, ATR, initiates the DNA damage response (DDR) to replicative stress. The pro-apoptotic Bcl-2 family member, Bid, facilitates this response to replicative stress in hematopoietic cells, but the in vivo role of this DDR function of Bid has not been defined. Surprisingly, we demonstrate that long-term HU treatment expands wild-type myeloid progenitor cells (MPCs) and HSC-enriched Lin(-)Sca1(+)Kit(+) (LSK) cells to maintain bone marrow function as measured by long-term competitive repopulating ability. Bid-/- MPCs demonstrate increased sensitivity to HU and are depleted. Bid-/- LSK cells demonstrate increased mobilization manifest by increased Bromodeoxyuridine (BrdU) incorporation. Bid-/- MPCs and LSK cells are relatively depleted, however, and bone marrow from Bid-/- mice demonstrates decreased long-term competitive repopulating ability in both primary and secondary transplants. We thus describe a survival function of Bid in hematopoiesis in the setting of chronic replicative stress.

  6. Stem cells in the adult rat spinal cord: plasticity after injury and treadmill training exercise.

    Science.gov (United States)

    Foret, Ariane; Quertainmont, Renaud; Botman, Olivier; Bouhy, Delphine; Amabili, Philippe; Brook, Gary; Schoenen, Jean; Franzen, Rachelle

    2010-02-01

    Ependymal cells located around the central canal of the adult spinal cord are considered as a source of neural stem cells (NSCs) and represent an interesting pool of endogenous stem cells for repair strategies. Physical exercise is known to increase ependymal cell proliferation, while improving functional recovery. In this work, we further characterized those endogenous NSCs within the normal and injured adult rat spinal cord and investigated the effects of treadmill training using immunohistochemical and behavioral studies. In uninjured untrained rats, Sox-2, a NSC marker, was detected in all ependymal cells of the central canal, and also scattered throughout the parenchyma of the spinal cord. Within the lesion, Sox-2 expression increased transiently, while the number of nestin-positive ependymal cells increased with a concomitant enhancement of proliferation, as indicated by the mitotic markers Ki67 and bromo-deoxyuridine. Exercise, which improved functional recovery and autonomous micturition, maintained nestin expression in both injured and uninjured spinal cords, with a positive correlation between locomotor recovery and the number of nestin-positive cells.

  7. The adult macaque spinal cord central canal zone contains proliferative cells and closely resembles the human.

    Science.gov (United States)

    Alfaro-Cervello, Clara; Cebrian-Silla, Arantxa; Soriano-Navarro, Mario; Garcia-Tarraga, Patricia; Matías-Guiu, Jorge; Gomez-Pinedo, Ulises; Molina Aguilar, Pilar; Alvarez-Buylla, Arturo; Luquin, Maria-Rosario; Garcia-Verdugo, Jose Manuel

    2014-06-01

    The persistence of proliferative cells, which could correspond to progenitor populations or potential cells of origin for tumors, has been extensively studied in the adult mammalian forebrain, including human and nonhuman primates. Proliferating cells have been found along the entire ventricular system, including around the central canal, of rodents, but little is known about the primate spinal cord. Here we describe the central canal cellular composition of the Old World primate Macaca fascicularis via scanning and transmission electron microscopy and immunohistochemistry and identify central canal proliferating cells with Ki67 and newly generated cells with bromodeoxyuridine incorporation 3 months after the injection. The central canal is composed of uniciliated, biciliated, and multiciliated ependymal cells, astrocytes, and neurons. Multiciliated ependymal cells show morphological characteristics similar to multiciliated ependymal cells from the lateral ventricles, and uniciliated and biciliated ependymal cells display cilia with large, star-shaped basal bodies, similar to the Ecc cells described for the rodent central canal. Here we show that ependymal cells with one or two cilia, but not multiciliated ependymal cells, proliferate and give rise to new ependymal cells that presumably remain in the macaque central canal. We found that the infant and adult human spinal cord contains ependymal cell types that resemble those present in the macaque. Interestingly, a wide hypocellular layer formed by bundles of intermediate filaments surrounded the central canal both in the monkey and in the human, being more prominent in the stenosed adult human central canal.

  8. Early neurogenesis during caudal spinal cord regeneration in adult Gekko japonicus.

    Science.gov (United States)

    Zhou, Youlang; Xu, Qing; Li, Donghui; Zhao, Lijuan; Wang, Yongjun; Liu, Mei; Gu, Xiaosong; Liu, Yan

    2013-06-01

    Gekko japonicus undergoes dramatic changes in the caudal spinal cord after tail amputation. The amputation induces cell proliferation in the caudal ependymal tube. We performed hematoxylin and eosin staining at different time points in the regeneration process to investigate the morphological characterization of the regenerated appendages. The central canal extended to the blastema post-amputation and the cartilage and muscle tissue appeared 3 weeks after injury. We performed the bromodeoxyuridine (BrdU) incorporation assay to detect proliferating cells during the regeneration process. BrdU positive cells were detected in the peri-central canal. Furthermore, nestin and neuron-specific enolase (NSE) immunocytochemistry were applied to detect neural stem/progenitor cells and neurons. Two weeks after injury, nestin-positive cells undergoing proliferation were located outside of the ependymal tube, and NSE positive cells appeared after 3 weeks of amputation. These data suggest that neurogenesis is an early event during caudal spinal cord regeneration in gecko.

  9. Two distinct subpopulations of nestin-positive cells in adult mouse dentate gyrus.

    Science.gov (United States)

    Fukuda, Satoshi; Kato, Fusao; Tozuka, Yusuke; Yamaguchi, Masahiro; Miyamoto, Yusei; Hisatsune, Tatsuhiro

    2003-10-15

    Neurogenesis in the dentate gyrus of the adult mammalian hippocampus has been proven in a series of studies, but the differentiation process toward newborn neurons is still unclear. In addition to the immunohistochemical study, electrophysiological membrane recordings of precursor cells could provide an alternative view to address this differentiation process. In this study, we performed green fluorescent protein (GFP)-guided selective recordings of nestin-positive progenitor cells in adult dentate gyrus by means of nestin-promoter GFP transgenic mice, because nestin is a typical marker for precursor cells in the adult dentate gyrus. The patch-clamp recordings clearly demonstrated the presence of two distinct subpopulations (type I and type II) of nestin-positive cells. Type I cells had a lower input resistance value of 77.1 M(Omega) (geometric mean), and their radial processes were stained with anti-glial fibrillary acidic protein antibody. On the other hand, type II nestin-positive cells had a higher input resistance value of 2110 MOmega and expressed voltage-dependent sodium current. In most cases, type II cells were stained with anti-polysialylated neural cell adhesion molecule. Taken together with a bromodeoxyuridine pulse-chase analysis, our results may reflect a rapid and dynamic cell conversion of nestin-positive progenitor, from type I to type II, at an early stage of adult neurogenesis in the dentate gyrus.

  10. Identification of the starting point for spermatogenesis resumption in the post-diapause development of the sweet potato hornworm, Agrius convolvuli L.

    Science.gov (United States)

    Kubo-Irie, M; Yamaguchi, T; Tanaka, Y; Yamazaki, I; Irie, M; Mohri, H; Shimoda, M

    2011-06-01

    The resumption of spermatogenesis in post-diapause development was examined in the sweet potato hornworm (Agrius convolvuli) with in vivo bromodeoxyuridine (BrdU) incorporation experiments used to determine the starting point. Diapausing pupae were "overwintered" by chilling at 10 °C for over 4 months, after which they initiated post-diapause development by transferring the pupae to 25 °C with a 12-h light/12-h dark photoperiod. The testes of living, post-diapause pupae were injected with BrdU, which is incorporated into newly synthesized DNA strands. During the first 2 days after diapause termination, the nuclei of spermatogonia and spermatocytes failed to label with BrdU. However, on day 3 of post-diapause pupae (PDP3), labeling studies showed that cell proliferation was initiated by spermatogonia, but not by spermatocytes. In both hemolymph and testes, ecdysteroid concentrations rose gradually, reaching 0.3 μg/ml hemolymph at PDP3. These results led to the following three conclusions. The spermatogonial cell division is highly suppressed during diapause. After a long-term diapause, spermatogenesis resumes in the spermatogonia but not in the spermatocytes of diapause-terminated pupae. Cell division begins in advance of peak ecdysteroid concentrations. The latter result indicates that in post-diapause development, high concentrations of the hormone are not required to initiate spermatogonial proliferation.

  11. Early meiotic-specific protein expression in post-natal rat ovaries.

    Science.gov (United States)

    Zhang, P; Lv, L X; Xing, W J

    2010-12-01

    Recent studies in mice challenged the basic doctrine that most mammalian females lose neo-oogenesis in post-natal ovaries. In order to provide more information in other species, we examined post-natal rat ovaries by histological sections and detected the germline cell marker protein RVLG (rat vasa-like gene), BrdU (5-bromodeoxyuridine) incorporation in RVLG-expressing cells, for identification of germline cells undergoing mitosis and meiosis in the ovarian surface epithelium (OSE). We also detected the expression of early meiotic-specific proteins disruption of meiotic control 1 (DMC1), stimulated by retinoic acid gene 8 (STRA8) and synaptonemal complex protein 3 (SCP3) by immunohistochemical analysis and Western blotting, and the transcript of SCP1, SCP3 and Sporulation-specific protein 11 (SPO11) by RT-PCR in the post-natal ovarian cortex. However we failed in detecting large ovoid cells in the OSE, which may represent the putative germline stem cells (GSCs) that are supposed to sustain neo-oogenesis, and the transcription of the meiotic-specific genes SCP1, SCP3 and SPO11 by RT-PCR as well as the translation of DMC1, STRA8 and SCP3 by Western blotting. Our data support the postulation that there is no neo-oogenesis occurring in the OSE of rat post-natal ovary through meiosis of GSCs.

  12. 短暂脑缺血诱导成年大鼠纹状体内CRMP-4的表达%Induction of CRMP-4 in striatum of adult rat after transient brain ischemia

    Institute of Scientific and Technical Information of China (English)

    刘鹏翀; 杨增进; 邱梅红; 张玲妹; 孙凤艳

    2003-01-01

    AIM: To study the expression of collapsing response mediated protein-4 (CRMP-4) and nestin in the ischemic adult rat brain following transient brain ischemia. METHODS: Brain ischemia was induced by transient left middle cerebral artery occlusion (MCAO) for 60 min in adult rats. The expression of CRMP-4, nestin and bromodeoxyuridine (BrdU) was analyzed by immunohistochemical method. The co-localization of CRMP-4 and nestin or BrdU was analyzed by double staining combined with confocal laser scanning microscopy. RESULTS: CRMP-4, a marker of immature neuron, could be expressed in the ipsilateral striatum and cerebral cortex at 1st and 2nd week after the ischemia-reperfusion; nestin, a marker of neural stem cell, occurred in above regions from several hours to 2 weeks. CRMP-4 costained with nestin and with BrdU incorporation. CONCLUSION: Neural stem cells may present in the striatum and cerebral cortex of adult rat and can be triggered to differentiate into newborn neuron there by ischemic brain trauma.

  13. A PRELIMINARY STUDY OF THE ANTI-CANCER EFFECT OF TANSHINONE ON HEPATIC CANCER AND ITS MECHANISM OF ACTION IN MICE

    Institute of Scientific and Technical Information of China (English)

    Wang Xiujie; Yuan Shulan; Wang Chaojun; Huang Renmin; Li Yuqiong

    1998-01-01

    Objective: There were some experimental researches in vitro, which showed that tanshinonoe (Tan)had cytotoxic activities against some cancer cell lines. But there was no report of anti-cancer activity of Tan in vivo.This experimental study was performed to confirm the anti-cancer activity of Tan in vivo. Methods: Hepatic carcinoma H22 bearing mice were treated with DMSO, 5-Fu, and Tan, at the end of experiment, the mice were sacrificed, tumor tissues were separated and weighed, and the tumor inhibitory rate was calculated, 3 times of the same experiments were performed. The proliferating kinetics of hepatic carcinoma H22 cells in mice was measured by bromodeoxyuridine labeling in vivo and immunohistochemical staining of the proliferating cell nuclear antigen (PCNA) in tumor tissues. Results: The tumor inhibitory rates of Tan were 50.0%, 38.5%, and 40.6% in 3 experiments, respectively, compared with those of the DMSO-treated control groups, the differences were significant statistically (P<0.01). The Brdu labeling and PCNA positive cells were 51.8± 7.9 and 451.1± 26.1, respectively, which were significantly lower than those of controls (84.4± 24.3, 694.8±117.1) (P<0.01). Conclusion:Tan had anti-cancer effect on hepatic carcinoma in vivo;The mechanisms of action might be associated with inhibition of DNA synthesis, PCNA expression and DNA polymerase δ activity of tumor cells.

  14. Tumour destruction and proliferation kinetics following periodic, low power light, haematoporphyrin oligomers mediated photodynamic therapy in the mouse tongue.

    Science.gov (United States)

    Pe, M B; Ikeda, H; Inokuchi, T

    1994-05-01

    Photodynamic therapy (PDT) is an experimental modality in the treatment of cancer. It involves photochemical reactions that require the interaction of a photosensitising drug, light and oxygen. The development of an efficient protocol based on assuring oxygen availability through modulation of the incident light power density and its mode of delivery was addressed in this study. An estimated energy dose of 180 J/cm2 of 630 nm light from pulsed Nd:YAG dye laser was delivered 24 h after injection of 10 mg/kg haematoporphyrin oligomers in C3H/HeNCrj mice bearing the transplantable squamous cell carcinoma NR-S1, by either of these light regimens: (1) 5 mJ/cm2/pulse for 30 min, 1 h dark interval, followed by another 30 min exposure to the same power (low power, periodic light regimen) or (2) 15 mJ/cm2/pulse for 20 min (high power, continuous light regimen). Results showed a higher mean percentage area of tumour destruction with the low power, periodic light regimen at 54.34% in contrast to 12.44% of the high power, continuous light regimen 2 days after PDT. Furthermore, the mean bromodeoxyuridine labelling indices of the remaining viable-appearing cancer cells were 27.90 and 42.41, respectively, indicating a smaller tumour growth fraction with the former regimen. These results suggest that use of low power, periodically delivered light increases the antitumour efficacy of PDT.

  15. Approximately 1 kilobase of sequence 5' to the two myosin light-chain 1/sub f/3/sub f/ gene cap sites is sufficient for differentiation-dependent expression

    Energy Technology Data Exchange (ETDEWEB)

    Billeter, R.; Quitscke, W.; Patterson, B.M.

    1988-03-01

    Approximately 1 kilobase of genomic DNA from the chicken fast myosin light-chain 1/sub f/3/sub f/ gene 5' to the transcriptional start sites for each light-chain mRNA was sufficient for differentiation-dependent, tissue-restricted expression. This was determined in primary chick myoblast cultures transfected with the chloroamphenicol acetyltransferase (CAT) expression vector p8CAT containing these 5'-flanking sequences. The expression of CAT activity from both light-chain promoters was 10- to 20-fold higher in differentiated myotubes than in fibroblasts or myoblasts grown in bromodeoxyuridine. In contrast, the ..beta..-actin and Rous sarcoma virus promoters joined to the CAT gene were expressed equally in all cell backgrounds tested. Even though the relative timing of light-chain 1/sub f/ and 3/sub f/ expression was altered, tissue-restricted, differentiation-dependent expression of the light-chain mRNAs was maintained with these 5' cis-acting sequence elements.

  16. Impaired spatial learning and unaltered neurogenesis in a transgenic model of Alzheimer's disease after oral aluminum exposure.

    Science.gov (United States)

    Ribes, D; Colomina, M T; Vicens, P; Domingo, J L

    2010-08-01

    Although it is well established that aluminum (Al) is neurotoxic, the potential role of this element in the etiology of Alzheimer's disease (AD) is not well established. In this study, we evaluated the effects of oral Al exposure on spatial learning, memory and neurogenesis in Tg2576 mice, an animal model of AD in which Abeta plaques start to be deposited at 9 months of age. Aluminum was given as Al lactate (11 mg/g of food) for 6 months. At 11 months of age a water maze test was carried out to evaluate learning and memory. Subsequently, mice were injected with bromo-deoxyuridine (BrdU) and sacrificed 24 hours or 28 days after the last injection in order to assess proliferation, survival and differentiation of neurons. We observed impaired acquisition in the water maze task in Al-treated Tg2576 mice, as well as worse memory in the Al-exposed groups. In terms of neurogenesis, no effects of aluminum were observed in proliferation, survival and differentiation. The results of this investigation suggest that Tg2576 mice fed for 210 days with rodent chow supplemented with Al lactate at 11 mg/g of food have impaired spatial learning although their neurogenesis remains unmodified.

  17. Effect of bone marrow derived mesenchymal stem cells on lung pathology and inflammation in ovalbumin-induced asthma in mouse

    Directory of Open Access Journals (Sweden)

    Maryam Mohammadian

    2016-01-01

    Full Text Available Objective(s:Bone marrow-derived mesenchymal stem cells (BMSCs have attracted significant interest to treat asthma and its complication. In this study, the effects of BMSCs on lung pathology and inflammation in an ovalbumin-induced asthma model in mouse were examined. Materials and Methods:BALB/c mice were divided into three groups: control group (animals were not sensitized, asthma group (animals were sensitized by ovalbumin, asthma+BMSC group (animals were sensitized by ovalbumin and treated with BMSCs. BMSCs were isolated and characterized and then labeled with Bromodeoxyuridine (BrdU. After that the cells transferred into asthmatic mice. Histopathological changes of the airways, BMSCs migration and total and differential white blood cell (WBC count in bronchoalveolar lavage (BAL fluid were evaluated. Results:A large number of BrdU-BMSCs were found in the lungs of mice treated with BMSCs. The histopathological changes, BAL total WBC counts and the percentage of neutrophils and eosinophils were increased in asthma group compared to the control group. Treatment with BMSCs significantly decreased airway pathological indices, inflammatory cell infiltration, and also goblet cell hyperplasia. Conclusion:The results of this study revealed that BMSCs therapy significantly suppressed the lung pathology and inflammation in the ovalbumin induced asthma model in mouse.

  18. Activin B promotes epithelial wound healing in vivo through RhoA-JNK signaling pathway.

    Directory of Open Access Journals (Sweden)

    Min Zhang

    Full Text Available BACKGROUND: Activin B has been reported to promote the proliferation and migration of keratinocytes in vitro via the RhoA-JNK signaling pathway, whereas its in vivo role and mechanism in wound healing process has not yet been elucidated. PRINCIPAL FINDINGS: In this study, we explored the potential mechanism by which activin B induces epithelial wound healing in mice. Recombinant lentiviral plasmids, with RhoA (N19 and RhoA (L63 were used to infect wounded KM mice. The wound healing process was monitored after different treatments. Activin B-induced cell proliferation on the wounded skin was visualized by electron microscopy and analyzed by 5'-bromodeoxyuridine (BrdU incorporation assay. Protein expression of p-JNK or p-cJun was determined by immunohistochemical staining and immunoblotting analysis. Activin B efficiently stimulated the proliferation of keratinocytes and hair follicle cells at the wound area and promoted wound closure. RhoA positively regulated activin B-induced wound healing by up-regulating the expression of p-JNK and p-cJun. Moreover, suppression of RhoA activation delayed activin B-induced wound healing, while JNK inhibition recapitulated phenotypes of RhoA inhibition on wound healing. CONCLUSION: These results demonstrate that activin B promotes epithelial wound closure in vivo through the RhoA-Rock-JNK-cJun signaling pathway, providing novel insight into the essential role of activin B in the therapy of wound repair.

  19. TRPV6 modulates proliferation of human pancreatic neuroendocrine BON-1 tumour cells.

    Science.gov (United States)

    Skrzypski, Marek; Kołodziejski, Paweł A; Mergler, Stefan; Khajavi, Noushafarin; Nowak, Krzysztof W; Strowski, Mathias Z

    2016-08-01

    Highly Ca(2+) permeable receptor potential channel vanilloid type 6 (TRPV6) modulates a variety of biological functions including calcium-dependent cell growth and apoptosis. So far, the role of TRPV6 in controlling growth of pancreatic neuroendocrine tumour (NET) cells is unknown. In the present study, we characterize the expression of TRPV6 in pancreatic BON-1 and QGP-1 NET cells. Furthermore, we evaluate the impact of TRPV6 on intracellular calcium, the activity of nuclear factor of activated T-cells (NFAT) and proliferation of BON-1 cells. TRPV6 expression was assessed by real-time PCR and Western blot. TRPV6 mRNA expression and protein production were down-regulated by siRNA. Changes in intracellular calcium levels were detected by fluorescence calcium imaging (fura-2/AM). NFAT activity was studied by NFAT reporter assay; cell proliferation by bromodeoxyuridine (BrdU), MTT and propidium iodine staining. TRPV6 mRNA and protein are present in BON-1 and QGP-1 NET-cells. Down-regulation of TRPV6 attenuates BON-1 cell proliferation. TRPV6 down-regulation is associated with decreased Ca(2+) response pattern and reduced NFAT activity. In conclusion, TRPV6 is expressed in pancreatic NETs and modulates cell proliferation via Ca(2+)-dependent mechanism, which is accompanied by NFAT activation.

  20. Regeneration in planarians and other worms: New findings, new tools, and new perspectives.

    Science.gov (United States)

    Saló, Emili; Baguñà, Jaume

    2002-05-01

    Molecular biology, recombinant DNA techniques, and new methods of cell lineage have reignited the interest of planarians and other worms (mainly annelids and nemerteans) as invertebrate model systems of regeneration. Here, the mean results produced in the last five years are reviewed, an update of the genes and molecules involved in planarian regeneration is provided, and a new morphallactic-epimorphic model of pattern formation is suggested. Moreover, and most importantly, we highlight the new strides brought upon by genomic/proteomic analyses, RNA interference (RNAi) to inactivate gene function, and Bromodeoxyuridine (BrdU) cell labelling. The raising hope to obtain transformed neoblasts and transgenic planarians is also stressed. Altogether, such approaches will eventually lead to solve the long-standing open questions on regeneration which still baffles us. Finally, we warn against overlooking the evident links between regeneration processes and those controlling the daily wear and tear of tissues and cells. Both processes act, at least in planarians, upon a unique stem-cell endowed with an unrivaled developmental potential in the animal kingdom-the neoblast. This cell could be considered the forebear and a model system for stem-cell analysis.

  1. Hippocampal abnormalities and enhanced excitability in a murine model of human lissencephaly.

    Science.gov (United States)

    Fleck, M W; Hirotsune, S; Gambello, M J; Phillips-Tansey, E; Suares, G; Mervis, R F; Wynshaw-Boris, A; McBain, C J

    2000-04-01

    Human cortical heterotopia and neuronal migration disorders result in epilepsy; however, the precise mechanisms remain elusive. Here we demonstrate severe neuronal dysplasia and heterotopia throughout the granule cell and pyramidal cell layers of mice containing a heterozygous deletion of Lis1, a mouse model of human 17p13.3-linked lissencephaly. Birth-dating analysis using bromodeoxyuridine revealed that neurons in Lis1+/- murine hippocampus are born at the appropriate time but fail in migration to form a defined cell layer. Heterotopic pyramidal neurons in Lis1+/- mice were stunted and possessed fewer dendritic branches, whereas dentate granule cells were hypertrophic and formed spiny basilar dendrites from which the principal axon emerged. Both somatostatin- and parvalbumin-containing inhibitory neurons were heterotopic and displaced into both stratum radiatum and stratum lacunosum-moleculare. Mechanisms of synaptic transmission were severely disrupted, revealing hyperexcitability at Schaffer collateral-CA1 synapses and depression of mossy fiber-CA3 transmission. In addition, the dynamic range of frequency-dependent facilitation of Lis1+/- mossy fiber transmission was less than that of wild type. Consequently, Lis1+/- hippocampi are prone to interictal electrographic seizure activity in an elevated [K(+)](o) model of epilepsy. In Lis1+/- hippocampus, intense interictal bursting was observed on elevation of extracellular potassium to 6.5 mM, a condition that resulted in only minimal bursting in wild type. These anatomical and physiological hippocampal defects may provide a neuronal basis for seizures associated with lissencephaly.

  2. Co-ultramicronized palmitoylethanolamide/luteolin promotes neuronal regeneration after spinal cord injury

    Directory of Open Access Journals (Sweden)

    Rosalia eCrupi

    2016-03-01

    Full Text Available Spinal cord injury (SCI stimulates activation of astrocytes and infiltration of immune cells at the lesion site; however, the mechanism that promotes the birth of new neurons is still under debate. Neuronal regeneration is restricted after spinal cord injury, but can be stimulated by experimental intervention. Previously we demonstrated that treatment co-ultramicronized palmitoylethanolamide and luteolin, namely co-ultraPEALut, reduced inflammation. The present study was designed to explore the neuroregenerative properties of co-ultra PEALut in an estabished murine model of SCI. A vascular clip was applied to the spinal cord dura at T5 to T8 to provoke injury. Mice were treated with co-ultraPEALut (1 mg/kg, intraperitoneally daily for 72 h after SCI. Co-ultraPEALut increased the numbers of both bromodeoxyuridine-positive nuclei and doublecortin-immunoreactive cells in the spinal cord of injured mice. To correlate neuronal development with synaptic plasticity a Golgi method was employed to analyze dendritic spine density. Co-ultraPEALut administration stimulated expression of the neurotrophic factors brain-derived neurotrophic factor, glial cell-derived neurotrophic factor, nerve growth factor and neurotrophin-3. These findings show a prominent effect of co-ultraPEALut administration in the management of survival and differentiation of new neurons and spine maturation, and may represent a therapeutic treatment for spinal cord and other traumatic diseases.

  3. Radiation-induced cell proliferation in the parotid and submandibular glands of the rat

    Energy Technology Data Exchange (ETDEWEB)

    Peter, B.; Van Waarde, M.A.W.H.; Konings, A.W.T. [Univ. of Groningen (Netherlands); Vissink, A. [Univ. of Groningen (Netherlands)]|[Univ. Hospital, Groningen (Netherlands); `s-Gravenmade, E.J. [Univ. Hospital, Groningen (Netherlands)

    1994-11-01

    Repopulation of tissues with cells at damaged sites is an important feature in the recovery of radiation-induced tissue injury. To obtain insight into the regenerative process in salivary gland tissue, proliferative activity was measured as a function of time in the different epithelial cell compartments of rat parotid and submandibular glands after local X irradiation with a single dose of 15 Gy. Bromodeoxyuridine-labeling indices were determined before and 10 h and 1, 3, 6, 10, 15, 20 and 30 days after irradiation. In both glands, X irradiation caused cell death and cell cycle delay manifested during the first day. Three days after irradiation, cell proliferation started in the intercalated duct. Six days after irradiation, proliferation was also observed in acinar and granular convoluted tubule cells. The striated ducts showed proliferative activity starting at day 6 (parotid) and day 10 (submandibular), respectively. The results of this study suggest that after 15 Gy of X rays repopulation takes place in all cell compartments. From the present study it cannot be deduced if these cells are originating solely from progenitor cells residing in the intercalated duct or if cells of the other compartments are also stimulated. Proliferative activity was found to be higher in the intercalated duct compartment of the parotid gland than of the submandibular gland, which may be related to the suggested greater radiosensitivity and thus a greater demand for cell replenishment in the parotid gland. 41 refs., 4 figs., 1 tab.

  4. Intranasal delivery of plasma and platelet growth factors using PRGF-Endoret system enhances neurogenesis in a mouse model of Alzheimer's disease.

    Directory of Open Access Journals (Sweden)

    Eduardo Anitua

    Full Text Available Neurodegeneration together with a reduction in neurogenesis are cardinal features of Alzheimer's disease (AD induced by a combination of toxic amyloid-β peptide (Aβ and a loss of trophic factor support. Amelioration of these was assessed with diverse neurotrophins in experimental therapeutic approaches. The aim of this study was to investigate whether intranasal delivery of plasma rich in growth factors (PRGF-Endoret, an autologous pool of morphogens and proteins, could enhance hippocampal neurogenesis and reduce neurodegeneration in an amyloid precursor protein/presenilin-1 (APP/PS1 mouse model. Neurotrophic and neuroprotective actions were firstly evident in primary neuronal cultures, where cell proliferation and survival were augmented by Endoret treatment. Translation of these effects in vivo was assessed in wild type and APP/PS1 mice, where neurogenesis was evaluated using 5-bromodeoxyuridine (BdrU, doublecortin (DCX, and NeuN immunostaining 5 weeks after Endoret administration. The number of BrdU, DCX, and NeuN positive cell was increased after chronic treatment. The number of degenerating neurons, detected with fluoro Jade-B staining was reduced in Endoret-treated APP/PS1 mice at 5 week after intranasal administration. In conclusion, Endoret was able to activate neuronal progenitor cells, enhancing hippocampal neurogenesis, and to reduce Aβ-induced neurodegeneration in a mouse model of AD.

  5. Environmental Enrichment Attenuated Sevoflurane-Induced Neurotoxicity through the PPAR-γ Signaling Pathway

    Directory of Open Access Journals (Sweden)

    Yupeng Zhao

    2015-01-01

    Full Text Available Sevoflurane is the most widely used inhaled anesthetic. Environmental enrichment (EE can reverse sevoflurane-induced learning and memory impairment in young mice. However, the mechanism by which EE elicits this effect is unclear. The peroxisome proliferator-activated receptor (PPAR regulatory pathway plays a critical role in the regulation of inflammation in central nervous system diseases. In this study, we investigated whether EE attenuates sevoflurane-induced learning and memory disability via the PPAR signaling pathway. Six-day-old mice were treated with 3% sevoflurane for 2 hours daily from postnatal day 6 (P6 to P8. Then, the mice were treated with EE. The effects of sevoflurane on learning and memory function, PPAR-γ expression in the brain, and the numbers of terminal deoxynucleotidyl transferase dUTP nick end labeling-positive cells and 5-bromodeoxyuridine-positive cells in the hippocampus were determined. Sevoflurane induced neuronal apoptosis and neurogenesis inhibition, which may impair learning and memory in young mice. Furthermore, sevoflurane downregulated PPAR-γ expression. Both EE and the PPAR-γ agonist, rosiglitazone, attenuated sevoflurane-induced neuronal apoptosis, neurogenesis inhibition, and learning and memory impairment. Our findings suggest that EE ameliorated sevoflurane-induced neurotoxicity and learning and memory impairment through the PPAR-γ signaling pathway. PPAR-γ may be a potential therapeutic target for preventing or treating sevoflurane-induced neurotoxicity.

  6. An in situ hybridization and histochemical study of development and postnatal changes of mouse mandibular angular cartilage compared with condylar cartilage.

    Science.gov (United States)

    Shibata, Shunichi; Fujimori, Tatsuya; Yamashita, Yasuo

    2006-03-01

    To investigate the origin and postnatal changes of mouse mandibular angular cartilage, in situ hybridization for cartilaginous marker proteins, histochemistry for alkaline phosphatase (ALP) and tartrate-resistant acid phosphatase (TRAP), and bromodeoxyuridine (BrDU) analyses were performed. Chondrocytes of the mandibular angular cartilage were derived from ALP-positive progenitor cells and first detected at embryonic day (E) 15.5. Newly formed chondrocytes rapidly differentiated into hypertrophic chondrocytes and hypertrophic cell zone rapidly extended in subsequent a few days. During this period, bone sialoprotein mRNA was more widely expressed than osteopontin mRNA in cartilage. Endochondral bone formation started at E 17.5 with the resorption of the bone collar by osteoclasts. These characteristics were consistent with those of the condylar cartilage, although developmental process was 0.5-1.5 day delayed relative to the condylar cartilage. During the postnatal period, contrast to the condylar cartilage, the angular cartilage constantly decreased in volume with advancing age. Reduction of proliferating activity estimated by BrDU incorporation accounts for this phenomenon. We demonstrate new structural features of the mandibular angular cartilage that may contribute to a coming research for the secondary cartilage.

  7. PTHrP regulates chondrocyte maturation in condylar cartilage.

    Science.gov (United States)

    Rabie, A B M; Tang, G H; Xiong, H; Hägg, U

    2003-08-01

    PTHrP is a key factor regulating the pace of endochondral ossification during skeletal development. Mandibular advancement solicits a cascade of molecular responses in condylar cartilage. However, the pace of cellular maturation and its effects on condylar growth are still unknown. The purpose of this study was to evaluate the pattern of expression of PTHrP and correlate it to cellular dynamics of chondrocytes in condylar cartilage during natural growth and mandibular advancement. We fitted 35-day-old Sprague-Dawley rats with functional appliances. Experimental animals with matched controls were labeled with bromodeoxyuridine 3 days before their death, so that mesenchymal cell differentiation could be traced. Mandibular advancement increased the number of differentiated chondroblasts and subsequently increased the cartilage volume. Higher levels of PTHrP expression in experimental animals coincided with the slowing of chondrocyte hypertrophy. Thus, mandibular advancement promoted mesenchymal cell differentiation and triggered PTHrP expression, which retarded their further maturation to allow for more growth.

  8. Nardosinone improves the proliferation, migration and selective differentiation of mouse embryonic neural stem cells.

    Directory of Open Access Journals (Sweden)

    Ze-Hui Li

    Full Text Available In this study, we investigated the impact of Nardosinone, a bioactive component in Nardostachys root, on the proliferation and differentiation of neural stem cells. The neural stem cells were isolated from cerebrums of embryonic day 14 CD1 mice. The proliferation of cells was monitored using the cell counting kit-8 assay, bromodeoxyuridine incorporation and cell cycle analysis. Cell migration and differentiation were investigated with the neurosphere assay and cell specific markers, respectively. The results showed that Nardosinone promotes cells proliferation and increases cells migration distance in a dose-dependent manner. Nardosinone also induces the selective differentiation of neural stem cells to neurons and oligodendrocytes, as indicated by the expression of microtubule-associated protein-2 and myelin basic protein, respectively. Nardosinone also increases the expression of phospho-extracellular signal-regulated kinase and phospho-cAMP response element binding protein during proliferation and differentiation. In conclusion, this study reveals the regulatory effects of Nardosinone on neural stem cells, which may have significant implications for the treatment of brain injury and neurodegenerative diseases.

  9. Enhanced proliferation and dopaminergic differentiation of ventral mesencephalic precursor cells by synergistic effect of FGF2 and reduced oxygen tension

    Energy Technology Data Exchange (ETDEWEB)

    Jensen, Pia [Department of Neurobiology Research, Institute of Molecular Medicine, University of Southern Denmark, Winslowparken 21, DK-5000 Odense C (Denmark); Department of Neurosurgery, University of Bern, CH-3010 Bern (Switzerland); Gramsbergen, Jan-Bert; Zimmer, Jens [Department of Neurobiology Research, Institute of Molecular Medicine, University of Southern Denmark, Winslowparken 21, DK-5000 Odense C (Denmark); Widmer, Hans R. [Department of Neurosurgery, University of Bern, CH-3010 Bern (Switzerland); Meyer, Morten, E-mail: MMeyer@health.sdu.dk [Department of Neurobiology Research, Institute of Molecular Medicine, University of Southern Denmark, Winslowparken 21, DK-5000 Odense C (Denmark)

    2011-07-15

    Effective numerical expansion of dopaminergic precursors might overcome the limited availability of transplantable cells in replacement strategies for Parkinson's disease. Here we investigated the effect of fibroblast growth factor-2 (FGF2) and FGF8 on expansion and dopaminergic differentiation of rat embryonic ventral mesencephalic neuroblasts cultured at high (20%) and low (3%) oxygen tension. More cells incorporated bromodeoxyuridine in cultures expanded at low as compared to high oxygen tension, and after 6 days of differentiation there were significantly more neuronal cells in low than in high oxygen cultures. Low oxygen during FGF2-mediated expansion resulted also in a significant increase in tyrosine hydroxylase-immunoreactive (TH-ir) dopaminergic neurons as compared to high oxygen tension, but no corresponding effect was observed for dopamine release into the culture medium. However, switching FGF2-expanded cultures from low to high oxygen tension during the last two days of differentiation significantly enhanced dopamine release and intracellular dopamine levels as compared to all other treatment groups. In addition, the short-term exposure to high oxygen enhanced in situ assessed TH enzyme activity, which may explain the elevated dopamine levels. Our findings demonstrate that modulation of oxygen tension is a recognizable factor for in vitro expansion and dopaminergic differentiation of rat embryonic midbrain precursor cells.

  10. Somatic genomic variations in extra-embryonic tissues

    Energy Technology Data Exchange (ETDEWEB)

    Weier, Jingly F.; Ferlatte, Christy; Weier, Heinz-Ulli G.

    2010-05-21

    In the mature chorion, one of the membranes that exist during pregnancy between the developing fetus and mother, human placental cells form highly specialized tissues composed of mesenchyme and floating or anchoring villi. Using fluorescence in situ hybridization, we found that human invasive cytotrophoblasts isolated from anchoring villi or the uterine wall had gained individual chromosomes; however, chromosome losses were detected infrequently. With chromosomes gained in what appeared to be a chromosome-specific manner, more than half of the invasive cytotrophoblasts in normal pregnancies were found to be hyperdiploid. Interestingly, the rates of hyperdiploid cells depended not only on gestational age, but were strongly associated with the extraembryonic compartment at the fetal-maternal interface from which they were isolated. Since hyperdiploid cells showed drastically reduced DNA replication as measured by bromodeoxyuridine incorporation, we conclude that aneuploidy is a part of the normal process of placentation potentially limiting the proliferative capabilities of invasive cytotrophoblasts. Thus, under the special circumstances of human reproduction, somatic genomic variations may exert a beneficial, anti-neoplastic effect on the organism.

  11. Evidence that cyclophosphamide can to induce exchanges in the sister chromatids (ICH) through secondary injuries; Evidencia de que la ciclofosfamida puede inducir intercambios en las cromatidas hermanas (ICH) a traves de lesiones secundarias

    Energy Technology Data Exchange (ETDEWEB)

    Morales R, P.; Rodriguez R, R. [Instituto Nacional de Investigaciones nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    By means of the use of destination protocol of ICH inductive injuries (DLI-ICH), it was studied if interchanges in the sister chromatids (ICH) induced by cyclophosphamide (CP), in the second post-treatment division (ICH-2) are produced by secondary injuries or by fresh injuries. For discard between these possibilities it was administered CP at different periods before of the first post-treatment division, taking as reference the administered time for high dose of bromodeoxyuridine (BrdU ) which was approximately at the beginning of this division. The ICH frequencies that occur in the first, the second and the third synthesis stages (S) were determined. It was observed that when the administered CP was four hours before BrdU , the ICH frequencies of the second and the third S were reduced. The frequency of the first ICH increased lightly in relation to those of the normal protocol (0.5 h before BrdU ) and that the supplying of CP six hours before caused almost a total reduction of ICH of second and third S and an important increment of ICH of first S.This was interpreted as evidence that the ICH-2 are product of secondary injuries. (Author)

  12. Growth regulation of primary human keratinocytes by prostaglandin E receptor EP2 and EP3 subtypes.

    Science.gov (United States)

    Konger, R L; Malaviya, R; Pentland, A P

    1998-02-04

    We examined the contribution of specific EP receptors in regulating cell growth. By RT-PCR and northern hybridization, adult human keratinocytes express mRNA for three PGE2 receptor subtypes associated with cAMP signaling (EP2, EP3, and small amounts of EP4). In actively growing, non-confluent primary keratinocyte cultures, the EP2 and EP4 selective agonists, 11-deoxy PGE1 and 1-OH PGE1, caused complete reversal of indomethacin-induced growth inhibition. The EP3/EP2 agonist (misoprostol), and the EP1/EP2 agonist (17-phenyl trinor PGE2), showed less activity. Similar results were obtained with agonist-induced cAMP formation. The ability of exogenous dibutyryl cAMP to completely reverse indomethacin-induced growth inhibition support the conclusion that growth stimulation occurs via an EP2 and/or EP4 receptor-adenylyl cyclase coupled response. In contrast, activation of EP3 receptors by sulprostone, which is virtually devoid of agonist activity at EP2 or EP4 receptors, inhibited bromodeoxyuridine uptake in indomethacin-treated cells up to 30%. Although human EP3 receptor variants have been shown in other cell types to markedly inhibit cAMP formation via a pertussis toxin sensitive mechanisms, EP3 receptor activation and presumably growth inhibition was independent of adenylyl cyclase, suggesting activation of other signaling pathways.

  13. A novel role of RASSF9 in maintaining epidermal homeostasis.

    Directory of Open Access Journals (Sweden)

    Chiou-Mei Lee

    Full Text Available The physiological role of RASSF9, a member of the Ras-association domain family (RASSF, is currently unclear. Here, we report a mouse line in which an Epstein-Barr virus Latent Membrane Protein 1 (LMP1 transgene insertion has created a 7.2-kb chromosomal deletion, which abolished RASSF9 gene expression. The RASSF9-null mice exhibited interesting phenotypes that resembled human ageing, including growth retardation, short lifespan, less subcutaneous adipose layer and alopecia. In the wild-type mice, RASSF9 is predominantly expressed in the epidermal keratinocytes of skin, as determined by quantitative reverse-transcription PCR, immunofluorescence and in situ hybridization. In contrast, RASSF9-/- mice presented a dramatic change in epithelial organization of skin with increased proliferation and aberrant differentiation as detected by bromodeoxyuridine incorporation assays and immunofluorescence analyses. Furthermore, characteristic functions of RASSF9-/- versus wild type (WT mouse primary keratinocytes showed significant proliferation linked to a reduction of p21Cip1 expression under growth or early differentiation conditions. Additionally, in RASSF9-/- keratinocytes there was a drastic down-modulation of terminal differentiation markers, which could be rescued by infection with a recombinant adenovirus, Adv/HA-RASSF9. Our results indicate a novel and significant role of RASSF9 in epidermal homeostasis.

  14. Estradiol and soy extract increase the production of new cells in the dentate gyrus of old rats.

    Science.gov (United States)

    Perez-Martin, Margarita; Salazar, Veronica; Castillo, Carmen; Ariznavarreta, Carmen; Azcoitia, Iñigo; Garcia-Segura, Luis M; Tresguerres, Jesus A F

    2005-05-01

    In young rodents, estradiol increases cell proliferation in the dentate gyrus of the hippocampus. However, it is unknown if the old brain retains this response to estradiol. Here we assessed the generation of new cells in the dentate gyrus of old rats after administration of estradiol or a soy extract, since soy is used as an alternative to hormonal replacement therapy in postmenopausal women. In a first experiment, 12-month-old animals were ovariectomized and studied at 14, 18 or 22 months of age. The production of new cells, assessed by the incorporation of bromodeoxyuridine (BrdU), was similar in 14- and 18-month-old rats. However, there was a significant reduction in the number of BrdU-immunoreactive cells at 22 months of age. In a second experiment, 22-month-old ovariectomized animals were treated for 10 weeks with a weekly s.c. injection of 150 microg estradiol valerianate or with 60 mg/kg per day soy extract added to the drinking water. Both treatments increased significantly the production of new cells in the dentate gyrus. These findings indicate that the brains of old rats retain the ability to increase the production of new cells in response to estradiol and soy extracts.

  15. Adolescent olanzapine sensitization is correlated with hippocampal stem cell proliferation in a maternal immune activation rat model of schizophrenia.

    Science.gov (United States)

    Chou, Shinnyi; Jones, Sean; Li, Ming

    2015-08-27

    Previous work established that repeated olanzapine (OLZ) administration in normal adolescent rats induces a sensitization effect (i.e. increased behavioral responsiveness to drug re-exposure) in the conditioned avoidance response (CAR) model. However, it is unclear whether the same phenomenon can be detected in animal models of schizophrenia. The present study explored the generalizability of OLZ sensitization from healthy animals to a preclinical neuroinflammatory model of schizophrenia in the CAR. Maternal immune activation (MIA) was induced via polyinosinic:polycytidylic acid (PolyI:C) administration into pregnant dams. Behavioral assessments of offspring first identified decreased maternal separation-induced pup ultrasonic vocalizations and increased amphetamine-induced hyperlocomotion in animals prenatally exposed to PolyI:C. In addition, repeated adolescent OLZ administration confirmed the generalizability of the sensitization phenomenon. Using the CAR test, adolescent MIA animals displayed a similar increase in behavioral responsiveness after repeated OLZ exposure during both the repeated drug test days as well as a subsequent challenge test. Neurobiologically, few studies examining the relationship between hippocampal cell proliferation and survival and either antipsychotic exposure or MIA have incorporated concurrent behavioral changes. Thus, the current study also sought to reveal the correlation between OLZ behavioral sensitization in the CAR and hippocampal cell proliferation and survival. 5'-bromodeoxyuridine immunohistochemistry identified a positive correlation between the magnitude of OLZ sensitization (i.e. change in avoidance suppression induced by OLZ across days) and hippocampal cell proliferation. The implications of the relationship between behavioral and neurobiological results are discussed.

  16. Aberrant hippocampal neurogenesis after limbic kindling: Relationship to BDNF and hippocampal-dependent memory.

    Science.gov (United States)

    Botterill, J J; Brymer, K J; Caruncho, H J; Kalynchuk, L E

    2015-06-01

    Seizures dramatically increase the number of adult generated neurons in the hippocampus. However, it is not known whether this effect depends on seizures that originate in specific brain regions or whether it is nonspecific to seizure activity regardless of origin. We used kindling of different brain sites to address this question. Rats received 99 kindling stimulations of the basolateral amygdala, dorsal hippocampus, or caudate nucleus over a 6-week period. After kindling, we counted the number of adult generated hippocampal neurons that were birth-dated with the proliferative marker bromodeoxyuridine (BrdU) to evaluate cell proliferation and survival under conditions of repeated seizures. Next, we counted the number of doublecortin immunoreactive (DCX-ir) cells and evaluated their dendritic complexity to determine if limbic and nonlimbic seizures have differential effects on neuronal maturation. We also quantified hippocampal brain-derived neurotrophin factor (BDNF) protein levels using an ELISA kit and assessed memory performance using a hippocampal-dependent fear conditioning paradigm. We found that limbic, but not nonlimbic, seizures dramatically increased hippocampal cell proliferation and the number of hilar-CA3 ectopic granule cells. Further, limbic kindling promoted dendritic outgrowth of DCX-ir cells and the number of DCX-ir cells containing basal dendrites. Limbic kindling also enhanced BDNF protein levels throughout the entire hippocampus and impaired the retrieval of fear memories. Collectively, our results suggest a relationship between limbic seizures, neurogenesis, BDNF protein, and cognition.

  17. Increased adult hippocampal brain-derived neurotrophic factor and normal levels of neurogenesis in maternal separation rats.

    Science.gov (United States)

    Greisen, Mia H; Altar, C Anthony; Bolwig, Tom G; Whitehead, Richard; Wörtwein, Gitta

    2005-03-15

    Repeated maternal separation of rat pups during the early postnatal period may affect brain-derived neurotrophic factor (BDNF) or neurons in brain areas that are compromised by chronic stress. In the present study, a highly significant increase in hippocampal BDNF protein concentration was found in adult rats that as neonates had been subjected to 180 min of daily separation compared with handled rats separated for 15 min daily. BDNF protein was unchanged in the frontal cortex and hypothalamus/paraventricular nucleus. Expression of BDNF mRNA in the CA1, CA3, or dentate gyrus of the hippocampus or in the paraventricular hypothalamic nucleus was not affected by maternal separation. All animals displayed similar behavioral patterns in a forced-swim paradigm, which did not affect BDNF protein concentration in the hippocampus or hypothalamus. Repeated administration of bromodeoxyuridine revealed equal numbers of surviving, newly generated granule cells in the dentate gyrus of adult rats from the 15 min or 180 min groups. The age-dependent decline in neurogenesis from 3 months to 7 months of age did not differ between the groups. Insofar as BDNF can stimulate neurogenesis and repair, we propose that the elevated hippocampal protein concentration found in maternally deprived rats might be a compensatory reaction to separation during the neonatal period, maintaining adult neurogenesis at levels equal to those of the handled rats.

  18. Disassembly of simian virus 40 during passage through the endoplasmic reticulum and in the cytoplasm.

    Science.gov (United States)

    Kuksin, Dmitry; Norkin, Leonard C

    2012-02-01

    The nonenveloped polyomavirus simian virus 40 (SV40) is taken up into cells by a caveola-mediated endocytic process that delivers the virus to the endoplasmic reticulum (ER). Within the ER lumen, the capsid undergoes partial disassembly, which exposes its internal capsid proteins VP2 and VP3 to immunostaining with antibodies. We demonstrate here that the SV40 genome does not become accessible to detection while the virus is in the ER. Instead, the genome becomes accessible two distinct detection procedures, one using anti-bromodeoxyuridine antibodies and the other using a 5-ethynyl-2-deoxyuridine-based chemical reaction, only after the emergence of partially disassembled SV40 particles in the cytoplasm. These cytoplasmic particles retain some of the SV40 capsid proteins, VP1, VP2, and VP3, in addition to the viral genome. Thus, SV40 particles undergo discrete disassembly steps during entry that are separated temporally and topologically. First, a partial disassembly of the particles occurs in the ER, which exposes internal capsid proteins VP2 and VP3. Then, in the cytoplasm, disassembly progresses further to also make the genomic DNA accessible to immune detection.

  19. Endotoxin contamination of apolipoprotein A-I: effect on macrophage proliferation--a cautionary tale.

    Science.gov (United States)

    Jin, Xueting; Xu, Qing; Champion, Keith; Kruth, Howard S

    2015-05-01

    This technical report addresses the problem of endotoxin contamination of apolipoprotein reagents. Using a bromodeoxyuridine incorporation cell proliferation assay, we observed that human plasma ApoA-I as low as 1 μg/ml resulted in a >90% inhibition in macrophage proliferation. However, not all ApoA-I from different sources showed this effect. We considered the possibility that endotoxin contamination of the apolipoproteins contributed to the differential inhibition of macrophage cell proliferation. Endotoxin alone very potently inhibited macrophage proliferation (0.1 ng/ml inhibited macrophage proliferation>90%). Measurement of endotoxin levels in the apolipoprotein products, including an analysis of free versus total endotoxin, the latter which included endotoxin that was masked due to binding to protein, suggested that free endotoxin mediated inhibition of macrophage proliferation. Despite the use of an advanced endotoxin removal procedure and agents commonly used to inhibit endotoxin action, the potency of endotoxin precluded successful elimination of endotoxin effect. Our findings show that endotoxin contamination can significantly influence apparent apolipoprotein-mediated cell effects (or effects of any other biological products), especially when these products are tested on highly endotoxin-sensitive cells, such as macrophages.

  20. 信息动态%Evaluation of Mitochondrial Damage of lsletβCells by Mitochondrial Permeability Transition Pore

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Objective To evaluate the mitochondrial damage of islet β cells under glucolipotoxicity by investigating the mitochondrial permeability transition pore (mPTP). Methods Pancreatic β cell lines INS-1 cells were treated with 0. 4 mmol/L palmitic acid and different concentrations of glucose (5.6 mmol/L or 25 mmol/L). The mitochondrial membrane potential, mPTP and reactive oxygen species (ROS) were measured by flow cytometry and fluorescence staining technique to assess the mitochon drial damage. Cell proliferation was measured by 5-bromodeoxyuridine incorporation and cell apoptosis was detected by Annexin V method. Results Compared with the low glucose concentration, the high glucose concentration resulted in decreased mPTP activity (P<0.05), increased mitochondrial membrane potential (P<0.05) and increased cell proliferation rate (P<0.05). There was no significant change in ROS generation. When cells were exposed to high glucose concentration and palmitic acid, both mPTP activity and mitochonhdrial membrane potential reduced (P<0.05), with increased cell apoptosis rate (P <0.05) and increased ROS generation. Conclusion The high glucose concentration decreases mPTP and increases mitochondrial membrane potential, suggesting that cells may remain in an unstable high metabolic state. Evaluation of mPTP may contribute to a more comprehensive understanding of mitochondrial dysfunction under glucotoxictiy.

  1. Lactobacillus decelerates cervical epithelial cell cycle progression.

    Directory of Open Access Journals (Sweden)

    Katarina Vielfort

    Full Text Available We investigated cell cycle progression in epithelial cervical ME-180 cells during colonization of three different Lactobacillus species utilizing live cell microscopy, bromodeoxyuridine incorporation assays, and flow cytometry. The colonization of these ME-180 cells by L. rhamnosus and L. reuteri, originating from human gastric epithelia and saliva, respectively, was shown to reduce cell cycle progression and to cause host cells to accumulate in the G1 phase of the cell cycle. The G1 phase accumulation in L. rhamnosus-colonized cells was accompanied by the up-regulation and nuclear accumulation of p21. By contrast, the vaginal isolate L. crispatus did not affect cell cycle progression. Furthermore, both the supernatants from the lactic acid-producing L. rhamnosus colonies and lactic acid added to cell culture media were able to reduce the proliferation of ME-180 cells. In this study, we reveal the diversity of the Lactobacillus species to affect host cell cycle progression and demonstrate that L. rhamnosus and L. reuteri exert anti-proliferative effects on human cervical carcinoma cells.

  2. Therapeutic Potential of Umbilical Cord Blood Stem Cells on Brain Damage of a Model of Stroke

    Directory of Open Access Journals (Sweden)

    Mohammad Reza Nikravesh

    2011-11-01

    Full Text Available Introduction: Human cord blood-derived stem cells are a rich source of stem cells as well as precursors. With regard to the researchers have focused on the therapeutic potential of stem cell in the neurological disease such as stroke, the aim of this study was the investiga-tion of the therapeutic effects of human cord blood-derived stem cells in cerebral ischemia on rat. Methods: This study was carried out on young rats. Firstly, to create a laboratory model of ischemic stroke, carotid artery of animals was occluded for 30 minutes. Then, umbilical cord blood cells were isolated and labeled using bromodeoxyuridine and 2×105 cells were injected into the experimental group via the tail vein. Rats with hypoxic condi-tions were used as a sham group. A group of animals did not receive any injection or sur-geries were used as a control. Results: Obtained results were evaluated based on behavior-al responses and immunohistochemistry, with emphasis on areas of putamen and caudate nucleus in the control, sham and experimental groups. Our results indicated that behavioral recovery was observed in the experimental group compared to the either the sham or the control group. However, histological studies demonstrated a low percent of tissue injury in the experimental group in comparison with the sham group. Conclusion: Stem cell trans-plantation is beneficial for the brain tissue reparation after hypoxic ischemic cell death.

  3. Ghrelin directly stimulates adult hippocampal neurogenesis: implications for learning and memory.

    Science.gov (United States)

    Li, Endan; Chung, Hyunju; Kim, Yumi; Kim, Dong Hyun; Ryu, Jong Hoon; Sato, Takahiro; Kojima, Masayasu; Park, Seungjoon

    2013-01-01

    Adult hippocampal neurogenesis is important in mediating hippocampal-dependent learning and memory. Exogenous ghrelin is known to stimulate progenitor cell proliferation in the dentate gyrus of adult hippocampus. The aim of this study was to investigate the role of endogenous ghrelin in regulating the in vivo proliferation and differentiation of the newly generating cells in the adult hippocampus using ghrelin knockout (GKO) mice. Targeted deletion of ghrelin gene resulted in reduced numbers of progenitor cells in the subgranular zone (SGZ) of the hippocampus, while ghrelin treatment restored progenitor cell numbers to those of wild-type controls. We also found that not only the number of bromodeoxyuridine (BrdU)-positive cells but also the fraction of immature neurons and newly generated neurons were decreased in the GKO mice, which were increased by ghrelin replacement. Additionally, in the GKO mice, we observed impairment of memory performance in Y-maze task and novel object recognition test. However, these functional deficiencies were attenuated by ghrelin administration. These results suggest that ghrelin directly induces proliferation and differentiation of adult neural progenitor cells in the SGZ. Our data suggest ghrelin may be a plausible therapeutic potential to enhance learning and memory processes.

  4. Culture, characterization and differentiation of neural precursors from the central nervous system of guinea pigs (Cavia porcellus Linnaeus, 1758

    Directory of Open Access Journals (Sweden)

    Erika Toledo da Fonseca

    Full Text Available Abstract: Potentially neurogenic areas were initially identified by incorporation of bromodeoxyuridine (BrdU in cells underlying the subventricular zone (SVZ of the lateral ventricles wall, hippocampus and olfactory bulbs of newborn guinea pigs. Neural precursors from the SVZ were cultured in suspension, generating neurospheres (NSFs, which, upon dissociation were able to generate new NSFs. Upon culture in the absence of growth factors, cells dissociated from NSFs displayed evidence for neural differentiation, giving rise to cells from neural lineage. Flow cytometry analysis for of NSFs-derived cells after differentiation revealed approximately 13.3% nestin positive, 5.5% Beta-III-tubulin positive, 9% GFAP positive and 7.8% mGalC positive. Functional assays by measurement of calcium influx upon gamma butiric amino acid (GABA and glutamate stimuli, revealed stimulation in differentiated cells, an indicator of neuronal differentiation. The ability of guinea pig SVZ cells to originate functional neurons in vitro is promising for research and towards a future use of neural stem cells in the therapy of neurological disorders.

  5. Effects of enriched physical and social environments on motor performance, associative learning, and hippocampal neurogenesis in mice.

    Directory of Open Access Journals (Sweden)

    Noelia Madroñal

    Full Text Available We have studied the motor abilities and associative learning capabilities of adult mice placed in different enriched environments. Three-month-old animals were maintained for a month alone (AL, alone in a physically enriched environment (PHY, and, finally, in groups in the absence (SO or presence (SOPHY of an enriched environment. The animals' capabilities were subsequently checked in the rotarod test, and for classical and instrumental learning. The PHY and SOPHY groups presented better performances in the rotarod test and in the acquisition of the instrumental learning task. In contrast, no significant differences between groups were observed for classical eyeblink conditioning. The four groups presented similar increases in the strength of field EPSPs (fEPSPs evoked at the hippocampal CA3-CA1 synapse across classical conditioning sessions, with no significant differences between groups. These trained animals were pulse-injected with bromodeoxyuridine (BrdU to determine hippocampal neurogenesis. No significant differences were found in the number of NeuN/BrdU double-labeled neurons. We repeated the same BrdU study in one-month-old mice raised for an additional month in the above-mentioned four different environments. These animals were not submitted to rotarod or conditioned tests. Non-trained PHY and SOPHY groups presented more neurogenesis than the other two groups. Thus, neurogenesis seems to be related to physical enrichment at early ages, but not to learning acquisition in adult mice.

  6. Effect of voluntary running on adult hippocampal neurogenesis in cholinergic lesioned mice

    Directory of Open Access Journals (Sweden)

    Dawe Gavin S

    2009-06-01

    Full Text Available Abstract Background Cholinergic neuronal dysfunction of the basal forebrain is observed in patients with Alzheimer's disease and dementia, and has been linked to decreased neurogenesis in the hippocampus, a region involved in learning and memory. Running is a robust inducer of adult hippocampal neurogenesis. This study aims to address the effect of running on hippocampal neurogenesis in lesioned mice, where septohippocampal cholinergic neurones have been selectively eliminated in the medial septum and diagonal band of Broca of the basal forebrain by infusion of mu-p75-saporin immunotoxin. Results Running increased the number of newborn cells in the dentate gyrus of the hippocampus in cholinergic denervated mice compared to non-lesioned mice 24 hours after injection of bromodeoxyuridine (BrdU. Although similar levels of surviving cells were present in cholinergic depleted animals and their respective controls four weeks after injection of BrdU, the majority of progenitors that proliferate in response to the initial period of running were not able to survive beyond one month without cholinergic input. Despite this, the running-induced increase in the number of surviving neurones was not affected by cholinergic depletion. Conclusion The lesion paradigm used here models aspects of the cholinergic deficits associated with Alzheimer's Disease and aging. We showed that running still increased the number of newborn cells in the adult hippocampal dentate gyrus in this model of neurodegenerative disease.

  7. Effects of Scutellaria baicalensis on neurogenesis in the hippocampal dentate gyrus and on spatial memory of adult rats

    Institute of Scientific and Technical Information of China (English)

    Sun-Hwa Lee; Byung-II Min; Byung-soo Ahn; Bong-soo Lim; Seong-Kyu Kim; Sam-Ki Kim; Dae-II Lee; Sung-Rae Cho; Deok-Gon Kim; Jae-Bok Han

    2011-01-01

    We investigated the effects of ethanol extracted Scutellaria baicalensis (EESB) on spatial memory function and neurogenesis in the hippocampal dentate gyrus. Adult Sprague-Dawley rats were orally administered 50, 100, or 200 mg/kg of EESB for 6 successive days. The radial-arm maze test showed that 200 mg/kg of EESB improved the spatial memory of adult rats. Confocal microscopy results showed that 100 mg/kg of EESB increased the number of bromodeoxyuridine (BrdU)- and neuron-specific nuclear protein-positive cells in the granular cell layer, and that 100 and 200 mg/kg of EESB increased the number of BrdU-/neuron-specific nuclear protein-positive cells in the sub-granular zone. 200 mg/kg of EESB increased the number of BrdU-/glial fibrillary acid protein-positive cells in the subgranular zone. These findings indicate that EESB can effectively promote neurogenesis in the hippocampal dentate gyrus and improve spatial memory function.

  8. THE EFFECT OF LIGUSTRAZINE ON NEUROGENESIS IN CORTEX AFTER FOCAL CEREBRAL ISCHEMIA IN RATS

    Institute of Scientific and Technical Information of China (English)

    Qiu Fen; Liu Yong; Zhang Pengbo; Kang Qianyan; Tian Yingfang; Chen Xinlin; Zhao Jianjun; Qi Cunfang

    2006-01-01

    Objective To explore the effect of Ligustrazine on neurogenesis in cortex after focal cerebral ischemia in rats. Methods Focal cerebral ischemia was induced by left middle cerebral arteryocclusion with asuture. Two hours later, injection of Ligustrazine (80 mg/kg, 1 time/d) was performed peritoneally. Four hours after the ischemia,5-bromodeoxyuridine (BrdU) (50 mg/kg, 1 time/d) was injected peritoneally. At 7 d, 14 d and 21 d after ischemia,BrdU positive cells in the cortex were observed by immunohistochemical staining. Results In ischemic model group, at 7 day, sparsely-distributed BrdU positive cells were observed in the Ⅱ - Ⅵ layers of the ipsilateral cortex, with a band-like distribution in ischemic penumbra. With the prolongation of ischemia, the number of BrdU positive cells increased.In Ligustrazine group, BrdU positive cells were also observed in the Ⅱ - Ⅵ layers of the cortex, with an intense distribution in ischemic penumbra. The numbers of BrdU positive cells at 7 d, 14 d and 21 d were more than those in ischemic model group respectively. Conclusion Ligustrazine increases the proliferated cells in cortex after focal cerebral ischemia in rats. The results suggest that it may be useful for promoting self-repair after ischemia.

  9. Selective estrogen receptor modulators (SERMs) enhance neurogenesis and spine density following focal cerebral ischemia.

    Science.gov (United States)

    Khan, Mohammad M; Wakade, Chandramohan; de Sevilla, Liesl; Brann, Darrell W

    2015-02-01

    Selective estrogen receptor modulators (SERMs) have been reported to enhance synaptic plasticity and improve cognitive performance in adult rats. SERMs have also been shown to induce neuroprotection against cerebral ischemia and other CNS insults. In this study, we sought to determine whether acute regulation of neurogenesis and spine remodeling could be a novel mechanism associated with neuroprotection induced by SERMs following cerebral ischemia. Toward this end, ovariectomized adult female rats were either implanted with pellets of 17β-estradiol (estrogen) or tamoxifen, or injected with raloxifene. After one week, cerebral ischemia was induced by the transient middle-cerebral artery occlusion (MCAO) method. Bromodeoxyuridine (BrdU) was injected to label dividing cells in brain. We analyzed neurogenesis and spine density at day-1 and day-5 post MCAO. In agreement with earlier findings, we observed a robust induction of neurogenesis in the ipsilateral subventricular zone (SVZ) of both the intact as well as ovariectomized female rats following MCAO. Interestingly, neurogenesis in the ipsilateral SVZ following ischemia was significantly higher in estrogen and raloxifene-treated animals compared to placebo-treated rats. In contrast, this enhancing effect on neurogenesis was not observed in tamoxifen-treated rats. Finally, both SERMs, as well as estrogen significantly reversed the spine density loss observed in the ischemic cortex at day-5 post ischemia. Taken, together these results reveal a profound structural remodeling potential of SERMs in the brain following cerebral ischemia. This article is part of a Special Issue entitled "Sex steroids and brain disorders".

  10. Low-dose sevoflurane promotes hippocampal neurogenesis and facilitates the development of dentate gyrus-dependent learning in neonatal rats.

    Science.gov (United States)

    Chen, Chong; Shen, Feng-Yan; Zhao, Xuan; Zhou, Tao; Xu, Dao-Jie; Wang, Zhi-Ru; Wang, Ying-Wei

    2015-01-01

    Huge body of evidences demonstrated that volatile anesthetics affect the hippocampal neurogenesis and neurocognitive functions, and most of them showed impairment at anesthetic dose. Here, we investigated the effect of low dose (1.8%) sevoflurane on hippocampal neurogenesis and dentate gyrus-dependent learning. Neonatal rats at postnatal day 4 to 6 (P4-6) were treated with 1.8% sevoflurane for 6 hours. Neurogenesis was quantified by bromodeoxyuridine labeling and electrophysiology recording. Four and seven weeks after treatment, the Morris water maze and contextual-fear discrimination learning tests were performed to determine the influence on spatial learning and pattern separation. A 6-hour treatment with 1.8% sevoflurane promoted hippocampal neurogenesis and increased the survival of newborn cells and the proportion of immature granular cells in the dentate gyrus of neonatal rats. Sevoflurane-treated rats performed better during the training days of the Morris water maze test and in contextual-fear discrimination learning test. These results suggest that a subanesthetic dose of sevoflurane promotes hippocampal neurogenesis in neonatal rats and facilitates their performance in dentate gyrus-dependent learning tasks.

  11. Cerebellar stem cells do not produce neurons and astrocytes in adult mouse

    Energy Technology Data Exchange (ETDEWEB)

    Su, Xin; Guan, Wuqiang; Yu, Yong-Chun; Fu, Yinghui, E-mail: fuyh@fudan.edu.cn

    2014-07-18

    Highlights: • No new neurons and astrocytes are generated in adult mouse cerebellum. • Very few mash1{sup +} or nestin{sup +} stem cells exist, and most of them are quiescent. • Cell proliferation rate is diversified among cerebellar regions and decreases over time. - Abstract: Although previous studies implied that cerebellar stem cells exist in some adult mammals, little is known about whether these stem cells can produce new neurons and astrocytes. In this study by bromodeoxyuridine (BrdU) intraperitoneal (i.p.) injection, we found that there are abundant BrdU{sup +} cells in adult mouse cerebellum, and their quantity and density decreases significantly over time. We also found cell proliferation rate is diversified in different cerebellar regions. Among these BrdU{sup +} cells, very few are mash1{sup +} or nestin{sup +} stem cells, and the vast majority of cerebellar stem cells are quiescent. Data obtained by in vivo retrovirus injection indicate that stem cells do not produce neurons and astrocytes in adult mouse cerebellum. Instead, some cells labeled by retrovirus are Iba1{sup +} microglia. These results indicate that very few stem cells exist in adult mouse cerebellum, and none of these stem cells contribute to neurogenesis and astrogenesis under physiological condition.

  12. Does developmental hypothyroidism produce lasting effects ...

    Science.gov (United States)

    The subgranular zone of the dentate gyrus (DO) of the adult hippocampus generates new neurons throughout life. Thyroid hormones (TH) are essential for brain development, but impaired neurogenesis with adult hypothyroidism has also been reported. We investigated the role of milder degrees of TH disruption on adult neurogenesis following hypothyroidism induced during development, in adulthood, or both. Pregnant dams were administered the TH synthesis inhibitor, propylthiouracil (PTU, 0 or 3ppm in drinking water) from gestational day 6 and pups were weaned to control water on postnatal day (PN)2 I. On PN6O, offspring from control or PTU dams were either re-exposed to PTU (3ppm) for I month or maintained on control. Bromodeoxyuridine (BrdU 50 mg/kg, ip, twice daily) was administered to all animals on the last 5 days of the re-exposure period, and animals sacrificed 28 d later. Animals were perfused intracardially, the brains were removed, embedded in a MultiBrain (NSA) array and freeze sectioned. Every 8th section throughout the hippocampus was stained with an antibody against BrdU to mark actively dividing cells. The volume of the DO and the number of BrdUpositive cells were assessed from images captured on a Nikon microscope (200X) and Nikon Elements software. Preliminary findings indicate that developmental exposure to PTU produced a persistent reduction in the volume of the adult DO. BrdU cell counts were reduced similarly in all P11J-exposed groups. These data

  13. 1-Aryl-3-[4-(thieno[3,2-d]pyrimidin-4-yloxyphenyl]ureas as VEGFR-2 Tyrosine Kinase Inhibitors: Synthesis, Biological Evaluation, and Molecular Modelling Studies

    Directory of Open Access Journals (Sweden)

    Pedro Soares

    2013-01-01

    Full Text Available The vascular endothelial growth factor receptor-2 (VEGFR-2 is a tyrosine kinase receptor involved in the growth and differentiation of endothelial cells that are implicated in tumor-associated angiogenesis. In this study, novel 1-aryl-3-[4-(thieno[3,2-d]pyrimidin-4-yloxyphenyl]ureas were synthesized and evaluated for the VEGFR-2 tyrosine kinase inhibition. Three of these compounds showed good VEGFR-2 inhibition presenting low IC50 values (150–199 nM in enzymatic assays, showing also a significant proliferation inhibition of VEGF-stimulated human umbilical vein endothelial cells (HUVECs at low concentrations (0.5–1 µM, using the Bromodeoxyuridine (BrdU assay, not affecting cell viability. The determination of the total and phosphorylated (active VEGFR-2 was performed by western blot, and it was possible to conclude that the compounds significantly inhibit the phosphorylation of the receptor at 1 µM pointing to their antiproliferative mechanism of action in HUVECs. The molecular rationale for inhibiting the tyrosine kinase domain of VEGFR-2 was also performed and discussed using molecular docking studies.

  14. Origin of Androgen-Insensitive Poorly Differentiated Tumors in the Transgenic Adenocarcinoma of Mouse Prostate Model

    Directory of Open Access Journals (Sweden)

    Wendy J. Huss

    2007-11-01

    Full Text Available Following castration, the transgenic adenocarcinoma of mouse prostate (TRAMP model demonstrates rapid development of SV40-Tag-driven poorly differentiated tumors that express neuroendocrine cell markers. The cell population dynamics within the prostates of castrated TRAMP mice were characterized by analyzing the incorporation of 5-bromodeoxyuridine (BrdUrd and the expression of SV40-Tag, synaptophysin, and androgen receptor (AR. Fourteen days postcastration, the remaining epithelial cells and adenocarcinoma cells were nonproliferative and lacked detectable SV40-Tag or synaptophysin expression. In contrast, morphologically distinct intraglandular foci were identified which expressed SV40-Tag, synaptophysin, and Ki67, but that lacked AR expression. These proliferative SV40-Tag and synaptophysin-expressing intraglandular foci were associated with the rare BrdUrd-retaining cells. These foci expanded rapidly in the postcastration prostate environment, in contrast to the AR- and SV40-Tag-expressing adenocarcinoma cells that lost SV40-Tag expression and underwent apoptosis after castration. Intraglandular foci of synaptophysin-expressing cells were also observed in the prostates of intact TRAMP mice at a comparable frequency; however, they did not progress to rapidly expanding tumors until much later in the life of the mice. This suggests that the foci of neuroendocrine-like cells that express SV40-Tag and synaptophysin, but lack AR, arise independent of androgen-deprivation and represent the source of the poorly differentiated tumors that are the lethal phenotype in the TRAMP model.

  15. Carbon Nanohorns Promote Maturation of Neonatal Rat Ventricular Myocytes and Inhibit Proliferation of Cardiac Fibroblasts: a Promising Scaffold for Cardiac Tissue Engineering

    Science.gov (United States)

    Wu, Yujing; Shi, Xiaoli; Li, Yi; Tian, Lei; Bai, Rui; Wei, Yujie; Han, Dong; Liu, Huiliang; Xu, Jianxun

    2016-06-01

    Cardiac tissue engineering (CTE) has developed rapidly, but a great challenge remains in finding practical scaffold materials for the construction of engineered cardiac tissues. Carbon nanohorns (CNHs) may be a potential candidate due to their special structure and properties. The purpose of this study was to assess the effect of CNHs on the biological behavior of neonatal rat ventricular myocytes (NRVMs) for CTE applications. CNHs were incorporated into collagen to form growth substrates for NRVMs. Transmission electron microscopy (TEM) observations demonstrated that CNHs exhibited a good affinity to collagen. Moreover, it was found that CNH-embedded substrates enhanced adhesion and proliferation of NRVMs. Immunohistochemical staining, western blot analysis, and intracellular calcium transient measurements indicated that the addition of CNHs significantly increased the expression and maturation of electrical and mechanical proteins (connexin-43 and N-cadherin). Bromodeoxyuridine staining and a Cell Counting Kit-8 assay showed that CNHs have the ability to inhibit the proliferation of cardiac fibroblasts. These findings suggest that CNHs can have a valuable effect on the construction of engineered cardiac tissues and may be a promising scaffold for CTE.

  16. GDNF-induced leukemia inhibitory factor can mediate differentiation via the MEK/ERK pathway in pheochromocytoma cells derived from nf1-heterozygous knockout mice.

    Science.gov (United States)

    Park, Jong-In; Powers, James F; Tischler, Arthur S; Strock, Christopher J; Ball, Douglas W; Nelkin, Barry D

    2005-02-01

    Glial cell line-derived neurotrophic factor (GDNF) can induce neuron-like differentiation of mouse pheochromocytoma (MPC) cell lines derived from mice with a heterozygous knockout mutation of nf1, the murine counterpart of the human gene mutated in neurofibromatosis type 1 (NF1). Here, we show that GDNF-induced differentiation in the MPC 862L cell line is mediated by the MEK/extracellular signal-regulated kinase (ERK) pathway. Neurite outgrowth, increased expression of growth-associated protein 43, and decreased incorporation of bromodeoxyuridine (BrdU) were induced by treatment with GDNF, H-RasV12, or a constitutively active MEK2. GDNF also induces leukemia inhibitory factor (LIF) via the MEK/ERK pathway, and LIF itself can elicit these differentiative changes via a cell-extrinsic autocrine/paracrine pathway. Treatment with anti-LIF neutralizing antibody depleted the differentiative activity of the conditioned medium from cells stimulated for MEK/ERK signaling, while recombinant LIF could induce differentiation in MPC cells, indicating that LIF is the sole factor with differentiative activity. LIF could activate MEK1/2 and STAT3, but LIF-induced differentiation was blocked only by the MEK1/2-specific inhibitor U0126, indicating that the MEK/ERK pathway is necessary for LIF action in MPC cells. Our findings suggest that LIF may be utilized for signaling mediated by GDNF and may be important in the pathobiology of neuroendocrine tumors.

  17. Spermatogenic cycle length and sperm production in the freshwater turtle Kinosternon scorpioides.

    Science.gov (United States)

    Sousa, Alana Lislea; Campos-Junior, Paulo Henrique Almeida; Costa, Guilherme Mattos Jardim; de França, Luiz Renato

    2014-02-01

    Kinosternon scorpioides is a Brazilian freshwater turtle that belongs to the class Reptilia, encompassing almost 10,000 species. Nevertheless, very little is known about the testicular quantitative parameters, particularly those related to spermatogenesis, in this vertebrate class. Our main objectives were to investigate in detail the structure and function of the testis in K. scorpioides, particularly the aspects related to spermatogenic cycle length and Sertoli cell (SC) and spermatogenic efficiencies. Nine sexually mature turtles were examined, and intraperitoneal bromodeoxyuridine injections were administered to estimate duration of spermatogenesis. Based on the acrosome development in spermatids and the overall germ cell associations, 10 stages of the seminiferous epithelium cycle were characterized. Similar to birds, humans, and some primate species, several stages were observed per seminiferous tubule cross-sections. One spermatogenic cycle and the entire spermatogenic process lasted, respectively, 12 and 53 days. The SC efficiency (number of round spermatids per SC) and daily sperm production per gram of testis were, respectively, 20 and 40 million spermatids. As established for mammals, our findings suggest that SC efficiency is also a critical determinant of sperm production in reptiles. To our knowledge, this is the first study to investigate the kinetics of spermatogenesis and testis function in any reptilian species. Besides allowing a better understanding of reproductive biology in reptiles, these data will be useful in comparative studies. Moreover, these results could provide the basis for investigations related to the evaluation of spermatogonial stem cell physiology niche in Kinosternon scorpioides.

  18. CART peptide induces neuroregeneration in stroke rats.

    Science.gov (United States)

    Luo, Yu; Shen, Hui; Liu, Hua-Shan; Yu, Seong-Jin; Reiner, David J; Harvey, Brandon K; Hoffer, Barry J; Yang, Yihong; Wang, Yun

    2013-02-01

    Utilizing a classic stroke model in rodents, middle cerebral artery occlusion (MCAo), we describe a novel neuroregenerative approach using the repeated intranasal administration of cocaine- and amphetamine-regulated transcript (CART) peptide starting from day 3 poststroke for enhancing the functional recovery of injured brain. Adult rats were separated into two groups with similar infarction sizes, measured by magnetic resonance imaging on day 2 after MCAo, and were treated with CART or vehicle. The CART treatment increased CART level in the brain, improved behavioral recovery, and reduced neurological scores. In the subventricular zone (SVZ), CART enhanced immunolabeling of bromodeoxyuridine, a neural progenitor cell marker Musashi-1, and the proliferating cell nuclear antigen, as well as upregulated brain-derived neurotrophic factor (BDNF) mRNA. AAV-GFP was locally applied to the SVZ to examine migration of SVZ cells. The CART enhanced migration of GFP(+) cells from SVZ toward the ischemic cortex. In SVZ culture, CART increased the size of neurospheres. The CART-mediated cell migration from SVZ explants was reduced by anti-BDNF blocking antibody. Using (1)H-MRS (proton magnetic resonance spectroscopy), increases in N-acetylaspartate levels were found in the lesioned cortex after CART treatment in stroke brain. Cocaine- and amphetamine-regulated transcript increased the expression of GAP43 and fluoro-ruby fluorescence in the lesioned cortex. In conclusion, our data suggest that intranasal CART treatment facilitates neuroregeneration in stroke brain.

  19. Adult zebrafish intestine resection: a novel model of short bowel syndrome, adaptation, and intestinal stem cell regeneration.

    Science.gov (United States)

    Schall, K A; Holoyda, K A; Grant, C N; Levin, D E; Torres, E R; Maxwell, A; Pollack, H A; Moats, R A; Frey, M R; Darehzereshki, A; Al Alam, D; Lien, C; Grikscheit, T C

    2015-08-01

    Loss of significant intestinal length from congenital anomaly or disease may lead to short bowel syndrome (SBS); intestinal failure may be partially offset by a gain in epithelial surface area, termed adaptation. Current in vivo models of SBS are costly and technically challenging. Operative times and survival rates have slowed extension to transgenic models. We created a new reproducible in vivo model of SBS in zebrafish, a tractable vertebrate model, to facilitate investigation of the mechanisms of intestinal adaptation. Proximal intestinal diversion at segment 1 (S1, equivalent to jejunum) was performed in adult male zebrafish. SBS fish emptied distal intestinal contents via stoma as in the human disease. After 2 wk, S1 was dilated compared with controls and villus ridges had increased complexity, contributing to greater villus epithelial perimeter. The number of intervillus pockets, the intestinal stem cell zone of the zebrafish increased and contained a higher number of bromodeoxyuridine (BrdU)-labeled cells after 2 wk of SBS. Egf receptor and a subset of its ligands, also drivers of adaptation, were upregulated in SBS fish. Igf has been reported as a driver of intestinal adaptation in other animal models, and SBS fish exposed to a pharmacological inhibitor of the Igf receptor failed to demonstrate signs of intestinal adaptation, such as increased inner epithelial perimeter and BrdU incorporation. We describe a technically feasible model of human SBS in the zebrafish, a faster and less expensive tool to investigate intestinal stem cell plasticity as well as the mechanisms that drive intestinal adaptation.

  20. Optimization of a flow cytometric method for the simultaneous measurement of cell surface antigen, DNA content, and in vitro BrdUrd incorporation into normal and malignant hematopoietic cells.

    Science.gov (United States)

    Holm, M; Thomsen, M; Høyer, M; Hokland, P

    1998-05-01

    We have designed an assay for the simultaneous measurement of cell surface phenotype, S-phase fraction, and DNA content by single laser instrumentation for the purpose of determining the labeling index (LI), duration of S-phase (Ts), and the potential doubling time (Tpot) of leukocyte subpopulations. The procedure was optimized with regard to: mode of bromodeoxyuridine (BrdUrd) incorporation, selection of suitable leukocyte differentiation antigens (LDAs) as well as PE-conjugated monoclonal antibodies (MoAbs) against myeloid cells, overnight permeabilization and fixation (paraformaldehyde 1% and 0.05% Nonidet P40), DNase I treatment (250 Kunitz units), concentration of FITC-conjugated anti-BrdUrd MoAb (dilution 1:5), and DNA staining with 7-amino-actinomycin (7-AAD) (10 microg/ml). We validated this assay by measuring LI, Ts, and Tpot repeatedly in four leukemic cell lines and found these to be stable (coefficients of variation (CV): 0.06, 0.13, and 0.08, respectively). Finally, we employed the assay on different leukocyte preparations from normal donors (including purified CD34 + cells) and patients with malignant myeloid disorders, and we concluded that it will yield valuable data regarding the cell cycle kinetics of subsets of leukocytes in heterogeneous mixtures of hematopoietic cells.

  1. Resorbable polymeric scaffolds for bone tissue engineering: the influence of their microstructure on the growth of human osteoblast-like MG 63 cells.

    Science.gov (United States)

    Pamula, Elzbieta; Filová, Elena; Bacáková, Lucie; Lisá, Vera; Adamczyk, Daniel

    2009-05-01

    Degradable three-dimensional porous scaffolds applicable as cell carriers for bone tissue engineering were developed by an innovative solvent casting/particulate leaching technique from poly(L-lactide-co-glycolide) (PLG). Three types of PLG scaffolds were prepared, and these had the same high porosity (83%) but increasing diameter of the pores (180-200 microm, 250-320 microm, and 400-600 microm) and increasing pore interconnectivity. The colonization of the scaffolds with human osteoblast-like MG 63 cells was then studied in vitro in a conventional static cell culture system. The number of cells growing on the scaffolds on days 1 and 7 after seeding was highest in the material with the largest pore diameter, but on day 15, the differences among the scaffolds disappeared. Confocal microscopy revealed that on day 1 after seeding, the cells penetrated to a depth of 490 +/- 100 microm, 720 +/- 170 microm, and 720 +/- 120 microm into the scaffolds of small, medium, and large pore size, respectively. Incorporation of bromodeoxyuridine into newly synthesized DNA and the concentration of vinculin, beta-actin, osteopontin, and osteocalcin in cells on the scaffolds of all pore sizes were similar to the values obtained on standard tissue culture polystyrene, which indicated good biocompatibility of the scaffolds. These results suggest that all scaffolds could serve as good carriers for bone cells, although the quickest colonization with cells was found in the scaffolds with the largest pore diameter from 400 to 600 microm.

  2. Analysis of neural progenitors from embryogenesis to juvenile adult in Xenopus laevis reveals biphasic neurogenesis and continuous lengthening of the cell cycle

    Directory of Open Access Journals (Sweden)

    Raphaël Thuret

    2015-12-01

    Full Text Available Xenopus laevis is a prominent model system for studying neural development, but our understanding of the long-term temporal dynamics of neurogenesis remains incomplete. Here, we present the first continuous description of neurogenesis in X. laevis, covering the entire period of development from the specification of neural ectoderm during gastrulation to juvenile frog. We have used molecular markers to identify progenitors and neurons, short-term bromodeoxyuridine (BrdU incorporation to map the generation of newborn neurons and dual pulse S-phase labelling to characterise changes in their cell cycle length. Our study revealed the persistence of Sox3-positive progenitor cells from the earliest stages of neural development through to the juvenile adult. Two periods of intense neuronal generation were observed, confirming the existence of primary and secondary waves of neurogenesis, punctuated by a period of quiescence before metamorphosis and culminating in another period of quiescence in the young adult. Analysis of multiple parameters indicates that neural progenitors alternate between global phases of differentiation and amplification and that, regardless of their behaviour, their cell cycle lengthens monotonically during development, at least at the population level.

  3. Comparison of Neurite Outgrowth Induced by Erythropoietin (EPO) and Carbamylated Erythropoietin (CEPO) in Hippocampal Neural Progenitor Cells.

    Science.gov (United States)

    Oh, Dong Hoon; Lee, In Young; Choi, Miyeon; Kim, Seok Hyeon; Son, Hyeon

    2012-08-01

    A previous animal study has shown the effects of erythropoietin (EPO) and its non-erythropoietic carbamylated derivative (CEPO) on neurogenesis in the dentate gyrus. In the present study, we sought to investigate the effect of EPO on adult hippocampal neurogenesis, and to compare the ability of EPO and CEPO promoting dendrite elongation in cultured hippocampal neural progenitor cells. Two-month-old male BALB/c mice were given daily injections of EPO (5 U/g) for seven days and were sacrificed 12 hours after the final injection. Proliferation assays demonstrated that EPO treatment increased the density of bromodeoxyuridine (BrdU)-labeled cells in the subgranular zone (SGZ) compared to that in vehicle-treated controls. Functional differentiation studies using dissociated hippocampal cultures revealed that EPO treatment also increased the number of double-labeled BrdU/microtubule-associated protein 2 (MAP2) neurons compared to those in vehicle-treated controls. Both EPO and CEPO treatment significantly increased the length of neurites and spine density in MAP2(+) cells. In summary, these results provide evidences that EPO and CEPO promote adult hippocampal neurogenesis and neuronal differentiation. These suggest that EPO and CEPO could be a good candidate for treating neuropsychiatric disorders such as depression and anxiety associated with neuronal atrophy and reduced hippocampal neurogenesis.

  4. S-phase induction by interleukin-6 followed by chemotherapy in patients with chronic lymphocytic leukemia and non-Hodgkin's lymphoma

    DEFF Research Database (Denmark)

    Brown, P D; Diamant, Marcus; Jensen, P O

    1999-01-01

    Interleukin-6 (IL-6) has in vitro demonstrated growth regulatory effects on tumor cells from patients with chronic lymphocytic leukemia (CLL) and lymphoma. The proliferation rate of these cells is usually very low and this is thought to be one of the reasons for the lack of a curative potential...... of cytostatic chemotherapy in CLL and low grade NHL. Recombinant human (rh) IL-6 might increase the in vivo proliferation rate leading to a higher sensitivity for chemotherapy. We tested this hypothesis by administering rhIL-6 to 9 CLL patients and 3 NHL patients in doses of 2.5 micrograms/kg, 5 micrograms....../kg and 10 micrograms/kg s.c. daily for 5 days followed by CHOP chemotherapy on the last day of rhIL-6 injection. Six patients had two treatment cycles. The proportion of cells in S-phase was determined by the bromodeoxyuridine labeling index (LI). Three patients achieved a partial remission, one patient had...

  5. A study of parabens and bisphenol A in surface water and fish brain tissue from the Greater Pittsburgh Area.

    Science.gov (United States)

    Renz, Lara; Volz, Conrad; Michanowicz, Drew; Ferrar, Kyle; Christian, Charles; Lenzner, Diana; El-Hefnawy, Talal

    2013-05-01

    Pollution from xenoestrogens has been discovered in the aquatic environment of the Greater Pittsburgh Area and is suspected to be caused by the failing sewer system. Personal care products and plasticizers have the potential to enter the water supply though treated and untreated sewage. Many of these compounds are suspected xenoestrogens. Paraben detection in surface waters was as follows: methyl paraben ranged between 2.2 to 17.3 ppt; ethyl paraben was not detectable; propyl paraben was detected at 9.2 and 12.0 ppt; butyl paraben was detected at 0.2 ppt. BPA was detected between 0.6 and 15.4 ppt. Estrogenic potential of extracts from fish brain tissue was tested via Bromodeoxyuridine MCF-7 analysis and paired with HPLC-MS to investigate the presence of xenoestrogens. All samples were non-detectable for parabens. BPA was detected in 44 of the 58 samples, with a range from non-detectable to 120 pg/g. BCFs were calculated. Results were statistically significant for location of capture (p < 0.05) and correlation existed between estrogenicity and BPA.

  6. Mitosis orientation in prostate epithelial cells changed by endocrine effect

    Institute of Scientific and Technical Information of China (English)

    Xiang-yun LIU; Dong-mei Li; Xiao-fang ZHANG; Jian-hui WU; Zu-yue SUN

    2008-01-01

    Aim: The aim of the present study was to investigate the effect of androgen and estrogen on mitosis orientation in the prostate epithelial cells of male rats. Methods: Castrated rats were treated with a single injection of testosterone propionate (TP) or benzogynestry (E2). There were 8 rats in the control group and TP-treated or E2-treated group. Prostate, liver, a specimen of skin, and a segment of the jejunum and colon were removed after the corresponding treatment. The results were observed through immunohistochemistry and iron hematoxylin-eosin staining.Results: All mitoses found in the prostate epithelial cells of castrated rats with TP were oriented parallel to the basement membrane; however, mitoses found in the prostate epithelial cells of castrated rats in E2 and the control group were oriented perpendicular to the basement membrane. TP treatment resulted in marked changes in mitosis orientation in the prostate epithelial cells. Bromodeoxyuridine-labeled positive cells could be seen throughout the stroma and prostate epithelial cells with an injection of TP; however, the positive cells could only be seen in the stroma of prostate with an injection of E2, and the positive cells could hardly be seen in the control group. Conclusion: We found a novel effect of TP in the prostate as a marked change of mitosis orientation in prostate epithelial cells.

  7. Differential Apoptosis Radiosensitivity of Neural Progenitors in Adult Mouse Hippocampus

    Directory of Open Access Journals (Sweden)

    Yu-Qing Li

    2016-06-01

    Full Text Available Mammalian tissue-specific stem cells and progenitors demonstrate differential DNA damage response. Neural progenitors in dentate gyrus of the hippocampus are known to undergo apoptosis after irradiation. Using a mouse model of hippocampal neuronal development, we characterized the apoptosis sensitivity of the different neural progenitor subpopulations in adult mouse dentate gyrus after irradiation. Two different bromodeoxyuridine incorporation paradigms were used for cell fate mapping. We identified two apoptosis sensitive neural progenitor subpopulations after irradiation. The first represented non-proliferative and non-newborn neuroblasts and immature neurons that expressed doublecortin, calretinin or both. The second consisted of proliferative intermediate neural progenitors. The putative radial glia-like neural stem cells or type-1 cells, regardless of proliferation status, were apoptosis resistant after irradiation. There was no evidence of radiation-induced apoptosis in the absence of the Trp53 (p53 gene but absence of Cdkn1a (p21 did not alter the apoptotic response. Upregulation of nuclear p53 was observed in neuroblasts after irradiation. We conclude that adult hippocampal neural progenitors may demonstrate differential p53-dependent apoptosis sensitivity after irradiation.

  8. Marker evaluation of human breast and bladder cancers

    Energy Technology Data Exchange (ETDEWEB)

    Mayall, B.H.; Carroll, P.R.; Chen, Ling-Chun; Cohen, M.B.; Goodson, W.H. III; Smith, H.S.; Waldman, F.M. (California Univ., San Francisco, CA (USA))

    1990-11-02

    We are investigating multiple markers in human breast and bladder cancers. Our aim is to identify markers that are clinically relevant and that contribute to our understanding of the disease process in individual patients. Good markers accurately assess the malignant potential of a cancer in an individual patient. Thus, they help identify those cancers that will recur, and they may be used to predict more accurately time to recurrence, response to treatment, and overall prognosis. Therapy and patient management may then be optimized to the individual patient. Relevant markers reflect the underlying pathobiology of individual tumors. As a tissue undergoes transformation from benign to malignant, the cells lose their differentiated phenotype. As a generalization, the more the cellular phenotype, cellular proliferation and cellular genotype depart from normal, the more advanced is the tumor in its biological evolution and the more likely it is that the patient has a poor prognosis. We use three studies to illustrate our investigation of potential tumor markers. Breast cancers are labeled in vivo with 5-bromodeoxyuridine (BrdUrd) to give a direct measure of the tumor labeling index. Bladder cancers are analyzed immunocytochemically using an antibody against proliferation. Finally, the techniques of molecular genetics are used to detect allelic loss in breast cancers. 6 refs., 3 figs.

  9. Inhibition of Viability, Proliferation, Cytokines Secretion, Surface Antigen Expression, and Adipogenic and Osteogenic Differentiation of Adipose-Derived Stem Cells by Seven-Day Exposure to 0.5 T Static Magnetic Fields

    Directory of Open Access Journals (Sweden)

    Jian Wang

    2016-01-01

    Full Text Available After seven-day exposure to 0.5-Tesla Static Magnetic Field (SMF, Adipose-derived Stem Cells (ASCs and those labeled by superparamagnetic iron oxide (SPIO nanoparticles were examined for viability by methyl thiazol tetrazolium (MTT assay, proliferation by cell counting and bromodeoxyuridine (BrdU incorporation, DNA integrity by single cell gel electrophoresis, surface antigen by flow cytometry analysis, and the expression of cytokines and genetic markers by reverse transcription-PCR and underwent adipogenic and osteogenic differentiation assessed by quantifying related specific genes expression. The SMF slightly reduced cell viability and proliferation and inhibited the expression of CD49d, CD54, and CD73 but did not damage DNA integrity. The SMF slightly downregulated the expression of cytokines including Vascular Endothelial Growth Factor (VEGF, Insulin-like Growth Factor-1 (IGF-1, Transforming Growth Factor Beta 1 (TGF-β1, genetic markers comprising Stem Cell Antigen-1 (Sca1, Octamer-4 (Oct-4, ATP-binding Cassette Subfamily B Member 1 (ABCB1, adipogenic marker genes containing Lipoprotein Lipase (LPL, Peroxisome Proliferator-Activated Receptor Gamma (PPAR-γ, and osteogenic marker genes including Secreted Phosphor-protein 1 (SPP1 and Osterix (OSX. Exposure to 0.5 T SMF for seven days inhibited viability, proliferation, surface antigen expression, cytokine secretion, stem cell genetic marker expression, and adipogenic and osteogenic differentiation but did not affect the DNA integrity in ASCs with or without SPIO labeling.

  10. Regeneration in Macrostomum lignano (Platyhelminthes): cellular dynamics in the neoblast stem cell system.

    Science.gov (United States)

    Nimeth, Katharina Theresia; Egger, Bernhard; Rieger, Reinhard; Salvenmoser, Willi; Peter, Roland; Gschwentner, Robert

    2007-03-01

    Neoblasts are potentially totipotent stem cells and the only proliferating cells in adult Platyhelminthes. We have examined the cellular dynamics of neoblasts during the posterior regeneration of Macrostomum lignano. Double-labeling of neoblasts with bromodeoxyuridine and the anti-phospho histone H3 mitosis marker has revealed a complex cellular response in the first 48 h after amputation; this response is different from that known to occur during regeneration in triclad platyhelminths and in starvation/feeding experiments in M. lignano. Mitotic activity is reduced during the first 8 h of regeneration but, at 48 h after amputation, reaches almost twice the value of control animals. The total number of S-phase cells significantly increases after 1 day of regeneration. A subpopulation of fast-cycling neoblasts surprisingly shows the same dynamics during regeneration as those in control animals. Wound healing and regeneration are accompanied by the formation of a distinct blastema. These results present new insights, at the cellular level, into the early regeneration of rhabditophoran Platyhelminthes.

  11. Active bacterial community structure along vertical redox gradients in Baltic Sea sediment

    Energy Technology Data Exchange (ETDEWEB)

    Jansson, Janet; Edlund, Anna; Hardeman, Fredrik; Jansson, Janet K.; Sjoling, Sara

    2008-05-15

    Community structures of active bacterial populations were investigated along a vertical redox profile in coastal Baltic Sea sediments by terminal-restriction fragment length polymorphism (T-RFLP) and clone library analysis. According to correspondence analysis of T-RFLP results and sequencing of cloned 16S rRNA genes, the microbial community structures at three redox depths (179 mV, -64 mV and -337 mV) differed significantly. The bacterial communities in the community DNA differed from those in bromodeoxyuridine (BrdU)-labeled DNA, indicating that the growing members of the community that incorporated BrdU were not necessarily the most dominant members. The structures of the actively growing bacterial communities were most strongly correlated to organic carbon followed by total nitrogen and redox potentials. Bacterial identification by sequencing of 16S rRNA genes from clones of BrdU-labeled DNA and DNA from reverse transcription PCR (rt-PCR) showed that bacterial taxa involved in nitrogen and sulfur cycling were metabolically active along the redox profiles. Several sequences had low similarities to previously detected sequences indicating that novel lineages of bacteria are present in Baltic Sea sediments. Also, a high number of different 16S rRNA gene sequences representing different phyla were detected at all sampling depths.

  12. Chlorella vulgaris triggers apoptosis in hepatocarcinogenesis-induced rats

    Institute of Scientific and Technical Information of China (English)

    Emey Suhana MOHD AZAMAI; Suhaniza SULAIMAN; Shafina Hanim MOHD HABIB; Mee Lee LOOI; Srijit DAS; Nor Aini ABDUL HAMID; Wan Zurinah WANG NGAH; Yasmin Anum MOHD YUSOF

    2009-01-01

    Chlorella vulgaris (CV) has been reported to have antioxidant and anticancer properties. We evaluated the effect of CV on apoptotic regulator protein expression in liver cancer-induced rats. Male Wistar rats (200-250 g) were divided into eight groups: control group (normal diet), CDE group (choline deficient diet supplemented with ethionine in drinking water to induce hepatocarcinogenesis), CV groups with three different doses of CV (50, 150, and 300 mg/kg body weight), and CDE groups treated with different doses of CV (50, 150, and 300 mg/kg body weight). Rats were sacrificed at various weeks and liver tissues were embedded in paraffin blocks for immunohistochemistry studies. CV, at increasing doses, decreased the expression of anti-apoptotic protein, Bcl-2, but increased the expression of pro-apoptotic protein, caspase 8, in CDE rats, which was correlated with decreased hepatoctyes proliferation and increased apoptosis as determined by bromodeoxy-uridine (BrdU) labeling and terminal deoxynucleotidyl transferase mediated dUTP nick-end labeling (TUNEL) assay, respectively. Our study shows that CV has definite chemopreventive effect by inducing apoptosis via decreasing the expression of Bcl-2 and increasing the expression of caspase 8 in hepatocarcinogenesis-induced rats.

  13. Synchrotron infrared spectromicroscopy as a novel bioanalytical microprobe for individual living cells: Cytotoxicity considerations

    Energy Technology Data Exchange (ETDEWEB)

    Holman, Hoi-Ying N.; Bjornstad, Kathleen A.; McNamara, Morgan P.; Martin, Michael C.; McKinney, Wayne R.; Blakely, Eleanor A.

    2001-12-12

    Synchrotron radiation-based Fourier transform infrared (SR-FTIR) spectromicroscopy is a newly emerging analytical tool capable of monitoring the biochemistry within an individual living mammalian cell in real time. This unique technique provides infrared (IR)spectra, hence chemical information, with high signal-to-noise at spatial resolutions as fine as 3 to 10 microns. Mid-IR photons are too low in energy (0.05-0.5 eV) to either break bonds or to cause ionization, and the synchrotron IR beam has been shown to produce minimal sample heating. However, an important question remains, ''Does the intense synchrotron beam induce any cytotoxic effects in living cells?'' In this work, we present the results from a series of standard biological assays to evaluate any short-and/or long-term effects on cells exposed to the synchrotron radiation-based infrared (SR-IR) beam. Cell viability was tested using alcian blue dye-exclusion and colony formation assays. Cell-cycle progression was tested with bromodeoxyuridine (BrdU) uptake during DNA synthesis. Cell metabolism was tested using an 3-[4,5-Dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide assay. All control, 5-, 10-, and 20-minute SR-IR exposure tests (267 total and over 1000 controls) show no evidence of cytotoxic effects. Concurrent infrared spectra obtained with each experiment confirm no detectable chemistry changes between control and exposed cells.

  14. Cell cycle requirements for transduction by foamy virus vectors compared to those of oncovirus and lentivirus vectors.

    Science.gov (United States)

    Trobridge, Grant; Russell, David W

    2004-03-01

    Retroviral vectors based on foamy viruses (FV) are efficient gene delivery vehicles for therapeutic and research applications. While previous studies have shown that FV vectors transduce quiescent cell cultures more efficiently than oncoviral vectors, their specific cell cycle requirements have not been determined. Here we compare the transduction frequencies of FV vectors with those of onco- and lentiviral vectors in nondividing and dividing normal human fibroblasts by several methods. FV vectors transduced serum-deprived fibroblast cultures more efficiently than oncoretroviral vectors and at rates comparable to those of lentiviral vectors. However, in these cultures FV vectors only transduced a subpopulation of proliferating cells, as determined by bromodeoxyuridine staining for DNA synthesis. In contrast to lentiviral vectors, FV vectors were unable to transduce human fibroblasts arrested by aphidicolin (G(1)/S phase) or gamma-irradiation (G(2) phase), and a partial cell cycle that included mitosis but not DNA synthesis was required. We could not determine if mitosis facilitated nuclear entry of FV vectors, since cell-free vector preparations contained long terminal repeat circles, precluding their use as nuclear markers. In contrast to oncoviral vectors, both FV and lentiviral vectors efficiently transduced G(0) fibroblasts that were later stimulated to divide. In the case of FV vectors, this was due to the persistence of a stable transduction intermediate in quiescent cells. Our findings support the use of FV vectors as a safe and effective alternative to lentiviral vectors for ex vivo transduction of stem cells that are quiescent during culture but divide following transplantation.

  15. A new look at an old visual system: structure and development of the compound eyes and optic ganglia of the brine shrimp Artemia salina Linnaeus, 1758 (Branchiopoda, anostraca).

    Science.gov (United States)

    Wildt, Miriam; Harzsch, Steffen

    2002-08-01

    Compared to research carried out on decapod crustaceans, the development of the visual system in representatives of the entomostracan crustaceans is poorly understood. However, the structural evolution of the arthropod visual system is an important topic in the new debate on arthropod relationships, and entomostracan crustaceans play a key role in this discussion. Hence, data on structure and ontogeny of the entomostracan visual system are likely to contribute new aspects to our understanding of arthropod phylogeny. Therefore, we explored the proliferation of neuronal stem cells (in vivo incorporation of bromodeoxyuridine) and the developmental expression of synaptic proteins (immunohistochemistry against synapsins) in the developing optic neuropils of the brine shrimp Artemia salina Linnaeus, 1758 (Crustacea, Entomostraca, Branchiopoda, Anostraca) from hatching to adulthood. The morphology of the adult visual system was examined in serial sections of plastic embedded specimens. Our results indicate that the cellular material that gives rise to the visual system (compound eyes and two optic ganglia) is contributed by the mitotic activity of neuronal stem cells that are arranged in three band-shaped proliferation zones. Synapsin-like immunoreactivity in the lamina ganglionaris and the medulla externa initiated only after the anlagen of the compound eyes had already formed, suggesting that the emergence of the two optic neuropils lags behind the proliferative action of these stem cells. Neurogenesis in A. salina is compared to similar processes in malacostracan crustaceans and possible phylogenetic implications are discussed.

  16. The Gs-linked receptor GPR3 inhibits the proliferation of cerebellar granule cells during postnatal development.

    Directory of Open Access Journals (Sweden)

    Shigeru Tanaka

    Full Text Available BACKGROUND: During postnatal murine and rodent cerebellar development, cerebellar granule precursors (CGP gradually stop proliferating as they differentiate after migration to the internal granule layer (IGL. Molecular events that govern this program remain to be fully elucidated. GPR3 belongs to a family of Gs-linked receptors that activate cyclic AMP and are abundantly expressed in the adult brain. METHODOLOGY/PRINCIPAL FINDINGS: To investigate the role of this orphan receptor in CGP differentiation, we determined that exogenous GPR3 expression in rat cerebellar granule neurons partially antagonized the proliferative effect of Sonic hedgehog (Shh, while endogenous GPR3 inhibition by siRNA stimulated Shh-induced CGP proliferation. In addition, exogenous GPR3 expression in CGPs correlated with increased p27/kip expression, while GPR3 knock-down led to a decrease in p27/kip expression. In wild-type mice, GPR3 expression increased postnatally and its expression was concentrated in the internal granular layer (IGL. In GPR3 -/- mice, the IGL was widened with increased proliferation of CGPs, as measured by bromodeoxyuridine incorporation. Cell cycle kinetics of GPR3-transfected medulloblastoma cells revealed a G0/G1 block, consistent with cell cycle exit. CONCLUSIONS/SIGNIFICANCE: These results thus indicate that GPR3 is a novel antiproliferative mediator of CGPs in the postnatal development of murine cerebellum.

  17. Picropodophyllin inhibits the growth of Ewing's sarcoma cells through the insulin‑like growth factor‑1 receptor/Akt signaling pathway.

    Science.gov (United States)

    Wu, Yong-Tao; Wang, Bao-Jun; Miao, Sheng-Wu; Gao, Jian-Jun

    2015-11-01

    Ewing's sarcoma (ES) is the second most common type of pediatric bone tumor, and is associated with a poor prognosis. Picropodophyllin (PPP), a novel selective inhibitor of insulin‑like growth factor‑1 receptor (IGF‑1R), is able to strongly inhibit various types of cancers. However, the effect of IGF‑1R on ES remains unclear. Following treatment with various concentrations of PPP for various times, cell viability was determined using an MTT assay. In addition, cell proliferation and apoptosis was investigated separately by bromodeoxyuridine staining and flow cytometry, respectively. The PPP‑associated signaling pathway was also investigated. The results of the present study suggested that PPP inhibited cell proliferation and viability of A673 and SK‑ES‑1 human Ewing's sarcoma cells in a dose- and time‑dependent manner. In addition, cell apoptosis rates were increased following treatment with PPP. Further investigation of the underlying mechanism revealed that PPP inhibited Akt phosphorylation. Fumonisin B1, an Akt‑specific activator, reversed the inhibitory effects of PPP on cell growth. Furthermore, the results suggested that PPP decreased the expression levels of IGF‑1R, a common activator of Akt signaling. PPP inhibited the growth of human Ewing's sarcoma cells by targeting the IGF‑1R/Akt signaling pathway. Therefore, PPP may prove useful in the development of an effective strategy for the treatment of Ewing's sarcoma.

  18. BrdU Pulse Labelling In Vivo to Characterise Cell Proliferation during Regeneration and Repair following Injury to the Airway Wall in Sheep

    Directory of Open Access Journals (Sweden)

    B. Yahaya

    2013-01-01

    Full Text Available The response of S-phase cells labelled with bromodeoxyuridine (BrdU in sheep airways undergoing repair in response to endobronchial brush biopsy was investigated in this study. Separate sites within the airway tree of anaesthetised sheep were biopsied at intervals prior to pulse labelling with BrdU, which was administered one hour prior to euthanasia. Both brushed and spatially disparate unbrushed (control sites were carefully mapped, dissected, and processed to facilitate histological analysis of BrdU labelling. Our study indicated that the number and location of BrdU-labelled cells varied according to the age of the repairing injury. There was little evidence of cell proliferation in either control airway tissues or airway tissues examined six hours after injury. However, by days 1 and 3, BrdU-labelled cells were increased in number in the airway wall, both at the damaged site and in the regions flanking either side of the injury. Thereafter, cell proliferative activity largely declined by day 7 after injury, when consistent evidence of remodelling in the airway wall could be appreciated. This study successfully demonstrated the effectiveness of in vivo pulse labelling in tracking cell proliferation during repair which has a potential value in exploring the therapeutic utility of stem cell approaches in relevant lung disease models.

  19. Apoptosis of wound fibroblasts induced by oxidative stress.

    Science.gov (United States)

    Takahashi, Atsushi; Aoshiba, Kazutetsu; Nagai, Atsushi

    2002-06-01

    Irreversible lung parenchymal injury is usually healed by fibrosis, which depends on the abilities of fibroblasts to proliferate, migrate into the wound, and survive. Because the lung is frequently exposed to increased oxidative stress, which is thought to mediate apoptosis, we examined whether oxidative stress induces apoptosis in fibroblasts during wound healing. We performed an in vitro scratch wound assay where cultured fibroblast monolayers were exposed to H2O2 (10-500 microM) after artificial wounding. Apoptosis was evaluated by nuclear staining with Hoechst33342 or terminal deoxynucleotidyl transferase (TdT)-mediated nucleotide nick end-labeling (TUNEL). Intracellular oxidants were assessed with the peroxide-sensitive fluorochrome carboxydichlorodihydrofluorescein (CDCF). We found that repopulating fibroblasts at the wound margin, but not quiescent fibroblasts at the intact site, selectively underwent oxidant accumulation and apoptosis in response to H2O2 exposure. Some of the apoptotic cells had incorporated bromodeoxyuridine (BrdU), an indicator of proliferating cells. These results suggest that oxidative stress selectively induces apoptosis in fibroblasts that are stimulated to proliferate and/or migrate into the wound. Fibroblast apoptosis induced by oxidative stress during wound repopulation may be relevant to intractable wound healing.

  20. Lithium increases proliferation of hippocampal neural stem/progenitor cells and rescues irradiation-induced cell cycle arrest in vitro.

    Science.gov (United States)

    Zanni, Giulia; Di Martino, Elena; Omelyanenko, Anna; Andäng, Michael; Delle, Ulla; Elmroth, Kecke; Blomgren, Klas

    2015-11-10

    Radiotherapy in children causes debilitating cognitive decline, partly linked to impaired neurogenesis. Irradiation targets primarily cancer cells but also endogenous neural stem/progenitor cells (NSPCs) leading to cell death or cell cycle arrest. Here we evaluated the effects of lithium on proliferation, cell cycle and DNA damage after irradiation of young NSPCs in vitro.NSPCs were treated with 1 or 3 mM LiCl and we investigated proliferation capacity (neurosphere volume and bromodeoxyuridine (BrdU) incorporation). Using flow cytometry, we analysed apoptosis (annexin V), cell cycle (propidium iodide) and DNA damage (γH2AX) after irradiation (3.5 Gy) of lithium-treated NSPCs.Lithium increased BrdU incorporation and, dose-dependently, the number of cells in replicative phase as well as neurosphere growth. Irradiation induced cell cycle arrest in G1 and G2/M phases. Treatment with 3 mM LiCl was sufficient to increase NSPCs in S phase, boost neurosphere growth and reduce DNA damage. Lithium did not affect the levels of apoptosis, suggesting that it does not rescue NSPCs committed to apoptosis due to accumulated DNA damage.Lithium is a very promising candidate for protection of the juvenile brain from radiotherapy and for its potential to thereby improve the quality of life for those children who survive their cancer.

  1. Effect of controlled release of brain-derived neurotrophic factor and neurotrophin-3 from collagen gel on neural stem cells.

    Science.gov (United States)

    Huang, Fei; Wu, Yunfeng; Wang, Hao; Chang, Jun; Ma, Guangwen; Yin, Zongsheng

    2016-01-20

    This study aimed to examine the effect of controlled release of brain-derived neurotrophic factor (BDNF) and neurotrophin-3 (NT-3) from collagen gel on rat neural stem cells (NSCs). With three groups of collagen gel, BDNF/collagen gel, and NT-3/collagen gel as controls, BDNF and NT-3 were tested in the BDNF-NT-3/collagen gel group at different time points. The enzyme-linked immunosorbent assay results showed that BDNF and NT-3 were steadily released from collagen gels for 10 days. The cell viability test and the bromodeoxyuridine incorporation assay showed that BDNF-NT-3/collagen gel supported the survival and proliferation of NSCs. The results also showed that the length of processes was markedly longer and differentiation percentage from NSCs into neurons was much higher in the BDNF-NT-3/collagen gel group than those in the collagen gel, BDNF/collagen gel, and NT-3/collagen gel groups. These findings suggest that BDNF-NT-3/collagen gel could significantly improve the ability of NSCs proliferation and differentiation.

  2. Effects of anti-IgM suppression on polyclonally activated murine B cells: analysis of immunoglobulin mRNA, gene specific nuclear factors and cell cycle distribution.

    Science.gov (United States)

    Marcuzzi, A; Van Ness, B; Rouse, T; Lafrenz, D

    1989-01-01

    Polyclonal activation of murine B cells with bacterial lipopolysaccharide (LPS) and dextran sulfate (DxS) results in cell proliferation as well as increased immunoglobulin gene transcription and antibody secretion. When added to B cell cultures during mitogen activation, anti-mu antibody suppresses the rate of proliferation and immunoglobulin gene expression. Using this model system we show that co-cultures of B cells with LPS/DxS and anti-mu resulted in a decrease of both mu and kappa chain mRNA. Suppression did not prevent B cell entry into cycle nor a significant alteration in the distribution of cells in phases of cell cycle, although it did prolong the cycle transit time in a dose dependent fashion as determined by bromodeoxyuridine pulse labelling. Analysis of B cell specific nuclear binding factors, which previously have been shown to be important in regulating immunoglobulin gene transcription were examined. Results show that the kappa-specific enhancer binding activity of NF-kappa B was induced in activated as well as suppressed cultures. The lymphoid specific factor NF-A2, which recognizes the octamer sequence motif in the promoters of immunoglobulin genes, was induced by the polyclonal activation but was selectively lost in extracts from suppressed cells. Thus, specific regulation of the nuclear factor which plays a critical role in both heavy and light chain immunoglobulin gene expression may contribute to the transcriptional suppression observed in anti-mu treated B cells. Images PMID:2481271

  3. Contribution of constitutively proliferating precursor cell subtypes to dentate neurogenesis after cortical infarcts

    Directory of Open Access Journals (Sweden)

    Oberland Julia

    2010-11-01

    Full Text Available Abstract Background It is well known that focal ischemia increases neurogenesis in the adult dentate gyrus of the hippocampal formation but the cellular mechanisms underlying this proliferative response are only poorly understood. We here investigated whether precursor cells which constitutively proliferate before the ischemic infarct contribute to post-ischemic neurogenesis. To this purpose, transgenic mice expressing green fluorescent protein (GFP under the control of the nestin promoter received repetitive injections of the proliferation marker bromodeoxyuridine (BrdU prior to induction of cortical infarcts. We then immunocytochemically analyzed the fate of these BrdU-positive precursor cell subtypes from day 4 to day 28 after the lesion. Results Quantification of BrdU-expressing precursor cell populations revealed no alteration in number of radial glia-like type 1 cells but a sequential increase of later precursor cell subtypes in lesioned animals (type 2a cells at day 7, type 3 cells/immature neurons at day 14. These alterations result in an enhanced survival of mature neurons 4 weeks postinfarct. Conclusions Focal cortical infarcts recruit dentate precursor cells generated already before the infarct and significantly contribute to an enhanced neurogenesis. Our findings thereby increase our understanding of the complex cellular mechanisms of postlesional neurogenesis.

  4. Up-regulation of P2X7 receptors mediating proliferation of Schwann cells after sciatic nerve injury.

    Science.gov (United States)

    Song, Xian-min; Xu, Xiao-hui; Zhu, Jiao; Guo, Zhili; Li, Jian; He, Cheng; Burnstock, Geoffrey; Yuan, Hongbin; Xiang, Zhenghua

    2015-06-01

    Peripheral nerve injury (PNI) is a common disease, which results in a partial or total loss of motor, sensory and autonomic functions, leading to a decrease in quality of life. Schwann cells play a vital role in maintaining the peripheral nervous system and in injury and repair. Using immunohistochemistry, Western blot, calcium assay and bromodeoxyuridine (BrdU) proliferation assay, the present study clearly demonstrated that P2X7 receptors (R) were expressed in myelinating and non-myelinating Schwann cells in longitudinal sections of sciatic nerves. After sciatic nerve injury (SNI), P2X7R expression in Schwann cells of injured sciatic nerves was significantly up-regulated during the early days of SNI. Double immunofluorescence of proliferating cell nuclear antigen (PCNA) and P2X7R implied that P2X7R may be involved in proliferation of Schwann cells. Further experiments on primary cultures of Schwann cells showed that P2X7R are functionally expressed in Schwann cells of rat sciatic nerves; ATP via P2X7R can promote Schwann cell proliferation, possibly via the MAPK/ERK intracellular signalling pathway. Other possible roles of P2X7R on Schwann cells are discussed.

  5. Bcl-2 enhances the formation of newborn striatal long-projection neurons in adult rat brain after a transient ischemic stroke

    Institute of Scientific and Technical Information of China (English)

    Jian-Jun Guo; Fang Liu; Xiao Sun; Jun-Jie Huang; Ming Xu; Feng-Yan Sun

    2012-01-01

    Objective It has been reported that B-cell lymphoma 2 (Bcl-2) enhances neurogenesis as well as supporting axonal growth after injury.In the present study,we investigated whether Bcl-2 overexpression plays a role in the formation of newborn striatonigral projection neurons in the adult rat brain after transient middle cerebral artery occlusion (MCAO).Methods We infused human Bcl-2-expressing plasmid (pBcl-2) into the lateral ventricle immediately after 30 min of MCAO,injected 5'-bromodeoxyuridine (BrdU) intraperitoneally to label proliferative cells,and microinjected fluorogold (FG) into the substantia nigra at 11 weeks of reperfusion followed by multiple immunostaining of striatonigral projection neurons at 12 weeks.Results We found that pBcl-2 treatment significantly increased the number of newborn neurons (BrdU+-NeuN+) in the striatum ipsilateral to the MCAO.We further detected newborn striatonigral projection neurons (BrdU+-FG+-NeuN+) in the ipsilateral striatum at 12 weeks.More interestingly,the number of newborn striatonigral projection neurons (BrdU+-FG+) was significantly increased by pBcl-2 treatment compared to that by pEGFP,a control plasmid.Conclusion Taken together,we found that Bcl-2 overexpression in the brain enhanced the generation of newborn striatonigral projection neurons.This provides a potential strategy for promoting the reestablishment of neural networks and brain repair after ischemic injury.

  6. Effects of exercise on neurogenesis in the dentate gyrus and ability of learning and memory after hippocampus lesion in adult rats

    Institute of Scientific and Technical Information of China (English)

    Lin CHEN; Shan GONG; Li-Dong SHAN; Wei-Ping XU; Yue-Jin ZHANG; Shi-Yu GUO; Tadashi Hisamitsu; Qi-Zhang YIN; Xing-Hong JIANG

    2006-01-01

    Objective To explore the effects of exercise on dentate gyrus (DG) neurogenesis and the ability of learning and memory in hippocampus-lesioned adult rats. Methods Hippocampus lesion was produced by intrahippocampal microinjection of kainic acid (KA). Bromodeoxyuridine (BrdU) was used to label dividing cells. Y maze test was used to evaluate the ability of learning and memory. Exercise was conducted in the form of forced running in a motor-driven running wheel. The speed of wheel revolution was regulated at 3 kinds of intensity: lightly running, moderately running, or heavily running. Results Hippocampus lesion could increase the number of BrdU-labeled DG cells, moderately running after lesion could further enhance the number of BrdU-labeled cells and decrease the error number (EN) in Y maze test,while neither lightly running, nor heavily running had such effects. There was a negative correlation between the number of DG BrdU-labeled cells and the EN in the Y maze test after running. Conclusion Moderate exercise could enhance the DG neurogenesis and ameliorate the ability of learning and memory in hippocampus-lesioned rats.

  7. Further characterization of the genotoxicity of formaldehyde in vitro by the sister chromatid exchange test and co-cultivation experiments.

    Science.gov (United States)

    Neuss, Simone; Speit, Günter

    2008-09-01

    The induction of sister chromatid exchanges (SCE) was used to further characterize the genotoxic action of formaldehyde (FA) on cultured mammalian cells. FA induced SCE in V79 Chinese hamster cells and A549 human lung cells in a concentration-related manner. Addition of 5-bromodeoxyuridine (BrdUrd) for the differentiation of sister chromatids to visualize SCE 4 h after the FA treatment led to a clearly reduced induction of SCE in agreement with the repair kinetics of FA-induced DNA-protein cross-links. When A549 cells were treated with FA for 1 h and then co-cultivated with V79 cells in the presence of BrdUrd, a clear induction of SCE was measured in V79 cells. When the same experiment was performed including washing and change of medium after the FA treatment, no induction of SCE was measured in V79 cells. These results indicate that reactive FA remains in the cell culture medium for a longer time period despite the high reactivity of FA with macromolecules. However, FA that has entered a cell is not released and does not damage other cells. Possible implications for the mutagenicity of FA in vivo will be discussed.

  8. Chick embryo proliferation studies using EdU labeling.

    Science.gov (United States)

    Warren, Michelle; Puskarczyk, Karolina; Chapman, Susan C

    2009-04-01

    Cell proliferation studies are an important experimental tool. The most commonly used thymidine analogues, tritiated thymidine and bromodeoxyuridine (BrdU) label cells during S-phase. Both methods have significant drawbacks: low sensitivity in the case of tritiated thymidine and a denaturation step during BrdU detection that destroys most cellular epitopes, requiring careful optimization. The antibody against BrdU is also large and tissue penetration can be difficult. EdU (5'-ethynyl-2'-deoxyuridine) is closely chemically related to BrdU, with detection achieved by a copper catalyzed reaction requiring a small fluorescently conjugated azide. Cell cultures, flow cytometry and high throughput studies using EdU-labeled cells is exceptionally fast and does not require denaturation or antibodies. We have developed a tissue-labeling technique in chick embryos using EdU. Following EdU chemistry to detect proliferating cells, the tissue can undergo immunolabeling. We demonstrate fluorescent EdU chemistry followed by Tuj1 antibody staining resulting in multiplex fluorescent tissues.

  9. A rapid non-radioactive technique for measurement of repair synthesis in primary human fibroblasts by incorporation of ethynyl deoxyuridine (EdU).

    Science.gov (United States)

    Limsirichaikul, Siripan; Niimi, Atsuko; Fawcett, Heather; Lehmann, Alan; Yamashita, Shunichi; Ogi, Tomoo

    2009-03-01

    Xeroderma pigmentosum (XP) is an autosomal recessive genetic disorder. Afflicted patients show extreme sun-sensitivity and skin cancer predisposition. XP is in most cases associated with deficient nucleotide excision repair (NER), which is the process responsible for removing photolesions from DNA. Measuring NER activity by nucleotide incorporation into repair patches, termed 'unscheduled DNA synthesis (UDS)', is one of the most commonly used assays for XP-diagnosis and NER research. We have established a rapid and accurate procedure for measuring UDS by replacement of thymidine with 5-ethynyl-2'-deoxyuridine (EdU). EdU incorporated into repair patches can be directly conjugated to fluorescent azide derivatives, thereby obviating the need for either radiolabeled thymidine or denaturation and antibody detection of incorporated bromodeoxyuridine (BrdU). We demonstrate that the EdU incorporation assay is compatible with conventional techniques such as immunofluorescent staining and labeling of cells with micro-latex beads. Importantly, we can complete the entire UDS assay within half a day from preparation of the assay coverslips; this technique may prove useful as a method for XP diagnosis.

  10. Suppression of tumor necrosis factor receptor-associated protein 1 expression induces inhibition of cell proliferation and tumor growth in human esophageal cancer cells.

    Science.gov (United States)

    Tian, Xin; Ma, Ping; Sui, Cheng-Guang; Meng, Fan-Dong; Li, Yan; Fu, Li-Ye; Jiang, Tao; Wang, Yang; Jiang, You-Hong

    2014-06-01

    Tumor necrosis factor receptor-associated protein 1 (TRAP1) is a molecular chaperone involved in multidrug resistance and antiapoptosis in some human tumors, but its regulatory mechanisms have not been revealed in esophageal squamous cell carcinoma (ESCC). In this study, 138 specimens of ESCC were analyzed. TRAP1 was overexpressed in ESCC, particularly in poorly differentiated tumors. To further explore the molecular regulatory mechanism, we constructed specific small interfering RNA-expressing vectors targeting Trap1, and knocked down Trap1 expression in the esophageal cancer cell lines ECA109 and EC9706. Knockdown of Trap1 induced increases in reactive oxygen species and mitochondrial depolarization, which have been proposed as critical regulators of apoptosis. The cell cycle was arrested in G2/M phase, and in vitro inhibition of cell proliferation was confirmed with 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide and bromodeoxyuridine assays. Furthermore, re-expression of TRAP1 in Trap1 small interfering RNA-transfected ESCC cells restored cell proliferation and cell apoptosis. Bioluminescence of subcutaneously xenografted ESCC tumor cells demonstrated significant inhibition of in vivo tumor growth by Trap1 knockdown. This study shows that TRAP1 was overexpressed in most patients with ESCC, and caused an increase in antiapoptosis potency. TRAP1 may be regarded as a target in ESCC biotherapy.

  11. Human umbilical cord mesenchymal stem cells have neuroprotective effect on neonatal mouse periventricular leukomalacia%人脐带间充质干细胞对新生鼠脑白质软化灶的神经保护作用

    Institute of Scientific and Technical Information of China (English)

    张宁; 摆翔; 蒋犁; 李伟

    2012-01-01

    目的:探讨人脐带间充质干细胞(human umbilical cord mesenchymal stem cells,HUcMSCs),对新生未成熟鼠脑室周围白质软化灶受损神经细胞的保护作用.方法:建立新生大鼠PVL(periventricular leukomalacia)动物模型,造模后随机分为两组.于第5天(P5d)分别给两组大鼠腹腔注射5-溴脱氧尿核苷(5-bromodeoxyuridine,BrdU)标记的第二代HUcMSCs[每只1×107(0.05 ml)-1]或0.05 ml PBS无菌溶液.24 h后(P6d)处死一组大鼠,行BrdU染色观察HUcMSCs在鼠脑内的迁移;另一组于移植HUcMSCs后14 d(P19d)行微型MRI(MicroMRI)扫描观察受损区域修复程度,髓磷脂碱性蛋白(myelin basic protein,MBP)染色观察移植HUcMSCs对大鼠脑室周围脑白质损伤的保护.结果:HUcMSCs在宿主体内明显向侧脑室周围白质损伤区域迁移,且脑室周围存活少突胶质细胞数量明显多于注射PBS组,微型MRI扫描观察到HUcMSCs可缩小受损脑白质病灶,远期神经行为学观察到HUcMSCs移植组神经行为学高于PBS组(P<0.05).结论:HUcMSCs对新生大鼠PVL具有神经保护作用,可缩小病变范围.%To investigate the behavior of the homing of the human umbilical cord mesenchymal stem cells ( HUcMSCs )after intraperitoneal implantation to the premature rats with peri ventricular leukomalacia( PVL ), observe the injury volume of preterm mouse with PVL by MicroMRI and explore the neuroprotective effect. Methods: HUcMSCs were cultured in vitro, the second generation was selected. In one group, every mouse with PVL was injected HUcMSCs stained- BrdU ( bromodeoxyuridine ) ( 1× 107 /0. 05 ml ) intraperitoneally after operation. The other group was inject the 0. 05 ml bioclean PBS intraperitoneally simultaneously. The mice of two groups were put to death after 24 hours, the movement of the HUcMSCs to the damaged host brain region was observed with BrdU immunofluorescence staining, and the reduction of the injury volume after injection of HUcMSCs was measured by MBP( myelin

  12. Establishment and characterization of rat portal myofibroblast cell lines.

    Directory of Open Access Journals (Sweden)

    Michel Fausther

    Full Text Available The major sources of scar-forming myofibroblasts during liver fibrosis are activated hepatic stellate cells (HSC and portal fibroblasts (PF. In contrast to well-characterized HSC, PF remain understudied and poorly defined. This is largely due to the facts that isolation of rodent PF for functional studies is technically challenging and that PF cell lines had not been established. To address this, we have generated two polyclonal portal myofibroblast cell lines, RGF and RGF-N2. RGF and RGF-N2 were established from primary PF isolated from adult rat livers that underwent culture activation and subsequent SV40-mediated immortalization. Specifically, Ntpdase2/Cd39l1-sorted primary PF were used to generate the RGF-N2 cell line. Both cell lines were functionally characterized by RT-PCR, immunofluorescence, immunoblot and bromodeoxyuridine-based proliferation assay. First, immortalized RGF and RGF-N2 cells are positive for phenotypic myofibroblast markers alpha smooth muscle actin, type I collagen alpha-1, tissue inhibitor of metalloproteinases-1, PF-specific markers elastin, type XV collagen alpha-1 and Ntpdase2/Cd39l1, and mesenchymal cell marker ecto-5'-nucleotidase/Cd73, while negative for HSC-specific markers desmin and lecithin retinol acyltransferase. Second, both RGF and RGF-N2 cell lines are readily transfectable using standard methods. Finally, RGF and RGF-N2 cells attenuate the growth of Mz-ChA-1 cholangiocarcinoma cells in co-culture, as previously demonstrated for primary PF. Immortalized rat portal myofibroblast RGF and RGF-N2 cell lines express typical markers of activated PF-derived myofibroblasts, are suitable for DNA transfection, and can effectively inhibit cholangiocyte proliferation. Both RGF and RGF-N2 cell lines represent novel in vitro cellular models for the functional studies of portal (myofibroblasts and their contribution to the progression of liver fibrosis.

  13. Galvanic vestibular stimulation impairs cell proliferation and neurogenesis in the rat hippocampus but not spatial memory.

    Science.gov (United States)

    Zheng, Yiwen; Geddes, Lisa; Sato, Go; Stiles, Lucy; Darlington, Cynthia L; Smith, Paul F

    2014-05-01

    Galvanic vestibular stimulation (GVS) is a method of activating the peripheral vestibular system using direct current that is widely employed in clinical neurological testing. Since movement is recognized to stimulate hippocampal neurogenesis and movement is impossible without activation of the vestibular system, we speculated that activating the vestibular system in rats while minimizing movement, by delivering GVS under anesthesia, would affect hippocampal cell proliferation and neurogenesis, and spatial memory. Compared with the sham control group, the number of cells incorporating the DNA replication marker, bromodeoxyuridine (BrdU), was significantly reduced in the bilateral hippocampi in both the cathode left-anode right and cathode right-anode left stimulation groups (P ≤ 0.0001). The majority of the BrdU(+ve) cells co-expressed Ki-67, a marker for the S phase of the cell cycle, suggesting that these BrdU(+ve) cells were still in the cell cycle; however, there was no significant difference in the degree of co-labeling between the two stimulation groups. Single labeling for doublecortin (DCX), a marker of immature neurons, showed that while there was no significant difference between the different groups in the number of DCX(+ve) cells in the right dentate gryus, in the left dentate gyrus there was a significant decrease in the cathode left-anode right group compared with the sham controls (P ≤ 0.03). Nonetheless, when animals were tested in place recognition, object exploration and Morris water maze tasks, there were no significant differences between the GVS groups and the sham controls. These results suggest that GVS can have striking effects on cell proliferation and possibly neurogenesis in the hippocampus, without affecting spatial memory.

  14. Exposure to N-Ethyl-N-Nitrosourea in Adult Mice Alters Structural and Functional Integrity of Neurogenic Sites

    Science.gov (United States)

    Capilla-Gonzalez, Vivian; Gil-Perotin, Sara; Ferragud, Antonio; Bonet-Ponce, Luis; Canales, Juan Jose; Garcia-Verdugo, Jose Manuel

    2012-01-01

    Background Previous studies have shown that prenatal exposure to the mutagen N-ethyl-N-nitrosourea (ENU), a N-nitroso compound (NOC) found in the environment, disrupts developmental neurogenesis and alters memory formation. Previously, we showed that postnatal ENU treatment induced lasting deficits in proliferation of neural progenitors in the subventricular zone (SVZ), the main neurogenic region in the adult mouse brain. The present study is aimed to examine, in mice exposed to ENU, both the structural features of adult neurogenic sites, incorporating the dentate gyrus (DG), and the behavioral performance in tasks sensitive to manipulations of adult neurogenesis. Methodology/Principal Findings 2-month old mice received 5 doses of ENU and were sacrificed 45 days after treatment. Then, an ultrastructural analysis of the SVZ and DG was performed to determine cellular composition in these regions, confirming a significant alteration. After bromodeoxyuridine injections, an S-phase exogenous marker, the immunohistochemical analysis revealed a deficit in proliferation and a decreased recruitment of newly generated cells in neurogenic areas of ENU-treated animals. Behavioral effects were also detected after ENU-exposure, observing impairment in odor discrimination task (habituation-dishabituation test) and a deficit in spatial memory (Barnes maze performance), two functions primarily related to the SVZ and the DG regions, respectively. Conclusions/Significance The results demonstrate that postnatal exposure to ENU produces severe disruption of adult neurogenesis in the SVZ and DG, as well as strong behavioral impairments. These findings highlight the potential risk of environmental NOC-exposure for the development of neural and behavioral deficits. PMID:22238669

  15. Learning to learn: theta oscillations predict new learning, which enhances related learning and neurogenesis.

    Directory of Open Access Journals (Sweden)

    Miriam S Nokia

    Full Text Available Animals in the natural world continuously encounter learning experiences of varying degrees of novelty. New neurons in the hippocampus are especially responsive to learning associations between novel events and more cells survive if a novel and challenging task is learned. One might wonder whether new neurons would be rescued from death upon each new learning experience or whether there is an internal control system that limits the number of cells that are retained as a function of learning. In this experiment, it was hypothesized that learning a task that was similar in content to one already learned previously would not increase cell survival. We further hypothesized that in situations in which the cells are rescued hippocampal theta oscillations (3-12 Hz would be involved and perhaps necessary for increasing cell survival. Both hypotheses were disproved. Adult male Sprague-Dawley rats were trained on two similar hippocampus-dependent tasks, trace and very-long delay eyeblink conditioning, while recording hippocampal local-field potentials. Cells that were generated after training on the first task were labeled with bromodeoxyuridine and quantified after training on both tasks had ceased. Spontaneous theta activity predicted performance on the first task and the conditioned stimulus induced a theta-band response early in learning the first task. As expected, performance on the first task correlated with performance on the second task. However, theta activity did not increase during training on the second task, even though more cells were present in animals that had learned. Therefore, as long as learning occurs, relatively small changes in the environment are sufficient to increase the number of surviving neurons in the adult hippocampus and they can do so in the absence of an increase in theta activity. In conclusion, these data argue against an upper limit on the number of neurons that can be rescued from death by learning.

  16. Embryonic development of the sensory innervation of the antenna of the grasshopper Schistocerca gregaria.

    Science.gov (United States)

    Boyan, G S; Williams, J L D

    2004-10-01

    The establishment of the sensory nervous system of the antenna of the grasshopper Schistocerca gregaria was examined using immunocytochemical methods and in the light of the appendicular and articulated nature of this structure. The former is demonstrated first by the expression pattern of the segment polarity gene engrailed in the head neuromere innervating the antenna, the deutocerebrum. Engrailed expression is present in identified deutocerebral neuroblasts and, as elsewhere in the body, is continuous with cells of the posterior epithelium of the associated appendage, in this case the antenna. Second, early expression of the glial homeobox gene reversed polarity (repo) in the antenna is by a stereotypic pair of cells at the antenna base, a pattern we show is repeated metamerically for each thoracic appendage of the embryo. Subsequently, three regions of Repo expression (A1, A2, A3) are seen within the antenna, and may represent a preliminary form of articulation. Bromodeoxyuridine incorporation reveals that these regions are sites of intense cell differentiation. Neuron-specific horseradish peroxidase and Lazarillo expression confirm that the pioneers of the ventral and dorsal tracts of the antennal sensory nervous system are amongst these differentiating cells. Sets of pioneers appear simultaneously in several bands and project confluent axons towards the antennal base. We conclude that the sensory nervous system of the antenna is not pioneered from the tip of the antenna alone, but in a stepwise manner by cells from several zones. The early sensory nervous systems of antenna, maxilla and leg therefore follow a similar developmental program consistent with their serially homologous nature.

  17. Lazarillo expression reveals a subset of neurons contributing to the primary axon scaffold of the embryonic brain of the grasshopper Schistocerca gregaria.

    Science.gov (United States)

    Graf, S; Ludwig, P; Boyan, G

    2000-04-10

    The authors studied the contribution of seven clusters of Lazarillo-expressing cells to the primary axon scaffold of the brain in the grasshopper Schistocerca gregaria from 26% to 43% of embryogenesis. Each cluster, which was numbered according to when Lazarillo expression first appeared, was uniquely identifiable on the basis of its stereotypic position in the brain and the number of Lazarillo-expressing cells it contained. At no time during embryogenesis was Lazarillo expression found in brain neuroblasts: It was found only in progeny. For ease of analysis, axogenesis was followed in a cell cluster that contained only a single Lazarillo-expressing cell (the lateral cell) in the dorsal median domain of the brain midline. Bromodeoxyuridine incorporation revealed the presence of only a single midline precursor cell in this region during embryogenesis. Intracellular injection of Lucifer yellow into the lateral cell at various ages showed that there was no dye coupling to the midline precursor or to the nearby term-1-expressing primary commissure pioneers. The lateral cell is not related lineally to these cells and most likely differentiates directly from the neuroectoderm of the brain midline. Lazarillo expression appears at the onset of axogenesis as the lateral cell projects an axon laterally toward the next Lazarillo-expressing cell cluster. The cells of this target cluster direct axons into separate brain regions, thereby establishing an orthogonally organized scaffold that the lateral cell axon follows as it navigates away from the brain midline. The primary axon scaffold of the brain results from a stepwise interlinking of discrete brain regions, as exemplified by axons from neighboring Lazarillo-expressing cell clusters.

  18. Interleukin-1 receptor antagonist modulates the early phase of liver regeneration after partial hepatectomy in mice.

    Directory of Open Access Journals (Sweden)

    Antonino Sgroi

    Full Text Available BACKGROUND: Cytokine administration is a potential therapy for acute liver failure by reducing inflammatory responses and favour hepatocyte regeneration. The aim of this study was to evaluate the role of interleukin-1 receptor antagonist (IL-1ra during liver regeneration and to study the effect of a recombinant human IL-1ra on liver regeneration. METHODS: We performed 70%-hepatectomy in wild type (WT mice, IL-1ra knock-out (KO mice and in WT mice treated by anakinra. We analyzed liver regeneration at regular intervals by measuring the blood levels of cytokines, the hepatocyte proliferation by bromodeoxyuridin (BrdU incorporation, proliferating cell nuclear antigen (PCNA and Cyclin D1 expression. The effect of anakinra on hepatocyte proliferation was also tested in vitro using human hepatocytes. RESULTS: At 24h and at 48 h after hepatectomy, IL-1ra KO mice had significantly higher levels of pro-inflammatory cytokines (IL-6, IL-1β and MCP-1 and a reduced and delayed hepatocyte proliferation measured by BrdU incorporation, PCNA and Cyclin D1 protein levels, when compared to WT mice. IGFBP-1 and C/EBPβ expression was significantly decreased in IL-1ra KO compared to WT mice. WT mice treated with anakinra showed significantly decreased levels of IL-6 and significantly higher hepatocyte proliferation at 24h compared to untreated WT mice. In vitro, primary human hepatocytes treated with anakinra showed significantly higher proliferation at 24h compared to hepatocytes without treatment. CONCLUSION: IL1ra modulates the early phase of liver regeneration by decreasing the inflammatory stress and accelerating the entry of hepatocytes in proliferation. IL1ra might be a therapeutic target to improve hepatocyte proliferation.

  19. Immunolocalization indicates that both original and regenerated lizard tail tissues contain populations of long retaining cells, putative stem/progenitor cells.

    Science.gov (United States)

    Alibardi, Lorenzo

    2015-11-01

    The regeneration of the tail in lizards is likely sustained by stem/progenitor cells located in the stump after amputation of the tail. This microscopic and ultrastructural study shows the localization of 5-bromo-deoxy-uridine (5BrdU)-long retaining labeled cells in different tissues of the tail stump. These putative stem/progenitor cells are sparsely detected in the epidermis of scales, adipose tissue, intermuscle connective septa, myosatellite cells, and perichondrion of the vertebrae. Most of 5BrdU-labeled cells are present in the bone marrow of vertebrae as hemocytoblasts and reticulate cells, whereas more numerous myelocytes and polychromatophilic erythroblasts show a variable level of nuclear labeling. 5BrdU and tritiated-thymidine labeled and unlabeled hemopoietic cells are seen in circulating vessels and in the blastema where their maturation is completed. This observation indicates that the entire differentiation span of both white and red blood cells, at least during tail regeneration, lasts longer than 4 weeks. Labeled polychromatophilic erythroblasts and heterophilic and basophilic myelocytes are present in the synusoidal vessels of the regenerating tail. This study indicates that extravasating blood cells involved in immunity make large part of the forming blastema cell population, but are replaced by mesenchymal cells of different origin. The presence of long retaining labeled cells in tissues of the tail stump is likely connected to the production of blastema mesenchymal cells. Although no direct cell-lineage study has been done, histological, immunocytochemical, and autoradiographic studies have indicated that it is from these tissues that proliferating cells appear mainly localized after tail amputation and blastema formation.

  20. Identification of resting cells by dual-parameter flow cytometry of statin expression and DNA content

    Energy Technology Data Exchange (ETDEWEB)

    Pellicciari, C.; Mangiarotti, R.; Bottone, M.G.; Danova, M. [Univ. of Pavia (Italy); Wang, E. [Jewish General Hospital, Montreal, Quebec (Canada)

    1995-12-01

    Statin, a 57-kDa nuclear protein, has been recognized as a unique marker of quiescent (G{sub 0}) cells; specific monoclonal antibodies (MoAb) against statin have been produced and used to label resting cells in tissue sections and in cultured cells. We present an improved method for the identification of G{sub 0} cells by dual-parameter flow cytometry of statin expression and DNA content. The appropriate technical conditions were set up by using resting and cycling human fibroblasts as a model cell system. Several fixatives proved to be suitable for the immunocytochemical detection of statin; among them, 70% ethanol was selected because this fixation procedure is suitable for DNA staining with intercalating dyes and is routinely used for the immunolabeling of proliferation markers (such as proliferating cell nuclear antigen [PCNA] and Ki-67) and of bromodeoxyuridine (BrdUrd) incorporation. Following cell permeabilization with detergent, exposure to the antistatin antibody (S-44), and indirect fluorescein isothiocyanate immunolabeling, cells were counterstained for DNA with propidium iodide and analyzed by dual-parameter flow cytometry. In cells from several animal sources (rat thymocytes and C6 glioma cells, mouse 3T3 cells, and human MCF-7 cells), under different experimental conditions, the expression of statin was found to correlate inversely with that of PCNA and Ki-67, and with the BrdUrd labeling index. In dual-parameter flow scattergrams, G{sub 0} (statin positive) cells can be discriminated from the potentially cycling (statin negative) G{sub 1} cells, i.e., within a cell fraction having the same DNA content. This approach can be envisaged as a powerful tool both for monitoring changes in the resting cell fraction and for investigating the process of G{sub 0}-G{sub 1} transition in unperturbed and drug-treated cell populations. 48 refs., 5 figs., 1 tab.

  1. Ontogenesis of NADPH-diaphorase positive neurons in guinea pig neocortex

    Directory of Open Access Journals (Sweden)

    Chao eLiu

    2015-02-01

    Full Text Available In mammalian cerebrum there exist two distinct types of interneurons expressing nitric oxide synthase (NOS. Type I neurons are large in size and exhibit heavy nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-d histochemical reaction, while type II cells are small with light NADPH-d reactivity. The time of origin of these cortical neurons relative to corticogenesis remains largely unclear among mammals. Here we explored this issue in guinea pigs using cell birth-dating and double-labeling methods. Bromodeoxyuridine (BrdU pulse-chasing (2 doses at 50 mg/kg, 12 hours apart was given to time-pregnant mothers, followed by quantification of NADPH-d/BrdU colocalization in the parietal and temporal neocortex in offspring at postnatal day 0 (P0, P30 and P60. Type I neurons were partially colabeled with BrdU at P0, P30 and P60 following pulse-chasing at embryonic day 21 (E21, E28 and E35, varied from 2% to 11.3% of total population of these neurons for the three time groups. Type II neurons were partially colabeled for BrdU following pulse-chasing at E21, E28, E35 and E42 at P0 (8.6%-16.5% of total population for individual time groups. At P60, type II neurons were found to co-express BrdU (4.8%-11.3% of total population for individual time groups following pulse-chasing at E21, E28, E35, E42, E49, E56 and E60/61. These results indicate that in guinea pigs type I neurons are generated during early corticogenesis, whereas type II cells are produced over a wide prenatal time window persisting until birth. The data also suggest that type II nitrinergic neurons may undergo a period of development/differentiation, for over one month, before being NADPH-d reactive.

  2. Repression of cancer cell senescence by PKCι.

    Science.gov (United States)

    Paget, J A; Restall, I J; Daneshmand, M; Mersereau, J A; Simard, M A; Parolin, D A E; Lavictoire, S J; Amin, M S; Islam, S; Lorimer, I A J

    2012-08-02

    Senescence is an irreversible growth arrest phenotype adopted by cells that has a key role in protecting organisms from cancer. There is now considerable interest in therapeutic strategies that reactivate this process to control the growth of cancer cells. Protein kinase-Cι (PKCι) is a member of the atypical PKC family and an important downstream mediator in the phosphoinositide-3-kinase (PI-3-kinase) pathway. PKCι expression was found to be upregulated in a subset of breast cancers and breast cancer cell lines. Activation of the PI-3-kinase pathway by introduction of mutant, oncogenic PIK3CA into breast mammary epithelial cells increased both the expression and activation of PKCι. In breast cancer cells lines overexpressing PKCι, depletion of PKCι increased the number of senescent cells, as assessed by senescence-associated β-galactosidase, morphology and bromodeoxyuridine incorporation. This phenomenon was not restricted to breast cancer cells, as it was also seen in glioblastoma cells in which PKCι is activated by loss of PTEN. Senescence occurred in the absence of a detectable DNA-damage response, was dependent on p21 and was enhanced by the aurora kinase inhibitor VX-680, suggesting that senescence is triggered by defects in mitosis. Depletion of PKCι had no effect on senescence in normal mammary epithelial cell lines. We conclude that PKCι is overexpressed in a subset of cancers where it functions to suppress premature senescence. This function appears to be restricted to cancer cells and inhibition of PKCι may therefore be an effective way to selectively activate premature senescence in cancer cells.

  3. Cell proliferation of esophageal squamous epithelium in erosive and non-erosive reflux disease

    Institute of Scientific and Technical Information of China (English)

    Carlo Calabrese; Davide Trerè; Lorenzo Montanaro; Giuseppina Liguori; Elisa Brighenti; Mauela Vici; Paolo Gionchetti; Fernando Rizzello; Massimo Campieri; Massimo Derenzini

    2011-01-01

    AIM: To elucidate cell proliferation in erosive reflux disease (ERD) and non-erosive reflux disease (NERD), we evaluated markers in squamous epithelial cells. METHODS: Thirty-four consecutive patients with gastroesophageal- reflux-disease-related symptoms (21 NERD and 13 ERD) were evaluated for the enrolment into the study. All patients underwent 24-h pH monitoring, standard endoscopy, and biopsy for histological evaluation. The expression of cyclins D and A was evaluated by real-time reverse transcription polymerase chain reaction (RT-PCR) from isolated epithelial cells. In all samples, analysis of the isolated cell population revealed the presence of epithelial cells only. RESULTS: Real-time RT-PCR showed that, in patients with ERD, the relative expression of cyclin D1 mRNA in esophageal epithelium was strongly decreased in comparison with NERD patients. The mean value of relative expression of cyclin D1 mRNA in NERD patients was 3.44 ± 1.9, whereas in ERD patients, it was 1.32 ± 0.87 (P = 0.011). Real-time RT-PCR showed that, in patients with ERD, relative expression of cyclin A mRNA in esophageal epithelium was decreased in comparison with that in NERD patients (2.31 ± 2.87 vs 0.66 ± 1.11). The mean bromodeoxyuridine labeling index in the NERD patients was 5.42% ± 1.68%, whereas in ERD patients, it was 4.3% ± 1.59%. CONCLUSION: We confirmed reduced epithelial proliferation in ERD compared with NERD patients, and that individuals who develop ERD are characterized by weaker epithelial cell proliferation.

  4. Hepatocellular proliferation in response to agonists of peroxisome proliferator-activated receptor alpha: a role for kupffer cells?

    Directory of Open Access Journals (Sweden)

    Alsarra Ibrahim A

    2006-11-01

    Full Text Available Abstract Background It has been proposed that PPARα agonists stimulate Kupffer cells in rodents which in turn, release mitogenic factors leading to hepatic hyperplasia, and eventually cancer. However, Kupffer cells do not express PPARα receptors, and PPARα agonists stimulate hepatocellular proliferation in both TNFα- and TNFα receptor-null mice, casting doubt on the involvement of Kupffer cells in the mitogenic response to PPARα agonists. This study was therefore designed to investigate whether the PPARα agonist PFOA and the Kupffer cell inhibitor methylpalmitate produce opposing effects on hepatocellular proliferation and Kupffer cell activity in vivo, in a manner that would implicate these cells in the mitogenic effects of PPARα agonists. Methods Male Sprague-Dawley rats were treated intravenously via the tail vein with methylpalmitate 24 hrs prior to perfluorooctanoic acid (PFOA, and were sacrificed 24 hrs later, one hr after an intraperitoneal injection of bromodeoxyuridine (BrdU. Sera were analyzed for TNFα and IL-1β. Liver sections were stained immunohistochemically and quantified for BrdU incorporated into DNA. Results Data show that PFOA remarkably stimulated hepatocellular proliferation in the absence of significant changes in the serum levels of either TNFα or IL-1β. In addition, methylpalmitate did not alter the levels of these mitogens in PFOA-treated animals, despite the fact that it significantly blocked the hepatocellular proliferative effect of PFOA. Correlation between hepatocellular proliferation and serum levels of TNFα or IL-1β was extremely poor. Conclusion It is unlikely that mechanisms involving Kupffer cells play an eminent role in the hepatic hyperplasia, and consequently hepatocarcinogenicity attributed to PPARα agonists. This conclusion is based on the above mentioned published data and the current findings showing animals treated with PFOA alone or in combination with methylpalmitate to have similar

  5. Hypoxia reoxygenation induces premature senescence in neonatal SD rat cardiomyocytes

    Institute of Scientific and Technical Information of China (English)

    Feng-xiang ZHANG; Ming-long CHEN; Qi-jun SHAN; Jian-gang ZOU; Chun CHEN; Bing YANG; Dong-jie XU; Yu JIN; Ke-jiang CAO

    2007-01-01

    Aim: To investigate whether hypoxia reoxygenation induces premature senes-cence in neonatal Sprague-Dawley (SD) rat cardiomyocytes. Methods: Cardio-myocytes were isolated from neonatal SD rat heart and identified by immunohisto-chemistry. The control cultures were incubated at 37 ℃ in a humidified atmo-sphere of 5% CO and 95% air. The hypoxic cultures were incubated in a modular incubator chamber filled with 1% O2, 5% CO2, and balance N2 for 6 h. The reoxygen-ated cultures were subjected to 1% O2 and 5% CO2 for 6 h, then 21% oxygen for 4,8, 12, 24, and 48 h, respectively. Cell proliferation was determined using bromo-deoxyuridine labeling. The ultrastructure of cardiomyocytes was observed by using an electron microscope. Β-Galactosidase activity was determined by using a senescence β-galactosidase Staining Kit. P16INK4a and telomerase reverse tran-scriptase (TERT) mRNA levels were measured by real time quantitative PCR. TERT protein expression was determined by immunohistochemistry. Telomerase activi-ties were assayed by using the Telo TAGGG Telomerase PCR ELISApplus kit. Results:The initial cultures consisted of pure cardiomyocytes identified by immunohisto-chemistry. The proportion of BrdU positive cells was reduced significantly in the hypoxia reoxygenation-treated group (P<0.01). Under the condition of hypoxia reoxygenation, mitochondrial dehydration appeared; p16'INK4a and TERT mRNA levels, β-galactosidase activity, TERT protein expression and telomerase activi-ties were all significantly increased (P<0.01 or P<0.05). Conclusion: These data indicate that premature senescence could be induced in neonatal SD rat cardiomyo-cytes exposed to hypoxia reoxygenation. Although TERT significantly increased,it could not block senescence.

  6. Prenatal carbofuran exposure inhibits hippocampal neurogenesis and causes learning and memory deficits in offspring.

    Science.gov (United States)

    Mishra, Divya; Tiwari, Shashi Kant; Agarwal, Swati; Sharma, Vinod Praveen; Chaturvedi, Rajnish Kumar

    2012-05-01

    Neurogenesis is a process of generation of new neurons in the hippocampus and associated with learning and memory. Carbofuran, a carbamate pesticide, elicits several neurochemical, neurophysiological, and neurobehavioral deficits. We evaluated whether chronic prenatal oral exposure of carbofuran during gestational days 7-21 alters postnatal hippocampal neurogenesis at postnatal day 21. We found carbofuran treatment significantly decreased bromodeoxyuridine (BrdU) positive cell proliferation and long-term survival in the hippocampus only but not in the cerebellum. We observed a reduced number of transcription factor SOX-2 and glial fibrillary acidic protein (GFAP) colabeled cells, decreased nestin messenger RNA (mRNA) expression, and decreased histone-H3 phosphorylation following carbofuran treatment, suggesting a decreased pool of neural progenitor cells (NPC). Colocalization of BrdU with doublecortin (DCX), neuronal nuclei (NeuN), and GFAP suggested decreased neuronal differentiation and increased glial differentiation by carbofuran. The number of DCX(+) and NeuN(+) neurons, NeuN protein levels, and fibers length of DCX(+) neurons were decreased by carbofuran. Carbofuran caused a significant downregulation of mRNA expression of the neurogenic genes/transcription factors such as neuregulin, neurogenin, and neuroD1 and upregulation of the gliogenic gene Stat3. Carbofuran exposure led to increased BrdU/caspase 3 colabeled cells, an increased number of degenerative neurons and profound deficits in learning and memory processes. The number and size of primary neurospheres derived from the hippocampus of carbofuran-treated rats were decreased. These results suggest that early gestational carbofuran exposure diminishes neurogenesis, reduces the NPC pool, produces neurodegeneration in the hippocampus, and causes cognitive impairments in rat offspring.

  7. Chronic hypoxia induces the activation of the Wnt/β-catenin signaling pathway and stimulates hippocampal neurogenesis in wild-type and APPswe-PS1ΔE9 transgenic mice in vivo

    Science.gov (United States)

    Varela-Nallar, Lorena; Rojas-Abalos, Macarena; Abbott, Ana C.; Moya, Esteban A.; Iturriaga, Rodrigo; Inestrosa, Nibaldo C.

    2014-01-01

    Hypoxia modulates proliferation and differentiation of cultured embryonic and adult stem cells, an effect that includes β-catenin, a key component of the canonical Wnt signaling pathway. Here we studied the effect of mild hypoxia on the activity of the Wnt/β-catenin signaling pathway in the hippocampus of adult mice in vivo. The hypoxia-inducible transcription factor-1α (HIF-1α) was analyzed as a molecular control of the physiological hypoxic response. Exposure to chronic hypoxia (10% oxygen for 6–72 h) stimulated the activation of the Wnt/β-catenin signaling pathway. Because the Wnt/β-catenin pathway is a positive modulator of adult neurogenesis, we evaluated whether chronic hypoxia was able to stimulate neurogenesis in the subgranular zone (SGZ) of the hippocampal dentate gyrus. Results indicate that hypoxia increased cell proliferation and neurogenesis in adult wild-type mice as determined by Ki67 staining, Bromodeoxyuridine (BrdU) incorporation and double labeling with doublecortin (DCX). Chronic hypoxia also induced neurogenesis in a double transgenic APPswe-PS1ΔE9 mouse model of Alzheimer’s disease (AD), which shows decreased levels of neurogenesis in the SGZ. Our results show for the first time that exposure to hypoxia in vivo can induce the activation of the Wnt/β-catenin signaling cascade in the hippocampus, suggesting that mild hypoxia may have a therapeutic value in neurodegenerative disorders associated with altered Wnt signaling in the brain and also in pathological conditions in which hippocampal neurogenesis is impaired. PMID:24574965

  8. Research Resource: The Dexamethasone Transcriptome in Hypothalamic Embryonic Neural Stem Cells.

    Science.gov (United States)

    Frahm, Krystle A; Peffer, Melanie E; Zhang, Janie Y; Luthra, Soumya; Chakka, Anish B; Couger, Matthew B; Chandran, Uma R; Monaghan, A Paula; DeFranco, Donald B

    2016-01-01

    Exposure to excess glucocorticoids during fetal development has long-lasting physiological and behavioral consequences, although the mechanisms are poorly understood. The impact of prenatal glucocorticoids exposure on stress responses in juvenile and adult offspring implicates the developing hypothalamus as a target of adverse prenatal glucocorticoid action. Therefore, primary cultures of hypothalamic neural-progenitor/stem cells (NPSCs) derived from mouse embryos (embryonic day 14.5) were used to identify the glucocorticoid transcriptome in both males and females. NPSCs were treated with vehicle or the synthetic glucocorticoid dexamethasone (dex; 100nM) for 4 hours and total RNA analyzed using RNA-Sequencing. Bioinformatic analysis demonstrated that primary hypothalamic NPSC cultures expressed relatively high levels of a number of genes regulating stem cell proliferation and hypothalamic progenitor function. Interesting, although these cells express glucocorticoid receptors (GRs), only low levels of sex-steroid receptors are expressed, which suggested that sex-specific differentially regulated genes identified are mediated by genetic and not hormonal influences. We also identified known or novel GR-target coding and noncoding genes that are either regulated equivalently in male and female NPSCs or differential responsiveness in one sex. Using gene ontology analysis, the top functional network identified was cell proliferation and using bromodeoxyuridine (BrdU) incorporation observed a reduction in proliferation of hypothalamic NPSCs after dexamethasone treatment. Our studies provide the first characterization and description of glucocorticoid-regulated pathways in male and female embryonically derived hypothalamic NPSCs and identified GR-target genes during hypothalamic development. These findings may provide insight into potential mechanisms responsible for the long-term consequences of fetal glucocorticoid exposure in adulthood.

  9. Bone marrow stromal cells can promote the neurogenesis in subventricular zone in the rat with focal cerebral ischemia

    Directory of Open Access Journals (Sweden)

    Pushuai Wen

    2010-01-01

    Full Text Available   Abstract Introdution: Stroke is one of the most common diseases caused by occlusion or rupture of blood vessels in brain. It brings heavily loads for families and societies. Although some new strategies including treatment of tissue plasminogen activator have been applied in the clinic, these methods do not have perfect effect. Accordingly, more effective therapeutic strategies need to be developed. This study was conducted to investigate the action of bone marrow stromal cells (BMSC on the neural stem cells in the subventricular zone of the rat after focal cerebral ischemia. Methods: The rats were induced to permanent focal cerebral ischemia models with middle cerebral artery occlusion (MCA0. Test groups consisted of three groups: MCAO alone, intravenous infusion of 1 ml PBS at 24 hours after MCAO, and intravenous infusion of 2×106 BMSCs 24 hours after MCAO. Then, the groups were divided to investigate at 7 and 14 days after MACO. Neurological functions were detected to use Zausinger evaluation; meanwhile, 5-bromodeoxyuridine was injected to label the proliferating cells in the subventricular zone, and double-immunofluoroscent technologies were used to identify the cell type.  Results: Neurological functional scores of BMSCs-treated group were higher than other two groups (p<0.05 at 7 and 14 days after MACO. BrdU-positive cells in SVZ of ipsilateral ischemia of BMSCs-treated group were more than two controls (p<0.05 at 14 days after MCAO; double-immunofluorescence label demonstrated that BrdU-positive cells co-located with markers of neuron and astrocyte.   Discussion: BMSCs can promote the neurological function of the rats with permanent focal cerebral ischemia, which may associate with the neurogenesis in the subventricular zone.

  10. Reversal of new-onset diabetes through modulating inflammation and stimulating beta-cell replication in nonobese diabetic mice by a dipeptidyl peptidase IV inhibitor.

    Science.gov (United States)

    Tian, Lei; Gao, Jie; Hao, Jianqiang; Zhang, Yu; Yi, Huimin; O'Brien, Timothy D; Sorenson, Robert; Luo, Jian; Guo, Zhiguang

    2010-07-01

    Inhibition of dipeptidyl peptidase IV (DPP-IV) activity by NVP-DPP728, a DPP-IV inhibitor, improves the therapeutic efficacy of glucagon-like peptide-1 (GLP-1). CD26 is a membrane-associated glycoprotein with DPP-IV activity and is expressed on lymphocytes. We investigated the effect of NVP-DPP728 on reversing new-onset diabetes in nonobese diabetic (NOD) mice and modulating the inflammatory response and stimulating beta-cell regeneration. New-onset diabetic NOD mice were treated with NVP-DPP728 for 2, 4, and 6 wk. Blood glucose level was monitored. Regulatory T cells in thymus and secondary lymph nodes, TGF-beta1 and GLP-1 in plasma, and the insulin content in the pancreas were measured. Immunostaining for insulin and bromodeoxyuridine (BrdU) were performed. The correlation of beta-cell replication with inflammation was determined. In NVP-DPP728-treated NOD mice, diabetes could be reversed in 57, 74, and 73% of mice after 2, 4, and 6 wk treatment, respectively. Insulitis was reduced and the percentage of CD4(+)CD25(+)FoxP3(+) regulatory T cells was increased in treated NOD mice with remission. Plasma TGF-beta1 and GLP-1, the insulin content, and both insulin(+) and BrdU(+) beta-cells in pancreas were also significantly increased. No significant correlations were found between numbers of both insulin(+) and BrdU(+) beta-cells in islets and beta-cell area or islets with different insulitis score in NOD mice with remission of diabetes. In conclusion, NVP-DPP728 treatment can reverse new-onset diabetes in NOD mice by reducing insulitis, increasing CD4(+)CD25(+)FoxP3(+) regulatory T cells, and stimulating beta-cell replication. beta-Cell replication is not associated with the degree of inflammation in NVP-DPP728-treated NOD mice.

  11. Involvement of DNA damage in hydroxyurea-mediated induction of endogenous murine retrovirus

    Energy Technology Data Exchange (ETDEWEB)

    Rascati, R.J.; Tennant, R.W.

    1979-04-30

    Hydroxyurea (HU) induces AKR cells to produce endogenous murine retrovirus at a low frequency (approx. 1 x 10/sup -5/), and DNA synthesis is required soon after treatment with HU for induction to be observed (i.e., no stable induction intermediate is formed). Induction by HU can be enhanced by simultaneous treatment with halogenated pyrimidines, with the concomitant appearance of a stable induction intermediate state. The effects of the two compounds are synergistic, indicating an actual stimulation of HU-mediated induction by iodode-oxyuridine. Since HU inhibits semiconservative replication, and since (/sup 3/H)bromodeoxyuridine is incorporated into the cellular genome predominantly by unscheduled DNA synthesis (repair replication) under these conditions, this stimulation appears to be the result of insertion into DNA of the thymidine analogs during the repair of HU-induced alterations in the DNA. The nature of HU damage to DNA is not defined; if single-strand breaks are involved, they may occur at a frequency <10/sup -8/ and escape detection, but induction could also be due to other alterations in DNA. The characteristics of induction by HU, therefore, are similar to those of induction by other DNA-damaging treatments such as ..gamma.. or x irradiation or methylcholanthrene. This suggests that these agents may induce by similar, if not identical, mechanisms. Further, the ability of halogenated pyrimidines to form a stable induction intermediate when incorporated by repair synthesis, similar to the intermediate formed when the analogs are incorporated during semiconservative replication, suggests that the same sites are involved for induction by damaging agents or by halogenated pyrimidine incorporation.

  12. Is silence golden? Effects of auditory stimuli and their absence on adult hippocampal neurogenesis.

    Science.gov (United States)

    Kirste, Imke; Nicola, Zeina; Kronenberg, Golo; Walker, Tara L; Liu, Robert C; Kempermann, Gerd

    2015-03-01

    We have previously hypothesized that the reason why physical activity increases precursor cell proliferation in adult neurogenesis is that movement serves as non-specific signal to evoke the alertness required to meet cognitive demands. Thereby a pool of immature neurons is generated that are potentially recruitable by subsequent cognitive stimuli. Along these lines, we here tested whether auditory stimuli might exert a similar non-specific effect on adult neurogenesis in mice. We used the standard noise level in the animal facility as baseline and compared this condition to white noise, pup calls, and silence. In addition, as patterned auditory stimulus without ethological relevance to mice we used piano music by Mozart (KV 448). All stimuli were transposed to the frequency range of C57BL/6 and hearing was objectified with acoustic evoked potentials. We found that except for white noise all stimuli, including silence, increased precursor cell proliferation (assessed 24 h after labeling with bromodeoxyuridine, BrdU). This could be explained by significant increases in BrdU-labeled Sox2-positive cells (type-1/2a). But after 7 days, only silence remained associated with increased numbers of BrdU-labeled cells. Compared to controls at this stage, exposure to silence had generated significantly increased numbers of BrdU/NeuN-labeled neurons. Our results indicate that the unnatural absence of auditory input as well as spectrotemporally rich albeit ethological irrelevant stimuli activate precursor cells-in the case of silence also leading to greater numbers of newborn immature neurons-whereas ambient and unstructured background auditory stimuli do not.

  13. NF-KB downregulation may be involved the depression of tumor cell proliferation mediated by human mesenchymal stem cells

    Institute of Scientific and Technical Information of China (English)

    Ling QIAO; Tie-jun ZHAO; Feng-ze WANG; Chang-liang SHAN; Li-hong YE; Xiao-dong ZHANG

    2008-01-01

    Aim:It has been reported that stem cells are able to home to tumorigenesis and inhibit the proliferation of tumor cells.The purpose of our study was to demon-strate the molecular mechanism of the inhibitory proliferation of hepatoma cells and breast cancer cells mediated by human mesenchymal stem cells (hMSCs).Methods:The proliferation of H7402 human hepatoma cells and MCF-7 human breast cancer cells was measured by the 5-bromodeoxyuridine (BrdU) incorpora-tion assay and flow cytometry assay after the treatment with conditioned media from hMSCs culture,such as Z3 cells or BMMS-03 cells.The role of NF-kB or the phosphorylation of inhibitor kBoα (p-IkBα) in the depression of hepatoma or breast cancer cells treated with conditioned media from Z3 cells or BMMS-03 cells was examined by reporter gene assay,quantitative real-time PCR,and Western blot analysis,respectively.Results:The proliferation of H7402 cells and MCF-7 cells was decreased significantly by the BrdU incorporation assay and flow cytometry assay after treatment.The transcriptional activity and mRNA level of NF-kB were downregulated in the treated cells by reporter gene assay and quantitative real-time PCR in a dose-dependent manner.At the protein level,NF-kB and p-IkBα decreased in the treated cells by Western blot analysis.Conclusion:Conditioned media from hMSCs are able to inhibit the proliferation of tumor cells.NF-kB downregulation is one of reasons for the depression of tumor cell proliferation mediated by hMSCs.

  14. Stimulation of colonic mucosal growth associated with oxidized redox status in rats.

    Science.gov (United States)

    Tian, Junqiang; Washizawa, Naohiro; Gu, Li H; Levin, Marc S; Wang, Lihua; Rubin, Deborah C; Mwangi, Simon; Srinivasan, Shanthi; Gao, Yuhao; Jones, Dean P; Ziegler, Thomas R

    2007-03-01

    Limited data in animal models suggest that colonic mucosa undergoes adaptive growth following massive small bowel resection (SBR). In vitro data suggest that intestinal cell growth is regulated by reactive oxygen species and redox couples [e.g., glutathione (GSH)/glutathione disulfide (GSSG) and cysteine (Cys)/cystine (CySS) redox]. We investigated the effects of SBR and alterations in redox on colonic growth indexes in rats after either small bowel transection (TX) or 80% midjejunoileal resection (RX). Rats were pair fed +/- blockade of endogenous GSH synthesis with buthionine sulfoximine (BSO). Indexes of colonic growth, proliferation, and apoptosis and GSH/GSSG and Cys/CySS redox potentials (E(h)) were determined. RX significantly increased colonic crypt depth, number of cells per crypt, and epithelial cell proliferation [crypt cell bromodeoxyuridine (BrdU) incorporation]. Administration of BSO markedly decreased colonic mucosal GSH, GSSG, and Cys concentrations in both TX and RX groups, with a resultant oxidation of GSH/GSSG and Cys/CySS E(h). BSO did not alter colonic crypt cell apoptosis but significantly increased all colonic mucosal growth indexes (crypt depth, cells/crypt, and BrdU incorporation) in both TX and RX groups in a time- and dose-dependent manner. BSO significantly decreased plasma GSH and GSSG, oxidized GSH/GSSG E(h), and increased plasma Cys and CySS concentrations. Collectively, these data provide in vivo evidence indicating that oxidized colonic mucosal redox status stimulates colonic mucosal growth in rats. The data also suggest that GSH is required to maintain normal colonic and plasma Cys/CySS homeostasis in these animal models.

  15. Local glutathione redox status does not regulate ileal mucosal growth after massive small bowel resection in rats.

    Science.gov (United States)

    Tian, Junqiang; Washizawa, Naohiro; Gu, Li H; Levin, Marc S; Wang, Lihua; Rubin, Deborah C; Mwangi, Simon; Srinivasan, Shanthi; Jones, Dean P; Ziegler, Thomas R

    2007-02-01

    Glutathione (GSH) concentration affects cell proliferation and apoptosis in intestinal and other cell lines in vitro. However, in vivo data on gut mucosal GSH redox status and cell turnover are limited. We investigated the effect of altered GSH redox status on the ileal mucosa in a rat model of short bowel syndrome following massive small bowel resection (SBR). Rats underwent 80% mid-jejunoileal resection (RX) or small bowel transection (TX; as operative controls), with administration of either saline or D, L-buthionine-sulfoximine (BSO), a specific inhibitor of cellular GSH synthesis. Ileal mucosal redox, morphology, and indices of cell proliferation and apoptosis were determined at different days after surgery. Ileal GSH redox status was assessed by GSH and GSH disulfide (GSSG) concentrations and the redox potential of GSH/GSSG (Eh). Ileal lipid peroxidation [free malondialdehyde (MDA)] was measured as an index of lipid peroxidation. BSO markedly decreased ileal mucosal GSH, oxidized GSH/GSSG Eh, and increased MDA content without inducing morphological damage as assessed by light or electron microscopy. As expected, SBR stimulated adaptive growth of ileal villus height and total mucosal height at 7 d after surgery, but this response was unaffected by BSO treatment despite a modest increase in crypt cell apoptosis. Ileal cell proliferation (crypt cell bromodeoxyuridine incorporation) increased at 2 d after SBR but was unaffected by BSO. Collectively, our in vivo data show that marked depletion of ileal GSH and oxidation of the GSH redox pool does not alter indices of ileal epithelial proliferation or SBR-induced ileal mucosal adaptive growth.

  16. Vasopressin V1A receptor mediates cell proliferation through GRK2-EGFR-ERK1/2 pathway in A7r5 cells.

    Science.gov (United States)

    Zhang, Lingling; Wang, Xiaojun; Cao, Hong; Chen, Yunxuan; Chen, Xianfan; Zhao, Xi; Xu, Feifei; Wang, Yifan; Woo, Anthony Yiu-Ho; Zhu, Weizhong

    2016-12-05

    Abnormal proliferation and hypertrophy of vascular smooth muscle (VSMC), as the main structural component of the vasculature, is an important pathological mechanism of hypertension. Recently, increased levels of arginine vasopressin (AVP) and copeptin, the C-terminal fragment of provasopressin, have been shown to correlate with the development of preeclampsia. AVP targets on the Gq-coupled vasopressin V1A receptor and the Gs-coupled V2 receptor in VSMC and the kidneys to regulate vascular tone and water homeostasis. However, the role of the vasopressin receptor on VSM cell proliferation during vascular remodeling is unclear. Here, we studied the effects of AVP on the proliferation of the rat VSMC-derived A7r5 cells. AVP, in a time- and concentration-dependent manner, promoted A7r5 cell proliferation as indicated by the induction of proliferating cell nuclear antigen expression, methylthiazolyldiphenyl-tetrazolium reduction and incorporation of 5'-bromodeoxyuridine into cellular DNA. These effects, coupled with the phosphorylation of extracellular signal-regulated kinase 1/2 (ERK1/2), were blocked by a V1A receptor antagonist SR45059 but not by a V2 receptor antagonist lixivaptan. Although acute activation of V1A receptor induced ERK1/2 phosphorylation via a protein kinase C-dependent pathway, this effect was not involved in cell proliferation. Cell proliferation and ERK1/2 phosphorylation in response to prolonged stimulation with AVP were abolished by inhibition of G protein-coupled receptor kinase 2 (GRK2) and epidermal growth factor receptor (EGFR) using specific inhibitors or small hairpin RNA knock-down. These results suggest that activation of V1A, but not V2 receptor, produces a cell proliferative signal in A7r5 cells via a GRK2/EGFR/ERK1/2-dependent mechanism.

  17. Runx expression is mitogenic and mutually linked to Wnt activity in blastula-stage sea urchin embryos.

    Directory of Open Access Journals (Sweden)

    Anthony J Robertson

    Full Text Available BACKGROUND: The Runt homology domain (Runx defines a metazoan family of sequence-specific transcriptional regulatory proteins that are critical for animal development and causally associated with a variety of mammalian cancers. The sea urchin Runx gene SpRunt-1 is expressed throughout the blastula stage embryo, and is required globally during embryogenesis for cell survival and differentiation. METHODOLOGY/PRINCIPAL FINDINGS: Depletion of SpRunt-1 by morpholino antisense-mediated knockdown causes a blastula stage deficit in cell proliferation, as shown by bromodeoxyuridine (BrdU incorporation and direct cell counts. Reverse transcription coupled polymerase chain reaction (RT-PCR studies show that the cell proliferation deficit is presaged by a deficit in the expression of several zygotic wnt genes, including wnt8, a key regulator of endomesoderm development. In addition, SpRunt-1-depleted blastulae underexpress cyclinD, an effector of mitogenic Wnt signaling. Blastula stage cell proliferation is also impeded by knockdown of either wnt8 or cyclinD. Chromatin immunoprecipitation (ChIP indicates that Runx target sites within 5' sequences flanking cyclinD, wnt6 and wnt8 are directly bound by SpRunt-1 protein at late blastula stage. Furthermore, experiments using a green fluorescent protein (GFP reporter transgene show that the blastula-stage operation of a cis-regulatory module previously shown to be required for wnt8 expression (Minokawa et al., Dev. Biol. 288: 545-558, 2005 is dependent on its direct sequence-specific interaction with SpRunt-1. Finally, inhibitor studies and immunoblot analysis show that SpRunt-1 protein levels are negatively regulated by glycogen synthase kinase (GSK-3. CONCLUSIONS/SIGNIFICANCE: These results suggest that Runx expression and Wnt signaling are mutually linked in a feedback circuit that controls cell proliferation during development.

  18. Tart cherry juice induces differential dose-dependent effects on apoptosis, but not cellular proliferation, in MCF-7 human breast cancer cells.

    Science.gov (United States)

    Martin, Keith R; Wooden, Alissa

    2012-11-01

    Consumption of polyphenol-rich fruits, for example, tart cherries, is associated with a lower risk of cardiovascular disease and cancer. This is due, in large part, to the diverse myriad bioactive agents, that is, polyphenol anthocyanins, present in fruits. Anthocyanin-rich tart cherries purportedly modulate numerous cellular processes associated with oncogenesis such as apoptosis, cellular proliferation (CP), and cell cycle progression, although the effective concentrations eliciting these effects are unclear. We hypothesized that several dose-dependent effects over a large concentration range of 100% tart cherry juice (TCJ) would exist and affect these processes differentially with the potential for cellular protection and cellular death either by apoptosis or by necrosis. In this in vitro study, we tested the dose response of TCJ on CP and cell death in MCF-7 human breast cancer cells. TCJ was added at 0.03-30% (v/v) to cells and incubated overnight with the medium alone or with increasing TCJ. Bromodeoxyuridine incorporation was significantly reduced by 20% at ≥10% (v/v) TCJ and associated with necrosis, but was not different between the control and treatment groups at <10% TCJ. MTT reduction was also significantly reduced by 27% and 80% at 10% and 30% TCJ, respectively, and associated with necrosis. Apoptosis, but not necrosis, was increased ∼63% at 3% TCJ (∼307 nM monomeric anthocyanins), yet significantly decreased (P<.05) by 20% at 1% TCJ (920 nM) both of which were physiologically relevant concentrations of anthocyanins. The data support a biphasic effect on apoptosis and no effect on proliferation.

  19. Proinflammatory mediators stimulate neutrophil-directed angiogenesis.

    LENUS (Irish Health Repository)

    McCourt, M

    2012-02-03

    BACKGROUND: Vascular endothelial growth factor (VEGF; vascular permeability factor) is one of the most potent proangiogenic cytokines, and it plays a central role in mediating the process of angiogenesis or new blood vessel formation. Neutrophils (PMNs) recently have been shown to produce VEGF. HYPOTHESIS: The acute inflammatory response is a potent stimulus for PMN-directed angiogenesis. METHODS: Neutrophils were isolated from healthy volunteers and stimulated with lipopolysaccharide (LPS), tumor necrosis factor alpha (TNF-alpha), interleukin 6 (IL-6), and anti-human Fas monoclonal antibody. Culture supernatants were assayed for VEGF using enzyme-linked immunosorbent assays. Culture supernatants from LPS- and TNF-alpha-stimulated PMNs were then added to human umbilical vein endothelial cells and human microvessel endothelial cells and assessed for endothelial cell proliferation using 5-bromodeoxyuridine labeling. Tubule formation was also assessed on MATRIGEL basement membrane matrix. Neutrophils were lysed to measure total VEGF release, and VEGF expression was detected using Western blot analysis. RESULTS: Lipopolysaccharide and TNF-alpha stimulation resulted in significantly increased release of PMN VEGF (532+\\/-49 and 484+\\/-80 pg\\/mL, respectively; for all, presented as mean +\\/- SEM) compared with control experiments (32+\\/-4 pg\\/mL). Interleukin 6 and Fas had no effect. Culture supernatants from LPS- and TNF-alpha-stimulated PMNs also resulted in significant increases (P<.005) in macrovascular and microvascular endothelial cell proliferation and tubule formation. Adding anti-human VEGF-neutralizing polyclonal antibody to stimulated PMN supernatant inhibited these effects. Total VEGF release following cell lysis and Western blot analysis suggests that the VEGF is released from an intracellular store. CONCLUSION: Activated human PMNs are directly angiogenic by releasing VEGF, and this has important implications for inflammation, capillary leak syndrome

  20. Interleukin-1 regulates proliferation and differentiation of oligodendrocyte progenitor cells.

    Science.gov (United States)

    Vela, José M; Molina-Holgado, Eduardo; Arévalo-Martín, Angel; Almazán, Guillermina; Guaza, Carmen

    2002-07-01

    Interleukin-1 (IL-1) is a pleiotropic cytokine expressed during normal CNS development and in inflammatory demyelinating diseases, but remarkably little is known about its effect on oligodendroglial cells. In this study we explored the role of IL-1beta in oligodendrocyte progenitors and differentiated oligodendrocytes. The effects of IL-1beta were compared to those of IL-1 receptor antagonist, the specific inhibitor of IL-1 activity, since progenitors and differentiated oligodendrocytes produce IL-1beta and express IL-1 receptors. Unlike other proinflammatory cytokines (TNFalpha and IFNgamma), IL-1beta was not toxic for oligodendrocyte lineage cells. However, this cytokine inhibited proliferation of oligodendrocyte progenitors in the presence of growth factors (PDGF plus bFGF). This was evidenced by a significant decrease in both cells incorporating bromodeoxyuridine (45%) and total cell numbers (57%) after 6 days of treatment. Interestingly, IL-1beta blocked proliferation at the late progenitor/prooligodendrocyte (O4+) stage but did not affect proliferation of early progenitors (A2B5+). Inhibition of proliferation paralleled with promotion of differentiation, as revealed by the increased percentage of R-mab+ cells (6.7-fold). Moreover, when oligodendrocyte progenitors were allowed to differentiate in the absence of growth factors, treatment with IL-1beta promoted maturation to the MBP+ stage (4.2-fold) and survival of differentiating oligodendrocytes (2.1-fold). Regarding intracellular signaling, IL-1beta activated the p38 mitogen-activated protein kinase (MAPK) but not the p42/p44 MAPK and, when combined with growth factors, intensified p38 activation but inhibited the growth-factor-induced p42/p44 activation. IL-1beta also induced a time-dependent inhibition of PFGF-Ralpha gene expression. These results support a role for IL-1beta in promoting mitotic arrest and differentiation of oligodendrocyte progenitors as well as maturation and survival of differentiating

  1. Sex and strategy use matters for pattern separation, adult neurogenesis, and immediate early gene expression in the hippocampus.

    Science.gov (United States)

    Yagi, Shunya; Chow, Carmen; Lieblich, Stephanie E; Galea, Liisa A M

    2016-01-01

    Adult neurogenesis in the dentate gyrus (DG) plays a crucial role for pattern separation, and there are sex differences in the regulation of neurogenesis. Although sex differences, favoring males, in spatial navigation have been reported, it is not known whether there are sex differences in pattern separation. The current study was designed to determine whether there are sex differences in the ability for separating similar or distinct patterns, learning strategy choice, adult neurogenesis, and immediate early gene (IEG) expression in the DG in response to pattern separation training. Male and female Sprague-Dawley rats received a single injection of the DNA synthesis marker, bromodeoxyuridine (BrdU), and were tested for the ability of separating spatial patterns in a spatial pattern separation version of delayed nonmatching to place task using the eight-arm radial arm maze. Twenty-seven days following BrdU injection, rats received a probe trial to determine whether they were idiothetic or spatial strategy users. We found that male spatial strategy users outperformed female spatial strategy users only when separating similar, but not distinct, patterns. Furthermore, male spatial strategy users had greater neurogenesis in response to pattern separation training than all other groups. Interestingly, neurogenesis was positively correlated with performance on similar pattern trials during pattern separation in female spatial strategy users but negatively correlated with performance in male idiothetic strategy users. These results suggest that the survival of new neurons may play an important positive role for pattern separation of similar patterns in females. Furthermore, we found sex and strategy differences in IEG expression in the CA1 and CA3 regions in response to pattern separation. These findings emphasize the importance of studying biological sex on hippocampal function and neural plasticity.

  2. Evidence that tumor necrosis factor-related apoptosis inducing ligand (TRAIL) inhibits angiogenesis by inducing vascular endothelial cell apoptosis

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Pei-Lin, E-mail: pchen@dal.ca [Department of Pathology, Dalhousie University, Halifax, Nova Scotia (Canada); Easton, Alexander S., E-mail: alexander.easton@dal.ca [Department of Pathology, Dalhousie University, Halifax, Nova Scotia (Canada); Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia (Canada); Division of Neurosurgery, Department of Surgery, Dalhousie University, Halifax, Nova Scotia (Canada)

    2010-01-01

    Tumor necrosis factor (TNF) and its related ligands TNF-related apoptosis inducing ligand (TRAIL) and Fas ligand (FasL) play roles in the regulation of vascular responses, but their effect on the formation of new blood vessels (angiogenesis) is unclear. Therefore, we have examined the effects of these ligands on angiogenesis modeled with primary cultures of human umbilical vein endothelial cells (HUVEC). To examine angiogenesis in the context of the central nervous system, we have also modeled cerebral angiogenesis with the human brain endothelial cell line hCMEC/D3. Parameters studied were bromodeoxyuridine (BrdU) incorporation and cell number (MTT) assay (to assess endothelial proliferation), scratch assay (migration) and networks on Matrigel (tube formation). In our hands, neither TRAIL nor FasL (1, 10, and 100 ng/ml) had an effect on parameters of angiogenesis in the HUVEC model. In hCMEC/D3 cells by contrast, TRAIL inhibited all parameters (10-100 ng/ml, 24 h). This was due to apoptosis, since its action was blocked by the pan-caspase inhibitor zVADfmk (5 x 10{sup -5} mol/l) and TRAIL increased caspase-3 activity 1 h after application. However FasL (100 ng/ml) increased BrdU uptake without other effects. We conclude that TRAIL has different effects on in vitro angiogenesis depending on which model is used, but that FasL is generally ineffective when applied in vitro. The data suggest that TRAIL primarily influences angiogenesis by the induction of vascular endothelial apoptosis, leading to vessel regression.

  3. Dose response for TCDD promotion of hepatocarcinogenesis in rats initiated with DEN: histologic, biochemical, and cell proliferation endpoints.

    Science.gov (United States)

    Maronpot, R R; Foley, J F; Takahashi, K; Goldsworthy, T; Clark, G; Tritscher, A; Portier, C; Lucier, G

    1993-12-01

    The present study examines the dose-response relationship for 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) promotion of histologic and biochemical parameters by using a two-stage model for hepatocarcinogenesis in female Sprague-Dawley rats initiated with a single intraperitoneal dose of 175 mg of diethylnitrosamine (DEN)/kg body weight at 70 days of age. Starting 2 weeks after initiation, treatment groups of 8-10 rats were given TCDD by gavage in corn oil once every 2 weeks for 30 weeks. Doses were 3.5, 10.7, 35.7, and 125 ng TCDD/kg body weight/day. A significant body weight reduction was present in the noninitiated group that received 125 ng TCDD. Relative liver weight was statistically increased in initiated rats treated with > or = 10.7 ng TCDD and in noninitiated rats treated with > or = 35.7 ng TCDD. Histopathologic evidence of cytotoxicity was dose-related in all TCDD-treated groups. There was a statistically significant dose response in the bromodeoxyuridine (BrdU) S-phase labeling index (LI) in the DEN-initiated rats (p < 0.01) and a marginally significant trend in the saline-treated rats (p = 0.10), but proliferating cell nuclear antigen S-phase LI and growth fraction within altered hepatic foci showed no increase. Among the DEN-initiated groups there was a significant increase in glutathione S-transferase altered hepatic foci stereological parameters in the 125 ng TCDD group. This study demonstrates that dose-response relationships for TCDD's effects on cell proliferation growth of altered hepatic foci are different from previously reported effects on P450 gene expression, indicating that different biological or biochemical responses may exhibit different dose-response relationships.(ABSTRACT TRUNCATED AT 250 WORDS)

  4. 1-O-hexadecyloxypropyl cidofovir (CMX001) effectively inhibits polyomavirus BK replication in primary human renal tubular epithelial cells.

    Science.gov (United States)

    Rinaldo, Christine Hanssen; Gosert, Rainer; Bernhoff, Eva; Finstad, Solrun; Hirsch, Hans H

    2010-11-01

    Antiviral drugs for treating polyomavirus BK (BKV) replication in polyomavirus-associated nephropathy or hemorrhagic cystitis are of considerable clinical interest. Unlike cidofovir, the lipid conjugate 1-O-hexadecyloxypropyl cidofovir (CMX001) is orally available and has not caused detectable nephrotoxicity in rodent models or human studies to date. Primary human renal proximal tubular epithelial cells were infected with BKV-Dunlop, and CMX001 was added 2 h postinfection (hpi). The intracellular and extracellular BKV DNA load was determined by quantitative PCR. Viral gene expression was examined by quantitative reverse transcription-PCR, Western blotting, and immunofluorescence microscopy. We also examined host cell viability, proliferation, metabolic activity, and DNA replication. The titration of CMX001 identified 0.31 μM as the 90% effective concentration (EC(90)) for reducing the extracellular BKV load at 72 hpi. BKV large T antigen mRNA and protein expression was unaffected at 24 hpi, but the intracellular BKV genome was reduced by 90% at 48 hpi. Late gene expression was reduced by 70 and 90% at 48 and 72 hpi, respectively. Comparisons of CMX001 and cidofovir EC(90)s from 24 to 96 hpi demonstrated that CMX001 had a more rapid and enduring effect on BKV DNA and infectious progeny at 96 hpi than cidofovir. CMX001 at 0.31 μM had little effect on overall cell metabolism but reduced bromodeoxyuridine incorporation and host cell proliferation by 20 to 30%, while BKV infection increased cell proliferation in both rapidly dividing and near-confluent cultures. We conclude that CMX001 inhibits BKV replication with a longer-lasting effect than cidofovir at 400× lower levels, with fewer side effects on relevant host cells in vitro.

  5. Stimulation of Sigma-1 Receptor Ameliorates Depressive-like Behaviors in CaMKIV Null Mice.

    Science.gov (United States)

    Moriguchi, Shigeki; Sakagami, Hiroyuki; Yabuki, Yasushi; Sasaki, Yuzuru; Izumi, Hisanao; Zhang, Chen; Han, Feng; Fukunaga, Kohji

    2015-12-01

    Sigma-1 receptor (Sig-1R) is a molecular chaperone regulating calcium efflux from the neuronal endoplasmic reticulum to the mitochondria. Calcium/calmodulin-dependent protein kinase IV (CaMKIV) null mice exhibit depressive-like behaviors and impaired neurogenesis as assessed by bromodeoxyuridine (BrdU) incorporation into newborn cells of the hippocampal dentate gyrus (DG). Here, we demonstrate that chronic stimulation of Sig-1R by treatment with the agonist SA4503 or the SSRI fluvoxamine for 14 days improves depressive-like behaviors in CaMKIV null mice. By contrast, treatment with paroxetine, which lacks affinity for Sig-1R, did not alter these behaviors. Reduced numbers of BrdU-positive cells and decreased brain-derived neurotrophic factor (BDNF) mRNA expression and protein kinase B (Akt; Ser-473) phosphorylation seen in the DG of CaMKIV null mice were significantly rescued by chronic Sig-1R stimulation. Interestingly, reduced ATP production observed in the DG of CaMKIV null mice was improved by chronic Sig-1R stimulation. Such stimulation also improved hippocampal long-term potentiation (LTP) induction and maintenance, which are impaired in the DG of CaMKIV null mice. LTP rescue was closely associated with both increases in calcium/calmodulin-dependent protein kinase II (CaMKII) autophosphorylation and GluA1 (Ser-831) phosphorylation. Taken together, Sig-1R stimulation by SA4503 or fluvoxamine treatment increased hippocampal neurogenesis, which is closely associated with amelioration of depressive-like behaviors in CaMKIV null mice.

  6. Odontoblast response to cavity preparation with Er:YAG laser in rat molars: an immunohistochemical study.

    Science.gov (United States)

    Shigetani, Yoshimi; Suzuki, Hironobu; Ohshima, Hayato; Yoshiba, Kunihiko; Yoshiba, Nagako; Okiji, Takashi

    2013-07-01

    This study aimed to examine the dynamics of odontoblast-lineage cells following cavity preparation with erbium:yttrium-aluminum-garnet (Er:YAG) laser in rat molars. Cavity preparation was made with Er:YAG laser in the mesial surface of the maxillary left first molar of 8-week-old Wistar rats. Contralateral first molar served as unirradiated control. Immediately, 6 and 12 h and 1, 2, 3, 5 and 7 days after the lasing (n = 5, each), specimens were collected and processed for immunohistochemistry for heat-shock protein (HSP)-25 and nestin as markers for odontoblast-lineage cells. Cell proliferation assay using bromodeoxyuridine (BrdU) labeling was also performed. Unirradiated teeth showed HSP-25- and nestin-immunoreactivity in odontoblasts. At 6-12 h after irradiation, the odontoblastic layer was disorganized and some of odontoblasts lost the immunoreactivity to HSP-25 and nestin. At 1-2 days, however, HSP-25- and nestin-immunoreactivities in the odontoblast layer showed a noticeable recovery, resulting in the rearrangement of odontoblast-like cells intensely immunoreactive to HSP-25 and nestin at 3-7 days. BrdU-positive cells showed a significant increase at 2 days (P cavity preparation with Er:YAG laser induced mild and reversible damage to odontoblasts. The reparative process was characterized by the rearrangement of HSP-25- and nestin-immunoreactive odontoblast-like cells, which took place subsequent to the odontoblastic layer disorganization with partial loss of these immunoreactivities.

  7. Proliferation, migration, and differentiation of endogenous ependymal region stem/progenitor cells following minimal spinal cord injury in the adult rat.

    Science.gov (United States)

    Mothe, A J; Tator, C H

    2005-01-01

    Ependymal cells of the adult mammalian spinal cord exhibit stem/progenitor cell properties following injury. In the present study, we utilized intraventricular injection of 1,1'-dioctadecyl-6,6'-di(4-sulfophenyl)-3,3,3',3'-tetramethylindocarbocyanine (DiI) to label the ependyma lining the central canal to allow tracking of the migration of endogenous ependymal cells and their progeny after spinal cord injury (SCI). We developed a minimal injury model that preserved the integrity of the central canal and did not interfere with ependymal cell labeling. Three days following SCI, there was an 8.6-fold increase in the proliferative labeling index of the ependymal cells at the level of the needle track based on bromodeoxyuridine labeling, compared with 1 day post-injury. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) positive cells were not detected in the ependyma or surrounding gray matter, indicating that ependymal cells do not undergo apoptosis in response to minimal injury. Nestin was rapidly induced in the ependyma by 1 day and expression peaked by 7 days post-injury. We quantitated the number and distance of ependymal cell migration following minimal injury. The number of ependymal cells migrating from the region of the central canal increased by 3 days following minimal injury and DiI-labeled glial fibrillary acidic protein expressing cells were detected 14 days post-SCI, most of which migrated within 70 microm of the region of the central canal. These results show that a minimal SCI adjacent to the ependyma is sufficient to induce an endogenous ependymal cell response where ependymal stem/progenitor cells proliferate and migrate from the region of the central canal, differentiating primarily into astrocytes.

  8. Biciliated ependymal cell proliferation contributes to spinal cord growth.

    Science.gov (United States)

    Alfaro-Cervello, Clara; Soriano-Navarro, Mario; Mirzadeh, Zaman; Alvarez-Buylla, Arturo; Garcia-Verdugo, Jose Manuel

    2012-10-15

    Two neurogenic regions have been described in the adult brain, the lateral ventricle subventricular zone and the dentate gyrus subgranular zone. It has been suggested that neural stem cells also line the central canal of the adult spinal cord. Using transmission and scanning electron microscopy and immunostaining, we describe here the organization and cell types of the central canal epithelium in adult mice. The identity of dividing cells was determined by 3D ultrastructural reconstructions of [(3) H]thymidine-labeled cells and confocal analysis of bromodeoxyuridine labeling. The most common cell type lining the central canal had two long motile (9+2) cilia and was vimentin+, CD24+, FoxJ1+, Sox2+, and CD133+, but nestin- and glial fibrillary acidic protein (GFAP)-. These biciliated ependymal cells of the central canal (Ecc) resembled E2 cells of the lateral ventricles, but their basal bodies were different from those of E2 or E1 cells. Interestingly, we frequently found Ecc cells with two nuclei and four cilia, suggesting they are formed by incomplete cytokinesis or cell fusion. GFAP+ astrocytes with a single cilium and an orthogonally oriented centriole were also observed. The majority of dividing cells corresponded to biciliated Ecc cells. Central canal proliferation was most common during the active period of spinal cord growth. Pairs of labeled Ecc cells were observed within the central canal in adult mice 2.5 weeks post labeling. Our work suggests that the vast majority of postnatal dividing cells in the central canal are Ecc cells and their proliferation is associated with the growth of the spinal cord.

  9. Response of ependymal progenitors to spinal cord injury or enhanced physical activity in adult rat.

    Science.gov (United States)

    Cizkova, Dasa; Nagyova, Miriam; Slovinska, Lucia; Novotna, Ivana; Radonak, Jozef; Cizek, Milan; Mechirova, Eva; Tomori, Zoltan; Hlucilova, Jana; Motlik, Jan; Sulla, Igor; Vanicky, Ivo

    2009-09-01

    Ependymal cells (EC) in the spinal cord central canal (CC) are believed to be responsible for the postnatal neurogenesis following pathological or stimulatory conditions. In this study, we have analyzed the proliferation of the CC ependymal progenitors in adult rats processed to compression SCI or enhanced physical activity. To label dividing cells, a single daily injection of Bromo-deoxyuridine (BrdU) was administered over a 14-day-survival period. Systematic quantification of BrdU-positive ependymal progenitors was performed by using stereological principles of systematic, random sampling, and optical Dissector software. The number of proliferating BrdU-labeled EC increased gradually with the time of survival after both paradigms, spinal cord injury, or increased physical activity. In the spinal cord injury group, we have found 4.9-fold (4 days), 7.1-fold (7 days), 4.9-fold (10 days), and 5.6-fold (14 days) increase of proliferating EC in the rostro-caudal regions, 4 mm away from the epicenter. In the second group subjected to enhanced physical activity by running wheel, we have observed 2.1-2.6 fold increase of dividing EC in the thoracic spinal cord segments at 4 and 7 days, but no significant progression at 10-14 days. Nestin was rapidly induced in the ependymal cells of the CC by 2-4 days and expression decreased by 7-14 days post-injury. Double immunohistochemistry showed that dividing cells adjacent to CC expressed astrocytic (GFAP, S100beta) or nestin markers at 14 days. These data demonstrate that SCI or enhanced physical activity in adult rats induces an endogenous ependymal cell response leading to increased proliferation and differentiation primarily into macroglia or cells with nestin phenotype.

  10. Neural stem cell transplantation combined with erythropoietin for the treatment of spinal cord injury in rats.

    Science.gov (United States)

    Zhao, Yan; Zuo, Yuan; Jiang, Jianming; Yan, Huibo; Wang, Xiliang; Huo, Hunjun; Xiao, Yulong

    2016-10-01

    Spinal cord injury (SCI) comprises nerve and motor function disorders that may be caused by a variety of damaging factors and is challenging to treat. The aim of the present study was to investigate the regenerative effects of neural stem cell (NSC) transplantation combined with intraperitoneal injection of erythropoietin (EPO) on cross-sectional SCI in rats. A model of SCI was induced in 40 adult Wistar rats via the complete transection of the 10th thoracic vertebra (T10). The rats were allocated at random into 4 groups: Control, NSC, EPO and NSC + EPO groups (n=10 per group). Morphological alterations associated with axonal regeneration were detected using neurofilament (NF)-200 immunohistochemistry and immunofluorescence staining after 8 weeks. Basso, Beattie and Bresnahan (BBB) scoring was used to evaluate the recovery of hindlimb function. A total of 5 rats died following surgery, including 2 control rats and 1 rat each in the EPO, NSC and NSC + EPO groups. NSCs labeled with bromodeoxyuridine were observed to have survived and migrated in the spinal cord tissue after 8 weeks. Significant histomorphological differences were observed in the NSC and NSC + EPO groups compared with the EPO and control groups. Furthermore, the rats of the NSC + EPO group exhibited significantly enhanced axonal regeneration in the SCI area compared with the NSC group rats. The rats of the NSC and NSC + EPO groups exhibited significantly improved BBB scores compared with the EPO and control group rats at 7 days after treatment (PEPO group were significantly improved compared with those of the three other groups at 7 days after surgery (PEPO may benefit the survival and regeneration of injured axons, and accelerate the repair of injured spinal cord tissue, thus facilitating the functional recovery of hindlimb locomotor function in rats.

  11. Thoracic rat spinal cord contusion injury induces remote spinal gliogenesis but not neurogenesis or gliogenesis in the brain.

    Science.gov (United States)

    Franz, Steffen; Ciatipis, Mareva; Pfeifer, Kathrin; Kierdorf, Birthe; Sandner, Beatrice; Bogdahn, Ulrich; Blesch, Armin; Winner, Beate; Weidner, Norbert

    2014-01-01

    After spinal cord injury, transected axons fail to regenerate, yet significant, spontaneous functional improvement can be observed over time. Distinct central nervous system regions retain the capacity to generate new neurons and glia from an endogenous pool of progenitor cells and to compensate neural cell loss following certain lesions. The aim of the present study was to investigate whether endogenous cell replacement (neurogenesis or gliogenesis) in the brain (subventricular zone, SVZ; corpus callosum, CC; hippocampus, HC; and motor cortex, MC) or cervical spinal cord might represent a structural correlate for spontaneous locomotor recovery after a thoracic spinal cord injury. Adult Fischer 344 rats received severe contusion injuries (200 kDyn) of the mid-thoracic spinal cord using an Infinite Horizon Impactor. Uninjured rats served as controls. From 4 to 14 days post-injury, both groups received injections of bromodeoxyuridine (BrdU) to label dividing cells. Over the course of six weeks post-injury, spontaneous recovery of locomotor function occurred. Survival of newly generated cells was unaltered in the SVZ, HC, CC, and the MC. Neurogenesis, as determined by identification and quantification of doublecortin immunoreactive neuroblasts or BrdU/neuronal nuclear antigen double positive newly generated neurons, was not present in non-neurogenic regions (MC, CC, and cervical spinal cord) and unaltered in neurogenic regions (dentate gyrus and SVZ) of the brain. The lack of neuronal replacement in the brain and spinal cord after spinal cord injury precludes any relevance for spontaneous recovery of locomotor function. Gliogenesis was increased in the cervical spinal cord remote from the injury site, however, is unlikely to contribute to functional improvement.

  12. Effects of environmental stressors on lymphocyte proliferation in Florida manatees, Trichechus manatus latirostris.

    Science.gov (United States)

    Walsh, Cathy J; Luer, Carl A; Noyes, David R

    2005-02-10

    The health of many Florida manatees (Trichechus manatus latirostris) is adversely affected each year by exposure to cold weather or harmful algal blooms (red tide; Karenia brevis). Exposures can be sublethal, resulting in stressed animals that are rescued and taken to authorized facilities for rehabilitation, or lethal if exposures are prolonged or unusually severe. To investigate whether sublethal environmental exposures can impair immune function in manatees, rendering animals vulnerable to disease or death, mitogen-induced proliferation was assessed in lymphocytes from manatees exposed to cold temperatures (N=20) or red tide (N=19) in the wild, and compared to lymphocyte responses from healthy free-ranging manatees (N=32). All animals sampled for this study were adults. Lymphocytes were stimulated in vitro with either concanavalin A (ConA) or phytohemagglutinin (PHA) and proliferation was assessed after 96 h using incorporation of the thymidine analog, bromodeoxyuridine (BrdU), into newly synthesized DNA. Proliferation of lymphocytes from manatees rescued from exposure to red tide or cold-stress was approximately one-third that of lymphocytes from healthy free-ranging manatees. To examine the direct effects of red tide toxins on lymphocyte function, mitogen-induced proliferation was assessed following co-culture of lymphocytes with K. brevis toxin extracts. Stimulation indices decreased with increasing toxin concentration, with a significant decrease in proliferation occurring in the presence of 400 ng red tide toxins/ml. When lymphocytes from cold-stressed manatees were co-cultured with red tide toxin extracts, proliferative responses were reduced even further, suggesting multiple stressors may have synergistic effects on immune function in manatees.

  13. Interactions with the young down-regulate adult olfactory neurogenesis and enhance the maturation of olfactory neuroblasts in sheep mothers.

    Directory of Open Access Journals (Sweden)

    Maïna eBRUS

    2014-02-01

    Full Text Available New neurons are continuously added in the dentate gyrus and the olfactory bulb of mammalian brain. While numerous environmental factors controlling survival of newborn neurons have been extensively studied, regulation by social interactions is less documented. We addressed this question by investigating the influence of parturition and interactions with the young on neurogenesis in sheep mothers. Using Bromodeoxyuridine, a marker of cell division, in combination with markers of neuronal maturation, the percentage of neuroblasts and new mature neurons in the olfactory bulb and the dentate gyrus was compared between groups of parturient ewes which could interact or not with their lamb, and virgins. In addition, a morphological analysis was performed by measuring the dendritic arbor of neuroblasts in both structures. We showed that the post-partum period was associated with a decrease in olfactory and hippocampal adult neurogenesis. In the olfactory bulb, the suppressive effect on neuroblasts was dependent on interactions with the young whereas in the dentate gyrus the decrease in new mature neurons was associated with parturition. In addition, dendritic length and number of nodes of neuroblasts were significantly enhanced by interactions with the lamb in the olfactory bulb but not in the dentate gyrus. Because interactions with the young involved learning of the olfactory signature of the lamb, we hypothesize that this learning is associated with a down-regulation in olfactory neurogenesis and an enhancement of olfactory neuroblast maturation. Our assumption is that fewer new neurons decrease cell competition in the olfactory bulb and enhance maturation of those new neurons selected to participate in the learning of the young odor.

  14. Cornu cervi pantotrichum Pharmacopuncture Solution Facilitate Hair Growth in C57BL/6 Mice

    Directory of Open Access Journals (Sweden)

    Seon-Yong Lee

    2016-06-01

    Full Text Available Objectives: Cornu cervi pantotrichum (CCP has been widely used in Korean and China, as an anti-fatigue, anti-aging, and tonic agent to enhance the functions of the reproductive and the immune systems. Because CCP has various growth factors that play important roles in the development of hair follicles, we examined whether CCP pharmacopuncture solution (CCPPS was capable of promoting hair growth in an animal model. Methods: One day after hair depilation, CCPPS were topically applied to the dorsal skin of C57BL/6 mice once a day for 15 days. Hair growth activity was evaluated by using macro- and microscopic observations. Dorsal skin tissues were stained with hematoxylin and eosin. Expressions of bromodeoxyuridine (BrdU, proliferating cell nuclear antigen (PCNA, and fibroblast growth factor (FGF-7 were examined by using immunohistochemical staining. A reverse transcription polymerase chain reaction (RT-PCR analysis was also conducted to measure the messenger RNA (mRNA expression of FGF-7. Results: CCPPS induced more active hair growth than normal saline. Histologic analysis showed enlargement of the dermal papilla, elongation of the hair shaft, and expansion of hair thickness in CCPPS treated mice, indicating that CCPPS effectively induced the development of anagen. CCPPS treatment markedly increased the expressions of BrdU and PCNA in the hair follicles of C57BL/6 mice. In addition, CCPPS up regulated the expression of FGF-7, which plays an important role in the development of hair follicles. Conclusion: These results reveal that CCPPS facilitates hair re-growth by proliferation of hair follicular cells and up-regulation of FGF-7 and suggest that CCPPS can potentially be applied as an alternative treatment for patients with alopecia.

  15. The Epstein-Barr virus (EBV)-encoded protein kinase, EBV-PK, but not the thymidine kinase (EBV-TK), is required for ganciclovir and acyclovir inhibition of lytic viral production.

    Science.gov (United States)

    Meng, Qiao; Hagemeier, Stacy R; Fingeroth, Joyce D; Gershburg, Edward; Pagano, Joseph S; Kenney, Shannon C

    2010-05-01

    Ganciclovir (GCV) and acyclovir (ACV) are guanine nucleoside analogues that inhibit lytic herpesvirus replication. GCV and ACV must be monophosphorylated by virally encoded enzymes to be converted into nucleotides and incorporated into viral DNA. However, whether GCV and/or ACV phosphorylation in Epstein-Barr virus (EBV)-infected cells is mediated primarily by the EBV-encoded protein kinase (EBV-PK), the EBV-encoded thymidine kinase (EBV-TK), or both is controversial. To examine this question, we constructed EBV mutants containing stop codons in either the EBV-PK or EBV-TK open reading frame and selected for stable 293T clones latently infected with wild-type EBV or each of the mutant viruses. Cells were induced to the lytic form of viral replication with a BZLF1 expression vector in the presence and absence of various doses of GCV and ACV, and infectious viral titers were determined by a green Raji cell assay. As expected, virus production in wild-type EBV-infected 293T cells was inhibited by both GCV (50% inhibitory concentration [IC(50)] = 1.5 microM) and ACV (IC(50) = 4.1 microM). However, the EBV-PK mutant (which replicates as well as the wild-type (WT) virus in 293T cells) was resistant to both GCV (IC(50) = 19.6 microM) and ACV (IC(50) = 36.4 microM). Expression of the EBV-PK protein in trans restored GCV and ACV sensitivity in cells infected with the PK mutant virus. In contrast, in 293T cells infected with the TK mutant virus, viral replication remained sensitive to both GCV (IC(50) = 1.2 microM) and ACV (IC(50) = 2.8 microM), although susceptibility to the thymine nucleoside analogue, bromodeoxyuridine, was reduced. Thus, EBV-PK but not EBV-TK mediates ACV and GCV susceptibilities.

  16. Prominin-1 (CD133 defines both stem and non-stem cell populations in CNS development and gliomas.

    Directory of Open Access Journals (Sweden)

    Karl Holmberg Olausson

    Full Text Available Prominin-1 (CD133 is a commonly used cancer stem cell marker in central nervous system (CNS tumors including glioblastoma (GBM. Expression of Prom1 in cancer is thought to parallel expression and function in normal stem cells. Using RNA in situ hybridization and antibody tools capable of detecting multiple isoforms of Prom1, we find evidence for two distinct Prom1 cell populations in mouse brain. Prom1 RNA is first expressed in stem/progenitor cells of the ventricular zone in embryonic brain. Conversely, in adult mouse brain Prom1 RNA is low in SVZ/SGZ stem cell zones but high in a rare but widely distributed cell population (Prom1(hi. Lineage marker analysis reveals Prom1(hi cells are Olig2+Sox2+ glia but Olig1/2 knockout mice lacking oligodendroglia retain Prom1(hi cells. Bromodeoxyuridine labeling identifies Prom1(hi as slow-dividing distributed progenitors distinct from NG2+Olig2+ oligodendrocyte progenitors. In adult human brain, PROM1 cells are rarely positive for OLIG2, but express astroglial markers GFAP and SOX2. Variability of PROM1 expression levels in human GBM and patient-derived xenografts (PDX - from no expression to strong, uniform expression--highlights that PROM1 may not always be associated with or restricted to cancer stem cells. TCGA and PDX data show that high expression of PROM1 correlates with poor overall survival. Within proneural subclass tumors, high PROM1 expression correlates inversely with IDH1 (R132H mutation. These findings support PROM1 as a tumor cell-intrinsic marker related to GBM survival, independent of its stem cell properties, and highlight potentially divergent roles for this protein in normal mouse and human glia.

  17. Multi-session transcranial direct current stimulation (tDCS elicits inflammatory and regenerative processes in the rat brain.

    Directory of Open Access Journals (Sweden)

    Maria Adele Rueger

    Full Text Available Transcranial direct current stimulation (tDCS is increasingly being used in human studies as an adjuvant tool to promote recovery of function after stroke. However, its neurobiological effects are still largely unknown. Electric fields are known to influence the migration of various cell types in vitro, but effects in vivo remain to be shown. Hypothesizing that tDCS might elicit the recruitment of cells to the cortex, we here studied the effects of tDCS in the rat brain in vivo. Adult Wistar rats (n = 16 were randomized to either anodal or cathodal stimulation for either 5 or 10 consecutive days (500 µA, 15 min. Bromodeoxyuridine (BrdU was given systemically to label dividing cells throughout the experiment. Immunohistochemical analyses ex vivo included stainings for activated microglia and endogenous neural stem cells (NSC. Multi-session tDCS with the chosen parameters did not cause a cortical lesion. An innate immune response with early upregulation of Iba1-positive activated microglia occurred after both cathodal and anodal tDCS. The involvement of adaptive immunity as assessed by ICAM1-immunoreactivity was less pronounced. Most interestingly, only cathodal tDCS increased the number of endogenous NSC in the stimulated cortex. After 10 days of cathodal stimulation, proliferating NSC increased by ∼60%, with a significant effect of both polarity and number of tDCS sessions on the recruitment of NSC. We demonstrate a pro-inflammatory effect of both cathodal and anodal tDCS, and a polarity-specific migratory effect on endogenous NSC in vivo. Our data suggest that tDCS in human stroke patients might also elicit NSC activation and modulate neuroinflammation.

  18. Spallanzani's mouse: a model of restoration and regeneration.

    Science.gov (United States)

    Heber-Katz, E; Leferovich, J M; Bedelbaeva, K; Gourevitch, D

    2004-01-01

    The ability to regenerate is thought to be a lost phenotype in mammals, though there are certainly sporadic examples of mammalian regeneration. Our laboratory has identified a strain of mouse, the MRL mouse, which has a unique capacity to heal complex tissue in an epimorphic fashion, i.e., to restore a damaged limb or organ to its normal structure and function. Initial studies using through-and-through ear punches showed rapid full closure of the ear holes with cartilage growth, new hair follicles, and normal tissue architecture reminiscent of regeneration seen in amphibians as opposed to the scarring usually seen in mammals. Since the ear hole closure phenotype is a quantitative trait, this has been used to show-through extensive breeding and backcrossing--that the trait is heritable. Such analysis reveals that there is a complex genetic basis for this trait with multiple loci. One of the major phenotypes of the MRL mouse is a potent remodeling response with the absence or a reduced level of scarring. MRL healing is associated with the upregulation of the metalloproteinases MMP-2 and MMP-9 and the downregulation of their inhibitors TIMP-2 and TIMP-3, both present in inflammatory cells such as neutrophils and macrophages. This model has more recently been extended to the heart. In this case, a cryoinjury to the right ventricle leads to near complete scarless healing in the MRL mouse whereas scarring is seen in the control mouse. In the MRL heart, bromodeoxyuridine uptake by cardiomyocytes filling the wound site can be seen 60 days after injury. This does not occur in the control mouse. Function in the MRL heart, as measured by echocardiography, returns to normal.

  19. Damaged DNA binding protein 2 plays a role in breast cancer cell growth.

    Directory of Open Access Journals (Sweden)

    Zilal Kattan

    Full Text Available The Damaged DNA binding protein 2 (DDB2, is involved in nucleotide excision repair as well as in other biological processes in normal cells, including transcription and cell cycle regulation. Loss of DDB2 function may be related to tumor susceptibility. However, hypothesis of this study was that DDB2 could play a role in breast cancer cell growth, resulting in its well known interaction with the proliferative marker E2F1 in breast neoplasia. DDB2 gene was overexpressed in estrogen receptor (ER-positive (MCF-7 and T47D, but not in ER-negative breast cancer (MDA-MB231 and SKBR3 or normal mammary epithelial cell lines. In addition, DDB2 expression was significantly (3.0-fold higher in ER-positive than in ER-negative tumor samples (P = 0.0208 from 16 patients with breast carcinoma. Knockdown of DDB2 by small interfering RNA in MCF-7 cells caused a decrease in cancer cell growth and colony formation. Inversely, introduction of the DDB2 gene into MDA-MB231 cells stimulated growth and colony formation. Cell cycle distribution and 5 Bromodeoxyuridine incorporation by flow cytometry analysis showed that the growth-inhibiting effect of DDB2 knockdown was the consequence of a delayed G1/S transition and a slowed progression through the S phase of MCF-7 cells. These results were supported by a strong decrease in the expression of S phase markers (Proliferating Cell Nuclear Antigen, cyclin E and dihydrofolate reductase. These findings demonstrate for the first time that DDB2 can play a role as oncogene and may become a promising candidate as a predictive marker in breast cancer.

  20. Tracheal dysplasia precedes bronchial dysplasia in mouse model of N-nitroso trischloroethylurea induced squamous cell lung cancer.

    Directory of Open Access Journals (Sweden)

    Moumita Ghosh

    Full Text Available Squamous cell lung cancer (SCC is the second leading cause of lung cancer death in the US and has a 5-year survival rate of only 16%. Histological changes in the bronchial epithelium termed dysplasia are precursors to invasive SCC. However, the cellular mechanisms that cause dysplasia are unknown. To fill this knowledge gap, we used topical application of N-nitroso-tris chloroethylurea (NTCU for 32 weeks to induce squamous dysplasia and SCC in mice. At 32 weeks the predominant cell type in the dysplastic airways was Keratin (K 5 and K14 expressing basal cells. Notably, basal cells are extremely rare in the normal mouse bronchial epithelium but are abundant in the trachea. We therefore evaluated time-dependent changes in tracheal and bronchial histopathology after NTCU exposure (4, 8, 12, 16, 25 and 32 weeks. We show that tracheal dysplasia occurs significantly earlier than that of the bronchial epithelium (12 weeks vs. 25 weeks. This was associated with increased numbers of K5+/K14+ tracheal basal cells and a complete loss of secretory (Club cell secretory protein expressing CCSP+ and ciliated cells. TUNEL staining of NTCU treated tissues confirmed that the loss of CCSP+ and ciliated cells was not due to apoptosis. However, mitotic index (measured by bromodeoxyuridine incorporation showed that NTCU treatment increased proliferation of K5+ basal cells in the trachea, and altered bronchial mitotic population from CCSP+ to K5+ basal cells. Thus, we demonstrate that NTCU-induced lung epithelial dysplasia starts in the tracheal epithelium, and is followed by basal cell metaplasia of the bronchial epithelium. This analysis extends our knowledge of the NTCU-SCC model by defining the early changes in epithelial cell phenotypes in distinct airway locations, and this may assist in identifying new targets for future chemoprevention studies.

  1. Imipramine treatment improves cognitive outcome associated with enhanced hippocampal neurogenesis after traumatic brain injury in mice.

    Science.gov (United States)

    Han, Xiaodi; Tong, Jing; Zhang, Jun; Farahvar, Arash; Wang, Ernest; Yang, Jiankai; Samadani, Uzma; Smith, Douglas H; Huang, Jason H

    2011-06-01

    Previous animal and human studies have demonstrated that chronic treatment with several different antidepressants can stimulate neurogenesis, neural remodeling, and synaptic plasticity in the normal hippocampus. Imipramine is a commonly used tricyclic antidepressant (TCA). We employed a controlled cortical impact (CCI) mouse model of traumatic brain injury (TBI) to assess the effect of imipramine on neurogenesis and cognitive and motor function recovery after TBI. Mice were given daily imipramine injections for either 2 or 4 weeks after injury. Bromodeoxyuridine (BrdU) was administered 3-7 days post-brain injury to label the cells that proliferated as a result of the injury. We assessed the effects of imipramine on post-traumatic motor function using a beam-walk test and an assessment of cognitive function: the novel object recognition test (NOR). Histological analyses were performed at 2 and 4 weeks after CCI. Brain-injured mice treated with imipramine showed significantly improved cognitive function compared to a saline-treated group (pimipramine-treated and saline-treated mice. Histological examination revealed increased preservation of proliferation of Ki-67- and BrdU-positive cells in the hippocampal dentate gyrus (DG) at 2 and 4 weeks after TBI. Immunofluorescence double-labeling with BrdU and neuron-specific markers at 4 weeks after injury showed that most progenitors became neurons in the DG and astrocytes in the hilus. Notably, treatment with imipramine increased preservation of the total number of newly-generated neurons. Our findings provide direct evidence that imipramine treatment contributes to cognitive improvement after TBI, perhaps by enhanced hippocampal neurogenesis.

  2. Exposure to N-ethyl-N-nitrosourea in adult mice alters structural and functional integrity of neurogenic sites.

    Directory of Open Access Journals (Sweden)

    Vivian Capilla-Gonzalez

    Full Text Available BACKGROUND: Previous studies have shown that prenatal exposure to the mutagen N-ethyl-N-nitrosourea (ENU, a N-nitroso compound (NOC found in the environment, disrupts developmental neurogenesis and alters memory formation. Previously, we showed that postnatal ENU treatment induced lasting deficits in proliferation of neural progenitors in the subventricular zone (SVZ, the main neurogenic region in the adult mouse brain. The present study is aimed to examine, in mice exposed to ENU, both the structural features of adult neurogenic sites, incorporating the dentate gyrus (DG, and the behavioral performance in tasks sensitive to manipulations of adult neurogenesis. METHODOLOGY/PRINCIPAL FINDINGS: 2-month old mice received 5 doses of ENU and were sacrificed 45 days after treatment. Then, an ultrastructural analysis of the SVZ and DG was performed to determine cellular composition in these regions, confirming a significant alteration. After bromodeoxyuridine injections, an S-phase exogenous marker, the immunohistochemical analysis revealed a deficit in proliferation and a decreased recruitment of newly generated cells in neurogenic areas of ENU-treated animals. Behavioral effects were also detected after ENU-exposure, observing impairment in odor discrimination task (habituation-dishabituation test and a deficit in spatial memory (Barnes maze performance, two functions primarily related to the SVZ and the DG regions, respectively. CONCLUSIONS/SIGNIFICANCE: The results demonstrate that postnatal exposure to ENU produces severe disruption of adult neurogenesis in the SVZ and DG, as well as strong behavioral impairments. These findings highlight the potential risk of environmental NOC-exposure for the development of neural and behavioral deficits.

  3. Contrasting activity patterns determined by BrdU incorporation in bacterial ribotypes from the Arctic Ocean in winter

    Directory of Open Access Journals (Sweden)

    Pierre E Galand

    2013-05-01

    Full Text Available The winter Arctic Ocean is one of the most unexplored marine environments from a microbiological perspective. Heterotrophic bacteria maintain their activity at a baseline level during the extremely low energy conditions of the winter, but little is known about the specific phylotypes that have the potential to survive and grow in such harsh environment. In this study, we aimed at identifying actively growing ribotypes in winter Arctic Ocean seawater cultures by experimental incubations with the thymidine analogue bromodeoxyuridine (BrdU, followed by immunocapturing, terminal restriction fragment length polymorphism (TRFLP fingerprinting, cloning and sequencing the 16S rRNA gene. We incubated water collected at different months over the Arctic winter and showed that the actively growing bacterial fraction, taking up BrdU, represented only a subset of the total community. Among the BrdU-labeled bacterial taxa we identified the Flavobacteria Polaribacter, the Alphaproteobacteria SAR11, the Gammaproteobacteria Arctic 96B-16 cluster and, predominately, members of Colwellia spp. Interestingly, Colwellia sequences formed three clusters (93 and 97% pairwise 16S rRNA identity that contributed in contrasting ways to the active communities in the incubations. Polaribacter, Arctic 96B-16 and one cluster of Colwellia were more abundant in the active community represented by the BrdU labelled DNA. In contrast, SAR11 and two other Colwellia clusters were underrepresented in the BrdU labelled community compared to total communities. Despite the limitation of the long incubations needed to label slow growing arctic communities, the BrdU approach revealed the potential for active growth in low-energy conditions in some relevant groups of polar bacteria, including Polaribacter and Arctic 96B-16. Moreover, under similar incubation conditions, the growth of different Colwellia ribotypes varied, suggesting that related clusters of Colwellia may have distinct

  4. Involvement of estrogen receptor-βin farrerol inhibition of rat thoracic aorta vascular Smooth muscle cell proliferation

    Institute of Scientific and Technical Information of China (English)

    Qun-yi LI; Li CHEN; Yan-hui ZHU; Meng ZHANG; Yi-ping WANG; Ming-wei WANG

    2011-01-01

    AIm:TO investigate the effect of farrerol,a major active component isolated from a traditional Chinese herb"Man-shan-hong"(the dried Ieaves of Rhododendron dauncum L)on fetal bovine serum(FBS)-induced proliferation of cultured vascular smooth muscle cells (VSMCs)of rat thoracic aorta.Methods:VSMCs proliferation,DNA synthesis and cell cycle progression were studied using the MTT assay,bromodeoxyuridine(BrdU)incorporation and flow cytometry,respectively.The mRNA levels of cell cycle proteins were quantified using real-time RT-PCR, and the phosphorylation of ERKl/2 was determined using Western blotting.Reporter gene and receptor binding assays were employed to study the interaction between farrerol and estrogen receptors(ERs).Results:FarreroI(0.3-10 μmol/L)inhibited VSMC proliferation and DNA synthesis induced by 5%FBS in a concentration-dependent manner.The effects were associated with G,cell cycle arrest.down-regulation of cell cycle proteins and reduction in FBS-induced ERKl/2 phosphorylation.Using a reporter gene.it was found that farrerol(3 μmol/L)induced 2.1-fold transcription of ER.In receptor binding assays, farrerol inhibited the binding of [3H]estradiol for ERa and ERβ with IC50 values of 57 μmol/L and 2.7 μmol/L, respectively.implying that farrerol had a higher affinity for ERl3.Finally,the inhibition of VSMC proliferation by farrerol(3 μmol/L)was abolished by the specific ERβ antagonist PHTPP(5 μmol/L).Conclusion:FarreroI acts as a functional phytoestrogen to inhibit FBS-induced VSMC proliferation, mainly via interaction with ERβ,which may be helpful in the treatment of cardiovascular diseases related to abnormal VSMCs proliferation.

  5. PSA-NCAM is expressed in immature, but not recently generated, neurons in the adult cat cerebral cortex layer II

    Directory of Open Access Journals (Sweden)

    Emilio eVarea

    2011-02-01

    Full Text Available Neuronal production persists during adulthood in the dentate gyrus and the olfactory bulb, where substantial numbers of immature neurons can be found. These cells can also be found in the paleocortex layer II of adult rodents, but in this case most of them have been generated during embryogenesis. Recent reports have described the presence of similar cells, with a wider distribution, in the cerebral cortex of adult cats and primates and have suggested that they may develop into interneurons. The objective of this study is to verify this hypothesis and to explore the origin of these immature neurons in adult cats. We have analysed their distribution using immunohistochemical analysis of the polysialylated form of the neural cell adhesion molecule (PSA-NCAM and their phenotype using markers of mature neurons and different interneuronal populations. Additionally, we have explored the origin of these cells administering 5'bromodeoxyuridine (5’BrdU during adulthood. Immature neurons were widely dispersed in the cerebral cortex layers II and upper III, being specially abundant in the piriform and entorhinal cortices, in the ventral portions of the frontal and temporoparietal lobes, but relatively scarce in dorsal regions, such as the primary visual areas. Only a small fraction of PSA-NCAM expressing cells in layer II expressed the mature neuronal marker NeuN and virtually none of them expressed calcium binding proteins or neuropeptides. By contrast, most, if not all of these cells expressed the transcription factor Tbr-1, specifically expressed by pallium-derived principal neurons, but not CAMKII, a marker of mature excitatory neurons. Absence of PSA-NCAM/5’BrdU co-localization suggests that, as in rats, these cells were not generated during adulthood. Together, these results indicate that immature neurons in the adult cat cerebral cortex layer II are not recently generated and that they may differentiate into principal neurons.

  6. Modulatory role of sensory innervation on hair follicle stem cell progeny during wound healing of the rat skin.

    Directory of Open Access Journals (Sweden)

    Eduardo Martínez-Martínez

    Full Text Available BACKGROUND: The bulge region of the hair follicle contains resident epithelial stem cells (SCs that are activated and mobilized during hair growth and after epidermal wounding. However, little is known about the signals that modulate these processes. Clinical and experimental observations show that a reduced supply of sensory innervation is associated with delayed wound healing. Since axon terminals of sensory neurons are among the components of the bulge SC niche, we investigated whether these neurons are involved in the activation and mobilization of the hair stem cells during wound healing. METHODOLOGY/PRINCIPAL FINDINGS: We used neonatal capsaicin treatment to reduce sensory terminals in the rat skin and performed morphometric analyses using design-based stereological methods. Epithelial proliferation was analyzed by quantifying the number of bromodeoxyuridine-labeled (BrdU(+ nuclei in the epidermis and hair follicles. After wounding, the epidermis of capsaicin-treated rats presented fewer BrdU(+ nuclei than in control rats. To assess SC progeny migration, we employed a double labeling protocol with iododeoxyuridine and chlorodeoxyuridine (IdU(+/CldU(+. The proportion of double-labeled cells was similar in the hair follicles of both groups at 32 h postwounding. IdU(+/CldU(+ cell proportion increased in the epidermis of control rats and decreased in treated rats at 61 h postwounding. The epidermal volume immunostained for keratin 6 was greater in treated rats at 61 h. Confocal microscopy analysis revealed that substance P (SP and calcitonin gene-related peptide (CGRP receptor immunoreactivity were both present in CD34(+ and BrdU-retaining cells of the hair follicles. CONCLUSIONS/SIGNIFICANCE: Our results suggest that capsaicin denervation impairs SC progeny egress from the hair follicles, a circumstance associated with a greater epidermal activation. Altogether, these phenomena would explain the longer times for healing in denervated skin

  7. Ephrin-A1-mediated dopaminergic neurogenesis and angiogenesis in a rat model of Parkinson's disease.

    Directory of Open Access Journals (Sweden)

    Xuefeng Jing

    Full Text Available Cells of the neural stem cell lineage in the adult subventricular zone (SVZ respond to brain insult by increasing their numbers and migrating through the rostral migratory stream. However, in most areas of the brain other than the SVZ and the subgranular zone of the dentate gyrus, such a regenerative response is extremely weak. Even these two neurogenic regions do not show extensive regenerative responses to repair tissue damage, suggesting the presence of an intrinsic inhibitory microenvironment (niche for stem cells. In the present study, we assessed the effects of injection of clustered ephrin-A1-Fc into the lateral ventricle of rats with unilateral nigrostriatal dopamine depletion. Ephrin-A1-Fc clustered by anti-IgG(Fc antibody was injected stereotaxically into the ipsilateral lateral ventricle of rats with unilateral nigrostriatal lesions induced by 6-hydroxydopamine, and histologic analysis and behavioral tests were performed. Clustered ephrin-A1-Fc transformed the subventricular niche, increasing bromodeoxyuridine-positive cells in the subventricular area, and the cells then migrated to the striatum and differentiated to dopaminergic neurons and astrocytes. In addition, clustered ephrin-A1-Fc enhanced angiogenesis in the striatum on the injected side. Along with histologic improvements, behavioral derangement improved dramatically. These findings indicate that the subventricular niche possesses a mechanism for regulating both stem cell and angiogenic responses via an EphA-mediated signal. We conclude that activation of EphA receptor-mediated signaling by clustered ephrin-A1-Fc from within the lateral ventricle could potentially be utilized in the treatment of neurodegenerative diseases such as Parkinson's disease.

  8. Different routes of administration of human umbilical tissue-derived cells improve functional recovery in the rat after focal cerebral ischemia.

    Science.gov (United States)

    Zhang, Li; Li, Yi; Romanko, Michael; Kramer, Brian C; Gosiewska, Anna; Chopp, Michael; Hong, Klaudyne

    2012-12-13

    Human umbilical tissue-derived cells (hUTC) are a potential neurorestorative candidate for stroke treatment. Here, we test the effects of hUTC treatment in a rat model of stroke via various routes of administration. Rats were treated with hUTC or phosphate-buffered saline (PBS) via different routes including intraarterial (IA), intravenous (IV), intra-cisterna magna (ICM), lumber intrathecal (IT), or intracerebral injection (IC) at 24h after stroke onset. Treatment with hUTC via IV and IC route led to significant functional improvements starting at day 14, which persisted to day 60 compared with respective PBS-treated rats. HUTC administered via IA, ICM, and IT significantly improved neurological functional recovery starting at day 14 and persisted up to day 49 compared with PBS-treated rats. Although IA administration resulted in the highest donor cell number detected within the ischemic brain compared to the other routes, hUTC treatments significantly increased ipsilateral bromodeoxyuridine incorporating subventricular zone (SVZ) cells and vascular density in the ischemic boundary compared with PBS-treated rats regardless of the route of administration. While rats received hUTC treatment via IA, IV, IC, and ICM routes showed greater synaptophysin immunoreactivity, significant reductions in TUNEL-positive cells in the ipsilateral hemisphere were observed in IA, IV, and IC routes compared with PBS-treated rats. hUTC treatments did not reduce infarct volume when compared to the PBS groups. Our data indicate that hUTC administered via multiple routes provide therapeutic benefit after stroke. The enhancement of neurorestorative events in the host brain may contribute to the therapeutic benefits of hUTC in the treatment of stroke.

  9. Early-life stress increases the survival of midbrain neurons during postnatal development and enhances reward-related and anxiolytic-like behaviors in a sex-dependent fashion.

    Science.gov (United States)

    Chocyk, Agnieszka; Majcher-Maślanka, Iwona; Przyborowska, Aleksandra; Maćkowiak, Marzena; Wędzony, Krzysztof

    2015-08-01

    Clinical studies have suggested that early-life stress (ELS) increases the risk of psychopathologies that are strongly associated with dysfunction of dopaminergic neurotransmission. Thus, ELS may interfere with the development and maturation of the dopaminergic system; however, the mechanisms involved in such interference are poorly understood. In the present study, we investigated the effect of ELS on the survival of specific populations of neurons in the substantia nigra pars compacta (SNc) and ventral tegmental area (VTA) during postnatal development. First, we injected bromodeoxyuridine (BrdU) into pregnant rat dams on embryonic days 12, 13 and 14 to permanently label midbrain neurons. Then, after birth, the dams and litters were subjected to a maternal separation (MS) procedure to model ELS conditions. The number of BrdU+ neurons and the total number of neurons (cresyl violet+, CV+) were estimated in both male and female juvenile, adolescent, and adult rats. Moreover, sucrose preference and anxiety-like behaviors were studied during adulthood. We found that MS permanently increased the number of BrdU+ and CV+ neurons in the VTA of males. In the SNc, a temporary increase in the number of BrdU+ neurons was observed in juvenile MS males; however, only adult MS males displayed an increase in the number of CV+ neurons. Immunofluorescence analysis implied that MS affected the fate of non-dopaminergic neurons. MS males displayed anxiolytic-like behavior and an increase in sucrose preference. These results suggest that ELS induces distinct dysregulation in the midbrain circuitry of males, which may lead to sex-specific psychopathology of the reward system.

  10. Allopregnanolone enhances the neurogenesis of midbrain dopaminergic neurons in APPswe/PSEN1 mice.

    Science.gov (United States)

    Zhang, P; Xie, M Q; Ding, Y-Q; Liao, M; Qi, S S; Chen, S X; Gu, Q Q; Zhou, P; Sun, C Y

    2015-04-01

    An earlier study has demonstrated that exogenous allopregnanolone (APα) can reverse the reduction of tyrosine hydroxylase (TH)-positive neurons in the substantia nigra pars compacta (SNpc) of 3-month-old male triple transgenic Alzheimer's disease mouse (3xTgAD). This paper is focused on further clarifying the origin of these new-born TH-positive neurons induced by exogenous APα treatment. We performed a deeper research in another AD mouse model, 4-month-old male APPswe/PSEN1 double transgenic AD mouse (2xTgAD) by measuring APα concentration and counting immunopositive neurons using enzyme-linked immunosorbent assay (ELISA) and unbiased stereology. It was found that endogenous APα level and the number of TH-positive neurons were reduced in the 2xTgAD mice, and these reductions were present prior to the appearance of β-amyloid (Aβ)-positive plaques. Furthermore, a single 20mg/kg of exogenous APα treatment prevented the decline of total neurons, TH-positive neurons and TH/bromodeoxyuridine (BrdU) double-positive neurons in the SNpc of 2xTgAD mice although the decreased intensity of TH-positive fibers was not rescued in the striatum. It was also noted that exogenous APα administration had an apparent increase in the doublecortin (DCX)-positive neurons and DCX/BrdU double-positive neurons of subventricular zone (SVZ), as well as in the percentage of neuronal nuclear antigen (NeuN)/BrdU double-positive neurons of the SNpc in the 2xTgAD mice. These findings indicate that a lower level of endogenous APα is implicated in the loss of midbrain dopaminergic neurons in the 2xTgAD mice, and exogenous APα-induced a significant increase in the new-born dopaminergic neurons might be derived from the proliferating and differentiation of neural stem niche of SVZ.

  11. Frequencies of chromosomal aberrations and sister chromatid exchanges in the benthic worm Neanthes arenaceodentata exposed to ionizing radiation

    Energy Technology Data Exchange (ETDEWEB)

    Harrison, F.L.; Rice, D.W. Jr., Moore, D.H.

    1984-07-01

    Traditional bioassays are unsuitable for assessing sublethal effects from ocean disposal of low-level radioactive waste because mortality and phenotypic responses are not anticipated. We compared the usefulness of chromosomal aberration and sister chromatid exchange (SCE) induction as measures of low-level radiation effects in a sediment-dwelling marine worm, Neanthes arenaceodentata. The SCEs, in contrast to chromosomal aberrations, do not alter the overall chromosome morphology and in mammalian cells appear to be a more sensitive indicator of DNA alterations caused by environmental mutagens. Newly hatched larvae were exposed to two radiation-exposure regimes of either x rays at a high dose rate of 0.7 Gy (70 rad)/min for as long as 5.5 min or to /sup 60/Co gamma rays at a low dose rate of from 4.8 x 10/sup -5/ to 1.2 x 10/sup -1/ Gy (0.0048 to 12 rad)/h for 24 h. After irradiation, the larvae were exposed to 3 x 10/sup -5/M bromodeoxyuridine (BrdUrd) for 28 h (x-ray-irradiated larvae) or for 54 h (/sup 60/Co-irradiated larvae). Larval cells were examined for the proportion of cells in first, second, and third or greater division. Frequencies of chromosomal aberrations and SCEs were determined in first and second division cells, respectively. Results from x-ray irradiation indicated that dose-related increases occur in chromosome and chromatid deletions, but a dose of equal or greater 2 Gy (equal to or greater than 200 rad) was required to observe a significant increase. Worm larvae receiving /sup 60/Co irradiation showed elevated SCE frequencies with a significant increase of 0.6 Gy (60 rad). We suggest that both SCEs and chromosomal aberrations may be useful for measuring effects on genetic material induced by radiation. 56 references, 7 figures, 9 tables.

  12. Effects of gamma-radiation on cell growth, cycle arrest, death, and superoxide dismutase expression by DU 145 human prostate cancer cells

    Directory of Open Access Journals (Sweden)

    V. Vucic

    2006-02-01

    Full Text Available Gamma-irradiation (gamma-IR is extensively used in the treatment of hormone-resistant prostate carcinoma. The objective of the present study was to investigate the effects of 60Co gamma-IR on the growth, cell cycle arrest and cell death of the human prostate cancer cell line DU 145. The viability of DU 145 cells was measured by the Trypan blue exclusion assay and the 3(4,5-dimethylthiazol-2-yl-2,5,diphenyltetrazolium bromide test. Bromodeoxyuridine incorporation was used for the determination of cell proliferation. Cell cycle arrest and cell death were analyzed by flow cytometry. Superoxide dismutase (SOD, specifically CuZnSOD and MnSOD protein expression, after 10 Gy gamma-IR, was determined by Western immunoblotting analysis. gamma-IR treatment had a significant (P < 0.001 antiproliferative and cytotoxic effect on DU 145 cells. Both effects were time and dose dependent. Also, the dose of gamma-IR which inhibited DNA synthesis and cell proliferation by 50% was 9.7 Gy. Furthermore, gamma-IR induced cell cycle arrest in the G2/M phase and the percentage of cells in the G2/M phase was increased from 15% (control to 49% (IR cells, with a nonsignificant induction of apoptosis. Treatment with 10 Gy gamma-IR for 24, 48, and 72 h stimulated CuZnSOD and MnSOD protein expression in a time-dependent manner, approximately by 3- to 3.5-fold. These data suggest that CuZnSOD and MnSOD enzymes may play an important role in the gamma-IR-induced changes in DU 145 cell growth, cell cycle arrest and cell death.

  13. Protective effects of a phosphatidylcholine-enriched diet in lipopolysaccharide-induced experimental neuroinflammation in the rat.

    Science.gov (United States)

    Tokés, Tünde; Eros, Gábor; Bebes, Attila; Hartmann, Petra; Várszegi, Szilvia; Varga, Gabriella; Kaszaki, József; Gulya, Károly; Ghyczy, Miklós; Boros, Mihály

    2011-11-01

    Our goal was to characterize the neuroprotective properties of orally administered phosphatidylcholine (PC) in a rodent model of systemic inflammation. Sprague-Dawley rats were killed at 3 h, 1 day, 3 days, or 7 days after i.p. administration of lipopolysaccharide (LPS) to determine the plasma levels of tumor necrosis factor α (TNF-α) and interleukin 6 cytokines. The control group and one group of LPS-treated animals were nourished with standard laboratory chow, whereas another LPS-treated group received a special diet enriched with 1% PC for 5 days before the administration of LPS and thereafter during the 7-day observation period. Immunohistochemistry was performed to visualize the bromodeoxyuridine and doublecortin-positive neuroprogenitor cells and Iba1-positive microglia in the hippocampus, whereas the degree of mucosal damage was evaluated on ileal and colon biopsy samples after hematoxylin-eosin staining. The activities of proinflammatory myeloperoxidase and xanthine-oxidoreductase and the tissue nitrite/nitrate (NOx) level were additionally determined, and the cognitive functions were monitored via Morris water maze testing. The inflammatory challenge transiently increased the hippocampal NOx level and led to microglia accumulation and decreased neurogenesis. The intestinal damage, mucosal myeloperoxidase, xanthine-oxidoreductase, and NOx changes were less pronounced, and long-lasting behavioral alterations were not observed. Phosphatidylcholine pretreatment reduced the plasma TNF-α and hippocampal NOx changes and prevented the decreased neurogenesis. These data demonstrated the relative susceptibility of the brain to the consequences of transient peripheral inflammatory stimuli. Phosphatidylcholine supplementation did not reduce the overall extent of peripheral inflammatory activation, but efficiently counteracted the disturbed hippocampal neurogenesis by lowering circulating TNF-α concentrations.

  14. MicroRNA mir-16 is anti-proliferative in enterocytes and exhibits diurnal rhythmicity in intestinal crypts

    Energy Technology Data Exchange (ETDEWEB)

    Balakrishnan, Anita, E-mail: anita.balakrishnan@doctors.org.uk [Department of Surgery, Brigham and Women' s Hospital, Boston, MA 02115 (United States); Department of Surgery, Harvard Medical School, Boston, MA 02115 (United States); School of Clinical Sciences, Division of Gastroenterology, University of Liverpool, Liverpool L69 3GE (United Kingdom); Stearns, Adam T. [Department of Surgery, Brigham and Women' s Hospital, Boston, MA 02115 (United States); Department of Surgery, Harvard Medical School, Boston, MA 02115 (United States); Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 2JD (United Kingdom); Park, Peter J. [Department of Medicine, Brigham and Women' s Hospital, Boston, MA 02115 (United States); Harvard Medical School, Center for Biomedical Informatics, Boston, MA 02115 (United States); Dreyfuss, Jonathan M. [Department of Medicine, Brigham and Women' s Hospital, Boston, MA 02115 (United States); Ashley, Stanley W. [Department of Surgery, Brigham and Women' s Hospital, Boston, MA 02115 (United States); Department of Surgery, Harvard Medical School, Boston, MA 02115 (United States); Rhoads, David B. [Department of Surgery, Harvard Medical School, Boston, MA 02115 (United States); Pediatric Endocrine Unit, MassGeneral Hospital for Children, Boston, MA 02114 (United States); Tavakkolizadeh, Ali, E-mail: atavakkoli@partners.org [Department of Surgery, Brigham and Women' s Hospital, Boston, MA 02115 (United States); Department of Surgery, Harvard Medical School, Boston, MA 02115 (United States)

    2010-12-10

    Background and aims: The intestine exhibits profound diurnal rhythms in function and morphology, in part due to changes in enterocyte proliferation. The regulatory mechanisms behind these rhythms remain largely unknown. We hypothesized that microRNAs are involved in mediating these rhythms, and studied the role of microRNAs specifically in modulating intestinal proliferation. Methods: Diurnal rhythmicity of microRNAs in rat jejunum was analyzed by microarrays and validated by qPCR. Temporal expression of diurnally rhythmic mir-16 was further quantified in intestinal crypts, villi, and smooth muscle using laser capture microdissection and qPCR. Morphological changes in rat jejunum were assessed by histology and proliferation by immunostaining for bromodeoxyuridine. In IEC-6 cells stably overexpressing mir-16, proliferation was assessed by cell counting and MTS assay, cell cycle progression and apoptosis by flow cytometry, and cell cycle gene expression by qPCR and immunoblotting. Results: mir-16 peaked 6 hours after light onset (HALO 6) with diurnal changes restricted to crypts. Crypt depth and villus height peaked at HALO 13-14 in antiphase to mir-16. Overexpression of mir-16 in IEC-6 cells suppressed specific G1/S regulators (cyclins D1-3, cyclin E1 and cyclin-dependent kinase 6) and produced G1 arrest. Protein expression of these genes exhibited diurnal rhythmicity in rat jejunum, peaking between HALO 11 and 17 in antiphase to mir-16. Conclusions: This is the first report of circadian rhythmicity of specific microRNAs in rat jejunum. Our data provide a link between anti-proliferative mir-16 and the intestinal proliferation rhythm and point to mir-16 as an important regulator of proliferation in jejunal crypts. This function may be essential to match proliferation and absorptive capacity with nutrient availability.

  15. The p150 subunit of CAF-1 causes association of SUMO2/3 with the DNA replication foci

    Energy Technology Data Exchange (ETDEWEB)

    Uwada, Junsuke [Department of Biological Sciences, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555 (Japan); Global COE (Centers of Excellence) Program, Global Initiative Center for Pulsed Power Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555 (Japan); Tanaka, Niina; Yamaguchi, Yutaro; Uchimura, Yasuhiro [Department of Biological Sciences, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555 (Japan); Shibahara, Kei-ichi [Department of Integrated Genetics, National Institute of Genetics, Research Organization of Information and Systems, Mishima (Japan); Nakao, Mitsuyoshi [Department of Medical Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto (Japan); Saitoh, Hisato, E-mail: hisa@kumamoto-u.ac.jp [Department of Biological Sciences, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555 (Japan); Global COE (Centers of Excellence) Program, Global Initiative Center for Pulsed Power Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555 (Japan)

    2010-01-01

    The small ubiquitin-related modifier 2/3 (SUMO2/3) can be post-translationally conjugated to a wide variety of proteins constituting chromatin, the platform for genetic and epigenetic regulation. Nevertheless, it is unclear how SUMO2/3 and SUMO2/3-modified proteins are delivered to the chromatin fibers. Here we report that the largest subunit of chromatin assembly factor 1 (CAF-1), human p150, interacts directly and preferentially with SUMO2/3. Amino acid residue of 98-105 in p150 is essential and sufficient for SUMO2/3 interaction. p150-SUMO2/3 interaction coincided with regions that replicate chromatin fibers, because accumulation of the proliferating cell nuclear antigen (PCNA), and incorporation of bromodeoxyuridine (BrdU) were detected at foci co-localized with both p150 and SUMO2/3 during the S-phase in a cell line expressing epitope-tagged p150. Although inhibition of SUMO2/3 expression had only a small effect on p150 deposition on the replication sites, depletion of p150 led to delocalization of SUMO2/3 from the replication foci. Furthermore, p150 mutants deficient in SUMO2/3 interaction, caused a major reduction of SUMO2/3 at the replication foci. Thus, our findings suggest an expanded role of p150 as a SUMO2/3-interacting factor, and raise the intriguing possibility that p150 plays a role in promoting delivery of SUMO2/3 or SUMO2/3-modified proteins (or both) on chromatin fibers during replication.

  16. Productive infection of human neural progenitor cells by R5 tropic HIV-1: opiate co-exposure heightens infectivity and functional vulnerability

    Science.gov (United States)

    Balinang, Joyce M.; Masvekar, Ruturaj R.; Hauser, Kurt F.; Knapp, Pamela E.

    2017-01-01

    Objective HIV type-1 (HIV-1) causes a spectrum of central nervous system (CNS) complications; many are worsened by opiate co-exposure. Human neural progenitor cells (hNPCs) give rise to all CNS neurons and macroglia. We tested the hypothesis that hNPC maturation and fate are altered by HIV and opiates, contributing to HIV-1-related neuropathology. Reports of hNPC infection remain controversial. We rigorously examined this question, testing whether hNPC propagated infection and whether HIV affected hNPCs absent their infection. Design and methods Primary hNPCs were characterized over multiple passages. Following R5 HIV-1BaL exposure, p24, Nef, and tat assays monitored infection; a serial dilution approach tested infection transfer to naive hNPCs. Bromodeoxyuridine uptake, population doubling time, and immunostaining assessed proliferation and differentiation. Morphine co-exposure assessed opiate interactions. Supernatant from HIV-1BaL-infected PBMCs (HIVsup), HIV-1BaL, and ultraviolet light-inactivated HIVsup were compared to test effects of inflammatory milieu versus virus or infection per se. Results The hNPCs (CD4_/CD8_/Iba_/CXC3CL1_/CD11b_) were infectable and could transfer infection to naive hNPCs. Infection was partly blocked by maraviroc, implicating CCR5. HIVsup reduced hNPC proliferation and caused premature differentiation into neurons/astroglia. Effects on proliferation were due to soluble factors/viral proteins, not infection per se. Morphine co-exposure exacerbated certain functional consequences of HIVsup, and sustained the infection of hNPCs. Conclusion hNPCs can be infected and propagate virus in vitro. hNPCs or their progeny may represent an underappreciated viral reservoir. Factors from infected cells alter hNPC proliferation and neural cell maturation which likely compromises CNS structure and function. Morphine–HIV interactions may worsen dysfunction and sustain infection. PMID:28099189

  17. A medium-term gpt delta rat model as an in vivo system for analysis of renal carcinogenesis and the underlying mode of action.

    Science.gov (United States)

    Matsushita, Kohei; Ishii, Yuji; Takasu, Shinji; Kuroda, Ken; Kijima, Aki; Tsuchiya, Takuma; Kawaguchi, Hiroaki; Miyoshi, Noriaki; Nohmi, Takehiko; Ogawa, Kumiko; Nishikawa, Akiyoshi; Umemura, Takashi

    2015-01-01

    The kidney is a major target site of chemical carcinogenesis. However, a reliable in vivo assay for rapid identification of renal carcinogens has not been established. The purpose of this study was to develop a new medium-term gpt delta rat model (the GNP model) to facilitate identification of renal carcinogens. In this model, we carried out an in vivo mutation assay using unilaterally nephrectomized kidney tissue and a tumor-promoting assay using residual kidney tissue, with diethylnitrosamine (DEN) as the renal tumor initiator. To clarify the optimal time of DEN injection after nephrectomy, time-dependent changes in bromodeoxyuridine-labeling indices in the tubular epithelium of nephrectomized rats were examined. The optimal dose of DEN injection and sufficient duration of subsequent nitrilotriacetic acid treatment were determined for detection of renal preneoplastic lesions. The standard protocol for the GNP model was determined as follows. Six-week-old female gpt delta rats were treated with test chemicals for 4 weeks, followed by a 2-week washout period, and 40 mg/kg DEN was administered intraperitoneally to initiate renal carcinogenesis. Unilateral nephrectomy was performed 48 h before DEN injection, followed by gpt assays using excised kidney tissues. One week after DEN injection, rats were further exposed to test chemicals for 12 weeks, and histopathological analysis of renal preneoplastic lesions was performed as an indicator of tumor-promoting activity in residual kidney tissue. Validation studies using aristolochic acid, potassium dibasic phosphate, phenylbutazone, and d-limonene indicated the reliability of the GNP model for predicting renal carcinogens and the underlying mode of action.

  18. Investigation of three doses of oral insulin-like growth factor-I on jejunal lactase phlorizin hydrolase activity and gene expression and enterocyte proliferation and migration in piglets.

    Science.gov (United States)

    Houle, V M; Park, Y K; Laswell, S C; Freund, G G; Dudley, M A; Donovan, S M

    2000-10-01

    In a previous study, oral IGF-I at 65 nM increased lactase phlorizin hydrolase (LPH) activity and villus height in piglets, however, the mechanisms were unknown. Herein, the response to a range of doses of IGF-I was investigated and we hypothesized that LPH and villus height would respond to oral IGF-I in a dose-dependent manner. Two 14-d experiments were conducted using cesarean-derived piglets. In experiment 1, piglets (n = 28) were fed formula containing 0, 33, 65, or 131 nmol/L (0, 0.25, 0.5, or 1.0 mg/L) recombinant human IGF-I. In experiment 2, 5'-bromodeoxyuridine was administered to piglets fed formula alone (n = 4) or containing 131 nmol/L IGF-I (n = 4). IGF-I did not affect body weight gain or intestinal weight or length. Jejunal villus height and LPH activity were significantly greater in piglets fed 131 nmol IGF-I/L than control piglets. Villus height and lactase activity in piglets fed the 33 and 65 nmol/L IGF-I doses were similar and intermediate between control and 131 nmol IGF-I/L. Jejunal mRNA expression and LPH polypeptide abundance were investigated in piglets receiving 0 or 131 nmol/L IGF-I. Steady state LPH mRNA abundance was significantly higher (p < 0.05) in IGF-I-treated piglets. The relative abundance of proLPH(h) was not significantly increased (p = 0.06) by IGF-I treatment. Mucosal DNA content and DNA synthesis were greater in piglets receiving 131 nmol IGF-I/L than control, however, enterocyte migration and mucosal protein content were unaffected. Thus, oral IGF-I increased jejunal LPH activity and LPH mRNA abundance and stimulated intestinal cell hyperplasia in normal piglets.

  19. Desvenlafaxine may accelerate neuronal maturation in the dentate gyri of adult male rats.

    Directory of Open Access Journals (Sweden)

    Aditya Asokan

    Full Text Available Adult hippocampal neurogenesis has been linked to the effects of anti-depressant drugs on behavior in rodent models of depression. To explore this link further, we tested whether the serotonin-norepinephrine reuptake inhibitor (SNRI venlafaxine impacted adult hippocampal neurogenesis differently than its primary active SNRI metabolite desvenlafaxine. Adult male Long Evans rats (n = 5-6 per group were fed vehicle, venlafaxine (0.5 or 5 mg or desvenlafaxine (0.5 or 5 mg twice daily for 16 days. Beginning the third day of drug treatment, the rats were given a daily bromodeoxyuridine (BrdU; 50 mg/kg injection for 5 days to label dividing cells and then perfused 2 weeks after the first BrdU injection to confirm total new hippocampal cell numbers and their phenotypes. The high desvenlafaxine dose increased total new BrdU+ cell number and appeared to accelerate neuronal maturation because fewer BrdU+ cells expressed maturing neuronal phenotypes and more expressed mature neuronal phenotypes in the dentate gyri of these versus vehicle-treated rats. While net neurogenesis was not increased in the dentate gyri of rats treated with the high desvenlafaxine dose, significantly more mature neurons were detected. Our data expand the body of literature showing that antidepressants impact adult neurogenesis by stimulating NPC proliferation and perhaps the survival of neuronal progeny and by showing that a high dose of the SNRI antidepressant desvenlafaxine, but neither a high nor low venlafaxine dose, may also accelerate neuronal maturation in the adult rat hippocampus. These data support the hypothesis that hippocampal neurogenesis may indeed serve as a biomarker of depression and the effects of antidepressant treatment, and may be informative for developing novel fast-acting antidepressant strategies.

  20. Inhibition of JNK in synovium by treatment with golimumab in rheumatoid arthritis.

    Science.gov (United States)

    Kanbe, Katsuaki; Chiba, Junji; Nakamura, Atsushi

    2014-01-01

    The aim of this study was to investigate immunohistological changes in mitogen-activated protein kinases (MAPKs) in the synovium following treatment with golimumab, compared with methotrexate (MTX). We assessed synovial tissues for 13 different molecules to detect cytokine levels histologically from 10 methotrexate (MTX)-treated rheumatoid arthritis (RA) patients as controls and 10 golimumab plus MTX-treated RA patients. Synovium samples from both groups were assessed by hematoxylin and eosin (HE) staining and analyzed for expression of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), matrix metalloproteinase-3 (MMP-3), CD4 (T cells), CD8 (T cells), CD20 (B cells), CD68 (macrophages), receptor activator of nuclear (kappa) B ligand (RANKL), bromodeoxyuridine (BrdU), CD29 (β-1 integrin), phospho-p38 MAPK (Tyr180/Tyr182), phospho-p44/42 MAPK (ERK1/ERK2), and phospho-c-Jun N-terminal kinase (JNK), by an immunohistological examination. HE staining showed that there was a significant decrease in cell proliferation in the synovium in RA patients who received golimumab compared with the controls. TNF-α, IL-6, MMP3, BrdU, p38, and ERK were not seen at significant levels in either group. On the other hand, CD4, CD8, CD20, CD29, CD68, RANKL, and JNK were significantly decreased in the golimumab group compared with the control. Based on a histological analysis of the synovium, it appears that the efficacy of the treatment with golimumab may involve the inhibition of cell proliferation, with decreases in T cells, B cells, macrophages, β-1 integrin, RANKL, and JNK in the synovium, compared with MTX treatment, in RA.

  1. Cerebrolysin enhances neurogenesis in the ischemic brain and improves functional outcome after stroke.

    Science.gov (United States)

    Zhang, Chunling; Chopp, Michael; Cui, Yisheng; Wang, Lei; Zhang, Ruilan; Zhang, Li; Lu, Mei; Szalad, Alexandra; Doppler, Edith; Hitzl, Monika; Zhang, Zheng Gang

    2010-11-15

    Cerebrolysin is a peptide preparation mimicking the action of neurotrophic factors and has beneficial effects on neurodegenerative diseases and stroke. The present study investigated the effect of Cerebrolysin on neurogenesis in a rat model of embolic middle cerebral artery occlusion (MCAo). Treatment with Cerebrolysin at doses of 2.5 and 5 ml/kg significantly increased the number of bromodeoxyuridine-positive (BrdU(+)) subventricular zone (SVZ) neural progenitor cells and doublecortin (DCX) immunoreactivity (migrating neuroblasts) in the ipsilateral SVZ and striatal ischemic boundary 28 days after stroke when the treatment was initiated 24 hr after stroke. The treatment also reduced TUNEL(+) cells by ∼50% in the ischemic boundary. However, treatment with Cerebrolysin at a dose of 2.5 ml/kg initiated at 24 and 48 hr did not significantly reduce infarct volume but substantially improved neurological outcomes measured by an array of behavioral tests 21 and 28 days after stroke. Incubation of SVZ neural progenitor cells from ischemic rats with Cerebrolysin dose dependently augmented BrdU(+) cells and increased the number of Tuj1(+) cells (a marker of immature neurons). Blockage of the PI3K/Akt pathway abolished Cerebrolysin-increased BrdU(+) cells. Moreover, Cerebrolysin treatment promoted neural progenitor cell migration. Collectively, these data indicate that Cerebrolysin treatment when initiated 24 and 48 hr after stroke enhances neurogenesis in the ischemic brain and improves functional outcome and that Cerebrolysin-augmented proliferation, differentiation, and migration of adult SVZ neural progenitor cells contribute to Cerebrolysin-induced neurogenesis, which may be related to improvement of neurological outcome. The PI3K/Akt pathway mediates Cerebrolysin-induced progenitor cell proliferation.

  2. Neurogenesis response of middle-aged hippocampus to acute seizure activity.

    Directory of Open Access Journals (Sweden)

    Ashok K Shetty

    Full Text Available Acute Seizure (AS activity in young adult age conspicuously modifies hippocampal neurogenesis. This is epitomized by both increased addition of new neurons to the granule cell layer (GCL by neural stem/progenitor cells (NSCs in the dentate subgranular zone (SGZ, and greatly enhanced numbers of newly born neurons located abnormally in the dentate hilus (DH. Interestingly, AS activity in old age does not induce such changes in hippocampal neurogenesis. However, the effect of AS activity on neurogenesis in the middle-aged hippocampus is yet to be elucidated. We examined hippocampal neurogenesis in middle-aged F344 rats after a continuous AS activity for >4 hrs, induced through graded intraperitoneal injections of the kainic acid. We labeled newly born cells via daily intraperitoneal injections of the 5'-bromodeoxyuridine (BrdU for 12 days, commencing from the day of induction of AS activity. AS activity enhanced the addition of newly born BrdU+ cells by 5.6 fold and newly born neurons (expressing both BrdU and doublecortin [DCX] by 2.2 fold to the SGZ-GCL. Measurement of the total number of DCX+ newly born neurons also revealed a similar trend. Furthermore, AS activity increased DCX+ newly born neurons located ectopically in the DH (2.7 fold increase and 17% of total newly born neurons. This rate of ectopic migration is however considerably less than what was observed earlier for the young adult hippocampus after similar AS activity. Thus, the plasticity of hippocampal neurogenesis to AS activity in middle age is closer to its response observed in the young adult age. However, the extent of abnormal migration of newly born neurons into the DH is less than that of the young adult hippocampus after similar AS activity. These results also point out a highly divergent response of neurogenesis to AS activity between middle age and old age.

  3. Interaction Effect of Social Isolation and High Dose Corticosteroid on Neurogenesis and Emotional Behavior.

    Science.gov (United States)

    Chan, Jackie N-M; Lee, Jada C-D; Lee, Sylvia S P; Hui, Katy K Y; Chan, Alan H L; Fung, Timothy K-H; Sánchez-Vidaña, Dalinda I; Lau, Benson W-M; Ngai, Shirley P-C

    2017-01-01

    Hypercortisolemia is one of the clinical features found in depressed patients. This clinical feature has been mimicked in animal studies via application of exogenous corticosterone (CORT). Previous studies suggested that CORT can induce behavioral disturbance in anxious-depressive like behavior, which is associated with suppressed neurogenesis. Hippocampal neurogenesis plays an important role in adult cognitive and behavioral regulation. Its suppression may thus lead to neuropsychiatric disorders. Similar to the effects of CORT on the animals' depression-like behaviors and neurogenesis, social deprivation has been regarded as one factor that predicts poor prognosis in depression. Furthermore, social isolation is regarded as a stressor to social animals including experimental rodents. Hence, this study aims to examine if social isolation would induce further emotional or anxiety-like behavior disturbance and suppress neurogenesis in an experimental model that was repeatedly treated with CORT. Sprague-Dawley rats were used in this study to determine the effects of different housing conditions, either social isolated or group housing, in vehicle-treated control and CORT-treated animals. Forced swimming test (FST), open field test (OFT) and social interaction test (SIT) were used to assess depression-like, anxiety-like and social behaviors respectively. Immunohistochemistry was performed to quantify the number of proliferative cells and immature neurons in the hippocampus, while dendritic maturation of immature neurons was analyzed by Sholl analysis. Social isolation reduced latency to immobility in FST. Furthermore, social isolation could significantly reduce the ratio of doublecortin and bromodeoxyuridine (BrdU) positive cells of the neurogenesis assay under CORT-treated condition. The current findings suggested that the behavioral and neurological effect of social isolation is dependent on the condition of hypercortisolemia. Furthermore, social isolation may

  4. Thoracic rat spinal cord contusion injury induces remote spinal gliogenesis but not neurogenesis or gliogenesis in the brain.

    Directory of Open Access Journals (Sweden)

    Steffen Franz

    Full Text Available After spinal cord injury, transected axons fail to regenerate, yet significant, spontaneous functional improvement can be observed over time. Distinct central nervous system regions retain the capacity to generate new neurons and glia from an endogenous pool of progenitor cells and to compensate neural cell loss following certain lesions. The aim of the present study was to investigate whether endogenous cell replacement (neurogenesis or gliogenesis in the brain (subventricular zone, SVZ; corpus callosum, CC; hippocampus, HC; and motor cortex, MC or cervical spinal cord might represent a structural correlate for spontaneous locomotor recovery after a thoracic spinal cord injury. Adult Fischer 344 rats received severe contusion injuries (200 kDyn of the mid-thoracic spinal cord using an Infinite Horizon Impactor. Uninjured rats served as controls. From 4 to 14 days post-injury, both groups received injections of bromodeoxyuridine (BrdU to label dividing cells. Over the course of six weeks post-injury, spontaneous recovery of locomotor function occurred. Survival of newly generated cells was unaltered in the SVZ, HC, CC, and the MC. Neurogenesis, as determined by identification and quantification of doublecortin immunoreactive neuroblasts or BrdU/neuronal nuclear antigen double positive newly generated neurons, was not present in non-neurogenic regions (MC, CC, and cervical spinal cord and unaltered in neurogenic regions (dentate gyrus and SVZ of the brain. The lack of neuronal replacement in the brain and spinal cord after spinal cord injury precludes any relevance for spontaneous recovery of locomotor function. Gliogenesis was increased in the cervical spinal cord remote from the injury site, however, is unlikely to contribute to functional improvement.

  5. Allergy Enhances Neurogenesis and Modulates Microglial Activation in the Hippocampus

    Science.gov (United States)

    Klein, Barbara; Mrowetz, Heike; Thalhamer, Josef; Scheiblhofer, Sandra; Weiss, Richard; Aigner, Ludwig

    2016-01-01

    Allergies and their characteristic TH2-polarized inflammatory reactions affect a substantial part of the population. Since there is increasing evidence that the immune system modulates plasticity and function of the central nervous system (CNS), we investigated the effects of allergic lung inflammation on the hippocampus—a region of cellular plasticity in the adult brain. The focus of the present study was on microglia, the resident immune cells of the CNS, and on hippocampal neurogenesis, i.e., the generation of new neurons. C57BL/6 mice were sensitized with a clinically relevant allergen derived from timothy grass pollen (Phl p 5). As expected, allergic sensitization induced high serum levels of allergen-specific immunoglobulins (IgG1 and IgE) and of TH2 cytokines (IL-5 and IL-13). Surprisingly, fewer Iba1+ microglia were found in the granular layer (GL) and subgranular zone (SGZ) of the hippocampal dentate gyrus and also the number of Iba1+MHCII+ cells was lower, indicating a reduced microglial surveillance and activation in the hippocampus of allergic mice. Neurogenesis was analyzed by labeling of proliferating cells with bromodeoxyuridine (BrdU) and determining their fate 4 weeks later, and by quantitative analysis of young immature neurons, i.e., cells expressing doublecortin (DCX). The number of DCX+ cells was clearly increased in the allergy animals. Moreover, there were more BrdU+ cells present in the hippocampus of allergic mice, and these newly born cells had differentiated into neurons as indicated by a higher number of BrdU+NeuN+ cells. In summary, allergy led to a reduced microglia presence and activity and to an elevated level of neurogenesis in the hippocampus. This effect was apparently specific to the hippocampus, as we did not observe these alterations in the subventricular zone (SVZ)/olfactory bulb (OB) system, also a region of high cellular plasticity and adult neurogenesis. PMID:27445696

  6. The epidermal growth factor receptor decreases Stathmin 1 and triggers catagen entry in the mouse.

    Science.gov (United States)

    Bichsel, Kyle J; Hammiller, Brianna; Trempus, Carol S; Li, Yanhua; Hansen, Laura A

    2016-04-01

    The epidermal growth factor receptor (EGFR) is necessary for normal involution of hair follicles after the growth phase of anagen, although the mechanisms through which it acts are not well understood. In this report, we used transcriptional profiling of microdissected hair follicles from mice with skin-targeted deletion of Egfr to investigate how EGFR activation triggers catagen. Immunofluorescence for phospho-EGFR in mouse skin revealed increased activation of EGFR in follicular keratinocytes at catagen onset. Consistent with other models of EGFR deficiency, mice with skin-targeted deletion of Egfr (Krt14-Cre(+) /Egfr(fl/fl) ) exhibited a delayed and asynchronous catagen entry. Transcriptional profiling at the time of normal catagen onset at post-natal day (P) 17 revealed increased expression of the mitotic regulator Rcc2 in hair follicles lacking EGFR. Rcc2 protein was strongly immunopositive in the nuclei of control follicular keratinocytes at P16 then rapidly decreased until it was undetectable between P18 and 21. In contrast, Rcc2 expression continued in Egfr mutant follicles throughout this period. Proliferation, measured by bromodeoxyuridine incorporation, was also significantly increased in Egfr mutant follicular keratinocytes compared to controls at P18-21. Similarly, Rcc2-regulated mitotic regulator Stathmin 1 was strikingly reduced in control but not Egfr mutant follicles between P17 and P19. Deletion of Stmn1, in turn, accelerated catagen entry associated with premature cessation of proliferation in the hair follicles. These data reveal EGFR suppression of mitotic regulators including Rcc2 and Stathmin 1 as a mechanism for catagen induction in mouse skin.

  7. Agmatine increases proliferation of cultured hippocampal progenitor cells and hippocampal neurogenesis in chronically stressed mice

    Institute of Scientific and Technical Information of China (English)

    Yun-feng LI; Hong-xia CHEN; Ying LIU; You-zhi ZHANG; Yan-qin LIU; Jin LI

    2006-01-01

    Aim:To explore the mechanism of agmatine's antidepressant action.Methods: Male mice were subjected to a variety of unpredictable stressors on a daily basis over a 24-d period.The open-field behaviors of the mice were displayed and recorded using a Videomex-V image analytic system automatically.For bromodeoxyuridine (BrdU;thymidine analog as a marker for dividing cells) labeling,the mice were injected with BrdU (100 mg/kg,ip,twice per d for 2 d),and the hippocampal neurogenesis in stressed mice was measured by immunohistochemistry.The proliferation of cultured hippocampal progenitor cells from neonatal rats was determined by colorimetric assay (cell counting kit-8) and 3H-thymidine incorporation assay.Results:After the onset of chronic stress,the locomotor activity of the mice in the open field significantly decreased,while coadministration of agmatine 10 mg/kg (po) blocked it.Furthermore,the number of BrdU-labeled cells in the hippocampal dentate gyrus significantly decreased in chronically stressed mice, which was also blocked by chronic coadministration with agmatine 10 mg/kg (po). Four weeks after the BrdU injection, some of the new born cells matured and became neurons, as determined by double labeling for BrdU and neuron specific enolase (NSE), a marker for mature neurons.In vitro treatment with agmatine 0.1-10 μmo1/L for 3 d significantly increased the proliferation of the cultured hippocampal progenitor cells in a dose-dependent manner.Conclusion:We have found that agmatine increases proliferation of hippocampal progenitor cells in vitro and the hippocampal neurogenesis in vivo in chronically stressed mice.This may be one of the important mechanisms involved in agmatine's antidepressant action.

  8. Noggin and BMP4 co-modulate adult hippocampal neurogenesis in the APP{sub swe}/PS1{sub {Delta}E9} transgenic mouse model of Alzheimer's disease

    Energy Technology Data Exchange (ETDEWEB)

    Tang, Jun [Department of Medical Genetics, Third Military Medical University, Chongqing 400038 (China); Department of Physiology, Third Military Medical University, Chongqing 400038 (China); Song, Min; Wang, Yanyan [Department of Medical Genetics, Third Military Medical University, Chongqing 400038 (China); Fan, Xiaotang [Department of Histology and Embryology, Third Military Medical University, Chongqing 400038 (China); Xu, Haiwei, E-mail: haiweixu2001@yahoo.com.cn [Department of Physiology, Third Military Medical University, Chongqing 400038 (China); Bai, Yun, E-mail: baiyungene@gmail.com [Department of Medical Genetics, Third Military Medical University, Chongqing 400038 (China)

    2009-07-31

    In addition to the subventricular zone, the dentate gyrus of the hippocampus is one of the few brain regions in which neurogenesis continues into adulthood. Perturbation of neurogenesis can alter hippocampal function, and previous studies have shown that neurogenesis is dysregulated in Alzheimer disease (AD) brain. Bone morphogenetic protein-4 (BMP4) and its antagonist Noggin have been shown to play important roles both in embryonic development and in the adult nervous system, and may regulate hippocampal neurogenesis. Previous data indicated that increased expression of BMP4 mRNA within the dentate gyrus might contribute to decreased hippocampal cell proliferation in the APP{sub swe}/PS1{sub {Delta}E9} mouse AD model. However, it is not known whether the BMP antagonist Noggin contributes to the regulation of neurogenesis. We therefore studied the relative expression levels and localization of BMP4 and its antagonist Noggin in the dentate gyrus and whether these correlated with changes in neurogenesis in 6-12 mo old APP{sub swe}/PS1{sub {Delta}E9} transgenic mice. Bromodeoxyuridine (BrdU) was used to label proliferative cells. We report that decreased neurogenesis in the APP/PS1 transgenic mice was accompanied by increased expression of BMP4 and decreased expression of Noggin at both the mRNA and protein levels; statistical analysis showed that the number of proliferative cells at different ages correlated positively with Noggin expression and negatively with BMP4 expression. Intraventricular administration of a chimeric Noggin/Fc protein was used to block the action of endogenous BMP4; this resulted in a significant increase in the number of BrdU-labeled cells in dentate gyrus subgranular zone and hilus in APP/PS1 mice. These results suggest that BMP4 and Noggin co-modulate neurogenesis.

  9. Adult Human Pancreatic Islet Beta-Cells Display Limited Turnover and Long Lifespan as Determined by In-Vivo Thymidine Analog Incorporation and Radiocarbon Dating

    Energy Technology Data Exchange (ETDEWEB)

    Perl, S; Kushner, J A; Buchholz, B A; Meeker, A K; Stein, G M; Hsieh, M; Kirby, M; Pechhold, S; Liu, E H; Harlan, D M; Tisdale, J F

    2010-03-15

    Diabetes mellitus results from an absolute or relative deficiency of insulin producing pancreatic beta-cells. The adult human beta-cell's turnover rate remains unknown. We employed novel techniques to examine adult human islet beta-cell turnover and longevity in vivo. Subjects enrolled in NIH clinical trials received thymidine analogues [iododeoxyuridine (IdU) or bromodeoxyuridine (BrdU)] 8-days to 4-years prior to death. Archival autopsy samples from ten patients (aged 17-74 years) were employed to assess beta-cell turnover by scoring nuclear analog labeling within insulin staining cells. Human adult beta-cell longevity was determined by estimating the cells genomic DNA integration of atmospheric carbon-14 ({sup 14}C). DNA was purified from pancreatic islets isolated from cadaveric donors; whole islet prep DNA was obtained from a 15 year old donor, and purified beta-cell DNA was obtained from two donors (age 48 and 80 years). {sup 14}C levels were then determined using accelerator mass spectrometry (AMS). Cellular 'birth date' was determined by comparing the subject's DNA {sup 14}C content relative to a well-established {sup 14}C atmospheric prevalence curve. In the two subjects less than age 20 years, 1-2% of the beta-cell nuclei co-stained for BrdU/IdU. No beta-cell nuclei co-stained in the eight patients more than 30 years old. Consistent with the BrdU/IdU turnover data, beta-cell DNA {sup 14}C content indicated the cells 'birth date' occurred within the subject's first 30 years of life. Under typical circumstances, adult human beta-cells and their cellular precursors are established by young adulthood.

  10. Chromatin regulator PRC2 is a key regulator of epigenetic plasticity in glioblastoma.

    Science.gov (United States)

    Natsume, Atsushi; Ito, Motokazu; Katsushima, Keisuke; Ohka, Fumiharu; Hatanaka, Akira; Shinjo, Keiko; Sato, Shinya; Takahashi, Satoru; Ishikawa, Yuta; Takeuchi, Ichiro; Shimogawa, Hiroki; Uesugi, Motonari; Okano, Hideyuki; Kim, Seung U; Wakabayashi, Toshihiko; Issa, Jean-Pierre J; Sekido, Yoshitaka; Kondo, Yutaka

    2013-07-15

    Tumor cell plasticity contributes to functional and morphologic heterogeneity. To uncover the underlying mechanisms of this plasticity, we examined glioma stem-like cells (GSC) where we found that the biologic interconversion between GSCs and differentiated non-GSCs is functionally plastic and accompanied by gain or loss of polycomb repressive complex 2 (PRC2), a complex that modifies chromatin structure. PRC2 mediates lysine 27 trimethylation on histone H3 and in GSC it affected pluripotency or development-associated genes (e.g., Nanog, Wnt1, and BMP5) together with alterations in the subcellular localization of EZH2, a catalytic component of PRC2. Intriguingly, exogenous expression of EZH2-dNLS, which lacks nuclear localization sequence, impaired the repression of Nanog expression under differentiation conditions. RNA interference (RNAi)-mediated attenuation or pharmacologic inhibition of EZH2 had little to no effect on apoptosis or bromodeoxyuridine incorporation in GSCs, but it disrupted morphologic interconversion and impaired GSC integration into the brain tissue, thereby improving survival of GSC-bearing mice. Pathologic analysis of human glioma specimens revealed that the number of tumor cells with nuclear EZH2 is larger around tumor vessels and the invasive front, suggesting that nuclear EZH2 may help reprogram tumor cells in close proximity to this microenvironment. Our results indicate that epigenetic regulation by PRC2 is a key mediator of tumor cell plasticity, which is required for the adaptation of glioblastoma cells to their microenvironment. Thus, PRC2-targeted therapy may reduce tumor cell plasticity and tumor heterogeneity, offering a new paradigm for glioma treatment.

  11. Cytotoxic effects of curcumin in human retinal pigment epithelial cells.

    Directory of Open Access Journals (Sweden)

    Margrit Hollborn

    Full Text Available BACKGROUND: Curcumin from turmeric is an ingredient in curry powders. Due to its antiinflammatory, antioxidant and anticarcinogenic effects, curcumin is a promising drug for the treatment of cancer and retinal diseases. We investigated whether curcumin alters the viability and physiological properties of human retinal pigment epithelial (RPE cells in vitro. METHODOLOGY/PRINCIPAL FINDINGS: Cellular proliferation was investigated with a bromodeoxy-uridine immunoassay, and chemotaxis was investigated with a Boyden chamber assay. Cell viability was determined by trypan blue exclusion. Apoptosis and necrosis rates were determined with a DNA fragmentation ELISA. Gene expression was determined by real-time PCR, and secretion of VEGF and bFGF was examined with ELISA. The phosphorylation level of proteins was revealed by Western blotting. The proliferation of RPE cells was slightly increased by curcumin at 10 µM and strongly reduced by curcumin above 50 µM. Curcumin at 50 µM increased slightly the chemotaxis of the cells. Curcumin reduced the expression and secretion of VEGF under control conditions and abolished the VEGF secretion induced by PDGF and chemical hypoxia. Whereas low concentrations of curcumin stimulated the expression of bFGF and HGF, high concentrations caused downregulation of both factors. Curcumin decreased dose-dependently the viability of RPE cells via induction of early necrosis (above 10 µM and delayed apoptosis (above 1 µM. The cytotoxic effect of curcumin involved activation of caspase-3 and calpain, intracellular calcium signaling, mitochondrial permeability, oxidative stress, increased phosphorylation of p38 MAPK and decreased phosphorylation of Akt protein. CONCLUSION: It is concluded that curcumin at concentrations described to be effective in the treatment of tumor cells and in inhibiting death of retinal neurons (∼10 µM has adverse effects on RPE cells. It is suggested that, during the intake of curcumin as

  12. Cytotoxic Effects of Curcumin in Human Retinal Pigment Epithelial Cells

    Science.gov (United States)

    Hollborn, Margrit; Chen, Rui; Wiedemann, Peter; Reichenbach, Andreas; Bringmann, Andreas; Kohen, Leon

    2013-01-01

    Backround Curcumin from turmeric is an ingredient in curry powders. Due to its antiinflammatory, antioxidant and anticarcinogenic effects, curcumin is a promising drug for the treatment of cancer and retinal diseases. We investigated whether curcumin alters the viability and physiological properties of human retinal pigment epithelial (RPE) cells in vitro. Methodology/Principal Findings Cellular proliferation was investigated with a bromodeoxy-uridine immunoassay, and chemotaxis was investigated with a Boyden chamber assay. Cell viability was determined by trypan blue exclusion. Apoptosis and necrosis rates were determined with a DNA fragmentation ELISA. Gene expression was determined by real-time PCR, and secretion of VEGF and bFGF was examined with ELISA. The phosphorylation level of proteins was revealed by Western blotting. The proliferation of RPE cells was slightly increased by curcumin at 10 µM and strongly reduced by curcumin above 50 µM. Curcumin at 50 µM increased slightly the chemotaxis of the cells. Curcumin reduced the expression and secretion of VEGF under control conditions and abolished the VEGF secretion induced by PDGF and chemical hypoxia. Whereas low concentrations of curcumin stimulated the expression of bFGF and HGF, high concentrations caused downregulation of both factors. Curcumin decreased dose-dependently the viability of RPE cells via induction of early necrosis (above 10 µM) and delayed apoptosis (above 1 µM). The cytotoxic effect of curcumin involved activation of caspase-3 and calpain, intracellular calcium signaling, mitochondrial permeability, oxidative stress, increased phosphorylation of p38 MAPK and decreased phosphorylation of Akt protein. Conclusion It is concluded that curcumin at concentrations described to be effective in the treatment of tumor cells and in inhibiting death of retinal neurons (∼10 µM) has adverse effects on RPE cells. It is suggested that, during the intake of curcumin as concomitant therapy of

  13. Spatial distribution of prominin-1 (CD133-positive cells within germinative zones of the vertebrate brain.

    Directory of Open Access Journals (Sweden)

    József Jászai

    Full Text Available BACKGROUND: In mammals, embryonic neural progenitors as well as adult neural stem cells can be prospectively isolated based on the cell surface expression of prominin-1 (CD133, a plasma membrane glycoprotein. In contrast, characterization of neural progenitors in non-mammalian vertebrates endowed with significant constitutive neurogenesis and inherent self-repair ability is hampered by the lack of suitable cell surface markers. Here, we have investigated whether prominin-1-orthologues of the major non-mammalian vertebrate model organisms show any degree of conservation as for their association with neurogenic geminative zones within the central nervous system (CNS as they do in mammals or associated with activated neural progenitors during provoked neurogenesis in the regenerating CNS. METHODS: We have recently identified prominin-1 orthologues from zebrafish, axolotl and chicken. The spatial distribution of prominin-1-positive cells--in comparison to those of mice--was mapped in the intact brain in these organisms by non-radioactive in situ hybridization combined with detection of proliferating neural progenitors, marked either by proliferating cell nuclear antigen or 5-bromo-deoxyuridine. Furthermore, distribution of prominin-1 transcripts was investigated in the regenerating spinal cord of injured axolotl. RESULTS: Remarkably, a conserved association of prominin-1 with germinative zones of the CNS was uncovered as manifested in a significant co-localization with cell proliferation markers during normal constitutive neurogenesis in all species investigated. Moreover, an enhanced expression of prominin-1 became evident associated with provoked, compensatory neurogenesis during the epimorphic regeneration of the axolotl spinal cord. Interestingly, significant prominin-1-expressing cell populations were also detected at distinct extraventricular (parenchymal locations in the CNS of all vertebrate species being suggestive of further, non

  14. Effect of midazolam on the proliferation of neural stem cells isolated from rat hippocampus

    Institute of Scientific and Technical Information of China (English)

    Sanjun Zhao; Yajing Zhu; Rui Xue; Yunfeng Li; Hui Lu; Weidong Mi

    2012-01-01

    In many recent studies,the inhibitory transmitter gamma-aminobutyric acid has been shown to modulate the proliferation,differentiation and survival of neural stem cells.Most general anesthetics are partial or allosteric gamma-aminobutyric acid A receptor agonists,suggesting that general anesthetics could alter the behavior of neural stem cells.The neuroprotective efficacy of general anesthetics has been recognized for decades,but their effects on the proliferation of neural stem cells have received little attention.This study investigated the potential effect of midazolam,an extensively used general anesthetic and allosteric gamma-aminobutyric acid A receptor agonist,on the proliferation of neural stem cells in vitro and preliminarily explored the underlying mechanism.The proliferation of neural stem cells was tested using both Cell Counting Kit 8 and bromodeoxyuridine incorporation experiments.Cell distribution analysis was performed to describe changes in the cell cycle distribution in response to midazolam.Calcium imaging was employed to explore the molecular signaling pathways activated by midazolam.Midazolam (30-90 μM) decreased the proliferation of neural stem cells in vitro.Pretreatment with the gamma-aminobutyric acid A receptor antagonist bicuculline or Na-K-2Cl cotransport inhibitor furosemide partially rescued this inhibition.In addition,midazolam triggered a calcium influx into neural stem cells.The suppressive effect of midazolam on the proliferation of neural stem cells can be partly attributed to the activation of gamma-aminobutyric acid A receptor.The calcium influx triggered by midazolam may be a trigger factor leading to further downstream events.

  15. Asiatic Acid Prevents the Deleterious Effects of Valproic Acid on Cognition and Hippocampal Cell Proliferation and Survival

    Directory of Open Access Journals (Sweden)

    Jariya Umka Welbat

    2016-05-01

    Full Text Available Valproic acid (VPA is commonly prescribed as an anticonvulsant and mood stabilizer used in the treatment of epilepsy and bipolar disorder. A recent study has demonstrated that VPA reduces histone deacetylase (HDAC activity, an action which is believed to contribute to the effects of VPA on neural stem cell proliferation and differentiation which may explain the cognitive impairments produced in rodents and patients. Asiatic acid is a triterpenoid derived from the medicinal plant Centella asiatica. Our previous study has shown that Asiatic acid improves working spatial memory and increases cell proliferation in the sub granular zone of the hippocampal dentate gyrus. In the present study we investigate the effects of Asiatic acid in preventing the memory and cellular effects of VPA. Male Spraque-Dawley rats were orally administered Asiatic acid (30 mg/kg/day for 28 days, while VPA-treated animals received injections of VPA (300 mg/kg twice a day from Day 15 to Day 28 for 14 days. Spatial memory was determined using the novel object location (NOL test and hippocampal cell proliferation and survival was quantified by immuostaining for Ki-67 and Bromodeoxyuridine (BrdU, respectively. The results showed that VPA-treated animals were unable to discriminate between objects in familiar and novel locations. Moreover, VPA significantly reduced numbers of Ki-67 and BrdU positive cells. These results indicate that VPA treatment caused impairments of spatial working memory, cell proliferation and survival in the subgranular zone (SGZ of the hippocampal dentate gyrus (DG. However, these abnormalities were restored to control levels by co-treatment with Asiatic acid. These data demonstrate that Asiatic acid could prevent the spatial memory and neurogenesis impairments caused by VPA.

  16. Short term morphine exposure in vitro alters proliferation and differentiation of neural progenitor cells and promotes apoptosis via mu receptors.

    Directory of Open Access Journals (Sweden)

    Dafna Willner

    Full Text Available Chronic morphine treatment inhibits neural progenitor cell (NPC progression and negatively effects hippocampal neurogenesis. However, the effect of acute opioid treatment on cell development and its influence on NPC differentiation and proliferation in vitro is unknown. We aim to investigate the effect of a single, short term exposure of morphine on the proliferation, differentiation and apoptosis of NPCs and the mechanism involved.Cell cultures from 14-day mouse embryos were exposed to different concentrations of morphine and its antagonist naloxone for 24 hours and proliferation, differentiation and apoptosis were studied. Proliferating cells were labeled with bromodeoxyuridine (BrdU and cell fate was studied with immunocytochemistry.Cells treated with morphine demonstrated decreased BrdU expression with increased morphine concentrations. Analysis of double-labeled cells showed a decrease in cells co-stained for BrdU with nestin and an increase in cells co-stained with BrdU and neuron-specific class III β-tubuline (TUJ1 in a dose dependent manner. Furthermore, a significant increase in caspase-3 activity was observed in the nestin- positive cells. Addition of naloxone to morphine-treated NPCs reversed the anti-proliferative and pro-apoptotic effects of morphine.Short term morphine exposure induced inhibition of NPC proliferation and increased active caspase-3 expression in a dose dependent manner. Morphine induces neuronal and glial differentiation and decreases the expression of nestin- positive cells. These effects were reversed with the addition of the opioid antagonist naloxone. Our results demonstrate the effects of short term morphine administration on the proliferation and differentiation of NPCs and imply a mu-receptor mechanism in the regulation of NPC survival.

  17. In vitro exposure of human fibroblasts to local anaesthetics impairs cell growth

    Science.gov (United States)

    Fedder, C; Beck-Schimmer, B; Aguirre, J; Hasler, M; Roth-Z'graggen, B; Urner, M; Kalberer, S; Schlicker, A; Votta-Velis, G; Bonvini, J M; Graetz, K; Borgeat, A

    2010-01-01

    Lidocaine, bupivacaine or ropivacaine are used routinely to manage perioperative pain. Sparse data exist evaluating the effects of local anaesthetics (LA) on fibroblasts, which are involved actively in wound healing. Therefore, we investigated the effects of the three LA to assess the survival, viability and proliferation rate of fibroblasts. Human fibroblasts were exposed to 0·3 mg/ml and 0·6 mg/ml of each LA for 2 days, followed by incubation with normal medium for another 1, 4 or 7 days (group 1). Alternatively, cells were incubated permanently with LA for 3, 6 or 9 days (group 2). Live cell count was assessed using trypan blue staining. Viability was measured by the tetrazolium bromide assay. Proliferation tests were performed with the help of the colorimetric bromodeoxyuridine assay. Production of reactive oxygen species (ROS) was determined, measuring the oxidation of non-fluorescent-2,7′-dichlorofluorescin. Treatment of cells with the three LA showed a concentration-dependent decrease of live cells, mitochondrial activity and proliferation rate. Group arrangement played a significant role for cell count and proliferation, while exposure time influenced viability. Among the analysed LA, bupivacaine showed the most severe cytotoxic effects. Increased production of ROS correlated with decreased viability of fibroblasts in lidocaine- and bupivacaine-exposed cells, but not upon stimulation with ropivacaine. This study shows a concentration-dependent cytotoxic effect of lidocaine, bupivacaine and ropivacaine on fibroblasts in vitro, with more pronounced effects after continuous incubation. A possible mechanism of cell impairment could be triggered by production of ROS upon stimulation with lidocaine and bupivacaine. PMID:20819090

  18. Thymidine kinase gene mutation leads to reduced virulence of pseudorabies virus

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    To explore correlation between the tk gene structure of pseudorabies virus (PRV) and its virulence, to study the effect of the gene mutation on PRV biological properties, and to investigate mechinism of reduced virulence, thymidine kinase (TK)-deficient mutant of pseudorabies virus strain Hubei (PRV HB) was isolated by selection for resistance to 5-bromodeoxyuridine. The tk genes of PRV HB and its TK― mutant were cloned and sequenced. 1587 base pairs of the tk gene and flanking regions of wild-type (wt) virus were sequenced, which included an open reading frame (ORF) of 1098 bp encoding a protein of 366 amino acids. The ORF contained two 137-bp repeated sequences, which were connected by an adenosine. 1458 bp of the tk and flanking regions of TK― mutant were sequenced. Analysis of the tk gene sequence of TK― mutant indicated that one of 137 bp repeated sequence and the connecting adenosine in the tk gene of the wt virus was deleted and a repeated sequence of 8 nucleotides (GCGCGCC) was inserted. All other nucleotides of TK―mutant were identical to that of wt virus. Deletion and insertion of the nucleotide sequence resulted in a frameshift and a premature chain termination, and the resultant TK protein was not active. Analysis of the amino acid sequence revealed that TK protein of PRV HB contained the conserved consensus sequence of herpesviral TKs and an additional conserved-DHR-motif. The results of this work also indicated that TK― mutant was genetically stable. Compared to PRV HB, virulence of TK― mutant was greatly decreased. Mice vaccinated with TK― mutant were completely protected against a lethal challenge with virulent PRV (HB).

  19. The naturally occurring steroid solasodine induces neurogenesis in vitro and in vivo.

    Science.gov (United States)

    Lecanu, L; Hashim, A I; McCourty, A; Giscos-Douriez, I; Dinca, I; Yao, W; Vicini, S; Szabo, G; Erdélyi, F; Greeson, J; Papadopoulos, V

    2011-06-02

    In this study, we explored the capacity of the naturally occurring compound solasodine to promote neurogenesis in vitro and in vivo. Mouse embryonic teratocarcinoma P19 cells exposed to solasodine for 2 days followed by a 5-day washout differentiated into cholinergic neurons that expressed specific neuronal markers and displayed important axonal formation that continued growing even 30 days after treatment. In vivo, a 2-week infusion of solasodine into the left ventricle of the rat brain followed by a 3-week washout resulted in a significant increase in bromodeoxyuridine uptake by cells of the ependymal layer, subventricular zone, and cortex that co-localized with doublecortin immunostaining, demonstrating the proliferative and differentiating properties of solasodine on neuronal progenitors. In addition, these data demonstrate that under our experimental conditions adult ependymal cells retrieved their proliferative and differentiating abilities. The GAP-43/HuD pathway was activated both in vitro and in vivo, suggesting a role in the differentiating process triggered by solasodine. Solasodine treatment in rats resulted in a dramatic increase in expression of the cholesterol- and drug-binding translocator protein in ependymal cells, suggesting a possible role played by neurosteroid production in solasodine-induced neurogenesis. In GAD65-GFP mice that express the green fluorescent protein under the control of the glutamic acid decarboxylase 65-kDa promoter, solasodine treatment increased the number of GABAergic progenitors and neuroblasts generated in the subventricular zone and present in the olfactory migratory tract. Taken together, these results suggest that solasodine offers an interesting approach to stimulate in situ neurogenesis from resident neuronal progenitors as part of neuron replacement therapy.

  20. Vascular endothelial growth factor-dependent angiogenesis and dynamic vascular plasticity in the sensory circumventricular organs of adult mouse brain.

    Science.gov (United States)

    Morita, Shoko; Furube, Eriko; Mannari, Tetsuya; Okuda, Hiroaki; Tatsumi, Kouko; Wanaka, Akio; Miyata, Seiji

    2015-03-01

    The sensory circumventricular organs (CVOs), which comprise the organum vasculosum of the lamina terminalis (OVLT), the subfornical organ (SFO) and the area postrema (AP), lack a typical blood-brain barrier (BBB) and monitor directly blood-derived information to regulate body fluid homeostasis, inflammation, feeding and vomiting. Until now, almost nothing has been documented about vascular features of the sensory CVOs except fenestration of vascular endothelial cells. We therefore examine whether continuous angiogenesis occurs in the sensory CVOs of adult mouse. The angiogenesis-inducing factor vascular endothelial growth factor-A (VEGF-A) and the VEGF-A-regulating transcription factor hypoxia-inducible factor-1α were highly expressed in neurons of the OVLT and SFO and in both neurons and astrocytes of the AP. Expression of the pericyte-regulating factor platelet-derived growth factor B was high in astrocytes of the sensory CVOs. Immunohistochemistry of bromodeoxyuridine and Ki-67, a nuclear protein that is associated with cellular proliferation, revealed active proliferation of endothelial cells. Moreover, immunohistochemistry of caspase-3 and the basement membrane marker laminin showed the presence of apoptosis and sprouting of endothelial cells, respectively. Treatment with the VEGF receptor-associated tyrosine kinase inhibitor AZD2171 significantly reduced proliferation and filopodia sprouting of endothelial cells, as well as the area and diameter of microvessels. The mitotic inhibitor cytosine-b-D-arabinofuranoside reduced proliferation of endothelial cells and the vascular permeability of blood-derived low-molecular-weight molecules without changing vascular area and microvessel diameter. Thus, our data indicate that continuous angiogenesis is dependent on VEGF signaling and responsible for the dynamic plasticity of vascular structure and permeability.

  1. Transrepression function of the glucocorticoid receptor regulates eyelid development and keratinocyte proliferation but is not sufficient to prevent skin chronic inflammation.

    Science.gov (United States)

    Donet, Eva; Bosch, Pilar; Sanchis, Ana; Bayo, Pilar; Ramírez, Angel; Cascallana, José L; Bravo, Ana; Pérez, Paloma

    2008-04-01

    Glucocorticoids (GCs) play a key role in skin homeostasis and stress responses acting through the GC receptor (GR), which modulates gene expression by DNA binding-dependent (transactivation) and -independent (transrepression) mechanisms. To delineate which mechanisms underlie the beneficial and adverse effects mediated by GR in epidermis and other epithelia, we have generated transgenic mice that express a mutant GR (P493R, A494S), which is defective for transactivation but retains transrepression activity, under control of the keratin 5 promoter (K5-GR-TR mice). K5-GR-TR embryos exhibited eyelid opening at birth and corneal defects that resulted in corneal opacity in the adulthood. Transgenic embryos developed normal skin, although epidermal atrophy and focal alopecia was detected in adult mice. GR-mediated transrepression was sufficient to inhibit keratinocyte proliferation induced by acute and chronic phorbol 12-myristate 13-acetate exposure, as demonstrated by morphometric analyses, bromodeoxyuridine incorporation, and repression of keratin 6, a marker of hyperproliferative epidermis. These antiproliferative effects were mediated through negative interference of GR with MAPK/activator protein-1 and nuclear factor-kappaB activities, although these interactions occurred with different kinetics. However, phorbol 12-myristate 13-acetate-induced inflammation was only partially inhibited by GR-TR, which efficiently repressed IL-1beta and MMP-3 genes while weakly repressing IL-6 and TNF-alpha. Our data highlight the relevance of deciphering the mechanisms underlying GR actions on epithelial morphogenesis as well as for its therapeutic use to identify more restricted targets of GC administration.

  2. Short-term sleep deprivation stimulates hippocampal neurogenesis in rats following global cerebral ischemia/reperfusion.

    Directory of Open Access Journals (Sweden)

    Oumei Cheng

    Full Text Available Sleep deprivation (SD plays a complex role in central nervous system (CNS diseases. Recent studies indicate that short-term SD can affect the extent of ischemic damage. The aim of this study was to investigate whether short-term SD could stimulate hippocampal neurogenesis in a rat model of global cerebral ischemia/reperfusion (GCIR.One hundred Sprague-Dawley rats were randomly divided into Sham, GCIR and short-term SD groups based on different durations of SD; the short-term SD group was randomly divided into three subgroups: the GCIR+6hSD*3d-treated, GCIR+12hSD-treated and GCIR+12hSD*3d-treated groups. The GCIR rat model was induced via the bilateral occlusion of the common carotid arteries and hemorrhagic hypotension. The rats were sleep-deprived starting at 48 h following GCIR. A Morris water maze test was used to assess learning and memory ability; cell proliferation and differentiation were analyzed via 5-bromodeoxyuridine (BrdU and neuron-specific enolase (NSE, respectively, at 14 and 28 d; the expression of hippocampal BDNF was measured after 7 d.The different durations of short-term SD designed in our experiment exhibited improvement in cognitive function as well as increased hippocampal BDNF expression. Additionally, the short-term SD groups also showed an increased number of BrdU- and BrdU/NSE-positive cells compared with the GCIR group. Of the three short-term SD groups, the GCIR+12hSD*3d-treated group experienced the most substantial beneficial effects.Short-term SD, especially the GCIR+12hSD*3d-treated method, stimulates neurogenesis in the hippocampal dentate gyrus (DG of rats that undergo GCIR, and BDNF may be an underlying mechanism in this process.

  3. Heparanase enhances early hepatocyte inclusion in the recipient liver after transplantation in partially hepatectomized rats.

    Science.gov (United States)

    Tsiperson, Vladislav; Goldshmidt, Orit; Ilan, Neta; Shoshany, Gideon; Vlodavsky, Israel; Veitsman, Ella; Baruch, Yaacov

    2008-03-01

    Hepatocyte transplantation is an emerging approach for the treatment of liver diseases. However, broad clinical application of this method has been limited by restricted source of cells and low efficiency of cell integration within the recipient liver. Heparanase cleaves heparan sulfate proteoglycans in the extracellular matrix and basement membrane, activity that affects cellular invasion associated with cancer metastasis and inflammation. This activity has a multifunctional effect on cell-cell interaction, cell adhesion, and angiogenesis. All these factors are important for successful integration of transplanted hepatocytes. Male donor hepatocytes pretreated with heparanase or untreated were transplanted into recipient female rat spleen following partial hepatectomy. Engraftment efficacy was evaluated by PCR for Y chromosome, histology and PCNA, and heparanase immunohistochemistry. In addition, proliferative activity of hepatocytes in vitro was determined by bromodeoxyuridine immunostaining. The number of heparanase-treated cells detected in the recipient liver was significantly increased three- to fivefold within 24-48 h posttransplantation and twofold at 14 days compared with untreated cells. The transplanted hepatocytes treated with heparanase were clearly seen inside portal vein radicles as cell aggregates up to 72 h posttransplantation. The number of portal radicles filled with heparanase-treated hepatocytes was increased compared to control early after transplantation. Heparanase treatment enhanced hepatocyte and sinusoidal endothelial cell proliferation in the liver, and hepatocyte proliferation within the spleen tissue. Preliminary in vitro studies with isolated hepatocytes treated with heparanase showed increased proliferative activity within 24-48 h of cell culture. These results suggest that preincubation of hepatocytes with heparanase increases the presence of hepatocytes within the recipient liver early following cell transplantation and stimulates

  4. Passive avoidance training enhances cell proliferation in 1-day-old chicks.

    Science.gov (United States)

    Dermon, C R; Zikopoulos, B; Panagis, L; Harrison, E; Lancashire, C L; Mileusnic, R; Stewart, M G

    2002-10-01

    One-day-old domestic chicks were injected i.p. with bromodeoxyuridine (BrdU) before training on a one-trial passive avoidance task where the aversive experience was a bead coated with a bitter tasting substance, methyl anthranilate (MeA). Animals were tested 24 h later; those avoiding (if MeA-trained) or pecking if water (W)-trained (which they peck appetitively), along with a group of untrained naïve chicks, were used to determine cell proliferation either 24 h or 9 days post BrdU injection. In all three groups, BrdU positive cells were identified sparsely throughout the forebrain but labelling was pronounced around ventricular zone (VZ) surfaces at both 24 h and 9 days post-BrdU-injection. Double immunolabelling with neuronal specific antibodies, to either NeuN, or beta-tubulin III, confirmed that most BrdU labelled cells appeared to be neurons. Unbiased stereological analysis of labelled cells in selected forebrain areas 24 h post BrdU injection showed a significant MeA-training induced increase in labelled cells in both the dorsal VZ surface bordering the intermediate and medial hyperstriatum ventrale (IMHV) and the tuberculum olfactorium (TO). By 9 days post-BrdU-injection, there was a significantly greater number of BrdU labelled cells in MeA-trained birds within the IMHV, lobus parolfactorius (LPO) and TO. These results demonstrate that avoidance training in 1-day-old chicks has a marked effect on cell proliferation, in the LPO and IMHV, regions of the chick previously identified as a key loci of memory formation, and in a second region (TO), which has olfactory functions, but has not been previously investigated in relation to avoidance learning.

  5. Polysaccharopeptides derived from Coriolus versicolor potentiate the S-phase specific cytotoxicity of Camptothecin (CPT on human leukemia HL-60 cells

    Directory of Open Access Journals (Sweden)

    Jiang Pingping

    2010-04-01

    Full Text Available Abstract Background Polysaccharopeptide (PSP from Coriolus versicolor (Yunzhi is used as a supplementary cancer treatment in Asia. The present study aims to investigate whether PSP pre-treatment can increase the response of the human leukemia HL-60 cells to apoptosis induction by Camptothecin (CPT. Methods We used bivariate bromodeoxyuridine/propidium iodide (BrdUrd/PI flow cytometry analysis to measure the relative movement (RM of the BrdUrd positively labeled cells and DNA synthesis time (Ts on the HL-60 cell line. We used annexin V/PI flow cytometry analysis to quantify the viable, necrotic and apoptotic cells. The expression of cyclin E and cyclin B1 was determined with annexin V/PI flow cytometry and western blotting. Human peripheral blood mononuclear cells were used to test the cytotoxicity of PSP and CPT. Results PSP reduced cellular proliferation; inhibited cells progression through both S and G2 phase, reduced 3H-thymidine uptake and prolonged DNA synthesis time (Ts in HL-60 cells. PSP-pretreated cells enhanced the cytotoxicity of CPT. The sensitivity of cells to the cytotoxic effects of CPT was seen to be the highest in the S-phase and to a small extent of the G2 phase of the cell cycle. On the other hand, no cell death (measured by annexin V/PI was evident with the normal human peripheral blood mononuclear cells with treatment of either PSP or CPT. Conclusion The present study shows that PSP increases the sensitization of the HL-60 cells to undergo effective apoptotic cell death induced by CPT. The pattern of sensitivity of cancer cells is similar to that of HL-60 cells. PSP rapidly arrests and/or kills cells in S-phase and did not interfere with the anticancer action of CPT. PSP is a potential adjuvant to treat human leukemia as rapidly proliferating tumors is characterized by a high proportion of S-phase cells.

  6. Comparison of pleural responses of rats and hamsters to subchronic inhalation of refractory ceramic fibers.

    Science.gov (United States)

    Everitt, J I; Gelzleichter, T R; Bermudez, E; Mangum, J B; Wong, B A; Janszen, D B; Moss, O R

    1997-09-01

    In the present subchronic study, we compared pleural inflammation, visceral pleural collagen deposition, and visceral and parietal pleural mesothelial cell proliferation in rats and hamsters identically exposed to a kaolin-based refractory ceramic fiber, (RCF)-1 by nose-only inhalation exposure, and correlated the results to translocation of fibers to the pleural cavity. Fischer 344 rats and Syrian golden hamsters were exposed to 650 fibers/cc of RCF-1, for 4 hr/day, 5 days/week for 12 weeks. Following 4 and 12 weeks of exposure, and after a 12-week recovery period, pleural lavage fluid was analyzed for cytologic and biochemical evidence of inflammation. Visceral and parietal pleural mesothelial cell proliferation was assessed by immunocytochemical detection of bromodeoxyuridine incorporation. Pleural collagen was quantitated using morphometric analysis of lung sections stained with Sirius Red. Fiber-exposed rats and hamsters had qualitatively similar pleural inflammation at each time point. Mesothelial cell proliferation was more pronounced in hamsters than in rats at each time point and at each site. In both species, the mesothelial cell labeling index was highest in the parietal pleural mesothelial cells lining the surface of the diaphragm at each time point. Hamsters but not rats had significantly elevated collagen in the visceral pleura at the 12-week postexposure time point. Fibers were found in the pleural cavities of both species at each time point. These fibers were generally short and thin. These results suggest that mesothelial cell proliferation and fibroproliferative changes in the pleura of rodents following short-term inhalation exposure are associated with fiber translocation to the pleura and may be predictive of chronic pleural disease outcomes following long-term exposure.

  7. Hematopoietic Stem/Progenitor Cells Express Several Functional Sex Hormone Receptors—Novel Evidence for a Potential Developmental Link Between Hematopoiesis and Primordial Germ Cells

    Science.gov (United States)

    Mierzejewska, Katarzyna; Borkowska, Sylwia; Suszynska, Ewa; Suszynska, Malwina; Poniewierska-Baran, Agata; Maj, Magda; Pedziwiatr, Daniel; Adamiak, Mateusz; Abdel-Latif, Ahmed; Kakar, Sham S.; Ratajczak, Janina; Kucia, Magda

    2015-01-01

    Evidence has accumulated that hematopoietic stem progenitor cells (HSPCs) share several markers with the germline, a connection supported by reports that prolactin, androgens, and estrogens stimulate hematopoiesis. To address this issue more directly, we tested the expression of receptors for pituitary-derived hormones, such as follicle-stimulating hormone (FSH) and luteinizing hormone (LH), on purified murine bone marrow (BM) cells enriched for HSPCs and tested the functionality of these receptors in ex vivo signal transduction studies and in vitro clonogenic assays. We also tested whether administration of pituitary- and gonad-derived sex hormones (SexHs) increases incorporation of bromodeoxyuridine (BrdU) into HSPCs and expansion of hematopoietic clonogenic progenitors in mice and promotes recovery of blood counts in sublethally irradiated animals. We report for the first time that HSPCs express functional FSH and LH receptors and that both proliferate in vivo and in vitro in response to stimulation by pituitary SexHs. Furthermore, based on our observations that at least some of CD45− very small embryonic-like stem cells (VSELs) may become specified into CD45+ HSPCs, we also evaluated the expression of pituitary and gonadal SexHs receptors on these cells and tested whether these quiescent cells may expand in vivo in response to SexHs administration. We found that VSELs express SexHs receptors and respond in vivo to SexHs stimulation, as evidenced by BrdU accumulation. Since at least some VSELs share several markers characteristic of migrating primordial germ cells and can be specified into HSPCs, this observation sheds new light on the BM stem cell hierarchy. PMID:25607657

  8. Effects of minimally toxic levels of carbonyl cyanide P-(trifluoromethoxy) phenylhydrazone (FCCP), elucidated through differential gene expression with biochemical and morphological correlations.

    Science.gov (United States)

    Kuruvilla, Sabu; Qualls, Charles W; Tyler, Ronald D; Witherspoon, Sam M; Benavides, Gina R; Yoon, Lawrence W; Dold, Karen; Brown, Roger H; Sangiah, Subbiah; Morgan, Kevin T

    2003-06-01

    Uncouplers of oxidative phosphorylation have relevance to bioenergetics and obesity. The mechanisms of action of chemical uncouplers of oxidative phosphorylation on biological systems were evaluated using differential gene expression. The transcriptional response in human rhabdomyosarcoma cell line (RD), was elucidated following treatment with carbonyl cyanide p-(trifluoromethoxy) phenylhydrazone (FCCP), a classical uncoupling agent. Changes in mitochondrial membrane potential were used as the biological dosimeter. There was an increase in membrane depolarization with increasing concentrations of FCCP. The concentration at 75% uncoupling (20 microM) was chosen to study gene expression changes, using cDNA-based large-scale differential gene expression (LSDGE) platforms. At the above concentration, subtle light microscopic and clear gene expression changes were observed at 1, 2, and 10 h. Statistically significant transcriptional changes were largely associated with protein synthesis, cell cycle regulation, cytoskeletal proteins, energy metabolism, apoptosis, and inflammatory mediators. Bromodeoxyuridine (BrdU) and propidium iodide (PI) assays revealed cell cycle arrest to occur in the G1 and S phases. There was a significant initial decrease in the intracellular adenosine triphosphate (ATP) concentrations. The following seven genes were selected as potential molecular markers for chemical uncouplers: seryl-tRNA synthetase (Ser-tRS), glutamine-hydrolyzing asparagine synthetase (Glut-HAS), mitochondrial bifunctional methylenetetrahydrofolate dehydrogenase (Mit BMD), mitochondrial heat shock 10-kDa protein (Mit HSP 10), proliferating cyclic nuclear antigen (PCNA), cytoplasmic beta-actin (Act B), and growth arrest and DNA damage-inducible protein 153 (GADD153). Transcriptional changes of all seven genes were later confirmed with reverse transcription-polymerase chain reaction (RT-PCR). These results suggest that gene expression changes may provide a sensitive indicator

  9. Voluntary running prevents progressive memory decline and increases adult hippocampal neurogenesis and growth factor expression after whole-brain irradiation.

    Science.gov (United States)

    Wong-Goodrich, Sarah J E; Pfau, Madeline L; Flores, Catherine T; Fraser, Jennifer A; Williams, Christina L; Jones, Lee W

    2010-11-15

    Whole-brain irradiation (WBI) therapy produces progressive learning and memory deficits in patients with primary or secondary brain tumors. Exercise enhances memory and adult hippocampal neurogenesis in the intact brain, so we hypothesized that exercise may be an effective treatment to alleviate consequences of WBI. Previous studies using animal models to address this issue have yielded mixed results and have not examined potential molecular mechanisms. We investigated the short- and long-term effects of WBI on spatial learning and memory retention and determined whether voluntary running after WBI aids recovery of brain and cognitive function. Forty adult female C57Bl/6 mice given a single dose of 5 Gy or sham WBI were trained 2.5 weeks and up to 4 months after WBI in a Barnes maze. Half of the mice received daily voluntary wheel access starting 1 month after sham or WBI. Daily running following WBI prevented the marked decline in spatial memory retention observed months after irradiation. Bromodeoxyuridine (BrdUrd) immunolabeling and enzyme-linked immunosorbent assay indicated that this behavioral rescue was accompanied by a partial restoration of newborn BrdUrd+/NeuN+ neurons in the dentate gyrus and increased hippocampal expression of brain-derived vascular endothelial growth factor and insulin-like growth factor-1, and occurred despite irradiation-induced elevations in hippocampal proinflammatory cytokines. WBI in adult mice produced a progressive memory decline consistent with what has been reported in cancer patients receiving WBI therapy. Our findings show that running can abrogate this memory decline and aid recovery of adult hippocampal plasticity, thus highlighting exercise as a potential therapeutic intervention.

  10. On the mechanistic differences of benzene-induced leukemogenesis between wild type and p53 knockout mice

    Energy Technology Data Exchange (ETDEWEB)

    Hirabayashi, Yoko; Yoon, Byung-Il; Kawasaki, Yasushi; Li, Guang-Xun; Kanno, Jun; Inoue, Tohru [National Inst. of Health Sciences, Tokyo (Japan)

    2003-07-01

    Leukemia induction by benzene inhalation was first reported by Le Noire in 1887, described multiple cases of leukemia among Parisian cobblers. However, experimental induction of leukemia by benzene exposure was not succeeded for a hundred years, until Snyder et al. and our group reported it nearly 20 years ago. Nevertheless, the mechanistic background of benzene-induced leukemia was still an enigma until recently a benzene-induced peculiar cell kinetics of the stem/progenitor cells has been elucidated by our study, demonstrated a marked repeated oscillatory decrease in peripheral blood and bone marrow (BM) cellularity during and after benzene exposure, which epigenetically preceded and developed the leukemia more than a year later. We utilized the BUUV (bromodeoxyuridine + UV exposure) method to study stem/progenitor cell kinetics during and/or after benzene exposure. Using these methods, we were able to measure the labeling rate, cycling fraction of clonogenic progenitor cells, and other cell cycle parameters. The cycling fraction of stem/progenitor cells was found not to turn into an active hematopoiesis but to remain low during benzene inhalation and further we found evidence that the cycling fraction depression may be mediated in part by a slowing of stem/progenitor cell cycling perse by up-regulation of p21. The benzene induced leukemogenicity between mice carrying wild-type p53 and mice lacking p53 seem to differ from one another. In the case of p53 knockout mouse, DNA damage such as weak mutagenicity and or chromosomal damages are retained, and those damages participated in the induction of a consequent activation of proto-oncogenes and the like, which led cells to further neoplastic changes. In contrast, in the case of wild type mice, a dramatic oscillational change in the cell cycle of the stem cell compartment seems to be an important factor for mice carrying the p53 gene. (author)

  11. Enhancement of vinorelbine-induced cytotoxicity and apoptosis by clomipramine and lithium chloride in human neuroblastoma cancer cell line SH-SY5Y.

    Science.gov (United States)

    Bilir, Ayhan; Erguven, Mine; Yazihan, Nuray; Aktas, Esin; Oktem, Gulperi; Sabanci, Akin

    2010-12-01

    The aim of this work is to investigate whether clomipramine (CIM) and lithium chloride (LiCl) potentiate the cytotoxicity of vinorelbine (VNR) on SH-SY5Y human neuroblastoma cells in vitro and whether midkine (MK) can be a resistance factor for these treatments. Four groups of experiments were performed for 96 h using both monolayer and spheroid cultures of SH-SY5Y cells: (1) control group, (2) singly applied VNR, CIM, and LiCl, (3) VNR with CIM, and (4) VNR with LiCl. Their effects on monolayer and spheroid cultures were determined by evaluating cell proliferation, bromodeoxyuridine labeling index (BrdU-LI), apoptosis, cyclic adenosine monophosphate (cAMP) and midkine levels, colony-forming efficiency, spheroid size, and ultrastructure. In comparison with the control group, single and combination drug treatments significantly reduced the proliferation index (PI) for 96 h. The most potent reduction of PI was observed with VNR in combination with CIM and LiCl for all time intervals. VNR with CIM and LiCl seemed to be ineffective in reducing BrdU-LI of both monolayer cell and spheroid cultures, spheroid size, and cAMP level. VNR with LiCl increased apoptosis at 24 h, however VNR with CIM increased apoptosis at 96 h. VNR was the most potent drug in inhibiting colony-forming efficiency. The combination of VNR with CIM was the most potent in reducing midkine levels among all groups. Interestingly, the combination of VNR with LiCl led to both nuclear membrane breakdown and disappearance of the cellular membranes inside the spheroids. Both CIM and LiCl seemed to potentiate VNR-induced cytotoxicity, and MK was not a resistance factor for VNR, LiCl, and CIM.

  12. Curcumin Triggers p16-Dependent Senescence in Active Breast Cancer-Associated Fibroblasts and Suppresses Their Paracrine Procarcinogenic Effects

    Directory of Open Access Journals (Sweden)

    Siti-Fauziah Hendrayani

    2013-06-01

    Full Text Available Activated cancer-associated fibroblasts (CAFs or myofibroblasts not only facilitate tumor growth and spread but also affect tumor response to therapeutic agents. Therefore, it became clear that efficient therapeutic regimens should also take into account the presence of these supportive cells and inhibit their paracrine effects. To this end, we tested the effect of low concentrations of curcumin, a pharmacologically safe natural product, on patient-derived primary breast CAF cells. We have shown that curcumin treatment upregulates p16INK4A and other tumor suppressor proteins while inactivates the JAK2/STAT3 pathway. This reduced the level of alpha-smooth muscle actin (α-SMA and the migration/invasion abilities of these cells. Furthermore, curcumin suppressed the expression/secretion of stromal cell-derived factor-1 (SDF-1, interleukin-6 (IL-6, matrix metalloproteinase-2 (MMP-2, MMP-9, and transforming growth factor-β, which impeded their paracrine procarcinogenic potential. Intriguingly, these effects were sustained even after curcumin withdrawal and cell splitting. Therefore, using different markers of senescence [senescence-associated β-galactosidase (SA-β-gal activity, Ki-67 and Lamin B1 levels, and bromodeoxyuridine incorporation], we have shown that curcumin markedly suppresses Lamin B1 and triggers DNA damage-independent senescence in proliferating but not quiescent breast stromal fibroblasts. Importantly, this curcumin-related senescence was p16INK4A-dependent and occurred with no associated inflammatory secretory phenotype. These results indicate the possible inactivation of cancer-associated myofibroblasts and present the first indication that curcumin can trigger DNA damage-independent and safe senescence in stromal fibroblasts.

  13. Effect of combined VEGF165/ SDF-1 gene therapy on vascular remodeling and blood perfusion in cerebral ischemia.

    Science.gov (United States)

    Hu, Guo-Jie; Feng, Yu-Gong; Lu, Wen-Peng; Li, Huan-Ting; Xie, Hong-Wei; Li, Shi-Fang

    2016-12-16

    OBJECTIVE Therapeutic neovascularization is a promising strategy for treating patients after an ischemic stroke; however, single-factor therapy has limitations. Stromal cell-derived factor 1 (SDF-1) and vascular endothelial growth factor (VEGF) proteins synergistically promote angiogenesis. In this study, the authors assessed the effect of combined gene therapy with VEGF165 and SDF-1 in a rat model of cerebral infarction. METHODS An adenoviral vector expressing VEGF165 and SDF-1 connected via an internal ribosome entry site was constructed (Ad- VEGF165-SDF-1). A rat model of middle cerebral artery occlusion (MCAO) was established; either Ad- VEGF165-SDF-1 or control adenovirus Ad- LacZ was stereotactically microinjected into the lateral ventricle of 80 rats 24 hours after MCAO. Coexpression and distribution of VEGF165 and SDF-1 were examined by reverse-transcription polymerase chain reaction, Western blotting, and immunofluorescence. The neurological severity score of each rat was measured on Days 3, 7, 14, 21, and 28 after MCAO. Angiogenesis and vascular remodeling were evaluated via bromodeoxyuridine and CD34 immunofluorescence labeling. Relative cerebral infarction volumes were determined by T2-weighted MRI and triphenyltetrazolium chloride staining. Cerebral blood flow, relative cerebral blood volume, and relative mean transmit time were assessed using perfusion-weighted MRI. RESULTS The Ad- VEGF165-SDF-1 vector mediated coexpression of VEGF165 and SDF-1 in multiple sites around the ischemic core, including the cortex, corpus striatum, and hippocampal granular layer. Coexpression of VEGF165 and SDF-1 improved neural function, reduced cerebral infarction volume, increased microvascular density and promoted angiogenesis in the ischemic penumbra, and improved cerebral blood flow and perfusion. CONCLUSIONS Combined VEGF165 and SDF-1 gene therapy represents a potential strategy for improving vascular remodeling and recovery of neural function after cerebral

  14. Preferential S phase entry and apoptosis of CD4(+) T lymphocytes of HIV-1-infected patients after in vitro cultivation.

    Science.gov (United States)

    Patki, A H; Zielske, S P; Sieg, S F; Lederman, M M

    2000-12-01

    We have studied the relationship between spontaneous apoptosis and cell cycle perturbations in circulating peripheral blood lymphocytes of HIV-1-infected patients and healthy controls. PBMC obtained from HIV-1-infected patients and healthy controls were incubated in culture medium for 48 h. Cells were separated into CD4(+) and CD8(+) populations using immunomagnetic beads. Apoptosis and cell cycle phases were measured by propidium iodide staining and bromodeoxyuridine (BrdU) incorporation followed by flow cytometric analyses. In experiments using cells obtained from HIV-1-infected patients, spontaneous apoptosis was more frequent in CD4(+) T lymphocytes than in CD8(+) T lymphocytes (17.6% vs 9.5%, P lymphocytes was comparable (4.5% vs 5.1%). Lymphocytes obtained from patients were more frequently in S phase than healthy controls' cells (2.2 +/- 0.9% vs 0.5 +/- 0.2%, P 0.4). Kinetic analyses using BrdU and PI staining revealed that S phase cells were more likely to become apoptotic than resting (G(0)-G(1)) cells (28.4% +/- 10.3% vs 11.3% +/- 9.9% in patients, P Lymphocytes obtained from HIV-1-infected persons are activated in vivo to enter S phase and to undergo spontaneous apoptosis after brief in vitro cultivation. The present studies indicate that most apoptotic cells in this system are CD4(+) and kinetic analyses reveal that S phase cells are more likely to undergo spontaneous apoptosis than G(0)-G(1) cells. Accelerated cell death in HIV-1 disease may contribute to the failure of lymphocyte responsiveness to appropriate T cell receptor stimulation.

  15. Commonly consumed and specialty dietary mushrooms reduce cellular proliferation in MCF-7 human breast cancer cells.

    Science.gov (United States)

    Martin, Keith R; Brophy, Sara K

    2010-11-01

    Worldwide, over one million women will be newly diagnosed with breast cancer in the next year. Moreover, breast cancer is the second leading cause of cancer death in the USA. An accumulating body of evidence suggests that consumption of dietary mushrooms can protect against breast cancer. In this study, we tested and compared the ability of five commonly consumed or specialty mushrooms to modulate cell number balance in the cancer process using MCF-7 human breast cancer cells. Hot water extracts (80°C for 2 h) of maitake (MT, Grifola frondosa), crimini (CRIM, Agaricus bisporus), portabella (PORT, Agaricus bisporus), oyster (OYS, Pleurotus ostreatus) and white button (WB, Agaricus bisporus) mushrooms or water alone (5% v/v) were incubated for 24 h with MCF-7 cells. Cellular proliferation determined by bromodeoxyuridine incorporation was significantly (P mushrooms, with MT and OYS being the most effective. MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) reduction, an often used mitochondrion-dependent marker of proliferation, was unchanged although decreased (P > 0.05) by 15% with OYS extract. Lactate dehydrogenase release, as a marker of necrosis, was significantly increased after incubation with MT but not with other test mushrooms. Furthermore, MT extract significantly increased apoptosis, or programmed cell death, as determined by terminal deoxynucleotidyl end labeling method, whereas other test mushrooms displayed trends of ∼15%. The total numbers of cells per flask, determined by hemacytometry, were not different from control cultures. Overall, all test mushrooms significantly suppressed cellular proliferation, with MT further significantly inducing apoptosis and cytotoxicity in human breast cancer cells. This suggests that both common and specialty mushrooms may be chemoprotective against breast cancer.

  16. Ethanol affects the development of sensory hair cells in larval zebrafish (Danio rerio.

    Directory of Open Access Journals (Sweden)

    Phillip M Uribe

    Full Text Available Children born to mothers with substantial alcohol consumption during pregnancy can present a number of morphological, cognitive, and sensory abnormalities, including hearing deficits, collectively known as fetal alcohol syndrome (FAS. The goal of this study was to determine if the zebrafish lateral line could be used to study sensory hair cell abnormalities caused by exposure to ethanol during embryogenesis. Some lateral line sensory hair cells are present at 2 days post-fertilization (dpf and are functional by 5 dpf. Zebrafish embryos were raised in fish water supplemented with varying concentrations of ethanol (0.75%-1.75% by volume from 2 dpf through 5 dpf. Ethanol treatment during development resulted in many physical abnormalities characteristic of FAS in humans. Also, the number of sensory hair cells decreased as the concentration of ethanol increased in a dose-dependent manner. The dye FM 1-43FX was used to detect the presence of functional mechanotransduction channels. The percentage of FM 1-43-labeled hair cells decreased as the concentration of ethanol increased. Methanol treatment did not affect the development of hair cells. The cell cycle markers proliferating cell nuclear antigen (PCNA and bromodeoxyuridine (BrdU demonstrated that ethanol reduced the number of sensory hair cells, as a consequence of decreased cellular proliferation. There was also a significant increase in the rate of apoptosis, as determined by TUNEL-labeling, in neuromasts following ethanol treatment during larval development. Therefore, zebrafish are a useful animal model to study the effects of hair cell developmental disorders associated with FAS.

  17. Perinatal supplementation with omega-3 polyunsaturated fatty acids improves sevoflurane-induced neurodegeneration and memory impairment in neonatal rats.

    Directory of Open Access Journals (Sweden)

    Xi Lei

    Full Text Available OBJECTIVES: To investigate if perinatal Omega-3 polyunsaturated fatty acids (n-3 PUFAs supplementation can improve sevoflurane-induced neurotoxicity and cognitive impairment in neonatal rats. METHODS: Female Sprague-Dawley rats (n = 3 each group were treated with or without an n-3 PUFAs (fish oil enriched diet from the second day of pregnancy to 14 days after parturition. The offspring rats (P7 were treated with six hours sevoflurane administration (one group without sevoflurane/prenatal n-3 PUFAs supplement as control. The 5-bromodeoxyuridine (Brdu was injected intraperitoneally during and after sevoflurane anesthesia to assess dentate gyrus (DG progenitor proliferation. Brain tissues were harvested and subjected to Western blot and immunohistochemistry respectively. Morris water maze spatial reference memory, fear conditioning, and Morris water maze memory consolidation were tested at P35, P63 and P70 (n = 9, respectively. RESULTS: Six hours 3% sevoflurane administration increased the cleaved caspase-3 in the thalamus, parietal cortex but not hippocampus of neonatal rat brain. Sevoflurane anesthesia also decreased the neuronal precursor proliferation of DG in rat hippocampus. However, perinatal n-3 PUFAs supplement could decrease the cleaved caspase-3 in the cerebral cortex of neonatal rats, and mitigate the decrease in neuronal proliferation in their hippocampus. In neurobehavioral studies, compared with control and n-3 PUFAs supplement groups, we did not find significant spatial cognitive deficit and early long-term memory impairment in sevoflurane anesthetized neonatal rats at their adulthood. However, sevoflurane could impair the immediate fear response and working memory and short-term memory. And n-3 PUFAs could improve neurocognitive function in later life after neonatal sevoflurane exposure. CONCLUSION: Our study demonstrated that neonatal exposure to prolonged sevoflurane could impair the immediate fear response, working

  18. Consequences of TCDD treatment on intra-hepatic lymphocytes during liver regeneration.

    Science.gov (United States)

    Horras, Christopher J; Lamb, Cheri L; King, Allie L; Hanley, Jason R; Mitchell, Kristen A

    2012-01-01

    Increasing evidence demonstrates a physiological role for the aryl hydrocarbon receptor (AhR) in regulating hepatocyte cell cycle progression. Previous studies have used a murine model of liver regeneration to show that exposure to the potent exogenous AhR ligand, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), suppresses hepatocyte proliferation in vivo. Based on recent reports that natural killer (NK) cells negatively regulate liver regeneration, coupled with the well-established immunomodulatory effects of TCDD, it was hypothesized that alterations in lymphocyte activation contribute to the suppression of liver regeneration in TCDD-treated mice. To test this, mice were treated with TCDD (20 μg/kg) 1 day prior to 70% partial hepatectomy (PH), in which two-thirds of the liver was surgically resected. Lymphocytes were collected from the remnant liver and analyzed by flow cytometry. Whereas exposure to TCDD did not alter the number of NK cells or CD3(+) T-cells recovered from the regenerating liver, it reduced the percentage and number of intra-hepatic NKT cells 42 h after PH. With regard to lymphocyte activation, TCDD treatment transiently increased CD69 expression on NK and NKT cells 12 h after PH, but had no effect on intracellular levels of IFNγ in NK, NKT, or CD3(+) T-cells. To determine the relevance of NK cells to the suppression of liver regeneration by TCDD, mice were treated with anti-Asialo GM-1 (ASGM-1) antibody to deplete NK cells prior to TCDD treatment and PH, and hepatocyte proliferation was measured using bromodeoxyuridine incorporation. Exposure to TCDD was found to inhibit hepatocyte proliferation in the regenerating liver of NK cell-depleted mice and control mice to the same extent. Hence, it is unlikely that enhanced numbers or increased activation of NK cells contribute to the suppression of liver regeneration in TCDD-treated mice.

  19. Pituitary adenylate cyclase-activating polypeptide (PACAP) and vasoactive intestinal peptide (VIP) regulate murine neural progenitor cell survival, proliferation, and differentiation.

    Science.gov (United States)

    Scharf, Eugene; May, Victor; Braas, Karen M; Shutz, Kristin C; Mao-Draayer, Yang

    2008-11-01

    Neural stem/progenitor cells (NPC) have gained wide interest over the last decade from their therapeutic potential, either through transplantation or endogenous replacement, after central nervous system (CNS) disease and damage. Whereas several growth factors and cytokines have been shown to promote NPC survival, proliferation, or differentiation, the identification of other regulators will provide much needed options for NPC self-renewal or lineage development. Although previous studies have shown that pituitary adenylate cyclase-activating polypeptide (PACAP)/vasoactive intestinal peptide (VIP) can regulate stem/progenitor cells, the responses appeared variable. To examine the direct roles of these peptides in NPCs, postnatal mouse NPC cultures were withdrawn from epidermal growth factor (EGF) and fibroblastic growth factor (FGF) and maintained under serum-free conditions in the presence or absence of PACAP27, PACAP38, or VIP. The NPCs expressed the PAC1(short)null receptor isoform, and the activation of these receptors decreased progenitor cell apoptosis more than 80% from TUNEL assays and facilitated proliferation more than fivefold from bromodeoxyuridine (BrdU) analyses. To evaluate cellular differentiation, replicate control and peptide-treated cultures were examined for cell fate marker protein and transcript expression. In contrast with previous work, PACAP peptides downregulated NPC differentiation, which appeared consistent with the proliferation status of the treated cells. Accordingly, these results demonstrate that PACAP signaling is trophic and can maintain NPCs in a multipotent state. With these attributes, PACAP may be able to promote endogenous NPC self-renewal in the adult CNS, which may be important for endogenous self-repair in disease and ageing processes.

  20. Partial podocyte replenishment in experimental FSGS derives from nonpodocyte sources.

    Science.gov (United States)

    Kaverina, Natalya V; Eng, Diana G; Schneider, Remington R S; Pippin, Jeffrey W; Shankland, Stuart J

    2016-06-01

    The current studies used genetic fate mapping to prove that adult podocytes can be partially replenished following depletion. Inducible NPHS2-rtTA/tetO-Cre/RS-ZsGreen-R reporter mice were generated to permanently label podocytes with the ZsGreen reporter. Experimental focal segmental glomerulosclerosis (FSGS) was induced with a cytotoxic podocyte antibody. On FSGS day 7, immunostaining for the podocyte markers p57, synaptopodin, and podocin were markedly decreased by 44%, and this was accompanied by a decrease in ZsGreen fluorescence. The nuclear stain DAPI was absent in segments of reduced ZsGreen and podocyte marker staining, which is consistent with podocyte depletion. Staining for p57, synaptopodin, podocin, and DAPI increased at FSGS day 28 and was augmented by the ACE inhibitor enalapril, which is consistent with a partial replenishment of podocytes. In contrast, ZsGreen fluorescence did not return and remained significantly low at day 28, indicating replenishment was from a nonpodocyte origin. Despite administration of bromodeoxyuridine (BrdU) thrice weekly throughout the course of disease, BrdU staining was not detected in podocytes, which is consistent with an absence of proliferation. Although ZsGreen reporting was reduced in the tuft at FSGS day 28, labeled podocytes were detected along the Bowman's capsule in a subset of glomeruli, which is consistent with migration from the tuft. Moreover, more than half of the migrated podocytes coexpressed the parietal epithelial cell (PEC) proteins claudin-1, SSeCKS, and PAX8. These results show that although podocytes can be partially replenished following abrupt depletion, a process augmented by ACE inhibition, the source or sources are nonpodocyte in origin and are independent of proliferation. Furthermore, a subset of podocytes migrate to the Bowman's capsule and begin to coexpress PEC markers.

  1. Neuroprotective efficacy of a proneurogenic compound after traumatic brain injury.

    Science.gov (United States)

    Blaya, Meghan O; Bramlett, Helen M; Naidoo, Jacinth; Pieper, Andrew A; Dietrich, W Dalton

    2014-03-01

    Traumatic brain injury (TBI) is characterized by histopathological damage and long-term sensorimotor and cognitive dysfunction. Recent studies have reported the discovery of the P7C3 class of aminopropyl carbazole agents with potent neuroprotective properties for both newborn neural precursor cells in the adult hippocampus and mature neurons in other regions of the central nervous system. This study tested, for the first time, whether the highly active P7C3-A20 compound would be neuroprotective, promote hippocampal neurogenesis, and improve functional outcomes after experimental TBI. Sprague-Dawley rats subjected to moderate fluid percussion brain injury were evaluated for quantitative immunohistochemical and behavioral changes after trauma. P7C3-A20 (10 mg/kg) or vehicle was initiated intraperitoneally 30 min postsurgery and twice per day every day thereafter for 7 days. Administration of P7C3-A20 significantly reduced overall contusion volume, preserved vulnerable anti-neuronal nuclei (NeuN)-positive pericontusional cortical neurons, and improved sensorimotor function 1 week after trauma. P7C3-A20 treatment also significantly increased both bromodeoxyuridine (BrdU)- and doublecortin (DCX)-positive cells within the subgranular zone of the ipsilateral dentate gyrus 1 week after TBI. Five weeks after TBI, animals treated with P7C3-A20 showed significantly increased BrdU/NeuN double-labeled neurons and improved cognitive function in the Morris water maze, compared to TBI-control animals. These results suggest that P7C3-A20 is neuroprotective and promotes endogenous reparative strategies after TBI. We propose that the chemical scaffold represented by P7C3-A20 provides a basis for optimizing and advancing new pharmacological agents for protecting patients against the early and chronic consequences of TBI.

  2. E2F4 and ribonucleotide reductase mediate S-phase arrest in colon cancer cells treated with chlorophyllin.

    Science.gov (United States)

    Chimploy, Korakod; Díaz, G Dario; Li, Qingjie; Carter, Orianna; Dashwood, Wan-Mohaiza; Mathews, Christopher K; Williams, David E; Bailey, George S; Dashwood, Roderick H

    2009-11-01

    Chlorophyllin (CHL) is a water-soluble derivative of chlorophyll that exhibits cancer chemopreventive properties, but which also has been studied for its possible cancer therapeutic effects. We report here that human colon cancer cells treated with CHL accumulate in S-phase of the cell cycle, and this is associated with reduced expression levels of p53, p21, and other G(1)/S checkpoint controls. At the same time, E2F1 and E2F4 transcription factors become elevated and exhibit increased DNA binding activity. In CHL-treated colon cancer cells, bromodeoxyuridine pulse-chase experiments provided evidence for the inhibition of DNA synthesis. Ribonucleotide reductase (RR), a pivotal enzyme for DNA synthesis and repair, was reduced at the mRNA and protein level after CHL treatment, and the enzymatic activity was inhibited in a concentration-dependent manner both in vitro and in vivo. Immunoblotting revealed that expression levels of RR subunits R1, R2, and p53R2 were reduced by CHL treatment in HCT116 (p53(+/+)) and HCT116 (p53(-/-)) cells, supporting a p53-independent mechanism. Prior studies have shown that reduced levels of RR small subunits can increase the sensitivity of colon cancer cells to clinically used DNA-damaging agents and RR inhibitors. We conclude that by inhibiting R1, R2, and p53R2, CHL has the potential to be effective in the clinical setting, when used alone or in combination with currently available cancer therapeutic agents.

  3. Role for neuronal nitric-oxide synthase in cannabinoid-induced neurogenesis.

    Science.gov (United States)

    Kim, Sun Hee; Won, Seok Joon; Mao, Xiao Ou; Ledent, Catherine; Jin, Kunlin; Greenberg, David A

    2006-10-01

    Cannabinoids, acting through the CB1 cannabinoid receptor (CB1R), protect the brain against ischemia and related forms of injury. This may involve inhibiting the neurotoxicity of endogenous excitatory amino acids and downstream effectors, such as nitric oxide (NO). Cannabinoids also stimulate neurogenesis in the adult brain through activation of CB1R. Because NO has been implicated in neurogenesis, we investigated whether cannabinoid-induced neurogenesis, like cannabinoid neuroprotection, might be mediated through alterations in NO production. Accordingly, we measured neurogenesis in dentate gyrus (DG) and subventricular zone (SVZ) of CB1R-knockout (KO) and wild-type mice, some of whom were treated with the cannabinoid agonist R(+)-Win 55212-2 [(+)-[2,3-dihydro-5-methyl-3-[(morpholinyl)methyl]pyrrolo[1,2,3-de]-1,4-benzoxazin-yl]-(1-naphthalenyl)methanone] or the NO synthase (NOS) inhibitor 7-nitroindazole (7-NI). NOS activity was increased by approximately 25%, whereas bromodeoxyuridine (BrdU) labeling of newborn cells in DG and SVZ was reduced by approximately 50% in CB1R-KO compared with wild-type mice. 7-NI increased BrdU labeling in both DG and SVZ and to a greater extent in CB1R-KO than in wild-type mice. In addition, R(+)-Win 55212-2 and 7-NI enhanced BrdU incorporation into neuron-enriched cerebral cortical cultures to a similar maximal extent and in nonadditive fashion, consistent with a shared mechanism of action. Double-label confocal microscopy showed coexpression of BrdU and the neuronal lineage marker doublecortin (Dcx) in DG and SVZ of untreated and 7-NI-treated CB1R-KO mice, and 7-NI increased the number of Dcx- and BrdU/Dcx-immunoreactive cells in SVZ and DG. Thus, cannabinoids appear to stimulate adult neurogenesis by opposing the antineurogenic effect of NO.

  4. [Overgrowth and DNA synthesis of neuroepithelium in embryonic stages of induced Long-Evans rat myeloschisis].

    Science.gov (United States)

    Chono, Y

    1993-01-01

    Overgrowth of the myeloschisis, namely the excessive amount of the neural plate tissue, has been reported in the human myeloschisis. However, it is still debatable how the overgrowth develops and whether the overgrowth is the cause, or the secondary effect of spinal dysraphism. The author induced myeloschisis in the fetuses of Long-Evans rats by the administration of ethylenethiourea (ETU) to pregnant rats on day 10 of gestation. The fetuses were removed 1 hour after the treatment with bromodeoxyuridine (BrdU) to the dams on day 14 and 21. The fetuses were fixed in alcohol and embedded in paraffin. H-E staining and the immunohistologic examination were performed on the staining patterns to anti-neurofilament (NFP), anti-glial fibrillary acidic protein (GFAP) and anti-BrdU antibody by ABC method. On day 14, the lateral portion of everted neural plate showed a loose arrangement of cells and there was rosette formation in the mesoderm. On day 21, cell necrosis was observed at the dorsolateral portion of myeloschisis, although the ventral portion showed almost normal cytoarchitecture and was positive to NFP and GFAP. The cause of myeloschisis in this model is supposed to be the local and direct cytotoxic effect of ETU to neuro-ectodermal junction. On day 14, control animals contained few BrdU-incorporated cells at the basal plate of neural tube. In contrast, everted neural plate showed an active uptake of BrdU diffusely in the subependymal matrix layer cells. Overgrowth was not yet identified. On day 21, overgrowth of myeloschisis was found in spite of a few positive cells to BrdU which was identical to the control animals. These findings seem to suggest that cells in the myeloschisis retain their ability of DNA synthesis for longer periods of development and overgrowth found on day 21 is possibly a secondary effect of spinal dysraphism in this model.

  5. Modulation of pancreatic MIN6 insulin secretion and proliferation and extrapancreatic glucose absorption with Achillea santolina, Eryngium creticum and Pistacia atlantica extracts: in vitro evaluation

    Directory of Open Access Journals (Sweden)

    Lara Majdalawi

    2012-06-01

    Full Text Available Objective: The present in vitro studies aimed to investigate the pancreatic and extrapancreatic effects of crude aqueous extracts (AE of Achillea santolina L, Eryngium creticum Lam, and Pistacia atlantica Desf utilized in Jordan diabetes ethnomedicine. Methods: Bioassays of β-cell proliferation and insulin secretion as well as glucose diffusion as possible modes of action were recruited. Results: Similar to L-alanine insulinotropic efficacy in MIN6 β-cell, glucose-stimulated Ca2+ regulated- insulin secretion was potentiated by AEs of E.creticum (0.01 mg/ml and P.atlantica (0.01, 0.1 and 0.5 mg/ml. A.santolina AE, however, was found ineffective. Comparable to glucagon-like peptid-1-enhanced β-cell proliferation in 2-day treatment wells, a dose dependent augmentation of bromodeoxyuridine incorporation was obtained with the A.santolina AE (0.05-1 mg/ml, and E.creticum AE (0.1, 0.5 and 1 mg/ml. P.atlantica concentrations lacked pancreatic proliferative capacity. While A.santolina and E.creticum AEs proved inactive, P.atlantica inhibited dose dependently overnight glucose movement in vitro, as effectively as guar gum diffusional hindrance in a simple glucose dialysis model. Conclusion: Current findings signify the in vitro diverse therapeutic antidiabetes properties of the selected medicinal plants. Future directives may assess the use of A.santolina, E.creticum and P.atlantica as new potential sources of functional foods or nutraceuticals or active leads into diabetes type 2 pharmacotherapy. [J Exp Integr Med 2012; 2(3.000: 245-254

  6. Nitroglycerin enhances proliferation and osteoblastic differentiation in human mesenchymal stem cells via nitric oxide pathway

    Institute of Scientific and Technical Information of China (English)

    Li HUANG; Ni QIU; Che ZHANG; Hong-yan WEI; Ya-lin LI; Hong-hao ZHOU; Zhou-sheng XIAO

    2008-01-01

    Aim: To investigate the effect of nitroglycerin (NTG) on cell proliferation and osteoblastic differentiation of human bone marrow-derived mesenchymal stem cells (HBMSC) and its mechanisms. Methods: Primary HBMSC were cultured in osteogenic differentiation medium consisting of phenol red-free or-minimum es-sential media plus 10% fetal bovine serum (dextran-coated charcoal stripped)supplemented with 10 nmol/L dexamethasone, 50 mg/L ascorbic acid, and l0 mmol/Lβ-glycerophosphate for inducing osteoblastic differentiation. The cells were treated with NTG (0.1-10 μmol/L) alone or concurrent incubation with different nitric oxide synthase (NOS) inhibitors. Nitric oxide (NO) production was measured by using a commercial NO kit. Cell proliferation was measured by 5-bromodeoxyuridine (BrdU) incorporation. The osteoblastic differentiation of HBMSC culture was evaluated by measuring cellular alkaline phosphatase (ALP) activity and calcium deposition, as well as osteoblastic markers by real-time RT-PCR. Results: The treatment of HBMSC with NTG (0.1-10 μmol/L) led to a dose-dependent increase of NO production in the conditional medium. The release of NO by NTG resulted in increased cell proliferation and osteoblastic differentiation of HBMSC, as evi-denced by the increment of the BrdU incorporation, the induction of ALP activity in the early stage, and the calcium deposition in the latter stage. The increment of NO production was also correlated with the upregulation of osteoblastic markers in HBMSC cultures. However, the stimulatory effect of NTG (10 μmol/L) could not be abolished by either NG-nitro-L-arginine methyl ester, an antagonist of endothe-lial NOS, or 1400W, a selective blocker of inducible NOS activity. Conclusion: NTG stimulates cell proliferation and osteoblastic differentiation of HBMSC through a direct release of NO, which is independent on intracellular NOS activity.

  7. Proteomic analysis of protein changes developing in rat hippocampus after chronic antidepressant treatment: Implications for depressive disorders and future therapies.

    Science.gov (United States)

    Khawaja, Xavier; Xu, Jun; Liang, Jin-Jun; Barrett, James E

    2004-02-15

    It is recognized that monoamine reuptake inhibitors (MARIs) exert beneficial effects in the treatment of major depression and general anxiety disorder. The aim of this study was to identify proteins regulated by this class of antidepressant using a proteome differential profiling approach. Either venlafaxine or fluoxetine was administered systemically to adult rats for 2 weeks, and protein patterns from rat hippocampal cytosolic extracts were compared by two-dimensional gel electrophoresis. Silver-stained protein spots displaying differential expression were identified by mass spectrometry. Thirty-three protein spots were modulated by both drug treatments compared to controls. The classification of several proteins that were sorted by function suggested convergent pathway activities for both MARIs at the post-receptor level. These included proteins associated with neurogenesis (insulin like growth factor 1 (IGF-1), glia maturation factor [GMF]-beta), outgrowth/maintenance of neuronal processes (hippocampal cholinergic neurostimulating peptide [HCNP], PCTAIRE-3), and with neural regeneration/axonal guidance collapsin response mediator protein (CRMP-2) systems. Other modulated proteins indicated an increase in neuronal vesicular cell trafficking and synaptic plasticity (Ras-related protein 4a (Rab4a), Ras-related protein 1b (Rab1b), heat shock protein 10 [HSP10]), as well as neurosteroidogenic (hydroxysteroid sulfotransferase A) and possible anti-apoptotic (dimethylargininase-1 L-N,N-dimethylarginine dimethylaminohydrolase-1 [DDAH-1], pyruvate dehydrogenase-E1 [PDH-E1], antioxidant protein-2 [AOP-2]) pathway-mediated regulatory events. Parallel studies to investigate further the effects of venlafaxine and fluoxetine on adult hippocampal neurogenesis in vivo by quantitative bromodeoxyuridine immunolabeling revealed a significant drug-induced increase in the proliferation rate and long-term survivability of progenitor stem cells located in the subgranular zone. These

  8. Chemotherapy-induced cognitive impairment is associated with decreases in cell proliferation and histone modifications

    Directory of Open Access Journals (Sweden)

    Briones Teresita L

    2011-12-01

    Full Text Available Abstract Background In this study, we examined the effects of cyclophosphamide, methothrexate, and 5-Fluorouracil (CMF drug combination on various aspects of learning and memory. We also examined the effects of CMF on cell proliferation and chromatin remodeling as possible underlying mechanisms to explain chemotherapy-associated cognitive dysfunction. Twenty-four adult female Wistar rats were included in the study and had minimitter implantation for continuous activity monitoring two weeks before the chemotherapy regimen was started. Once baseline activity data were collected, rats were randomly assigned to receive either CMF or saline injections given intraperitoneally. Treatments were given once a week for a total of 4 weeks. Two weeks after the last injection, rats were tested in the water maze for spatial learning and memory ability as well as discrimination learning. Bromodeoxyuridine (BrdU injection was given at 100 mg/Kg intraperitoneally 4 hours prior to euthanasia to determine hippocampal cell proliferation while histone acetylation and histone deacetylase activity was measured to determine CMF effects on chromatin remodeling. Results Our data showed learning and memory impairment following CMF administration independent of the drug effects on physical activity. In addition, CMF-treated rats showed decreased hippocampal cell proliferation, associated with increased histone acetylation and decreased histone deacetylase activity. Conclusions These results suggest the negative consequences of chemotherapy on brain function and that anti-cancer drugs can adversely affect the self-renewal potential of neural progenitor cells and also chromatin remodeling in the hippocampus. The significance of our findings lie on the possible usefulness of animal models in addressing the clinical phenomenon of 'chemobrain.'

  9. The exceptional stem cell system of Macrostomum lignano: Screening for gene expression and studying cell proliferation by hydroxyurea treatment and irradiation

    Directory of Open Access Journals (Sweden)

    Eichberger Paul

    2007-03-01

    Full Text Available Abstract Background Flatworms are characterized by an outstanding stem cell system. These stem cells (neoblasts can give rise to all cell types including germ cells and power the exceptional regenerative capacity of many flatworm species. Macrostomum lignano is an emerging model system to study stem cell biology of flatworms. It is complementary to the well-studied planarians because of its small size, transparency, simple culture maintenance, the basal taxonomic position and its less derived embryogenesis that is more closely related to spiralians. The development of cell-, tissue- and organ specific markers is necessary to further characterize the differentiation potential of flatworm stem cells. Large scale in situ hybridization is a suitable tool to identify possible markers. Distinguished genes identified in a large scale screen in combination with manipulation of neoblasts by hydroxyurea or irradiation will advance our understanding of differentiation and regulation of the flatworm stem cell system. Results We have set up a protocol for high throughput large scale whole mount in situ hybridization for the flatworm Macrostomum lignano. In the pilot screen, a number of cell-, tissue- or organ specific expression patterns were identified. We have selected two stem cell- and germ cell related genes – macvasa and macpiwi – and studied effects of hydroxyurea (HU treatment or irradiation on gene expression. In addition, we have followed cell proliferation using a mitosis marker and bromodeoxyuridine labeling of S-phase cells after various periods of HU exposure or different irradiation levels. HU mediated depletion of cell proliferation and HU induced reduction of gene expression was used to generate a cDNA library by suppressive subtractive hybridization. 147 differentially expressed genes were sequenced and assigned to different categories. Conclusion We show that Macrostomum lignano is a suitable organism to perform high throughput large

  10. Intact neurogenesis is required for benefits of exercise on spatial memory but not motor performance or contextual fear conditioning in C57BL/6J mice.

    Science.gov (United States)

    Clark, P J; Brzezinska, W J; Thomas, M W; Ryzhenko, N A; Toshkov, S A; Rhodes, J S

    2008-09-09

    The mammalian hippocampus continues to generate new neurons throughout life. Experiences such as exercise, anti-depressants, and stress regulate levels of neurogenesis. Exercise increases adult hippocampal neurogenesis and enhances behavioral performance on rotarod, contextual fear and water maze in rodents. To directly test whether intact neurogenesis is required for gains in behavioral performance from exercise in C57BL/6J mice, neurogenesis was reduced using focal gamma irradiation (3 sessions of 5 Gy). Two months after treatment, mice (total n=42 males and 42 females) (Irradiated or Sham), were placed with or without running wheels (Runner or Sedentary) for 54 days. The first 10 days mice received daily injections of bromodeoxyuridine (BrdU) to label dividing cells. The last 14 days mice were tested on water maze (two trials per day for 5 days, then 1 h later probe test), rotarod (four trials per day for 3 days), and contextual fear conditioning (2 days), then measured for neurogenesis using immunohistochemical detection of BrdU and neuronal nuclear protein (NeuN) mature neuronal marker. Consistent with previous studies, in Sham animals, running increased neurogenesis fourfold and gains in performance were observed for the water maze (spatial learning and memory), rotarod (motor performance), and contextual fear (conditioning). These positive results provided the reference to determine whether gains in performance were blocked by irradiation. Irradiation reduced neurogenesis by 50% in both groups, Runner and Sedentary. Irradiation did not affect running or baseline performance on any task. Minimal changes in microglia associated with inflammation (using immunohistochemical detection of cd68) were detected at the time of behavioral testing. Irradiation did not reduce gains in performance on rotarod or contextual fear, however it eliminated gain in performance on the water maze. Results support the hypothesis that intact exercise-induced hippocampal neurogenesis

  11. Autologous transplantation of bone marrow mononuclear cells improved heart function after myocardial infarction

    Institute of Scientific and Technical Information of China (English)

    Guo-sheng LIN; Jing-jun L(U); Xue-jun JIANG; Xiao-yan LI; Geng-shan LI

    2004-01-01

    AIM: To investigate whether autologous transplantation of adult stem cells could improve post-infarcted heart function. METHODS: Bone marrow mononuclear cells (MNCs) were isolated from adult rabbits' tibias after coronary ligation. These cells were exposed to 5-azacytidine 10 μmol/L for 24 h on the third day of culture. After being labeled with bromodeoxyuridine (BrdU), the cells were auto-transplanted into bordering zone of the infarcted area at 2 weeks after injury. The animals were killed at 3 days, 2 weeks, 1 month, and 2 months after transplantation,respectively. The left ventricular functions, capillary density, and cardiac nerve density were measured and the differentiation of the engrafted cells was determined by immunostaining. RESULTS: BrdU-labeled MNCs were well aligned with the host cardiomyocytes. Parts of them were incorporated into capillary and arteriolar vessel walls. In addition to inducing angiogenic ligands (basic fibroblast growth factor, vascular endothelial growth factor) and imflammation cytokines (interleukin 1-β) during the early period of MNCs implantation, MNCs induced 2.0-fold increase in capillary density as well. Moreover, GAP43-positive and TH-positive nerve density were markedly higher in the MNCs-treated groups than that in the non-treated hearts. Left ventricular ejection fraction,LV+dp/dt and LV-dp/dtmax were 47 %, 67 %, and 55 % in MNCs-treated heart respectively, which was higher than that of the control heart, whereas left ventricular end-diastolic volume, left ventricular end-diastolic diameter,and left ventricular end-diastolic pressure were 45 %, 22 %, and 50 % respectively in MNCs-treated heart, which was lower than that of the control heart at 2 months after cell transplantation. CONCLUSION: Autologous transplantation of MNCs induced angiogenesis and nerve sprouting and improved left ventricular diastolic function.

  12. Effects of gamma-radiation on cell growth, cycle arrest, death, and superoxide dismutase expression by DU 145 human prostate cancer cells

    Directory of Open Access Journals (Sweden)

    Vucic V.

    2006-01-01

    Full Text Available Gamma-irradiation (gamma-IR is extensively used in the treatment of hormone-resistant prostate carcinoma. The objective of the present study was to investigate the effects of 60Co gamma-IR on the growth, cell cycle arrest and cell death of the human prostate cancer cell line DU 145. The viability of DU 145 cells was measured by the Trypan blue exclusion assay and the 3(4,5-dimethylthiazol-2-yl-2,5,diphenyltetrazolium bromide test. Bromodeoxyuridine incorporation was used for the determination of cell proliferation. Cell cycle arrest and cell death were analyzed by flow cytometry. Superoxide dismutase (SOD, specifically CuZnSOD and MnSOD protein expression, after 10 Gy gamma-IR, was determined by Western immunoblotting analysis. gamma-IR treatment had a significant (P < 0.001 antiproliferative and cytotoxic effect on DU 145 cells. Both effects were time and dose dependent. Also, the dose of gamma-IR which inhibited DNA synthesis and cell proliferation by 50% was 9.7 Gy. Furthermore, gamma-IR induced cell cycle arrest in the G2/M phase and the percentage of cells in the G2/M phase was increased from 15% (control to 49% (IR cells, with a nonsignificant induction of apoptosis. Treatment with 10 Gy gamma-IR for 24, 48, and 72 h stimulated CuZnSOD and MnSOD protein expression in a time-dependent manner, approximately by 3- to 3.5-fold. These data suggest that CuZnSOD and MnSOD enzymes may play an important role in the gamma-IR-induced changes in DU 145 cell growth, cell cycle arrest and cell death.

  13. Are newborn rat-derived neural stem cells more sensitive to lead neurotoxicity?

    Institute of Scientific and Technical Information of China (English)

    Yan Ho Chan; Mingyong Gao; Wutian Wu

    2013-01-01

    Lead ion (Pb2+) has been proven to be a neurotoxin due to its neurotoxicity on mammalian nervous system, especially for the developing brains of juveniles. However, many reported studies involved the negative effects of Pb2+ on adult neural cells of humans or other mammals, only few of which have examined the effects of Pb2+ on neural stem cells. The purpose of this study was to reveal the biological effects of Pb2+ from lead acetate [Pb (CH3COO)2] on viability, proliferation and differentiation of neural stem cells derived from the hippocampus of newborn rats aged 7 days and adult rats aged 90 days, respectively. This study was carried out in three parts. In the first part, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay (MTT viability assay) was used to detect the effects of Pb2+ on the cell viability of passage 2 hippocampal neural stem cells after 200 μM Pb2+, followed by immunocytochemical staining with anti-bromodeoxyuridine to demonstrate the effects of Pb2+ on cell proliferation. In the last part, passage 2 hippocampal neural Immunocytochemical staining with anti-microtubule-associated protein 2 (a neuron marker), anti-glial fibrillary acidic protein (an astrocyte marker), and anti-RIP (an oligodendrocyte marker) was performed to detect the differentiation commitment of affected neural stem cells after 6 days. The data showed that Pb2+ inhibited not only the viability and proliferation of rat hippocampal neural stem cells, but also their neuronal and oligodendrocyte differentiation in vitro. Moreover, increased activity of astrocyte differentiation of hippocampal neural stem cells from both newborn and adult rats was observed after exposure to high concentration of lead ion in vitro. These findings suggest that hippocampal neural stem cells of newborn rats were more sensitive than those from adult rats to Pb2+ cytotoxicity.

  14. Electrocommunication signals alone are sufficient to increase neurogenesis in the brain of adult electric fish, Apteronotus leptorhynchus.

    Science.gov (United States)

    Dunlap, Kent D; McCarthy, Elizabeth A; Jashari, Denisa

    2008-10-01

    Social interaction can have profound influences on the structure of the adult brain, but little is known about the precise stimulus feature found within social interaction that induces such brain plasticity. We examined the effects of social stimuli on cell addition and radial glial fiber formation in the brains of adult electric fish. These fish communicate primarily through weak, quasi-sinusoidal electric signals. Fish were housed in isolation, paired with another fish or exposed to only the electrocommunication signals of another fish for 7 days. After 3 days of exposure to these stimulus conditions, fish were injected with bromodeoxyuridine (BrdU) to mark newborn cells. We sacrificed the fish 4 days after BrdU injection and used immunohistochemistry to measure cell addition (BrdU+), the fraction of added cells that differentiated into neurons (BrdU+/NeuroTrace+) and the density of radial glia fibers (vimentin+) in the periventricular zone of the diencephalon. Fish that were exposed only to the electrocommunication signals of another fish and no other social stimuli had equivalent levels of cell addition and radial glial fiber density to fish that were housed with full social interaction and higher levels than fish housed in isolation. About 60% of the added cells differentiated into neurons; this fraction did not differ among treatment groups. Artificial sine wave electrical stimuli that mimicked electrocommunication signals were ineffective in increasing cell addition and glia fiber formation above those found in isolated fish. Thus, stimuli through a single modality are sufficient for inducing this brain plasticity, but the waveform or dynamic features of communication signals are crucial for the effect.

  15. Sexual experience promotes adult neurogenesis in the hippocampus despite an initial elevation in stress hormones.

    Directory of Open Access Journals (Sweden)

    Benedetta Leuner

    Full Text Available Aversive stressful experiences are typically associated with increased anxiety and a predisposition to develop mood disorders. Negative stress also suppresses adult neurogenesis and restricts dendritic architecture in the hippocampus, a brain region associated with anxiety regulation. The effects of aversive stress on hippocampal structure and function have been linked to stress-induced elevations in glucocorticoids. Normalizing corticosterone levels prevents some of the deleterious consequences of stress, including increased anxiety and suppressed structural plasticity in the hippocampus. Here we examined whether a rewarding stressor, namely sexual experience, also adversely affects hippocampal structure and function in adult rats. Adult male rats were exposed to a sexually-receptive female once (acute or once daily for 14 consecutive days (chronic and levels of circulating glucocorticoids were measured. Separate cohorts of sexually experienced rats were injected with the thymidine analog bromodeoxyuridine in order to measure cell proliferation and neurogenesis in the hippocampus. In addition, brains were processed using Golgi impregnation to assess the effects of sexual experience on dendritic spines and dendritic complexity in the hippocampus. Finally, to evaluate whether sexual experience alters hippocampal function, rats were tested on two tests of anxiety-like behavior: novelty suppressed feeding and the elevated plus maze. We found that acute sexual experience increased circulating corticosterone levels and the number of new neurons in the hippocampus. Chronic sexual experience no longer produced an increase in corticosterone levels but continued to promote adult neurogenesis and stimulate the growth of dendritic spines and dendritic architecture. Chronic sexual experience also reduced anxiety-like behavior. These findings suggest that a rewarding experience not only buffers against the deleterious actions of early elevated

  16. Sexual activity increases the number of newborn cells in the accessory olfactory bulb of male rats.

    Directory of Open Access Journals (Sweden)

    Wendy ePortillo

    2012-07-01

    Full Text Available In rodents, sexual behavior depends on the adequate detection of sexually relevant stimuli. The olfactory bulb (OB is a region of the adult mammalian brain undergoing constant cell renewal by continuous integration of new granular and periglomerular neurons in the accessory (AOB and main (MOB olfactory bulbs. The proliferation, migration, survival, maturation, and integration of these new cells to the OB depend on the stimulus that the subjects received. We have previously shown that 15 days after females control (paced the sexual interaction an increase in the number of cells is observed in the AOB. No changes are observed in the number of cells when females are not allowed to control the sexual interaction. In the present study we investigated if in male rats sexual behavior increases the number of new cells in the OB. Male rats were divided in five groups: 1 males that did not receive any sexual stimulation, 2 males that were exposed to female odors, 3 males that mated for 1 h and could not pace their sexual interaction, 4 males that paced their sexual interaction and ejaculated 1 time and 5 males that paced their sexual interaction and ejaculated 3 times. All males received three injections of the DNA synthesis marker bromodeoxyuridine at 1h intervals, starting 1h before the beginning of the behavioral test. Fifteen days later, males were sacrificed and the brains were processed to identify new cells and to evaluate if they differentiated into neurons. The number of newborn cells increased in the granular cell layer (also known as the internal cell layer of the AOB in males that ejaculated one or three times controlling (paced the rate of the sexual interaction. Some of these new cells were identified as neurons. In contrast, no significant differences were found in the mitral cell layer (also known as the external cell layer and glomerular cell layer of the AOB. In addition, no significant differences were found between groups in the MOB in

  17. Short-term galvanic vestibular stimulation promotes functional recovery and neurogenesis in unilaterally labyrinthectomized rats.

    Science.gov (United States)

    Shaabani, Moslem; Lotfi, Yones; Karimian, Seyed Morteza; Rahgozar, Mehdi; Hooshmandi, Mehdi

    2016-10-01

    Current experimental research on the therapeutic effects of galvanic vestibular stimulation (GVS) has mainly focused on neurodegenerative disorders. However, it primarily stimulates the vestibular nuclei and could be potentially effective in modulating imbalance between them in the case of unilateral labyrinthectomy (UL). Fifty male Wistar rats (180-220g) were used in 5 groups of 10: intact, sham, right-UL (RUL; without intervention), and two other right-UL groups with GVS intervention [one group treated with low rate GVS (GVS.LF; 6-7Hz), and the other treated with high rate GVS (GVS.HF; 17-18Hz)]. The UL models were prepared by intratympanic injection of sodium arsanilate. GVS protocols were implemented 30min/day and continued for 14 days via ring-shaped copper electrodes inserted subcutaneously over each mastoid. Functional recovery was assessed by several postural tests including support surface area, landing and air-righting reflexes, and rotarod procedure. Immunohistochemical investigations were performed on ipsi- and contra-lesional medial vestibular nuclei (MVN) using bromodeoxyuridine (BrdU) and Ki67, as markers of cell proliferation. Behavioral evaluations showed significant functional recovery of GVS-treated groups compared to RUL group. The percent of marked cells with BrdU and Ki67 were significantly higher in the ipsilesional MVN of both GVS-treated groups compared with other groups. Our findings confirmed the effectiveness of GVS-intervention in accelerating static and dynamic vestibular compensation. This could be explained by the cell proliferation in ipsilesional MVN cells and rapid rebalancing of the VNs and the modulation of their motor outputs. Therefore, GVS could be promising for rehabilitating patients with unilateral vestibular weakness.

  18. Oncogenic Nras has bimodal effects on stem cells that sustainably increase competitiveness.

    Science.gov (United States)

    Li, Qing; Bohin, Natacha; Wen, Tiffany; Ng, Victor; Magee, Jeffrey; Chen, Shann-Ching; Shannon, Kevin; Morrison, Sean J

    2013-12-05

    'Pre-leukaemic' mutations are thought to promote clonal expansion of haematopoietic stem cells (HSCs) by increasing self-renewal and competitiveness; however, mutations that increase HSC proliferation tend to reduce competitiveness and self-renewal potential, raising the question of how a mutant HSC can sustainably outcompete wild-type HSCs. Activating mutations in NRAS are prevalent in human myeloproliferative neoplasms and leukaemia. Here we show that a single allele of oncogenic Nras(G12D) increases HSC proliferation but also increases reconstituting and self-renewal potential upon serial transplantation in irradiated mice, all prior to leukaemia initiation. Nras(G12D) also confers long-term self-renewal potential to multipotent progenitors. To explore the mechanism by which Nras(G12D) promotes HSC proliferation and self-renewal, we assessed cell-cycle kinetics using H2B-GFP label retention and 5-bromodeoxyuridine (BrdU) incorporation. Nras(G12D) had a bimodal effect on HSCs, increasing the frequency with which some HSCs divide and reducing the frequency with which others divide. This mirrored bimodal effects on reconstituting potential, as rarely dividing Nras(G12D) HSCs outcompeted wild-type HSCs, whereas frequently dividing Nras(G12D) HSCs did not. Nras(G12D) caused these effects by promoting STAT5 signalling, inducing different transcriptional responses in different subsets of HSCs. One signal can therefore increase HSC proliferation, competitiveness and self-renewal through bimodal effects on HSC gene expression, cycling and reconstituting potential.

  19. Upregulation of CENP-H in tongue cancer correlates with poor prognosis and progression

    Directory of Open Access Journals (Sweden)

    Weng Gui-Xiang

    2009-06-01

    Full Text Available Abstract Background Centromere protein H (CENP-H is one of the fundamental components of the human active kinetochore. Recently, CENP-H was identified to be associated with tumorigenesis. This study was aimed to investigate the clinicopathologic significance of CENP-H in tongue cancer. Methods RT-PCR, real time RT-PCR and Western blot were used to examine the expression of CENP-H in tongue cancer cell lines and biopsies. CENP-H protein level in paraffin-embedded tongue cancer tissues were tested by immunohistochemical staining and undergone statistical analysis. CENP-H-knockdown stable cell line was established by infecting cells with a retroviral vector pSuper-retro-CENP-H-siRNA. The biological function of CENP-H was tested by MTT assay, colony formation assay, and Bromodeoxyuridine (BrdU incorporation assay. Results CENP-H expression was higher in tongue cancer cell lines and cancer tissues (T than that in normal cell and adjacent noncancerous tongue tissues (N, respectively. It was overexpressed in 55.95% (94/168 of the paraffin-embedded tongue cancer tissues, and there was a strong correlation between CENP-H expression and clinical stage, as well as T classification. CENP-H can predict the prognosis of tongue cancer patients especially those in early stage. Depletion of CENP-H can inhibit the proliferation of tongue cancer cells (Tca8113 and downregulate the expression of Survivin. Conclusion These findings suggested that CENP-H involves in the development and progression of tongue cancer. CENP-H might be a valuable prognostic indicator for tongue cancer patients within early stage.

  20. CCR9-CCL25 interactions promote cisplatin resistance in breast cancer cell through Akt activation in a PI3K-dependent and FAK-independent fashion

    Directory of Open Access Journals (Sweden)

    Lillard James W

    2011-05-01

    Full Text Available Abstract Background Chemotherapy heavily relies on apoptosis to kill breast cancer (BrCa cells. Many breast tumors respond to chemotherapy, but cells that survive this initial response gain resistance to subsequent treatments. This leads to aggressive cell variants with an enhanced ability to migrate, invade and survive at secondary sites. Metastasis and chemoresistance are responsible for most cancer-related deaths; hence, therapies designed to minimize both are greatly needed. We have recently shown that CCR9-CCL25 interactions promote BrCa cell migration and invasion, while others have shown that this axis play important role in T cell survival. In this study we have shown potential role of CCR9-CCL25 axis in breast cancer cell survival and therapeutic efficacy of cisplatin. Methods Bromodeoxyuridine (BrdU incorporation, Vybrant apoptosis and TUNEL assays were performed to ascertain the role of CCR9-CCL25 axis in cisplatin-induced apoptosis of BrCa cells. Fast Activated Cell-based ELISA (FACE assay was used to quantify In situ activation of PI3Kp85, AktSer473, GSK-3βSer9 and FKHRThr24 in breast cancer cells with or without cisplatin treatment in presence or absence of CCL25. Results CCR9-CCL25 axis provides survival advantage to BrCa cells and inhibits cisplatin-induced apoptosis in a PI3K-dependent and focal adhesion kinase (FAK-independent fashion. Furthermore, CCR9-CCL25 axis activates cell-survival signals through Akt and subsequent glycogen synthase kinase-3 beta (GSK-3β and forkhead in human rhabdomyosarcoma (FKHR inactivation. These results show that CCR9-CCL25 axis play important role in BrCa cell survival and low chemotherapeutic efficacy of cisplatin primarily through PI3K/Akt dependent fashion.

  1. Proliferating Cellular Nuclear Antigen Expression as a Marker of Perivascular Macrophages in Simian Immunodeficiency Virus Encephalitis

    Science.gov (United States)

    Williams, Kenneth; Schwartz, Annette; Corey, Sarah; Orandle, Marlene; Kennedy, William; Thompson, Brendon; Alvarez, Xavier; Brown, Charlie; Gartner, Suzanne; Lackner, Andrew

    2002-01-01

    Brain perivascular macrophages are a major target of simian immunodeficiency virus (SIV) infection in rhesus macaques and HIV infection in humans. Perivascular macrophages are distinct from parenchymal microglia in their location, morphology, expression of myeloid markers, and turnover in the CNS. In contrast to parenchymal microglia, perivascular macrophages are continuously repopulated by blood monocytes, which undergo maturation to macrophages on entering the central nervous system (CNS). We studied differences in monocyte/macrophages in vivo that might account for preferential infection of perivascular macrophages by SIV. In situ hybridization for SIV and proliferating cellular nuclear antigen (PCNA) immunohistochemistry demonstrated that SIV-infected and PCNA-positive cells were predominantly found in perivascular cuffs of viremic animals and in histopathological lesions that characterize SIV encephalitis (SIVE) in animals with AIDS. Multilabel techniques including double-label immunohistochemistry and combined in situ hybridization and immunofluorescence confocal microscopy revealed numerous infected perivascular macrophages that were PCNA-positive. Outside the CNS, SIV-infected, PCNA-expressing macrophage subpopulations were found in the small intestine and lung of animals with AIDS. While PCNA is used as a marker of cell proliferation it is also strongly expressed in non-dividing cells undergoing DNA synthesis and repair. Therefore, more specific markers for cell proliferation including Ki-67, topoisomerase IIα, and bromodeoxyuridine (BrdU) incorporation were used which indicated that PCNA-positive cells within SIVE lesions were not proliferating. These observations are consistent with perivascular macrophages as terminally differentiated, non-dividing cells and underscores biological differences that could potentially define mechanisms of preferential, productive infection of perivascular macrophages in the rhesus macaque model of neuroAIDS. These studies

  2. beta-catenin is strongly elevated in rat colonic epithelium following short-term intermittent treatment with 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and a high-fat diet.

    Science.gov (United States)

    Wang, Rong; Dashwood, W Mohaiza; Löhr, Christiane V; Fischer, Kay A; Nakagama, Hitoshi; Williams, David E; Dashwood, Roderick H

    2008-09-01

    Colon tumors expressing high levels of beta-catenin and c-myc have been reported in male F344 rats given three short cycles of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) alternating with a high-fat (HF) diet. Using the same experimental protocol, rats were euthanized 24 h after the last dose of PhIP so as to examine early changes in colonic crypt homeostasis and beta-catenin expression, before the onset of frank tumors. PhIP/HF dosing caused a significant increase in the bromodeoxyuridine labeling index throughout the entire colon, and within the colonic crypt column cleaved caspase-3 was elevated in the basal and central zones, but reduced in the luminal region. In vehicle/HF controls, beta-catenin was immunolocalized primarily at the border between cells at the top of the crypt, whereas in rats given PhIP/HF diet there was strong cytoplasmic staining, which appeared as a gradient of increased beta-catenin extending from the base of the crypt column to the luminal region. Quantitative real-time PCR and immunoblot analyses confirmed that beta-catenin and c-myc were increased significantly in the colonic mucosa of rats given PhIP/HF diet. Collectively, these findings suggest that PhIP/HF cycling alters beta-catenin and c-myc expression in the colonic mucosa, resulting in expansion of the proliferative zone and redistribution of apoptotic cells from the lumen to the central and basal regions of the colonic crypt. Thus, during the early stages of colon carcinogenesis, alternating exposure to heterocyclic amines and a high-fat diet might facilitate molecular changes resulting in dysregulated beta-catenin and c-myc expression.

  3. Trapping DNA replication origins from the human genome.

    Science.gov (United States)

    Eki, Toshihiko; Murakami, Yasufumi; Hanaoka, Fumio

    2013-04-17

    Synthesis of chromosomal DNA is initiated from multiple origins of replication in higher eukaryotes; however, little is known about these origins' structures. We isolated the origin-derived nascent DNAs from a human repair-deficient cell line by blocking the replication forks near the origins using two different origin-trapping methods (i.e., UV- or chemical crosslinker-treatment and cell synchronization in early S phase using DNA replication inhibitors). Single-stranded DNAs (of 0.5-3 kb) that accumulated after such treatments were labeled with bromodeoxyuridine (BrdU). BrdU-labeled DNA was immunopurified after fractionation by alkaline sucrose density gradient centrifugation and cloned by complementary-strand synthesis and PCR amplification. Competitive PCR revealed an increased abundance of DNA derived from known replication origins (c-myc and lamin B2 genes) in the nascent DNA fractions from the UV-treated or crosslinked cells. Nucleotide sequences of 85 and 208 kb were obtained from the two libraries (I and II) prepared from the UV-treated log-phase cells and early S phase arrested cells, respectively. The libraries differed from each other in their G+C composition and replication-related motif contents, suggesting that differences existed between the origin fragments isolated by the two different origin-trapping methods. The replication activities for seven out of 12 putative origin loci from the early-S phase cells were shown by competitive PCR. We mapped 117 (library I) and 172 (library II) putative origin loci to the human genome; approximately 60% and 50% of these loci were assigned to the G-band and intragenic regions, respectively. Analyses of the flanking sequences of the mapped loci suggested that the putative origin loci tended to associate with genes (including conserved sites) and DNase I hypersensitive sites; however, poor correlations were found between such loci and the CpG islands, transcription start sites, and K27-acetylated histone H3 peaks.

  4. Gibberellic Acid enhancement of DNA turnover in barley aleurone cells.

    Science.gov (United States)

    Taiz, L; Starks, J E

    1977-08-01

    When imbibed, deembryonated halfseeds from barley (Hordeum vulgare L., var. Himalaya) are incubated in buffer, the DNA content of the aleurone layer increases 25 to 40% over a 24-hour period. In contrast, the DNA of isolated aleurone layers declines by 20% over the same time period. Gibberellic acid (GA) causes a reduction in DNA levels in both halfseed aleurone layers and isolated aleurone layers. GA also increases the specific radioactivity of [(3)H]thymidine-labeled halfseed aleurone layer DNA during the first 12 hours of treatment. Pulse-chase studies demonstrated that the newly synthesized DNA is metabolically labile.The buoyant density on CsCl density gradients of hormone-treated aleurone DNA is identical with that of DNA extracted from whole seedlings. After density-labeling halfseed DNA with 5-bromodeoxyuridine, a bimodal absorption profile is obtained in neutral CsCl. The light band (1.70 g/ml) corresponds to unsubstituted DNA, while the heavy band (1.725-1.74 g/ml) corresponds to a hybrid density-labeled species. GA increases the relative amount of the heavy (hybrid) peak in halfseed aleurone layer DNA, further suggesting that the hormone enhances semiconservative replication in halfseeds.DNA methylation was also demonstrated. Over 60% of the radioactivity from [(3)H-Me]methionine is incorporated into 5-methylcytosine. GA has no effect on the percentage distribution of label among the bases.It was concluded that GA enhances the rate of DNA degradation and DNA synthesis (turnover) in halfseeds, but primarily DNA degradation in isolated aleurone layers. Incorporation by isolated aleurone layers is due to DNA repair. Semiconservative replication apparently plays no physiological role in the hormone response, since both isolated aleurone layers and gamma-irradiated halfseeds respond normally. The hypothesis was advanced that endoreduplication and DNA degradation are means by which the seed stores and mobilizes deoxyribonucleotides for the embryo during

  5. Indirect radio-chemo-beta therapy: a targeted approach to increase biological efficiency of x-rays based on energy.

    Science.gov (United States)

    Oktaria, Sianne; Corde, Stéphanie; Lerch, Michael L F; Konstantinov, Konstantin; Rosenfeld, Anatoly B; Tehei, Moeava

    2015-10-21

    Despite the use of multimodal treatments incorporating surgery, chemotherapy and radiotherapy, local control of gliomas remains a major challenge. The potential of a new treatment approach called indirect radio-chemo-beta therapy using the synergy created by combining methotrexate (MTX) with bromodeoxyuridine (BrUdR) under optimum energy x-ray irradiation is assessed. 9L rat gliosarcoma cells pre-treated with 0.01 μM MTX and/or 10 μM BrUdR were irradiated in vitro with 50 kVp, 125 kVp, 250 kVp, 6 MV and 10 MV x-rays. The cytotoxicity was assessed using clonogenic survival as the radiobiological endpoint. The photon energy with maximum effect was determined using radiation sensitization enhancement factors at 10% clonogenic survival (SER10%). The cell cycle distribution was investigated using flow cytometric analysis with propidium iodide staining. Incorporation of BrUdR in the DNA was detected by the fluorescence of labelled anti-BrUdR antibodies. The radiation sensitization enhancement exhibits energy dependence with a maximum of 2.3 at 125 kVp for the combined drug treated cells. At this energy, the shape of the clonogenic survival curve of the pharmacological agents treated cells changes substantially. This change is interpreted as an increased lethality of the local radiation environment and is attributed to supplemented inhibition of DNA repair. Radiation induced chemo-beta therapy was demonstrated in vitro by the targeted activation of combined pharmacological agents with optimized energy tuning of x-ray beams on 9 L cells. Our results show that this is a highly effective form of chemo-radiation therapy.

  6. Effect of adrenotensin on cell proliferation is mediated by angiotensin Ⅱ in cultured rat mesangial cells

    Institute of Scientific and Technical Information of China (English)

    Hong XUE; Ping YUAN; Li ZHOU; Tai YAO; Yu HUANG; Li-min LU

    2009-01-01

    Aim: Both adrenomedullin (ADM) and adrenotensin (ADT) are derived from the same propeptide precursor, and both act as circulat- ing hormones and local paracrine mediators with multiple biological activities. Compared with ADM, little is known about how ADT achieves its functions. In the present study, we investigated the effect of ADT on cell proliferation and transforming growth factor-β (TGF-β) secretion in cultured renal mesangial cells (MCs) and determined whether angiotensin Ⅱ (Ang Ⅱ) was involved in mediating this process.Methods: Cell proliferation was measured by bromodeoxyuridine (BrdU) incorporation assay, Ang Ⅱ levels were assayed using an enzyme immunoassay, and real time PCR was used to measure Ang Ⅱ type 1 (AT1) receptor, Ang Ⅱ type 2 (AT2) receptor, angiotensino-gen (AGT), renin, angiotensin converting enzyme (ACE) and TGF-β1 mRNA levels. TGF-β1 and collagen type IV protein levels in cellmedia were measured using enzyme-linked immunoassays. Results: ADT treatment induced cell proliferation in a concentration-dependent manner; it also increased the levels of TGF-β1 mRNA and protein as well as collagen type Ⅳ excretion by cultured MCs. ADT treatment increased renin and AGT mRNAs as well as Ang Ⅱ protein, but did not affect the ACE mRNA level. ADT up-regulated angiotensin AT1 receptor mRNA, but not that of the AT2 receptor. The angiotensin AT1 receptor antagonist Iosartan blocked the effects of ADT-induced cell proliferation, TGF-β1 and collagen type Ⅳ synthe-sis and secretion.Conclusion: ADT has a stimulating role in cell proliferation in cultured MCs. Increases in the levels of Ang II and the AT1 receptor after ADT treatment mediate the stimulating effects of ADT on cell proliferation and extracellular matrix synthesis and secretion.

  7. EdU induces DNA damage response and cell death in mESC in culture.

    Science.gov (United States)

    Kohlmeier, Fanni; Maya-Mendoza, Apolinar; Jackson, Dean A

    2013-03-01

    Recently, a novel DNA replication precursor analogue called 5-ethynyl-2'-deoxyuridine (EdU) has been widely used to monitor DNA synthesis as an alternative to bromodeoxyuridine. Use of EdU benefits from simplicity and reproducibility and the simple chemical detection systems allows excellent preservation of nuclear structure. However, the alkyne moiety is highly reactive, raising the possibility that incorporation might compromise genome stability. To assess the extent of possible DNA damage, we have analysed the effect of EdU incorporation into DNA during short- and long-term cell culture using a variety of cell lines. We show that EdU incorporation has no measurable impact on the rate of elongation of replication forks during synthesis. However, using different cell lines we find that during long-term cell culture variable responses to EdU incorporation are seen, which range from delayed cell cycle progression to complete cell cycle arrest. The most profound phenotypes were seen in mouse embryonic stem cells, which following incorporation of EdU accumulated in the G2/M-phase of the cell cycle before undergoing apoptosis. In long-term cell culture, EdU incorporation also triggered a DNA damage response in all cell types analysed. Our study shows that while EdU is extremely useful to tag sites of on-going replication, for long-term studies (i.e. beyond the cell cycle in which labelling is performed), a careful analysis of cell cycle perturbations must be performed in order to ensure that any conclusions made after EdU treatment are not a direct consequence of EdU-dependent activation of cell stress responses.

  8. Ethynyldeoxyuridine (EdU) suppresses in vitro population expansion and in vivo tumor progression of human glioblastoma cells.

    Science.gov (United States)

    Ross, Heather H; Rahman, Maryam; Levkoff, Lindsay H; Millette, Sebastien; Martin-Carreras, Teresa; Dunbar, Erin M; Reynolds, Brent A; Laywell, Eric D

    2011-12-01

    Thymidine analogs (TAs) are synthetic nucleosides that incorporate into newly synthesized DNA. Halogenated pyrimidines (HPs), such as bromodeoxyuridine (BrdU), are a class of TAs that can be detected with antibodies and are commonly used for birthdating individual cells and for assessing the proliferative index of cell populations. It is well established that HPs can act as radiosensitizers when incorporated into DNA chains, but they are generally believed not to impair normal cell function in the absence of secondary stressors. However, we and others have shown that HP incorporation leads to a sustained suppression of cell cycle progression in mammalian cells, resulting in cellular senescence in somatic cells. In addition, we have shown that HP incorporation results in delayed tumor progression in a syngeneic rat model of glioma. Here we examine ethynyldeoxyuridine (EdU), a newly developed and alkylated TA, for its anti-cancer activity, both in vitro and in vivo. We show that EdU, like HPs, leads to a severe reduction in the proliferation rate of normal and transformed cells in vitro. Unlike HPs, however, EdU incorporation also causes DNA damage resulting in the death of a substantial subset of treated cells. When administered over an extended time as a monotherapy to mice bearing subcutaneous xenografts of human glioblastoma multiforme tumors, EdU significantly reduces tumor volume and increases survival without apparent significant toxicity. These results, combined with the fact that EdU readily crosses the blood-brain barrier, support the continued investigation of EdU as a potential therapy for malignant brain tumors.

  9. A rapid and robust assay for detection of S-phase cell cycle progression in plant cells and tissues by using ethynyl deoxyuridine

    Directory of Open Access Journals (Sweden)

    Horváth Gábor V

    2010-01-01

    Full Text Available Abstract Background Progress in plant cell cycle research is highly dependent on reliable methods for detection of cells replicating DNA. Frequency of S-phase cells (cells in DNA synthesis phase is a basic parameter in studies on the control of cell division cycle and the developmental events of plant cells. Here we extend the microscopy and flow cytometry applications of the recently developed EdU (5-ethynyl-2'-deoxyuridine-based S-phase assay to various plant species and tissues. We demonstrate that the presented protocols insure the improved preservation of cell and tissue structure and allow significant reduction in assay duration. In comparison with the frequently used detection of bromodeoxyuridine (BrdU and tritiated-thymidine incorporation, this new methodology offers several advantages as we discuss here. Results Applications of EdU-based S-phase assay in microscopy and flow cytometry are presented by using cultured cells of alfalfa, Arabidopsis, grape, maize, rice and tobacco. We present the advantages of EdU assay as compared to BrdU-based replication assay and demonstrate that EdU assay -which does not require plant cell wall digestion or DNA denaturation steps, offers reduced assay duration and better preservation of cellular, nuclear and chromosomal morphologies. We have also shown that fast and efficient EdU assay can also be an efficient tool for dual parameter flow cytometry analysis and for quantitative assessment of replication in thick root samples of rice. Conclusions In plant cell cycle studies, EdU-based S-phase detection offers a superior alternative to the existing S-phase assays. EdU method is reliable, versatile, fast, simple and non-radioactive and it can be readily applied to many different plant systems.

  10. MicroRNA-181b negatively regulates the proliferation of human epidermal keratinocytes in psoriasis through targeting TLR4.

    Science.gov (United States)

    Feng, Cheng; Bai, Ming; Yu, Nan-Ze; Wang, Xiao-Jun; Liu, Zeng

    2017-02-01

    Our study aims to explore the role of microRNA-181b (miR-181b) and TLR in the regulation of cell proliferation of human epidermal keratinocytes (HEKs) in psoriasis. Twenty-eight patients diagnosed with psoriasis vulgaris were selected as a case group with their lesional and non-lesional skin tissues collected. A control group consisted of 20 patients who underwent plastic surgery with their healthy skin tissues collected. Real-time quantitative fluorescence polymerase chain reaction (RT-qPCR), in situ hybridization and immunohistochemistry were used to detect the expressions of miR-181b and TLR4 in HEKs of healthy skin, psoriatic lesional skin and non-lesional skin respectively. The 3' untranslated region (3'UTR) of TLR4 combined with miR-181b was verified by a dual-luciferase reporter assay. Western blotting and bromodeoxyuridine were applied for corresponding detection of TLR4 expression and cell mitosis. The expression of miR-181b in HEKs of psoriatic lesional skin was less than healthy skin and psoriatic non-lesional skin. In psoriatic lesional and non-lesional skin, TLR4-positive cell rates and the number of positive cells per square millimetre were higher than healthy skin. The dual-luciferase reporter assay verified that miR-181b targets TLR4. HEKs transfected with miR-181b mimics had decreased expression of TLR4, along with the decrease of mitotic indexes and Brdu labelling indexes. However, HEKs transfected with miR-181b inhibitors showed increased TLR4 expression, mitotic indexes and Brdu labelling indexes. HEKs transfected with both miR-181b inhibitors and siTLR4 had decreased mitotic indexes and Brdu labelling indexes. These results indicate that miR-181b can negatively regulate the proliferation of HEKs in psoriasis by targeting TLR4.

  11. Mesenchymal stem cells transfer mitochondria to the cells with virtually no mitochondrial function but not with pathogenic mtDNA mutations.

    Science.gov (United States)

    Cho, Young Min; Kim, Ju Han; Kim, Mingoo; Park, Su Jin; Koh, Sang Hyeok; Ahn, Hyo Seop; Kang, Gyeong Hoon; Lee, Jung-Bin; Park, Kyong Soo; Lee, Hong Kyu

    2012-01-01

    It has been reported that human mesenchymal stem cells (MSCs) can transfer mitochondria to the cells with severely compromised mitochondrial function. We tested whether the reported intercellular mitochondrial transfer could be replicated in different types of cells or under different experimental conditions, and tried to elucidate possible mechanism. Using biochemical selection methods, we found exponentially growing cells in restrictive media (uridine(-) and bromodeoxyuridine [BrdU](+)) during the coculture of MSCs (uridine-independent and BrdU-sensitive) and 143B-derived cells with severe mitochondrial dysfunction induced by either long-term ethidium bromide treatment or short-term rhodamine 6G (R6G) treatment (uridine-dependent but BrdU-resistant). The exponentially growing cells had nuclear DNA fingerprint patterns identical to 143B, and a sequence of mitochondrial DNA (mtDNA) identical to the MSCs. Since R6G causes rapid and irreversible damage to mitochondria without the removal of mtDNA, the mitochondrial function appears to be restored through a direct transfer of mitochondria rather than mtDNA alone. Conditioned media, which were prepared by treating mtDNA-less 143B ρ(0) cells under uridine-free condition, induced increased chemotaxis in MSC, which was also supported by transcriptome analysis. Cytochalasin B, an inhibitor of chemotaxis and cytoskeletal assembly, blocked mitochondrial transfer phenomenon in the above condition. However, we could not find any evidence of mitochondrial transfer to the cells harboring human pathogenic mtDNA mutations (A3243G mutation or 4,977 bp deletion). Thus, the mitochondrial transfer is limited to the condition of a near total absence of mitochondrial function. Elucidation of the mechanism of mitochondrial transfer will help us create a potential cell therapy-based mitochondrial restoration or mitochondrial gene therapy for human diseases caused by mitochondrial dysfunction.

  12. Mesenchymal stem cells transfer mitochondria to the cells with virtually no mitochondrial function but not with pathogenic mtDNA mutations.

    Directory of Open Access Journals (Sweden)

    Young Min Cho

    Full Text Available It has been reported that human mesenchymal stem cells (MSCs can transfer mitochondria to the cells with severely compromised mitochondrial function. We tested whether the reported intercellular mitochondrial transfer could be replicated in different types of cells or under different experimental conditions, and tried to elucidate possible mechanism. Using biochemical selection methods, we found exponentially growing cells in restrictive media (uridine(- and bromodeoxyuridine [BrdU](+ during the coculture of MSCs (uridine-independent and BrdU-sensitive and 143B-derived cells with severe mitochondrial dysfunction induced by either long-term ethidium bromide treatment or short-term rhodamine 6G (R6G treatment (uridine-dependent but BrdU-resistant. The exponentially growing cells had nuclear DNA fingerprint patterns identical to 143B, and a sequence of mitochondrial DNA (mtDNA identical to the MSCs. Since R6G causes rapid and irreversible damage to mitochondria without the removal of mtDNA, the mitochondrial function appears to be restored through a direct transfer of mitochondria rather than mtDNA alone. Conditioned media, which were prepared by treating mtDNA-less 143B ρ(0 cells under uridine-free condition, induced increased chemotaxis in MSC, which was also supported by transcriptome analysis. Cytochalasin B, an inhibitor of chemotaxis and cytoskeletal assembly, blocked mitochondrial transfer phenomenon in the above condition. However, we could not find any evidence of mitochondrial transfer to the cells harboring human pathogenic mtDNA mutations (A3243G mutation or 4,977 bp deletion. Thus, the mitochondrial transfer is limited to the condition of a near total absence of mitochondrial function. Elucidation of the mechanism of mitochondrial transfer will help us create a potential cell therapy-based mitochondrial restoration or mitochondrial gene therapy for human diseases caused by mitochondrial dysfunction.

  13. E series prostaglandins alter the proliferative, apoptotic and migratory properties of T98G human glioma cells in vitro

    Directory of Open Access Journals (Sweden)

    Gomes Renata N

    2012-12-01

    Full Text Available Abstract Background In many types of cancer, prostaglandin E2 (PGE2 is associated with tumour related processes including proliferation, migration, angiogenesis and apoptosis. However in gliomas the role of this prostanoid is poorly understood. Here, we report on the proliferative, migratory, and apoptotic effects of PGE1, PGE2 and Ibuprofen (IBP observed in the T98G human glioma cell line in vitro. Methods T98G human glioma cells were treated with IBP, PGE1 or PGE2 at varying concentrations for 24–72 hours. Cell proliferation, mitotic index and apoptotic index were determined for each treatment. Caspase-9 and caspase-3 activity was measured using fluorescent probes in live cells (FITC-LEHD-FMK and FITC-DEVD-FMK respectively. The migratory capacity of the cells was quantified using a scratch migration assay and a transwell migration assay. Results A significant decrease was seen in cell number (54% in the presence of 50 μM IBP. Mitotic index and bromodeoxyuridine (BrdU incorporation were also decreased 57% and 65%, respectively, by IBP. The apoptotic index was increased (167% and the in situ activity of caspase-9 and caspase-3 was evident in IBP treated cells. The inhibition of COX activity by IBP also caused a significant inhibition of cell migration in the monolayer scratch assay (74% and the transwell migration assay (36%. In contrast, the presence of exogenous PGE1 or PGE2 caused significant increases in cell number (37% PGE1 and 45% PGE2. When mitotic index was measured no change was found for either PG treatment. However, the BrdU incorporation rate was significantly increased by PGE1 (62% and to a greater extent by PGE2 (100%. The apoptotic index was unchanged by exogenous PGs. The addition of exogenous PGs caused an increase in cell migration in the monolayer scratch assay (43% PGE1 and 44% PGE2 and the transwell migration assay (28% PGE1 and 68% PGE2. Conclusions The present study demonstrated that treatments which alter PGE1 and PGE

  14. The Success of Thread-embedding Therapy in Generating Hair Re-growth in Mice Points to Its Possibly Having a Similar Effect in Humans

    Directory of Open Access Journals (Sweden)

    Hyun Jong Shin

    2015-12-01

    Full Text Available Objectives: Recently, thread-embedding therapy (TET has been widely applied in Korean medicine for cosmetic purposes such as reducing skin wrinkles. An inserted thread was reported to have induced continuous stimulation, followed by support for connective tissue regeneration. However, the potential role of TET in hairgrowth has not yet been reported. Methods: We designed this study to evaluate whether TET has a hair-growth-promoting effect. C57 black 6 (C57BL/6 mice were divided into three groups: normal saline-treated, minoxidil-treated, and thread-embedded groups. Normal saline or 5% minoxidil was topically sprayed on the dorsal skin of the mice once a day for 16 days. Medical threads were embedded into the dorsal skin of the mice in a single application. Hair growth activity was evaluated by using dermoscopic and microscopic observations. Sections of the dorsal skin were stained with hematoxylin and eosin. Expressions of bromodeoxyuridine (BrdU, proliferating cell nuclear antigen (PCNA, fibroblast growth factor-7 (FGF-7, and fibroblast growth factor-5 (FGF-5 were detected by using immunohistochemical staining. A reverse transcription-polymerase chain reaction (RT-PCR analysis was adopted to measure the messenger RNA (mRNA expressions of FGF-7 and FGF-5. Results: TET enhanced anagen development in the hair follicles of C57BL/6 mice. The expressions of BrdU and PCNA, both of which imply active cellular proliferation, were increased by using TET. Moreover, TET increased the expression of FGF-7, an anagen-inducing growth factor, while decreasing the expression of FGF-5, an anagen-cessation growth factor, both at the protein and the mRNA levels. Conclusion: TET enhanced hair re-growth in C57BL/6 mice. TET regulated the expressions of anagen-associated growth factors and activated the proliferation of hair follicular cells in depilated skin lesions. Considering its long-lasting effect, TET may be a good alternative therapeutic for the treatment of

  15. The forkhead transcription factor FOXO3a controls microglial inflammatory activation and eventual apoptotic injury through caspase 3.

    Science.gov (United States)

    Shang, Yan Chen; Chong, Zhao Zhong; Hou, Jinling; Maiese, Kenneth

    2009-02-01

    Memory loss and cognitive failure are increasingly being identified as potential risks with the recognized increase in life expectancy of the general population. As a result, the development of novel therapeutic strategies for disorders such as Alzheimer's disease have garnered increased attention. The etiologies that can lead to Alzheimer's disease are extremely varied, but a number of therapeutic options are directed against amyloid-beta peptide and inflammatory cell regulation to prevent or halt progressive cognitive loss. In particular, inflammatory microglial cells may have disparate functions that in some scenarios lead to disability through the removal of functional neurovascular cells and in other circumstances foster tissue repair. Given the significance microglial cells hold for neurodegenerative disorders, we therefore examined the function that amyloid (Abeta(1-42)) has upon the microglial cell line EOC 2 and identified a novel role for the forkhead transcription factor FoxO3a and caspase 3. Here we show that Abeta(1-42) leads to progressive injury and apoptotic cell loss in microglial cells that involves both early phosphatidylserine (PS) externalization and late genomic DNA fragmentation over a 24 hour course. Prior to these injury programs, Abeta(1-42) results in the activation and proliferation of microglia as demonstrated by increased proliferating cell nuclear antigen (PCNA) expression and bromodeoxyuridine (BrdU) uptake. Both apoptotic injury as well as the prior activation and proliferation of microglial cells relies upon the presence of FoxO3a, since specific gene silencing of FoxO3a promotes microglial cell protection and prevents the early activation and proliferation of these cells. Furthermore, Abeta(1-42) exposure maintained FoxO3a in an unphosphorylated "active" state and facilitated the cellular trafficking of FoxO3a from the cytoplasm to the cell nucleus to potentially lead to "pro-apoptotic" programs by this transcription factor. One

  16. Neurogenesis by Activation of Inherent Neural Stem Cells in the Rat Hippocampus after Cerebral Infarction

    Institute of Scientific and Technical Information of China (English)

    Bo Zhang; Ren-zhi Wang; Zhi-gang Lian; Yang Song; Yong Yao

    2009-01-01

    Objective To investigate the changes of neural stem cells (NSCs) in the rat hippocampus after cerebral infarction (CI) and to evaluate the neurogenesis caused by the activation of NSCs. Methods CI models of rats were made and rats were assigned to 6 groups: sham-operated, 1 day, 3 days, 7 days, 14 days, and 28 days after CI. The dynamic expression of bromodeoxyuridine (BrdU), polysialylated neural cell adhesion molecule (PSA-NCAM), glial fibrillary acidic protein (GFAP), and neuronal nuclear antigen (NeuN) were determined by immunohistochemistry and immunofluorescence staining. BrdU was used to mark the proliferated NSCs. PSA-NCAM was used to mark the plasticity of activated NSCs. GFAP and NeuN were used to mark the differentiated NSCs. Results Compared with the controls, the number of BrdU+ cells in the hippocampus increased significantly at 1 day after CI (P < 0.05), reached peak at 7 days after CI (P < 0.05), decreased but still elevated compared with the controls at 14 days after CI (P < 0.05), and nearly unchanged at 28 days after CI. The number of BrdU+/PSA-NCAM+ cells increased significantly at 7 days after CI (P < 0.05), reached peak at 14 days after CI (P < 0.05), and decreased but still elevated compared with the controls at 28 days after CI (P < 0.05). The number of BrdU+/PSA-NCAM+ cells was equal to 60% of the number of BrdU+ cells in all the same period. The number of BrdU+/NeuN+ cells in the hippocampus increased significantly at 14 days after CI (P < 0.05) and reached peak at 28 day after CI (P < 0.05). The number of BrdU+/GFAP+cells in the hippocampus nearly unchanged after CI. Conclusion CI can stimulate the proliferation of inherent NSCs, and most proliferated NSCs may differentiate into neurons and represent neural plasticity.

  17. Correlation between thyroid hormone status and hepatic hyperplasia and hypertrophy caused by the peroxisome proliferator-activated receptor alpha agonist Wy-14,643

    Directory of Open Access Journals (Sweden)

    Wang C

    2004-05-01

    Full Text Available Abstract Background The metabolic inhibitor rotenone inhibits hepatocellular proliferation and the incidence of liver cancer resulting from exposure to the PPARα agonist Wy-14,643, via unknown mechanisms. Since the absence of thyroid hormones diminishes hepatomegaly, an early biomarker for the hepatocarcinogenicity induced by PPARα agonists, this study was undertaken to investigate whether rotenone might interference with the ability of Wy-14,643 to alter the animal thyroid status. Methods Male B6C3F1 mice were given Wy-14,643 (100 ppm, rotenone (600 ppm or a mixture of both, in the feed for 7 days. Bromodeoxyuridine (BrDU, marker of cell replication, was delivered through subcutaneously implanted osmotic mini-pumps. At the end of the experiment, sera were collected and corticosterone and thyroid hormone levels were measured by solid-phase radioimmunoassay kits. In addition, liver tissue samples were stained immunohistochemically for BrDU to determine percentages of labeled cells. Further, cell surface area was determined from images generated by a Zeiss Axioplan microscope equipped with a plan Neofluar ×40 0.75 na objective. Tracings of individual hepatocyte perimeters were then analyzed and cell-surface areas were calculated using MicroMeasure FL-4000. Results Wy-14,643 caused a significant increase in liver weights, hepatocyte BrDU labeling index (LI, and hepatocyte surface area. In animals which received both Wy-14,643 and rotenone simultaneously, all of these effects were significantly less pronounced compared with mice that received Wy-14,643 alone. Rotenone alone decreased liver weights, LI and surface area. The Free Thyroid Index (FTI, which provides an accurate reflection of the animal's thyroid status, was 5.0 ± 0.3 in control mice. In animals exposed to rotenone, these values decreased to 2.0 ± 0.9, but in animals which received Wy-14,643, levels increased significantly to 7.7 ± 0.9. FTI values decreased to 3.4 ± 0.8 in mice

  18. CCL2/MCP-1 modulation of microglial activation and proliferation

    Directory of Open Access Journals (Sweden)

    Garcia-Bueno Borja

    2011-07-01

    Full Text Available Abstract Background Monocyte chemoattractant protein (CCL2/MCP-1 is a chemokine that attracts cells involved in the immune/inflammatory response. As microglia are one of the main cell types sustaining inflammation in brain, we proposed here to analyze the direct effects of MCP-1 on cultured primary microglia. Methods Primary microglia and neuronal cultures were obtained from neonatal and embryonic Wistar rats, respectively. Microglia were incubated with different concentrations of recombinant MCP-1 and LPS. Cell proliferation was quantified by measuring incorporation of bromodeoxyuridine (BrdU. Nitrite accumulation was measured using the Griess assay. The expression and synthesis of different proteins was measured by RT-PCR and ELISA. Cell death was quantified by measuring release of LDH into the culture medium. Results MCP-1 treatment (50 ng/ml, 24 h did not induce morphological changes in microglial cultures. Protein and mRNA levels of different cytokines were measured, showing that MCP-1 was not able to induce proinflammatory cytokines (IL-1β, IL6, MIP-1α, either by itself or in combination with LPS. A similar lack of effect was observed when measuring inducible nitric oxide synthase (NOS2 expression or accumulation of nitrites in the culture media as a different indicator of microglial activation. MCP-1 was also unable to alter the expression of different trophic factors that were reduced by LPS treatment. In order to explore the possible release of other products by microglia and their potential neurotoxicity, neurons were co-cultured with microglia: no death of neurons could be detected when treated with MCP-1. However, the presence of MCP-1 induced proliferation of microglia, an effect opposite to that observed with LPS. Conclusion These data indicate that, while causing migration and proliferation of microglia, MCP-1 does not appear to directly activate an inflammatory response in this cell type, and therefore, other factors may be

  19. Polo-like kinase 1, a new therapeutic target in hepatocellular carcinoma

    Institute of Scientific and Technical Information of China (English)

    Wei Chuen Mok; Shanthi Wasser; Theresa Tan; Seng Gee Lim

    2012-01-01

    AIM:To investigate the role of polo-like kinase 1 (PLK1)as a therapeutic target for hepatocellular carcinoma (HCC).METHODS:PLK1 gene expression was evaluated in HCC tissue and HCC cell lines.Gene knockdown with short-interfering RNA (siRNA) was used to study PLK1 gene and protein expression using real-time reverse transcription polymerase chain reaction (RT-PCR) and Western blotting,and cell proliferation using 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2(4-sulfophenyl)-2H-tetrazolium (MTS) and bromodeoxyuridine(BrdU) assays.Apoptosis was evaluated using the terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay,and caspase-inhibition assay.Huh-7cells were transplanted into nude mice and co-cultured with PLK1 siRNA or control siRNA,and tumor progression was compared with controls.RESULTS:RT-PCR showed that PLK1 was overexpressed 12-fold in tumor samples compared with controls,and also was overexpressed in Huh-7 cells.siRNA against PLK1 showed a reduction in PLK1 gene and protein expression of up to 96% in Huh-7 cells,and areduction in cell proliferation by 68% and 92% in MTS and BrdU cell proliferation assays,respectively.There was a 3-fold increase in apoptosis events,and TUNEL staining and caspase-3 assays suggested that this was caspase-independent.The pan-caspase inhibitor Z-VAD-FMK was unable to rescue the apoptotic cells.Immnofluorescence co-localized endonuclease-G to fragmented chromosomes,implicating it in apoptosis.Huh-7 cells transplanted subcutaneously into nude mice showed tumor regression in siPLK1-treated mice,but not in controls.CONCLUSION:Knockdown of PLK1 overexpression in HCC was shown to be a potential therapeutic target,leading to apoptosis through the endonuclease-G pathway.

  20. Control of Vascular Smooth Muscle Cell Growth by Connexin 43

    Directory of Open Access Journals (Sweden)

    Chintamani eJoshi

    2012-06-01

    Full Text Available Connexin 43 (Cx43, the principal gap junction protein in vascular smooth muscle cells (VSMCs, regulates movement of ions and other signaling molecules through gap junction intercellular communication (GJIC and plays important roles in maintaining normal vessel function; however, many of the signaling mechanisms controlling Cx43 in VSMCs are not clearly described. The goal of this study was to investigate mechanisms of Cx43 regulation with respect to VSMC proliferation. Treatment of rat primary VSMCs with the cAMP analog 8Br-cAMP, the soluble guanylate cyclase (sGC stimulator BAY 41-2272 (BAY, or the Cx inducer diallyl disulfide (DADS significantly reduced proliferation after 72 h compared to vehicle controls. Bromodeoxyuridine uptake revealed reduction (p<.001 in DNA synthesis after 6 h and flow cytometry showed reduced (40% S phase cell numbers after 16 h in DADS-treated cells compared to controls. Cx43 expression significantly increased after 270 min treatment with 8Br-cAMP, 8Br-cGMP, BAY or DADS. Inhibition of PKA, PKG or PKC reversed 8Br-cAMP-stimulated increases in Cx43 expression, whereas only PKG or PKC inhibition reversed 8Br-cGMP- and BAY-stimulated increases in total Cx43. Interestingly, stimulation of Cx43 expression by DADS was not dependent on PKA, PKG or PKC. Using fluorescence recovery after photobleaching, only 8Br-cAMP or DADS increased GJIC with 8Br-cAMP mediated by PKC and DADS mediated by PKG. Further, DADS significantly increased phosphorylation at the MAPK-sensitive serine (Ser255 and Ser279, the cell cycle regulatory kinase-sensitive Ser262 and the PKC-sensitive Ser368 after 30 min while 8Br-cAMP significantly increased phosphorylation only at Ser279 compared to controls. This study demonstrates that 8Br-cAMP- and DADS-enhanced GJIC rather than Cx43 expression and/or phosphorylation plays an important role in regulation of VSMC proliferation and provides new insights into the growth-regulatory capacities of Cx43 in VSMCs.

  1. Quantitative study on morphologic features and proliferative activity during DEN-induced hepatocarcinogenesis in rats%DEN诱发大鼠肝癌变的病理形态与细胞增殖活性的定量研究

    Institute of Scientific and Technical Information of China (English)

    张新立; 史景泉; 卞修武

    2001-01-01

    目的 探讨大鼠肝癌变的形态演变和细胞增殖活性的关系。方法 通过DEN诱发启动模型和肝癌模型,采用图像分析技术,对病变细胞的形态进行测量,以PCNA和BrdU免疫组化结果反映细胞增殖活性。结果 形态测量证实卵圆细胞是一大小仅为正常肝细胞的1/8、核浆比却大6倍、形态不规则的增生小细胞;增生灶/结节嗜碱性肝细胞形态参数与肝癌细胞相似;PCNA和BrdU阳性细胞主要位于癌前增生灶及肝癌组织中;并且病变形态与细胞增殖活性有较好的一致性。结论 大鼠肝癌变的形态演变与细胞增殖活性密切相关。%Objective To explore the relationship between morphologic evolution and proliferative activity during hepatocarcinogenesis in rats. Methods Imaging analysis technique was used to detect the morphologic parameters of cells in hepatic lesions in both Solt-Farber model and diethylnitrosamine (DEN)-induced liver cancer model. Immunohistochemistry was employed to detect proliferating cell nuclear antigen (PCNA) and bromodeoxyuridine (BrdU). Results The oval cells were identified as irregular small proliferating cells in size of one-eighth of and with a nucleus/cytoplasm ratio of 6 times of the normal hepatocyte by image analysis. The morphometric parameters of basophil hepatocyte in precancerous foci and nodule were similar to those of the liver cancer cell. PCNA and BrdU positive cells were mainly localized within the proliferative foci and hepatocellular carcinoma (HCC) tissues. There was a better consistency between the development of hepatic lesions and cellular proliferative activity. Conclusion The morphologic evolution is closely related to proliferative activity during hepatocarcinogenesis in rats.

  2. Local Administration of Bisphosphonate-soaked Hydroxyapatite for the Treatment of Osteonecrosis of the Femoral Head in Rabbit

    Institute of Scientific and Technical Information of China (English)

    Jin-Hui Ma; Wan-Shou Guo; Zi-Rong Li; Bai-Liang Wang

    2016-01-01

    Background:Systemic administration ofbisphosphonates has shown promising results in the treatment ofosteonecrosis of the femoral head (ONFH).However,few studies have evaluated the efficacy of local zoledronate (ZOL) administration in the treatment of ONFH.The purpose of this study was to investigate whether local administration of bisphosphonate-soaked hydroxyapatite (HA) could improve bone healing in an experimental rabbit model of ONFH.Methods:This experimental study was conducted between October 2014 and June 2015.Forty-five rabbits underwent simulated ONFH surgery.Immediately following surgery,they were divided into three groups:model (untreated,n =15),HA (treated with HA alone,n =15),and HA + ZOL (treated with HA soaked in a low-dose ZOL solution,n =15).Histological,immunohistochemical,and quantitative analyses were performed to evaluate bone formation and resorption 2,4,and 8 weeks after surgery.Results:Gross bone matrix and hematopoietic tissue formation were observed in the HA + ZOL group 4 weeks after surgery.The immunohistochemical staining intensities for 5-bromodeoxyuridine,runt-related transcription factor 2,osteocalcin,osteopontin,and osteoprotegerin were significantly higher in the HA + ZOL group than that in the model (P < 0.001,P < 0.001,P < 0.001,P < 0.001,and P =0.018,respectively) and HA groups (P =0.003,P =0.049,P < 0.00l,P =0.020,and P =0.019,respectively),whereas receptor activator of the nuclear factor-κB ligand staining intensity was significantly lower in the HA + ZOL group than that in the model and HA groups (P =0.029 and P =0.015,respectively) 4 weeks after surgery.No significant differences in bone formation or bone resorption marker expression were found between the three groups 2 or 8 weeks after surgery (P > 0.05).Conclusions:Local administration of HA soaked in a low-dose ZOL solution increased new bone formation while inhibiting bone resorption in an animal model of ONFH,which might provide new evidence for joint

  3. Additional endpoints and overview of a mouse skeletal variant assay for detecting exposure to teratogens.

    Science.gov (United States)

    Beck, S L

    1993-02-01

    CD-1 mice were exposed in utero to one of 14 treatment regimes, several of them being replicated, with close agreement between series. Prenatal exposure to a teratogenic dose at a sensitive time enabled detection of 10 of 14 teratogen regimes by alterations in frequency or severity of a substantial number of the 88 variants in the Skeletal Variant Assay System (SVAS) screen when examined at 60-65 days post natal (DPN). These included 2,4,5-T (245T), Trifluralin (TFL), Maneb (MNB), Decamethrin (DMT), Acetazolamide (ACZM) either at 8 days post-coitus (DPC) or days 9-11 PC, trypan blue (TB), or 5' Bromodeoxyuridine (BUDR) on either 7 DPC, 8 DPC, or 9 DPC. Most of these observations have been reported elsewhere. All of the treatment regimes mentioned above, and another group of treatments, could be detected in the exposed CD-1 cohorts when additional endpoints were employed. One such endpoint was "frequently responding variants." These were: Interfrontals (IF), Parted Frontals (PF), Preoptic Sutures (PS), Foramina Transversaria Imperfecta of the first cervical (C) vertebra (FTI C1), FTI of the axis (C2), Accessory (Acc) Transverse Foramina (TF) of C3-C6, malformations of C3-C7, Fourteen (14) Ribs, Carpal Fusions (Fus), Lumbar Fus, 27-Presacral Vertebrae (PSV), and Sacral Fus. This endpoint revealed significant differences in the initial group of 10, plus Captan (CAPT) and Phenytoin (DPH). Yet another useful endpoint reported here was the existence of high magnitude effects (i.e., dramatic alterations in frequency of occurrence of a variant). These included IF in TB and ACZM; PF in ACZM; PS in BUDR; FTI-C1 in TB and 245T; FTI-C2 in 245T; 14 Ribs in ACZM, BUDR, and TFL; Carpal Fus in TB; 27-PSV in ACZM; Fewer than (<) 30 Caudal Vertebrae (Vert) in 245T, TFL; Caudal Fus in TB, ACZM-D9. Eight treatment regimes in all could be detected by the existence of 3 or more high magnitude effects (245T, MNB, TB, ACZM8, ACZM9-11, phenytoin, and possibly BUDR on days 7 or 8, each seen

  4. Differentiation of endogenous neural precursors following spinal cord injury in adult rats

    Institute of Scientific and Technical Information of China (English)

    Bin Zhao; Hua Han; Shuanke Wang; Bingren Gao; Zhengyi Sun

    2008-01-01

    BACKGROUND:Studies have shown that cell death can activate proliferation of endogenous neural stem cells and promote newly generated cells to migrate to a lesion site.OBJECTIVE:To observe regeneration and differentiation of neural cells following spinal cord injury in adult rats and to quantitatively analyze the newly differentiated cells.DESIGN,TIME AND SETTING:A cell biology experiment was performed at the Institute of Orthopedics and Medical Experimental Center,Lanzhou University.between August 2005 and October 2007.MATERIALS:Fifty adult,Wistar rats of both sexes;5-bromodeoxyuridine(BrdU,Sigma,USA);antibodies against neuron-specific enolase,glial fibrillary acidic protein,and myelin basic protein(Chemicon,USA).METHODS:Twenty-five rats were assigned to the spinal cord injury group and received a spinal cord contusion injury.Materials were obtained at day 1,3,7,15,and 29 after injury,with 5 rats for each time point.Twenty-five rats were sham-treated by removing the lamina of the vertebral arch without performing a contusion.MAIN OUTCOME MEASURES:The phenotype of BrdU-labeled cells,i.e.,expression and distribution of surface markers for neurons(neuron-specific enolase),astrocytes(glial fibrillary acidic protein),and oligodendrocytes(myelin basic protein),were identified with immunofluorescence double-labeling.Confocal microscopy was used to detect double-labeled cells by immunofluorescence.Quantitative analysis of newly generated cells was performed with stereological counting methods.RESULTS:There was significant cell production and differentiation after adult rat spinal cord injury.The quantity of newly-generated BrdU-labeled cells in the spinal cord lesion was 75-fold greater than in the corresponding area of control animals.Endogenous neural precursor cells differentiated into astrocytes and oligodendrocytes,however spontaneous neuronal difierentiation was not detected.Between 7 and 29 d after spinal cord injury,newly generated cells expressed increasingly more

  5. The olfactory bulb in newborn piglet is a reservoir of neural stem and progenitor cells.

    Science.gov (United States)

    Martin, Lee J; Katzenelson, Alyssa; Koehler, Raymond C; Chang, Qing

    2013-01-01

    The olfactory bulb (OB) periventricular zone is an extension of the forebrain subventricular zone (SVZ) and thus is a source of neuroprogenitor cells and neural stem cells. While considerable information is available on the SVZ-OB neural stem cell (NSC)/neuroprogenitor cell (NPC) niche in rodents, less work has been done on this system in large animals. The newborn piglet is used as a preclinical translational model of neonatal hypoxic-ischemic brain damage, but information about the endogenous sources of NSCs/NPCs in piglet is needed to implement endogenous or autologous cell-based therapies in this model. We characterized NSC/NPC niches in piglet forebrain and OB-SVZ using western blotting, histological, and cell culture methods. Immunoblotting revealed nestin, a NSC/NPC marker, in forebrain-SVZ and OB-SVZ in newborn piglet. Several progenitor or newborn neuron markers, including Dlx2, musashi, doublecortin, and polysialated neural cell adhesion molecule were also detected in OB-SVZ by immunoblotting. Immunohistochemistry confirmed the presence of nestin, musashi, and doublecortin in forebrain-SVZ and OB-SVZ. Bromodeoxyuridine (BrdU) labeling showed that the forebrain-SVZ and OB-SVZ accumulate newly replicated cells. BrdU-positive cells were immunolabeled for astroglial, oligodendroglial, and neuronal markers. A lateral migratory pathway for newly born neuron migration to primary olfactory cortex was revealed by BrdU labeling and co-labeling for doublecortin and class III β tubulin. Isolated and cultured forebrain-SVZ and OB-SVZ cells from newborn piglet had the capacity to generate numerous neurospheres. Single cell clonal analysis of neurospheres revealed the capacity for self-renewal and multipotency. Neurosphere-derived cells differentiated into neurons, astrocytes, and oligodendrocytes and were amenable to permanent genetic tagging with lentivirus encoding green fluorescent protein. We conclude that the piglet OB-SVZ is a reservoir of NSCs and NPCs suitable

  6. Differentiation of Murine Bone Marrow-Derived Smooth Muscle Progenitor Cells Is Regulated by PDGF-BB and Collagen.

    Directory of Open Access Journals (Sweden)

    Clifford Lin

    Full Text Available Smooth muscle cells (SMCs are key regulators of vascular disease and circulating smooth muscle progenitor cells may play important roles in vascular repair or remodelling. We developed enhanced protocols to derive smooth muscle progenitors from murine bone marrow and tested whether factors that are increased in atherosclerotic plaques, namely platelet-derived growth factor-BB (PDGF-BB and monomeric collagen, can influence the smooth muscle specific differentiation, proliferation, and survival of mouse bone marrow-derived progenitor cells. During a 21 day period of culture, bone marrow cells underwent a marked increase in expression of the SMC markers α-SMA (1.93 ± 0.15 vs. 0.0008 ± 0.0003 (ng/ng GAPDH at 0 d, SM22-α (1.50 ± 0.27 vs. 0.005 ± 0.001 (ng/ng GAPDH at 0 d and SM-MHC (0.017 ± 0.004 vs. 0.001 ± 0.001 (ng/ng GAPDH at 0 d. Bromodeoxyuridine (BrdU incorporation experiments showed that in early culture, the smooth muscle progenitor subpopulation could be identified by high proliferative rates prior to the expression of smooth muscle specific markers. Culture of fresh bone marrow or smooth muscle progenitor cells with PDGF-BB suppressed the expression of α-SMA and SM22-α, in a rapidly reversible manner requiring PDGF receptor kinase activity. Progenitors cultured on polymerized collagen gels demonstrated expression of SMC markers, rates of proliferation and apoptosis similar to that of cells on tissue culture plastic; in contrast, cells grown on monomeric collagen gels displayed lower SMC marker expression, lower growth rates (319 ± 36 vs. 635 ± 97 cells/mm2, and increased apoptosis (5.3 ± 1.6% vs. 1.0 ± 0.5% (Annexin 5 staining. Our data shows that the differentiation and survival of smooth muscle progenitors are critically affected by PDGF-BB and as well as the substrate collagen structure.

  7. Hypoxia-Inducible Factor Pathway Inhibition Resolves Tumor Hypoxia and Improves Local Tumor Control After Single-Dose Irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Helbig, Linda [OncoRay–National Center for Radiation Research in Oncology, Medical Faculty Carl Gustav Carus, Technische Universität Dresden, Dresden (Germany); Department of Radiation Oncology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden (Germany); Koi, Lydia [OncoRay–National Center for Radiation Research in Oncology, Medical Faculty Carl Gustav Carus, Technische Universität Dresden, Dresden (Germany); Department of Radiation Oncology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden (Germany); Deutsches Konsortium für Translationale Krebsforschung, Site Dresden, Dresden (Germany); Brüchner, Kerstin [Department of Radiation Oncology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden (Germany); Institute of Radiooncology Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Gurtner, Kristin [Department of Radiation Oncology, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden (Germany); Hess-Stumpp, Holger; Unterschemmann, Kerstin [Global Drug Discovery, Bayer Pharma, Berlin (Germany); Pruschy, Martin [Radiation Oncology, University of Zurich, Zurich (Switzerland); and others

    2014-01-01

    Purpose: To study the effects of BAY-84-7296, a novel orally bioavailable inhibitor of mitochondrial complex I and hypoxia-inducible factor 1 (HIF-1) activity, on hypoxia, microenvironment, and radiation response of tumors. Methods and Materials: UT-SCC-5 and UT-SCC-14 human squamous cell carcinomas were transplanted subcutaneously in nude mice. When tumors reached 4 mm in diameter BAY-84-7296 (Bayer Pharma AG) or carrier was daily administered to the animals. At 7 mm tumors were either excised for Western blot and immunohistologic investigations or were irradiated with single doses. After irradiation animals were randomized to receive BAY-84-7296 maintenance or carrier. Local tumor control was evaluated 150 days after irradiation, and the dose to control 50% of tumors (TCD{sub 50}) was calculated. Results: BAY-84-7296 decreased nuclear HIF-1α expression. Daily administration of inhibitor for approximately 2 weeks resulted in a marked decrease of pimonidazole hypoxic fraction in UT-SCC-5 (0.5% vs 21%, P<.0001) and in UT-SCC-14 (0.3% vs 19%, P<.0001). This decrease was accompanied by a significant increase in fraction of perfused vessels in UT-SCC-14 but not in UT-SCC-5. Bromodeoxyuridine and Ki67 labeling indices were significantly reduced only in UT-SCC-5. No significant changes were observed in vascular area or necrosis. BAY-84-7296 before single-dose irradiation significantly decreased TCD{sub 50}, with an enhancement ratio of 1.37 (95% confidence interval [CI] 1.13-1.72) in UT-SCC-5 and of 1.55 (95% CI 1.26-1.94) in UT-SCC-14. BAY-84-7296 maintenance after irradiation did not further decrease TCD{sub 50}. Conclusions: BAY-84-7296 resulted in a marked decrease in tumor hypoxia and substantially reduced radioresistance of tumor cells with the capacity to cause a local recurrence after irradiation. The data suggest that reduction of cellular hypoxia tolerance by BAY-84-7296 may represent the primary biological mechanism underlying the observed enhancement of

  8. Chromogranin A and its fragments as regulators of small intestinal neuroendocrine neoplasm proliferation.

    Directory of Open Access Journals (Sweden)

    Francesco Giovinazzo

    Full Text Available INTRODUCTION: Chromogranin A is a neuroendocrine secretory product and its loss is a feature of malignant NEN de-differentiation. We hypothesized that chromogranin A fragments were differentially expressed during NEN metastasis and played a role in the regulation of NEN proliferation. METHODS: Chromogranin A mRNA (PCR and protein (ELISA/western blot were studied in 10 normal human mucosa, 5 enterochromaffin cell preparations, 26 small intestinal NEN primaries and 9 liver metastases. Cell viability (WST-1 assay, proliferation (bromodeoxyuridine ELISA and expression of AKT/AKT-P (CASE ELISA/western blot in response to chromogranin A silencing, inhibition of prohormone convertase and mTOR inhibition (RAD001/AKT antisense as well as different chromogranin A fragments were examined in 4 SI-NEN cell lines. RESULTS: Chromogranin A mRNA and protein levels were increased (37-340 fold, p<0.0001 in small intestinal NENs compared to normal enterochromaffin cells. Western blot identified chromogranin A-associated processing bands including vasostatin in small intestinal NENs as well as up-regulated expression of prohormone convertase in metastases. Proliferation in small intestinal NEN cell lines was decreased by silencing chromogranin A as well as by inhibition of prohormone convertase (p<0.05. This inhibition also decreased secretion of chromogranin A (p<0.05 and 5-HT (p<0.05 as well as expression of vasostatin. Metastatic small intestinal NEN cell lines were stimulated (50-80%, p<0.05 and AKT phosphorylated (Ser473: p<0.05 by vasostatin I, which was completely reversed by RAD001 (p<0.01 and AKT antisense (p<0.05 while chromostatin inhibited proliferation (~50%, p<0.05. CONCLUSION: Chromogranin A was differentially regulated in primary and metastatic small intestinal NENs and cell lines. Chromogranin A fragments regulated metastatic small intestinal NEN proliferation via the AKT pathway indicating that CgA plays a far more complex role in the biology of

  9. Resveratrol, but not EGCG, in the diet suppresses DMBA-induced mammary cancer in rats

    Directory of Open Access Journals (Sweden)

    Whitsett Timothy

    2006-05-01

    Full Text Available Abstract Despite the advent of new and aggressive therapeutics, breast cancer remains a leading killer among women; hence there is a need for the prevention of this disease. Several naturally occurring polyphenols have received much attention for their health benefits, including anti-carcinogenic properties. Two of these are resveratrol, a component of red grapes, and epigallocatechin-3-gallate (EGCG, the major catechin found in green tea. In this study, we tested the hypothesis that these two polyphenols protect against chemically-induced mammary cancer by modulating mammary gland architecture, cell proliferation, and apoptosis. Female Sprague-Dawley CD rats were exposed to either resveratrol (1 g/kg AIN-76A diet, EGCG (0.065% in the drinking water, or control diet (AIN-76A for the entirety of their life starting at birth. At 50 days postpartum, rats were treated with 60 mg dimethylbenz[a]anthracene (DMBA/kg body weight to induce mammary cancer. Resveratrol, but not EGCG, suppressed mammary carcinogenesis (fewer tumors per rat and longer tumor latency. Analysis of mammary whole mounts from 50-day-old rats revealed that resveratrol, but not EGCG, treatment resulted in more differentiated lobular structures. Bromodeoxyuridine (BrdU incorporation studies showed that resveratrol treatment caused a significant reduction in proliferative cells in mammary terminal ductal structures at 50 days postpartum, making them less susceptible to carcinogen insult. The epithelial cells of terminal end buds in the mammary glands of resveratrol-treated rats also showed an increase in apoptotic cells compared to the control or EGCG-treated rats as measured by a DNA fragmentation assay. At the given doses, resveratrol treatment resulted in a serum resveratrol concentration of 2.00 μM, while treatment with EGCG resulted in a serum EGCG concentration of 31.06 nM. 17β-Estradiol, progesterone, and prolactin concentrations in the serum were not significantly affected

  10. Epithelial cell senescence impairs repair process and exacerbates inflammation after airway injury

    Directory of Open Access Journals (Sweden)

    Nagai Atsushi

    2011-06-01

    Full Text Available Abstract Background Genotoxic stress, such as by exposure to bromodeoxyuridine (BrdU and cigarette smoke, induces premature cell senescence. Recent evidence indicates that cellular senescence of various types of cells is accelerated in COPD patients. However, whether the senescence of airway epithelial cells contributes to the development of airway diseases is unknown. The present study was designed to test the hypothesis that premature senescence of airway epithelial cells (Clara cells impairs repair processes and exacerbates inflammation after airway injury. Methods C57/BL6J mice were injected with the Clara-cell-specific toxicant naphthalene (NA on days 0, 7, and 14, and each NA injection was followed by a daily dose of BrdU on each of the following 3 days, during which regenerating cells were allowed to incorporate BrdU into their DNA and to senesce. The p38 MAPK inhibitor SB202190 was injected 30 minutes before each BrdU dose. Mice were sacrificed at different times until day 28 and lungs of mice were obtained to investigate whether Clara cell senescence impairs airway epithelial regeneration and exacerbates airway inflammation. NCI-H441 cells were induced to senesce by exposure to BrdU or the telomerase inhibitor MST-312. Human lung tissue samples were obtained from COPD patients, asymptomatic smokers, and nonsmokers to investigate whether Clara cell senescence is accelerated in the airways of COPD patients, and if so, whether it is accompanied by p38 MAPK activation. Results BrdU did not alter the intensity of the airway epithelial injury or inflammation after a single NA exposure. However, after repeated NA exposure, BrdU induced epithelial cell (Clara cell senescence, as demonstrated by a DNA damage response, p21 overexpression, increased senescence-associated β-galactosidase activity, and growth arrest, which resulted in impaired epithelial regeneration. The epithelial senescence was accompanied by p38 MAPK-dependent airway

  11. Effect of antisense RNA targeting polo-like kinase 1 on cell cycle and proliferation in A549 cells

    Institute of Scientific and Technical Information of China (English)

    周琼; 白明; 苏远

    2004-01-01

    Background Expression of polo-like kinase 1 (Plk1) is elevated in lung cancer and has been proposed as having prognostic value and related to resistance to chemotherapy and radiation. In addition, Plk1 has several functions in mitotic progression. In this study, the authors investigated the effect of Plk1 depletion on cell cycle progression and proliferation in A549 cells, a lung cancer cell line.Methods A recombinant plasmid containing antisense RNA targeting Plk1 (pcDNA3-Plk1) was transfected into A549 cells. Reverse transcription-polymerase chain reaction and Western blot were used to examine Plk1 gene expression. Cell proliferation was evaluated by direct cell counting and bromodeoxyuridine (BrdU) labelling. Cell cycle and apoptosis were examined by flow cytometry. Expression of α-tubulin was detected by immunofluorescence, and the inhibition rate (IR) by chemotherapeutic agents was determined by 3-(4,5-dimethylthiazol-2-yl) 2,5-diphenyl-tetrazolium bromide assay.Results After transfection into A549 cells, pcDNA3-Plk1 reduced Plk1 mRNA by 46.75% for 24 hours and by 61.84% for 48 hours. Plk1 protein was significantly decreased simultaneously (P<0.05). Abnormal morphological changes of cells and growth inhibition were observed in pcDNA3-Plk1 transfected groups. The BrdU labelling index was 25.59% 48 hours after transfection, which was significantly lower than that of the control groups (P<0.05). Forty-eight hours after transfection, there showed absence of microtubule polymerization and spindle abnormalities in staining for α-tubulin. A549 cells showed a strong G2/M arrest and apoptosis 72 hours post transfection. IR of vinorelbine in pcDNA3-Plk1 transfected groups was significantly higher than that of the other groups (P<0.05, respectively).Conclusions Plk1 depletion interferes with spindle formation, induces cell cycle arrest and apoptosis, and consequently inhibits cell proliferation in A549 cells. Moreover, it sensitizes lung cancer cells to chemotherapy.

  12. Improved function and proliferation of adult human beta cells engrafted in diabetic immunodeficient NOD-scid IL2rγnull mice treated with alogliptin

    Directory of Open Access Journals (Sweden)

    Jurczyk A

    2013-12-01

    Full Text Available Agata Jurczyk,1 Philip diIorio,1 Dean Brostowin,1 Linda Leehy,1 Chaoxing Yang,1 Fumihiko Urano,2 David M Harlan,3 Leonard D Shultz,4 Dale L Greiner,1 Rita Bortell1 1Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA, 2Department of Medicine, Washington University School of Medicine, St Louis, MO, 3Department of Medicine, University of Massachusetts Medical School, Worcester, MA, 4The Jackson Laboratory, Bar Harbor, ME, USA Purpose: Dipeptidyl-peptidase-4 (DPP-4 inhibitors are known to increase insulin secretion and beta cell proliferation in rodents. To investigate the effects on human beta cells in vivo, we utilize immunodeficient mice transplanted with human islets. The study goal was to determine the efficacy of alogliptin, a DPP-4 inhibitor, to enhance human beta cell function and proliferation in an in vivo context using diabetic immunodeficient mice engrafted with human pancreatic islets. Methods: Streptozotocin-induced diabetic NOD-scid IL2rγnull (NSG mice were transplanted with adult human islets in three separate trials. Transplanted mice were treated daily by gavage with alogliptin (30 mg/kg/day or vehicle control. Islet graft function was compared using glucose tolerance tests and non-fasting plasma levels of human insulin and C-peptide; beta cell proliferation was determined by bromodeoxyuridine (BrdU incorporation. Results: Glucose tolerance tests were significantly improved by alogliptin treatment for mice transplanted with islets from two of the three human islet donors. Islet-engrafted mice treated with alogliptin also had significantly higher plasma levels of human insulin and C-peptide compared to vehicle controls. The percentage of insulin+BrdU+ cells in human islet grafts from alogliptin-treated mice was approximately 10-fold more than from vehicle control mice, consistent with a significant increase in human beta cell proliferation. Conclusion: Human islet-engrafted immunodeficient mice

  13. Characterization of hepatocellular resistance and susceptibility to styrene toxicity in B6C3F1 mice.

    Science.gov (United States)

    Mahler, J F; Price, H C; O'Connor, R W; Wilson, R F; Eldridge, S R; Moorman, M P; Morgan, D L

    1999-03-01

    Short-term inhalation exposure of B6C3F1 mice to styrene causes necrosis of centrilobular (CL) hepatocytes. However, in spite of continued exposure, the necrotic parenchyma is rapidly regenerated, indicating resistance by regenerated cells to styrene toxicity. These studies were conducted to test the hypothesis that resistance to repeated styrene exposure is due to sustained cell proliferation, with production of hepatocytes that have reduced metabolic capacity. Male mice were exposed to air or 500 ppm styrene (6 h/day); hepatotoxicity was evaluated by microscopic examination, serum liver enzyme levels, and bromodeoxyuridine (BrdU)-labeling index (LI). Metabolism was assessed by measurement of blood styrene and styrene oxide. Both single and repeated exposures to styrene resulted in mortality by Day 2; in mice that survived, there was CL necrosis with elevated BrdU LI at Day 6, and complete restoration of the necrotic parenchyma by Day 15. The BrdU LI in mice given a single exposure had returned to control levels by Day 15. Re-exposure of these mice on Day 15 resulted in additional mortality and hepatocellular necrosis, indicating that regenerated CL cells were again susceptible to the cytolethal effect of styrene following a 14-day recovery. However, in mice repeatedly exposed to styrene for 14 days, the BrdU LI remained significantly increased on Day 15, with preferential labeling of CL hepatocytes with enlarged nuclei (karyomegaly). If repeated exposures were followed by a 10-day recovery period, CL karyomegaly persisted, but the BrdU LI returned to control level and CL hepatocytes became susceptible again to styrene toxicity as demonstrated by additional mortality and acute necrosis after a challenge exposure. These findings indicated a requirement for continued styrene exposure and DNA synthesis in order to maintain this resistant phenotype. Analyses of proliferating-cell nuclear-antigen (PCNA) labeling were conducted to further characterize the cell cycle

  14. SOX2 and SOX2-MYC Reprogramming Process of Fibroblasts to the Neural Stem Cells Compromised by Senescence.

    Directory of Open Access Journals (Sweden)

    Marta Winiecka-Klimek

    Full Text Available Tumorigenic potential of induced pluripotent stem cells (iPSCs infiltrating population of induced neural stem cells (iNSCs generated from iPSCs may limit their medical applications. To overcome such a difficulty, direct reprogramming of adult somatic cells into iNSCs was proposed. The aim of this study was the systematic comparison of induced neural cells (iNc obtained with different methods-direct reprogramming of human adult fibroblasts with either SOX2 (SiNSc-like or SOX2 and c-MYC (SMiNSc-like and induced pluripotent stem cells differentiation to ebiNSc-in terms of gene expression profile, differentiation potential as well as proliferation properties. Immunocytochemistry and real-time PCR analyses were used to evaluate gene expression profile and differentiation potential of various iNc types. Bromodeoxyuridine (BrdU incorporation and senescence-associated beta-galactosidase (SA-β-gal assays were used to estimate proliferation potential. All three types of iNc were capable of neuronal differentiation; however, astrocytic differentiation was possible only in case of ebiNSc. Contrary to ebiNSc generation, the direct reprogramming was rarely a propitious process, despite 100% transduction efficiency. The potency of direct iNSCs-like cells generation was lower as compared to iNSCs obtained by iPSCs differentiation, and only slightly improved when c-MYC was added. Directly reprogrammed iNSCs-like cells were lacking the ability to differentiate into astrocytic cells and characterized by poor efficiency of neuronal cells formation. Such features indicated that these cells could not be fully reprogrammed, as confirmed mainly with senescence detection. Importantly, SiNSc-like and SMiNSc-like cells were unable to achieve the long-term survival and became senescent, which limits their possible therapeutic applicability. Our results suggest that iNSCs-like cells, generated in the direct reprogramming attempts, were either not fully reprogrammed or

  15. Migration and differentiation of bone marrow-derived multipotent adult progenitor cells through tail vein injection in a rat model of cerebral ischemia

    Institute of Scientific and Technical Information of China (English)

    Lei Lei; Ruixiang Zhou

    2009-01-01

    BACKGROUND: Multipotent adult progenitor cells (MAPCs) from the bone marrow have been shown to differentiate into neurons.OBJECTIVE: To observe migration, survival, and neuronal-like differentiation of MAPCs by tail vein injection.DESIGN, TIME AND SETTING: Randomized, controlled experiment of neural tissue engineering was performed at the Laboratory for Cardio-Cerebrovascular Disease, Hospital of Integrated Traditional and Western Medicine, Tongji Medical College of Huazhong University of Science and Technology between September 2006 and August 2007.MATERIALS: Eighty Sprague Dawley rats, 3-6 months old, underwent cerebral ischemia/reperfusion by thread technique, and were randomly divided into model and MAPCs groups (n = 40).METHODS: Mononuclear cells were harvested from bone marrow using the Ficoll-Paque density gradient centrifugation method. After removing CD45 and glycophorin A-positive cells (GLYA+) with immunomagnetic beads, CD45 GLYA adult progenitor cells were labeled with bromodeoxyuridine (5-bromo-2-deoxyuridine, BrdU). A total of 1 mL cell suspension, containing 5 ×106 MAPCs, was injected into the MAPCs group through the tail vein. A total of 1 mL normal saline was injected into the model rats.MAIN OUTCOME MEASURES: After 60 days, BrdU and neuron-specific enolase double-positive cells were observed using immunofluorescence. Cell morphology was observed under electron microscopy, and nerve growth factor mRNA was measured through RT-PCR. In addition, rat neurological functions were measured with behavioral tests.RESULTS: Immunofluorescence revealed that MAPCs positive for BrdU and neuron specific enolase were found surrounding the ischemic focus in the MAPCs group. Microscopic observation suggested that MAPCs-derived neuronal-like cells connected with other nerve cells to form synapses, Compared with the model animals, the level of nerve growth factor mRNA was significantly upregulated in rats injected with MAPCs (P < 0.05). In addition, rats in the MAPCs

  16. Age-dependent neuroplasticity mechanisms in Alzheimer Tg2576 mice following modulation of brain amyloid-β levels.

    Directory of Open Access Journals (Sweden)

    Anna M Lilja

    Full Text Available The objective of this study was to investigate the effects of modulating brain amyloid-β (Aβ levels at different stages of amyloid pathology on synaptic function, inflammatory cell changes and hippocampal neurogenesis, i.e. processes perturbed in Alzheimer's disease (AD. Young (4- to 6-month-old and older (15- to 18-month-old APP(SWE transgenic (Tg2576 mice were treated with the AD candidate drug (+-phenserine for 16 consecutive days. We found significant reductions in insoluble Aβ1-42 levels in the cortices of both young and older transgenic mice, while significant reductions in soluble Aβ1-42 levels and insoluble Aβ1-40 levels were only found in animals aged 15-18 months. Autoradiography binding with the amyloid ligand Pittsburgh Compound B ((3H-PIB revealed a trend for reduced fibrillar Aβ deposition in the brains of older phenserine-treated Tg2576 mice. Phenserine treatment increased cortical synaptophysin levels in younger mice, while decreased interleukin-1β and increased monocyte chemoattractant protein-1 and tumor necrosis factor-alpha levels were detected in the cortices of older mice. The reduction in Aβ1-42 levels was associated with an increased number of bromodeoxyuridine-positive proliferating cells in the hippocampi of both young and older Tg2576 mice. To determine whether the increased cell proliferation was accompanied by increased neuronal production, the endogenous early neuronal marker doublecortin (DCX was examined in the dentate gyrus (DG using immunohistochemical detection. Although no changes in the total number of DCX(+-expressing neurons were detected in the DG in Tg2576 mice at either age following (+-phenserine treatment, dendritic arborization was increased in differentiating neurons in young Tg2576 mice. Collectively, these findings indicate that reducing Aβ1-42 levels in Tg2576 mice at an early pathological stage affects synaptic function by modulating the maturation and plasticity of newborn neurons in

  17. Perinatal undernutrition modifies cell proliferation and brain-derived neurotrophic factor levels during critical time-windows for hypothalamic and hippocampal development in the male rat.

    Science.gov (United States)

    Coupé, B; Dutriez-Casteloot, I; Breton, C; Lefèvre, F; Mairesse, J; Dickes-Coopman, A; Silhol, M; Tapia-Arancibia, L; Lesage, J; Vieau, D

    2009-01-01

    Maternal perinatal undernutrition (MPU) modifies the activity of the hypothalamic-pituitary-adrenal axis and sensitises to the development of metabolic and cognitive adult diseases. Because the hypothalamus and hippocampus are involved in the regulation of neuroendocrine activity, energy metabolism and cognition, we hypothesised that a maternal 50% food restriction (FR50) from day 14 of pregnancy (E14) until postnatal day 21 (P21) would affect the development of these structures in male rat offspring. Protein and mRNA levels of brain-derived neurotrophic factor (BDNF) and cell proliferation [analysed by 5-bromodeoxyuridine (BrdU) incorporation] were compared in both control and FR50 rats from E21 to P22. Although the pattern of the evolution of BDNF concentration and cell proliferation throughout development was not strikingly different between groups, several disturbances at specific developmental stages were observed. FR50 rats exhibited a delayed increase of hippocampal BDNF content whereas, in the hypothalamus, BDNF level was augmented from E21 to P14 and associated, at this latter stage, with an increased mRNA expression of TRkB-T2. In both groups, a correlation between BDNF content and the number of BrdU positive cells was noted in the dentate gyrus, whereas opposite variations were observed in CA1, CA2 and CA3 layers, and in the arcuate and ventromedial nuclei. In the hippocampus, P15-FR50 rats showed an increased number of BrdU positive cells in all regions, whereas, at P22, a decrease was observed in the CA2. In the hypothalamus, between E21 and P8, MPU increases the number of BrdU positive cells in all regions analysed and, until P15, marked differences were noticed in the median eminence, the paraventricular nucleus and the arcuate nucleus. Taken together, the results obtained in the present study show that MPU changes the time course of production of BDNF and cell proliferation in specific hippocampal and hypothalamic areas during sensitive

  18. Cytotoxicity of dental composite (co)monomers and the amalgam component Hg(2+) in human gingival fibroblasts.

    Science.gov (United States)

    Reichl, Franz-Xaver; Simon, Sabine; Esters, Magalie; Seiss, Mario; Kehe, Kai; Kleinsasser, Norbert; Hickel, Reinhard

    2006-08-01

    Unpolymerized resin (co)monomers or mercury (Hg) can be released from restorative dental materials (e.g. composites and amalgam). They can diffuse into the tooth pulp or the gingiva. They can also reach the gingiva and organs by the circulating blood after the uptake from swallowed saliva. The cytotoxicity of dental composite components hydroxyethylmethacrylate (HEMA), triethyleneglycoldimethacrylate (TEGDMA), urethanedimethacrylate (UDMA), and bisglycidylmethacrylate (Bis-GMA) as well as the amalgam component Hg(2+) (as HgCl(2)) and methyl mercury chloride (MeHgCl) was investigated on human gingival fibroblasts (HGFs) at two time intervals. To test the cytotoxicity of substances, the bromodeoxyuridine (BrdU) assay and the lactate dehydrogenase (LDH) assay were used. The test substances were added in various concentrations and cells were incubated for 24 or 48 h. The EC(50) values were obtained as half-maximum-effect concentrations from fitted curves. Following EC(50) values were found [BrdU: mean (mmol/l); SEM in parentheses; n=12]: (24 h/48 h) HEMA 8.860 (0.440)/6.600(0.630), TEGDMA 1.810(0.130)/1.220(0.130), UDMA 0.120(0.010)/0.140(0.010), BisGMA 0.060(0.004)/0.040(0.002), HgCl(2) 0.015(0.001)/0.050(0.006), and MeHgCl 0.004(0.001)/0.005(0.001). Following EC(50) values were found [LDH: mean (mmol/l); SEM in parentheses; n=12]: (24 h/48 h) HEMA 9.490(0.300)/7.890(1.230), TEGDMA 2.300(0.470)/1.950(0.310), UDMA 0.200(0.007)/0.100(0.007), BisGMA 0.070(0.005)/0.100(0.002), and MeHgCl 0.014(0.006)/0.010(0.003). In both assays, the following range of increased toxicity was found for composite components (24 and 48 h): HEMA < TEGDMA < UDMA < BisGMA. In both assays, MeHgCl was the most toxic substance. In the BrdU assay, Hg(2+) was about fourfold less toxic than MeHgCl but Hg(2+) was about fourfold more toxic than BisGMA. In the BrdU test, a significantly (P<0.05) decreased toxicity was observed for Hg(2+) at 48 h, compared to the 24 h Hg(2+)-exposure. A time depending

  19. The experimental study of nonunion treatment with Extracorporeal Shock Wave Therapy and Autograft of 5-BrdU labled Bone Mesenchymal Stem Cells of Rabbits%体外冲击波结合自体5-BrdU标记骨髓间充质干细胞移植治疗骨不连的实验研究

    Institute of Scientific and Technical Information of China (English)

    王旭明; 邢更彦; 韩新明

    2010-01-01

    目的 在体外成功分离培养标记兔骨髓间充质干细胞(Bone mesenchymal stem cells,BMSCs)的基础上,观察体外冲击波疗法(Extracorporeal shock wave therapy,ESWT)结合自体BMSCs移植治疗骨不连的疗效.方法 制作兔骨不连模型并根据于预方式不同随机分为4个组:冲击波结合干细胞组,干细胞组,冲击波组,完全对照组.定期拍片测量骨折间隙宽度变化(2周、6周、10周)、免疫组化观察,10周后比较愈合率.结果 标记后的干细胞移植6周后,在冲击波结合干细胞组、干细胞组骨痂中可见(5-bromodeoxyuridine,BrdU)标记的阳性细胞聚集,冲击波组和对照组中未发现明显的聚集现象;冲击波结合干细胞组干预后6周、10周,与其它各组骨不连间隙差异有显著性;10周后冲击波结合干细胞组骨不连愈合效果好,与其他各组统计学上差异有意义.结论 移植的自体干细胞可能参与了骨不连的成骨,结合冲击波的微动力学刺激,有利于骨折的愈合,有望成为一种较好的骨不连治疗方法.

  20. p53-dependent gene profiling for reactive oxygen species after benzene inhalation: special reference to genes associated with cell cycle regulation.

    Science.gov (United States)

    Hirabayashi, Yoko

    2005-05-30

    Benzene toxicity has long been thought to be due to its metabolites including reactive oxygen species (ROS). However, the major toxicological effect of benzene in wild-type mice carrying normal alleles of the p53 gene appears to be the significant perturbation of cell cycle regulation, possibly via an indirect signaling pathway. Other prominent genotoxic cellular damage can occur in the absence of cell cycle arrest in p53 gene deficiency. The suppression of cell cycle is clearly detected using a tool for stem-cell-specific cell cycle observation by the BU-UV method. Cells (including hemopoietic progenitor cells) in S-phase are labeled in vivo with bromodeoxyuridine (BrdU) and then exposed to near-ultraviolet (UV) light to kill cells that incorporated BrdU. The target fraction, the S-phase, is then evaluated on the basis of decreased numbers of hemopoietic colonies formed in assays such as for granulomacrophage colony-forming units (CFU-GM). Benzene toxicity was found to be more prominent in the primitive stem-cell compartment, as first suggested more than 20 years ago. Interestingly, when one examines the stem-cell-specific steady-state gene expression profiling, several key genes associated with benzene exposure are specifically identified, including CYP2E1. Benzene toxicity was found to be mediated by aryl hydrocarbon receptor (AhR) at an expression level; thus, the effect of benzene can be detected in nature at lower levels in the stem-cell compartment than expected. Alterations in gene expression profiles compared with those in steady-state gene expression profiles in the stem-cell compartment may elucidate the mechanism underlying benzene toxicity. Functional gene expressions after benzene exposure are not always detected, because their phenotypic expressions are often masked by the balance of expression of genes participating in various pathways of homeostasis, for example, p53. Thus, the actual expressions of the above-mentioned cell cycle-related genes may

  1. Adult hippocampal neurogenesis is impaired by transient and moderate developmental thyroid hormone disruption.

    Science.gov (United States)

    Gilbert, M E; Goodman, J H; Gomez, J; Johnstone, A F M; Ramos, R L

    2016-12-31

    The hippocampus maintains a capacity for neurogenesis throughout life, a capacity that is reduced in models of adult onset hypothyroidism. The effects of developmental thyroid hormone (TH) insufficiency on neurogenesis in the adult hippocampus, however, has not been examined. Graded degrees of TH insufficiency were induced in pregnant rat dams by administration of 0, 3 or 10ppm of 6-propylthiouracil (PTU) in drinking water from gestational day (GD) 6 until weaning. Body, brain, and hippocampal weight were reduced on postnatal day (PN) 14, 21, 78 and hippocampal volume was smaller at the 10 but not 3ppm dose level. A second experiment examined adult hippocampal neurogenesis following developmental or adult onset hypothyroidism. Two male offspring from 0 and 3ppm exposed dams were either maintained on control water or exposed to 3ppm PTU to create 4 distinct treatment conditions (Control-Control; Control-PTU, PTU-Control, PTU-PTU) based on developmental and adult exposures. Beginning on the 28th day of adult exposure to 0 or 3ppm PTU, bromodeoxyuridine (BrdU, 50mg/kg, ip) was administered twice daily for 5days, and one male from each treatment was sacrificed 24h and 28days after the last BrdU dose and brains processed for immunohistochemistry. Although no volume changes were seen in the hippocampus of the neonate at 3ppm, thinning of the granule cell layer emerged in adulthood. Developmental TH insufficiency produced a reduction in newly born cells, reducing BrdU+ve cells at 1 with no further reduction at 28-days post-BrdU. Similar findings were obtained using the proliferative cell marker Ki67. Neuronal differentiations was also altered with fewer doublecortin (Dcx) expressing cells and a higher proportion of immature Dcx phenotypes seen after developmental but not adult TH insufficiency. An impaired capacity for neurogenesis may contribute to impairments in synaptic plasticity and cognitive deficits previously reported by our laboratory and others following

  2. MARCKS Signaling Differentially Regulates Vascular Smooth Muscle and Endothelial Cell Proliferation through a KIS-, p27kip1- Dependent Mechanism.

    Directory of Open Access Journals (Sweden)

    Dan Yu

    Full Text Available Overexpression of the myristolated alanine-rich C kinase substrate (MARCKS occurs in vascular proliferative diseases such as restenosis after bypass surgery. MARCKS knockdown results in arrest of vascular smooth muscle cell (VSMC proliferation with little effect on endothelial cell (EC proliferation. We sought to identify the mechanism of differential regulation by MARCKS of VSMC and EC proliferation in vitro and in vivo.siRNA-mediated MARCKS knockdown in VSMCs inhibited proliferation and prevented progression from phase G0/G1 to S. Protein expression of the cyclin-dependent kinase inhibitor p27kip1, but not p21cip1 was increased by MARCKS knockdown. MARCKS knockdown did not affect proliferation in VSMCs derived from p27kip1-/- mice indicating that the effect of MARCKS is p27kip1-dependent. MARCKS knockdown resulted in decreased phosphorylation of p27kip1 at threonine 187 and serine 10 as well as, kinase interacting with stathmin (KIS, cyclin D1, and Skp2 expression. Phosphorylation of p27kip1 at serine 10 by KIS is required for nuclear export and degradation of p27kip1. MARCKS knockdown caused nuclear trapping of p27kip1. Both p27kip1 nuclear trapping and cell cycle arrest were released by overexpression of KIS, but not catalytically inactive KIS. In ECs, MARCKS knockdown paradoxically increased KIS expression and cell proliferation. MARCKS knockdown in a murine aortic injury model resulted in decreased VSMC proliferation determined by bromodeoxyuridine (BrdU integration assay, and inhibition of vascular wall thickening. MARCKS knockdown increased the rate of re-endothelialization.MARCKS knockdown arrested VSMC cell cycle by decreasing KIS expression. Decreased KIS expression resulted in nuclear trapping of p27kip1 in VSMCs. MARCKS knockdown paradoxically increased KIS expression in ECs resulting in increased EC proliferation. MARCKS knockdown significantly attenuated the VSMC proliferative response to vascular injury, but accelerated

  3. Wnt3a signaling promotes proliferation,myogenic differentiation,and migration of rat bone marrow mesenchymal stem cells

    Institute of Scientific and Technical Information of China (English)

    Yan-chang SHANG; Shu-hui WANG; Fu XIONG; Cui-ping ZHAO; Fu-ning PENG; Shan-wei FENG; Mei-shan LI; Yong LI; Cheng ZHANG

    2007-01-01

    Aim:To investigate the effects of the wingless-related MMTV integration site 3A (Wnt3a) signaling on the proliferation,migration,and the myogenic and adipogenic differentiation of rat bone marrow mesenchymal stem cells (rMSC). Methods:Primary MSC were isolated and cultured from Spragne-Dawley rats and characterized by flow cytometry. Mouse L cells were transfected with Wnt3a cDNA,and conditioned media containing active Wnt3a proteins were prepared. Cell proliferation was evaluated by cell count and 5-bromodeoxyuridine incorporation assay.The migration of rMSC was performed by using a transwell migration and wound healing assay. The myogenic and adipogenic differentiation in rMSC were examined by light microscopy,immunofluorescence,and RT-PCR at different time points after myogenic or adipogenic introduction. Results:Wnt3a signaling induced β-catenin nuclear translocation and activated the Writ pathway in rMSC.In the presence of Wnt3a,rMSC proliferated more rapidly than the control cells,keeping their differentiation potential. Moreover,Wnt3a signaling induced 2.62%and 3.76% of rMSC-expressed desmin and myosin heavy chain after being cultured in myogenic medium. The myogenic differentiation genes,including Pax7,MyoD,Myf5,Myf4,and myogenin,were activated after Wnt3a treatment. On the other hand,Wnt3a inhibited the adipogenic differentiation in rMSC through the downregulated expression of CCAAT/enhancer-binding protein alpha (C/EBPalpha)and peroxisome proliferator-activaled receptor gamma (PPARgamma). Furthermore,Wnt3a promoted the migration capacity of rMSC. Conclusion:The results indicate that Wnt3a signaling can induce myogenic differentiation in rMSC. Wnt3a signaling is also involved in the regulation of the proliferation and migration of rMSC. These results could provide a rational foundation for cell-based tissue repair in humans.

  4. Effects of the vegetable polyphenols epigallocatechin-3-gallate, luteolin, apigenin, myricetin, quercetin, and cyanidin in primary cultures of human retinal pigment epithelial cells

    Science.gov (United States)

    Chen, Rui; Grosche, Antje; Reichenbach, Andreas; Wiedemann, Peter; Bringmann, Andreas; Kohen, Leon

    2014-01-01

    Purpose Vegetable polyphenols (bioflavonoids) have been suggested to represent promising drugs for treating cancer and retinal diseases. We compared the effects of various bioflavonoids (epigallocatechin-3-gallate [EGCG], luteolin, apigenin, myricetin, quercetin, and cyanidin) on the physiological properties and viability of cultured human retinal pigment epithelial (RPE) cells. Methods Human RPE cells were obtained from several donors within 48 h of death. Secretion of vascular endothelial growth factor (VEGF) was determined with enzyme-linked immunosorbent assay. Messenger ribonucleic acid levels were determined with real-time reverse transcription polymerase chain reaction. Cellular proliferation was investigated with a bromodeoxyuridine immunoassay, and chemotaxis was examined with a Boyden chamber assay. The number of viable cells was determined by Trypan Blue exclusion. Apoptosis and necrosis rates were determined with a DNA fragmentation enzyme-linked immunosorbent assay. The phosphorylation level of signaling proteins was revealed by western blotting. Results With the exception of EGCG, all flavonoids tested decreased dose-dependently the RPE cell proliferation, migration, and secretion of VEGF. EGCG inhibited the secretion of VEGF evoked by CoCl2-induced hypoxia. The gene expression of VEGF was reduced by myricetin at low concentrations and elevated at higher concentrations. Luteolin, apigenin, myricetin, and quercetin induced significant decreases in the cell viability at higher concentration, by triggering cellular necrosis. Cyanidin reduced the rate of RPE cell necrosis. Myricetin caused caspase-3 independent RPE cell necrosis mediated by free radical generation and activation of calpain and phospholipase A2. The myricetin- and quercetin-induced RPE cell necrosis was partially inhibited by necrostatin-1, a blocker of programmed necrosis. Most flavonoids tested diminished the phosphorylation levels of extracellular signal-regulated kinases 1/2 and Akt

  5. Dexamethasone counteracts the effect of prolactin on islet function: implications for islet regulation in late pregnancy.

    Science.gov (United States)

    Weinhaus, A J; Bhagroo, N V; Brelje, T C; Sorenson, R L

    2000-04-01

    Islets undergo a number of up-regulatory changes to meet the increased demand for insulin during pregnancy, including increased insulin secretion and beta-cell proliferation. It has been shown that elevated lactogenic hormone is directly responsible for these changes, which occur in a phasic pattern, peaking on day 15 of pregnancy and returning to control levels by day 20 (term). As placental lactogen levels remain elevated through late gestation, it was of interest to determine whether glucocorticoids (which increase during late gestation) could counteract the effects of lactogens on insulin secretion, beta-cell proliferation, and apoptosis. We found that insulin secretion measured over 24 h in culture and acute secretion measured over 1 h in response to high glucose were increased at least 2-fold by PRL treatment after 6 days in culture. Dexamethasone (DEX) treatment had a significant inhibitory effect on secretion in a dose-dependent manner at concentrations greater than 1 nM. At 100 nM, a concentration equivalent to the plasma corticosteroid level during late pregnancy, DEX inhibited secretion to below control levels. The addition of DEX (>1 nM) inhibited secretion from PRL-treated islets to levels similar to those produced by DEX treatment alone. Bromodeoxyuridine (10 microM) staining for the final 24 h of a 6-day culture showed that PRL treatment increased cell proliferation 6-fold over the control level. DEX treatment alone (1-1000 nM) did not reduce cell division below the control level, but significantly inhibited the rate of division in PRL-treated islets. YoYo-1, an ultrasensitive fluorescent nucleic acid stain, was added (1 microM; 8 h) to the medium after 1-3 days of culture to examine cell death. Islets examined under confocal microscopy showed that DEX treatment (100 nM) increased the number of cells with apoptotic nuclear morphologies. This was quantified by counting the number of YoYo-labeled nuclei per islet under conventional epifluorescence

  6. The method validation step of biological dosimetry accreditation process

    Energy Technology Data Exchange (ETDEWEB)

    Roy, L.; Voisin, P.A.; Guillou, A.C.; Busset, A.; Gregoire, E.; Buard, V.; Delbos, M.; Voisin, Ph. [Institut de Radioprotection et de Surete Nucleaire, LDB, 92 - Fontenay aux Roses (France)

    2006-07-01

    One of the missions of the Laboratory of Biological Dosimetry (L.D.B.) of the Institute for Radiation and Nuclear Safety (I.R.S.N.) is to assess the radiological dose after an accidental overexposure suspicion to ionising radiation, by using radio-induced changes of some biological parameters. The 'gold standard' is the yield of dicentrics observed in patients lymphocytes, and this yield is converted in dose using dose effect relationships. This method is complementary to clinical and physical dosimetry, for medical team in charge of the patients. To obtain a formal recognition of its operational activity, the laboratory decided three years ago, to require an accreditation, by following the recommendations of both 17025 General Requirements for the Competence of Testing and Calibration Laboratories and 19238 Performance criteria for service laboratories performing biological dosimetry by cyto-genetics. Diagnostics, risks analysis were realized to control the whole analysis process leading to documents writing. Purchases, personnel department, vocational training were also included in the quality system. Audits were very helpful to improve the quality system. One specificity of this technique is that it is not normalized therefore apart from quality management aspects, several technical points needed some validations. An inventory of potentially influent factors was carried out. To estimate their real effect on the yield of dicentrics, a Placket-Burman experimental design was conducted. The effect of seven parameters was tested: the BUdr (bromodeoxyuridine), PHA (phytohemagglutinin) and colcemid concentration, the culture duration, the incubator temperature, the blood volume and the medium volume. The chosen values were calculated according to the uncertainties on the way they were measured i.e. pipettes, thermometers, test tubes. None of the factors has a significant impact on the yield of dicentrics. Therefore the uncertainty linked to their use was

  7. Neuronal c-Abl activation leads to induction of cell cycle and interferon signaling pathways

    Directory of Open Access Journals (Sweden)

    Schlatterer Sarah D

    2012-08-01

    Full Text Available Abstract Background Expression of active c-Abl in adult mouse forebrain neurons in the AblPP/tTA mice resulted in severe neurodegeneration, particularly in the CA1 region of the hippocampus. Neuronal loss was preceded and accompanied by substantial microgliosis and astrocytosis. In contrast, expression of constitutively active Arg (Abl-related gene in mouse forebrain neurons (ArgPP/tTA mice caused no detectable neuronal loss or gliosis, although protein expression and kinase activity were at similar levels to those in the AblPP/tTA mice. Methods To begin to elucidate the mechanism of c-Abl-induced neuronal loss and gliosis, gene expression analysis of AblPP/tTA mouse forebrain prior to development of overt pathology was performed. Selected results from gene expression studies were validated with quantitative reverse transcription PCR , immunoblotting and bromodeoxyuridine (BrdU labeling, and by immunocytochemistry. Results Two of the top pathways upregulated in AblPP/tTA mice with c-Abl expression for 2 weeks were cell cycle and interferon signaling. However, only the expression of interferon signaling pathway genes remained elevated at 4 weeks of c-Abl induction. BrdU incorporation studies confirm that, while the cell cycle pathway is upregulated in AblPP/tTA mice at 2 weeks of c-Abl induction, the anatomical localization of the pathway is not consistent with previous pathology seen in the AblPP/tTA mice. Increased expression and activation of STAT1, a known component of interferon signaling and interferon-induced neuronal excitotoxicity, is an early consequence of c-Abl activation in AblPP/tTA mice and occurs in the CA1 region of the hippocampus, the same region that goes on to develop severe neurodegenerative pathology and neuroinflammation. Interestingly, no upregulation of gene expression of interferons themselves was detected. Conclusions Our data suggest that the interferon signaling pathway may play a role in the pathologic processes

  8. Relationship of the demethylation of the DNA with the induction of the sister chromatid exchanges (SCE) In vivo; Relacion de la desmetilacion del ADN con la induccion de intercambios en las cromatidas hermanas (ICH) In vivo

    Energy Technology Data Exchange (ETDEWEB)

    Toribio E, E

    2005-07-01

    The methylation of the DNA is an epigenetic modification that has an important paper in the regulation of the functionality of the genome of the organisms. It can be altered by demethylation processes, either natural or experimentally induced. The 5-azacytidine (Aza) is a compound that causes the demethylation of the DNA (dm-DNA), inducing with it, expression genic and increase in the frequency of the Sister Chromatid Exchange (SCE). The SCE is a genotoxicity indicator, caused by diverse mutagens and carcinogen. Since the biological meaning and the formation mechanism of this phenomenon has not been totally illustrious, the exploration of the relation between the dm-DNA and the induction of SCE, it could offer new knowledge to explain those queries. The purpose of this work was to study in cells of the mouse bone marrow In vivo, the effect of the Aza on the induction of SCE, based on two aspects: 1) dose answer and 2) the effectiveness of multiple exhibition. To six groups of three to five animals, they are administered Aza to dose of 5, 10, 15 or 20 mg/Kg of weight; in sharp or multiple form, previously to the bromodeoxyuridine supply and 24 h was sacrificed after this; 2 h after an injection with colchicine. Preparations of those metaphases were made, those which were dyed by means of a technique of fluorescence more Giemsa. It was observed that to sharp low dose, the Aza produced an increment in the frequency of SCE that although small it was proportional and statistically significant. To sharp and multiple high doses, the Aza doesn't cause additional increments of SCE, but if toxicity at cellular level and of individuals. It is concluded that a relationship exists between the dm-DNA and the induction of SCE. It is suggested that the total demethylation of the DNA causes 2 SCE/Cell in cells of the mouse bone marrow, or that the cytotoxicity prevents to evidence a bigger induction. (Author)

  9. Loss and recovery of liver regeneration in rats with fulminant hepatic failure.

    Science.gov (United States)

    Eguchi, S; Lilja, H; Hewitt, W R; Middleton, Y; Demetriou, A A; Rozga, J

    1997-10-01

    We earlier described a model of fulminant hepatic failure (FHF) in the rat where partial hepatectomy is combined with induction of right liver lobes necrosis. After this procedure, lack of regenerative response in the residual viable liver tissue (omental lobes) was associated with elevated plasma hepatocyte growth factor (HGF) and transforming growth factor beta (TGF-beta1) levels and delayed expression of HGF and c-met mRNA in the remnant liver. Here, we investigated whether syngeneic isolated hepatocytes transplanted in the spleen will prolong survival and facilitate liver regeneration in FHF rats. Inbred male Lewis rats were used. Group I rats (n = 46) received intrasplenic injection of 2 x 10(7) hepatocytes and 2 days later FHF was induced. Group II FHF rats (n = 46) received intrasplenic injection of saline. Rats undergoing partial hepatectomy of 68% (PH; n = 30) and a sham operation (SO; n = 30) served as controls. In 20 FHF rats (10 rats/group), survival time was determined. The remaining 72 FHF rats (36 rats/group) were used for physiologic studies (liver function and regeneration and plasma growth factor levels). In Group I rats survival was longer than that of Group II controls (73 +/- 22 hr vs. 33 +/- 9 hr; P ammonia, lactate, total bilirubin, PT, and PTT values, lower activity of liver enzymes, and higher monoethylglycinexylidide (MEGX) production than Group II rats. In Group I rats, livers increased in weight at a rate similar to that seen in PH controls and showed distinct mitotic and DNA synthetic activity (incorporation of bromodeoxyuridine and proliferation cell nuclear antigen expression). Plasma HGF and TGF-beta1 levels in these rats decreased and followed the pattern seen in PH rats; additionally, c-met expression in the remnant liver was accelerated. Hepatocyte transplantation prolonged survival in FHF rats and facilitated liver regeneration. Even though the remnant liver increased in weight four times reaching 30% of the original liver mass

  10. A novel human ex vivo model for the analysis of molecular events during lung cancer chemotherapy

    Directory of Open Access Journals (Sweden)

    Lang Dagmar S

    2007-06-01

    Full Text Available Abstract Background Non-small cell lung cancer (NSCLC causes most of cancer related deaths in humans and is characterized by poor prognosis regarding efficiency of chemotherapeutical treatment and long-term survival of the patients. The purpose of the present study was the development of a human ex vivo tissue culture model and the analysis of the effects of conventional chemotherapy, which then can serve as a tool to test new chemotherapeutical regimens in NSCLC. Methods In a short-term tissue culture model designated STST (Short-Term Stimulation of Tissues in combination with the novel *HOPE-fixation and paraffin embedding method we examined the responsiveness of 41 human NSCLC tissue specimens to the individual cytotoxic drugs carboplatin, vinorelbine or gemcitabine. Viability was analyzed by LIFE/DEAD assay, TUNEL-staining and colorimetric MTT assay. Expression of Ki-67 protein and of BrdU (bromodeoxyuridine uptake as markers for proliferation and of cleaved (activated effector caspase-3 as indicator of late phase apoptosis were assessed by immunohistochemistry. Transcription of caspase-3 was analyzed by RT-PCR. Flow cytometry was utilized to determine caspase-3 in human cancer cell lines. Results Viability, proliferation and apoptosis of the tissues were moderately affected by cultivation. In human breast cancer, small-cell lung cancer (SCLC and human cell lines (CPC-N, HEK proliferative capacity was clearly reduced by all 3 chemotherapeutic agents in a very similar manner. Cleavage of caspase-3 was induced in the chemo-sensitive types of cancer (breast cancer, SCLC. Drug-induced effects in human NSCLC tissues were less evident than in the chemo-sensitive tumors with more pronounced effects in adenocarcinomas as compared to squamous cell carcinomas. Conclusion Although there was high heterogeneity among the individual tumor tissue responses as expected, we clearly demonstrate specific multiple drug-induced effects simultaneously. Thus, STST

  11. Comparison of pulmonary and pleural responses of rats and hamsters to inhaled refractory ceramic fibers.

    Science.gov (United States)

    Gelzleichter, T R; Bermudez, E; Mangum, J B; Wong, B A; Janszen, D B; Moss, O R; Everitt, J I

    1999-05-01

    The present study was designed to determine whether pleural fiber burdens or subchronic pleural fibroproliferative and inflammatory changes can help explain the marked interspecies differences in pleural fibrosis and mesothelioma that are observed following long-term inhalation of RCF-1 ceramic fibers by rats and hamsters. Fischer 344 rats and Syrian golden hamsters were exposed to RCF-1 for 4 h per day, 5 days per week, for 12 consecutive weeks. Lung and pleural fiber burdens were characterized during and after exposure. For all time points, approximately 67% of fibers associated with lung tissues from both rats and hamsters were longer than 5 microns in length. In comparison, fibers longer than 5 microns recovered from the pleural compartment, following a 12-week exposure and 12 weeks of recovery, accounted for 13% (hamsters) and 4% (rats) of the distribution. In the 12 weeks after the cessation of exposure, the number of fibers longer than 5 microns in length remained constant in the hamster at approximately 150 fibers per cm2 pleura. This was 2 to 3 times the corresponding fiber surface density in the rat. Significant pulmonary and pleural inflammation was detected at all time points and for both species. DNA synthesis by pleural mesothelial cells was quantified by bromodeoxyuridine uptake following 3 days of labeling. Labeling indices were higher in hamsters than in rats, both for RCF-1-exposed and filtered air-control animals and was highest for the parietal surface of the pleura. Significantly greater collagen deposition was measured in the visceral pleura of hamsters 12 weeks post-exposure but was not significantly elevated in rats. These findings demonstrate that subchronic inhalation exposure to RCF-1 induces pleural inflammation, mesothelial-cell turnover, pleural fibrosis, and an accumulation of fibers with a length greater than 5 microns in the hamster. The accumulation of long fibers in the pleural space may contribute to the pathology observed in the

  12. 11-Oxoeicosatetraenoic acid is a cyclooxygenase-2/15-hydroxyprostaglandin dehydrogenase-derived antiproliferative eicosanoid.

    Science.gov (United States)

    Liu, Xiaojing; Zhang, Suhong; Arora, Jasbir S; Snyder, Nathaniel W; Shah, Sumit J; Blair, Ian A

    2011-12-19

    Previously, we established that 11(R)-hydroxy-5,8,12,14-(Z,Z,E,Z)-eicosatetraenoic acid (HETE) was a significant cyclooxygenase (COX)-2-derived arachidonic acid (AA) metabolite in epithelial cells. Stable isotope dilution chiral liquid chromatography (LC)-electron capture atmospheric pressure chemical ionization (ECAPCI)/mass spectrometry (MS) was used to quantify COX-2-derived eicosanoids in the human colorectal adenocarcinoma (LoVo) epithelial cell line, which expresses both COX-2 and 15-hydroxyprostaglandin dehydrogenase (15-PGDH). 11(R)-HETE secretion reached peak concentrations within minutes after AA addition before rapidly diminishing, suggesting further metabolism had occurred. Surprisingly, recombinant 15-PGDH, which is normally specific for oxidation of eicosanoid 15(S)-hydroxyl groups, was found to convert 11(R)-HETE to 11-oxo-5,8,12,14-(Z,Z,E,Z)-eicosatetraenoic acid (ETE). Furthermore, LoVo cell lysates converted 11(R)-HETE to 11-oxo-ETE and inhibition of 15-PGDH with 5-[[4-(ethoxycarbonyl)phenyl]azo]-2-hydroxy-benzeneacetic acid (CAY10397) (50 μM) significantly suppressed endogenous 11-oxo-ETE production with a corresponding increase in 11(R)-HETE. These data confirmed COX-2 and 15-PGDH as enzymes responsible for 11-oxo-ETE biosynthesis. Finally, addition of AA to the LoVo cells resulted in rapid secretion of 11-oxo-ETE into the media, reaching peak levels within 20 min of starting the incubation. This was followed by a sharp decrease in 11-oxo-ETE levels. Glutathione (GSH) S-transferase (GST) was found to metabolize 11-oxo-ETE to the 11-oxo-ETE-GSH (OEG)-adduct in LoVo cells, as confirmed by LC-MS/MS analysis. Bromodeoxyuridine (BrdU)-based cell proliferation assays in human umbilical vein endothelial cells (HUVECs) revealed that the half-maximal inhibitory concentration (IC(50)) of 11-oxo-ETE for inhibition of HUVEC proliferation was 2.1 μM. These results show that 11-oxo-ETE is a novel COX-2/15-PGDH-derived eicosanoid, which inhibits endothelial

  13. The bradykinin B2 receptor induces multiple cellular responses leading to the proliferation of human renal carcinoma cell lines

    Directory of Open Access Journals (Sweden)

    Kramarenko II

    2012-07-01

    Full Text Available Inga I Kramarenko1, Thomas A Morinelli1,2, Marlene A Bunni1,2, John R Raymond Sr3, Maria N Garnovskaya11Department of Medicine (Nephrology Division, Medical University of South Carolina, Charleston, SC, USA; 2Medical and Research Services of the Ralph H Johnson Veterans Affairs Medical Center, Charleston, SC, USA; 3Medical College of Wisconsin, Milwaukee, WI, USABackground: The vasoactive peptide bradykinin (BK acts as a potent growth factor for normal kidney cells, but there have been few studies on the role of BK in renal cell carcinomas.Purpose: In this study, we tested the hypothesis that BK also acts as a mitogen in kidney carcinomas, and explored the effects of BK in human renal carcinoma A498 cells.Methods: The presence of mRNAs for BK B1 and BK B2 receptors in A498 cells was demonstrated by reverse transcription–polymerase chain reaction. To study BK signaling pathways, we employed fluorescent measurements of intracellular Ca2+, measured changes in extracellular pH as a reflection of Na+/H+ exchange (NHE with a Cytosensor microphysiometer, and assessed extracellular signal-regulated kinase (ERK activation by Western blotting.Results: Exposure to 100 nM of BK resulted in the rapid elevation of intracellular Ca2+, caused a ≥30% increase in NHE activity, and a ≥300% increase in ERK phosphorylation. All BK signals were blocked by HOE140, a BK B2 receptor antagonist, but not by a B1 receptor antagonist. Inhibitor studies suggest that BK-induced ERK activation requires phospholipase C and protein kinase C activities, and is Ca2+/calmodulin-dependent. The amiloride analog 5-(N-methyl-N-isobutyl-amiloride (MIA blocked short-term NHE activation and inhibited ERK phosphorylation, suggesting that NHE is critical for ERK activation by BK. BK induced an approximately 40% increase in the proliferation of A498 cells as assessed by bromodeoxyuridine uptake. This effect was blocked by the ERK inhibitor PD98059, and was dependent on NHE activity

  14. The caudal regeneration blastema is an accumulation of rapidly proliferating stem cells in the flatworm Macrostomum lignano

    Directory of Open Access Journals (Sweden)

    Adamski Zbigniew

    2009-07-01

    Full Text Available Abstract Background Macrostomum lignano is a small free-living flatworm capable of regenerating all body parts posterior of the pharynx and anterior to the brain. We quantified the cellular composition of the caudal-most body region, the tail plate, and investigated regeneration of the tail plate in vivo and in semithin sections labeled with bromodeoxyuridine, a marker for stem cells (neoblasts in S-phase. Results The tail plate accomodates the male genital apparatus and consists of about 3,100 cells, about half of which are epidermal cells. A distinct regeneration blastema, characterized by a local accumulation of rapidly proliferating neoblasts and consisting of about 420 cells (excluding epidermal cells, was formed 24 hours after amputation. Differentiated cells in the blastema were observed two days after amputation (with about 920 blastema cells, while the male genital apparatus required four to five days for full differentiation. At all time points, mitoses were found within the blastema. At the place of organ differentiation, neoblasts did not replicate or divide. After three days, the blastema was made of about 1420 cells and gradually transformed into organ primordia, while the proliferation rate decreased. The cell number of the tail plate, including about 960 epidermal cells, was restored to 75% at this time point. Conclusion Regeneration after artificial amputation of the tail plate of adult specimens of Macrostomum lignano involves wound healing and the formation of a regeneration blastema. Neoblasts undergo extensive proliferation within the blastema. Proliferation patterns of S-phase neoblasts indicate that neoblasts are either determined to follow a specific cell fate not before, but after going through S-phase, or that they can be redetermined after S-phase. In pulse-chase experiments, dispersed distribution of label suggests that S-phase labeled progenitor cells of the male genital apparatus undergo further proliferation before

  15. Dietary effects of ortho-phenylphenol and sodium ortho-phenylphenate on rat urothelium.

    Science.gov (United States)

    St John, M K; Arnold, L L; Anderson, T; Cano, M; Johansson, S L; Cohen, S M

    2001-02-01

    Ortho-phenylphenol (OPP) and sodium ortho-phenylphenate (NaOPP) are pesticides used commercially in the food industry that have been shown to be carcinogenic to rat urothelium. Dietary administration of 1.25% OPP or 2.0% NaOPP caused increased incidences of urothelial hyperplasia and eventually caused tumors in male F344 rats, with NaOPP apparently having a more potent effect. In other studies, various sodium salts such as saccharin and ascorbate enhanced bladder carcinogenesis, although the acid forms of these salts did not. In studies with high dietary doses of these sodium salts, an amorphous precipitate was produced in the urine; precipitate formation was pH dependent. In previous experiments in which high doses of OPP were fed for up to 17 weeks, severe hyperplasia of the urothelium was produced, but without the formation of an urinary amorphous precipitate, calculi, or abnormal microcrystalluria. In addition, we found no evidence of OPP-DNA adduct formation in the urothelium. The present study was conducted to determine if feeding NaOPP * 4 H(2)0 to male F344 rats as 2.0% of the diet resulted in the formation of an amorphous precipitate in the urine, and if NaOPP caused an increased mineral concentration in the urine and/or kidneys. NaOPP administration produced a higher urinary pH than did OPP fed as 1.25% of the diet. Neither amorphous precipitate nor other solids were observed in the urine of the OPP or NaOPP-treated rats, and urinary calcium concentrations in the treated groups were similar to control. OPP and NaOPP had similar proliferative effects on rat urothelium after 10 weeks of treatment by light microscopy, scanning electron microscopy (SEM), and bromodeoxyuridine (BrdU) labeling indices. The results of this study indicate that formation of abnormal urinary solids is not part of the mechanism by which OPP or NaOPP exert their effects on the rat bladder epithelium.

  16. Chemokine stromal cell-derived factor 1/CXCL12 increases homing of mesenchymal stem cells to injured myocardium and neovascularization following myocardial infarction

    Institute of Scientific and Technical Information of China (English)

    ZHUANG Yu; CHEN Xin; XU Ming; ZHANG Lei-yang; XIANG Fei

    2009-01-01

    Background Heart failure due to ischemic heart disease is still a major health problem. Myocardium regeneration emerges as a novel therapeutic method for treating myocardial infarction (MI). However, it is affected by many factors. The present study was aimed to investigate the effect of chemokine stromal cell-derived factor 1 (SDF-1)/CXCL12 on mesenchymal stem cells (MSCs) homing to injured myocardium in a rat myocardial infarction model. Methods A rat myocardial infarction model was established by permanent left anterior descending branch ligation. Mesenchymal stem cells from donor rats were cultured in IMDM and labeled with bromodeoxyuridine. The rats were divided into two groups. SDF-1 expression was measured by in situ hybridization and immunohistochemistry in the sham operated or infarcted hearts at 1, 2, 4, 7, 14 and 28 days post operation in the SDF-1 detection group. The rats in the intervention groups were injected with SDF-1, anti-SDF-1 antibody or saline 4 days after myocardial infarction. Then, a total of 5x106 cells in 2.5 ml of phosphate-buffered saline were injected through the tail vein. The number of the labeled MSCs in the infarcted hearts was counted on the 3rd clay post injection. Cardiac function and blood vessel density were assessed on the 28th day post injection. Results Self-generating SDF-1 expression was increased at the first day post MI, peaked at the 7th day and decreased thereafter while it remained unchanged in sham operated hearts. The MSCs enrichment in the host hearts were more abundant in the MI groups than in the non-MI group (P=0.000); the MSCs enrichment in the host hearts were more abundant in the SDF-1 injected group than in the anti-SDF-1 antibody and saline injected groups (P = 0.000). Cardiac function was improved more in the SDF-1 injected group than in the anti-SDF-1 antibody and saline injected groups (P = 0.000). Neovascularization in the SDF-1 injected group increased significantly compared to the other groups (P

  17. Hair cell-like cells generation induced by nature culture of cochlear sensory epithelia in rat%小鼠耳蜗感觉上皮细胞的自然培养诱导毛细胞的产生

    Institute of Scientific and Technical Information of China (English)

    刘晖; 李胜利; 朱宏亮; 姚小宝; 王晓侠

    2003-01-01

    Object To establish rat auditory epithelial cell culture and try to find precursor cells of auditory hair cells in vitro and apply them to study mammalian hair cell regeneration.Methods With refinement of culture media and techniques,cochlear sensory epithelial cells of rat were cultured.Immunocytochemistry and Bromodeoxyuridine(BrdU)labeling were used to detect properties and mitotic status of cultured cells.Results The cultured auditory epithelial cells showed a large,flat epithelial morphotype and expressed F-actin and cytokerafin,a subset of cells generated from auditory epithelium were labeled by calretinin, a specific marker of early hair cell.The appearance of calretinin-positive cells were also confirmed in 3rd passage culture by immunostaining.Conclusions Postnatal rat auditory epithelium can be induced to generate hair cell-like cells by nature culture,this phenomenon suggested thatprogenitor cells may exist in rat cochlea and they may give birth to new hair cells. Whether these progenitor cells are tissue specific stem cells was still need more study.%目的培养小鼠耳蜗上皮细胞,寻找听觉毛细胞的前体细胞,从而研究听觉毛细胞的再生.方法改良细胞培养基和培养技术,建立小鼠耳蜗听觉上皮细胞的培养;用免疫细胞化学方法和BrdU标记法检测培养细胞的性质和分裂状态.结果培养的听觉上皮细胞表现为大而扁平的上皮细胞形态,并且表达上皮细胞的标志F-actin和cytokeratin,部分新生的细胞可被早期毛细胞的特异标志calretinin着染,表明有听毛细胞样的细胞产生.这种现象经3次传代培养后仍然存在.结论自然细胞培养方法可能诱导小鼠听觉毛细胞的产生,在小鼠的耳蜗内可能存在听觉毛细胞的前体细胞,而这些前体细胞是否是组织特异性干细胞还需要更进一步的研究.

  18. Salvianolic acid B promotes survival of transplanted mesenchymal stem cells in spinal cord-injured rats

    Institute of Scientific and Technical Information of China (English)

    Xiao-bin BI; Yu-bin DENG; Dan-hui GAN; Ya-zhu WANG

    2008-01-01

    Aim: Stem cells hold great promise for brain and spinal cord injuries (SCI), but cell survival following transplantation to adult central nervous system has been poor. Salvianolic acid B (Sal B) has been shown to improve functional recovery in brain-injured rats. The present study was designed to determine whether Sal B could improve transplanted mesenchymal stem cell (MSC) survival in SCI rats. Methods: SCI rats were treated with Sal B. The Basso-Beatie-Bresnahan (BBB) scale was used to test the functional recovery. Sal B was used to protect MSC from being damaged by TNF-α in vitro. Bromodeoxyuridine-labeled MSC were transplanted into SCI rats with Sal B intraperitoneal injection, simul-taneously. MSC were examined, and the functional recovery of the SCI rats was tested. Results: Sal B treatment significantly reduced the lesion area from 0.26±0.05 mm2 to 0.15±0.03 mm2 (P<0.01) and remarkably raised the BBB scores on d 28, post-injury, from 7.3±0.9 to 10.5±1.3 (P<0.05), compared with the phosphate-buffered saline (PBS) control group. MSC were protected from the damage of TNF-α by Sal B. The number of surviving MSC in the MSC plus Sal B groups were 1143.3± 195.6 and 764.0±81.3 on d 7 and 28, post-transplantation, more than those in the MSC group, which was 569.3±72.3 and 237.0±61.3, respectively (P<0.05). Rats with MSC trans-planted and Sal B injected obtained higher BBB scores than those with MSC transplanted alone (P<0.05) and PBS (P<0.01). Conclusion: Sal B provides neuroprotection to SCI and promotes the survival of MSC in vitro and after cell transplantation to the injured spinal cord in vivo.

  19. Testicular involution prior to sex change in gilthead seabream is characterized by a decrease in DMRT1 gene expression and by massive leukocyte infiltration

    Directory of Open Access Journals (Sweden)

    Meseguer José

    2007-06-01

    Full Text Available Abstract Background Leukocytes are found within the testis of most, if not all, mammals and are involved in immunological surveillance, physiological regulation and tissue remodelling. The testis of seasonal breeding fish undergoes a regression process. In the present study, the second reproductive cycle (RC of the protandrous seasonal teleost fish, gilthead seabream, was investigated and the presence of leukocytes analysed. Special attention has been paid to the testicular degenerative process which is particularly active in the last stage of the second RC probably due to the immediacy of the sex change process. Methods Sexually mature specimens (n = 10–18 fish/month were sampled during the second RC. Some specimens were intraperitoneally injected with bromodeoxyuridin (BrdU before sampling. Light and electron microscopy was used to determine the different stages of gonadal development and the presence of leukocytes and PCR was used to analyse the gene expression of a testis-differentiating gene and of specific markers for macrophages and B and T lymphocytes. Immunocytochemistry and flow cytometry were performed using a specific antibody against acidophilic granulocytes from the gilthead seabream. Cell proliferation was detected by immunocytochemistry using an anti-BrdU antibody and apoptotic cells by in situ detection of DNA fragmentation. Results The fish in the western Mediterranean area developed as males during the first two RCs. The testis of all the specimens during the second RC underwent a degenerative process, which started at post-spawning and was enhanced during the testicular involution stage, when vitellogenic oocytes appeared in the ovary accompanied by a progressive increase in the ovarian index. However, only 40% of specimens were females in the third RC. Leukocytes (acidophilic granulocytes, macrophages and lymphocytes were present in the gonad and acidophilic granulocyte infiltration occurred during the last two stages. At

  20. The olfactory bulb in newborn piglet is a reservoir of neural stem and progenitor cells.

    Directory of Open Access Journals (Sweden)

    Lee J Martin

    Full Text Available The olfactory bulb (OB periventricular zone is an extension of the forebrain subventricular zone (SVZ and thus is a source of neuroprogenitor cells and neural stem cells. While considerable information is available on the SVZ-OB neural stem cell (NSC/neuroprogenitor cell (NPC niche in rodents, less work has been done on this system in large animals. The newborn piglet is used as a preclinical translational model of neonatal hypoxic-ischemic brain damage, but information about the endogenous sources of NSCs/NPCs in piglet is needed to implement endogenous or autologous cell-based therapies in this model. We characterized NSC/NPC niches in piglet forebrain and OB-SVZ using western blotting, histological, and cell culture methods. Immunoblotting revealed nestin, a NSC/NPC marker, in forebrain-SVZ and OB-SVZ in newborn piglet. Several progenitor or newborn neuron markers, including Dlx2, musashi, doublecortin, and polysialated neural cell adhesion molecule were also detected in OB-SVZ by immunoblotting. Immunohistochemistry confirmed the presence of nestin, musashi, and doublecortin in forebrain-SVZ and OB-SVZ. Bromodeoxyuridine (BrdU labeling showed that the forebrain-SVZ and OB-SVZ accumulate newly replicated cells. BrdU-positive cells were immunolabeled for astroglial, oligodendroglial, and neuronal markers. A lateral migratory pathway for newly born neuron migration to primary olfactory cortex was revealed by BrdU labeling and co-labeling for doublecortin and class III β tubulin. Isolated and cultured forebrain-SVZ and OB-SVZ cells from newborn piglet had the capacity to generate numerous neurospheres. Single cell clonal analysis of neurospheres revealed the capacity for self-renewal and multipotency. Neurosphere-derived cells differentiated into neurons, astrocytes, and oligodendrocytes and were amenable to permanent genetic tagging with lentivirus encoding green fluorescent protein. We conclude that the piglet OB-SVZ is a reservoir of NSCs

  1. Temporal patterns of broad isoform expression during the development of neuronal lineages in Drosophila

    Directory of Open Access Journals (Sweden)

    Williams Darren W

    2009-11-01

    Full Text Available Abstract Background During the development of the central nervous system (CNS of Drosophila, neuronal stem cells, the neuroblasts (NBs, first generate a set of highly diverse neurons, the primary neurons that mature to control larval behavior, and then more homogeneous sets of neurons that show delayed maturation and are primarily used in the adult. These latter, 'secondary' neurons show a complex pattern of expression of broad, which encodes a transcription factor usually associated with metamorphosis, where it acts as a key regulator in the transitions from larva and pupa. Results The Broad-Z3 (Br-Z3 isoform appears transiently in most central neurons during embryogenesis, but persists in a subset of these cells through most of larval growth. Some of the latter are embryonic-born secondary neurons, whose development is arrested until the start of metamorphosis. However, the vast bulk of the secondary neurons are generated during larval growth and bromodeoxyuridine incorporation shows that they begin expressing Br-Z3 about 7 hours after their birth, approximately the time that they have finished outgrowth to their initial targets. By the start of metamorphosis, the oldest secondary neurons have turned off Br-Z3 expression, while the remainder, with the exception of the very youngest, maintain Br-Z3 while they are interacting with potential partners in preparation for neurite elaboration. That Br-Z3 may be involved in early sprouting is suggested by ectopically expressing this isoform in remodeling primary neurons, which do not normally express Br-Z3. These cells now sprout into ectopic locations. The expression of Br-Z3 is transient and seen in all interneurons, but two other isoforms, Br-Z4 and Br-Z1, show a more selective expression. Analysis of MARCM clones shows that the Br-Z4 isoform is expressed by neurons in virtually all lineages, but only in those cells born during a window during the transition from the second to the third larval

  2. Promotion versus suppression of rat colon carcinogenesis by chlorophyllin and chlorophyll: modulation of apoptosis, cell proliferation, and {beta}-catenin/Tcf signaling

    Energy Technology Data Exchange (ETDEWEB)

    Blum, Carmen A.; Xu Meirong; Orner, Gayle A.; Dario Diaz, G.; Li Qingjie; Dashwood, Wan Mohaiza; Bailey, George S.; Dashwood, Roderick H

    2003-03-01

    The carcinogens 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) and 1,2-dimethylhydrazine (DMH) induce colon tumors in the rat that contain mutations in {beta}-catenin, but the mutation pattern can be influenced by exposure to dietary phytochemicals, such as the water-soluble derivative of chlorophyll called chlorophyllin. Whereas chlorophyllin is an effective blocking agent during the initiation phase, post-initiation responses depend upon the exposure protocol, and can be influenced by the initiating agent and the concentration of chlorophyllin. Post-initiation treatment with 0.001% chlorophyllin (w/v) in the drinking water promoted colon carcinogenesis in the rat, but much higher concentrations (1.0% chlorophyllin) led to suppression. Bromodeoxyuridine and terminal deoxynucleotidyl transferase-mediated nick end labeling (TUNEL) indices revealed that the promotional concentration of 0.001% chlorophyllin increased the ratio of cell proliferation to apoptosis in the colonic crypts, whereas concentrations in the range 0.01-1.0% chlorophyllin modestly reduced this ratio. Molecular studies showed that the spectrum of {beta}-catenin mutations was markedly different in chlorophyllin-promoted colon tumors--many of the mutations led to direct substitutions of critical Ser/Thr residues within the glycogen synthase kinase-3{beta} (GSK-3{beta}) region, whereas in all other groups, including DMH and IQ controls, the mutations typically affected amino acids adjacent to Ser{sup 33}. Substitution of critical Ser/Thr residues caused {beta}-catenin and c-Jun proteins to be markedly over-expressed compared with tumors in which the mutations substituted amino acid residues flanking these critical Ser/Thr sites. In a separate study, rats were exposed to IQ or azoxymethane (AOM), a metabolite of DMH, and they were treated post-initiation with chlorophyllin, chlorophyll, copper, or phytol in the diet. Natural chlorophyll (0.08%) suppressed AOM- and IQ-induced aberrant crypt foci (ACF

  3. Promotion versus suppression of rat colon carcinogenesis by chlorophyllin and chlorophyll: modulation of apoptosis, cell proliferation, and beta-catenin/Tcf signaling.

    Science.gov (United States)

    Blum, Carmen A; Xu, Meirong; Orner, Gayle A; Darío Díaz, G; Li, Qingjie; Dashwood, Wan Mohaiza; Bailey, George S; Dashwood, Roderick H

    2003-01-01

    The carcinogens 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) and 1,2-dimethylhydrazine (DMH) induce colon tumors in the rat that contain mutations in beta-catenin, but the mutation pattern can be influenced by exposure to dietary phytochemicals, such as the water-soluble derivative of chlorophyll called chlorophyllin. Whereas chlorophyllin is an effective blocking agent during the initiation phase, post-initiation responses depend upon the exposure protocol, and can be influenced by the initiating agent and the concentration of chlorophyllin. Post-initiation treatment with 0.001% chlorophyllin (w/v) in the drinking water promoted colon carcinogenesis in the rat, but much higher concentrations (1.0% chlorophyllin) led to suppression. Bromodeoxyuridine and terminal deoxynucleotidyl transferase-mediated nick end labeling (TUNEL) indices revealed that the promotional concentration of 0.001% chlorophyllin increased the ratio of cell proliferation to apoptosis in the colonic crypts, whereas concentrations in the range 0.0l-1.0% chlorophyllin modestly reduced this ratio. Molecular studies showed that the spectrum of beta-catenin mutations was markedly different in chlorophyllin-promoted colon tumors--many of the mutations led to direct substitutions of critical Ser/Thr residues within the glycogen synthase kinase-3beta (GSK-3beta) region, whereas in all other groups, including DMH and IQ controls, the mutations typically affected amino acids adjacent to Ser(33). Substitution of critical Ser/Thr residues caused beta-catenin and c-Jun proteins to be markedly over-expressed compared with tumors in which the mutations substituted amino acid residues flanking these critical Ser/Thr sites. In a separate study, rats were exposed to IQ or azoxymethane (AOM), a metabolite of DMH, and they were treated post-initiation with chlorophyllin, chlorophyll, copper, or phytol in the diet. Natural chlorophyll (0.08%) suppressed AOM- and IQ-induced aberrant crypt foci (ACF), whereas

  4. Human placenta-derived adherent cell treatment of experimental stroke promotes functional recovery after stroke in young adult and older rats.

    Directory of Open Access Journals (Sweden)

    Amjad Shehadah

    Full Text Available BACKGROUND: Human Placenta-Derived Adherent Cells (PDAC® are a novel mesenchymal-like cell population derived from normal human placental tissue. PDA-001 is a clinical formulation of PDAC® developed for intravenous administration. In this study, we investigated the efficacy of PDA-001 treatment in a rat model of transient middle cerebral artery occlusion (MCAo in young adult (2-3 month old and older rats (10-12 months old. METHODS: To evaluate efficacy and determine the optimal number of transplanted cells, young adult Wistar rats were subjected to MCAo and treated 1 day post MCAo with 1×10(6, 4×10(6 or 8×10(6 PDA-001 cells (i.v., vehicle or cell control. 4×10(6 or 8×10(6 PDA-001 cells were also tested in older rats after MCAo. Treatment response was evaluated using a battery of functional outcome tests, consisting of adhesive-removal test, modified Neurological Severity Score (mNSS and foot-fault test. Young adult rats were sacrificed 56 days after MCAo, older rats were sacrificed 29 days after MCAo, and lesion volumes were measured using H&E. Immunohistochemical stainings for bromodeoxyuridine (BrdU and von Willebrand Factor (vWF, and synaptophysin were performed. RESULTS: In young adult rats, treatment with 4×10(6 PDA-001 cells significantly improved functional outcome after stroke (p<0.05. In older rats, significant functional improvement was observed with PDA-001 cell therapy in both of the 4×10(6 and 8×10(6 treatment groups. Functional benefits in young adult and older rats were associated with significant increases in the number of BrdU immunoreactive endothelial cells, vascular density and perimeter in the ischemic brain, as well as significantly increased synaptophysin expression in the ischemic border zone (p<0.05. CONCLUSION: PDA-001 treatment significantly improved functional outcome after stroke in both young adult and older rats. The neurorestorative effects induced by PDA-001 treatment may be related to increased

  5. Attenuation of reactive gliosis does not affect infarct volume in neonatal hypoxic-ischemic brain injury in mice.

    Directory of Open Access Journals (Sweden)

    Katarina Järlestedt

    Full Text Available BACKGROUND: Astroglial cells are activated following injury and up-regulate the expression of the intermediate filament proteins glial fibrillary acidic protein (GFAP and vimentin. Adult mice lacking the intermediate filament proteins GFAP and vimentin (GFAP(-/-Vim(-/- show attenuated reactive gliosis, reduced glial scar formation and improved regeneration of neuronal synapses after neurotrauma. GFAP(-/-Vim(-/- mice exhibit larger brain infarcts after middle cerebral artery occlusion suggesting protective role of reactive gliosis after adult focal brain ischemia. However, the role of astrocyte activation and reactive gliosis in the injured developing brain is unknown. METHODOLOGY/PRINCIPAL FINDINGS: We subjected GFAP(-/-Vim(-/- and wild-type mice to unilateral hypoxia-ischemia (HI at postnatal day 9 (P9. Bromodeoxyuridine (BrdU; 25 mg/kg was injected intraperitoneally twice daily from P9 to P12. On P12 and P31, the animals were perfused intracardially. Immunohistochemistry with MAP-2, BrdU, NeuN, and S100 antibodies was performed on coronal sections. We found no difference in the hemisphere or infarct volume between GFAP(-/-Vim(-/- and wild-type mice at P12 and P31, i.e. 3 and 22 days after HI. At P31, the number of NeuN(+ neurons in the ischemic and contralateral hemisphere was comparable between GFAP(-/-Vim(-/- and wild-type mice. In wild-type mice, the number of S100(+ astrocytes was lower in the ipsilateral compared to contralateral hemisphere (65.0+/-50.1 vs. 85.6+/-34.0, p<0.05. In the GFAP(-/-Vim(-/- mice, the number of S100(+ astrocytes did not differ between the ischemic and contralateral hemisphere at P31. At P31, GFAP(-/-Vim(-/- mice showed an increase in NeuN(+BrdU(+ (surviving newly born neurons in the ischemic cortex compared to wild-type mice (6.7+/-7.7; n = 29 versus 2.9+/-3.6; n = 28, respectively, p<0.05, but a comparable number of S100(+BrdU(+ (surviving newly born astrocytes. CONCLUSIONS/SIGNIFICANCE: Our results suggest that

  6. Carbon nanotubes impregnated with subventricular zone neural progenitor cells promotes recovery from stroke

    Directory of Open Access Journals (Sweden)

    Moon SU

    2012-06-01

    Full Text Available Sung Ung Moon,1,* Jihee Kim,1,2,* Kiran Kumar Bokara,1,* Jong Youl Kim,1 Dongwoo Khang,3,4 Thomas J Webster,3,4 Jong Eun Lee1,21Department of Anatomy, 2Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; 3School of Engineering, 4Department of Orthopedics, Brown University, Providence, RI, USA*These authors contributed equally to this workAbstract: The present in vivo study was conducted to evaluate whether hydrophilic (HL or hydrophobic (HP carbon nanotubes (CNTs impregnated with subventricular zone neural progenitor cells (SVZ NPCs could repair damaged neural tissue following stroke. For this purpose, stroke damaged rats were transplanted with HL CNT-SVZ NPCs, HP CNT-SVZ NPCs, or SVZ NPCs alone for 1, 3, 5, and 8 weeks. Results showed that the HP CNT-SVZ NPC transplants improved rat behavior and reduced infarct cyst volume and infarct cyst area compared with the experimental control and the HL CNT-SVZ NPC and SVZ NPCs alone groups. The transplantation groups showed an increase in the expression of nestin (cell stemness marker and proliferation which was evident with the increased number of doublecortin and bromodeoxyuridine double-stained immunopositive cells around the lesion site. But, these effects were more prominent in the HP CNT-SVZ NPC group compared with the other transplantation groups. The HP CNT-SVZ NPC and HL CNT-SVZ NPC transplants increased the number of microtubule-associated protein 2 (marker for neurons and decreased the number of glial fibrillary acidic protein (marker for astroglial cells positive cells within the injury epicenter. The majority of the transplanted HP CNT-SVZ NPCs collectively broadened around the ischemic injured region and the SVZ NPCs differentiated into mature neurons, attained the synapse morphology (TUJ1, synaptophysin, and decreased microglial activation (CD11b/c [OX-42]. For these reasons, this study provided the first evidence that CNTs can improve

  7. Activin A suppressed hepatic oval cell-mediated liver regeneration in vivo%Activin A抑制卵圆细胞介导肝再生的体内研究

    Institute of Scientific and Technical Information of China (English)

    陈琳; 周巧丹; 丁则阳; 张伟; 张必翔; 梁慧芳; 陈孝平

    2012-01-01

    Objective To study the inhibitory effect and mechanism of Activin A on hepatic oval cell-mediated liver regeneratioa Methods 2-acetylaminofluorene/partial hepatectomy (2-AAF/PH) o-val cell-mediated liver regeneration model was established. One μg Activin A (Activin A group) or normal saline (control S group) was infused into portal vein immediately after 70 % partial hepatectomy. Animals were sacrificed at 2nd, 4th, 6th, and 9th day after hepatectomy. Liver regeneration rate was measured. Changes in Pan-CK positive oval cell number and nuclear bromodeoxyuridine labeling were detected by using immunohistochemistry. The expression of phosphorylated smad2, p15, and p21 were detected by using Western blotting. Results As compared with control group, the Pan-CK positive number was significantly reduced in Activin A group at 6th and 9th day after hepatectomy,and Brdu labeling nuclear number was reduced in Activin A group at 4th,6th and 9th day after hepatectomy. The liver regeneration rate in Activin A group was lower than in control group. Higher levels of phosphorylated smad2,p15 and p21 were detected in Activin A group. Conclusion Activin A could suppress o-val cell-mediated liver regeneration through smad pathway-dependent up-regulation of p15 and p21.%目的 研究Activin A对卵圆细胞介导肝再生的抑制作用及其机制.方法 建立2-乙酰胺基芴/部分肝切除卵圆细胞介导肝再生模型,肝切除后立即经门静脉注射1 μg Activin A(Activin A组),或生理盐水(对照组).肝切除后不同时间点取肝脏标本检测卵圆细胞增殖及肝再生率和磷酸化smad2,p15和p21的表达.结果 Activin A组肝脏中卵圆细胞的增殖及肝再生率均明显低于对照组;Activin A组肝脏中smad2的磷酸化水平及p15,p21的表达水平均高于对照组.结论 Activin A可以通过smad信号通路抑制卵圆细胞介导的肝再生.

  8. Characterization of the early proliferative response of the rodent bladder to subtotal cystectomy: a unique model of mammalian organ regeneration.

    Directory of Open Access Journals (Sweden)

    Charles C Peyton

    Full Text Available Subtotal cystectomy (STC; surgical removal of ∼75% of the rat urinary bladder elicits a robust proliferative response resulting in complete structural and functional bladder regeneration within 8-weeks. The goal of these studies was to characterize the early cellular response that mediates this regenerative phenomenon, which is unique among mammalian organ systems. STC was performed on eighteen 12-week-old female Fischer F344 rats. At 1, 3, 5 and 7-days post-STC, the bladder was harvested 2-hours after intraperitoneal injection of bromodeoxyuridine (BrdU. Fluorescent BrdU labeling was quantified in cells within the urothelium, lamina propria (LP, muscularis propria (MP and serosa. Cell location was confirmed with fluorescently co-labeled cytokeratin, vimentin or smooth muscle actin (SMA, to identify urothelial, interstitial and smooth muscle cells, respectively. Expression of sonic hedgehog (Shh, Gli-1 and bone morphogenic factor-4 (BMP-4 were evaluated with immunochemistry. Three non-operated rats injected with BrdU served as controls. Less than 1% of cells in the bladder wall were labeled with BrdU in control bladders, but this percentage significantly increased by 5-8-fold at all time points post-STC. The spatiotemporal characteristics of the proliferative response were defined by a significantly higher percentage of BrdU-labeled cells within the urothelium at 1-day than in the MP and LP. A time-dependent shift at 3 and 5-days post-STC revealed significantly fewer BrdU-labeled cells in the MP than LP or urothelium. By 7-days the percentage of BrdU-labeled cells was similar among urothelium, LP and MP. STC also caused an increase in immunostaining for Shh, Gli-1 and BMP-4. In summary, the early stages of functional bladder regeneration are characterized by time-dependent changes in the location of the proliferating cell population, and expression of several evolutionarily conserved developmental signaling proteins. This report extends

  9. Development of the rostral migratory stream and its cell apoptosis%喙端迁移流的发生及其细胞凋亡

    Institute of Scientific and Technical Information of China (English)

    厉永强; 商超蔚; 宋敏; 高文静; 石贞玉; 邓锦波

    2012-01-01

    目的 研究生后不同日龄小鼠喙端迁移流(RMS)的发育,神经干细胞增殖和凋亡的规律. 方法 利用Caspase-8免疫荧光标记法和5'-溴脱氧尿嘧啶核苷(BrdU)法,对小鼠RMS内的神经干细胞增殖和凋亡进行研究(n=92). 结果 生后早期小鼠脑内,尤其是室管下区(SVZ)和RMS,存在大量的增殖细胞.随着小鼠年龄的增加,脑内干细胞逐渐减少,到成年,大脑皮质几乎见不到增殖的神经干细胞,但在SVZ和RMS仍可以看到许多增殖的神经干细胞.在RMS,神经干细胞增殖的同时伴随着细胞凋亡,干细胞的增殖与凋亡存在着正相关关系.结论 RMS的神经干细胞增殖与凋亡有重要的生理意义,通过细胞凋亡,RMS可以调节神经干细胞向嗅球迁移的数量,也可以调节干细胞向颗粒细胞分化.%Objective To study the development of the rostral migratory stream (RMS) of mice and the proliferation and apoptosis of neural stem cells in RMS at various postnatal ages. Methods With 5-bromodeoxyuridine (BrdU) assay and Caspase-8 immunofluorescent staining, the neuroproliferation and cell apoptosis in RMS were investigated. Results In early postnatal phase, there were many proliferative cells in the brain, especially in subventricular zone (SVZ) and RMS. With age increasing, the stem cells in the brain decreased. In the adult, the stem cells in the neocortex were hardly found except in SVZ and RMS areas. When the proliferation of stem cells was companied with apoptosis during RMS development, there was a positive correlation between cell proliferation and apoptosis. Conclusion There is an important signification for the neuroproliferation and cell apoptosis in RMS. Through cell apoptosis, the migration and differentiation of neural stem cells in RMS are regulated.

  10. LXA{sub 4} actions direct fibroblast function and wound closure

    Energy Technology Data Exchange (ETDEWEB)

    Herrera, Bruno S. [Department of Applied Oral Sciences, Center for Periodontology, The Forsyth Institute, Cambridge, MA (United States); Microbiology Branch, US Army Dental and Trauma Research Detachment, Institute of Surgical Research, JBSA Fort Sam Houston, TX (United States); Kantarci, Alpdogan; Zarrough, Ahmed; Hasturk, Hatice [Department of Applied Oral Sciences, Center for Periodontology, The Forsyth Institute, Cambridge, MA (United States); Leung, Kai P., E-mail: kai.p.leung.civ@mail.mil [Microbiology Branch, US Army Dental and Trauma Research Detachment, Institute of Surgical Research, JBSA Fort Sam Houston, TX (United States); Van Dyke, Thomas E., E-mail: tvandyke@forsyth.org [Department of Applied Oral Sciences, Center for Periodontology, The Forsyth Institute, Cambridge, MA (United States)

    2015-09-04

    Timely resolution of inflammation is crucial for normal wound healing. Resolution of inflammation is an active biological process regulated by specialized lipid mediators including the lipoxins and resolvins. Failure of resolution activity has a major negative impact on wound healing in chronic inflammatory diseases that is manifest as excess fibrosis and scarring. Lipoxins, including Lipoxin A{sub 4} (LXA{sub 4}), have known anti-fibrotic and anti-scarring properties. The goal of this study was to elucidate the impact of LXA{sub 4} on fibroblast function. Mouse fibroblasts (3T3 Mus musculus Swiss) were cultured for 72 h in the presence of TGF-β1, to induce fibroblast activation. The impact of exogenous TGF-β1 (1 ng/mL) on LXA{sub 4} receptor expression (ALX/FPR2) was determined by flow cytometry. Fibroblast proliferation was measured by bromodeoxyuridine (BrdU) labeling and migration in a “scratch” assay wound model. Expression of α-smooth muscle actin (α-SMA), and collagen types I and III were measured by Western blot. We observed that TGF-β1 up-regulates LXA{sub 4} receptor expression, enhances fibroblast proliferation, migration and scratch wound closure. α-SMA levels and Collagen type I and III deposition were also enhanced. LXA{sub 4} slowed fibroblast migration and scratch wound closure at early time points (24 h), but wound closure was equal to TGF-β1 alone at 48 and 72 h. LXA{sub 4} tended to slow fibroblast proliferation at both concentrations, but had no impact on α-SMA or collagen production by TGF-β1 stimulated fibroblasts. The generalizability of the actions of resolution molecules was examined in experiments repeated with resolvin D2 (RvD2) as the agonist. The activity of RvD2 mimicked the actions of LXA{sub 4} in all assays, through an as yet unidentified receptor. The results suggest that mediators of resolution of inflammation enhance wound healing and limit fibrosis in part by modulating fibroblast function. - Highlights: • TGF

  11. Garcinol对实验性口腔癌化学预防作用的研究%Chemopreventive effect of Garcinol on DMBA-induced oral precancerous lesion in hamsters

    Institute of Scientific and Technical Information of China (English)

    李芳; 孙正

    2011-01-01

    目的:探讨Garcinol对二甲基苯并蒽(7,12-dimethylbenz anthracene,DMBA)诱发的金黄地鼠口腔癌的化学预防作用.方法:30只金黄地鼠分3组:阴性对照组(6只)不涂药;阳性对照组(12只)涂0.5%DMBA于左侧颊囊,每周3次,共涂3周;Garcinol组(12只)前3周处理同阳性对照组,3周后换涂5 mmol/L Garcinol,每周3次,涂1周.第4周末实验结束处死所有地鼠,处死前2 h腹腔注射50 mg/kg的5-溴脱氧尿嘧啶(5-bromodeoxyuridine,BrdU).取左侧颊囊行组织病理学观察和BrdU免疫组化染色.结果:地鼠颊囊涂Garcinol 1周后,炎症细胞数/mm2由阳性对照组的158.65±26.51减少到55.03±22.80(P<0.01).单纯增生的病灶数由4.60±1.42减少到1.25±0.82(P<0.05).异常增生的病灶数由3.47±1.12减少到1.13±0.67(P<0.05).BrdU增殖指数由6.57±2.03减少到2.17±0.53(P<0.01).结论:Garcinol对DMBA诱发的金黄地鼠口腔癌前病变具有一定的化学预防作用,其机制可能与抑制炎症和细胞增殖有关.%Objective: To study the preventive effect of Garcinol on 7,12-dimethylbenz anthracene (DMBA) induced oral precancerous lesion in Golden Syrian hamsters. Methods: 30 hamsters were divided into three groups. 6 hamsters in health group were not treated, 24 were treated with 0.5% DMBA solution topically in the left cheek pouch three times per week for three consecutive weeks. After the last DMBA treatment ,the hamsters were divided into two groups at random. 12 animals in control group were not treated, 12 in treatment group received 5 mmol/L Garcinol three times within the following week. 4 weeks after the start of the experiment the animals were injected with 5-bromodeoxyuridine (BrdU) at 50 mg/kg and then sacrificed. The cheek pouch samples were collected for histopathology and BrdU immunohistochemisty. Results: Garcinol significantly decreased the number of inflammatory cells/mm2 in the lesion tissue from 158.65 ± 26. 51 to 52.25 ± 18.53 ( P < 0.01 ). The incidence of

  12. 三七总皂甙对缺氧缺血性脑损伤新生鼠内源性神经干细胞增殖分化的影响%Effect of panax notoginseng saponin on proliferation and differentiation of endogenous neural stem cells in neonatal rats with hypoxic-ischemia brain damage

    Institute of Scientific and Technical Information of China (English)

    雷勋明; 陈全景; 张晓芬; 陈少军

    2013-01-01

    Objective: To observe the effect of panax notoginseng saponin (PNS) on proliferation and differentiation of endogenous neural stem cells in neonatal rats with hypoxic - ischemia brain damage ( HIBD) . Methods: Seventy - two neonatal SD rats aged seven days old were randomly divided into Sham operation group, HIBD group, and PNS group, modified Rice - Vannucci method was used to establish HIBD models. The rats were treated with injection of PNS, 5 - bromodeoxyuridine ( BrdU) was used to label neural stem cells at pro-liferative state, immunohistochemical single staining and double - immunofluorescence technique were used to observe the effect of PNS on BrdU immunoreactivity in hippocampus of HIBD rats and BrdU/neuron specific enolase ( NSE) , BrdU/glial fibrillary acidic protein (GFAP) dual - labeling immunoreactivities, then the results were counted and analyzed. Results: Positive BrdU cells existed in hippocampus of HIBD rats; the numbers of positive BrdU cells and dual - labeling positive cells in hippocampus of HIBD rats treated with PNS increased significantly (P <0. 01 ) . Conclusion: PNS can induce the proliferation and differentiation of endogenous neural stem cells in HIBD rats, which indicates that it may have the ability of promoting neurogenesis.%目的:观察三七总皂甙对缺氧缺血性脑损伤(HIBD)新生鼠内源性神经干细胞增殖分化的影响,探讨其促进神经发生的作用.方法:将72只7日龄新生SD乳鼠随机分为假手术组、HIBD组及HIBD的三七总皂甙治疗组,用改良的Rice-Vannucci法制作HIBD模型.注射三七总皂甙干预治疗,用5-溴脱氧尿苷(BrdU)标记处于增殖状态的神经干细胞,免疫单标及双标免疫荧光技术观察三七总皂甙对HIBD海马区BrdU免疫活性及BrdU/NSE (Neuron specific enolase,NSE)、BrdU/GFAP(Glial fibrillary acidic protein,GFAP)双标免疫活性的影响,并计数分析.结果:HIBD的海马区存在BrdU阳性细胞分布;应用三七总皂甙的HIBD海

  13. Relations of proliferative activities of gastric carcinoma cells to lymphatic involvement, venous invasion and prognosis

    Institute of Scientific and Technical Information of China (English)

    吴云飞; 徐惠绵; 陈峻青

    2004-01-01

    Background This study was to evaluate bivariate bromodeoxyuridine(BrdUrd)/DNA flow cytometric analysis in detection of gastric carcinoma and to study the relations of cellular BrdUrd labeling indices (LI), G2/M-phase fraction(G2/MPF) and DNA ploidy pattern to lymphatic involvement, venous invasion and prognosis.Methods Fresh tumor samples from 60 patients with gastric carcinoma were analyzed by bivariate BrdUrd/DNA flow cytometry. The results were correlated with lymphatic vessel invasion, lymphatic node metastasis, the number of matastatic lymphatic nodes, and venous invasion. Propidium iodide (PI) was used as a fluorescent probe for total cellular DNA, and a monoclonal antibody against BrdUrd was used as a probe for BrdUrd incorporated into DNA. Fluorescent-labeled goat anti-mouse antibody was used as a second antibody. S-phase fractions were measured by in vitro BrdUrd labeling, and DNA ploidy and G2/MPF were also measured. Comparison of survival was performed with the log-rank test, the Chi-square test for qualitative data, and Student's t test for quantu data. Results BrdUrd LI and G2/MPF values were significantly higher in tumors with lymphatic vessel invasion than in those without invasion respectively (P<0.01); the patients who had tumors with lymphatic vessel invasion showed a significantly poor prognosis (P<0.01). Both BrdUrd LI and G2/MPF values were significantly higher in tumors with lymphatic node metastasis than in those without metastasis (P<0.01). A statistical significant difference was noted in the 5-year survival rates between the patients with lymph node metastasis and those without metastasis. Compared with diploid carcinoma, the incidence of lymph node metastasis was significantly higher in aneuploid carcinoma (P<0.05), and the patients with aneuploid carcinoma showed a significantly poor prognosis (P<0.05). BrdUrd LI was significantly higher in patients with more than 5 metastatic lymph nodes than those with 1-4 metastatic lymph nodes (P<0

  14. Cytotoxicity of dental composite (co)monomers and the amalgam component Hg{sup 2+} in human gingival fibroblasts

    Energy Technology Data Exchange (ETDEWEB)

    Reichl, Franz-Xaver; Simon, Sabine; Esters, Magalie; Seiss, Mario [Ludwig-Maximilians-University of Munich, Walther-Straub-Institute of Pharmacology and Toxicology, Munich (Germany); Kehe, Kai [Bundeswehr Institute of Pharmacology and Toxicology, Munich (Germany); Kleinsasser, Norbert [University of Regensburg, Department of Otolaryngology - Head and Neck Surgery, Regensburg (Germany); Hickel, Reinhard [Ludwig-Maximilians-University, Department of Operative Dentistry and Periodontology, Munich (Germany)

    2006-08-15

    Unpolymerized resin (co)monomers or mercury (Hg) can be released from restorative dental materials (e.g. composites and amalgam). They can diffuse into the tooth pulp or the gingiva. They can also reach the gingiva and organs by the circulating blood after the uptake from swallowed saliva. The cytotoxicity of dental composite components hydroxyethylmethacrylate (HEMA), triethyleneglycoldimethacrylate (TEGDMA), urethanedimethacrylate (UDMA), and bisglycidylmethacrylate (Bis-GMA) as well as the amalgam component Hg{sup 2+} (as HgCl{sub 2}) and methyl mercury chloride (MeHgCl) was investigated on human gingival fibroblasts (HGFs) at two time intervals. To test the cytotoxicity of substances, the bromodeoxyuridine (BrdU) assay and the lactate dehydrogenase (LDH) assay were used. The test substances were added in various concentrations and cells were incubated for 24 or 48 h. The EC{sub 50} values were obtained as half-maximum-effect concentrations from fitted curves. Following EC{sub 50} values were found [BrdU: mean (mmol/l); SEM in parentheses; n=12]: (24 h/48 h) HEMA 8.860 (0.440)/6.600(0.630), TEGDMA 1.810(0.130)/1.220(0.130), UDMA 0.120(0.010)/0.140(0.010), BisGMA 0.060(0.004)/0.040(0.002), HgCl{sub 2} 0.015(0.001)/0.050(0.006), and MeHgCl 0.004(0.001)/0.005(0.001). Following EC{sub 50} values were found [LDH: mean (mmol/l); SEM in parentheses; n=12]: (24 h/48 h) HEMA 9.490(0.300)/7.890(1.230), TEGDMA 2.300(0.470)/1.950(0.310), UDMA 0.200(0.007)/0.100(0.007), BisGMA 0.070(0.005)/0.100(0.002), and MeHgCl 0.014(0.006)/0.010(0.003). In both assays, the following range of increased toxicity was found for composite components (24 and 48 h): HEMA < TEGDMA < UDMA < BisGMA. In both assays, MeHgCl was the most toxic substance. In the BrdU assay, Hg{sup 2+} was about fourfold less toxic than MeHgCl but Hg{sup 2+} was about fourfold more toxic than BisGMA. In the BrdU test, a significantly (P<0.05) decreased toxicity was observed for Hg{sup 2+} at 48 h, compared to the 24 h

  15. Increased nuclear ploidy, not cell proliferation, is sustained in the peroxisome proliferator-treated rat liver.

    Science.gov (United States)

    Lalwani, N D; Dethloff, L A; Haskins, J R; Robertson, D G; de la Iglesia, F A

    1997-01-01

    Peroxisome proliferators are believed to induce liver tumors in rodents due to sustained increase in cell proliferation and oxidative stress resulting from the induction of peroxisomal enzymes. The objective of this study was to conduct a sequential analysis of the early changes in cell-cycle kinetics and the dynamics of rat liver DNA synthesis after treatment with a peroxisome proliferator. Immunofluorescent detection of proliferating cell nuclear antigen (PCNA) and bromodeoxyuridine (BrdU) incorporation into DNA during S phase we used to assess rat hepatocyte proliferation in vivo during dietary administration of Wy-14,643, a known peroxisome proliferator and hepatocarcinogen in rodents. Rats were placed on diet containing 0.1% WY-14,643 and implanted subcutaneously with 5-bromo-2'deoxyuridine containing osmotic pumps 4 days prior to being sacrificed on days 4, 11, and 25 of treatment. Isolated liver nuclei labeled with fluorscein isothiocyanate (FITC)-anti-BrdU/PI and FITC-anti-PCNA/PI were analyzed for S-phase kinetics using flow cytometry. Morphometric analysis was performed to evaluate nuclear and cell size and enumeration of BrdU labeled cells, binucleated hepatocytes, and mitotic index. The BrdU labeling index increased 2-fold in livers of Wy-14,643-treated rats at day 4, but distribution of cells in G1, S phase, and G2-M did not differ significantly from controls. PCNA-positive cells decreased from 36% on day 4 to 17% on day 25, whereas the percentage of PCNA-positive cells in controls increased 2-fold from day 4 to day 11 and remained unchanged up to day 25. The differences in the number of PCNA-positive nuclei between control and Wy-14,643-treated groups were statistically significant only on day 4. Binucleated hepatocytes, determined by morphometric analysis, increased slightly on day 25 in treated rats parallel to an increase in the percentage of cells in G2-M phase. Significant shifts were noted in nuclear diameter and nuclear area after 11 and 25

  16. Expression of neurogenic differentiation factor increased after transient hypoxia of hippocampal neurons in vitro%短暂性缺氧后海马神经元神经源性分化因子表达增高

    Institute of Scientific and Technical Information of China (English)

    刘晓艳; 徐剑文; 王玮

    2011-01-01

    目的 观察短暂性缺氧后神经源性分化因子(NeuroD)表达量的变化,探讨其在神经系统再生中的可能作用.方法 体外培养海马神经元,经神经元特异性烯醇化酶(NSE)免疫组织化学方法、尼氏体染色法鉴定.将培养5d的神经元置于三气培养箱(37℃、94%N2、5%CO2、1%O2)内缺氧培养.RT-PCR检测缺氧3h和6h后神经元NeuroD mRNA表达水平,电镜观察神经元形态学变化.将缺氧3h的神经元置于37℃、5%CO2培养箱中继续培养96h,固定前48h加入5-溴脱氧尿嘧啶核苷(BrdU)(终浓度为10μmol/L),免疫组织化学检测有无细胞增殖.结果 RT-PCR显示,缺氧3h后NeuroD表达量明显增高(P<0.01),而缺氧6h后NeuroD表达量与对照组相比差异无统计学意义(P>0.05).电镜结果显示,缺氧3h后细胞内细胞器未见明显变化,缺氧6h后细胞内出现空泡样变化,线粒体肿胀明显.免疫组织化学检测到BrdU阳性细胞.结论 短暂性缺氧后NeuroD表达量增高,可能参与了神经系统的再生过程.%Objective To observe the influence of transient hypoxia on the expression of neurogenic differentiation factor(NeuroD) in cultured neurons and investigate its possible roles in neural regeneration. Methods Influence of transient hypoxia on the expression of NeuroD was analyzed on the outcome of embryonic rat neurons in culture. Cultures at five days were exposed to hypoxia. After different periods(3 hours, 6 hours) of hypoxia, RT-PCR was performed to examine the mRNA levels of NeuroD. Electron microscopy was performed to observe neuronal alterations. Dishes after 3 hours hypoxia were then returned to normal atmosphere for ensuing culture 96 hours. Immunohistochemistry was performed to examine cell proliferation by incorporation of 5-bromodeoxyuridine ( BrdU ). Results Following hypoxia for 3 hours in cultured neurons, NeuroD increased distinctly and the incorporation of BrdU revealed an accumulation of proliferating cells.Compared with

  17. 自主运动可促进大鼠下丘脑神经祖细胞的增殖与分化%Voluntary exercise promotes proliferation and differentiation of adult rat hypothalamus progenitor cells

    Institute of Scientific and Technical Information of China (English)

    李光华; 松崎健太郎; 王银; 赵楠; 杨敏; 紫藤治

    2013-01-01

    Objective To investigate the effect of voluntary exercise on the proliferation and differentiation of hypothalamus progenitor cells in adult rats.Methods Male Wistar rats were divided into voluntary exercise (EX) and sedentary (SE) groups,both of which were further divided into 6 subgroups for observation on days 6,13,23,33,43 and 53.Bromodeoxyuridine (BrdU) was intraperitoneally injected daily for 5 consecutive days after commencing voluntary exercise,and at the specified time points during voluntary exercise,the rats' brains were removed to observe the numbers of BrdU-positive cells in the hypothalamus.Results Immunohistochemical analysis showed that the numbers of BrdU-positive cells in the hypothalamus of EX subgroups were significantly greater than those of SE subgroups on days 23,33,43 and 53.In EX group,the number of BrdU-positive cells double-stained for a mature neuron marker increased after 43 days of voluntary exercise,which did not occur in SE group.Conclusion Long-term voluntary exercise can promote the proliferation of neuronal progenitor cells in the hypothalamus and their differentiation into neurons.%目的 探讨自主运动对大鼠下丘脑神经细胞增殖与分化的影响.方法 雄性Wistar大鼠,随机分为对照组(SE)和自主运动组(EX),以上两组又进一步分为6、13、23、33、43、53 d共6个亚组.各组大鼠从实验开始,连续5d腹腔注射BrdU,于上述时间点处死大鼠并取脑组织观察下丘脑的BrdU阳性细胞数的变化.结果 免疫组化结果表明,EX组下丘脑的BrdU阳性细胞数在23、33、43、53 d亚组中明显高于SE组(P<0.05).EX组中经43 d的自主运动后,BrdU阳性细胞数与神经元双染色细胞数明显增加(P<0.05),对照组各亚组则无显著性变化.结论 自主运动可促进下丘脑的神经祖细胞增殖并分化为神经元,这可能与长期的运动锻炼有一定关系.

  18. Effects of mitomycin C on infiltration of polymorphonuclear leukocytes after epithelial scrape injury in the mouse cornea Efeito da mitomicina C na infiltração de leucócitos polimorfonucleares após lesão epitelial em córnea de camundongo

    Directory of Open Access Journals (Sweden)

    Ana Cecília Souza Leão Escarião

    2008-12-01

    Full Text Available PURPOSE: To determine whether mitomycin C (MMC alters appearance and disappearance of polymorphonuclear leucocytes (PMN in the cornea stroma, using an epithelial scrape injury in eye mouse model. METHODS: Twenty-mice underwent mechanical epithelium debridement in the central cornea using 20% ethanol. After the scrape, the right eye received 0.02% MMC for one minute, while the left eye received physiological saline. The animals were sacrificed on days 1, 2, 5, and 14 after surgery, and corneal whole mounts were prepared for histology. PMN distribution was analyzed in digitized microscope images. Cell division in the cornea was determined by immunohistochemical detection of bromodeoxyuridine (BrdU, which was injected intraperitoneally before the mice were sacrificed. RESULTS: Epithelial scrape injury triggered infiltration of PMNs into the corneal stroma. An analysis of PMN distribution revealed that there was no difference between eyes treated with and without MMC at all time points. BrdU labeling showed that 0.02% MMC for one minute blocked keratocyte proliferation completely. CONCLUSION: MMC treatment regimen, which is common in clinical practice, inhibits keratocyte proliferation during wound healing, but when used at 0.02% for one minute, it does not affect PMN infiltration into the corneal stroma, and subsequent movement toward the injury site, or the disappearance of PMNs from the stroma, in the mouse epithelial injury model.OBJETIVO: O objetivo do estudo foi determinar se a mitomicina C (MMC altera o aparecimento dos leucócitos polimorfonucleares (PMN no estroma corneano após abrasão epitelial central, utilizando olhos de camundongo como modelo. MÉTODOS: Vinte camundongos foram submetidos à abrasão epitelial em córnea central utilizando etanol a 20%. Após a lesão, o olho direito recebeu MMC a 0,02% por 1 minuto, enquanto o olho esquerdo recebeu solução salina. Os animais foram sacrificados em 1, 2, 5 e 14 dias após a cirurgia e

  19. Histopathologic characterization of the BTBR mouse model of autistic-like behavior reveals selective changes in neurodevelopmental proteins and adult hippocampal neurogenesis

    Directory of Open Access Journals (Sweden)

    Stephenson Diane T

    2011-05-01

    Full Text Available Abstract Background The inbred mouse strain BTBR T+ tf/J (BTBR exhibits behavioral deficits that mimic the core deficits of autism. Neuroanatomically, the BTBR strain is also characterized by a complete absence of the corpus callosum. The goal of this study was to identify novel molecular and cellular changes in the BTBR mouse, focusing on neuronal, synaptic, glial and plasticity markers in the limbic system as a model for identifying putative molecular and cellular substrates associated with autistic behaviors. Methods Forebrains of 8 to 10-week-old male BTBR and age-matched C57Bl/6J control mice were evaluated by immunohistochemistry using free-floating and paraffin embedded sections. Twenty antibodies directed against antigens specific to neurons, synapses and glia were used. Nissl, Timm and acetylcholinesterase (AchE stains were performed to assess cytoarchitecture, mossy fibers and cholinergic fiber density, respectively. In the hippocampus, quantitative stereological estimates for the mitotic marker bromodeoxyuridine (BrdU were performed to determine hippocampal progenitor proliferation, survival and differentiation, and brain-derived neurotrophic factor (BDNF mRNA was quantified by in situ hybridization. Quantitative image analysis was performed for NG2, doublecortin (DCX, NeuroD, GAD67 and Poly-Sialic Acid Neural Cell Adhesion Molecule (PSA-NCAM. Results In midline structures including the region of the absent corpus callosum of BTBR mice, the myelin markers 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNPase and myelin basic protein (MBP were reduced, and the oligodendrocyte precursor NG2 was increased. MBP and CNPase were expressed in small ectopic white matter bundles within the cingulate cortex. Microglia and astrocytes showed no evidence of gliosis, yet orientations of glial fibers were altered in specific white-matter areas. In the hippocampus, evidence of reduced neurogenesis included significant reductions in the number of

  20. Adenovirus-mediated hypoxia-inducible factor-1 alpha gene transfer induces angiogenesis and neurogenesis following cerebral ischemia in rats

    Institute of Scientific and Technical Information of China (English)

    Wanfu Wu; Xiu Chen; Zhen Yu; Changlin Hu; Wenqin Cai

    2008-01-01

    BACKGROUND: Hypoxia-inducible factor-1 (HIF-1) accumulates under conditions of hypoxia. HIF-1α target genes have pleiotropic effects on neurogenesis, neuroprotection and angiogenesis in the brain.OBJECTIVE: To investigate whether a recombinant adenovirus carrying HIF-1α can increase the expression of HIF-1α in vivo and thus promote angiogenesis and neurogenesis in a rat model of focal cerebral ischemia.DESIGN, TIME AND SETTING: The randomized, controlled experiment was performed at the Department of Neurobiology, Third Military Medical University of Chinese PLA from September 2006 to October 2007.MATERIALS: 68 healthy adult male Sprague-Dawley (SD) rats, weighing 230-250 g, were used. HIF-1α antibody was purchased from Wuhan Boster Company. Vascular endothelial growth factor (VEGF) antibody was purchased from Santa Cruz Biotech Company.METHODS: All 68 rats were induced with a transient middle cerebral artery occlusion (MCAO), according to the method of intra-luminal vascular occlusion. 54 rats, in which MCAO was successfully induced, were randomly divided into adenovirus (Ad) group and recombinant adenovirus with HIF-1αgene (Ad-HIF-1α) group (27 rats for each group). Rats were injected with 10 μL Ad (Ad group) or Ad-HIF-1α (Ad-HIF-1α group) into the lateral ventricle, 1 day after MCAO induction. MAIN OUTCOME MEASURES: Reverse transcription polymerase chain reaction was used to measure the expression of HIF-1α and of VEGF. Immunohistochemistry was used to detect the localization of HIF-1α, VEGF and factor Ⅷ in ischemic penumbra. Rat newborn nerve cells were labeled with 5-bromodeoxyuridine (BrdU) after ischemia. BrdU/neurofilament 200 (NF200) and BrdU/glial fibrillary acidic protein (GFAP) double labeled immunofluorescent histochemistry was used to identify the differentiation of newborn cells. Neurological function was evaluated using the modified neurological severity score (NSS).RESULTS: Compared with Ad, Ad-HIF-1αenhanced the expression of HIF-1

  1. Functional electrical stimulation increases neural stem/progenitor cell proliferation and neurogenesis in the subventricular zone of rats with stroke

    Institute of Scientific and Technical Information of China (English)

    LIU Hui-hua; XIANG Yun; YAN Tie-bin; TAN Zhi-mei; LI Sheng-huo; HE Xiao-kuo

    2013-01-01

    Background Functional electrical stimulation (FES) is known to promote the recovery of motor function in rats with ischemia and to upregulate the expression of growth factors which support brain neurogenesis.In this study,we investigated whether postischemic FES could improve functional outcomes and modulate neurogenesis in the subventricular zone (SVZ) after focal cerebral ischemia.Methods Adult male Sprague-Dawley rats with permanent middle cerebral artery occlusion (MCAO) were randomly assigned to the control group,the placebo stimulation group,and the FES group.The rats in each group were further assigned to one of four therapeutic periods (1,3,7,or 14 days).FES was delivered 48 hours after the MCAO procedure and divided into two 10-minute sessions on each day of treatment with a 10-minute rest between them.Two intraperitoneal injections of bromodeoxyuridine (BrdU) were given 4 hours apart every day beginning 48 hours after the MCAO.Neurogenesis was evaluated by immunofluorescence staining.Wnt-3 which is strongly implicated in the proliferation and differentiation of neural stem cells (NSCs) was investigated by Western blotting analysis.The data wera subjected to oneway analysis of variance (ANOVA),followed by a Tukey/Kramer or Dunnett post hoc test.Results FES significantly increased the number of BrdU-positive cells and BrdU/glial flbrillary acidic protein doublepositive neural progenitor cells in the SVZ on days 7 and 14 of the treatment (P <0.05).The number of BrdU/doublecortin (DCX) double-positive migrating neuroblast cells in the ipsilateral SVZ on day 14 of the FES treatment group ((522.77±33.32) cells/mm2) was significantly increased compared with the control group ((262.58±35.11) cells/mm2,P <0.05) and the placebo group ((266.17±47.98) cells/mm2,P <0.05).However,only a few BrdU/neuron-specific nuclear protein-positive cells were observed by day 14 of the treatment.At day 7,Wnt-3 was upregulated in the ipsilateral SVZs of the rats receiving

  2. 骨髓间充质干细胞移植对老年性痴呆大鼠空间学习记忆能力的影响%Effects of transplantation of bone marrow mesenchymal stem cells on spacial learning-dysmnesin of Alzheimer's disease in rats

    Institute of Scientific and Technical Information of China (English)

    王金华; 王世民; 孔繁明; 张文治; 唐帆; 张学斌; 苏心; 王新平

    2011-01-01

    Objective: To study the effects of transplantation of bone marrow mesenchymal stem cells (BMSCs) on learning and memory ability and its mechanism in rats with Alzheimer's disease induced by amyloid-β1-40 (Aβ1-40) injection.Method: AD model was induced by injecting Aβ1-40 into bilateral hippocampus. Three weeks later, the bone marrow mesenchymal stem cells was implanted. The learning and memory abilities of rats were evaluated with Morris water maze.Rats were sacrificed after 2 months. Bromodeoxyuridine(BrdU)+neuron specific enolase(NSE), BrdU+glial fibrillary acidic protein (GFAP) immunohistochemistry double-staining cells, and the migration of doublecortin (DCX, the neuron precursors marker) from subventricular zone to the damaged hippocampus were observed.Result:The escape latency of hidden platform in AD group delayed significantly(P<0.05),the escape latency in transplantation treatment group decreased obviously as compared with model group(P<0.05). The immunohistochemistry double-staining cells could be found at the center of damaged site(bilateral hippocampus) and the surrounding sites in rats of transplantation group, the migration of doublecortin from subventricular zone to the damaged hippocampus wasn't observed.Conclusion:The implantation of BMSCs maybe have the effect of improving spacial learning-dysmnesia of AD rats.%目的:研究骨髓间充质干细胞(BMSCs)移植对淀粉样蛋白-β(1-40)(Aβ(1-40))诱导的老年性痴呆(Alzheimer's disease,AD)模型大鼠行为学的影响,并探讨其治疗AD的可能机制.方法:采用向大鼠双侧海马立体定向注射Aβ(1-40)诱导AD动物模型,造模后3周采用同样方法移植骨髓间充质干细胞,采用Morris水迷宫观察大鼠行为学变化.造模后2个月处死大鼠,观察海马组织有无溴脱氧尿嘧啶核苷(Brdu)+神经元特异性烯醇化酶(NSE)、BrdU+胶质纤维酸性蛋白(GFAP)免疫组织化学双染阳性细胞,并且观察从侧脑室到海马是否存在神

  3. Influence of Liver regeneration after partial hepatectomy on the development of liver metastasis of colon cancer in rats%肝切除术后肝再生对大鼠结肠癌肝转移灶生长的影响

    Institute of Scientific and Technical Information of China (English)

    徐波; 蔡文松; 肖焕擎; 李书华; 夏金堂; 朱光辉; 翁杰锋

    2009-01-01

    目的 探讨肝再牛进程触发大鼠结肠痛肝转移残肝内隐性转移灶进展的发生机制.方法 采用肝包膜下种植建立结肠癌肝转移大鼠模型,随机分为假手术组、37%肝切除组和70%肝切除组;采用腹膜后注射建市结肠癌腹膜后转移模型,随机分为假手术组和70%肝切除组.手术后3周处死动物,测定肝内转移瘤量、再生肝重及腹膜后瘤结节重.在含有肝切除后24 h和14 d的门静脉血清培养基中进行结肠癌细胞Lovo体外培养,5.溴脱氧尿核苷(5-BrdU)DNA掺入法检测细胞增殖反应.结果 手术切除明显促进70%肝切除组肝内残留癌牛长(P0.05);肝切后24 h门静脉血清组5-BrdU DNA掺人率从第72小时开始增加,至第120小时呈持续增加趋势(P0.05).结论 结肠癌肝转移切除术后可诱发肝内微小残留灶的进展,并不通过血液循环全身性释放,对肝外转移瘤并不发挥作用.肝切除范围与诱发肿瘤生长有关,只有肝切除达到一定程度时,才足以刺激肿瘤生长.%Objective To investigate the stimulated effect of liver regeneration on colon cancer cells in remnant liver in rats. Methods Rat models with liver metastases or retro-peritoneal metastases of colon cancer were established: animals underwent 37% or 70% liver resection and were compared with a sham laparotomy( 15, 25, 15 cases, respectively). Metastases were performed two weeks before resection. Rats were killed 3 weeks after the resection. Total body weight, liver and tumor weights were recorded. The human colon adenocarcinoma cell line Lovo was cultured in the presence of portal serum withdrawn 24 hours and 14 days after partial hepatectomy(PH). DNA synthesis was assessed by flow cytometry analysis for 5-Bromodeoxyuridine (5-BrdU) incorporation. Results The tumor growth was accelerated in the remnant liver in 70% PH group, but the tumors in 37% PH group and retro-peritoneal site were not influenced by PH. Compared with the control group

  4. Pharmacological studies of the mechanism and function of interleukin-1β-induced miRNA-146a expression in primary human airway smooth muscle

    Directory of Open Access Journals (Sweden)

    Jiang Xiaoying

    2010-06-01

    Full Text Available Abstract Background Despite the widespread induction of miR-146a during the innate immune response little is known regarding its biogenesis, function and mechanism. We have therefore examined the role of miR-146a during the interleukin (IL-1β-stimulated IL-6 and IL-8 release and proliferation in primary human airway smooth muscle (HASM cells. Methods HASM cells were isolated from human lung re-section, cultured to a maximum of 3 - 6 passages and then exposed to IL-1β. miR-146a expression were determined by qRT-PCR, IL-6 and IL-8 release by ELISA and proliferation using bromodeoxyuridine incorporation. The role of NF-κB and the MAP kinase pathways was assessed using pharmacological inhibitors of IKK2 (TPCA-1, JNK (SP600125, p38 MAP kinase (SB203580 and MEK-1/2 (PD98059. miR-146a function was determined following transfection of HASM with inhibitors and mimics using Amaxa electroporation. Results IL-1β induced a time-dependent and prolonged 100-fold induction in miR-146a expression, which correlated with release of IL-6 and IL-8. Exposure to IL-1β had no effect upon HASM proliferation. Pharmacological studies showed that expression of primary miR-146a was regulated at the transcriptional levels by NF-κB whilst post-transcriptional processing to mature miR-146a was regulated by MEK-1/2 and JNK-1/2. Functional studies indicated that IL-1β-induced miR-146a expression does not negatively regulate IL-6 and IL-8 release or basal proliferation. However, inhibition of IL-1β-induced IL-6 and IL-8 release was observed at the super-maximal intracellular miR-146a levels obtained by transfection with miR-146a mimics and indicates that studies using miRNA mimics can produce false positive results. Mechanistic studies showed that in the presence of super-maximal levels, the action of miR-146a mimics was mediated at a step following IL-6 and IL-8 mRNA transcription and not through down-regulation of IL-1 receptor associated kinase 1 (IRAK-1 and TNF

  5. 人胚胎纹状体来源神经干细胞的体外培养**★%In vitro culture of human embryonic striatum-derived neural stem cells**★

    Institute of Scientific and Technical Information of China (English)

    樊明超; 王巧玲; 刘克; 张欣; 关云谦; 孙鹏

    2013-01-01

    BACKGROUND: Neural stem cells are always derived from animals, and unsuitable for human transplantation treatment. OBJECTIVE: To explore the in vitro culture methods of human embryonic striatum-derived neural stem cells, and to observe the biological characteristics. METHODS: The human embryonic striatum were separated from the embryo at a gestational age of 8-16 weeks that received induction of labor with water bag, and then the embryonic striatum was in vitro cultured in the serum-free Dulbecco’s modified Eagle’s medium. The cells were passaged after neurospheres formation, and then the cells were induced to differentiation with the Dulbecco’s modified Eagle’s medium/F12 containing 10% fetal bovine serum. RESULTS AND CONCLUSION: The in vitro cultured human embryonic striatum-derived neural stem cells grew rapidly and could express nestin. Colony formation assay showed the cel clone formation rate was 6.0%-7.0%. 5-Bromodeoxyuridine incorporation assay showed the cel proliferation rate was 37.9%. Immunofluorescence staining showed that the cells after induction and differentiation could express Tuj-1, glial fibril ary acidic protein and nestin, but not express myelin basic protein. The results indicate that human embryonic striatum-derived neural stem cells cultured in the serum-free medium can maintain their biological characteristics and have self-renewal capacity, and the cells can differentiate into the neurons and astrocytes induced by the fetal bovine serum.%  背景:目前神经干细胞多由动物获得,不适合人类临床移植治疗。目的:探索体外环境下人胚胎纹状体来源神经干细胞的培养方法,同时观察其生物学特性。方法:取经水囊引产的孕8-16周人胚胎纹状体,体外用无血清 DMEM 培养基进行培养,待细胞形成神经球后进行传代,并应用含体积分数10%胎牛血清的 DMEM/F12培养液进行诱导分化。结果与结论:体外培养的人胚胎纹状体来

  6. Histogenesis of olfactory bulb and rostral migration stream in mice%小鼠嗅球以及吻侧迁移流的发生

    Institute of Scientific and Technical Information of China (English)

    高文静; 王志新; 徐高磊; 邓锦波; 高晓群

    2012-01-01

    目的:探讨嗅球结构和吻侧迁移流(RMS)的发生及其中神经干细胞的变化趋势.方法:利用H-E染色、Nissl染色标记嗅球形态结构,BrdU免疫荧光技术观察吻侧迁移流中增殖的神经干细胞.结果:嗅球组织结构的发生:胚胎期,嗅球各层的结构轮廓尚未发育完全;生后3d时,各层结构虽然发育完善,但层与层之间的交界处模糊不清,生后5d时,整个嗅球结构发育已经完善,也就意味着嗅觉系统发育成熟.迁移流的发生:胚胎初期,侧脑室是一个很大的空腔,管腔膜上布满了增殖的神经于细胞,脑室下区延伸入中空的嗅球中,之后管腔闭合,形成了原始的吻侧迁移流;出生时,吻侧迁移流中的细胞密度达到最大值,之后逐渐降低,直至消失.结论:嗅球片层化结构是从无到有,从不成熟到成熟的过程.吻侧迁移流的发生是侧脑室腔的闭合和室管下层上神经干细胞遗留的痕迹.%Objective:To discuss the structure of the olfactory bulb (OB), the occurrence of the rostral migration streams (RMS) and the change trend of neural stem cells in RMS. Methods: The histological structure of the OB was marked by the methods of HE staining and Nissl staining. Using bromodeoxyuridine (BrdU)-immunofluorescence to observe the proliferation of neural stem cells in RMS. Results: (1)In the embryonic period, the outline of the structure of the OB layers was not fully developed yet. On the third day after birth the structure developed well, but the junctions between layers were blurred. In P5, the development of the entire olfactory bulb was improved. (2)In the early embryo, the lateral ventricle was a large cavity. The lumen membrance was full of the proliferation of neural stem cells. The subventricular zone extended into the hollow of OB, and then closed the lumen, forming the original rostral migration stream. In P0, the cell density in RMS reached its maximum value, then gradually reduced until it

  7. Effect of lycopene on androgen receptor and prostate-specific antigen velocity

    Institute of Scientific and Technical Information of China (English)

    ZHANG Xin; WANG Qi; Barber Neil; CHEN Xiao

    2010-01-01

    Background There is increasing interest in the role of dietary factors in both the development and behaviour of prostate cancer.This study was carried out to evaluate the impact of the dietary factor lycopene on DNA synthesis,activity and expression of the androgen receptor gene element in prostate LnCaP cells and to report our pilot phase Ⅱ study investigating its effect on prostate-specific antigen velocity over one year.Methods LnCaP cells were grown with or without different concentrations of lycopene or tetrahydrofuran (THF solvent)added to the culture medium for 48 hours.DNA synthesis was measured by the incorporation of bromodeoxyuridine (Brdu) into DNA during a 4-hour pulse, followed by immunostaining and visualization of stained cells using fluorescence microscopy.A transient transfection of a plasmid DNA recombinant containing an androgen receptor element-luciferase (ARE-Luc) report gene into LnCaP cells was developed and the impact of different concentrations of lycopene on the androgen receptor element was reflected by quantitative analysis of the luciferase enzyme function.Expression of the androgen gene was also studied by Western blotting.The phase Ⅱ pilot study patients (n=41) previously diagnosed with prostate cancer were enrolled and given lycopene supplement, 10 mg per day, and response was measured by observing changes in the plasma prostate-specific antigen (PSA) levels.Results The addition of 0.5 μmol/L, 5 μmol/L, 10 μmol/L and 15 μmol/L of lycopene was shown to inhibit cell growth by 2.66%, 4.29%, 3.73% and 13.66%, respectively, compared with the THF solvent control samples (P=0.015).As compared with the RPMI1640 medium group, cell proliferation in the presence of 5 μmol/L, 10 μmol/L, and 15 μmol/L lycopene was inhibited by 8.12%, 6.33% and 12.00%, respectively (P=0.024).We showed for the first time that lycopene inhibited the activity of the androgen receptor gene element in a dose-related manner.Inhibition was seen in the

  8. Effect of fish oil enriched enteral diet on inflammatory bowel disease tissues in organ culture: Differential effects on ulcerative colitis and Crohn's disease

    Institute of Scientific and Technical Information of China (English)

    Doris Meister; Subrata Ghosh

    2005-01-01

    AIM: To investigate the influence of fish oil enriched enteral diet on intestinal tissues taken from Crohn's disease (CD), ulcerative colitis (UC) and non-inflamed non-IBD control patients in vitro.METHODS: Colonoscopic biopsies from patients with active CD (n = 4), active UC (n = 7), and non-inflamed non-IBD control patients (n = 4) were incubated (three dilutions of 1:20, 1:10, and 1:5) with Waymouth's culture medium and enteral elemental diet (EO28, SHS, Liverpool, UK) modified in the fatty acid composition with fish oil (EF) in an organ culture system for 24 h. In each experimental set-up, incubation with Waymouth's medium alone as control was included. Tissue viability was assessed by adding bromodeoxyuridine (BrdU) to the culture fluid and immunohistochemically staining for BrdU uptake. Cytokine ratio of IL-1ra/IL-1β (low ratio indicative of inflammation) and production of those cytokines as a percentage of medium control were assayed in the culture supernatant. RESULTS: Incubation of CD-affected tissue with EF (1:20, 1:10, and 1:5) modestly and non-significantly increased IL-1ra/IL-1β ratio as compared with medium control (CD 39.1±16.1; 26.5±7.8, 47.1±16.8 vs control 13.0±2.2), but incubation of UC-affected tissues increased IL-1ra/IL-1β ratio significantly in all three dilutions (UC 69.1±32.2, P<0.05; 76.1±36.4, P = 0.05;84.5±37.3, P<0.02; vs control 10.2±3.7). Incubation of non-inflamed non-IBD control tissue did not increase the IL-1ra/IL-1β ratio in any dilution compared to medium control (69.3±47.0, 54.1±30.6, 79.4±34.0 vs control 76.1±37.3). Average percentage production of IL-1β indexed against medium control was significantly less in UC after EF incubation as compared with CD (UC 24.0±4.8 vs CD 51.8±8.1; P<0.05). Average percentage production of IL-1ra was markedly higher in UC (135.9±3.4) than that in control patients (36.5±4.3) (P<0.0001).CONCLUSION: IBD tissues, after incubation with elemental diet modified in its

  9. DESARROLLO DE UN POXVIRUS RECOMBINANTE QUE EXPRESA LA GLICOPROTEÍNA D DEL HERPESVIRUS BOVINO-1 Development of a Recombinant Poxvirus Expressing Bovine Herpesvirus-1 Glycoprotein D

    Directory of Open Access Journals (Sweden)

    JULIÁN RUIZ SÁENZ

    2012-12-01

    generate a recombinant poxvirus (Raccoonpox [RCN] expressing a truncated version of BHV-1 gD to be used as a vaccine. To do this, it was amplified the gene for a truncated version of gD which subsequently was cloned in transfer plasmid PTK/IRES/tpa which has homology to sites of poxvirus thymidine kinase, an internal site of ribosome entry (IRES and a secretory signal (tPA, generating the construct PTK/gD/IRES/tpa. To generate the recombinant RCN, we took BSC-1 cells and we infected with a wild type RCN (CDC/V71-I-85A at a multiplicity of infection of 0.05, then cells were transfected with the construct PTK/gD/IRES/tpa, generating different viral populations with and without the gene of interest. To select recombinant viruses expressing the gene of interest, we performed a selection of recombinant thymidine kinase negative and positive for gD by three rounds of plaque purification on RAT-2 cells monolayers which are thymidine kinase null and using bromodeoxyuridine. Recombinant viruses were recovered and confirmed by PCR and nucleotide sequencing and so called RCN-gD.

  10. Predisposition to cancer and radiosensitivity

    Directory of Open Access Journals (Sweden)

    P. Pichierri

    2000-12-01

    Full Text Available Many cancer-prone diseases have been shown to be radiosensitive. The radiosensitivity has been attributed to pitfalls in the mechanisms of repair of induced DNA lesions or to an impaired cell cycle checkpoint response. Although discrepancies exist in the results obtained by various authors on the radiosensitivity of individuals affected by the same disease, these can be attributed to the large variability observed already in the response to radiation of normal individuals. To date three test are commonly used to assess radiosensitivity in human cells: survival, micronucleous and G2 chromosomal assay. The three tests may be performed using either fibroblasts or peripheral blood lymphocytes and all the three tests share large interindividual variability. In this regard a new approach to the G2 chromosomal assay which takes into account the eventual differences in cell cycle progression among individuals has been developed. This new approach is based on the analysis of G2 homogeneous cell populations. Cells irradiated are immediately challenged with medium containing bromodeoxyuridine (BrdUrd. Then cells are sampled at different post-irradiation times and BrdUrd incorporation detected on metaphases spread and the scoring is done only at time points showing similar incidence of labelled cells among the different donors. Using this approach it has been possible to reduce the interindividual variability of the G2 chromosomal assay.Muitas doenças que predispõem ao câncer têm se mostrado radiossensíveis. A radiossensibilidade tem sido atribuída a problemas nos mecanismos de reparo de lesões de DNA induzidas ou a uma resposta alterada no "checkpoint" do ciclo celular. Embora existam discrepâncias entre os resultados obtidos por vários autores quanto à radiossensibilidade de indivíduos afetados pela mesma doença, essas discrepâncias podem ser atribuídas à grande variabilidade observada já na resposta de indivíduos normais à radia

  11. Histochemical, Biochemical and Cell Biological aspects of tail regeneration in lizard, an amniote model for studies on tissue regeneration.

    Science.gov (United States)

    Alibardi, Lorenzo

    2014-01-01

    and inflammatory course, an inspiring model for understanding failure of tissue regeneration in higher vertebrates and humans. The participation of 5-Bromo-deoxyuridine (5BrdU) long retention cells, indicated as putative stem cells, for the following regeneration is analyzed and it shows that different tissue sites of the original tail contain putative stem cells that are likely activated from the wounding signal. In particular, the permanence of stem cells in the central canal of the spinal cord can explain the limited but important neurogenesis present in the caudal but also in the lumbar-thoracic spinal cord. In the latter, the limited number of glial and neurons regenerated is however sufficient to recover some limited hind limb movement after injury or spinal transection. Finally, the presence of stem cells in the spinal cord, in the regenerative blastema and skin allow to use these organs as a source of cells for studies on gene activation during cell differentiation in the new spinal cord, tail and in the epidermis. The above information form the basic knowledge for the future molecular studies on the specific gene activation capable to determine tail regeneration in lizards, and more in general genes involved in the reactivation of regeneration process in amniotes and humans.

  12. The mechanism of growth enhancement of P2X7 receptor on primary cultured rat cortical astrocyte%P2X7受体在原代培养星形胶质细胞生长中的作用

    Institute of Scientific and Technical Information of China (English)

    刘颖; 梁华征; 孙景军; 叶诸榕

    2007-01-01

    目的 探讨ATP是否促进原代培养的星形胶质细胞(astrocytes,As)发生类似反应性星形胶质化的变化以及嘌呤类受体P2X7在该过程中的作用.方法 原代As的分离和培养;实时照相观察As形态变化;用BrdU掺入法及流式细胞观察As增殖变化;用荧光标记实时定量PCR(real-time RT-PCR)检测GFAP mRNA,P2X7 mRNA,TGF-β1 mRNA表达的变化;用Western blot检测GFAP 表达; ELISA检测培养上清中TGF-β1的变化.结果 成功分离并培养原代As,免疫荧光鉴定阳性率为99%.不同浓度ATP(50 μmol/L,100 μmol/L,500 μmol/L)作用于As,均可使之表现出类似反应性胶质化的形态改变,表现为胞浆丰富,细胞突起增加且更为明显.ATP 100 μmol/L作用1 d后,As 的S期细胞数目明显增加,提示细胞增殖的活跃,5-溴脱氧尿嘧啶核苷(5-bromodeoxyuridine,5-BrdU)掺入法显示细胞核阳性率明显增加.500 μmol/L 浓度的ATP能促进As的 GFAP mRNA,P2X7 mRNA表达.用P2X7特异性的受体激动剂2′-3′-O-(4-benzoylbenzoyl)-adenosine-5′-triphosphate (BzATP) 50 μmol/L,75 μmol/L,100 μmol/L作用于原代培养的As,在培养基有Ca2+情况下可明显促进GFAP表达.在培养基有Ca2+的情况下BzATP作用2 h及12 h时As中TGF-β1 mRNA升高.培养上清中TGF-β1蛋白的含量在8 h 及48 h 均有升高.TGF-β1中和抗体能部分抑制P2X7引起的As GFAP含量的增加.结论 100 μmol/L的ATP可以促进As增殖.各种浓度ATP均可促进As形态产生类似胶质化反应的变化.P2X7特异性受体激动剂BzATP可引发胶质化样反应,并且在有Ca2+的情况下促进TGF-β1的转录和释放.TGF-β1参与了P2X7受体诱导的类似反应性星形胶质化过程.

  13. Distribution, morphology and origins of nitric oxide synthase-expressing neurons in the brain of adult mouse%小鼠脑内不同脑区中一氧化氮合酶免疫阳性神经元的分布、形态特征和起源

    Institute of Scientific and Technical Information of China (English)

    黄增金; 刘芳

    2012-01-01

    Objective:To investigate the distribution, morphology and origins of nNOS-expressing neurons in the brain of a-dult mice. Methods-. By using immunohistochemistry methods, we explored the distribution and morphology of nNOS-expressing neurons; BrdU (5-bromodeoxyuridine) birth-dating methods were used to examine when the nNOS-expressing neurons were genesis; and the origin of nNOS-expressing neurons was traced in Nkx2. 1 and Shh lineage by Cre-Loxp recombination. Results: nNOS-expressing neurons widely distributed in the brain of adult mouse, especially in the neocortex, stria-tum and septum/diagonal band (DB) ; nNOS-expressing neurons located in the neocortex and striatum were greatly produced between E13. 5 and E14. 5, and nNOS-expressing neurons in the septum/DB production peaks around Ell. 5 and E12. 5. The majority of nNOS-expressing neurons were derived from Nkx2. 1 and Shh (Sonic hedgehog) lineages. Conclusion: the nNOS-expressing neurons are widely distributed in the brain of adult mice. The nNOS-expressing neurons located in different brain regions are produced during different embryonic stages. The majority of nNOS-expressing neurons are derived from Nkx2. 1 lineages and a small part are from Shh lineages.%目的:研究小鼠前脑一氧化氮合酶(nNOS)免疫阳性(nNOS阳性)神经元在成年小鼠大脑的分布、形态特征和起源.方法:免疫组织化学显色观察nNOS阳性神经元在成年小鼠大脑中分布及其形态特征;BrdU标记新生神经元,研究脑内nNOS阳性神经元产生的时间;通过Nkx2.1 (NK2 homeobox 1)-Cre和Shh (Sonic hedgehog)-Cre转基因小鼠与基因报告小鼠杂交后追踪其子代细胞的方法,观察成年小鼠脑内nNOS阳性神经元的起源.结果:nNOS阳性神经元在小鼠大脑中广泛表达;BrdU实验结果表明,皮质和纹状体中nNOS阳性神经元主要在胚胎期13.5d到14.5d产生,而隔区/钭角带中的这部分神经元则主要在胚胎期11.5d到12.5d产生;大部分

  14. Glucocorticoid effects on adult hippocampal neural progenitor cells%糖皮质激素对成体海马神经祖细胞的影响****☆◆

    Institute of Scientific and Technical Information of China (English)

    于秀军; 李奕; 台立稳; 陈相

    2013-01-01

    cel s was identified by 5'-bromodeoxyuridine incorporation method. RESULTS AND CONCLUSION:Dexamethasone with the concentrations of 1, 10 and 100μmol could decrease the number of the neuron-glia antigen 2 proteoglycan-positive neural progenitor cel s, increase the number of terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end labeling positive cel s, and significantly reduce the number of BrdU positive cel s. High concentration of glucocorticoid can decrease the number of the neuron-glia antigen 2 proteoglycan-positive neural progenitor cel s by inhibiting the proliferation and inducing the apoptosis.

  15. 过表达Syndecan-4促进人脐静脉内皮细胞增殖%Syndecan-4 Overexpression Enhances Human Umbilical Vein Endothelial Cells Proliferation

    Institute of Scientific and Technical Information of China (English)

    宗斌; 谢峻; 徐标

    2011-01-01

    Aim The proliferation of endothelial cells plays an important role in angiogenesis. In present study,we observed the effect of syndecan-4 on human umbilical vein endothelial cells (HUVECs) proliferation as well as its possible mechanism. Methods HUVECs were isolated and cultured. The cells were infected with Ad-syndecan-4 or Adnull as control. Immunostaining was performed to investigate syndecan-4 expression and clusterization. Western blotting was used to assess phosphorylation of downstream kinase Akt and endothelial nitric oxide synthase (eNOS). Proliferation ability of HUVECs was assessed by p-H3, bromodeoxyuridine (5-BrdU) and 5-ethynyl-2'-deoxyuridine (EdU). Results Compared with the Ad-null group, increased cell proliferation rate was observed in the Ad-syndecan-4 group. Syndecan-4 overexpression induced the clusterization of syndecan-4 themselves. The levels of Akt and eNOS phosphorylation were also increased in HUVECs with syndecan-4 overexpression. Conclusion Overexpressed syndecan-4 induced the self-clusterization of syndecan-4 and the activation of downstream Akt and eNOS, which may contribute to increased proliferation of HUVECs.%目的 内皮细胞增殖在血管新生中起着非常重要的作用.本研究拟观察过表达Syndecan-4对人脐静脉内皮细胞的促增殖作用并对其相关机制进行探讨.方法 分离和培养人脐静脉内皮细胞,分别将过表达Syndecan-4的腺病毒、空病毒转染至人脐静脉内皮细胞,用免疫染色法观察人脐静脉内皮细胞的Syndecan-4的表达水平和自聚现象,用Western blotting方法检测人脐静脉内皮细胞内Akt、内皮细胞氮氧化物合酶蛋白磷酸化的水平;用磷酸化组蛋白3、5-溴脱氧尿嘧啶核苷、5-乙炔基-2′脱氧尿嘧啶核苷法观察人脐静脉内皮细胞的增殖情况.结果 与对照组相比,转染Syndecan-4组的人脐静脉内皮细胞增殖明显活跃,Syndecan-4表达明显增加,且存在自聚现象;Western blotting检测

  16. Covalent binding of growth factor collagen patch on human bone marrow mesenchymal stem cell proliferation and differentiation%共价结合生长因子胶原补片对人骨髓间充质干细胞增殖和分化的影响

    Institute of Scientific and Technical Information of China (English)

    卢耀军; 赵瑞平; 孙凯; 乌日娜; 韩瑞娟

    2016-01-01

    ObjectiveTo prepare the basic fibroblast growth factor (bFGF) and vascular endothelial growth factor (VEGF) collagen covalently bonded patch, and discusse the effects of human bone marrow mesenchymal stem cell proliferation and differentiation.MethodCollagen patch was prepared and were randomly divided into control group and experimental group. Control group collagen patch treated by carbodiimide under sterile conditions. Experimental group collagen patch at room temperature under the condition of used N-hydroxy succinimide and+phosphate buffered saline+EDC.HCL and with bFGF and VEGF of covalent binding. Saved after 1, 3, 7, 14, 21, 28 days, the concent of bFGF and VEGF in the supernatant lfuid were detected by ELISA. The human bone marrow mesenchymal stem homogeneous cell were seeded on two groups of collagen patch, cell counts and MTT assay and bromodeoxyuridine monoclonal antibody proliferation assay were performed, and the SMA immunolfuorescence staining method was used to detect cell differentiation, the expression of collagenⅠ and collagen Ⅲ were detected by RT-PCR.Result Experimental group collagen patch with VEGF and bFGF binding were signiifcantly higher than control group (P<0.05). Draw the release curve and analysis found that the experimental group growth factor in a very stable state, only a handful of dissociated release. 28 days after preparation, most growth factor remained in the collagen patch. Two groups of collagen patch with the passage of time, bone marrow mesenchymal stem cells showed a growth trend. 3 and 7 days after inoculation comparison showed that experimental group collagen patch on carbodiimide were signiifcantly more than control group (P<0.05). Compared with control group, experimental group of collagen supplement cell sheet on the expression levels of collagenⅠ and collagenⅢwere signiifcantly reduced by RT-PCR detection and SMA staining found (P<0.05).ConclusionbFGF and VEGF covalent binding of collagen patch has a greater

  17. Antidepressant-like Effect of Cell-free Filtrate of Sodium Ferulate-induced and Differentioned PC12 Cell Lysates%阿魏酸钠诱导分化的PC12细胞裂解液的无细胞滤液的抗抑郁样效果

    Institute of Scientific and Technical Information of China (English)

    廖铭能; 于立坚; 张永平; 马润娣; 张霄瑜; 于廷曦

    2011-01-01

    .PC12 cells were cultured in DMEM containing 80 μmol/L SF for 6 days, and then cell-free SFIDPC12CL was prepared.Residual SF concentration in cell-free SFIDPC12CL was assayed by HPLC.Depressionlike rat models were reproduced by CMS stimuli.Antidepressant effects of SFIDPC 12CL were assessed by behavioural tests.The effects of SFIDPC12CL on hippocampal and cerebral cortex expressions of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) were assayed by immunohistochemistry, and the effect of SFIDPC 12CL on hippocampal neurogenesis assayed using the thymidine analog bromodeoxyuridine (BrdU) as a marker for dividing cells in CMS-induced depression-like model rats.Our studies demonstrate that administration of SFIDPC 12CL significantly attenuated the CMS-induced depression-like behavioural disorders, up-regulated the hippocampal and cerebral cortex expressions of NGF and BDNF, and increased the hippocampal number of BrdUlabeled cells.These findings indicate that SFIDPC 12CL shows marked antidepressant-like effects in the CMS-induced depression-like model rats, and raise the possibility that SFIDPC12CL up-regulates expressions of NGF and BDNF, and increases neuronal number.

  18. rhG-CSF促进体外培养神经干细胞的增殖%rhG-CSF promoting the proliferation of neural stem cells in vitro

    Institute of Scientific and Technical Information of China (English)

    李延兰; 贾德永; 付洁; 刘慧娟

    2011-01-01

    Objective To investigate whether granulocyte colony-stimulating factor ( G-CSF ) has a direct effect on the proliferation of mouse neural stem cells in vitro. Methods Primary mouse neural stem cells( NSCs ) were isolated from Kunming mice and cultured in serum free medium. The third passage NSCs were used in the experiments. NSCs were treated with G-CSF ( 10, 30, 60 , 100 , and 200μg/L ). The proliferation of NSCs was detected by MTT colorimetric assay and bromodeoxyuridine ( BrdU ) incorporation assay. The expressions of STAT3 and p-STAT3 were examined by Western blotting. Results There was the expression of G-CSF receptor on the neural stem cells. G-CSF obviously improved the viabilities of NSCs in a dose-dependent manner. Furthermore, 100μg/L G-CSF yielded the optimal effect. The BrdU-positive cells against total NSCs treated with G-CSF were markedly enhanced. Time course experiments demonstrated that STAT3 phosphorylation by G-CSF was evident after 5 minutes, reaching the maximum after 30 minutes. At 75 minutes, the effect on STAT3 returned to the basal value. Pretreatment with the G-CSF receptor antibody significantly reduced the phosphorylation of STAT3 induced by G-CSF. BrdU incorporation showed that cell proliferation in the presence of G-CSF and neutralizing antibody for G-CSF receptor was similar to that of the reduced growth medium group. Conclusion G-CSF may stimulate the proliferation of NSCs in vitro. Our results provide the cellular basis of the role of G-CSF in NSCs in vitro ,which may serve as a useful reference for future studies of the powerful neuroprotective effect of G-CSF in various types of neurological disorders.%目的 探讨重组人粒细胞集落刺激因子(rhG-CSF)对小鼠胚胎神经干细胞(NSCs)增殖的作用.方法 分离培养小鼠NSCs,通过向培养基中添加G-CSF(10、30、60、100和200μg/L),四甲基偶氮唑蓝(MTT)比色法以及5-溴-2′-脱氧尿苷(BrdU) 免疫荧光染色标记检测NSCs的增殖.免疫印

  19. [Effects of local transplantation of autologous adipose-derived mesenchymal stem cells on the formation of hyperplastic scar on rabbit ears].

    Science.gov (United States)

    Chen, L; Wang, D L; Wei, Z R; Wang, B; Qi, J P; Sun, G F

    2016-10-20

    Objective: To investigate the effects of local transplantation of autologous adipose-derived mesenchymal stem cells (ADSCs) on the formation of hyperplastic scar on rabbit ears. Methods: ADSCs were isolated from inguinal fat of six New Zealand rabbits and then sub-cultured. ADSCs of the third passage of each rabbit were used in the following experiments. Six full-thickness skin defect wounds with diameter of 6 mm on the ventral surface of every rabbit ear were made. Wound healing and local-tissue proliferation were observed, and complete epithelization time of wounds and formation time of hyperplastic scar were recorded. The wounds on left ears were selected as group ADSCs, and the wounds on right ears were selected as control group, with 36 wounds in each group. After the complete epithelization of wounds (post injury day 25), 0.2 mL bromodeoxyuridine (BrdU) labeled autologous ADSCs with the concentration of 5×10(6) per milliliter were injected into each wound of the rabbit of group ADSCs, while the same amount of phosphate buffer solution was injected into each wound of the rabbit of control group. The frequency of injection was once every 5 days, totally for 3 times, and the latter 2 times were injected into scars generated from healed wound. Hyperplastic scars of rabbits of two groups were harvested on the fifth day after the third injection, then the morphology was observed by HE staining, and the arrangement of collagen in hyperplastic scar was observed by VG staining. The distribution of BrdU-labeled ADSCs in the hyperplastic scar was observed with fluorescence microscope. The protein content of type Ⅰ collagen, type Ⅲ collagen, transforming growth factor β1 (TGF-β1), and decorin in hyperplastic scar were detected by enzyme-linked immunosorbent assay, and the mRNA expression of decorin and TGF-β1 in hyperplastic scar were tested by real-time fluorescent quantitative reverse transcription-polymerase chain reaction. Data were proc