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Sample records for cd44 expression positively

  1. CD44 variant expression in cutaneous T-cell lymphoma.

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    Orteu, C H; Li, W; Allen, M H; Smith, N P; Barker, J N; Whittaker, S J

    1997-07-01

    Expression of the lymphocyte homing receptor CD44 and its splice variants have been linked to tumour dissemination and poor prognosis in non-Hodgkin's lymphoma. Specifically, the in vitro expression of variant exon V6 confers metastatic potential in rat pancreatic carcinoma cell lines. In this study, we investigated the expression of CD44 splice variants in cutaneous T-cell lymphomas, including patients with mycosis fungoides (MF), Sezary syndrome (SS), large-cell anaplastic lymphoma (LCAL) and HTLV1-associated cutaneous lymphoma. In addition, 4 involved lymph nodes from 2 patients with MF and 1 patient with SS were examined. Inflammatory dermatoses, lichen planus and psoriasis, and normal skin were also studied. Immunohistochemistry was performed using a panel of monoclonal antibodies, including those with specificity for CD44H (standard isoform) and variant exons V3, V6 and V8-9. Normal epidermal keratinocytes were consistently CD44H and CD44 V3, V6 and V8-9 positive. In all the different clinicopathological subtypes and stages of cutaneous T-cell lymphomas, including involved lymph nodes, tumour cells consistently expressed CD44H, but were CD44 V3 and V6 negative. CD44 V8-9 was expressed on a majority of tumour cells in 2/5 LCAL and on occasional tumour cells in 2/5 LCAL. Occasional V8-9 positive tumour cells were also identified in 6/13 MF, 1/4 SS and 3/4 HTLV1. In 2/3 lymph node samples from 2 patients with tumour-stage MF, CD44 V8-9 expression was found on a small percentage of atypical mononuclear cells. Scattered V8-9 positive dermal mononuclear cells were present in sections of lichen planus and psoriasis. We have found no evidence to suggest that the metastasis-associated CD44 variant exon (V6) is expressed in cutaneous T-cell lymphoma, or that CD44H expression is associated with an adverse prognostic group. It is not clear whether the strong expression of CD44 V8-9 in 2 patients with CD30 positive LCAL reflects activation status or metastatic potential.

  2. Expression of CD44v6 and Its Association with Prognosis in Epithelial Ovarian Carcinomas

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    Dang-xia Zhou

    2012-01-01

    Full Text Available The aim of this study was to evaluate CD44v6 protein expression and its prognostic value of CD44v6 in ovarian carcinoma. The expression of CD44v6 was analyzed in 62 patients with ovarian carcinoma by immunohistochemical method. The data obtained were analyzed by univariate and multivariate analyses. The present study clearly demonstrates that tumor tissues from 41 (66.1% patients showed positive expression with CD44v6. The expression of CD44v6 was significantly correlated with histological type, FIGO stage and histological grade of ovarian carcinomas. Concerning the prognosis, the survival period of patients with CD44v6 positive was shorter than that of patients with CD44v6 negative (36.6% versus 66.7%, 5-year survival, P<0.05. Univariate analysis showed that CD44v6 expression, histological type, FIGO stage and histological grade were associated with 5-year survival, and CD44v6 expression was associated with histological type, FIGO stage and histological grade and 5-year survival. In multivariate analysis, using the COX-regression model, CD44v6 expression was important prognostic factor. In conclusion, these results suggest that CD44v6 may be related to histological type, FIGO stage and histological grade of ovarian carcinomas, and CD44v6 may be an important molecular marker for poor prognosis in ovarian carcinomas.

  3. Multifunctionalized iron oxide nanoparticles for selective drug delivery to CD44-positive cancer cells.

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    Aires, Antonio; Ocampo, Sandra M; Simões, Bruno M; Josefa Rodríguez, María; Cadenas, Jael F; Couleaud, Pierre; Spence, Katherine; Latorre, Alfonso; Miranda, Rodolfo; Somoza, Álvaro; Clarke, Robert B; Carrascosa, José L; Cortajarena, Aitziber L

    2016-02-12

    Nanomedicine nowadays offers novel solutions in cancer therapy and diagnosis by introducing multimodal treatments and imaging tools in one single formulation. Nanoparticles acting as nanocarriers change the solubility, biodistribution and efficiency of therapeutic molecules, reducing their side effects. In order to successfully  apply these novel therapeutic approaches, efforts are focused on the biological functionalization of the nanoparticles to improve the selectivity towards cancer cells. In this work, we present the synthesis and characterization of novel multifunctionalized iron oxide magnetic nanoparticles (MNPs) with antiCD44 antibody and gemcitabine derivatives, and their application for the selective treatment of CD44-positive cancer cells. The lymphocyte homing receptor CD44 is overexpressed in a large variety of cancer cells, but also in cancer stem cells (CSCs) and circulating tumor cells (CTCs). Therefore, targeting CD44-overexpressing cells is a challenging and promising anticancer strategy. Firstly, we demonstrate the targeting of antiCD44 functionalized MNPs to different CD44-positive cancer cell lines using a CD44-negative non-tumorigenic cell line as a control, and verify the specificity by ultrastructural characterization and downregulation of CD44 expression. Finally, we show the selective drug delivery potential of the MNPs by the killing of CD44-positive cancer cells using a CD44-negative non-tumorigenic cell line as a control. In conclusion, the proposed multifunctionalized MNPs represent an excellent biocompatible nanoplatform for selective CD44-positive cancer therapy in vitro.

  4. Multifunctionalized iron oxide nanoparticles for selective drug delivery to CD44-positive cancer cells

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    Aires, Antonio; Ocampo, Sandra M.; Simões, Bruno M.; Josefa Rodríguez, María; Cadenas, Jael F.; Couleaud, Pierre; Spence, Katherine; Latorre, Alfonso; Miranda, Rodolfo; Somoza, Álvaro; Clarke, Robert B.; Carrascosa, José L.; Cortajarena, Aitziber L.

    2016-02-01

    Nanomedicine nowadays offers novel solutions in cancer therapy and diagnosis by introducing multimodal treatments and imaging tools in one single formulation. Nanoparticles acting as nanocarriers change the solubility, biodistribution and efficiency of therapeutic molecules, reducing their side effects. In order to successfully apply these novel therapeutic approaches, efforts are focused on the biological functionalization of the nanoparticles to improve the selectivity towards cancer cells. In this work, we present the synthesis and characterization of novel multifunctionalized iron oxide magnetic nanoparticles (MNPs) with antiCD44 antibody and gemcitabine derivatives, and their application for the selective treatment of CD44-positive cancer cells. The lymphocyte homing receptor CD44 is overexpressed in a large variety of cancer cells, but also in cancer stem cells (CSCs) and circulating tumor cells (CTCs). Therefore, targeting CD44-overexpressing cells is a challenging and promising anticancer strategy. Firstly, we demonstrate the targeting of antiCD44 functionalized MNPs to different CD44-positive cancer cell lines using a CD44-negative non-tumorigenic cell line as a control, and verify the specificity by ultrastructural characterization and downregulation of CD44 expression. Finally, we show the selective drug delivery potential of the MNPs by the killing of CD44-positive cancer cells using a CD44-negative non-tumorigenic cell line as a control. In conclusion, the proposed multifunctionalized MNPs represent an excellent biocompatible nanoplatform for selective CD44-positive cancer therapy in vitro.

  5. MAP kinase pathways and calcitonin influence CD44 alternate isoform expression in prostate cancer cells

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    Yang Kui

    2008-09-01

    Full Text Available Abstract Background Dysregulated expression and splicing of cell adhesion marker CD44 is found in many types of cancer. In prostate cancer (PC specifically, the standard isoform (CD44s has been found to be downregulated compared with benign tissue whereas predominant variant isoform CD44v7-10 is upregulated. Mitogen-activated protein kinase pathways and paracrine calcitonin are two common factors linked to dysregulated expression and splicing of CD44 in cancer. Calcitonin has been found to increase proliferation and invasion in PC acting through the protein kinase A pathway. Methods In androgen-independent PC with known high CD44v7-10 expression, CD44 total and CD44v7-10 RNA or protein were assessed in response to exogenous and endogenous calcitonin and to inhibitors of protein kinase A, MEK, JNK, or p38 kinase. Benign cells and calcitonin receptor-negative PC cells were also tested. Results MEK or p38 but not JNK reduced CD44 total RNA by 40%–65% in cancer and benign cells. Inhibition of protein kinase A reduced CD44 total and v7-10 protein expression. In calcitonin receptor-positive cells only, calcitonin increased CD44 variant RNA and protein by 3 h and persisting to 48 h, apparently dependent on an uninhibited p38 pathway. Cells with constitutive CT expression showed an increase in CD44v7-10 mRNA but a decrease in CD44 total RNA. Conclusion The MEK pathway increases CD44 RNA, while calcitonin, acting through the protein kinase A and p38 pathway, facilitates variant splicing. These findings could be used in the formulation of therapeutic methods for PC targeting CD44 alternate splicing.

  6. A STUDY OF ADHESIVE MOLECULE CD44S CD44V VARIANT EXPRESSION IN GASTRIC CARCINOMA WITH RT-PCR

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Objective:To investigate the correlation between transcript CD44s,CD44v and gastric carcinoma invasion metastasis,and to know what role the CD44 gene's abnormal activity plays in the genesis and development of gastric cancer.Methose RT-PCR was used to detect mRNA of CD44v and CD44s in 10 gastric normal mucosa,8 gastricprecancerous mucosa,10 tissue adjacent to cancer,40 gastric carcinoma(including metastatic focus) with different pathological features,Result:All gastric carcinomas and non-cancerous tissues expressed CD44s,but CD44v expression rate were0%,12.5%,20%and 72.5%.respectively,in normal gastric mucosa,precancerous tissue,tissue adjacent to cancer,carcinoma,Cancer invasion limited to submucosal layer showed lower CD44v expression rate than invasion extended beyond the muscle layer(P0.05),COnclusion:There is a close relation between CD44v and genesis and development of gastric cancer,CD44 gene variant splicing is and early genetic affair in gastric cancer.It Could be a diagnostic tool to screen high0risk people for gastric carcinoma.CD44v can be regard as a parameter in evaluating the potential of cancer cell invasion and metastasis ,as well as prognosis.

  7. Biphasic Dependence of Glioma Survival and Cell Migration on CD44 Expression Level.

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    Klank, Rebecca L; Decker Grunke, Stacy A; Bangasser, Benjamin L; Forster, Colleen L; Price, Matthew A; Odde, Thomas J; SantaCruz, Karen S; Rosenfeld, Steven S; Canoll, Peter; Turley, Eva A; McCarthy, James B; Ohlfest, John R; Odde, David J

    2017-01-03

    While several studies link the cell-surface marker CD44 to cancer progression, conflicting results show both positive and negative correlations with increased CD44 levels. Here, we demonstrate that the survival outcomes of genetically induced glioma-bearing mice and of high-grade human glioma patients are biphasically correlated with CD44 level, with the poorest outcomes occurring at intermediate levels. Furthermore, the high-CD44-expressing mesenchymal subtype exhibited a positive trend of survival with increased CD44 level. Mouse cell migration rates in ex vivo brain slice cultures were also biphasically associated with CD44 level, with maximal migration corresponding to minimal survival. Cell simulations suggest that cell-substrate adhesiveness is sufficient to explain this biphasic migration. More generally, these results highlight the potential importance of non-monotonic relationships between survival and biomarkers associated with cancer progression.

  8. Heterogeneity of CD44 expression among human B-cell subpopulations.

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    Kremmidiotis, G; Ridings, J; Hicks, M; Beckman, I G; Bryson, G; Collins, R; Zola, H

    1998-03-01

    CD44 is a widely distributed cell surface glycoprotein that participates in a number of cellular adhesion and signal transduction processes. Germinal center B cells express very low levels of CD44, whereas their precursors and differentiation products express much higher levels. In immunofluorescence studies comparing 20 antibodies classified as being against the hematopoietic isoform of CD44, one antibody, A1G3, was unreactive with germinal center B cells, whereas the other antibodies showed low intensity but definite reactivity. Western blotting and sequential immunoprecipitation studies of lysates from density-separated lymphocyte fractions showed two bands that were differentially expressed and reacted differently with A1G3 compared with the other CD44 antibodies. These results suggest that germinal center B cells and non-germinal center B cells express different forms of CD44. Of 21 malignant B-cell populations examined, 5 showed reactivity with a "standard" CD44 reagent and significantly reduced reactivity with A1G3, while one sample showed the opposite pattern and the remainder were positive for both reagents. Of 10 cell lines studied, 5 were differentially stained by A1G3 and a standard CD44 antibody. PCR amplification of reverse transcribed mRNA from sorted human tonsil B-cell subpopulations and Southern blotting showed that B cells express a number of splice isoforms of CD44. These results demonstrate that B cells express multiple forms of CD44; both splice insert isoforms and variants distinguished by A1G3; the form of CD44 expressed depends on B-cell differentiation state.

  9. CD44 and MMP-2 expression in urothelial carcinoma

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    Gülgün ERDOĞAN

    2008-09-01

    Full Text Available Aim: CD44, one of the adhesion molecules, is thought to play an important role in cell-cell and cell-matrix interactions. Matrix metalloproteinases are degradative enzymes that remodel extracellular components. In this study the relation of MMP-2 and CD44 expressions with the histologic classification and the pathologic stage of urothelial carcinoma was revealed using immunohistochemistry.Material and Methods: Thirty-nine patients with urothelial carcinoma of the bladder were studied. The histological classification was performed according to WHO criteria. Patients were grouped as infiltrating urothelial carcinoma, low grade non-invasive papillary urothelial carcinoma, and high grade non-invasive papillary urothelial carcinoma. The pathological staging was done according to the TNM classification. Immunohistochemical staining using CD44 and MMP-2 antibodies was performed on tissue blocks.Results: CD44 immunoreactivity was detected in 77% (30/39 of the tumours which was significantly higher in non-invasive papillary urothelial carcinomas, low grade non-invasive papillary urothelial carcinomas, high grade infiltrating urothelial carcinomas (p≥0.05. MMP-2 expression was observed in 69% (27 of 39 of the tumours. There were no significant differences in MMP-2 expression between various histologic subtypes and noninvasive and infiltrative tumours.Conclusion: In conclusion, higher expression of CD44 is inversely correlated with infiltrative potential of urothelial carcinoma. These results should be supported by further studies.

  10. Expression and significance of CD44s, CD44v6, and nm23 mRNA in human cancer

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    Yong-Jun Liu; Pei-Song Yan; Jun Li; Jing-Fen Jia

    2005-01-01

    AIM: To investigate the relationship between the expression levels of nm23 mRNA, CD44s, and CD44v6,and oncogenesis, development and metastasis of human gastric adenocarcinoma, colorectal adenocarcinoma,intraductal carcinoma of breast, and lung cancer.METHODS: Using tissue microarray by immuhistochemical (IHC) staining and in situ hybri-dization (ISH), we examined the expression levels of nm23mRNA, CD44s, and CD44v6 in 62 specimens of human gastric adenocarcinoma and 62 specimens of colorectal adenocarcinoma; the expression of CD44s and CD44v6in 120 specimens of intraductal carcinoma of breast and 20 specimens of normal breast tissue; the expression of nm23 mRNA in 72 specimens of human lung cancer and 23 specimens of normal tissue adjacent to cancer.RESULTS: The expression of nm23 mRNA in the tissues of gastric and colorectal adenocarcinoma was not significantly different from that in the normal tissues adjacent to cancer (P>0.05), and was not associated with the invasion of tumor and the pathology grade of adenocarcinoma (P>0.05). However, the expression of nm23 mRNA was correlated negatively to the lymph node metastasis of gastric and colorectal adenocarcinoma (r = -0.49, P<0.01; r = -4.93, P<0.01). The expression of CD44s in the tissues of gastric and colorectal adenocarcinoma was significantly different from that in the normal tissues adjacent to cancer (P<0.05;P<0.01). CD44v6 was expressed in the tissues of gastric and colorectal adenocarcinoma only, the expression of CD44v6 was significantly associated with the lymph node metastasis, invasion and pathological grade of the tumor (r = 0.47, P<0.01; r = 5.04, P<0.01). CD44sand CD44v6 were expressed in intraductal carcinoma of breast, the expression of CD44s and CD44v6 was significantly associated with lymph node metastases and invasion (P<0.01). However, neither of them was expressed in the normal breast tissue. In addition, the expression of CD44v6 was closely related to the degree of cell

  11. CD24+CD44+胰腺癌细胞的获取及其干细胞特性的初步鉴定%The isolation and functional verification of the cells with CD24CD44 double positive expression from primary human pancreatic adenocarcinomas

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    虞先濬; 刘辰; 徐近; 龙江; 倪泉兴

    2011-01-01

    to isolate a highly tumorigenic subpopulation of cells from primary human pancreatic adenocarcinomas and verify the biological function of the cells. Methods: Primary human pancreatic adenocarcinomas was planted in immunocompromised (NOD-SCID) mice, and then flow cytometry was used to sort the cells into several subpopulation.The sorted cells were cultured in a serum-free DMEM/F12 medium with EGF and FGF to observe the proliferation,passage and spheroid forming capacity of the cells, the cells with those unique features were injected s.c. into NOD/SCID mice to determine the tumorigenicity. The expression of differentiation markers like Ki67, CK7 and DNA methylation regulating factor MBD1 in xenograft tumors was examined by immunohistochemistry, and the expression of Hedgehog and BMI-1 was observed by immunofluorescence method. Results: Through the processes, a highly tumorigenic subpopulation of pancreatic cancer cells were isolated and had been shown positive expression of CD44 and CD24 of cell surface markers. CD24+CD44+ cells could form tumor spheroids in nonadherent culture conditions,and the spheroids also had CD24+CD44+ features and could be passaged multiple times without loss of tumor spheroids forming capability. In vivo study, the tumorigenesis was dependent on the number of the cells that implanted into mice.Some of CD24+CD44+ tumor cells had been observed to also express the differentiation markers Ki67, CK7 and DNA methylation regulating factor MBD1, and the expression of Hedgehog and BMI-1 were significantly up-regulated about 9.95 fold and 2.74 fold, respectively, in CD24+CD44+ cells compared with CD24CD44 cells. Conclusion:The CD24+CD44+ cells are highly tumorigenic subpopulation of pancreatic cancer cells and might be the stem cells of pancreatic adenocarcinomas.

  12. Study on the Relationship between P-glycoprotein and CD44 Expression in Gastric Carcinoma

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    YU Chuanding; XU Shenhua; LING Yutian; ZHU Chihong; ZHOU Xinming; LIU Xianglin

    2006-01-01

    Objective: Investigation of the relationship between P-glycoprotein (P-gp) and adhesion molecule CD44 as well as their clinical significance in gastric carcinoma. Methods: To examine the expressed level of P-gp and CD44 in 98 cases with gastric carcinoma by flow cytometry and evaluate their relationships with clinicopathological factors. Results: Among the 98 gastric carcinomas, 40 cases (40.8%)were P-gp negative (positive cells <25%); 14 cases (14.2%) were 25%-40% expression of P-gp positive cells;17 cases (17.3%) were 41%-60% expression of P-gp positive cells; 27 cases (27.5%) were the high expression(positive cells >60%) of P-gp in all patients with gastric carcinoma. When the tumor sizes were more than6 cm, the P-gp positive of CD44 showed a significant difference (P<0.05) in 35 cases with P-gp positive,compared with it in 24 cases with P-gp negative. When the tumors were in low-moderate differentiated gastric carcinoma, the expression of CD44 showed a significant difference (P<0.05) in 44 cases with P-gp positive, as compared with it in 30 cases with P-gp negative. When the patients were in clinical Ⅲ-Ⅳ stage, the expression of CD44 showed a significant difference (P<0.05) in 42 cases with P-gp positive, as compared with it in 30 cases with P-gp negative. When the patients with lymph node metastasis, their CD44 expression showed a significant difference (P<0.05) in 46 cases with P-gp positive, compared with it in 32 cases with P-gp negative. When the tumors P-gp expressed positive, their CD44 expression will be increase. Conclusion: When the CD44 and P-gp both have the positive high expression, it will be significantly associated with the gastric carcinoma progression and metastasis, so both were a positive expression in gastric carcinoma, it might suggest a poor and unfavorable prognosis result.

  13. Expression of CD44 and P53 in renal cell carcinoma: Association with tumor subtypes

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    Farahnaz Noroozinia

    2014-01-01

    Full Text Available Renal cell carcinoma (RCC is a common malignancy of the kidney and accurate prediction of prognosis is valuable for the design of adjuvant therapy and counseling and effective scheduling of follow-up visits. Molecular genetic investigations of CD44 and P53 in RCC may be helpful in this regard. We studied the CD44 and P53 expressions semi-quantitatively on paraffin-embedded specimens of 64 RCC patients (37 male/27 female who underwent surgery from 2003 to 2008 by immunohistochemistry and analyzed the correlation of P53 and CD44 expression in RCC and outcome. Thirteen of 64 (20.3% specimens were P53 positive, 30/64 (46.9% were CD44 positive and five tumors with positive P53 expressed CD44 protein (P = 0.5. A statistically significant correlation was not found between CD44 and P53 expression (P = 0.5 and age (P = 0.07, sex (P= 0.3, tumor size (P = 0.7, grade (P = 0.23, vascular invasion (P = 1.00 and ureteral invasion (P = 1.00. Furthermore, a significant correlation was not found between P53 expression with age (P = 0.3, sex (P = 0.7, tumor size (P = 0.7, grade (P = 0.1, vascular inva-sion (P = 1.00 and ureteral invasion (P = 1.00. According to our findings, only P53 expression is generally accompanied by non-conventional subtype tumor.

  14. Expression of CD44v6 and Livin in gastric cancer tissue

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    LIANG Yi-zhi; FANG Tai-yong; XU Hai-gang; ZHUO Zhi-qiang

    2012-01-01

    Background CD44v6 plays an important role in invasion and metastasis of tumor,Livin has anti-apoptotic effects.The present study aimed to explore the expression and clinical significance of CD44v6 and Livin in gastric cancer tissue.Methods Streptavidin-peroxidase linked immunohistochemical method was used to determine the expression of CD44v6 and Livin in gastric cancer tissue and adjacent normal gastric tissues from 59 patients with histopathologically confirmed gastric cancer,and in gastric tissue specimens of 15 patients with gastric polyps,and 15 patients with chronic non-atrophic gastritis.The chi-square test was used for comparison of the relevant factors,Spearman's rank correlation test was applied for relationship among positive expression of the proteins.Results The expresion of CD44v6 was positive in 64.4% of the gastric cancer patients; 5.1%,0 and 13.3% in specimens of normal tissues adjacent to the cancer tissues,in gastric tissue specimens of patients with gastric polyps,and patients with chronic non-atrophic gastritis,respectively.The expression of Livin was positive in 52.5% of the gastric cancer tissues,6.8%,0 and 6.7% in the adjacent normal gastric tissue,specimens of patients with gastric polyps and chronic non-atrophic gastritis,respectively.The expression of CD44v6 was significantly correlated with the depth of invasion,the degree of differentiation,and lymphnode metastasis of gastric cancer (P <0.05).The positive expression rate of Livin protein was also significantly correlated with degree of differentiation of gastric cancer cells and metastasis to lymphnodes (P <0.05),but not correlated with the depth of invasion and pathological types (P >0.05).The expression of CD44v6 and Livin in the gastric cancer tissue was positively correlated (rs=0.286,P=-0.028).Conclusions The increased expression of CD44v6 and Livin in gastric cancer tissue may be closely related with development and progression of gastric cancer.CD44v6 and Livin

  15. Conditional expression of CD44 isoforms in lymphoma cells: influence on hyaluronate binding and tumor growth

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    Fu, J.

    2002-03-01

    CD44 describes a family of surface proteins consisting of many isoforms due to alternative splice of ten 'variant' exons. Members of this family are involved in various processes including hematopoiesis, lymphocyte activation and homing, limb development, wound healing and tumor progression. Clinically, CD44 has been shown to be a prognostic factor for several human cancers. To answer the question which isoform might be relevant for tumor progression and to gain an insight into the mechanism of its function, I established transfectants of the LB lymphoma cell line in which the expression of four CD44 isoforms, namely CD44v3-10, CD44v4-10, CD44v8-10 and CD44s, was controlled by the Tet-off promoter. In the presence of Doxycycline, the expression was repressed. Removal of Doxycycline switched on expression and the maximal CD44 amount was obtained within two days. The transfectants were characterized regarding their ability to bind to the extracellular matrix component hyaluronate (HA). Overexpression of all four CD44 isoforms conferred the ability to bind HA on LB cells. Other glycosaminoglycans (GAGs) were bound in an isotype-specific fashion. CD44v3-10, CD44v4-10 and CD44v8-10 showed high binding affinity to chondroitin A, B and C, and low affinity to heparin, heparan sulfate and keratan sulfate. CD44s could not bind to these GAGs. Among these three variants, the binding ability of CD44v3-10 was the strongest. CD44 clustering seemed to play a crucial role for HA binding. Both CD44s and CD44v8-10 formed reduction-sensitive complexes in LB cells. The complexes are homooligomers or heterooligomers composed of different isoforms. Cys286 in CD44 transmember domain was not responsible for the formation of reduction-sensitive oligomer or for the enhanced HA binding in LB cell line. Using a conditional dimerization system the requirement of CD44 oligomerization for HA binding was directly demonstrated. The induction of oligomerization increased HA binding

  16. Brain metastasis is predetermined in early stages of cutaneous melanoma by CD44v6 expression through epigenetic regulation of the spliceosome.

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    Marzese, Diego M; Liu, Michelle; Huynh, Jamie L; Hirose, Hajime; Donovan, Nicholas C; Huynh, Kelly T; Kiyohara, Eiji; Chong, Kelly; Cheng, David; Tanaka, Ryo; Wang, Jinhua; Morton, Donald L; Barkhoudarian, Garni; Kelly, Daniel F; Hoon, Dave S B

    2015-01-01

    Melanoma brain metastasis (MBM) is frequent and has a very poor prognosis with no current predictive factors or therapeutic molecular targets. Our study unravels the molecular alterations of cell-surface glycoprotein CD44 variants during melanoma progression to MBM. High expression of CD44 splicing variant 6 (CD44v6) in primary melanoma (PRM) and regional lymph node metastases from AJCC Stage IIIC patients significantly predicts MBM development. The expression of CD44v6 also enhances the migration of MBM cells by hyaluronic acid and hepatocyte growth factor exposure. Additionally, CD44v6-positive MBM migration is reduced by blocking with a CD44v6-specific monoclonal antibody or knocking down CD44v6 by siRNA. ESRP1 and ESRP2 splicing factors correlate with CD44v6 expression in PRM, and ESRP1 knockdown significantly decreases CD44v6 expression. However, an epigenetic silencing of ESRP1 is observed in metastatic melanoma, specifically in MBM. In advanced melanomas, CD44v6 expression correlates with PTBP1 and U2AF2 splicing factors, and PTBP1 knockdown significantly decreases CD44v6 expression. Overall, these findings open a new avenue for understanding the high affinity of melanoma to progress to MBM, suggesting CD44v6 as a potential MBM-specific factor with theranostic utility for stratifying patients.

  17. Pancreatic cancer cells express CD44 variant 9 and multidrug resistance protein 1 during mitosis.

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    Kiuchi, Shizuka; Ikeshita, Shunji; Miyatake, Yukiko; Kasahara, Masanori

    2015-02-01

    Pancreatic cancer is one of the most lethal cancers with high metastatic potential and strong chemoresistance. Its intractable natures are attributed to high robustness in tumor cells for their survival. We demonstrate here that pancreatic cancer cells (PCCs) with an epithelial phenotype upregulate cell surface expression of CD44 variant 9 (CD44v9), an important cancer stem cell marker, during the mitotic phases of the cell cycle. Of five human CD44(+) PCC lines examined, three cell lines, PCI-24, PCI-43 and PCI-55, expressed E-cadherin and CD44 variants, suggesting that they have an epithelial phenotype. By contrast, PANC-1 and MIA PaCa-2 cells expressed vimentin and ZEB1, suggesting that they have a mesenchymal phenotype. PCCs with an epithelial phenotype upregulated cell surface expression of CD44v9 in prophase, metaphase, anaphase and telophase and downregulated CD44v9 expression in late-telophase, cytokinesis and interphase. Sorted CD44v9-negative PCI-55 cells resumed CD44v9 expression when they re-entered the mitotic stage. Interestingly, CD44v9(bright) mitotic cells expressed multidrug resistance protein 1 (MDR1) intracellularly. Upregulated expression of CD44v9 and MDR1 might contribute to the intractable nature of PCCs with high proliferative activity.

  18. Expression of p53 and CD44 in Canine Breast Tumor

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    LIU Yun; CUI Wen; CHENG Xi; FENG Xinchang

    2008-01-01

    The p53 and CD44 expression of 10 cases in canine breast tumor were examined utilizing immunohistochemical assay with rabbit anti-mouse polyclonal antibodies against p53 or CD44,respectively.The p53 expression was significantly higher in malignant than in benign breast tumor.The expression of CD44 was not significantly different in malignant breast cancer and benign breast tumor.This suggests that p53 can be used as an indicator for animal prognosis.

  19. Changes in CD44 expression during B cell differentiation in the human tonsil.

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    Kremmidiotis, G; Zola, H

    1995-04-01

    CD44 is a widely distributed cell surface glycoprotein that has been implicated in a number of cellular adhesion processes and signal transduction events. These functional capabilities qualify CD44 as a potential mediator of contact-signaling events underlying the process of antigen-dependent B cell differentiation in secondary lymphoid tissues. We postulated that changes in the expression of CD44 during B cell differentiation reflect the cells' changing requirements for this receptor. It has been reported that germinal center B cells are low to negative for CD44 expression, implying that the receptor is lost upon activation. Correlation of the expression of CD44 with surface immunoglobulin and a number of B cell differentiation markers revealed a trimodal expression pattern. High levels of CD44 are expressed on resting IgD+/IgM+ cells. The receptor is still expressed at the early activation stage defined by the expression of CD23. At the early blast stage, when the blast marker CD38 appears on the cell surface and IgD and CD23 disappear, CD44 is downregulated. The majority of CD38+/IgM+ blasts and CD38+/Ig- centroblasts are CD44 low/negative. The receptor is re-upregulated at the point of transition from the centroblast to the centrocyte level. Centrocytes expressing IgG or IgA comprise CD44high and CD44low fractions. IgG+ or IgA+ cells at the postgerminal center stage express high levels of CD44. The functional implications of this expression pattern are discussed.

  20. MicroRNA miR-328 regulates zonation morphogenesis by targeting CD44 expression.

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    Chia-Hui Wang

    Full Text Available Morphogenesis is crucial to initiate physiological development and tumor invasion. Here we show that a microRNA controls zonation morphogenesis by targeting hyaluronan receptor CD44. We have developed a novel system to study microRNA functions by generating constructs expressing pre-miRNAs and mature miRNAs. Using this system, we have demonstrated that expression of miR-328 reduced cell adhesion, aggregation, and migration, and regulated formation of capillary structure. Protein analysis indicated that miR-328 repressed CD44 expression. Activities of luciferase constructs harboring the target site in CD44, but not the one containing mutation, were repressed by miR-328. Zonation morphogenesis appeared in cells transfected by miR-328: miR-328-transfected cells were present on the surface of zonating structures while the control cells stayed in the middle. MiR-328-mediated CD44 actions was validated by anti-CD44 antibody, hyaluronidase, CD44 siRNA, and CD44 expression constructs. In vivo experiments showed that CD44-silencing cells appeared as layers on the surfaces of nodules or zonating structures. Immuno-histochemistry also exhibited CD44-negative cells on the surface layers of normal rat livers and the internal zones of Portal veins. Our results demonstrate that miR-328 targets CD44, which is essential in regulating zonation morphogenesis: silencing of CD44 expression is essential in sealing the zonation structures to facilitate their extension and to inhibit complex expansion.

  1. Alteration of CD44 expression in HIV type 1-infected T cell lines.

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    Giordanengo, V; Limouse, M; Doglio, A; Lesimple, J; Lefebvre, J C

    1996-11-20

    CD44 is known to interfere in HIV replication and to participate in many physiological processes such as lymphocyte binding to high endothelial venules of lymphoid tissue, lymph nodes, and mucosal endothelium. The T cell lines MOLT-4 and CEM, and CEM subclones were infected with the HIV-1 LAI strain and monitored for the expression of CD44 during the course of chronic virus production until the infected cells were at the stage of latent infection. The levels of CD44 protein expression were quantified using cell surface immunostaining and biotinylation. The maturation of CD44 molecules was evaluated by metabolic sulforadiolabeling and CD44 mRNA was visualized by Northern blot analysis. We show a downmodulation of CD44 expression in infected T cell lines and subclones. This phenomenon was most evident at the stage of latent infection. Then, CD44 molecules were undetectable at both the protein and mRNA levels in latently infected CEM cells and CEM subclones. In addition, the 97-kDa standard CD44 isoform showed a shift upward, while detectable during the stage of chronic virus production. In latently infected MOLT-4 cells, the CD44 protein levels were dramatically decreased; CD44 mRNA was detected, but the sizes differed from the mRNA in uninfected cells. Since CD44 is known to regulate in part lymphocyte homing and HIV replication, the alterations that were observed in the expression of this molecule could interfere with the particular homing of HIV-infected cells and/or viral latency.

  2. The Prognostic Significance of CD44V6, CDH11, and β-Catenin Expression in Patients with Osteosarcoma

    Directory of Open Access Journals (Sweden)

    Zhouming Deng

    2013-01-01

    Full Text Available This study aimed to examine the expression of and the relationship between CD44V6, CDH11, and β-catenin. The expression of these cell adhesion molecules was detected in 90 osteosarcoma and 20 osteochondroma specimens using immunohistochemistry. Associations between these parameters and clinicopathological data were also examined. The expression rates of CD44V6, CDH11, and β-catenin were 25.0% (5/20, 70.0% (14/20, and 20.0% (4/20 in osteochondroma specimens, respectively. Compared to osteochondromas, the proportions of expression of CD44V6 and β-catenin in osteosarcoma specimens increased to 65.6% (59/90 and 60.0% (54/90, respectively. However, the expression rate of CDH11 in osteosarcomas was reduced to 40.0% (36/90. The expression of these markers was significantly associated with metastasis and overall survival (P<0.05. Survival analysis revealed that patients with increased expression of CD44V6 and β-catenin as well as decreased expression of CDH11 were correlated with a shorter survival time. Multivariate analysis indicated that clinical stage, metastasis status, and the expression of CD44V6, CDH11, and β-catenin were found to be associated with overall survival. Further, the expression of β-catenin and that of CD44V6 were positively correlated with each other. Thus, our results indicated abnormal expression of CD44V6, CDH11, and β-catenin in osteosarcomas and osteochondromas, which may provide important indicators for further research.

  3. Relationship between P-glycoprotein and CD44 expression in esophageal carcinoma%食管癌细胞P-糖蛋白与CD44表达相关性研究

    Institute of Scientific and Technical Information of China (English)

    许沈华; 凌雨田; 朱赤红

    2006-01-01

    Objective: To investigate the relationship between P-glycoprotein (P-gp) and adhesion molecule CD44 expression as well as their clinical significance in esophageal carcinoma.Methods: To examine the expressed level of P-gp and CD44 by flow cytometry (FCM) in the operated samples of 70 cases with esophageal carcinoma and their normal mucosa of esophageal incision,and to evaluate their relationship with clinicopathological factors.Results: Among the 70 cases with esophageal carcinoma,the expression of P-gp in the 27 cases (38.6%) was negative (positive cells <25%); 11 cases (15.7%) were 25%-40%expression of P-gp positive cells; 14 cases (20%) were 41%-60% expression of P-gp positive cells; 18 cases (25.7%) were the high expression (positive cells >60%) of P-gp.Of the cases with the tumor sizes being more than 4 cm,the expression of CD44showed a significant difference (P<0.05) in 25 cases with P-gp positive,compared with 19 cases with P-gp negative.Of the cases with high-mild differentiated esophageal carcinoma,the expression of CD44 showed a significant difference (P<0.05) in 22 cases with P-gp positive,compared with 17 cases with P-gp negative.Of the cases with clinical Ⅲ--Ⅳ stage,the expression of CD44 showed a significant difference (P<0.05) in 26 cases with P-gp positive,compared with 10 cases with P-gp negative.Of the cases with lymph node metastasis,the CD44 expression showed a significant difference (P=0.050)in 27 cases with P-gp positive,compared with 11 cases with P-gp negative.Of the cases of the patients' age being more than 56 years,the expression of CD44 showed a significant difference (P<0.01) in 27 cases with P-gp positive,compared with 12 cases with P-gp negative.When the P-gp and CD44 expression were positive,the clinical Ⅱ stage and Ⅲ-Ⅳ stage in esophageal carcinoma was showed a significant difference (P<0.05).Conclusion: When the CD44 and P-gp both have the positive high expression,it will be significantly associated with the

  4. Expression of CD44v6 gene in normal human peripheral blood

    Institute of Scientific and Technical Information of China (English)

    Jian Song; Dong-Sheng Zhang; Jie Zheng

    2005-01-01

    AIM: To investigate if CD44v6 could be used as a molecular marker of cancer progression and metastasis through the detection of CD44v6 gene expression in normal human peripheral blood.METHODS: RNA was extracted from the peripheral blood mononuclear cells of 50 healthy donors, the expression of CD44v6 was investigated using reverse transcriptasepolymerase chain reaction (RT-PCR).RESULTS: CD44v6 mRNA was detected in 58% of healthy volunteers under the proper controls.CONCLUSION: Our results suggest that the measurement of CD44v6 expression in peripheral blood by RT-PCR is not suitable for detection of circulating tumor cells.

  5. Expression of CD44 and MMP-2: Possible Association with Histopathological Features of Pleuro-Pulmonary Solitary Fibrous Tumors

    Directory of Open Access Journals (Sweden)

    Funda DEMİRAĞ

    2011-05-01

    Full Text Available Objective: Recent studies have shown that tumor cell adhesion molecules CD44 and matrix metalloproteinases (MMP-2 are expressed strongly in many tumors and associated closely with invasion and metastasis of these tumors. Although solitary fibrous tumors (SFT have a good prognosis, a minority behave malignantly. The aim of this study was to analyze the correlation between CD44 and MMP-2 expression with histopathological parameters in SFT.Material and Method: Haemotaxylin-Eosin stained sections of 10 patients with SFT were reexamined for evaluation of histopathological parameters. Immunostaining of CD44 and MMP-2 was performed by using the streptavidin-biotin method with mouse monoclonal antibody.Results: Our cases consisted of three male and seven female patients with a mean age of 54.5 years. Three patients had a history of asbest exposure. Complete resection was performed in 2 malignant (multiple masses and 8 benign SFT cases. One intrapulmonary tumor was treated with pneumonectomy. 3 cases originated from the right and 7 from the left hemithorax. Tumor size ranged from 5 to 27cm. All cases expressed strong CD44. Only 2 malignant SFT and intrapulmonary SFT expressed focal MMP-2.Conclusion: Although MMP-2 positivity was observed in 2 malignant cases, CD44 positivity was not associated with malignancy criteria in solitary fibrous tumors.

  6. CD44v3和CD44v5在口腔黏液表皮样癌中的表达及临床意义%Expression and clinical significance of CD44v3 and CD44v5 in oral mucoepidermoid carcinoma

    Institute of Scientific and Technical Information of China (English)

    马; 胡姗姗; 周洋; 孙昊量; 李慧; 栗巧玲

    2015-01-01

    Objective To detect the expression of the cell surface adhesion molecule CD44v3 and CD44v5 in oral mucoepidermoid carcinoma (OMC),and to explore the relationship between the two and the occurrence,pathological grade and clinical stage of OMC. Methods Immunohistochemical staining was used to detect the exprssion of CD44v3 and CD44v5 protein in 40 cases of OMC in paraffin embedded specimens, and were statistically analyzed. Results CD44v3 and CD44v5 expression rates in OMC compared with the control group was significantly higher ( 0.05). Conclusion OMC in the lymph node metastasis,CD44v3 and CD44v5 may play an important role,CD44v3,CD44v5 may be one of the important indexesto understand the transfer of OMC lesion development and the biological behavior of lymph node.%目的:通过检测细胞表面黏附分子CD44v3和CD44v5在口腔黏液表皮样癌(Oral mucoepidermoid carcinoma,OMC)中的表达,探讨二者与OMC的发生、病理分级和临床分期的关系。方法:利用免疫组织化学方法检测40例OMC石蜡标本中CD44v3和CD44v5蛋白表达,并且分组进行统计学分析。结果:CD44v3和CD44v5在OMC中表达率与正常对照组相比有显著升高(<0.05),不同病理分级、临床分期之间并无显著性差异(>0.05)。结论:在OMC的淋巴结转移中,CD44v3和CD44v5可能起着重要作用,CD44v3、CD44v5可能成为了解OMC病变发生发展生物学行为及淋巴结转移重要的生物学指标之一。

  7. Prognostic significance of CD44s expression in resected non-small cell lung cancer

    Directory of Open Access Journals (Sweden)

    Ko Yoon

    2011-08-01

    Full Text Available Abstract Background CD44s is a cell adhesion molecule known to mediate cellular adhesion to the extracellular matrix, a prerequisite for tumor cell migration. CD44s plays an important role in invasion and metastasis of various cancers. In the present study, we sought to determine whether CD44s is involved in clinical outcomes of patients with resected non-small cell lung cancer (NSCLC. Methods Using immunohistochemical staining, we investigated CD44s protein expression using tissue array specimens from 159 patients with resected NSCLC (adenocarcinoma (AC; n = 82 and squamous cell carcinoma (SCC; n = 77. Additionally, the immunoreactivity of cyclooxygenase (COX-2 was also studied. The clinicopathological implications of these molecules were analyzed statistically. Results High CD44s expression was detected more frequently in NSCLC patients with SCC (66/72; 91.7% than in those with AC histology (P 0.001. Additionally, high CD44s expression was significant correlated with more advanced regional lymph node metastasis (P = 0.021. In multivariate analysis of survival in NSCLC patients with AC histology, significant predictors were lymph node metastasis status (P P = 0.046, and high CD44s expression (P = 0.014. For NSCLC patients with SCC histology, the significant predictor was a more advanced tumor stage (P = 0.015. No significant association was found between CD44s and clinical outcome (P = 0.311. Conclusions High CD44s expression was a negative prognostic marker with significance in patients with resected NSCLC, particularly those with AC histology, and was independent of tumor stage.

  8. CD44, Sonic Hedgehog, and Gli1 Expression Are Prognostic Biomarkers in Gastric Cancer Patients after Radical Resection

    OpenAIRE

    Chen Jian-Hui; Zhai Er-Tao; Chen Si-Le; Wu Hui; Wu Kai-Ming; Zhang Xin-Hua; Chen Chuang-Qi; Cai Shi-Rong; He Yu-Long

    2016-01-01

    Aim. CD44 and Sonic Hedgehog (Shh) signaling are important for gastric cancer (GC). However, the clinical impact, survival, and recurrence outcome of CD44, Shh, and Gli1 expressions in GC patients following radical resection have not been elucidated. Patients and Methods. CD44, Shh, and Gli1 protein levels were quantified by immunohistochemistry (IHC). The association between CD44, Shh, and Gli1 expression and clinicopathological features or prognosis of GC patients was determined. The biomar...

  9. miR-199a-3p targets CD44 and reduces proliferation of CD44 positive hepatocellular carcinoma cell lines

    Energy Technology Data Exchange (ETDEWEB)

    Henry, Jon C. [Department of Surgery, Ohio State University Medical Center, Columbus, OH (United States); Park, Jong-Kook; Jiang, Jinmai; Kim, Ji Hye [College of Pharmacy, Ohio State University, Columbus, OH (United States); Nagorney, David M.; Roberts, Lewis R. [Divisions of Gastroenterology and Hepatology, Mayo Clinic College of Medicine, Rochester, MN (United States); Banerjee, Soma [Center for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research, Kolkata (India); Schmittgen, Thomas D., E-mail: Schmittgen.2@osu.edu [College of Pharmacy, Ohio State University, Columbus, OH (United States)

    2010-12-03

    Research highlights: {yields} miR-199a-3p targets CD44 in HCC. {yields} Proliferation and invasion are reduced by miR-199a-3p in CD44+ HCC. {yields} miR-199a-3p is reduced and CD44 protein is increased in HCC tissues. {yields} The duplex form of miR-199a-3p mimetic is required for activity. -- Abstract: Previous work by us and others reported decreased expression of miR-199a-3p in hepatocellular carcinoma (HCC) tissues compared to adjacent benign tissue. We report here a significant reduction of miR-199a-3p expression in 7 HCC cell lines. To determine if miR-199a-3p has a tumor suppressive role, pre-miR-199a-3p oligonucleotides were transfected into the HCC cell lines. Pre-miR-199a-3p oligonucleotide reduced cell proliferation by approximately 60% compared to control oligonucleotide in only two cell lines (SNU449 and SNU423); the proliferation of the other 5 treated cell lines was similar to control oligonucleotide. A pre-miR-199a-3p oligonucleotide formulated with chemical modifications to enhance stability while preserving processing, reduced cell proliferation in SNU449 and SNU423 to the same extent as the commercially available pre-miR-199a-3p oligonucleotide. Furthermore, only the duplex miR-199a-3p oligonucleotide, and not the guide strand alone, was effective at reducing cell viability. Since a CD44 variant was essential for c-Met signaling [V. Orian-Rousseau, L. Chen, J.P. Sleeman, P. Herrlich, H. Ponta, CD44 is required for two consecutive steps in HGF/c-Met signaling, Genes Dev. 16 (2002) 3074-3086] and c-Met is a known miR-199a-3p target, we hypothesized that miR-199a-3p may also target CD44. Immunoblotting confirmed that only the two HCC lines that were sensitive to the effects of pre-miR-199a-3p were CD44+. Direct targeting of CD44 by miR-199a-3p was confirmed using luciferase reporter assays and immunoblotting. Transfection of miR-199a-3p into SNU449 cells reduced in vitro invasion and sensitized the cells to doxorubicin; both effects were enhanced

  10. EXPRESSION AND CLINICAL SIGNIFICANCE OF CD44 IN THE PERIPHERAL BLOOD OF PATIENTS WITH CASTRIC CANCER

    Institute of Scientific and Technical Information of China (English)

    XU; Shen-hua

    2001-01-01

    [1]Li XY, Hu JL. Relationship between the expression of CD44 and tumor of digestive tract & metastasis [J]. Chin J Dig 1999; 19:196.[2]Washington K, Gottfried MR, Telen MJ, et al. Expression of the cell adhesion molecule CD44 in gastric adenocarcinomas [J]. Human Pathol 1994; 25:1043.[3]Tran TA, Kallakury BV, Sheehan CE, et al. Expression of CD44 standard from and variant isoforms in non-small cell lung carcinomas [J]. Human Pathol 1997; 28:809.[4]Wimmel A, Schilli M, Kaiser U, et al. Preferential histiotypic expression of CD44 isoforms in human lung cancer [J]. Lung Cancer 1997; 16:151.[5]Lu GO, Xu SH, Feng JG, et al. Expression and clinical significance of CD44 in peripheral blood in esophageal cancer [J]. Chin J Clin Oncol 1992; 26:500.[6]Xu SH, Feng JG, Li DC, et al. Relationship between CD44 in the peripheral blood of patients with colorectal cancer and clinico-pathological features [J]. Shijie Huaren Xiaohua Zazhi 2000; 8:432.[7]Matsumura Y, Hanbury D, Smith J, et al. Non-invasive detection of malignancy by identification of unusual CD44 gene activity in exfoliated cancer cells [J]. BMJ 1994; 308:619.[8]Reter Herrlich, Margot Zoller, Steven T Pals, et al. CD44 splice variants: metastases meet lymphocytes [J]. Immunology Today 1993; 14:395.[9]Pituch-Noworolska-A, et al. Evaluation of circulating tumor cells expressing CD44 variants in the blood of gastric cancer patients by flow cytometry [J]. Anticancer Res 1998; 18:3747.[10]Guo YJ, Liu GL, Wang XN, et al. Potential use of soluble CD44 in serum as indicator of tumor burden and metastasis in patients with gastric or colon cancer [J]. Cancer Res 1994; 54: 422.[11]Harn HJ, Ho LI, Chang JY, et al. Soluble CD44 isoforms in serum as potential markers of metastatic gastric carcinoma [J]. J Clin Gastroenterol 1996; 22:107.[12]Harn HJ, Ho LI, Chang JY, et al. Differential expression of the human metastasis adhesion molecule CD44 in normal and carcinomatous stomach mucosa

  11. Autophagy positively regulates the CD44(+) CD24(-/low) breast cancer stem-like phenotype.

    Science.gov (United States)

    Cufí, Sílvia; Vazquez-Martin, Alejandro; Oliveras-Ferraros, Cristina; Martin-Castillo, Begoña; Vellon, Luciano; Menendez, Javier A

    2011-11-15

    The molecular mechanisms used by breast cancer stem cells (BCSCs) to survive and/or maintain their undifferentiated CD44(+) CD24(-/low ) mesenchymal-like antigenic state remains largely unexplored. Autophagy, a key homeostatic process of cytoplasmic degradation and recycling evolved to respond to stress conditions, might be causally fundamental in the biology of BCSCs. Stable & specific knockdown of autophagy-regulatory genes by lentiviral-delivered small hairpin (sh) RNA drastically decreased the number of JIMT-1 epithelial BC cells bearing CD44(+) CD24(-/low) cell-surface antigens from ~75% in parental and control (-) shRNA-transduced cells to 26% and 7% in ATG8/LC3 shRNA- and ATG12 shRNA-transduced cells, respectively. Autophagy inhibition notably enhanced transcriptional activation of CD24 gene, potentiating the epithelial-like phenotype of CD44(+) CD24(+) cells versus the mesenchymal CD44(+) CD24(-/low ) progeny. EMT-focused Real Time RT-PCR profiling revealed that genetic ablation of autophagy transcriptionally repressed the gene coding for the mesenchymal filament vimentin (VIM). shRNA-driven silencing of the ATG12 gene and disabling the final step in the autophagy pathway by the antimalarial drug chloroquine both prevented TGFb1-induced accumulation of vimentin in JIMT-1 cells. Knockdown of autophagy-specific genes was sufficient also to increase by up to 11-times the number of CD24(+) cells in MDA-MB-231 cells, a BC model of mesenchymal origin that is virtually composed of CD44(+) CD24(-/low ) cells. Chloroquine treatment augmented the number of CD24(+) cells and concomitantly reduced constitutive overexpression of vimentin in MDA-MB-231 cells. This is the first report demonstrating that autophagy is mechanistically linked to the maintenance of tumor cells expressing high levels of CD44 and low levels of CD24, which are typical of BCSCs.

  12. Expression status of CD44 and CD133 as a prognostic marker in esophageal squamous cell carcinoma treated with neoadjuvant chemotherapy followed by radical esophagectomy.

    Science.gov (United States)

    Okamoto, Koichi; Ninomiya, Itasu; Ohbatake, Yoshinao; Hirose, Atsushi; Tsukada, Tomoya; Nakanuma, Shinichi; Sakai, Seisho; Kinoshita, Jun; Makino, Isamu; Nakamura, Keishi; Hayashi, Hironori; Oyama, Katsunobu; Inokuchi, Masafumi; Nakagawara, Hisatoshi; Miyashita, Tomoharu; Hidehiro, Tajima; Takamura, Hiroyuki; Fushida, Sachio; Ohta, Tetsuo

    2016-12-01

    Cancer stem cells (CSCs) have self-renewal and pluripotency capabilities and contribute to cancer progression and chemoresistance. It has been proposed that the treatment resistance and heterogeneity of CSCs are deeply involved in the prognosis of patients with esophageal squamous cell carcinoma (ESCC). The objective of this study was to identify the influence of the expression status of the CSC markers CD44 and CD133 on chemotherapeutic efficacy and prognosis in ESCC patients who underwent radical esophagectomy after neoadjuvant chemotherapy (NAC). Endoscopically biopsied specimens taken before NAC and surgically resected specimens after NAC were immunohistochemically assessed for CD44 and CD133 expression for 47 ESCC patients who underwent NAC followed by radical esophagectomy. The correlation between CD44 and CD133 expression status and clinicopathological findings and the prognosis of ESCC patients after NAC followed by esophagectomy were analyzed. The percentages of CD44-positive cells and CD133-positive cells in specimens were increased after NAC. CD44 and CD133 expression status before NAC did not correlate with the degree of tumor progression and had no impact on the chemotherapeutic effect. However, strong expression of CD44 or CD133 and a high proportion of CD133-expressing cells before NAC were significantly associated with poorer esophageal cancer-specific survival. Patients with strong expression of CD44 or CD133 and those with a high ratio of CD133-positive tumor cells showed significantly poor prognosis regardless of the effect of chemotherapy. Multivariate analysis showed that simultaneous strong expression of CD44 and CD133 before NAC, a high rate of CD133-positive tumor cells before NAC, and primary tumor remission assessed by preoperative endoscopy were significant independent prognostic factors for ESCC. Our data indicate that CD44 and CD133 expression status prior to treatment dictates the malignant potential of ESCC and may be a novel

  13. Relationship between LYVE-1, VEGFR-3 and CD44 gene expressions and lymphatic metastasis in gastric cancer

    Institute of Scientific and Technical Information of China (English)

    FusunOzmen; MahirOzmen; EvrenOzdemir; MunevverMoran; SeldaSeckin; DicleGUC; ErgunKaraagaoglu; EminKansu

    2011-01-01

    AIM: To investigate the expression levels of lymphatic vessel endothelial hyaluronan receptor-1 (LYVE-1), vascular endothelial growth factor receptor-3 (VEGFR-3) and CD44 genes and the relationship between their levels and clinicopathological parameters in gastric cancer.METHODS: Tissue samples were obtained from 33 patients (8 females) with gastric cancer. mRNA levels of LYVE-1, VEGFR-3 and CD44 in normal and tumor tissues were quantitatively measured using real time polymerase chain reaction. The results were correlated with lymph node metastasis, histological type and differentiation of the tumor, T-stage, and presence of vascular, perineural and lymphatic invasions. The distribution of molecules in the tissue was evaluated using immunohistochemistry. RESULTS: LYVE-1, CD44 and VEGFR-3 gene expression levels were significantly higher in gastric cancer than in normal tissue. While there was no correlation between gene expressions and clinicopathologic fea- tures such as histologic type, differentiation and stage, gene expression levels were found to be increased in conjunction with positive lymph node/total lymph node ratio and the presence of perineural invasion. A significant correlation was also found between LYVE-1 and CD44 over-expressions and perineural invasion and lymph node positivity in gastric cancers. When the dis- tribution of LYVE-1 antibody-stained lymphatic vessels in tissue was evaluated, lymphatic vessels were located intra-tumorally in 13% and peri-tumorally in 27% of the patients. Moreover, lymph node metastases were also positive in all patients with LYVE-1-staining. CONCLUSION: LYVE-1, VEGFR-3 and CD44 all play an important role in lymphangiogenesis, invasion and metastasis. LYVE-1 is a perfectly reliable lymphatic vessel marker and useful for immunohistochemistry.

  14. Satellite Cells CD44 Positive Drive Muscle Regeneration in Osteoarthritis Patients

    Directory of Open Access Journals (Sweden)

    Manuel Scimeca

    2015-01-01

    Full Text Available Age-related bone diseases, such as osteoarthritis and osteoporosis, are strongly associated with sarcopenia and muscle fiber atrophy. In this study, we analyzed muscle biopsies in order to demonstrate that, in osteoarthritis patients, both osteophytes formation and regenerative properties of muscle stem cells are related to the same factors. In particular, thanks to immunohistochemistry, transmission electron microscopy, and immunogold labeling we investigated the role of BMP-2 in muscle stem cells activity. In patients with osteoarthritis both immunohistochemistry and transmission electron microscopy allowed us to note a higher number of CD44 positive satellite muscle cells forming syncytium. Moreover, the perinuclear and cytoplasmic expression of BMP-2 assessed by in situ molecular characterization of satellite cells syncytia suggest a very strict correlation between BMP-2 expression and muscle regeneration capability. Summing up, the higher BMP-2 expression in osteoarthritic patients could explain the increased bone mineral density as well as decreased muscle atrophy in osteoarthrosic patients. In conclusion, our results suggest that the control of physiological BMP-2 balance between bone and muscle tissues may be considered as a potential pharmacological target in bone-muscle related pathology.

  15. Expression and Significance of KAI1 and CD44 V6 in Gastric Carcinoma%KAI1及 CD44 V6在胃癌中的表达及意义

    Institute of Scientific and Technical Information of China (English)

    王武; 谢金标; 杨天宝; 卢辉山; 张捷

    2014-01-01

    目的:研究KAI1和CD44 V6在胃癌中的表达和意义,探讨它们之间的关系。方法采用免疫组化技术检测61例胃癌组织和20例癌旁正常胃组织中KAI1和CD44V6的表达情况。结果胃癌组织中KAI1蛋白的阳性率显著低于癌旁正常胃组织(P<0.05);胃癌组织中 CD44V6蛋白的阳性率显著高于癌旁正常胃组织(P<0.05);KAI1、CD44V6的表达与胃癌的浆膜侵犯、临床分期、组织分化程度、淋巴结转移显著相关(P<0.05),而与年龄、性别无关(P>0.05)。 KAI1与CD44V6在胃癌组织中的表达呈负相关(P<0.01)。结论 KAI1与CD44V6在胃癌的发生、发展和侵袭转移中起着相互抑制的作用,检测KAI1及CD44 V6蛋白对于判断胃癌的生物学行为具有重要的价值。%Objective To study the expression of KAI1 and CD44V6 in gastric carcinoma and its clinical significance , and to investigate their relationship .Methods SP immunohistochemistry was used to detect the expression of KAI 1 and CD44V6 protein in 61 cases of gastric carcinoma tissues and 20 cases of adjacent normal gastric tissues .Results The positive rate of KAI1 in gastric carcinoma tissues was significantly lower than that of the adjacent normal gastric tissues (P0.05).KAI1 expression was negatively correla-ted with CD44V6 expression(P<0.01).Conclusion KAI1 and CD44V6 protein restrains each other in the happening、devel-opment、invasion and metastasis of gastric carcinoma ,the detection of KAI1 and CD44V6 protein is of important value in evalua-ting biological behaviors of gastric carcinoma .

  16. EXPRESSION AND CLINICAL SIGNIFICANCE OF CD44 IN THE PERIPHERAL BLOOD OF PATIENTS WITH CASTRIC CANCER

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Objective: To investigate the clinical significance of cell adhesive molecule (CD44) expression on periphery blood (PB) of patients with gastric cancer. Methods: Both the level of CD44 and the immunocyte phenotype of the lymphocytes of 110 patients with gastric cancer and 100 healthy subjects were examined by flow cytometry, and the results were analyzed pathologically and statistically. Results: The mean of the CD44% in PB of the healthy subjects was 46.14±13.4 and there were no statistic differences for their age and sex. Site of tumor growth: The significant difference (P 10 cm mass (P<0.0l) and 7-10 cm mass (P<0.05). Degree of tumor differentiation: The significant difference (P<0.01) was present between the patients with low differentiation gastric cancer and normal individuals. The significant difference (P<0.01) was present between patients with metastatic stage: The significant difference (P<0.0l) was present lymph node gastric cancer and normal individuals. Clinical between the patients with advanced or relapsed gastric cancer and normal individuals. Age: The significant difference (P<0.01) was present between the gastric cancer patients under 59 years and normal individuals. Conclusion: The increased level of CD44 in the PB of patients with gastric cancer indicated the possible existence of relapse, advance or metastasis of tumors. When the tumor was poorly differentiated and bigger in tumor mass, the level of CD44% would be higher. Examining the level of CD44 by flow cytometry in the periphery blood of patients with gastric cancer was useful for the prognosis.

  17. Mitogen-activated protein kinases mediate Mycobacterium tuberculosis–induced CD44 surface expression in monocytes

    Indian Academy of Sciences (India)

    Natarajan Palaniappan; S Anbalagan; Sujatha Narayanan

    2012-03-01

    CD44, an adhesion molecule, has been reported to be a binding site for Mycobacterium tuberculosis (M. tuberculosis) in macrophages and it also mediates mycobacterial phagocytosis, macrophage recruitment and protective immunity against pulmonary tuberculosis in vivo. However, the signalling pathways that are involved in M. tuberculosis–induced CD44 surface expression in monocytic cells are currently unknown. Exposure of THP-1 human monocytes to M. tuberculosis H37Rv and H37Ra induced distinct, time-dependent, phosphorylation of mitogen-activated protein kinase kinase-1, extracellular signal regulated kinase 1/2, mitogen-activated protein kinase kinase 3/6, p38 mitogen-activated protein kinase and c-jun N-terminal kinases. The strains also differed in their usage of CD14 and human leukocyte antigen-DR (HLA-DR) receptors in mediating mitogen-activated protein kinase activation. M. tuberculosis H37Rv strain induced lower CD44 surface expression and tumour necrosis factor-alpha levels, whereas H37Ra the reverse. Using highly specific inhibitors of mitogen-activated protein kinase kinase-1, p38 mitogen-activated protein kinase and c-jun N-terminal kinase, we report that inhibition of extracellular signal regulated kinase 1/2 and c-jun N-terminal kinases increases, but that inhibition of p38 mitogen-activated protein kinase decreases M. tuberculosis–induced CD44 surface expression in THP-1 human monocytes.

  18. Expression of PCNA and CD44mRNA in colorectal cancer with venous invasion and its relationship to liver metastasis

    Institute of Scientific and Technical Information of China (English)

    Shu-Qiang Yue; Yan-Ling Yang; Ke-Feng Dou; Kai-Zong Li

    2003-01-01

    AIM: To investigate the expression of proliferating cell nuclear antigen (PCNA) and CD44mRNA in colorectal cancer with venous invasion and its relationship with liver metastasis.METHODS: Reverse transcriptase-polymerase chain reaction (RT-PCR) was used to detect the expression of PCNA and CD44mRNA in 31 cases of colorectal cancer with venous invasion.RESULTS: Positive expression rates of PCNA and CD44mRNA in colorectal cancer were higher than those without liver metastasis (P<0.05 and P<0.01). In case of colorectal cancer with liver metastasis, strongly positive rates of PCNA and CD44mRNA were 94.1% and 70.6 %,respectively, significantly higher than those without liver metastasis. There was a positive relationship between the expressions of PCNA and CD44mRNA (r=0.67, P<0.05).CONCLUSION: Detection of PCNA and CD44mRNA expression in colorectal cancer may be useful for evaluating liver metastasis of cancer cells.

  19. survivin和CD44v6在非小细胞肺癌中的表达及意义%Expression and significance of survivin and CD44v6 protein in non-small cell lung cancer

    Institute of Scientific and Technical Information of China (English)

    魏霞; 石志红; 嵇喜祥

    2009-01-01

    Objective To investigate the expression and significance of survivin and CD44v6 in non-small cell lung cancer (NSCLC) and their correlation. Methods SP immunohistochemical technique was used to detect the expression of survivin and CD44V6 protein in 53 cases of NSCLC and 13 cases of para-eaneer nor-mal tissues. Results The positive rate of survivin and CD44v6 in NSCLC was 60. 38% and 69. 81% respec-tively,which was higher than that of normal pulmonary tissues adjacent to carcinoma(P 0.05). The expression of survivin was related to TNM stages and cell differentiation (P 0. 05). The expression of CD44v6 in squamous carcinoma was significantly higher than that of adenocareinoma (P 0. 05). There was no correlation between the expression of survivin and C1)44v6 (r = -0. 058, P >0. 05). Conclusion Survivin might be used to evaluate NSCLC development;CD44v6 might be used for the differential diagnosis of squamous carcinoma in NSCLC;both of them might be helpful to predict the metastasis of NSCLC. They might be two independent events in the process of NSCLC genesis and develop-ment.%目的 探讨非小细胞肺癌(NSCLC)中survivin及CD44v6的表达及意义,以及二者的相关性.方法 采用SP免疫组化方法检测survivin及CD44v6在53例NSCLC组织、13例癌旁正常肺组织中的表达.结果 53例NSCLC癌组织中survivin、CD44v6阳性表达率分别是60.38%和69.81%,高于癌旁正常肺组织的表达(P0.05).survivin的表达与临床TNM分期及肿瘤分化程度相关(P0.05).CD44v6在鳞癌的表达率远高于腺癌(P0.05).survivin与CD44v6之间无相关性(r=-0.058,P>0.05).结论 survivin有望作为评估NSCLC病变进展的指标,CD44v6可用来鉴别诊断NSCLC中的鳞癌,二者有可能成为预测NSCLC转移的指标.survivin、CD44v6可能是NSCLC发生发展过程中的两个独立事件.

  20. HDAC inhibitor AR-42 decreases CD44 expression and sensitizes myeloma cells to lenalidomide.

    Science.gov (United States)

    Canella, Alessandro; Cordero Nieves, Hector; Sborov, Douglas W; Cascione, Luciano; Radomska, Hanna S; Smith, Emily; Stiff, Andrew; Consiglio, Jessica; Caserta, Enrico; Rizzotto, Lara; Zanesi, Nicola; Stefano, Volinia; Kaur, Balveen; Mo, Xiaokui; Byrd, John C; Efebera, Yvonne A; Hofmeister, Craig C; Pichiorri, Flavia

    2015-10-13

    Multiple myeloma (MM) is a hematological malignancy of plasma cells in the bone marrow. Despite multiple treatment options, MM is inevitably associated with drug resistance and poor outcomes. Histone deacetylase inhibitors (HDACi's) are promising novel chemotherapeutics undergoing evaluation in clinical trials for the potential treatment of patients with MM. Although in preclinical studies HDACi's have proven anti-myeloma activity, but in the clinic single-agent HDACi treatments have been limited due to low tolerability. Improved clinical outcomes were reported only when HDACi's were combined with other drugs. Here, we show that a novel pan-HDACi AR-42 downregulates CD44, a glycoprotein that has been associated with lenalidomide and dexamethasone resistance in myeloma both in vitro and in vivo. We also show that this CD44 downregulation is in part mediated by miR-9-5p, targeting insulin-like growth factor 2 mRNA binding protein 3 (IGF2BP3), which directly binds to CD44 mRNA and increases its stability. Importantly, we also demonstrate that AR-42 enhances anti-myeloma activity of lenalidomide in primary MM cells isolated from lenalidomide resistant patients and in in vivo MM mouse model. Thus, our findings shed light on potential novel combinatorial therapeutic approaches modulating CD44 expression, which may help overcome lenalidomide resistance in myeloma patients.

  1. Expression and correlation of CD44v6, vascular endothelial growth factor, matrix metalloproteinase-2, and matrix metalloproteinase-9 in Krukenberg tumor

    Institute of Scientific and Technical Information of China (English)

    Ge Lou; Ying Gao; Xiao-Ming Ning; Qi-Fan Zhang

    2005-01-01

    AIM: To explore the expression and correlation of CD44v6,vascular endothelial growth factor (VEGF), matrix metalloproteinase (MMP)-2 and matrix metalloproteinase (MMP)-9 in Krukenberg and primary epithelial ovarian carcinoma.METHODS: The expressions of CD44v6, VEGF, MMP-2and MMP-9 were detected by immunohistochemical method in 20 cases of normal ovarian tissues, 38 cases of Krukenberg tumor and 45 cases of primary epithelial ovarian carcinoma.RESULTS: The expression of CD44v6 (primary epithelial ovarian carcinoma tissue vs normal ovarian tissue:x2= 4.516, P= 0.034; Krukenberg tumor tissue vsnormal ovarian tissue: x2 = 19.537, P= 0.001) and VEGF (primary epithelial ovarian carcinoma tissue vs normal ovarian tissue: P = 0.026; Krukenberg tumor tissue vs normal ovarian tissue: x2= 22.895, P = 0.001) was significantly higher in primary epithelial ovarian carcinoma tissue and Krukenberg tumor tissue than in normal ovarian tissue.The positive expression rate of MMP-2 and MMP-9 was 0%in the normal ovarian tissue. The positive expression rate of CD44v6 (x2 = 10.398, P = 0.001), VEGF (x2 = 13.149,P= 0.001), MMP-2 (x2= 33.668, P= 0.001) and MMP-9(x2= 38.839, P = 0.001) was remarkably higher in Krukenberg tumor than in primary epithelial ovarian carcinoma. The correlation of CD44v6, VEGF, MMP-2, and MMP-9 was observed in primary epithelial ovarian carcinoma and Krukenberg tumor.CONCLUSION: CD44v6, VEGF, MMP-2, and MMP-9 are involved in ovarian carcinoma, gastric cancer and Krukenberg tumor. Detection of CD44v6, VEGF, MMP-2and MMP-9 may contribute to the diagnosis of ovarian carcinoma, gastric cancer, and Krukenberg tumor.

  2. Oropharyngeal malignant epithelial cell, lymphocyte and macrophage CD44 surface receptors for hyaluronate are expressed in sustained EBV infection: immunohistochemical data and EBV DNA tissue indices.

    Science.gov (United States)

    Groma, Valerija; Kazanceva, Anna; Nora-Krukle, Zaiga; Murovska, Modra

    2012-09-15

    The role of CD44 in Epstein-Barr virus (EBV)-related epithelial tumors is poorly understood. We studied the expression of CD44 in EBV infection in patients with oral squamous cell carcinoma (SCC) and nasopharyngeal carcinoma (NPC) and measured the EBV DNA. Whole blood, plasma and tissue samples from 8 male and 2 female patients with oral SCC, NPC, salivary gland lymphoepithelioma, normal salivary gland and buccal mucosa were assayed for EBV DNA. Expression of CD44, latent membrane protein (LMP), and labeling of lymphocytes, macrophages and dendritic cells were estimated by immunohistochemistry. Tissue EBV DNA was detected in 7 of 8 cases (87.5%) of oral malignant, benign and border-line lesions. LMP expression levels in tumors varied from absence and minimal to moderate - 50.3, 43.6, 6.0% and 91.1, 6.7, 2.2% for SCC and NPC, respectively. Levels of CD44 positivity in neoplasms were minimal (15.5 and 16.7%), moderate (30.3 and 47.8%), and diffuse (54.2 and 35.5%) for SCC and NPC, respectively, thus deviating from normal oral mucosa revealing heavily stained (100.0%) epithelial contours. CD19-positive B lymphocytes and S100-positive dendritic cells were intermixed with neoplastic cells. Collectively, CD44 mediated signaling may be implicated in EBV infection associated with the pathogenesis of oral SCC and NPC.

  3. Expression of Monocarboxylate Transporters 1, 2, and 4 in Human Tumours and Their Association with CD147 and CD44

    Directory of Open Access Journals (Sweden)

    Céline Pinheiro

    2010-01-01

    Full Text Available Monocarboxylate transporters (MCTs are important cellular pH regulators in cancer cells; however, the value of MCT expression in cancer is still poorly understood. In the present study, we analysed MCT1, MCT2, and MCT4 protein expression in breast, colon, lung, and ovary neoplasms, as well as CD147 and CD44. MCT expression frequency was high and heterogeneous among the different tumours. Comparing with normal tissues, there was an increase in MCT1 and MCT4 expressions in breast carcinoma and a decrease in MCT4 plasma membrane expression in lung cancer. There were associations between CD147 and MCT1 expressions in ovarian cancer as well as between CD147 and MCT4 in both breast and lung cancers. CD44 was only associated with MCT1 plasma membrane expression in lung cancer. An important number of MCT1 positive cases are negative for both chaperones, suggesting that MCT plasma membrane expression in tumours may depend on a yet nonidentified regulatory protein.

  4. Silencing of CD44 gene expression in human 143-B osteosarcoma cells promotes metastasis of intratibial tumors in SCID mice.

    Directory of Open Access Journals (Sweden)

    Ana Gvozdenovic

    Full Text Available Osteosarcoma (OS is the most frequent primary malignant bone cancer in children and adolescents with a high propensity for lung metastasis. Therefore, it is of great importance to identify molecular markers leading to increased metastatic potential in order to devise more effective therapeutic strategies that suppress metastasis, the major cause of death in OS. CD44, the principal receptor for the extracellular matrix component hyaluronan (HA, is frequently found overexpressed in tumor cells and has been implicated in metastatic spread in various cancer types. Here, we investigated the effects of stable shRNA-mediated silencing of CD44 gene products on in vitro and in vivo metastatic properties of the highly metastatic human 143-B OS cell line. In vitro, CD44 knockdown resulted in a 73% decrease in the adhesion to HA, a 57% decrease in the migration rate in a trans-filter migration assay, and a 28% decrease in the cells' capacity for anchorage-independent growth in soft agar compared to the control cells, implicating that CD44 expression contributes to the metastatic activity of 143-B cells. However, making use of an orthotopic xenograft OS mouse model, we demonstrated that reduced CD44 expression facilitated primary tumor growth and formation of pulmonary metastases. The enhanced malignant phenotype was associated with decreased adhesion to HA and reduced expression of the tumor suppressor merlin in vivo. In conclusion, our study identified CD44 as a metastasis suppressor in this particular experimental OS model.

  5. Endothelial adhesion of synchronized gastric tumor cells changes during cell cycle transit and correlates with the expression level of CD44 splice variants

    Institute of Scientific and Technical Information of China (English)

    Anton Oertl; Jens Castein; Tobias Engl; Wolf-Dietrich Beecken; Dietger Jonas; Richard Melamed; Roman A. Blaheta

    2005-01-01

    AIM: To study adhesion capacity and CD44 expression of human gastric adenocarcinoma MKN45 cells at different stages of a first cell cycle.METHODS: MKN45 cells were synchronized by aphidicolin and assayed for adhesion to an endothelial cell (HUVEC)monolayer. Surface expression of CD44 and CD44 splice variants on MKN45 cells was evaluated by flow cytometry.Functional relevance of CD44 adhesion receptors was investigated by blocking studies using anti CD44 monoclonal antibodies or by hyaluronan digestion.RESULTS: Adhesion of MKN45 to HUVEC was increased during G2/M transit, after which adhesion returned to baseline levels with cell cycle completion. In parallel, CD44splice variants CD44v4, CD44v5, and CD44v7 were all upregulated on MKN45 during cell cycle progression with a maximum effect in G2/M. The function of CD44 surface receptors was assessed with specific receptor blocking monodonal antibodies or removal of hyaluronan by digestion with hyaluronidase. Both strategies inhibited tumor cell adhesion to HUVEC by nearly 50%, which indicates that MKN45-HUVEC-interaction is CD44 dependent.CONCLUSION: CD44 expression level is linked to the cell cycle in gastrointestinal tumor cells, which in turn leads to cell cyde dependent alterations of their adhesion behaviour to endothelium.

  6. Immunohistochemical localization and expression of the hyaluronan receptor CD44 in the epithelium of the pig oviduct during oestrus.

    Science.gov (United States)

    Tienthai, P; Yokoo, M; Kimura, N; Heldin, P; Sato, E; Rodriguez-Martinez, H

    2003-01-01

    Hyaluronan is related to essential reproductive processes in pigs. Hyaluronan produced by cumulus cells builds, via specific cell surface receptors, an extracellular matrix responsible for cumulus cell cloud expansion during final oocyte maturation, a preparatory event for ovulation and fertilization. In addition, hyaluronan that has been localized in the pig oviduct both in the intraluminal fluid and on the surface of the lining epithelium of the preovulatory sperm reservoir, has proven beneficial during in vitro fertilization and embryo culture, thus indicating that it has a role in vivo. This study monitored the immunolocalization, protein determination and gene expression of the major cell surface hyaluronan receptor CD44 in the epithelial lining of the pig oviduct during selected stages of standing oestrus, in relation to spontaneous ovulation. The CD44 immunostaining in the lining epithelium was localized to the surface membrane and the supranuclear domain of mainly the secretory cells, particularly in the sperm reservoir of both treatment (inseminated) and control (non-inseminated) specimens. Up to four hyaluronan-binding protein (HABP) bands (60, 90, 100 and 200 kDa) were detected in the tubal epithelium, and the 200 kDa band was determined as CD44 by immunoblotting. The expression of CD44 mRNA was higher before than after ovulation (P AIJ) of control animals was higher than in those that were inseminated (P AIJ, respectively). The results demonstrate for the first time that the specific hyaluronan receptor CD44 is expressed by the oviduct epithelial cells during spontaneous oestrus, and is particularly abundant in the sperm reservoir before ovulation. Presence of spermatozoa in this segment seemed to downregulate the receptor. The variation in the expression of CD44 in relation to spontaneous ovulation and the presence of spermatozoa indicate that the hyaluronan CD44-signalling pathway may play a role in oviduct function during sperm storage and

  7. 口腔念珠菌白斑中CD44H、CD44v3和CD44v6的异常表达%Aberrant CD44H,-v3 and -v6 expression in oral candidal leukoplakia

    Institute of Scientific and Technical Information of China (English)

    周静萍; 罗海燕; 高岩

    2000-01-01

    目的研究口腔念珠菌白斑(oral candidal leukoplakia,OCL)上皮中CD44H、CD44v3和CD44v6的表达特点及其与炎症、癌变的关系.方法用免疫组织化学方法对29例OCL上皮中CD44H、CD44v3和CD44v6的表达进行研究.结果 OCL单纯增生、轻度异常增生上皮有CD44H、CD44v3和CD44v6的强阳性表达;重度异常增生上皮全部出现低表达,与对照组非白念白斑一致;形成微脓肿或炎症密集区的上皮出现低表达.结论口腔念珠菌白斑伴上皮重度异常增生者CD44H、CD44v3及CD44v6表达下降,可能与癌变有关;炎症明显区域CD44H、CD44v3及CD44v6出现低表达及细胞间粘附力下降.

  8. The CD44(high tumorigenic subsets in lung cancer biospecimens are enriched for low miR-34a expression.

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    Saroj K Basak

    Full Text Available Cellular heterogeneity is an integral part of cancer development and progression. Progression can be associated with emergence of cells that exhibit high phenotypic plasticity (including "de-differentiation" to primitive developmental states, and aggressive behavioral properties (including high tumorigenic potentials. We observed that many biomarkers that are used to identify Cancer Stem Cells (CSC can label cell subsets in an advanced clinical stage of lung cancer (malignant pleural effusions, or MPE. Thus, CSC-biomarkers may be useful for live sorting functionally distinct cell subsets from individual tumors, which may enable investigators to hone in on the molecular basis for functional heterogeneity. We demonstrate that the CD44(hi (CD44-high cancer cell subsets display higher clonal, colony forming potential than CD44(lo cells (n=3 and are also tumorigenic (n=2/2 when transplanted in mouse xenograft model. The CD44(hi subsets express different levels of embryonal (de-differentiation markers or chromatin regulators. In archived lung cancer tissues, ALDH markers co-localize more with CD44 in squamous cell carcinoma (n=5/7 than Adeno Carcinoma (n=1/12. MPE cancer cells and a lung cancer cell line (NCI-H-2122 exhibit chromosomal abnormalities and 1p36 deletion (n=3/3. Since miR-34a maps to the 1p36 deletion site, low miR-34a expression levels were detected in these cells. The colony forming efficiency of CD44(hi cells, characteristic property of CSC, can be inhibited by mir-34a replacement in these samples. In addition the highly tumorigenic CD44(hi cells are enriched for cells in the G2 phase of cell cycle.

  9. 肿瘤干细胞标记CD44和CD133在鼻咽癌细胞株中的表达检测%Expression of tumor stem cell marker CD44 and CD133 in human nasopharyngeal carcinoma cell line

    Institute of Scientific and Technical Information of China (English)

    苏进; 黄乔; 许新华; 鲁明骞; 易芳

    2011-01-01

    Objective To evaluate the expression of the tumor stem cell( TSC ) marker CD44 and CD133 in human nasopharyngeal carcinoma ( NPC ) SUNE - 1 5 - 8F cell line. Methods Immunocytochemistry and flow cytometry were used to assess the expression of CD44 and CD133 in SUNE - 1 5 - 8F cells. Fluorescence - activated cell sorting ( FACS ) was applied for purification of CD44 + cells. Results Immunofluorescence analysis revealed that CD44 was expressed on some of SUNE - 1 5 - 8F cells. CD44 positive cells accounted for 42. 4% ~ 52. 5% of the total cells. The purities of CD44+ and CD44 - cells after sorting were 98. 3% and 97.9% , respectively. Conclusion SUNE - 1 5 - 8F cell line with high expression of TSC marker is suitahle for study of NPC TSC. FACS is effective in cell sorting.%目的 探索肿瘤干细胞标记物CD44和CD133在鼻咽癌(NPC)中的表达量及其有效分选方式.方法 常规培养SUNE-1 5-8F细胞,采用免疫荧光技术及流式细胞学技术检测SUNE-1 5-8F细胞中CD44、CD133的表达,并用流式细胞仪分选CD44+、CD44+CD133+细胞.结果 激光共聚焦镜下鼻咽癌SUNE-1 5-8F细胞株细胞膜上可以观察到CD44分布;流式细胞学技术检测SUNE-1 5-8F中CD44+其表达率为42.4%~52.5%,经流式细胞仪分选得到的CD44+和CD44-细胞,其纯度分别达98.3%和97.9%.流式细胞仪检测到CD44+CD133+细胞(P2)在SUNE-1 5-8F细胞株中的表达约为3.1%.结论 SUNE-1 5-8F细胞株中肿瘤干细胞标记含量较高,适合鼻咽癌干细胞的研究,且流式细胞学技术不失为一种有效的分选细胞手段.

  10. CD44 expression in endothelial colony-forming cells regulates neurovascular trophic effect

    Science.gov (United States)

    Sakimoto, Susumu; Marchetti, Valentina; Aguilar, Edith; Lee, Kelsey; Usui, Yoshihiko; Bucher, Felicitas; Trombley, Jennifer K.; Fallon, Regis; Wagey, Ravenska; Peters, Carrie; Scheppke, Elizabeth L.; Westenskow, Peter D.

    2017-01-01

    Vascular abnormalities are a common component of eye diseases that often lead to vision loss. Vaso-obliteration is associated with inherited retinal degenerations, since photoreceptor atrophy lowers local metabolic demands and vascular support to those regions is no longer required. Given the degree of neurovascular crosstalk in the retina, it may be possible to use one cell type to rescue another cell type in the face of severe stress, such as hypoxia or genetically encoded cell-specific degenerations. Here, we show that intravitreally injected human endothelial colony-forming cells (ECFCs) that can be isolated and differentiated from cord blood in xeno-free media collect in the vitreous cavity and rescue vaso-obliteration and neurodegeneration in animal models of retinal disease. Furthermore, we determined that a subset of the ECFCs was more effective at anatomically and functionally preventing retinopathy; these cells expressed high levels of CD44, the hyaluronic acid receptor, and IGFBPs (insulin-like growth factor–binding proteins). Injection of cultured media from ECFCs or only recombinant human IGFBPs also rescued the ischemia phenotype. These results help us to understand the mechanism of ECFC-based therapies for ischemic insults and retinal neurodegenerative diseases. PMID:28138561

  11. Relationship between the Expression of CD44v6 and Development, Progress, Invasion and Metastasis of Laryngeal Carcinoma

    Institute of Scientific and Technical Information of China (English)

    LIU Banghua; KONG Weijia; GONG Shusheng; YANG Chengzhang; WANG Guangping; ZHU Lixin

    2005-01-01

    Summary: The expression of CD44v6 and its relationship with the development, progress, invasion and metastasis of laryngeal carcinoma was investigated. The expression and content of CD44v6 mRNA in tissuess were detected by both RT-PCR and FCM which were respectively extracted from normal laryngeal mucosa, leukoplakia of larynx, laryngeal papilloma, polyp of vocal cord, tissues of laryngeal carcinoma, metastatic and nonmetastatic lymph nodes of neck, and tissues close to carcinoma. The outcome of RT-PCR indicated that the expression rate of CD44v6 mRNA involved in tissues of laryngeal carcinoma and metastatic lymph nodes of neck was the highest (90 %-100 %) compared with that of leukoplakia of larynx, laryngeal papilloma, tissues close to carcinoma by 0.5 cm (55.56 %-60.00 %) and that of normal laryngeal mucosa, polyp of vocal cord, nonmetastatic lymph nodes and tissues close to carcinoma by 1.0 cm was the lowest ( 13.33 %-20 %). The result from FCM was highly consistent with that from RT-PCR. It was suggested that CD44v6 was closely related with the development, progress, invasion and metastasis of laryngeal carcinoma. The outcome from the tissues close to carcinoma by different distance could do help to the determination of incisal edge in surgery abstractly.

  12. Loss of CD44dim Expression from Early Progenitor Cells Marks T-Cell Lineage Commitment in the Human Thymus

    Science.gov (United States)

    Canté-Barrett, Kirsten; Mendes, Rui D.; Li, Yunlei; Vroegindeweij, Eric; Pike-Overzet, Karin; Wabeke, Tamara; Langerak, Anton W.; Pieters, Rob; Staal, Frank J. T.; Meijerink, Jules P. P.

    2017-01-01

    Human T-cell development is less well studied than its murine counterpart due to the lack of genetic tools and the difficulty of obtaining cells and tissues. Here, we report the transcriptional landscape of 11 immature, consecutive human T-cell developmental stages. The changes in gene expression of cultured stem cells on OP9-DL1 match those of ex vivo isolated murine and human thymocytes. These analyses led us to define evolutionary conserved gene signatures that represent pre- and post-αβ T-cell commitment stages. We found that loss of dim expression of CD44 marks human T-cell commitment in early CD7+CD5+CD45dim cells, before the acquisition of CD1a surface expression. The CD44−CD1a− post-committed thymocytes have initiated in frame T-cell receptor rearrangements that are accompanied by loss of capacity to differentiate toward myeloid, B- and NK-lineages, unlike uncommitted CD44dimCD1a− thymocytes. Therefore, loss of CD44 represents a previously unrecognized human thymocyte stage that defines the earliest committed T-cell population in the thymus. PMID:28163708

  13. Expression of COX-2, CD44v6 and CD147 and relationship with invasion and lymph node metastasis in hypopharyngeal squamous cell carcinoma.

    Directory of Open Access Journals (Sweden)

    Qing Yang

    Full Text Available To assess the expression of COX-2,CD44v6 and CD147 in hypopharyngeal squamous cell carcinomas and the three biomarkers correlation with tumor invasion and lymph node metastasis of Chinese people. 101 cases of surgically excised primary tumor were included in this study, and 40 tissues of epithelium adjacent to carcinoma were used as controls. We characterized the immunohistochemical expression of COX-2, CD44v6, and CD147 in 141 formalin-fixed, paraffin-embedded tissues, and measured the mean optical density (OD of the positive area to identify the expression of the three bio-markers and relationship with tumor invasion and lymph node metastasis. Our study demonstrates that the expression of the COX-2 and CD147 were significantly increased in carcinoma tissues compared to the epithelium adjacent to carcinoma. We also observed that the expression of COX-2, CD44v6, and CD147 were significantly associated with T classification, lymph node metastasis and clinical stage. There was strong significant correlation among the three biomarkers as well. Additionally, we indicated that recurrence and ≥ P50 level of COX-2 expression had an independent prognostic effect on prognosis. In conclusion, the three biomarkers play important roles in tumor invasion and lymph node metastases and might be valuable indicators of tumor metastasis in hypopharyngeal squamous cell carcinoma.

  14. The Expression and Significance of CD44v6 and HCG in Endometrial Cancer%CD44v6和 HCG 在子宫内膜癌中的表达及意义

    Institute of Scientific and Technical Information of China (English)

    柴光兰; 张燕华; 张铭艳

    2012-01-01

      目的检测 HCG 和 CD44v6在正常子宫内膜、子宫内膜不典型增生和不同分化程度子宫内膜癌组织中表达的不同,探讨 HCG 和 CD44v6与子宫内膜癌发生、发展的关系.方法采用免疫组织化学 SP 法,检测正常子宫内膜30例、子宫内膜不典型增生30例、不同分化程度子宫内膜癌38例中 HCG 和 CD44v6的表达.结果 CD44v6在正常子宫内膜组织、子宫内膜不典型增生、子宫内膜癌组织中的阳性表达分别为28.57%,58.33%,88.89%,三者比较差异有显著性;HCG 阳性表达分别为35.71%,66.67%,91.67%,三者比较差异亦有显著性(P <0.05).结论 CD44v6和 HCG 在正常子宫内膜、子宫内膜不典型增生及子宫内膜癌组织中的表达不同,可作为良性增生和子宫内膜癌鉴别的参考指标.%  Objective To detect the expression of CD44v6 and human chorionic gonadotrophin (HCG) in normal endometrium, endometrial atypical hyperplasia and endometrial carcinoma and investigate the development and prognosis of HCG and CD 44v6 in endome-tria1 carcinoma.Methods Expression of HCG and CD44v6 was assayed by immunohistochemistry in 30 cases with normal endometrium ,30 cases with endometrial atypical hyperplasia and 38 cases with endometrial carcinoma .Gold immunoelectron microscopy technique was used to detect espression of HCG and CD44v6 protein in endometrial carcinoma .Results The expression quantity of CD44v6 in normal endometri-um,endometrial atypical hyperplasia and cancer tissues were 28.57%,58.33%,88.89% respectively(P <0.05).The expression quantity of HCG were 35.71%,66.67%,91.67% respectively(P <0.05).Conclusion The immunohistochemical analysis show a trend toward in -creased HCG and CD44v6 expression in endometrial carcinoma and endometrial atypical hyperplasia compared to normal endometrium .HCG and CD44v6 may play an important role in tumor production of endometrial carcinoma .

  15. The expression and correlation of Rab5A and CD44v9 in breast cancer tissues%Rab5A与CD44v9在乳腺癌组织中的表达及其相关性

    Institute of Scientific and Technical Information of China (English)

    谷新悦; 查尼尔; 张明; 李志高

    2012-01-01

    目的 研究乳腺癌组织中Rab5A与CD44v9蛋白的表达及其相关性.方法 应用免疫组织化学S-P法检测53例术后乳腺癌标本、21例乳腺良性肿瘤标本中Rab5A与CD44v9蛋白的表达情况.结果 Rab5A与CD44v9蛋白在乳腺癌组的表达率显著高于良性肿瘤组(P<0.05);Rab5A和CD44v9蛋白在有淋巴结转移的乳腺癌组中的表达率显著高于无淋巴结转移组(P<0.05),并且二者的表达水平均与淋巴结状态相关,二者的表达水平增高,则发生淋巴结转移的概率增加(P<0.05);Rab5A和CD44v9蛋白的表达程度与乳腺癌TNM分期呈正相关,分期越晚表达越强(P<0.05);乳腺癌组织中,Rab5A与CD44v9蛋白的表达呈正相关(P<0.05).结论 Rab5A和CD44v9蛋白在乳腺癌的发生发展、侵袭转移中可能起到协同作用.两者联合检测对于早期诊断乳腺癌及判断其预后有重要的临床意义.%Objective To evaluate the expression and correlation of Rab5A and CD44v9 in breast cancer tissues. Methods The expression of Rab5A and CD44v9 in 53 cases of breast cancer tissues and 21 cases of benign breast disease tissues was detected by immunohistochemistry S - P method. Results The expressions of Rab5A and CD44v9 were obviously stronger in breast cancer tissues than that in benign breast disease tissues( P <0.05 );the expression of Rab5A and CD44v9 were obviously stronger in lymph node - positive cases than that in negative cases( P < 0. 05 ), and were correlated with lymph - node status. With the two proteins expressed at higher levels,the probability of node - positive cases was enhanced( P <0. 05 ). Moreover, the expressions of the two proteins were positive correlation to TNM stage( P < 0. 05 ). In addition, the expressions of the two proteins were positive correlation to each other, the higher levels of either protein was expressed at the higher levels of the other( P <0. 05 ). Conclusions Rab5A and CD44v9 proteins may play a synergetic role in breast

  16. Expression of CCR7, L-selectin, CD44v6 and MMP9 in colorectal cancer and their relative with lymphatic metastatic%大肠癌中CCR7、L-selectin、CD44v6和MMP9表达及其与淋巴转移的关系

    Institute of Scientific and Technical Information of China (English)

    武欣; 李坤; 张凡; 刘军超; 林媛媛; 金春亭

    2013-01-01

    目的 探讨CC趋化因子受体7(CCR7)、L-selectin、CD44v6和MMP9在大肠癌组织中的表达及其与大肠癌淋巴转移的关系.方法 采用免疫组化PV 9000两步法检测104例大肠癌组织(大肠癌组)、55例癌旁正常组织(癌旁组)和34例转移灶组织(转移组)中CCR7和L-selectin、CD44v6和MMP9的表达.结果 大肠癌组、转移组中CCR7、L-selectin、CD44v6和MMP9阳性率明显高于癌旁组(P<0.05),有淋巴结转移者明显高于无转移者(P<0.05);CCR7与L-selectin、MMP9表达呈正相关(P<0.05);CD44v6与L-selectin、MMP9表达相关;L-selectin与MMP9的表达呈正相关.结论 CCR7、L-selectin、CD44v6和MMP9在大肠癌中的表达与大肠癌的发生、淋巴转移有关,它们可能共同参与了大肠癌发生及淋巴结转移过程.%Purpose To investigate the expression of chemokine receptor 7 ( CCR7 ), adhesion molecule L-selectin, CD44v6 and MMP9 in human colorectal carcinoma, and analyze their correlation with lymph node metastasis. Methods The expression of CCR7, L-selectin, CD44v6 and MMP9 were tested by immunohistochemical method in 104 cases of colorectal carcinoma specimens ( colorectal carcinoma group ), 55 cases of normal intestinal mucosa adjacent to carcinoma ( adjacent group ) and 34 cases of metastatic tumor tissue ( metastasis group). Results The positive rate of CCR7, L-selectin, CD44v6 and MMP9 expression in the colorectal carcinoma group and metastatic tumor tissue were significantly higher than that in adjacent group and metastasis group ( P < 0. 05 ). The expression of CCR7, L-selectin, CD44v6 and MMP9 in the tissue with lymph node metastasis was significantly higher than that in the tissue without lymph node metastasis ( P <0. 05 ). There was significantly positive correlation between expression of CCR7 and L-selectin, CCR7 and MMP9, CD44v6 and L-selectin, CD44v6 and MMP9, L-selectin and MMP9 ( P < 0. 05 ). Conclusions The expression of CCR7, L-selectin, CD44v6 and MMP9 are closely

  17. CD44v6修饰DC融合瘤苗体外抗结肠癌作用的研究%The Anticolon-cancer Research of Fusion Hybrid of Dendritic Cells Expressing CD44v6 in Vitro

    Institute of Scientific and Technical Information of China (English)

    赵光艳; 胡显芳; 李彦

    2013-01-01

    Objective To survey the antitumor mechanism and effect of fusion hybrid cells of DCs and colon cancer cell CT26.WT co-cultivating and expressing CD44v6 gene, DCs and colon cancer cell CT26.WT derived from mice were blended, and modified with CD44v6 gene, it will provide the experimental foundation on the prevention and immunotherapy for tumor patients. Methods①CT26.WT cells and DCs were blended by polyethylene glycal, and the fused cells were screened by HAT/HT system. The recombinant pBud-CD44v6 vector was transfected into the fused cells by lipofectamine, and to express;②The anticancer effect and cytotoxicty of fused–cell vaccine were studied in vitro. Result DC/CT26.WT fused cell vaccine modified with CD44v6 geng was constructed;the lymphocyte cytotoxicity T(CTL) of immune group was larger activity than that of the anainst group .Conclusion The fused cells of DC expressing CD44v6 geng can induce strong anticolon-cancer activity of T lymphocyte.%  目的小鼠提取的树突状细胞(DC)和小鼠结肠癌细胞CT26.WT共培养、融合,CD44v6基因来修饰融合细胞,研究CD44v6修饰DC融合瘤苗体外抗结肠癌的作用机制,为肿瘤预防及免疫治疗提供实验依据。方法①在聚乙二醇的作用下,DC细胞和CT26.WT细胞共培养、融合,利用HAT/HT筛选系统筛选出纯净DC融合细胞。在脂质体的作用下,将pBud-CD44v6转染到DC融合细胞中表达;②体外实验观察DC融合瘤苗对小鼠结肠癌细胞的杀灭作用。结果构建了基因CD44v6修饰的DC/CT26.WT肿瘤融合疫苗;实验组细胞的淋巴细胞毒(CTL)活性明显高于对照组。结论 CD44v6修饰的DC融合瘤苗可有效诱导T淋巴细胞产生强大抗结肠癌作用。

  18. Over expression of hyaluronan promotes progression of HCC via CD44-mediated pyruvate kinase M2 nuclear translocation

    Science.gov (United States)

    Li, Jing-Huan; Wang, Ying-Cong; Qin, Cheng-Dong; Yao, Rong-Rong; Zhang, Rui; Wang, Yan; Xie, Xiao-Ying; Zhang, Lan; Wang, Yan-Hong; Ren, Zheng-Gang

    2016-01-01

    Hyaluronan is expressed in hepatocellular carcinoma (HCC) as HCC generally arises from a cirrhotic liver in which excessive production and accumulation of HA leads to developing cirrhosis. Though it has been suggested HA is involved in progression of HCC, the mechanisms underlying the connection between HA and HCC progression are unclear. Since increased aerobic glycolysis is a metabolic trait of malignant cells and HA-CD44 can modulate glucose metabolism, we aim to investigate the roles of PKM2, a key enzyme in glucose metabolism, in the HA-CD44 axis facilitated the progress of HCC. We shown PKM2 was required for HA-promoted HCC progression, which was not modulated by PKM2 kinase activity but by nuclear translocation of PKM2. PKM2 translocation was Erk (Thr202/Tyr204) phosphorylation dependent, which functioned at the downstream of HA-CD44 binding. Furthermore, elevated HA expression significantly correlated with PKM2 nuclear location and was an independent factors predicting poor HCC prognosis. In conclusions PKM2 nuclear translocation is required for mediating the described HA biological effects on HCC progression and our results imply that inhibition of HA may have therapeutic value in treating HCC. PMID:27186420

  19. 粘附分子CD62P和CD44在毛细支气管炎患儿外周血中的表达及意义%Expression and significance of adhesion molecules CD62P and CD44 in peripheral blood of infants with bronchiolitis

    Institute of Scientific and Technical Information of China (English)

    邹丽萍; 王伟; 张艳丽; 张艳; 王莉

    2015-01-01

    bronchiolitis group in the acute phase, there was a positive correlation between CD62P expression and serum CD44 level (r=0.91;P<0.05).ConclusionsThe adhesion molecules CD62P and CD44 play an important role in the pathogenesis of bronchiolitis, and their levels can relfect the severity of inlfammatory response in infants with bronchiolitis.

  20. Acceleration of lung metastasis by up-regulation of CD44 expression in osteosarcoma-derived cell transplanted mice.

    Science.gov (United States)

    Shiratori, H; Koshino, T; Uesugi, M; Nitto, H; Saito, T

    2001-09-20

    The effect of CD44-phenotypic expression on metastasis to the lung was studied using a spontaneous murine osteosarcoma-derived cell line, POS-1, stimulated with lipopolysaccharide (LPS). POS-1 cells were inoculated into the hind paws of 20 C3H/HeJ mice and produced a visible mass in all mice in 5 weeks, and these transplanted tumors resulted in lung metastasis in all mice. The number of metastatic foci in the lungs was 12.0+/-2.1 (mean+/-SD) with LPS-stimulated cells, which was significantly higher than that of unstimulated cells (5.8+/-1.4; N=10 for each; P<0.05). Hyaluronate (HA), a ligand of CD44, inhibited a number of lung metastases in a dose-dependent manner (0.5% HA, 3.0+/-1.1; 0.005% HA, 5.1+/-1.5; without HA, 8.6+/-1.7; N=10 for each; P<0.05, each group with HA versus the group without HA). Adhesion assay by coculturing POS-1 cells and lung microvascular endothelial cells on culture plate showed that the adhesion was significantly lower in HA treated POS-1 than those without HA (1.18+/-0.12 and 2.74+/-0.17, respectively, P<0.05). These results suggest that lung metastasis was accelerated by up-regulation of CD44.

  1. The study on quantitative expression of CD44v6mRNA by real-time RT-PCR with the micro-metastases of gastric cancer

    Institute of Scientific and Technical Information of China (English)

    Daorong Wang; Xunliang Liu; Guoyu Chen; Yi Miao; Jianguo Xia

    2005-01-01

    Objective: To study the expression of CD44 correlation and the ability of metastasis of tumor cells in gastric carcinoma, and to find the correlation of the quantitative of CD44V6mRNA and the histology expression of CD44v6 in tumors with the clinic-pathologic features, and to make the quantitative expression of CD44v6mRNA. Methods: Twenty patients with gastric carcinoma, 4patients with gastritis, and 10 apparently healthy controls were recruited. Blood samples were obtained before surgery. 10 days after surgery, the blood samples were obtained again. Serum CD44v6mRNA in all cases was measured by real-time quantitative PCR. Results:Serum CD44V6mRNA was detectable in 20 of 20( 100% ) gastric carcinoma cases, The expression level ranged from 4.9 × 102 copies/μg RNA to 3.2 × 10s copies/μg RNA, the average levels of peripheral blood was 3.9 × 104 copies/μg RNA, The expression level of peripheral blood of gastric cancer after curative operation ranged from 5.5 × 100 copies/μg RNA to 7.6 × 103 copies/μg RNA. After curative operation the expression level was decreased markedly. Conclusion: Serum CD44v6mRNA is expressed in the peripheral blood of gastric carcinoma patients. The expression level of CD44V6mRNA is obviously decreased after curative operation. An elevated level of CD44v6mRNA may serve as an indicator of lymph node metastasis (especially early metastasis) and bad prognosis in patients with gastric carcinoma.

  2. Expression and its Clinical Significance of P53, CD44 and EGFR in Non-small Cell Lung Cancer%P53、CD44及表皮生长因子受体在非小细胞肺癌中的表达及临床意义

    Institute of Scientific and Technical Information of China (English)

    温景芸; 林曲; 董敏; 陈洁; 陈展洪; 吴祥元

    2011-01-01

    Objective To observe the expression and its clinical significance of P53, CD44 and EGFR in non-small cell lung cancer (NSCLC). Methods Expression of P53, CD44 and EGFR was delected by immunohistochemistry in 87 NSCLC tissues, and their relationship was analyzed. Results The positive rate of P53, CD44 and EGFR was 49.4%, 60.9% and 67.8%, respectively, in NSCLC tissues. The positive rate of P53 with stage Ⅲ-Ⅳ was lower than that with stage Ⅰ-Ⅱ (40.3% vs. 66.7%, P<0.05). The positive rate of CD44 was higher in lung squamous cell carcinoma than that in lung adenocarcinoma (82.8% vs. 49.1 %, P<0.01). The positive rate of EGFR was higher with lymph node metastasis than that without lymph node metastasis (74.6% vs. 53.6%, P<0.05). Conclusion The joint detection of P53, CD44 and EGFR is helpful for predicting the potential metastasis and targeted chemotherapy of NSCLC.%目的 探讨P53、CD44及表皮生长因子受体(EGFR)在非小细胞肺癌中的表达及临床意义.方法 收集某医院2007年1月-2009年6月经手术切除及穿刺活检病理确诊,且随访资料完整的非小细胞肺癌患者87例,利用免疫组织化学技术检测其标本中P53、CD44及EGFR的表达.结果 P53、CD44及EGFR在87例NSCLC中的表达阳性率分别为49.4%,60.9%及67.8%.Ⅲ~Ⅳ期P53表达低于Ⅰ~Ⅱ期(40.3% vs.66.7%,P=0.036);鳞癌患者CD44表达较腺癌高(82.8%vs.49.1%,P=0.003);淋巴结转移的患者EGFR表达较无淋巴结转移高(74.6% vs.53.6%,P=0.023).P53与CD44正相关(P=0.035).结论 联合检测P53、CD44及EGFR在非小细胞肺癌中的表达对于判断预后和指导治疗可能具有实用价值.

  3. Activation of c-Met and upregulation of CD44 expression are associated with the metastatic phenotype in the colorectal cancer liver metastasis model.

    Directory of Open Access Journals (Sweden)

    Victoria A Elliott

    Full Text Available BACKGROUND: Liver metastasis is the most common cause of death in patients with colorectal cancer. Despite extensive research into the biology of cancer progression, the molecular mechanisms that drive colorectal cancer metastasis are not well characterized. METHODS: HT29 LM1, HT29 LM2, HT29 LM3 cell lines were derived from the human colorectal cancer cell line HT29 following multiple rounds of in vivo selection in immunodeficient mice. RESULTS: CD44 expression, a transmembrane glycoprotein involved in cell-cell and cell-matrix adhesions, and cancer cells adhesion to endothelial cells was increased in all in vivo selected cell lines, with maximum CD44 expression and cancer cells adhesion to endothelial cells in the highly metastatic HT29 LM3 cell line. Activation of c-Met upon hepatocyte growth factor (HGF stimulation in the in vivo selected cell lines is CD44 independent. In vitro separation of CD44 high and low expression cells from HT29 LM3 cell line with FACS sorting confirmed that c-Met activation is CD44 independent upon hepatocyte growth factor stimulation. Furthermore, in vivo evaluation of CD44 low and high expressing HT29 LM3 cells demonstrated no difference in liver metastasis penetrance. CONCLUSIONS: Taken together, our findings indicate that the aggressive metastatic phenotype of in vivo selected cell lines is associated with overexpression of CD44 and activation of c-MET. We demonstrate that c-Met activation is CD44 independent upon hepatocyte growth factor stimulation and confirm that CD44 expression in HT29 LM3 cell line is not responsible for the increase in metastatic penetrance in HT29 LM3 cell line.

  4. In vitro and in vivo prostate cancer metastasis and chemoresistance can be modulated by expression of either CD44 or CD147.

    Directory of Open Access Journals (Sweden)

    Jingli Hao

    Full Text Available CD44 and CD147 are associated with cancer metastasis and progression. Our purpose in the study was to investigate the effects of down-regulation of CD44 or CD147 on the metastatic ability of prostate cancer (CaP cells, their docetaxel (DTX responsiveness and potential mechanisms involved in vitro and in vivo. CD44 and CD147 were knocked down (KD in PC-3M-luc CaP cells using short hairpin RNA (shRNA. Expression of CD44, CD147, MRP2 (multi-drug resistance protein-2 and MCT4 (monocarboxylate tranporter-4 was evaluated using immunofluorescence and Western blotting. The DTX dose-response and proliferation was measured by MTT and colony assays, respectively. The invasive potential was assessed using a matrigel chamber assay. Signal transduction proteins in PI3K/Akt and MAPK/Erk pathways were assessed by Western blotting. An in vivo subcutaneous (s.c. xenograft model was established to assess CaP tumorigenecity, lymph node metastases and DTX response. Our results indicated that KD of CD44 or CD147 decreased MCT4 and MRP2 expression, reduced CaP proliferation and invasive potential and enhanced DTX sensitivity; and KD of CD44 or CD147 down-regulated p-Akt and p-Erk, the main signal modulators associated with cell growth and survival. In vivo, CD44 or CD147-KD PC-3M-luc xenografts displayed suppressed tumor growth with increased DTX responsiveness compared to control xenografts. Both CD44 and CD147 enhance metastatic capacity and chemoresistance of CaP cells, potentially mediated by activation of the PI3K and MAPK pathways. Selective targeting of CD44/CD147 alone or combined with DTX may limit CaP metastasis and increase chemosensitivity, with promise for future CaP treatment.

  5. Nanog与CD44在胃癌细胞株MKN45球体细胞中的表达及其意义%The expression and significance of Nanog and CD44 in spheroid body-forming cells of gastric cancer cell line MKN-45

    Institute of Scientific and Technical Information of China (English)

    刘建明; 周友浪; 马利林; 徐骏飞; 章建国

    2015-01-01

    -free medium, and the levels of Nanog and CD44 mRNA expression in spheroid body-forming cells were 2.34 ± 0.22 and 1.18 ± 0.04,respectively, which were higher than those in parental cells (1.00±0.00 and 1.00±0.05). The levels of Nanog and CD44 protein expression in spheroid body-forming cells were 0.18±0.02 and 0.24±0.04, respectively, which were significantly higher than those in pa⁃rental cells (0.07±0.02 and 0.18±0.01, P<0.05). Nanog protein was positively stained within the perinuclear and cytoplasm of the spheroid body-forming cells, and CD44 was positively stained mainly in the membrane. Dual staining of Nanog/CD44 indicated that the embryonal protein Nanog was co-localized with CD44 in the spheroid body-forming cells. Conclusion Spheroid body-forming cells developed from human gastric cancer cell line MKN-45 in serum-free medium supplemented with EGF and bFGF show characteristics of cancer stem cell (CSC). The cells co-expressed of CD44 and Nanog maybe a phe⁃notype of gastric CSCs.

  6. The expression and clinical significance of KAI1 and CD44v6 protein in human osteosarcoma%KAI1和CD44v6蛋白在骨肉瘤组织中的表达及临床意义

    Institute of Scientific and Technical Information of China (English)

    Weihua Hu; Anmin Chen; Fengiing Guo; Feng Li

    2009-01-01

    Objective: To investigate the expressions of KAI1 and CD44v6 in human osteosarcoma and the relationship between expressions of them and their clinic pathological features and prognosis. Methods: The expressions of KAI1 and CD44v6 in 87 samples with osteosarcema were detected by S-P immunohistochemistry. Results: Expression of KAI1 had correlation with metastasis of osteosarcoma, and was strongly associated with differentiation of tumor cells. The expression of CD44v6 in osteosarcoma had correlation with metastasis. There was no difference between the expression of KAI1 and CD44v6. Cox model analysis showed that the prognostic factors were KAI1 expression, metastasis and Enneking surgical staging system. Conclusion: The abnormal expression of KAI1 and CD44v6 participate metastasis of osteosarcoma, KAI1 expression, metastasis and Enneking surgical staging system can be used to independently predict the prognosis of osteo-sarcoma patients.

  7. NIBP impacts on the expression of E-cadherin, CD44 and vimentin in colon cancer via the NF-κB pathway.

    Science.gov (United States)

    Xu, Chun-Yan; Qin, Meng-Bin; Tan, Lin; Liu, Shi-Quan; Huang, Jie-An

    2016-06-01

    NIBP, a novel nuclear factor-κB (NF-κB)-inducing kinase (NIK) and IκB kinase β (IKKβ) binding protein, directly interacts with NIK and IKKβ, and acts as the 'bridge' of the NF‑κB classical and alternative signaling pathways. However, its influence on epithelial‑mesenchymal transition markers in colon cancer remains to be fully elucidated. The aim of the present study was to investigate the roles of NIBP impacting on the expression of E‑cadherin, CD44 and vimentin. In the present study, the associations between NIBP and E‑cadherin, CD44 and vimentin in clinical samples were analyzed by making pairwise comparisons between normal colon tissue, non‑metastatic colon cancer tissue and metastatic colon cancer tissue. In in vitro experiments, after changing the expression of NIBP in cells, the protein expression levels of CD44, vimentin, E‑cadherin were analyzed by western blot analysis. The results revealed that the protein expression levels of NIBP, CD44 and vimentin were markedly increased, and E‑cadherin was markedly decreased, in metastatic colon cancer tissue compared with normal colon tissue and non‑metastatic colon cancer tissue. Upregulation of NIBP expression decreased the levels of E‑cadherin, whereas the downregulation of NIBP increased E‑cadherin levels, while no significant differences were observed in the levels of CD44 and vimentin. In addition, cells that were treated with the NF‑κB inhibitor, pyrrolidine dithiocarbamate (PDTC), also tended to exhibit increased levels of CD44 and vimentin expression in the NIBP upregulated expression group (29‑NIBP group) compared with the mock group, whereas the expression levels of E‑cadherin, CD44 and vimentin were similar in the NIBP downregulated expression group (116‑NIBPmir group) and the HCT116 blank control group (116‑mock group) on treatment of the cells with tumor necrosis factor‑α. These findings indicated that NIBP, E‑cadherin, CD44 and vimentin are possibly

  8. Expression of CD44 in Liver Tissues of Rats with Severe Acute Pancreatitis and Protective Effect of Qingyi Ⅱ Granules%CD44在重症急性胰腺炎大鼠肝脏表达及清胰Ⅱ号颗粒剂保护作用的实验研究

    Institute of Scientific and Technical Information of China (English)

    李鹏; 王玲君; 兑丹华

    2011-01-01

    Objective: To explore the role of CD44 in pancreas and liver damage in severe acute pan-creastitis (SAP) , and to investigate the effects of Chinese medicine Qingyi Ⅱ granules on the expression of CD44 and its mechanism. Methods: A total of 36 healthy SD rats were randomly divided into three groups: sham-operated group ( group A) , SAP model group (group B) and treatment group ( group C). SAP model was established by retrograde injection of 30 g/L sodium taurocholate into bile-pancreas duct. Qingyi Ⅱ Granules 250 g/L was administered by gavage every 6 hours in group C . While the other two groups were infused with same volume of saline instead. All animals were sacrificed after modeling for 24 h. The CD44 expressions in pancreas and liver tissues were detected with immunohistochemistry method. Serum amylase (AMY) , aspartate aminotransferasea (AST) and ala-nine aminotransferase (ALT) were tested. Pathologic changes of pancreas and liver tissues were observed under microscope. Results: Pancreas and liver tissues were damaged seriously in group B, and the expression of CD44 was positive, the serum levels of AMY, AST and ALT were significantly higher than those of groups A and C ( P<0.05 ). The expression level of CD44 was lower and activities of serum AMY, AST and ALT were higher significantly in group C than those in group B. (P<0. 05). Conclusions: The expression of CD44 may play an important role in pancreas and liver injury in SAP rats. Chinese medicine Qingyi II granules could depress the expressions of CD44 in pancreas and liver tissues, and alleviate the pathologic damage of pancreas and liver in SAP rats.%目的:探讨CD44在重症急性胰腺炎(severe acute pancreastitis,SAP)时胰腺及肝损害机制中的作用,并观察中药清胰Ⅱ号颗粒剂对CD44的影响及机理.方法:将36只SD大鼠随机等分为假手术组(A组)、SAP组(B组)、治疗组(C组),各组以30 g/L牛磺胆酸钠逆行注入胰胆管制作大鼠SAP模型,A组大鼠开

  9. Effect of soluble CD44 molecule on the expression of apoptosis regulatory protein bcl-2 associated death factor bad in human trabecular meshwork cell%可溶性CD44分子对人眼小梁网细胞凋亡调节蛋白bcl-2相关死亡因子bad表达的影响

    Institute of Scientific and Technical Information of China (English)

    梁宗宝; 吴瑜瑜; 郭茂生

    2012-01-01

    亡因子bad蛋白的表达.%Background Researches demonstrated that the levels of soluble CD44 (sCD44)molecule in aqueous is significantly higher in primary open-angle glaucomous(POAG) eye than normal eye,but how the sCD44 would affect the expression of apoptosis protein in trabecular meshwork cells is below understanding. Objective The present study was to investigate the effect of sCD44 on the expression of regulatory proteins bcl-2 associated death factor bad in trabecular meshwork cells in the patients with POAG. Methods Human scleral tissue with trabecular meshwork were obtained from POAG patients during the surgery.The trabecular meshwork cells were primarily cultured by explant culture method and identified by immunochemistry.The third generation of cells were incubated with free-serum DMEM/F12 medium added differnt dosages of sCD44 (0,1,5,10,25,50 mg/L) for 48 hours.The expression of bad protein in cultured cells was detected using cell counting kit-8 (CCK-8) as the absorbance values at 490 nm(A,90 value),and the bad protein level in cultured cells was assayed by ELISA. Results The cultured cells showed the positive response for laminin ( LM ),neuron specific enolase ( NSE ),fibronectin ( FN ) monoclonal antibodies.The CCK-8 assay showed that the A490 values of the trabecular meshwork cells in 0,1,5,10,25,50 μg/L of sCD44 groups were 0.2460±0.0019,0.1874±0.0015,0.1570±0.0016,0.1302±0.0019,0.1084±0.0018,0.0940±0.0020 respectively with a statistically significant difference among the 6 groups( F =14.922,P =0.000 ),and the A490 values in various dosages of sCD44 groups were significantly lower than the 0 μg/L sCD44 group (P=0.013,0.008,0.011,0.005,0.004).The ELISA assay showed that bad protein levels in 0,1,5,10,25,50 μg/L of sCD44 groups were ( 114.8461 ± 2.9560 ),( 137.8270 ± 2.4259 ),( 161.4194 ± 3.7381 ),( 170.9453 ± 3.2006 ),( 221.2252 ±4.3738 ),( 324.6167±4.4220) ng/L,showing a total difference among them ( F =16.610,P =0.000 ),and the bad protein levels in various dosages of sCD44

  10. CD44v6、E-cadherin和ki-67蛋白质与腮腺多形性腺瘤的生物学行为相关性研究%Correlation Study between Expression of CD44v6, E-cadherin and ki-67 Protein and Biological Behaviors in Parotid Gland Pleomorphic Adenoma

    Institute of Scientific and Technical Information of China (English)

    邱雪冰; 赵瑾; 徐江

    2014-01-01

    To explore the correlation between expression of CD44v6, E-cadherin,ki-67 protein and biological behavior of parotid gland pleomorphic adenoma. Immunohistochemical SP dyeing method was applied to detect CD44v6,E-cadherin and Ki-67 protein expression in pleomorphic adenoma,non-tumor tissue and malignant tumor of parotid gland.The results showed that the positive expression rate of CD44v6,E-cadherin and ki-67 was 100%,96% and 73.8% respectively in the parotid gland pleomorphic adenoma;There was a significant difference in the expression of E-cadherin and ki-67 in the parotid gland pleomorphic adenoma,malignant tissue and peripheral non-tutor tissue.There was correlation with invasion and metastasis of the parotid gland pleomorphic adenoma;The CD44v6 expression had statistical differences in the parotid gland pleomorphic adenoma and peripheral non-tutor tissue,malignant tissue and peripheral non-tutor tissue.It suggested that E-cadherin and ki-67 was associated with the biological behavior of the parotid gland pleomorphic adenoma,which could be used as aa new tutor marker to evaluate the prognosis.%为检测腮腺多形性腺瘤中CD44v6、E-cadherin和ki-67蛋白表达,以探讨其与腮腺多形性腺瘤生物学行为的相关性。应用免疫组织化学SP法染色检测腮腺多形性腺瘤组、多形性腺瘤恶变组和瘤旁非瘤组织组各组间CD44v6、E-cadherin和ki-67蛋白表达。结果显示,(1)CD44v6、E-cadherin和ki-67在腮腺多形性腺瘤组中的阳性表达率分别为100%、96%和73.8%;(2)E-cadherin和ki-67在腮腺多形性腺瘤组、多形性腺瘤恶变组和瘤周非瘤组织间的阳性表达率均有差异,其表达与腮腺多形性腺瘤的浸润转移有关;(3)CD44v6在腮腺多形性腺瘤组与瘤周非瘤组织组,多形性腺瘤恶变组与瘤周非瘤组织组中的表达有统计学差异。由此可知,E-cadherin和ki-67与腮腺多形性腺瘤的生物学行为有关,可作为新的肿瘤标志物,其

  11. E-CADHERIN AND CD44V6 EXPRESION IN HUMAN HEPATOCELLULAR CARCINOMAS

    Institute of Scientific and Technical Information of China (English)

    郑建明; 郑唯强; 龚志锦; 朱明华; 戴益民; 张照环

    2001-01-01

    To investigate the significance of E- cadherin (E-cad) and CD44v6 expression in human hepatocellular carcinomas (HCCs). Methods: An immunohistochemical method was used to detect E-cad and CD44v6 expression in 66 cases of HCCs. Results: The positive rates of E-cad and CD44v6 expression in human HCCs were 42.4%(28/66) and 39.4%(26/66), respectively. There was an inverse correlation between E-cad expression and invasive and metastatic potential of HCCs (P<0.01), and a positive correlation between the CD44v6 expression and invasive and metastatic potential of HCCs (P<0.01). Moreover, the 5-year survival rate in the E-cad-positive group was higher than in E-cad-negative group (P<0.01), and that in the CD44v6-positive group was lower than in the CD44v6-negative expression group (P<0.05). Conclusion: these data show a possible association between E-cad and CD44v6 expression and the potential of invasion and metastasis in HCCs. E-cad and CD44v6 expression may be used as an auxiliary prognostic indicator in HCCs.

  12. Observation the inhibitory effect and expression of MMP -2, CD44v6 of common turmeric among tumor-bearing nude mice%温郁金对荷肿瘤裸鼠抑瘤作用和MMP -2、CD44v6表达影响的观察

    Institute of Scientific and Technical Information of China (English)

    王光亮; 张俊会

    2012-01-01

    Objective To study the inhibitory effect of common turmeric and the expression of MMP - 2 and CD44v6 proteins in human gastric SGC -7901 cell, explore the possible mechanisms on gastric cancer metastasis. Method Established nude mouse orthotopic transplantation mode of SGC - 7901 and then randomly divided the nude mouse into control group and common turmeric group. The tumor growth and metastasis were observed, the expression of MMP - 2 and CD44v6 proteins in the tumor tissue were detected by immunohisto-chemistry. Results The rate of successfully orthotopic transplantation was 100%. The weight of the tumors in common turmeric group was (2.73 ±0.92) g, in control group was (4. 09 ± 1.17) g, there was statistical significance between the two group (P <0.05) , The inhibitory rate of common turmeric group was 33. 25%. The metastasis of cavitas peritonealis, liver and lymph node in common turmeric group were significantly lower than those of control group (P < 0. 05) . Meanwhile, we found that the positive rates of MMP - 2 and CD44v6 expression in the common turmeric group were obviously lower than that in control group (P<0.05) . Conclusions Common turmeric can inhibit gastric cancer growth and metastasis in orthotopic transplantation model of nude mice, the mechanism might be related to down - regulation of MMP - 2 and CD44v6 expression.%目的 观察温郁金对胃癌细胞抑制作用和MMP-2、CD44v6蛋白表达的影响,探讨其抗胃癌细胞转移的作用机制.方法 以SGC - 7901胃癌细胞株建立胃癌裸鼠原位移植瘤模型,将裸鼠随机分为对照组(0.9%氯化钠溶液)及实验组(温郁金水煎剂).观察裸小鼠胃癌种植后肿瘤生长及转移灶情况,用免疫组化法检测2组肿瘤组织中MMP-2和CD44v6蛋白的表达.结果 2组荷瘤鼠胃壁均有肿瘤生长,荷瘤率100%,对照组瘤重(4.09±1.17) g,实验组瘤重(2.73±0.92) g(与对照组比较P<0.05),抑瘤率为33.25%;实验组肝、腹腔和淋巴结转

  13. Downregulation of CD44 reduces doxorubicin resistance of CD44+CD24- breast cancer cells

    Directory of Open Access Journals (Sweden)

    Phuc PV

    2011-06-01

    Full Text Available Pham Van Phuc, Phan Lu Chinh Nhan, Truong Hai Nhung, Nguyen Thanh Tam, Nguyen Minh Hoang, Vuong Gia Tue, Duong Thanh Thuy, Phan Kim NgocLaboratory of Stem Cell Research and Application, University of Science, Vietnam National University, Ho Chi Minh, VietnamBackground: Cells within breast cancer stem cell populations have been confirmed to have a CD44+CD24- phenotype. Strong expression of CD44 plays a critical role in numerous types of human cancers. CD44 is involved in cell differentiation, adhesion, and metastasis of cancer cells.Methods: In this study, we reduced CD44 expression in CD44+CD24- breast cancer stem cells and investigated their sensitivity to an antitumor drug. The CD44+CD24- breast cancer stem cells were isolated from breast tumors; CD44 expression was downregulated with siRNAs followed by treatment with different concentrations of the antitumor drug.Results: The proliferation of CD44 downregulated CD44+CD24- breast cancer stem cells was decreased after drug treatment. We noticed treated cells were more sensitive to doxorubicin, even at low doses, compared with the control groups.Conclusions: It would appear that expression of CD44 is integral among the CD44+CD24- cell population. Reducing the expression level of CD44, combined with doxorubicin treatment, yields promising results for eradicating breast cancer stem cells in vitro. This study opens a new direction in treating breast cancer through gene therapy in conjunction with chemotherapy.Keywords: antitumor drugs, breast cancer stem cells, CD44, CD44+CD24- cells, doxorubicin

  14. CD44 expression predicts local recurrence after radiotherapy in larynx cancer.

    NARCIS (Netherlands)

    Jong, M.C.J. de; Pramana, J.; Wal, J.E. van der; Lacko, M.; Peutz-Kootstra, C.J.; Jong, J.M. de; Takes, R.P.; Kaanders, J.H.A.M.; Laan, B.F.A.M. van der; Wachters, J.; Jansen, J.C.; Rasch, C.R.; Velthuysen, M.L. van; Grenman, R.; Hoebers, F.J.; Schuuring, E.; Brekel, M.W. van den; Begg, A.C.

    2010-01-01

    PURPOSE: To find molecular markers from expression profiling data to predict recurrence of laryngeal cancer after radiotherapy. EXPERIMENTAL DESIGN: We generated gene expression data on pre-treatment biopsies from 52 larynx cancer patients. Patients developing a local recurrence were matched for T-s

  15. CD44 Expression Predicts Local Recurrence after Radiotherapy in Larynx Cancer

    NARCIS (Netherlands)

    de Jong, Monique C.; Pramana, Jimmy; van der Wal, Jacqueline E.; Lacko, Martin; Peutz-Kootstra, Carine J.; Takes, Robert P.; Kaanders, Johannes H.; van der Laan, Bernard F.; Wachters, Jasper; Jansen, Jeroen C.; Rasch, Coen R.; van Velthuysen, Marie-Louise F.; Grenman, Reidar; Hoebers, Frank J.; Schuuring, Ed; van den Brekel, Michiel W.; Begg, Adrian C.; de Jong, Johan

    2010-01-01

    Purpose: To find molecular markers from expression profiling data to predict recurrence of laryngeal cancer after radiotherapy. Experimental Design: We generated gene expression data on pre-treatment biopsies from 52 larynx cancer patients. Patients developing a local recurrence were matched for T-s

  16. 喉癌Hep-2细胞CD44+CD133+生物学特性研究%Research on the biological characteristics of CD44+CD133+of human laryngeal carcinoma Hep-2 cells

    Institute of Scientific and Technical Information of China (English)

    孔令帅; 温树信; 高伟; 王珏; 付荣; 杨丽娟; 李飞; 杨雨燕

    2016-01-01

    Objective To isolate, culture and identify laryngeal cancer stem cells from laryngeal carcinoma Hep-2 cell line and observe its biological characteristics in vitro. Methods Isolated, cultured and indentified human laryngeal carcinoma Hep-2 cells by MACS to obtain CD44+CD133+,CD44+CD133-,CD44-CD133+,CD44-CD133-four subsets of stem cells and plot-ted, the growth curves of four kinds of cells. The positive rate was detected by flow cytometry. The transwell chamber invasion assay, cell adhesion experiment and cloneformation assay were performed to evaluate the invasive capability, adhesion ability and the cloneforming ability respectively. The drug resistance was detected by CCK8 method. Results The biological charac-teristics of the five kinds of cells in Hep-2, CD44+CD133+, CD44+CD133-, CD44-CD133+and CD44-CD133-were analyzed. The ability of proliferation, invasion, adhesion, clone formation and drug resistance of CD44+CD133+cell subsets were higher than those of other four. CD44+CD133+>CD44-CD133+>Hep2>CD44+CD133->CD44-CD133-. Conclusion MACS is an effective method for sorting CD44+CD133+ cells. CD44+CD133+ cell subsets have obvious characteristics of cancer stem cells , and may make some new exploration for the high expression markers of laryngeal cancer cells.%目的:分选培养和鉴定人喉癌Hep-2细胞珠,并研究其体外生物学特性。方法通过磁珠细胞分选(mag-netic bead cell sorting,MACS)方法,分选培养和鉴定CD44+CD133+喉癌干细胞,应用免疫磁珠分选技术分选CD44+CD133+、CD44+CD133-、CD44-CD133+、CD44-CD133-4种亚群,对4种细胞绘制生长曲线,应用流式细胞仪检测其阳性率,应用侵袭实验、黏附实验和克隆形成实验评价其侵袭能力、黏附能力和克隆形成能力,用CCK8法检测其耐药性。结果对Hep-2、CD44+CD133+亚群、CD44+CD133-亚群、CD44-CD133+亚群、CD44-CD133-亚群5种细胞进行生物学特性研究,CD44+CD133+细胞亚群的增殖、侵

  17. Intragraft Tubular Vimentin and CD44 Expression Correlate With Long-Term Renal Allograft Function and Interstitial Fibrosis and Tubular Atrophy

    NARCIS (Netherlands)

    J. Kers; Y.C. Xu-Dubois; E. Rondeau; N. Claessen; M.M. Idu; J.J.T.H. Roelofs; F.J. Bemelman; R.J.M. ten Berge; S. Florquin

    2010-01-01

    Background. Development of interstitial fibrosis and tubular atrophy (IF/TA) is the main histologic feature involved in renal allograft deterioration. The aim of this study was to validate whether de novo tubular expression of CD44 (transmembrane glycoprotein) and vimentin (mesenchymal cell marker),

  18. EXPRESSION OF INTRON 9 IN CD44 GENE IN CERVICAL CANCER AND CIN AND ITS CLINICAL SIGNIFICANCE

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Objective: To detect the retention of intron 9 in CD44 mRNA in cervical cancer tissue, CIN, cervicitis and their exfoliated cells, and to study their clinical significance in diagnosis and treatment of early-stage, non-invasive cervical cancer. Methods: RT-PCR methods were used to detect the retention of intron 9 in CD44 mRNA in 30 cases of cervical cancer tissue, 11 cases of CIN tissue, 30 cases of cervicitis tissue and their exfoliated cells. Results: The retention rate of intron 9 in CD44 gene transcripts were 76.7% in cervical cancer tissue, 89.8% in corresponding exfoliated cells, 70.8% in CIN tissue, and 60.0% in CIN exfoliated cells, but undetected in neither cervicitis tissue nor exfoliated cells. The relative quantity of intron 9 in CD44 gene transcripts was 1.10 ( 0.12 in cervical cancer tissue, 1.21 ( 0.11 in CIN tissue, 1.11 ( 0.19 in cervical cancer exfoliated cells, 1.17 ( 0.12 in CIN exfoliated cells respectively, but undetected in neither cervicitis tissue nor exfoliated cells. The retention rate and relative content of intron 9 in CD44 gene transcripts in cervical cancer and CIN tissue and their exfoliated cells were statistically higher than that in cervicitis and their exfoliated cells (P0.05). Conclusion: Detecting the retention of intron 9 in CD44 mRNA in cervical exfoliated cells was more sensitivity than traditional cytology exam for diagnosing cervical cancer, and the techniques was worth clinical application.

  19. 癌干细胞标记物CD44与ESA在舌癌淋巴道转移模型中的表达及其意义%Expressions and significance of cancer stem cell markers CD44 and ESA in the metastatic tongue carcinoma lymph nodes of mice

    Institute of Scientific and Technical Information of China (English)

    邹维艳; 王俊斌; 严海芹; 孙美群; 邝晓聪

    2012-01-01

    Objective: To explore the expressions and significance of CSCs associated markers CD44 and ESA in the metastatic tongue carcinoma lymph nodes of mice. Methods: Lymphatic metastatic animal model of tongue carcinoma through foot pad injection of cancer cells was established and metastatic lymph nodes were collected. Cell cultivating technique was employed to induce metastasis in lymph node and to obtain immortalized tongue carcinoma cell line from the metastatic cell. The immortalllized tongue carcinoma cell line cells were subsequently injected into nude mice via the foot pad. The cancer stem cell associated markers,such as CD44 and ESA, were detected by immunohistochemical staining from specimens of metastatic lymph node 4 weeks after injection. Results: In the lymphatic metastatic tongue carcinoma cells, staining of CD44 and ESA were positive. Conclusion: In the lymphatic metastatic tongue carcinoma cells, staining of CD44 and ESA of the concerned surface markers of cancer stem cells were positive, which shows that there may exist CSCs in the metastatic lymph nodes,and hints that the ' seeds' of cancer metastasis may be CSCs.%目的:探讨癌干细胞标记物CD44与ESA蛋白在舌癌淋巴道转移模型中表达情况及其表达意义.方法:采用癌细胞足垫注射法建立淋巴道转移模型,4周后,取转移淋巴结进行原代细胞培养,从中分离、纯化舌癌细胞进行连续传代培养,建立舌癌永生化细胞系,命名为Tca8113-Ml.以舌癌永生化细胞系Tca8113-Ml为研究对象,采用足垫注射细胞的方法建立淋巴道转移模型.4周后,收集淋巴结,免疫组织化学染色检测癌干细胞标记物CD44与ESA蛋白的表达情况.结果:采用Tca8113-Ml建立了舌癌淋巴道转移模型,4周后收集淋巴结,检测癌干细胞标记物CD44与ESA蛋白在舌癌转移淋巴结组织中均呈阳性表达.结论:癌干细胞标记物在淋巴结转移性癌组织中呈阳性表达,表明淋巴结转移灶中有癌干

  20. Expression and analysis of CD44v6 and laminin in esophageal carcinoma%CD44v6,laminin在食管癌中的表达及分析

    Institute of Scientific and Technical Information of China (English)

    秦天洁; 孙红; 王康敏; 黄莺

    2009-01-01

    目的:探讨CD44v6及laminin在食管癌组织中的表达及其与食管癌细胞浸润与转移的关系.方法:采用免疫组化方法检测正常食管黏膜组织、良性病变和食管癌组织及癌旁组织中CD44v6和laminin的表达水平.结果:CD44v6在正常食管组织、良性病变及食管癌中的表达依次增高,laminin的表达依次减低(P<0.05);癌旁组织中CD44v6及laminin的表达与正常食管粘膜组织相比,存在统计学差异;食管癌组织中CD44v6及laminin的表达与组织学分级及淋巴结转移有关(P<0.05),而与临床分期无关;另外,CD44v6的表达与生存期也存在一定关系,CD44v6及laminin之间无明显相关关系.结论:CD44v6和laminin在食管癌的恶性转化和侵袭转移过程中可能起重要作用.

  1. 粘附因子CD44v3在正常绒毛和葡萄胎中的表达及相关性研究%Expression of CD44 v3 and Their Correlation in Normal Placetal Villi and Hydatidiform Mole

    Institute of Scientific and Technical Information of China (English)

    白兴武

    2011-01-01

    目的:探讨CD44v3在正常绒毛和葡萄胎中的表达及相关性.方法:采用免疫组化SABC法检测CD44v3在50例正常绒毛,50例良性葡萄胎,40例恶性葡萄胎的表达情况.结果:CD44v3在正常绒毛,良性葡萄胎,恶性葡萄胎中阳性表达率分别是:8.0%,30.6%,90.0%,组间比较差异有统计学意义(P<0.05).结论:CD44v3的过表达促进葡萄胎的浸润、转移,可作为葡萄胎的浸润、转移及评价预后生物学指标.%Objective: To investigate the expression of CD44 v3 and their correlation in normal placetal villi and hydatidiform mole. Method: The expression of CD44 v3 protein was detected in 50 specimens nomal placetal villi ,50 specimens benign hydatidiform mole and 40 specimens of malignant hydatidiform mole by immunohistochemistry (SABC method ). Result: In normal placetal villi, benign hydatidiform mole, malignant hydatidiform mole ,the expression rate of CD44 v3 were 8.0%, 30.6% and 90.0% respectively . Conclusion:The expressions of CD44v3 are correlated to invasion and metastasis of hydatidiform mole, thus can be as markers to predict metastasis and invasion of hydatidiform mole and the prognosis of these patients as well.

  2. TNF-α pro-inflammatory cytokinemodulates CD44 expression in human lung epithelial cell line (A549 treated with Temporin-Ra

    Directory of Open Access Journals (Sweden)

    Maryam Hooshmand

    2016-03-01

    Full Text Available Antimicrobial peptides (AMPs are molecules present in innate immune systems of vertebrates and invertebrates. These small peptides inhibit the growth of pathogens invading host's body. In this study, the toxicity effect of Temporin-Ra (T-Ra antimicrobial peptide on A549 cell line was investigated by MTT assay. Furthermore, the toxicity of T-Ra peptide on human's red and white blood cells was investigated. Gene expression levels of TNF-α (tumor necrosis factor-alphaaspro-inflammatory cytokine, and CD44 cancer marker were investigated by real time- PCR, 48 h after treatment of A549 cells by different concentrations of peptide. Moreover, the production of reactive oxygen species was studied by flow cytometer. According to our results, T-Ra viability of A549 cells decreased up to 15%, while had no hemolytic and cytotoxic effects on human blood cells. In addition, T-Ra increased the expression of pro- inflammatory cytokine (TNF-α at the highest concentration (30 µg/ml, while decreased gene expression of CD44 cancer marker. Production of reactive oxygen species (ROS in A549 cells treated by T-Ra significantly increased. In conclusion, our results revealed that T-Ra could induce the expression of TNF-α, which consequently decrease CD44 expression, increase the production of reactive oxygen species, and as a result induced death in A549 cell lines.

  3. Inversed relationship between CD44 variant and c-Myc due to oxidative stress-induced canonical Wnt activation

    Energy Technology Data Exchange (ETDEWEB)

    Yoshida, Go J., E-mail: medical21go@yahoo.co.jp; Saya, Hideyuki

    2014-01-10

    Highlights: •CD44 variant8–10 and c-Myc are inversely expressed in gastric cancer cells. •Redox-stress enhances c-Myc expression via canonical Wnt signal. •CD44v, but not CD44 standard, suppresses redox stress-induced Wnt activation. •CD44v expression promotes both transcription and proteasome degradation of c-Myc. •Inversed expression pattern between CD44v and c-Myc is often recognized in vivo. -- Abstract: Cancer stem-like cells express high amount of CD44 variant8-10 which protects cancer cells from redox stress. We have demonstrated by immunohistochemical analysis and Western blotting, and reverse-transcription polymerase chain reaction, that CD44 variant8-10 and c-Myc tend to show the inversed expression manner in gastric cancer cells. That is attributable to the oxidative stress-induced canonical Wnt activation, and furthermore, the up-regulation of the downstream molecules, one of which is oncogenic c-Myc, is not easily to occur in CD44 variant-positive cancer cells. We have also found out that CD44v8-10 expression is associated with the turn-over of the c-Myc with the experiments using gastric cancer cell lines. This cannot be simply explained by the model of oxidative stress-induced Wnt activation. CD44v8-10-positive cancer cells are enriched at the invasive front. Tumor tissue at the invasive area is considered to be composed of heterogeneous cellular population; dormant cancer stem-like cells with CD44v8-10 {sup high}/ Fbw7 {sup high}/ c-Myc {sup low} and proliferative cancer stem-like cells with CD44v8-10 {sup high}/ Fbw7 {sup low}/ c-Myc {sup high}.

  4. A splice variant of CD44 expressed in the apical ectodermal ridge presents fibroblast growth factors to limb mesenchyme and is required for limb outgrowth

    OpenAIRE

    Sherman, Larry; Wainwright, David; Ponta, Helmut; Herrlich, Peter

    1998-01-01

    Signals from the apical ectodermal ridge (AER) of the developing vertebrate limb, including fibroblast growth factor-8 (FGF-8), can maintain limb mesenchymal cells in a proliferative state. We report here that a specific CD44 splice variant is crucial for the proliferation of these mesenchymal cells. Epitopes carried by this variant colocalize temporally and spatially with FGF-8 in the AER throughout early limb development. A splice variant containing the same sequences expressed on model cel...

  5. Correlation of Pokemon, E-cadherin and CD44v6 expression with the ultrasonic appearance in breast carcinoma%Pokemon、E-cadherin和CD44v6蛋白在乳腺癌组织中的表达及其与影像学特征的关系

    Institute of Scientific and Technical Information of China (English)

    鲁豫; 李文涛; 张斌; 吴刚; 于洋

    2010-01-01

    目的 检测Pokemon、E-cadherin和CD44v6蛋白在乳腺癌组织及癌旁组织中的表达,探讨其与影像学表现的关系.方法 60例新鲜乳腺癌标本,所有标本均含有乳腺癌组织及癌旁组织,采用免疫组织化学法分别检测Pokemon、E-cadherin和CD44v6蛋白的表达.用B超观察乳腺癌的影像学特征.结果 乳腺癌组织中Pokemon蛋白表达率为75.0%,高于癌旁乳腺组织中Pokemon蛋白表达率31.7%(P<0.05),乳腺癌组织中E-cadherin蛋白的阳性表达率(55.0%)明显低于癌旁乳腺组织中E-cadherin蛋白的阳性表达率(100.0%)(P<0.05),乳腺癌组织中CD44v6蛋白的表达率(60.0%)显著高于癌旁乳腺组织CD44v6蛋白的表达率(5.0%)(P<0.05).超声观察,Pokemon、E-cadherin和CD44v6蛋白的表达与乳腺癌的浸润、转移明显相关.结论 Pokemon、E-cadherin和CD44v6蛋白可能在乳腺癌发生、发展及转移中发挥作用,Pokemon、E-cadherin和CD44v6蛋白与超声影像结合可能与乳腺癌的预后有关.%Objective To investigate the correlations of Pokemon, E-caderin and CD44v6 expression with the ultrasonic appearance in breast carcinoma. Methods All sixty breast carcinoma samples included both breast carcinoma and surrounding non-tumour breast tissues. Expression of Pokemon, E-caderin and CD44v6 were examined using immunohistochemistry technique. The results were compared with the ultrasonic features of breast carcinoma. Results The frequency of Pokemon protein expression was 31.7% for morphological normal breast tissue and 75.0% for breast cancer. The frequency of E-caderin protein expression was 100.0% for morphological normal breast tissue and 55.0% for breast cancer. The frequency of CD44v6 protein expression was 5.0% for morphological normal breast tissue and 60.0% for breast cancer. Pokemon, E-cadherin and CD44v6 protein expression correlated with breast cancer invasion and metastasis in ultrasonography. Conclusion Expression of Pokemon, E-caderin and CD44v6

  6. Correlation between Abnormal Expressions of CD44 Protein and Gene and Lymph Node Metastasis for Human Lung Carcinoma%人肺癌CD44蛋白和基因的异常表达与淋巴结转移的相关性

    Institute of Scientific and Technical Information of China (English)

    张连斌; 孙玉鹗

    2001-01-01

    目的:研究 CD44蛋白和基因在人肺癌组织中的异常表达,以及这种异常表达与淋巴结转移的相关性。方法:应用 SP免疫组织化学染色方法和 RT PCR/Southern方法,研究人肺癌组织中 CD44蛋白和基因的表达,并应用 QTM970计算机图像分析仪,对免疫组织化学染色结果进行定量分析。结果: SP免疫组织化学染色和计算机图像定量分析结果显示,非小细胞肺癌( non small cell lung carcinomas, NSCLCs)组织比癌旁肺组织,有淋巴结转移比无淋巴结转移的非小细胞肺癌组织染色强度深,差异有极显著意义( F=16.67, P< 0.01); RT PCR/Southern杂交结果显示,有淋巴结转移较无淋巴结转移的非小细胞肺癌表达更多的 CD44 mRNA异常转录子(χ 2=12.13, P< 0.01)。结论: CD44蛋白和基因在人非小细胞肺癌中出现异常表达,这种异常表达在人非小细胞肺癌的发展和淋巴结转移中起重要作用。检测 CD44蛋白和基因的表达,可能对判断非小细胞肺癌病人的预后、预测淋巴结的转移趋势 ,具有重要的临床意义。%Objective:The aim of this study was to investigate the abnormal expressions of CD44 protein and gene, relationship between the abnormal expressions of CD44 protein and gene and lymph node metastasis of human lung carcinomas. Methods: SP immunohistochemistry and RT PCR/Southern methods were used to investigate the expressions of CD44 protein and gene of human lung carcinomas. The immunohistochemistry results were quantitatively analyzed with QTM970 computed image analyzer. Results: SP immunohistochemistry results and quantitative analysis revealed that stronger expression of CD44 protein was observed in non small cell lung carcinomas than in para carcinomatous pulmonary tissues, in non small cell lung carcinomas with lymph node metastasis than in non small cell lung carcinomas without lymph node metastasis

  7. Biomarker screening of oral cancer cell lines revealed sub-populations of CD133-, CD44-, CD24- and ALDH1- positive cancer stem cells

    Directory of Open Access Journals (Sweden)

    Kendall K

    2013-05-01

    Full Text Available Head and neck squamous cell carcinoma (HNSCC ranks sixth worldwide for cancer-related mortality. For the past several decades the mainstay of treatment for HNSCC has been surgery and external beam radiation, although more recent trials combining chemotherapy and radiation have demonstrated improvements. However, cancer recurrence and treatment failures continue to occur in a significant percentage of patients. Recent advances in tumor biology have led to the discovery that many cancers, including HNSCC, may contain subpopulations of cells with stem cell-like properties that may explain relapse and recurrence. The objective of this study was to screen existing oral cancer cell lines for biomarkers specific for cells with stem cell-like properties. RNA was isolated for RT-PCR screening using primers for specific mRNA of the biomarkers: CD44, CD24, CD133, NANOG, Nestin, ALDH1, and ABCG2 in CAL27, SCC25 and SCC15 cells. This analysis revealed that some oral cancer cell lines (CAL27 and SCC25 may contain small subpopulations of adhesion- and contact-independent cells (AiDC that also express tumor stem cell markers, including CD44, CD133, and CD24. In addition, CAL27 cells also expressed the intracellular tumor stem cell markers, ALDH1 and ABCG2. Isolation and culture of the adhesion- and contact-independent cells from CAL27 and SCC25 populations revealed differential proliferation rates and more robust inhibition by the MEK inhibitor PD98059, as well as the chemotherapeutic agents Cisplatin and Paclitaxel, within the AiDC CAL27 cells. At least one oral cancer cell line (CAL27 contained subpopulations of cells that express specific biomarkers associated with tumor stem cells which were morphologically and phenotypically distinct from other cells within this cell line.

  8. Granulocyte colony-stimulating factor-producing undifferentiated carcinoma of the colon mimicking a pulmonary giant cell carcinoma: a case showing overexpression of CD44 along with highly proliferating nestin-positive tumor vessels.

    Science.gov (United States)

    Tajima, Shogo; Waki, Michihiko; Tsuchiya, Tomonori; Hoshi, Shoji

    2014-01-01

    Granulocyte colony-stimulating factor (G-CSF)-producing tumors are known for their aggressive behavior. Only four cases of G-CSF-producing colorectal carcinoma have been previously reported. Herein, we present a case of an undifferentiated carcinoma of the descending colon showing G-CSF production and giant cell carcinoma morphology in a 93-year-old woman. A tumor with a diameter of 80 mm was identified in the descending colon via computed tomography. Descending colectomy was performed involving the abdominal wall where tumor invasion was observed. The white blood cell count, which was elevated before resection, decreased to normal levels after intervention. However, local recurrence at the resected site was detected 39 days after surgery. Upon recurrence, increased white blood cell counts and serum G-CSF were seen. The patient died because of respiratory failure 98 days after colectomy. By using immunohistochemistry, G-CSF expression was detected in tumor cells in the resected specimen, along with overexpression of CD44 and highly proliferating nestin-positive tumor vessels. The poor clinical outcome of this patient is consistent with previous reports that the expression of these three molecules predict poor prognosis. While G-CSF can be a therapeutic target considering its auto/paracrine function to induce tumor growth via the G-CSF receptor, CD44 and nestin may also be possible candidate therapeutic targets. Further studies are required to assess the efficacy of treatments targeting these three molecules.

  9. Expression of Gelatinase, type IV collagen and CD44v6 in colorectal carcinoma%明胶酶、IV型胶原、CD44v6在结直肠癌中的表达

    Institute of Scientific and Technical Information of China (English)

    栗超跃; 银平章; 孔令非

    2003-01-01

    目的:探讨明胶酶在结直肠癌中的表达及其与IV型胶原和CD44v6在结直肠癌侵袭转移过程中的关系.方法:采用明胶酶谱和S-P免疫组化对50例结直肠癌癌组织和相应正常组织中的明胶酶、IV型胶原和CD44v6进行检测.结果:明胶酶在结直肠癌中的表达水平显著高于正常组织(P<0.05);明胶酶与结直肠癌的Dukes分期呈同步的正相关(P<0.05);基底膜中IV型胶原表达减少,明胶酶表达显著增加(P<0.05);明胶酶在CD44v6强阳性组中表达量升高显著(P<0.05).结论:明胶酶与结直肠癌的侵袭转移性有着密切的关系,不仅在癌细胞的酶解,而且在癌细胞的粘附、运动过程中都有可能发挥着重要作用.

  10. Effects of body-resistance strengthening and tumor suppressing granules on immune adhesion function of red blood cells and expression of metastasis protein CD44 in tumor cells of patients with esophageal carcinoma

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    AIM: To investigate the effects of Fuzheng Yiliu granules (body-resistance strengthening and tumor-suppressing granules) in patients with esophageal carcinoma.METHODS: We compared the immune adherent properties of red blood cells (RBCs), the expression of metastasis protein CD44, and the metastasis inhibition factor nm23, in esophageal carcinoma tumor cells of patients before and after radiotherapy in the presence and absence of orally administered Fuzheng Yiliu granules. Sixty-three hospitalized patients with esophageal carcinoma were treated with standard radiotherapy and randomly divided into treatment group (n = 30) treated with both radiotherapy and Fuzheng Yiliu granules and control group (n = 33) given radiotherapy only. Blood samples and tumor tissue were obtained before and after 21 d of treatment. The rosette rates for complement receptor type 3b (C3bRR)and immune complex receptor (ICRR) on RBCs were measured by erythrocyte immunological methods.Expression of CD44 and nm23 in tumor tissue sections was determined by immunohistochemical staining with monoclonal antibodies CD44v6 ad nm23H-1, respectively.RESULTS: The positivity of RBC-C3bRR before and after 21 d of treatment increased from 7.78% ± 1.59% to 10.03% ± 2.01% in the double treatment group,while it changed only slightly from 7.18% ± 1.29% to 7.46% ± 1.12% in the radiotherapy group. The positive rate for RBC-ICRR decreased from 37.68% ± 2.51% to 22.55% ± 1.65% after the double treatment, and from 37.28% ± 2.41% to 24.69% ± 1.91% in radiotherapy group at the same time points. The difference in erythrocyte immune adherent function between the two groups was significant (P < 0.01, t-test). The CD44+-cases were reduced from 21 (70.00%) to 12 (40.00%) after treatment with Fuzheng Yiliu granules, whereas the CD44+-cases (69.70%) in the radiotherapy group remained unchanged. The difference between the treatment (40.00%) and control (69.70%) groups was significant (P < 0.05). Although the nm23

  11. CD44 is the principal cell surface receptor for hyaluronate.

    Science.gov (United States)

    Aruffo, A; Stamenkovic, I; Melnick, M; Underhill, C B; Seed, B

    1990-06-29

    CD44 is a broadly distributed cell surface protein thought to mediate cell attachment to extracelular matrix components or specific cell surface ligands. We have created soluble CD44-immunoglobulin fusion proteins and characterized their reactivity with tissue sections and lymph node high endothelial cells in primary culture. The CD44 target on high endothelial cells is sensitive to enzymes that degrade hyaluronate, and binding of soluble CD44 is blocked by low concentrations of hyaluronate or high concentrations of chondroitin 4- and 6-sulfates. A mouse anti-hamster hyaluonate receptor antibody reacts with COS cells expressing hamster CD44 cDNA. In sections of all tissues examined, including lymph nodes and Peyer's patches, predigestion with hyaluronidase eliminated CD44 binding.

  12. Tunable CD44-specific cellular retargeting with hyaluronic acid nanoshells

    DEFF Research Database (Denmark)

    Ebbesen, Morten F.; Olesen, Morten T. J.; Gjelstrup, Mikkel C.;

    2014-01-01

    Purpose In this work we specifically investigate the molecular weight (Mw) dependent combinatorial properties of hyaluronic acid (HA) for exhibiting stealth and targeting properties using different Mw HA nanoshells to tune nanoparticle retargeting to CD44-expressing cancer cells. Methods HA...... that indicates an extended and nonconstricted HA polymer surface. Reduced non-specific particle interaction in CD44- cells was shown for all HA nanoshells but CD44-dependent cellular retargeting and internalization in CD44+ cells was highly dependent on the coating HA Mw properties. Conclusion The combination...

  13. CD44在胃癌细胞株MKN45悬浮球体细胞中的表达及意义%Expression and significance of CD44 in spheroid body forming cells of the human gastric cancer MKN 45 cell line

    Institute of Scientific and Technical Information of China (English)

    刘建明; 马利林; 周友浪; 陈瑞新; 徐骏飞; 章建国; 刘杰

    2013-01-01

    Objective:To detect the expression of stem-cell related factor CD44 in spheroid body-forming cells of gastric cancer cell line MKN45. Methods: Gastric cancer cell line MKN45 were used to culture spheroid bodies in nonad-herent condition in a serum-free medium (SFM), supplemented with Epidermal Growth Factor (EGF) and Basic Fibroblast Growth Factor(bFGF). By using RT-PCR and western blot analysis, the expression levels of the embryonic stem cell-related gene CD44 were studied. Results: MKN45 cells formed spheroid bodies in nonadherent condition in a serum-free medium were observed, and the spheroid body-forming cells showed higher expressions of the embryonic stem cell-related gene CD44. Conclusion: Spheroid body-forming cells developed from human gastric cancer cell line MKN45 in nonadherent condition in a serum-free medium supplemented with Epidermal Growth Factor (EGF) and Basic Fibroblast Growth Factor (bFGF) were enriched in cancer stem-like cells. Spheroid body formation assay may be a practical and effective approach to isolate and identify CSCs.%目的:检测干细胞相关因子CD44在胃癌细胞株MKN45悬浮球体细胞中的表达。方法:选择人胃癌细胞株MKN45,在含有纤维生长因子-2及表皮生长因子无血清培养液中培养,观察球体形成情况;采用逆转录聚合酶链反应和免疫印迹分析法,检测干细胞相关基因CD44在球体细胞及原代贴壁细胞两组细胞中的表达差异。结果:胃癌细胞株MKN45在无血清培养条件下能形成悬浮球体,球体细胞中CD44的相对表达量高于原代贴壁细胞(P<0.05)。结论:悬浮球培养法在胃癌细胞株MKN45中培养形成的球体细胞富集类肿瘤干细胞。该方法是分选和鉴定肿瘤干细胞的行之有效的方法。

  14. Expression of cathepsin D in urothelial carcinoma of the urinary bladder: an immunohistochemical study including correlations with extracellular matrix components, CD44, p53, Rb, c-erbB-2 and the proliferation indices.

    Science.gov (United States)

    Ioachim, Elli; Charchanti, Antonia; Stavropoulos, Nikolaos; Athanassiou, Evangelia; Bafa, Maria; Agnantis, Niki J

    2002-01-01

    The immunohistochemical Cathepsin D (CD) expression of tumor and stromal cells was investigated in a series of 77 urothelial carcinomas of the urinary bladder with the intention to evaluate its prognostic significance and its contribution to the metastatic potential of bladder cancer. CD expression (clone D13A) was correlated with the expression of extracellular matrix components (collagen type IV, laminin, fibronectin), CD44, p53, pRb, proliferation indices (PCNA and MIB1) as well as with other conventional clininopathological features. CD expression (> 10% of positive tumor cells) was observed in 77.9% of the carcinomas. Stromal CD expression was detected in all cases. Linear collagen type IV and laminin deposit at the tumor-stroma border (in > 25% of the BM) was found in 26% and 57.6% of the cases, respectively. The CD of cancer cells (CCCD) was inversely-correlated with the CD of the stromal cells (p = 0.039), tumor grade (p = 0.0028), tumor stage (p = 0.0046), p53 protein (p = 0.05) and positively-correlated with CD44 (p = 0.002) and pRb (p = 0.05). The stromal cells CD (SCCD) showed a statistically significant positive correlation with tumor grade (p < 0.0001) and stage (p = 0.0001), and the proliferation indices PCNA and MIB1 (p = 0.0001 and p = 0.0002, respectively). These data suggest that both CD of tumor and stromal cells could play important roles in the expansion of urothelial carcinoma of the urinary bladder.

  15. Expression of proliferating cell nuclear antigen and CD44 variant exon 6 in primary tumors and corresponding lymph node metastases of colorectal carcinoma with Dukes'stage C or D

    Institute of Scientific and Technical Information of China (English)

    Ji-Cheng Zhang; Zuo-Ren Wang; Yan-Juan Cheng; Ding-Zhong Yang; Jing-Sen Shi; Ai-Lin Liang; Ning-Na Liu; Xiao-Min Wang

    2003-01-01

    AIM: To study changes in characteristics of colorectal carcinoma during the metastatic process and to investigate the correlation between cell proliferation activity and metastatic ability of patients with Dukes′ stage C or D.METHODS: Formalin fixed and paraffin embedded materials of primary tumors and corresponding lymph node metastases resected from 56 patients with Dukes′ stage C or D of colorectal carcinoma were stained immunohistochemically with proliferating cell nuclear antigen (PCNA) and CD44variant exon 6 (CD44v6).RESULTS: Thirty-one of 56 patients (55.4 %) expressed PCNA in the primary sites and 36 of 56 patients (64.3 %)expressed PCNA in the metastatic lymph nodes. A significant relation in PCNA expression was observed between the primary site and the metastatic lymph node (0.010<P<0.025).Forty-one of 56 patients (73.2 %) expressed CD44v6 in the primary site and 39 of 56 patients (69.6 %) expressed CD44v6 in the metastatic lymph node. There was also an significant relationship of CD44v6 between the primary site and the metastatic lymph node (0.005<P<0.010). No difference was observed between expression of CD44v6 and PCNA in the primary site (0.250<P<0.500).CONCLUSION: This study partially demonstrates that tumor cells in metastatic lymph node of colorectal carcinoma still possess cell proliferation activity and metastatic ability of tumor cells in primary site. There may be no association between cell proliferation activity and metastatic ability in colorectal carcinoma.

  16. CD44v6 in peripheral blood and bone marrow of patients with gastric cancer as micro-metastasis

    Institute of Scientific and Technical Information of China (English)

    Dao-Rong Wang; Guo-Yu Chen; Xun-Liang Liu; Yi Miao; Jian-Guo Xia; Lin-Hai Zhu; Dong Tang

    2006-01-01

    AIM: To detect the expression of CD44 correlated with the ability of micro-metastasis in peripheral blood and bone marrow of patients with gastric cancer and to deduce its clinical significance.METHODS: Preoperative peripheral blood and bone marrow specimens from 46 patients with gastric cancer and 6 controls were studied by semi-quantitative RTPCR amplification of CD44v6mRNA. Preoperative and postoperative peripheral blood specimens from 40patients with gastric cancer and 14 controls were studied by quantitative RT-PCR amplification of CD44v6mRNA in the corresponding period.RESULTS: Semi-quantitative RT-PCR amplification showed that CD44v6mRNA expression of peripheral blood and bone marrow was positive in 39 (84.8%)and 40 (86.9%) of 46 patients with gastric cancer,respectively. In peripheral blood, CD44v6mRNA expression was positive for diffuse type in 30 (93.8%)of 32 patients and for intestinal type in 9 (64.3%)of 14 patients. On the other hand, in bone marrow,CD44v6mRNA expression was positive for diffuse type in 31 (96.9%) of 32 patients and for intestinal type in 10 (71.4%) of 14 patients. There was a significant difference between the diffuse type and intestinal type.Quantitative RT-PCR amplification demonstrated that CD44v6mRNA was not expressed in the peripheral blood of controls and CD44v6mRNA expression was positive for preoperative peripheral blood in 40 patients with gastric cancer, the expression levels being from 4.9×102 to 3.2×105 copies/g RNA. The average expression level of CD44v6mRNA in peripheral blood was 3.9×1010copies/g RNA. The expression levels of CD44v6mRNA in peripheral blood in gastric cancer patients after curative operation increased from 5.5×100 to 7.6×10copies/g RNA (P=0.00496). After curative operation, the expression level decreased markedly.CONCLUSION: Semi-quantitative and quantitative RTPCR amplification for CD44v6mRNA is a sensitive and specific method for the detection of micro-metastasis in peripheral blood and bone

  17. Selective hyaluronan-CD44 signaling promotes miRNA-21 expression and interacts with vitamin D function during cutaneous squamous cell carcinomas progression following UV irradiation

    Directory of Open Access Journals (Sweden)

    Lilly YW Bourguignon

    2015-05-01

    Full Text Available Hyaluronan (HA, the major extracellular matrix component, is often anchored to CD44 isoforms, a family of structurally/functionally important cell surface receptors. Our recent results indicate that UV irradiation (UVR-induced cutaneous squamous cell carcinomas (SCC overexpress a variety of CD44 variant isoforms (CD44v, with different CD44v isoforms appear to confer malignant SCC properties. UVR also stimulates HA degradation in epidermal keratinocytes. Both large HA polymers and their UVR-induced catabolic products (small HA selectively activate CD44 isoform-mediated cellular signaling in normal keratinocytes and SCC cells, with all of the downstream processes being mediated by RhoGTPases (e.g., RhoA and Rac1. Importantly, we found that the hormonally active form of vitamin D (1,25(OH2D3 not only prevents the UVR-induced small HA activation of abnormal keratinocyte behavior and SCC progression, but also enhances large HA stimulation of normal keratinocyte activities and epidermal function(s. Furthermore, we found that HA and its UVR-induced catabolic products (e.g., large and small HA selectively activate CD44-mediated Rac and RhoA signaling. Specifically, large HA-CD44 interaction promotes Rac/PKNγ-dependent normal keratinocyte differentiation, DNA repair and keratinocyte survival. Conversely, small HA-CD44v isoform interaction stimulates RhoA/ROK-dependent NFκB signaling and microRNA-21 (miR-21 production, leading to inflammation, proliferation (following acute UVR response and SCC progression (following chronic UVR exposure. Active vitamin D inhibits small HA-CD44v-mediated RhoA/ROK signaling and SCC progression; and it also enhances large HA-CD44-mediated differentiation, DNA repair and normal epidermal function. Selective applications of large HA and vitamin D will be used to improve the UVR-induced HA (small vs. large HA-CD44 isoform interaction with RhoGTPase signaling and skin inflammation as a potential therapeutic treatment for skin

  18. Analysis of Post-Traumatic Brain Injury Gene Expression Signature Reveals Tubulins, Nfe2l2, Nfkb, Cd44, and S100a4 as Treatment Targets.

    Science.gov (United States)

    Lipponen, Anssi; Paananen, Jussi; Puhakka, Noora; Pitkänen, Asla

    2016-08-17

    We aimed to define the chronically altered gene expression signature of traumatic brain injury (TBI-sig) to discover novel treatments to reverse pathologic gene expression or reinforce the expression of recovery-related genes. Genome-wide RNA-sequencing was performed at 3 months post-TBI induced by lateral fluid-percussion injury in rats. We found 4964 regulated genes in the perilesional cortex and 1966 in the thalamus (FDR < 0.05). TBI-sig was used for a LINCS analysis which identified 11 compounds that showed a strong connectivity with the TBI-sig in neuronal cell lines. Of these, celecoxib and sirolimus were recently reported to have a disease-modifying effect in in vivo animal models of epilepsy. Other compounds revealed by the analysis were BRD-K91844626, BRD-A11009626, NO-ASA, BRD-K55260239, SDZ-NKT-343, STK-661558, BRD-K75971499, ionomycin, and desmethylclomipramine. Network analysis of overlapping genes revealed the effects on tubulins (Tubb2a, Tubb3, Tubb4b), Nfe2l2, S100a4, Cd44, and Nfkb2, all of which are linked to TBI-relevant outcomes, including epileptogenesis and tissue repair. Desmethylclomipramine modulated most of the gene targets considered favorable for TBI outcome. Our data demonstrate long-lasting transcriptomics changes after TBI. LINCS analysis predicted that these changes could be modulated by various compounds, some of which are already in clinical use but never tested in TBI.

  19. Relationship of cytokeratin 20 and CD44 protein expression with WHO/ISUP grade in pTa and pT1 papillary urothelial neoplasia.

    Science.gov (United States)

    Desai, S; Lim, S D; Jimenez, R E; Chun, T; Keane, T E; McKenney, J K; Zavala-Pompa, A; Cohen, C; Young, R H; Amin, M B

    2000-12-01

    The aim of this study was to assess the relationship of immunoreactivity of cytokeratin 20 (CK20) and CD44 across the spectrum of urothelial neoplasia using the WHO/ISUP consensus classification. A total of 120 papillary urothelial pTa and pT1 tumors (8 papillomas, 8 neoplasms of low malignant potential, and 42 low-grade and 62 high-grade carcinomas) were immunostained by using CK20 and CD44 antibodies. The relationships of tumor grade, pathologic stage, recurrences, and progression in stage with CK20 and CD44 immunoreactivity were assessed. WHO/ISUP grade correlated with tumor stage (P ISUP grade and to each other, and our data suggest their potential combined utility in predicting biologic behavior in patients with papillary urothelial pTa and pT1 neoplasms.

  20. CD44 deficiency inhibits unloading-induced cortical bone loss through downregulation of osteoclast activity.

    Science.gov (United States)

    Li, Yuheng; Zhong, Guohui; Sun, Weijia; Zhao, Chengyang; Zhang, Pengfei; Song, Jinping; Zhao, Dingsheng; Jin, Xiaoyan; Li, Qi; Ling, Shukuan; Li, Yingxian

    2015-01-01

    The CD44 is cellular surface adhesion molecule that is involved in physiological processes such as hematopoiesis, lymphocyte homing and limb development. It plays an important role in a variety of cellular functions including adhesion, migration, invasion and survival. In bone tissue, CD44 is widely expressed in osteoblasts, osteoclasts and osteocytes. However, the mechanisms underlying its role in bone metabolism remain unclear. We found that CD44 expression was upregulated during osteoclastogenesis. CD44 deficiency in vitro significantly inhibited osteoclast activity and function by regulating the NF-κB/NFATc1-mediated pathway. In vivo, CD44 mRNA levels were significantly upregulated in osteoclasts isolated from the hindlimb of tail-suspended mice. CD44 deficiency can reduce osteoclast activity and counteract cortical bone loss in the hindlimb of unloaded mice. These results suggest that therapeutic inhibition of CD44 may protect from unloading induced bone loss by inhibiting osteoclast activity.

  1. Rb suppresses collective invasion, circulation and metastasis of breast cancer cells in CD44-dependent manner.

    Directory of Open Access Journals (Sweden)

    Kui-Jin Kim

    Full Text Available Basal-like breast carcinomas (BLCs present with extratumoral lymphovascular invasion, are highly metastatic, presumably through a hematogenous route, have augmented expression of CD44 oncoprotein and relatively low levels of retinoblastoma (Rb tumor suppressor. However, the causal relation among these features is not clear. Here, we show that Rb acts as a key suppressor of multiple stages of metastatic progression. Firstly, Rb suppresses collective cell migration (CCM and CD44-dependent formation of F-actin positive protrusions in vitro and cell-cluster based lymphovascular invasion in vivo. Secondly, Rb inhibits the release of single cancer cells and cell clusters into the hematogenous circulation and subsequent metastatic growth in lungs. Finally, CD44 expression is required for collective motility and all subsequent stages of metastatic progression initiated by loss of Rb function. Altogether, our results suggest that Rb/CD44 pathway is a crucial regulator of CCM and metastatic progression of BLCs and a promising target for anti-BLCs therapy.

  2. The role of a new CD44st in increasing the invasion capability of the human breast cancer cell line MCF-7

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    Jiang Wei

    2011-07-01

    Full Text Available Abstract Background CD44, a hyaluronan (HA receptor, is a multistructural and multifunctional cell surface molecule involved in cell proliferation, cell differentiation, cell migration, angiogenesis, presentation of cytokines, chemokines and growth factors to the corresponding receptors, and docking of proteases at the cell membrane, as well as in signaling for cell survival. The CD44 gene contains 20 exons that are alternatively spliced, giving rise to many CD44 isoforms, perhaps including tumor-specific sequences. Methods Reverse transcriptase polymerase chain reaction (RT-PCR and Western blotting were used to detect CD44st mRNA and CD44 protein in sensitive MCF-7, Lovo, K562 and HL-60 cell lines as well as their parental counterparts, respectively. The full length cDNA encoding CD44st was obtained from the total RNA isolated from MCF-7/Adr cells by RT-PCR, and subcloned into the pMD19-T vector. The CD44st gene sequence and open reading frame were confirmed by restriction enzyme analysis and nucleotide sequencing, and then inserted into the eukaryotic expression vector pcDNA3.1. The pcDNA3.1-CD44st was transfected into MCF-7 cells using Lipofectamine. After transfection, the positive clones were obtained by G418 screening. The changes of the MMP-2 and MMP-9 genes and protein levels were detected by RT-PCR and gelatin zymography, respectively. The number of the cells penetrating through the artificial matrix membrane in each group (MCF-7, MCF-7+HA, MCF-7/neo, MCF-7/neo+HA, MCF-7/CD44st, MCF-7/CD44st+HA and MCF-7/CD44st+Anti-CD44+HA was counted to compare the change of the invasion capability regulated by the CD44st. Erk and P-Erk were investigated by Western blotting to approach the molecular mechanisms of MMP-2 and MMP-9 expression regulated by the CD44st. Results Sensitive MCF-7, Lovo, K562 and HL-60 cells did not contain CD44st mRNA and CD44 protein. In contrast, the multidrug resistance MCF-7/Adr, Lovo/Adr, K562/Adr and HL-60/Adr cells

  3. Modulation of CD44 Activity by A6-Peptide

    Directory of Open Access Journals (Sweden)

    Malcolm eFinlayson

    2015-03-01

    Full Text Available AbstractHyaluronan (HA is a nonsulfated glycosaminoglycan distributed throughout the extracellular matrix that plays a major role in cell adhesion, migration, and proliferation. CD44, a multifunctional cell surface glycoprotein, is a receptor for HA. In addition, CD44 is known to interact with other receptors and ligands, and to mediate a number of cellular functions as well as disease progression. Studies have shown that binding of HA to CD44 in cancer cells activates survival pathways resulting in cancer cell survival. This effect can be blocked by anti-CD44 monoclonal antibodies. A6 is a capped, 8 L-amino acid peptide (Ac-KPSSPPEE-NH2 derived from the biologically active connecting peptide domain of the serine protease, human urokinase plasminogen activator (uPA. A6 does not bind to the uPA receptor (uPAR nor interfere with uPA/uPAR binding. A6 binds to CD44 resulting in the inhibition of migration, invasion, and metastasis of tumor cells, and the modulation of CD44-mediated cell signaling. A6 has been shown to have no dose-limiting toxicity in animal studies. A6 has demonstrated efficacy and an excellent safety profile in Phase 1a, 1b, and 2 clinical trials. In animal models, A6 has also exhibited promising results for the treatment of diabetic retinopathy and wet age-related macular degeneration through the reduction of retinal vascular permeability and inhibition of choroidal neovascularization, respectively. Recently, A6 has been shown to be directly cytotoxic for B-lymphocytes obtained from patients with chronic lymphocytic leukemia (CLL expressing the kinase, ZAP-70. This review will discuss the activity of A6, A6 modulation of HA and CD44, and a novel strategy for therapeutic intervention in disease.

  4. Can CD44 Be a Mediator of Cell Destruction? The Challenge of Type 1 Diabetes.

    Directory of Open Access Journals (Sweden)

    Nathalie Assayag-Asherie

    Full Text Available CD44 is a multi-functional receptor with multiple of isoforms engaged in modulation of cell trafficking and transmission of apoptotic signals. We have previously shown that injection of anti-CD44 antibody into NOD mice induced resistance to type 1 diabetes (T1D. In this communication we describe our efforts to understand the mechanism underlying this effect. We found that CD44-deficient NOD mice develop stronger resistance to T1D than wild-type littermates. This effect is not explained by the involvement of CD44 in cell migration, because CD44-deficient inflammatory cells surprisingly had greater invasive potential than the corresponding wild type cells, probably owing to molecular redundancy. We have previously reported and we show here again that CD44 expression and hyaluronic acid (HA, the principal ligand for CD44 accumulation are detected in pancreatic islets of diabetic NOD mice, but not of non-diabetic DBA/1 mice. Expression of CD44 on insulin-secreting β cells renders them susceptible to the autoimmune attack, and is associated with a diminution in β-cells function (e.g., less insulin production and/or insulin secretion and possibly also with an enhanced apoptosis rate. The diabetes-supportive effect of CD44 expression on β cells was assessed by the TUNEL assay and further strengthened by functional assays exhibiting increased nitric oxide release, reduced insulin secretion after glucose stimulation and decreased insulin content in β cells. All these parameters could not be detected in CD44-deficient islets. We further suggest that HA-binding to CD44-expressing β cells is implicated in β-cell demise. Altogether, these data agree with the concept that CD44 is a receptor capable of modulating cell fate. This finding is important for other pathologies (e.g., cancer, neurodegenerative diseases in which CD44 and HA appear to be implicated.

  5. Thermochemotherapy effect of nanosized As2O3/Fe3O4 complex on experimental mouse tumors and its influence on the expression of CD44v6, VEGF-C and MMP-9

    Directory of Open Access Journals (Sweden)

    Zhang Dongsheng

    2009-10-01

    Full Text Available Abstract Background Both thermotherapy and arsenic have been shown to be active against a broad spectrum of cancers. To reduce the limitations of conventional thermotherapy, improve therapeutic anticancer activity, reduce the toxicity of arsenic on normal tissue, and increase tissue-specific delivery, we prepared a nanosized As2O3/Fe3O4 complex (Fe3O4 magnetic nanoparticles encapsulated in As2O3. We assessed the thermodynamic characteristics of this complex and validated the hyperthermia effect, when combined with magnetic fluid hyperthermia (MFH, on xenograft HeLa cells (human cervical cancer cell line in nude mice. We also measured the effect on the expression of CD44v6, VEGF-C, and MMP-9 which were related to cancer and/or metastasis. Results The nanosized As2O3/Fe3O4 particles were approximately spherical, had good dispersibility as evidenced by TEM, and an average diameter of about 50 nm. With different concentrations of the nanosized As2O3/Fe3O4 complex, the correspondingsuspension of magnetic particles could attain a steady temperature ranging from 42°C to 65°C when placed in AMF for 40 min. Thermochemotherapy with the nanosized As2O3/Fe3O4 complex showed a significant inhibitory effect on the mass (88.21% and volume (91.57% of xenograft cervical tumors (p 2O3/Fe3O4 complex significantly inhibited the expression of CD44v6, VEGF-C, and MMP-9 mRNA (p Conclusion As2O3/Fe3O4 complex combined with MFH had is a promising technique for the minimally invasive elimination of solid tumors and may be have anticancerometastasic effect by inhibiting the expression of CD44v6, VEGF-C, and MMP-9.

  6. Cancer stem-like cells enriched with CD29 and CD44 markers exhibit molecular characteristics with epithelial-mesenchymal transition in squamous cell carcinoma.

    Science.gov (United States)

    Geng, Songmei; Guo, Yuanyuan; Wang, Qianqian; Li, Lan; Wang, Jianli

    2013-01-01

    Increasing evidences have indicated that only a phenotypic subset of cancer cells, termed as the cancer stem cells (CSCs), is capable of initiating tumor growth and provide a reservoir of cells that cause tumor recurrence after therapy. Epithelial-mesenchymal transition (EMT), a cell type change from an epithelial cobblestone phenotype to an elongated fibroblastic phenotype, plays a critical role not only in tumor metastasis but also in tumor recurrence and contributes to drug resistance. Accumulating evidence has shown that cells with an EMT phenotype are rich sources for CSCs, suggesting a biological link between EMT and CSCs; thus study on the link will help understand the cellular and molecular mechanisms of tumor metastasis and drug resistance. CD29 is involved in EMT through cross-talk with cadherins and CD44 has been reported as a successful used marker for CSCs. Here, we try to address whether combination of CD29 and CD44 could be used to identify cancer stem-like cells undergoing EMT in squamous cell carcinoma (SCC) and compare the molecular differences between CD29high/CD44high and CD29low/CD44low cells in SCC. Expression pattern of CD29 and CD44 was analyzed in tissues of skin SCC and cultured A431 cells by immunostaining. Subtype cells of CD29high/CD44high and CD29low/CD44low A431 were sorted by fluorescence-activated cell sorting and proliferating abilities were assayed by cell counting, colony forming and tumorigenicity in NOD/SCID mice. Finally, to probe more deeply into the molecular differences between CD29high/CD44high and CD29low/CD44low A431 cells, gene microarray analysis was applied to compare gene expression profiling. Staining of CD29 and CD44 showed similar heterogeneous expression pattern with positive cells located in the invasion front of SCC tissue as well as in cultured A431 cells. Sorted CD29high/CD44high A431 cells had higher proliferating ability in vitro and in NOD/SCID mice as compared with CD29low/CD44low cells. Gene profiling

  7. CD44v6 regulates growth of brain tumor stem cells partially through the AKT-mediated pathway.

    Directory of Open Access Journals (Sweden)

    Mayumi Jijiwa

    Full Text Available Identification of stem cell-like brain tumor cells (brain tumor stem-like cells; BTSC has gained substantial attention by scientists and physicians. However, the mechanism of tumor initiation and proliferation is still poorly understood. CD44 is a cell surface protein linked to tumorigenesis in various cancers. In particular, one of its variant isoforms, CD44v6, is associated with several cancer types. To date its expression and function in BTSC is yet to be identified. Here, we demonstrate the presence and function of the variant form 6 of CD44 (CD44v6 in BTSC of a subset of glioblastoma multiforme (GBM. Patients with CD44(high GBM exhibited significantly poorer prognoses. Among various variant forms, CD44v6 was the only isoform that was detected in BTSC and its knockdown inhibited in vitro growth of BTSC from CD44(high GBM but not from CD44(low GBM. In contrast, this siRNA-mediated growth inhibition was not apparent in the matched GBM sample that does not possess stem-like properties. Stimulation with a CD44v6 ligand, osteopontin (OPN, increased expression of phosphorylated AKT in CD44(high GBM, but not in CD44(low GBM. Lastly, in a mouse spontaneous intracranial tumor model, CD44v6 was abundantly expressed by tumor precursors, in contrast to no detectable CD44v6 expression in normal neural precursors. Furthermore, overexpression of mouse CD44v6 or OPN, but not its dominant negative form, resulted in enhanced growth of the mouse tumor stem-like cells in vitro. Collectively, these data indicate that a subset of GBM expresses high CD44 in BTSC, and its growth may depend on CD44v6/AKT pathway.

  8. 甲状腺乳头状癌中CD44v6和p16基因表达的原位杂交研究%Expression of CD44v6 and p16 gene in papillary thyroid carcinoma studied by in situ hybridization

    Institute of Scientific and Technical Information of China (English)

    谷化平; 尚培中; 周翠玲

    2002-01-01

    目的探讨CD44v6和p16基因表达与甲状腺乳头状癌(PTC)侵袭转移的关系.方法应用原位杂交方法,检测46例PTC组织中CD44v6和p16的mRNA表达.结果 PTC组织中CD44v6和p16的 mRNA表达阳性率分别为76.1%和60.9%,均与PTC侵袭转移相关(P<0.05); CD44v6 mRNA与p16 mRNA表达呈负相关(r=-0.36,P<0.005).结论 CD44v6和p16基因表达可作为判断PTC预后的参考指标.

  9. The role of CD44 in fetal and adult hematopoietic stem cell regulation.

    Science.gov (United States)

    Cao, Huimin; Heazlewood, Shen Y; Williams, Brenda; Cardozo, Daniela; Nigro, Julie; Oteiza, Ana; Nilsson, Susan K

    2016-01-01

    Throughout development, hematopoietic stem cells migrate to specific microenvironments, where their fate is, in part, extrinsically controlled. CD44 standard as a member of the cell adhesion molecule family is extensively expressed within adult bone marrow and has been previously reported to play important roles in adult hematopoietic regulation via CD44 standard-ligand interactions. In this manuscript, CD44 expression and function are further assessed and characterized on both fetal and adult hematopoietic stem cells. Using a CD44(-/-) mouse model, conserved functional roles of CD44 are revealed throughout development. CD44 is critical in the maintenance of hematopoietic stem and progenitor pools, as well as in hematopoietic stem cell migration. CD44 expression on hematopoietic stem cells as well as other hematopoietic cells within the bone marrow microenvironment is important in the homing and lodgment of adult hematopoietic stem cells isolated from the bone/bone marrow interface. CD44 is also involved in fetal hematopoietic stem cell migration out of the liver, via a process involving stromal cell-derived factor-1α. The absence of CD44 in neonatal bone marrow has no impact on the size of the long-term reconstituting hematopoietic stem cell pool, but results in an enhanced long-term engraftment potential of hematopoietic stem cells.

  10. 粘附分子sICAM-1,sVCAM-1,sCD44在高白细胞急性髓系白血病中的表达%Clinical Significance of Cell Adhesion Molecules sICAM-1, sVCAM-1 and sCD44 Expressions in Hyperleukocytic AML

    Institute of Scientific and Technical Information of China (English)

    杨琦; 郑雪晨; 黄涛生; 臧婷婷; 王占聚

    2014-01-01

    目的探讨高白细胞急性髓系白血病(hyperleukocytic acute myeloid leukemia,HAML)患者治疗前后血清可溶性细胞间粘附分子-1(sICAM-1)、可溶性血管细胞粘附分子(sVCAM-1)和可溶性CD44分子(sCD44)的表达水平及其临床意义。方法采用酶联免疫吸附实验(ELISA),对15例初诊高白细胞急性髓系白血病(WBC>100×109/L)和40例非高白细胞急性髓系白血病(non-hyperleukocytic acute myeloid leukemia,NHAML)(WBC100í109/L) and 40 patients with non-hyperleukocytic acute myeloid leukemia (NHAML, WBC<100í109/L) before and after treatment the serum sICAM-1, sVCAM-1 and sCD44 levels, and compared with the normal people. Results ①Before chemotherapy, NAML and NHAML patient serum sICAM-1, sVCAM-1 and sCD44 levels were significantly higher than those in the control group, the difference has statistical significance. After chemotherapy, in the two groups to achieve remission of bone marrow sICAM-1, sVCAM-1 and sCD44 levels decreased, compared with before treatment was statistical y significant; Compared with the control group, no significant difference. ②Before chemotherapy, HAML patients serum sICAM-1, sVCAM-1 and sCD44 levels were significantly higher than those in NHAML patients with serum sICAM-1, sVCAM-1 and sCD44 level ( <0. 05), HAML patients remission rate (40%) was lower than NHAML patients remission rate (72.5%)( <0.05). Conclusion For patients with HAML, detection of serum sICAM-1, sVCAM-1 and sCD44 levels, help to guide the clinical treatment, provides valuable clinical indicators for monitoring, curative effect observation and prognosis.

  11. Dynamics of hyaluronan, CD44, and inflammatory cells in the rat kidney after ischemia/reperfusion injury.

    Science.gov (United States)

    Declèves, Anne-Emilie; Caron, Nathalie; Nonclercq, Denis; Legrand, Alexandre; Toubeau, Gérard; Kramp, Ronald; Flamion, Bruno

    2006-07-01

    Ischemia/reperfusion (I/R) injury in the kidney involves hemodynamic and cellular dysfunctions as well as leukocyte infiltration. Functional recovery occurs via cell proliferation and/or migration. To determine the roles of hyaluronan (HA) and its main receptor CD44 in renal postischemic processes, we compared their localization and expression with that of neutrophils, macrophages, and PCNA-positive (regenerative) cells as characterized by immunohistochemistry, up to 28 days after I/R in uninephrectomized rats. Observations covered all kidney zones, i.e. cortex (C), outer and inner stripes of outer medulla (OSOM, ISOM), and inner medulla (IM). In controls, HA was localized to the interstitium of IM and ISOM, and CD44 was mostly present on the basolateral membranes of collecting ducts in ISOM, the thin descending limb of Henle's loop and macula densa cells. After I/R, HA and CD44 staining appeared in C and OSOM at 12 h and persisted throughout the regenerative period, i.e. until day 7. Thereafter, they regressed but remained associated with remodeling areas. CD44 expression was found de novo on the apical pole of regenerating, not fully differentiated tubular cells and on some interstitial cells. It was prominent on all infiltrating neutrophils, as soon as 2 h post-I/R, and on 30% of the macrophages, including those in late HA-rich inflammatory granulomas. CD44 is probably involved in early leukocyte infiltration, in tubular regeneration, and in macrophage activity, while HA modifies the physico-chemical environment of interstitial and migrating cells. Based on its presence in remodeling areas, the HA-CD44 pair may be implicated in persistent postichemic inflammation as observed in chronic allograft nephropathy.

  12. Relationship between the expressions of CD44H, p-selectin and VEGF and the metastasis with lymph node in esophageal squamous cell carcinoma%食管鳞癌中CD44H、P-选择素和血管内皮生长因子的表达与淋巴结转移的关系

    Institute of Scientific and Technical Information of China (English)

    李娜; 李继煜; 张景航; 王洪兴; 焦云娟

    2006-01-01

    目的 探讨CD44H、P-选择素(P-selectin)和血管内皮生长因子(VEGF)的表达与食管鳞癌淋巴结转移的关系.方法 采用免疫组织化学SP法检测60例食管鳞癌组织中CD44H、P-selectin和VEGF的表达.结果 淋巴结转移组CD44H、P-selectin和VEGF的表达增强,与无淋巴结转移组的表达差异有显著性意义(P<0.05),P-selectin和VEGF在淋巴结转移组的表达呈正相关(P<0.05).结论 CD44H、P-selectin和VEGF的表达与食管鳞癌淋巴结的转移密切相关,P-selectin和VEGF存在协同关系,可作为评估食管鳞癌预后的生物学标志.

  13. CORRELATION BETWEEN CELL ADHESION MOLLECULES CD44v6 EXPRESSION, DNA CONTENT AND INVASIVE BREAST CARCINOMA%黏附分子CD44v6蛋白表达及DNA含量与乳腺浸润性癌的相关性研究

    Institute of Scientific and Technical Information of China (English)

    吴岳; 王登文; 王成

    2005-01-01

    目的研究CD44v6蛋白表达及DNA含量在浸润性乳腺癌侵袭、转移和预后中的作用.方法应用免疫组化S-P法检测103例浸润性乳腺癌石蜡切片中肿瘤细胞CD44v6的表达,并用图像分析法进行DNA含量分析.结果CD44v6主要定位于细胞质,与乳腺浸润性癌组织学的类型无关(P>0.05),而与组织学的浸润程度有关.CD44v6蛋白在组织学分级:Ⅰ级阳性表达率为57.9%,Ⅱ级为87.0%,Ⅲ级为88.1%(P<0.01).乳腺浸润性癌DNA异倍体情况:采用Feulgen染色示细胞核呈紫红色,胞浆不着色.DNA图像分析结果显示CD44v6蛋白表达阳性者肿瘤细胞异倍体率为82.3%(65/79),表达阴性者肿瘤异倍体为45.9%(11/24),经x2检验有统计学意义(P<0.05).各组织学类型之间异倍体比较,无显著性差异(P>0.05).结论CD44v6蛋白表达与DNA异倍体水平呈平行关系.CD44v6、DNA倍体的联合检测对于指导临床医生的诊断具有重要的意义.因此,结合DNA含量和CD44v6蛋白表达的联合检测,对乳腺浸润性癌的诊断、判断预后价值更大.

  14. Expression of Cdc42,VEGF and CD44v6 in breast invasive ductal carcinoma and their significance%Cdc42、VEGF及CD44v6在乳腺浸润性导管癌中的表达及其意义

    Institute of Scientific and Technical Information of China (English)

    杨瑞东; 尼加提·热合木

    2012-01-01

    目的探讨乳腺浸润性导管癌 (invasive ductal carcinoma,IDCa)中细胞分裂周期蛋白42(cell division cycle 42,Cdc42)、细胞粘附分子(Homing cell adhesion molecule variant6,CD44v6) 及血管内皮生长因子(Vascuoar endothelial growth factor,VEGF) 的表达及其与临床病理参数的关系.方法 采用免疫组织化学SP法检测Cdc42、VEGF、CD44v6在69 例乳腺IDCa中的表达.结果 在乳腺IDCa中Cdc42与VEGF的表达呈正相关(P<0.05),Cdc42与CD44v6的表达没有相关性(P>0.05),在乳腺IDCa中VEGF与CD44v6的表达呈正相关(P<0.05).Cdc42、VEGF、CD44v6在69例乳腺IDCa组织的阳性表达率分别为86.96%、88.41%、78.26%.Cdc42在有或无淋巴结转移组、不同病理分级组表达差异有统计学意义(P<0.05);VEGF在不同肿瘤直径组、不同临床分期组表达差异有统计学意义(P<0.05);CD44v6在有或无淋巴结转移组、不同肿瘤直径组、不同临床分期组表达差异有统计学意义(P<0.05).结论 Cdc42、VEGF、CD44v6在乳腺IDCa发生、发展中可能起协同作用,并可能成为判断预后的指标.

  15. Relationship between the expressions of lymph homing recptors P-selectin, CD44 and α6β1 and lymph metastasis in cervical carcinoma%淋巴归巢受体P选择素、CD44、α6β1在宫颈癌中表达与淋巴转移关系研究

    Institute of Scientific and Technical Information of China (English)

    张素贞; 张凡; 常永霞; 张九鸿; 赵秀芳; 成日青

    2010-01-01

    目的 探讨P选择素(P-selectin)、CD44、整合素α6β1对宫颈癌淋巴转移的作用.方法 应用免疫组织化学方法对比检测35例宫颈鳞状细胞癌原发灶及其淋巴转移灶中P-selectin、CD44、α6β1的表达.结果 与原发灶相比,淋巴转移灶中P-selectin阳性率显著降低(P<0.05),CD44阳性率无显著变化(P=1.230 5),ICAM-1阳性率则显著增高(P<0.01).原发灶中P-selectin与CD44、P-selectin与ICAM-1表达水平均存在显著正相关性(r=0.873 7,P<0.01;r=0.795 7,P<0.01),而CD44与α6β1则呈明显负相关(r=-0.658 3,P<0.01);淋巴转移灶中P-selectin、CD44、α6β1表达水平之间均不存在相关关系;P-selectin原发灶与淋巴转移中表达水平存在明显正相关(r=0.753 4,P<0.01),CD44原发灶与淋巴转移中表达水平之间无明显相关,α6β1原发灶与淋巴转移中表达水平之间存在明显负相关(r=-0.536 1,P<0.01).原发灶中P-selectin表达与肿瘤分化、淋巴结转移存在正相关(r=0.842 0,P<0.01和r=0.768 9,P<0.01);CD44表达与肿瘤侵犯深度、淋巴结转移之间存在正相关(r=0.678 2,P<0.01;r=0.863 4,P<0.01);α6β1表达与淋巴结转移存在正相关(r=0.654 8,P<0.01).结论 P-selectin、CD44、α6β1都与宫颈癌淋巴转移相关,其中P-selectin、CD44在淋巴转移的始动阶段发挥重要作用.

  16. Two Domains of Vimentin Are Expressed on the Surface of Lymph Node, Bone and Brain Metastatic Prostate Cancer Lines along with the Putative Stem Cell Marker Proteins CD44 and CD133

    Energy Technology Data Exchange (ETDEWEB)

    Steinmetz, Nicole F. [Case Western Reserve University, Department of Biomedical Engineering, 10900 Euclid Ave, Cleveland, OH 44106 (United States); Maurer, Jochen [Sanford-Burnham, Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037 (United States); Sheng, Huiming [Torrey Pines Institute for Molecular Studies, Division of Immune Regulation, 3550 General Atomics Court, San Diego, CA 92121 (United States); Bensussan, Armand [INSERM U976, Hôpital Saint Louis, F-75475 Paris (France); Department of Immunology, Dermatology and Oncology, Univ Paris Diderot, Sorbonne Paris Cité, UMRS976 F-75475 Paris (France); Maricic, Igor; Kumar, Vipin [Torrey Pines Institute for Molecular Studies, Laboratory of Autoimmunity, 3550 General Atomics Court, San Diego, CA 92121 (United States); Braciak, Todd A., E-mail: tbraciak@tpims.org [Torrey Pines Institute for Molecular Studies, Division of Immune Regulation, 3550 General Atomics Court, San Diego, CA 92121 (United States)

    2011-07-13

    Vimentin was originally identified as an intermediate filament protein present only as an intracellular component in many cell types. However, this protein has now been detected on the surface of a number of different cancer cell types in a punctate distribution pattern. Increased vimentin expression has been indicated as an important step in epithelial-mesenchymal transition (EMT) required for the metastasis of prostate cancer. Here, using two vimentin-specific monoclonal antibodies (SC5 and V9 directed against the coil one rod domain and the C-terminus of the vimentin protein, respectively), we examined whether either of these domains would be displayed on the surface of three commonly studied prostate cancer cell lines isolated from different sites of metastases. Confocal analysis of LNCaP, PC3 and DU145 prostate cancer cell lines (derived from lymph node, bone or brain prostate metastases, respectively) demonstrated that both domains of vimentin are present on the surface of these metastatic cancer cell types. In addition, flow cytometric analysis revealed that vimentin expression was readily detected along with CD44 expression but only a small subpopulation of prostate cancer cells expressed vimentin and the putative stem cell marker CD133 along with CD44. Finally, Cowpea mosaic virus (CPMV) nanoparticles that target vimentin could bind and internalize into tested prostate cancer cell lines. These results demonstrate that at least two domains of vimentin are present on the surface of metastatic prostate cancer cells and suggest that vimentin could provide a useful target for nanoparticle- or antibody- cancer therapeutic agents directed against highly invasive cancer and/or stem cells.

  17. CD44 alternative splicing in gastric cancer cells is regulated by culture dimensionality and matrix stiffness.

    Science.gov (United States)

    Branco da Cunha, Cristiana; Klumpers, Darinka D; Koshy, Sandeep T; Weaver, James C; Chaudhuri, Ovijit; Seruca, Raquel; Carneiro, Fátima; Granja, Pedro L; Mooney, David J

    2016-08-01

    Two-dimensional (2D) cultures often fail to mimic key architectural and physical features of the tumor microenvironment. Advances in biomaterial engineering allow the design of three-dimensional (3D) cultures within hydrogels that mimic important tumor-like features, unraveling cancer cell behaviors that would not have been observed in traditional 2D plastic surfaces. This study determined how 3D cultures impact CD44 alternative splicing in gastric cancer (GC) cells. In 3D cultures, GC cells lost expression of the standard CD44 isoform (CD44s), while gaining CD44 variant 6 (CD44v6) expression. This splicing switch was reversible, accelerated by nutrient shortage and delayed at lower initial cell densities, suggesting an environmental stress-induced response. It was further shown to be dependent on the hydrogel matrix mechanical properties and accompanied by the upregulation of genes involved in epithelial-mesenchymal transition (EMT), metabolism and angiogenesis. The 3D cultures reported here revealed the same CD44 alternative splicing pattern previously observed in human premalignant and malignant gastric lesions. These findings indicate that fundamental features of 3D cultures - such as soluble factors diffusion and mechanical cues - influence CD44 expression in GC cells. Moreover, this study provides a new model system to study CD44 dysfunction, whose role in cancer has been in the spotlight for decades.

  18. HIV-1 p17 matrix protein interacts with heparan sulfate side chain of CD44v3, syndecan-2, and syndecan-4 proteoglycans expressed on human activated CD4+ T cells affecting tumor necrosis factor alpha and interleukin 2 production.

    Science.gov (United States)

    De Francesco, Maria A; Baronio, Manuela; Poiesi, Claudio

    2011-06-01

    HIV-1 p17 contains C- and N-terminal sequences with positively charged residues and a consensus cluster for heparin binding. We have previously demonstrated by affinity chromatography that HIV-1 p17 binds strongly to heparin-agarose at physiological pH and to human activated CD4(+) T cells. In this study we demonstrated that the viral protein binds to heparan sulfate side chains of syndecan-2, syndecan-4, and CD44v3 purified from HeLa cells and that these heparan sulfate proteoglycans (HSPGs) co-localize with HIV-1 p17 on activated human CD4(+) T cells by confocal fluorescence analysis. Moreover, we observed a stimulatory or inhibitory activity when CD4(+) T cells were activated with mitogens together with nanomolar or micromolar concentrations of the matrix protein.

  19. CD44-engineered mesoporous silica nanoparticles for overcoming multidrug resistance in breast cancer

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Xin; Liu, Ying; Wang, Shouju; Shi, Donghong [Department of Radiology, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing 210002 (China); Zhou, Xianguang [National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing 210016 (China); Wang, Chunyan; Wu, Jiang; Zeng, Zhiyong; Li, Yanjun; Sun, Jing [Department of Radiology, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing 210002 (China); Wang, Jiandong [Department of Pathology, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing 210002 (China); Zhang, Longjiang [Department of Radiology, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing 210002 (China); Teng, Zhaogang, E-mail: tzg@fudan.edu.cn [Department of Radiology, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing 210002 (China); State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (China); Lu, Guangming, E-mail: cjr.luguangming@vip.163.com [Department of Radiology, Jinling Hospital, Clinical School of Medical College, Nanjing University, Nanjing 210002 (China); State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (China)

    2015-03-30

    Graphical abstract: - Highlights: • CD44-engineered mesoporous silica nanoparticles are synthesized. • The mechanism of CD44-engineered mesoporous silica nanoparticles is revealed. • This new delivery system increased the drug accumulation in vitro and in vivo. • This new delivery system offers an effective approach to treat multidrug resistance. - Abstract: Multidrug resistance is a major impediment for the successful chemotherapy in breast cancer. CD44 is over-expressed in multidrug resistant human breast cancer cells. CD44 monoclonal antibody exhibits anticancer potential by inhibiting proliferation and regulating P-glycoprotein-mediated drug efflux activity in multidrug resistant cells. Thereby, CD44 monoclonal antibody in combination with chemotherapeutic drug might be result in enhancing chemosensitivity and overcoming multidrug resistance. The purpose of this study is to investigate the effects of the CD44 monoclonal antibody functionalized mesoporous silica nanoparticles containing doxorubicin on human breast resistant cancer MCF-7 cells. The data showed that CD44-modified mesoporous silica nanoparticles increased cytotoxicity and enhanced the downregulation of P-glycoprotein in comparison to CD44 antibody. Moreover, CD44-engineered mesoporous silica nanoparticles provided active target, which promoted more cellular uptake of DOX in the resistant cells and more retention of DOX in tumor tissues than unengineered counterpart. Animal studies of the resistant breast cancer xenografts demonstrated that CD44-engineered drug delivery system remarkably induced apoptosis and inhibited the tumor growth. Our results indicated that the CD44-engineered mesoporous silica nanoparticle-based drug delivery system offers an effective approach to overcome multidrug resistance in human breast cancer.

  20. CD44 antibodies and immune thrombocytopenia in the amelioration of murine inflammatory arthritis.

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    Patrick J Mott

    Full Text Available Antibodies to CD44 have been used to successfully ameliorate murine models of autoimmune disease. The most often studied disease model has been murine inflammatory arthritis, where a clear mechanism for the efficacy of CD44 antibodies has not been established. We have recently shown in a murine passive-model of the autoimmune disease immune thrombocytopenia (ITP that some CD44 antibodies themselves can induce thrombocytopenia in mice, and the CD44 antibody causing the most severe thrombocytopenia (IM7, also is known to be highly effective in ameliorating murine models of arthritis. Recent work in the K/BxN serum-induced model of arthritis demonstrated that antibody-induced thrombocytopenia reduced arthritis, causing us to question whether CD44 antibodies might primarily ameliorate arthritis through their thrombocytopenic effect. We evaluated IM7, IRAWB14.4, 5035-41.1D, KM201, KM114, and KM81, and found that while all could induce thrombocytopenia, the degree of protection against serum-induced arthritis was not closely related to the length or severity of the thrombocytopenia. CD44 antibody treatment was also able to reverse established inflammation, while thrombocytopenia induced by an anti-platelet antibody targeting the GPIIbIIIa platelet antigen, could not mediate this effect. While CD44 antibody-induced thrombocytopenia may contribute to some of its therapeutic effect against the initiation of arthritis, for established disease there are likely other mechanisms contributing to its efficacy. Humans are not known to express CD44 on platelets, and are therefore unlikely to develop thrombocytopenia after CD44 antibody treatment. An understanding of the relationship between arthritis, thrombocytopenia, and CD44 antibody treatment remains critical for continued development of CD44 antibody therapeutics.

  1. 宫颈上皮内瘤样病变和宫颈癌中CD44v6和P63蛋白表达及其意义%Expression and significance of CD44v6 and P63 protein in cervical intraepithclial neoplasia and cervical cercinoma

    Institute of Scientific and Technical Information of China (English)

    谷化平

    2008-01-01

    目的 探讨CD44v6和p63蛋白在宫颈上皮内瘤样病变(CIN)和浸润宫颈鳞癌(ICC)中的表达及其临床意义.方法 应用免疫组织化学方法,检测30例ICC、20例CIN和10例正常宫颈组织(NCE)中CD44v6和p63蛋白的表达水平,并结合临床病理特征进行分析.结果 (1)在ICC组织中CD44v6蛋白表达阳性率为80.0%(24/30),明显高于CIN(35.0%,7/20,P<0.05)和NCE(30.0%,3/10,P<0.05).(2)全部30例ICC和10例CIN中p63染色均为阳性.ICC分化程度越低,阳性细胞数越高、细胞的着色越深.NCE中仅基底层及上基层细胞阳性.(3)p63表达与ICC组织学分级和淋巴结转移相关(P<0.05).结论 CD44v6和p63可能参与了调控ICC的发生、发展过程,可作为ICC早期诊断指标,其高表达预示ICC预后不良.

  2. CD147, CD44, and the epidermal growth factor receptor (EGFR) signaling pathway cooperate to regulate breast epithelial cell invasiveness.

    Science.gov (United States)

    Grass, G Daniel; Tolliver, Lauren B; Bratoeva, Momka; Toole, Bryan P

    2013-09-06

    The immunoglobulin superfamily glycoprotein CD147 (emmprin; basigin) is associated with an invasive phenotype in various types of cancers, including malignant breast cancer. We showed recently that up-regulation of CD147 in non-transformed, non-invasive breast epithelial cells is sufficient to induce an invasive phenotype characterized by membrane type-1 matrix metalloproteinase (MT1-MMP)-dependent invadopodia activity (Grass, G. D., Bratoeva, M., and Toole, B. P. (2012) Regulation of invadopodia formation and activity by CD147. J. Cell Sci. 125, 777-788). Here we found that CD147 induces breast epithelial cell invasiveness by promoting epidermal growth factor receptor (EGFR)-Ras-ERK signaling in a manner dependent on hyaluronan-CD44 interaction. Furthermore, CD147 promotes assembly of signaling complexes containing CD147, CD44, and EGFR in lipid raftlike domains. We also found that oncogenic Ras regulates CD147 expression, hyaluronan synthesis, and formation of CD147-CD44-EGFR complexes, thus forming a positive feedback loop that may amplify invasiveness. Last, we showed that malignant breast cancer cells are heterogeneous in their expression of surface-associated CD147 and that high levels of membrane CD147 correlate with cell surface EGFR and CD44 levels, activated EGFR and ERK1, and activated invadopodia. Future studies should evaluate CD147 as a potential therapeutic target and disease stratification marker in breast cancer.

  3. Evaluation of Stem Cell Markers, CD44/CD24 in Breast Cancer Cell Lines

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    Masoud Hashemi Arabi

    2014-05-01

    Four breast cancer cell lines, MCF-7 ، T47D ، MDA-MB231 and MDA-MB468 were purchased from National cell Bank of Iran based in Iran Pasture Institute and were cultured in high glucose DMEM supplemented with 10% FCS. Cells were stained with antiCD44-PE and antiCD24-FITC antibodies and Status of CD44 and CD24 as markers of breast cancer stem cells were evaluated using flow cytometer and fluorescent microscopy.Evaluation of CD44 and CD24 as markers of breast cancer stem cells showed that MDA-MB231 with 97±1.2% CD44+/CD24-/low cells is significantly different from the others that they were mainly CD44 and CD24 positive cells(p

  4. CD44+/CD24- Cancer Stem Cells Are Associated With Higher Grade of Canine Mammary Carcinomas.

    Science.gov (United States)

    Im, K S; Jang, Y G; Shin, J I; Kim, N H; Lim, H Y; Lee, S M; Kim, J H; Sur, J H

    2015-11-01

    The CD44+/CD24- phenotype identifies cancer stem cell (CSC) properties in canine mammary carcinoma (MC); however, the histopathological features associated with this phenotype remain to be elucidated. Here, we determined whether the CD44+/CD24- phenotype was associated with hormonal receptor (HR; estrogen receptor [ER] and/or progesterone receptor [PR]) status and/or triple (ER, PR, and human epithelial growth factor receptor 2)-negative (TN) subtype; conventional histological evaluation was also performed. We found that, as single markers, both CD44+ and CD24+ were associated with less aggressive histological types, low grade, and a non-TN subtype; both markers were associated with HR positivity. On the other hand, a CD44+/CD24- phenotype was associated with higher grade of carcinoma. Therefore, our results suggest that immunohistochemical phenotyping for CD44/CD24 is useful for the evaluation of tumor behavior as well as CSC-like properties in canine MCs.

  5. Lung cancer tumorigenicity and drug resistance are maintained through ALDH(hi)CD44(hi) tumor initiating cells.

    Science.gov (United States)

    Liu, Jing; Xiao, Zhijie; Wong, Sunny Kit-Man; Tin, Vicky Pui-Chi; Ho, Ka-Yan; Wang, Junwen; Sham, Mai-Har; Wong, Maria Pik

    2013-10-01

    Limited improvement in long term survival of lung cancer patients has been achieved by conventional chemotherapy or targeted therapy. To explore the potentials of tumor initiating cells (TIC)-directed therapy, it is essential to identify the cell targets and understand their maintenance mechanisms. We have analyzed the performance of ALDH/CD44 co-expression as TIC markers and treatment targets of lung cancer using well-validated in vitro and in vivo analyses in multiple established and patient-derived lung cancer cells. The ALDH(hi)CD44(hi) subset showed the highest enhancement of stem cell phenotypic properties compared to ALDH(hi)CD44(lo), ALDH(lo)CD44(hi), ALDH(lo)CD44(lo) cells and unsorted controls. They showed higher invasion capacities, pluripotency genes and epithelial-mesenchymal transition transcription factors expression, lower intercellular adhesion protein expression and higher G2/M phase cell cycle fraction. In immunosuppressed mice, the ALDH(hi)CD44(hi)xenografts showed the highest tumor induction frequency, serial transplantability, shortest latency, largest volume and highest growth rates. Inhibition of sonic Hedgehog and Notch developmental pathways reduced ALDH+CD44+ compartment. Chemotherapy and targeted therapy resulted in higher AALDH(hi)CD44(hi) subset viability and ALDH(lo)CD44(lo) subset apoptosis fraction. ALDH inhibition and CD44 knockdown led to reduced stemness gene expression and sensitization to drug treatment. In accordance, clinical lung cancers containing a higher abundance of ALDH and CD44-coexpressing cells was associated with lower recurrence-free survival. Together, results suggested theALDH(hi)CD44(hi)compartment was the cellular mediator of tumorigenicity and drug resistance. Further investigation of the regulatory mechanisms underlying ALDH(hi)CD44(hi)TIC maintenance would be beneficial for the development of long term lung cancer control.

  6. Inhibitory effects of muscone on PMNs adherence to HUVEC and the expression of ICAM-1,VCAM-1 and CD44 of HUVEC%麝香酮抑制血管内皮细胞与中性粒细胞黏附及其表面ICAM-1、VCAM-1和CD44表达

    Institute of Scientific and Technical Information of China (English)

    何秀娟; 李萍; 邱全瑛; 盛巡; 王芳; 娄金丽

    2006-01-01

    目的:从中性粒细胞与血管内皮细胞黏附的角度探讨麝香对创伤愈合的作用基础.方法:以TNF处理体外培养的人脐静脉内皮细胞(HUVEC)为模型,应用MTT法、虎红法、荧光免疫组化法研究麝香酮对人外周血中性粒细胞(PMN)与HUVEC黏附及HUVEC表面黏附分子表达的影响.结果:TNF处理HUVEC 12小时,能明显增强PMN与HUVEC黏附(P<0.01),并能明显促进HUVEC表面ICAM-1、VCAM-1和CD44表达(P<0.05).75~150 μg/ml麝香酮作用于TNF活化的HUVEC,明显抑制PMN与HUVEC黏附(P<0.01),仅150 μg/ml时降低HUVEC表面ICAM-1表达(P<0.05),37.5 μg/ml和150 μg/ml时减少其表面VCAM-1表达(P<0.05),75~150 μg/ml时抑制其表面CD44表达(P<0.05或P<0.01).结论:麝香酮通过降低HUVEC表面ICAM-1、VCAM-1和CD44表达而抑制中性粒细胞与血管内皮细胞黏附,可能是麝香促进慢性创面愈合的机制之一.

  7. Effect of CD44 Suppression by Antisense Oligonucleotide on Attachment of Human Trabecular Meshwork Cells to HA

    Institute of Scientific and Technical Information of China (English)

    李中国; 张虹

    2004-01-01

    The effects of suppression of CD44 by CD44-specific antisense oligonucleotide on attachment of human trabecular meshwork cells to hyaluronic acid (HA) were observed and the possible relationship between CD44 and primary open-angle glaucoma (POAG) investigated. CD44-specific antisense oligonucleotide was delivered with cationic lipid to cultured human trabecular meshwork cells. The expression of CD44 suppressed by CD44-specific antisense oligonucleotide was detected by RT-PCR and Western blotting. The effect of CD44 suppression by specific antisense oligonucleotide on attachment of trabecular meshwork cells to HA was measured by MTT assay. Results showed that expression of CD44 was suppressed by CD4, specific antisense oligonucleotide. Antisense oligonucleotide also suppressed the adhesion of human trabecular meshwork cells to HA in a concentration dependent manner. It was concluded that attachment of human trabecular meshwork cells to HA was decreased when CD44 was suppressed by specific antisense oligonucleotide. CD44might play a role in pathogenesis of POAG by affecting the adhesion of trabecular meshwork cells to HA.

  8. The anti-migratory effects of FKBPL and its peptide derivative, AD-01: regulation of CD44 and the cytoskeletal pathway.

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    Anita Yakkundi

    Full Text Available FK506 binding protein-like (FKBPL and its peptide derivatives exert potent anti-angiogenic activity in vitro and in vivo and control tumour growth in xenograft models, when administered exogenously. However, the role of endogenous FKBPL in angiogenesis is not well characterised. Here we investigated the molecular effects of the endogenous protein and its peptide derivative, AD-01, leading to their anti-migratory activity. Inhibition of secreted FKBPL using a blocking antibody or siRNA-mediated knockdown of FKBPL accelerated the migration of human microvascular endothelial cells (HMEC-1. Furthermore, MDA-MB-231 tumour cells stably overexpressing FKBPL inhibited tumour vascular development in vivo suggesting that FKBPL secreted from tumour cells could inhibit angiogenesis. Whilst FKBPL and AD-01 target CD44, the nature of this interaction is not known and here we have further interrogated this aspect. We have demonstrated that FKBPL and AD-01 bind to the CD44 receptor and inhibit tumour cell migration in a CD44 dependant manner; CD44 knockdown abrogated AD-01 binding as well as its anti-migratory activity. Interestingly, FKBPL overexpression and knockdown or treatment with AD-01, regulated CD44 expression, suggesting a co-regulatory pathway for these two proteins. Downstream of CD44, alterations in the actin cytoskeleton, indicated by intense cortical actin staining and a lack of cell spreading and communication were observed following treatment with AD-01, explaining the anti-migratory phenotype. Concomitantly, AD-01 inhibited Rac-1 activity, up-regulated RhoA and the actin binding proteins, profilin and vinculin. Thus the anti-angiogenic protein, FKBPL, and AD-01, offer a promising and alternative approach for targeting both CD44 positive tumours and vasculature networks.

  9. Expression of bax、bcl-2、CD44v6、nm23 protein in transitional cell carcinoma of the bladder%膀胱移行细胞癌中bax、bcl-2、CD44v6、nm23表达

    Institute of Scientific and Technical Information of China (English)

    张玉华; 陈萍; 朴颖实; 韩影; 李弘; 张伟东; 刘宪军; 巩雷; 谢江

    2004-01-01

    目的探讨bax、bcl-2、CD44、nm23基因蛋白在膀胱移行细胞癌(TCC)中的表达.方法应用免疫组化S-P法对64例膀胱TCC及20例正常膀胱黏膜组织中bax、bcl-2、CD44v6、nm23进行检测.结果 64例膀胱TCC中bax阳性率为17.2%(11/64),正常膀胱黏膜组织为90.0%(18/20)(P《0.05). 膀胱TCC中bcl-2阳性表达率为82.8%(53/64),正常膀胱黏膜为20.0%(4/20)(P《0.05).bax 、bcl-2阳性率随组织学分级的提高有逐渐增强的趋势,但无统计学意义(P》0.05);在无浸润及有深层浸润的膀胱TCC中,bax的阳性表达率分别为16.3%、20.0%(P》0.05),bcl-2则分别为83.7%、80.0%(P》0.05);在无复发转移及有复发转移的膀胱TCC中,bax阳性率分别为16.1%、25.0%(P》0.05),bcl-2分别为82.1%、87.5%(P》0.05).64例膀胱TCC中CD44v6阳性表达率为50.0%(32/64),正常膀胱黏膜组织为5.0%(1/20)(P《0.05).nm23在膀胱TCC中的阳性率为76.6%(49/64),正常膀胱黏膜组织为20.0%(4/20)(P《0.05).CD44v6阳性率Ⅰ、Ⅱ级与Ⅲ级相比差异有显著性(P《0.05),nm23阳性率Ⅰ级与Ⅱ、Ⅲ级相比差异有显著性(P《0.05);在有深层浸润的膀胱TCC中CD44v6、nm 23阳性表达率均明显高于无浸润的病例(P《0.05);有复发转移的膀胱TCC CD44v6阳性率高于无复发转移的病例(P《0.05),而nm23在膀胱TCC中的阳性表达率与有无复发转移无明显相关性(P》0.05).结论 bax表达水平下降及bcl-2的表达增强在膀胱TCC的发生中起到重要作用,CD44v6、nm23也参与促进了膀胱TCC的发生.bax、bcl-2与肿瘤的组织学分级、浸润深度、复发、转移等无关,但CD44v6与之呈正相关.nm23与组织学分级、浸润深度呈正相关,而与复发或转移无相关性.

  10. Differentiation of breast cancer stem cells by knockdown of CD44: promising differentiation therapy

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    Pham Phuc V

    2011-12-01

    Full Text Available Abstract Background Breast cancer stem cells (BCSCs are the source of breast tumors. Compared with other cancer cells, cancer stem cells show high resistance to both chemotherapy and radiotherapy. Targeting of BCSCs is thus a potentially promising and effective strategy for breast cancer treatment. Differentiation therapy represents one type of cancer stem-cell-targeting therapy, aimed at attacking the stemness of cancer stem cells, thus reducing their chemo- and radioresistance. In a previous study, we showed that down-regulation of CD44 sensitized BCSCs to the anti-tumor agent doxorubicin. This study aimed to determine if CD44 knockdown caused BCSCs to differentiate into breast cancer non-stem cells (non-BCSCs. Methods We isolated a breast cancer cell population (CD44+CD24- cells from primary cultures of malignant breast tumors. These cells were sorted into four sub-populations based on their expression of CD44 and CD24 surface markers. CD44 knockdown in the BCSC population was achieved using small hairpin RNA lentivirus particles. The differentiated status of CD44 knock-down BCSCs was evaluated on the basis of changes in CD44+CD24- phenotype, tumorigenesis in NOD/SCID mice, and gene expression in relation to renewal status, metastasis, and cell cycle in comparison with BCSCs and non-BCSCs. Results Knockdown of CD44 caused BCSCs to differentiate into non-BCSCs with lower tumorigenic potential, and altered the cell cycle and expression profiles of some stem cell-related genes, making them more similar to those seen in non-BCSCs. Conclusions Knockdown of CD44 is an effective strategy for attacking the stemness of BCSCs, resulting in a loss of stemness and an increase in susceptibility to chemotherapy or radiation. The results of this study highlight a potential new strategy for breast cancer treatment through the targeting of BCSCs.

  11. Evaluation of STAT3 signaling in ALDH+ and ALDH+/CD44+/CD24- subpopulations of breast cancer cells.

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    Li Lin

    Full Text Available BACKGROUND: STAT3 activation is frequently detected in breast cancer and this pathway has emerged as an attractive molecular target for cancer treatment. Recent experimental evidence suggests ALDH-positive (ALDH(+, or cell surface molecule CD44-positive (CD44(+ but CD24-negative (CD24(- breast cancer cells have cancer stem cell properties. However, the role of STAT3 signaling in ALDH(+ and ALDH(+/CD44(+/CD24(- subpopulations of breast cancer cells is unknown. METHODS AND RESULTS: We examined STAT3 activation in ALDH(+ and ALDH(+/CD44(+/CD24(- subpopulations of breast cancer cells by sorting with flow cytometer. We observed ALDH-positive (ALDH(+ cells expressed higher levels of phosphorylated STAT3 compared to ALDH-negative (ALDH(- cells. There was a significant correlation between the nuclear staining of phosphorylated STAT3 and the expression of ALDH1 in breast cancer tissues. These results suggest that STAT3 is activated in ALDH(+ subpopulations of breast cancer cells. STAT3 inhibitors Stattic and LLL12 inhibited STAT3 phosphorylation, reduced the ALDH(+ subpopulation, inhibited breast cancer stem-like cell viability, and retarded tumorisphere-forming capacity in vitro. Similar inhibition of STAT3 phosphorylation, and breast cancer stem cell viability were observed using STAT3 ShRNA. In addition, LLL12 inhibited STAT3 downstream target gene expression and induced apoptosis in ALDH(+ subpopulations of breast cancer cells. Furthermore, LLL12 inhibited STAT3 phosphorylation and tumor cell proliferation, induced apoptosis, and suppressed tumor growth in xenograft and mammary fat pad mouse models from ALDH(+ breast cancer cells. Similar in vitro and tumor growth in vivo results were obtained when ALDH(+ cells were further selected for the stem cell markers CD44(+ and CD24(-. CONCLUSION: These studies demonstrate an important role for STAT3 signaling in ALDH(+ and ALDH(+/CD44(+/CD24(- subpopulations of breast cancer cells which may have cancer stem

  12. Expression and significance of CD56,CD54,CD11a and CD44 in bone marrow of acute myeloid leukemia%黏附分子CD56、CD44、CD54、CD11a在急性髓系白血病骨髓中的表达及意义

    Institute of Scientific and Technical Information of China (English)

    李星; 王立茹; 崔建英; 陈以娟; 张晶晶; 郭慧霞; 武悦; 王敏; 秦亚溱

    2015-01-01

    目的:探讨黏附分子CD56、CD44、CD54、CD11a在急性髓系白血病(AML)骨髓中的表达情况及临床意义.方法:流式细胞仪检测57例AML患者和20例正常对照者骨髓单个核细胞表面CD56、CD44、CD54、CD11a的表达水平,分析其与AML患者白细胞计数、白细胞淤滞及早期病死率的关系.结果:①CD56仅在AML组表达(AML组表达率为35.1%,正常对照组0,P<0.05),其在AML高白细胞(HAML)组的表达率(53.3%)高于AML非高白细胞(NHAML)组(28.6%),白细胞淤滞组(62.5%)高于无白细胞淤滞组(28.9%)(P<0.05);②AML患者骨髓单个核细胞表面CD44的平均荧光强度在HAML组显著高于NHAML组(P<0.05),其表达与AML患者外周血白细胞计数呈正相关(r=0.446,P<0.01).CD56、CD54、CD11a在HAML组与NHAML组、无白细胞淤滞组与白细胞淤滞组的平均荧光强度均差异无统计学意义(P>0.05).③AML患者中HAML组、白细胞淤滞组患者的早期病死率(33.3%、25.0%)分别明显高于NHAML组、无白细胞淤滞组(0、0).结论:CD56在HAML患者和白细胞淤滞患者有更高的表达率,有可能是AML患者预后不良的因素之一;CD44在AML患者骨髓中的表达水平与外周血白细胞计数呈正相关,可能参与HAML的发生.CD54、CD11a与HAML及白细胞淤滞的关系不十分密切.

  13. CD44-Targeted Hyaluronic Acid-Coated Redox-Responsive Hyperbranched Poly(amido amine)/Plasmid DNA Ternary Nanoassemblies for Efficient Gene Delivery.

    Science.gov (United States)

    Gu, Jijin; Chen, Xinyi; Ren, Xiaoqing; Zhang, Xiulei; Fang, Xiaoling; Sha, Xianyi

    2016-07-20

    Hyaluronic acid (HA), which can specifically bind to CD44 receptor, is a specific ligand for targeting to CD44-overexpressing cancer cells. The current study aimed to develop ternary nanoassemblies based on HA-coating for targeted gene delivery to CD44-positive tumors. A novel reducible hyperbranched poly(amido amine) (RHB) was assembled with plasmid DNA (pDNA) to form RHB/pDNA nanoassemblies. HA/RHB/pDNA nanoassemblies were fabricated by coating HA on the surface of the RHB/pDNA nanoassembly core through electrostatic interaction. After optimization, HA/RHB/pDNA nanoassemblies were spherical, core-shell nanoparticles with nanosize (187.6 ± 11.4 nm) and negative charge (-9.1 ± 0.3 mV). The ternary nanoassemblies could efficiently protect the condensed pDNA from enzymatic degradation by DNase I, and HA could significantly improve the stability of nanoassemblies in the sodium heparin solution or serum in vitro. As expected, HA significantly decreased the cytotoxicity of RHB/pDNA nanoassemblies due to the negative surface charges. Moreover, it revealed that HA/RHB/pDNA nanoassemblies showed higher transfection activity than RHB/pDNA nanoassemblies in B16F10 cells, especially in the presence of serum in vitro. Because of the active recognition between HA and CD44 receptor, there was significantly different transfection efficiency between B16F10 (CD44+) and NIH3T3 (CD44-) cells after treatment with HA/RHB/pDNA nanoassemblies. In addition, the cellular targeting and transfection activity of HA/RHB/pDNA nanoassemblies were further evaluated in vivo. The results indicated that the interaction between HA and CD44 receptor dramatically improved the accumulation of HA/RHB/pDNA nanoassemblies in CD44-positive tumor, leading to higher gene expression than RHB/pDNA nanoassemblies. Therefore, HA/RHB/pDNA ternary nanoassemblies may be a potential gene vector for delivery of therapeutic genes to treat CD44-overexpressing tumors in vivo.

  14. In situ identification of CD44+/CD24- cancer cells in primary human breast carcinomas.

    Directory of Open Access Journals (Sweden)

    Giuseppe Perrone

    Full Text Available Breast cancer cells with the CD44+/CD24- phenotype have been reported to be tumourigenic due to their enhanced capacity for cancer development and their self-renewal potential. The identification of human tumourigenic breast cancer cells in surgical samples has recently received increased attention due to the implications for prognosis and treatment, although limitations exist in the interpretation of these studies. To better identify the CD44+/CD24- cells in routine surgical specimens, 56 primary breast carcinoma cases were analysed by immunofluorescence and confocal microscopy, and the results were compared using flow cytometry analysis to correlate the amount and distribution of the CD44+/CD24- population with clinicopathological features. Using these methods, we showed that the breast carcinoma cells displayed four distinct sub-populations based on the expression pattern of CD44 and CD24. The CD44+/CD24- cells were found in 91% of breast tumours and constituted an average of 6.12% (range, 0.11%-21.23% of the tumour. A strong correlation was found between the percentage of CD44+/CD24- cells in primary tumours and distant metastasis development (p = 0.0001; in addition, there was an inverse significant association with ER and PGR status (p = 0.002 and p = 0.001, respectively. No relationship was evident with tumour size (T and regional lymph node (N status, differentiation grade, proliferative index or HER2 status. In a multivariate analysis, the percentage of CD44+/CD24- cancer cells was an independent factor related to metastasis development (p = 0.004. Our results indicate that confocal analysis of fluorescence-labelled breast cancer samples obtained at surgery is a reliable method to identify the CD44+/CD24- tumourigenic cell population, allowing for the stratification of breast cancer patients into two groups with substantially different relapse rates on the basis of CD44+/CD24- cell percentage.

  15. The interaction between aromatase, metalloproteinase 2,9 and cd44 in breast cancer A interação entre aromatase, metalloproteinase 2, 9 e cd44 no câncer de mama

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    Fábio Bagnoli

    2010-01-01

    Full Text Available OBJECTIVE: This study intends to verify the expression levels and correlation of aromatase, matrix metalloproteinase 2 (MMP-2, matrix metalloproteinase 9 (MMP-9 and CD44 in ductal carcinoma in situ (DCIS and infiltrating ductal carcinoma (IDC when both are found in the same breast. METHODS: One hundred and ten cases were evaluated by tissue microarray (TMA and immunohistochemically screened with anti-aromatase polyclonal antibodies, anti-MMP-2 monoclonal antibodies, anti-MMP-9 policlonal antibodies and anti-CD44 monoclonal antibodies. RESULTS: Aromatase was expressed in IDC and DCIS in 63 (57.3% and 60 (67% of the cases respectively; MMP-2 was similarly expressed in IDC and DCIS in 15 (13.60% cases; MMP-9 was positively expressed in IDC and DCIS in 83 (75.50% and 82 (74.50% cases, respectively; CD44 was positively expressed in IDC and DCIS in 49 (44.50% and 48 (42.60% of the cases, respectively; all of them were highly correlated (pOBJETIVO: O objetivo desse estudo é verificar as expressões e correlações da aromatase, metalloproteinase 2 da matriz (MMP2, metalloproteinase 9 da matriz (MMP-9 e CD44 no carcinoma ductal in situ (CDIS e carcinoma ductal infiltrativo (CDI quando ambos estão presentes simultaneamente na mesma mama. MÉTODOS: Foram avaliados 110 casos pelo método de tissue microarray (TMA e através da utilização de anticorpos policlonais antiaromatase, anticorpos monoclonais anti-MMP-2, anticorpos policlonais anti-MMP-9 e anticorpos monoclonais anti-CD44. RESULTADOS: A aromatase estava expressa de forma positiva no CDI e CDIS em 63 (57,3% e 60 (67% casos, respectivamente. A expressão de MMP-2 estava expressa de forma positiva em 15 (13,6% casos tanto no CDI, quanto no CDIS. A expressão da MMP-9 estava expressa de forma positiva em 83 (75,5% e 82 (74,5% casos de CDI e CDIS, respectivamente. A expressão de CD44 estava expressa de forma positiva em 49 (44,5% e 48 (42,6% casos de CDI e CDIS, respectivamente. Todos eles

  16. Synergistic effects of CD44 and TGF-β1 through AKT/GSK-3β/β-catenin signaling during epithelial-mesenchymal transition in liver cancer cells.

    Science.gov (United States)

    Park, Na Ri; Cha, Jung Hoon; Jang, Jeong Won; Bae, Si Hyun; Jang, Bohyun; Kim, Jung-Hee; Hur, Wonhee; Choi, Jong Young; Yoon, Seung Kew

    2016-09-01

    Cancer metastasis is strongly correlated with epithelial-mesenchymal transition (EMT), in which transforming growth factor-β (TGF-β) signaling plays a central role. CD44 has emerged as a cancer stem cell (CSC) marker that strongly induces EMT together with TGF-β1. This study aimed to investigate the link between high CD44 and TGF-β1 levels during EMT in HCC cell lines. FACS analysis showed high expression of CD44 in TGF-β1-positive SNU-368 cells and TGF-β1-negative SNU-354 cells. SNU-368 CD44(+) cells showed EMT through up-regulation of the AKT/GSK-3β/β-catenin pathway. By comparison, SNU-354 CD44(+) cells showed only increased N-cadherin expression, which was not accompanied by a decrease in E-cadherin expression, and also down-regulated the AKT/GSK-3β/β-catenin pathway. However, TGF-β1-stimulated SNU-354 cells (CD44/TGF-β1(+)) exhibited lower E-cadherin and higher N-cadherin expression with increased AKT/GSK-3β/β-catenin pathway activity. CD44/TGF-β1(+) SNU-354 cells also showed enhanced migration and formed larger spheres, while the TGF-β1-induced stem cell properties returned to their original state with the TGF-β1 inhibitor SB431542. SB431542-treated SNU-368 (CD44/TGF-β1(-)) cells also showed diminished N-cadherin and AKT/GSK-3β/β-catenin pathway activity and further decreased cell motility in a wound healing assay. However, CD44 knockdown in SNU-354 cells did not induce EMT even after treatment with TGF-β1. Finally, double inhibition of both CD44 and TGF-β1 further decreased migration and sphere formation more strongly than a single inhibition in SNU-368 cells. In conclusion, the current study demonstrated the synergistic interactions between CD44 and TGF-β1 in EMT induction and CSC properties through the AKT/GSK-3β/β-catenin pathway in HCC cells.

  17. Kaempferol regulates OPN-CD44 pathway to inhibit the atherogenesis of apolipoprotein E deficient mice

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    Xiao, Hong-Bo, E-mail: xhbzhb@yahoo.com [College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128 (China); Lu, Xiang-Yang; Sun, Zhi-Liang [Hunan Agricultural University, Changsha 410128 (China); Zhang, Heng-Bo [Furong District Red Cross Hospital, Changsha 410126 (China)

    2011-12-15

    Recent studies show that osteopontin (OPN) and its receptor cluster of differentiation 44 (CD44) are two pro-inflammatory cytokines contributing to the development of atherosclerosis. The objective of this study was to explore the inhibitory effect of kaempferol, a naturally occurring flavonoid compound, on atherogenesis and the mechanisms involved. The experiments were performed in aorta and plasma from C57BL/6J control and apolipoprotein E-deficient (ApoE{sup -/-}) mice treated or not with kaempferol (50 or 100 mg/kg, intragastrically) for 4 weeks. Kaempferol treatment decreased atherosclerotic lesion area, improved endothelium-dependent vasorelaxation, and increased the maximal relaxation value concomitantly with decrease in the half-maximum effective concentration, plasma OPN level, aortic OPN expression, and aortic CD44 expression in ApoE{sup -/-} mice. In addition, treatment with kaempferol also significantly decreased reactive oxygen species production in mice aorta. The present results suggest that kaempferol regulates OPN-CD44 pathway to inhibit the atherogenesis of ApoE{sup -/-} mice. -- Graphical abstract: Kaempferol regulates OPN-CD44 pathway to inhibit the atherogenesis of ApoE{sup -/-} mice. Highlights: Black-Right-Pointing-Pointer OPN-CD44 pathway plays a critical role in the development of atherosclerosis. Black-Right-Pointing-Pointer We examine lesion area, OPN and CD44 changes after kaempferol treatment. Black-Right-Pointing-Pointer Kaempferol treatment decreased atherosclerotic lesion area in ApoE{sup -/-} mice. Black-Right-Pointing-Pointer Kaempferol treatment decreased aortic OPN and CD44 expressions in ApoE{sup -/-} mice. Black-Right-Pointing-Pointer Kaempferol regulates OPN-CD44 pathway to inhibit the atherogenesis.

  18. CD44: molecular interactions, signalling and functions in the nervous system.

    Directory of Open Access Journals (Sweden)

    Grzegorz Marek Wilczynski

    2015-05-01

    Full Text Available CD44 is the major surface hyaluronan receptor implicated in intercellular and cell-matrix adhesion, cell migration and signalling. It is a transmembrane, highly glycosylated protein with several isoforms resulting from alternative gene splicing. The CD44 molecule consists of several domains serving different functions: the N-terminal extracellular domain, the stem region, the transmembrane domain and the C-terminal tail. In the nervous system, CD44 expression occurs in both glial and neuronal cells. The role of CD44 in the physiology and pathology of the nervous system is not entirely understood, however, there exists evidence suggesting it might be involved in the axon guidance, cytoplasmic Ca2+ clearance, dendritic arborization, synaptic transmission, epileptogenesis, oligodendrocyte and astrocyte differentiation, post-traumatic brain repair and brain tumour development.

  19. Dynamic emergence of the mesenchymal CD44(pos)CD24(neg/low) phenotype in HER2-gene amplified breast cancer cells with de novo resistance to trastuzumab (Herceptin).

    Science.gov (United States)

    Oliveras-Ferraros, Cristina; Vazquez-Martin, Alejandro; Martin-Castillo, Begoña; Cufí, Silvia; Del Barco, Sonia; Lopez-Bonet, Eugeni; Brunet, Joan; Menendez, Javier A

    2010-06-18

    Evidence is mounting that the occurrence of the CD44(pos)/CD24(neg/low) cell population, which contains potential breast cancer (BC) stem cells, could explain BC clinical resistance to HER2-targeted therapies. We investigated whether de novo refractoriness to the anti-HER2 monoclonal antibody trastuzumab (Tzb; Herceptin) may relate to the dynamic regulation of the mesenchymal CD44(pos)/CD24(neg/low) phenotype in HER2-positive BC. We observed that the subpopulation of Tzb-refractory JIMT-1 BC cells exhibiting CD44(pos)/CD24(neg/low)-surface markers switched with time. Low-passage JIMT-1 cell cultures were found to spontaneously contain approximately 10% of cells bearing the CD44(pos)/CD24(neg/low) immunophenotype. Late-passage (>60) JIMT-1 cultures accumulated approximately 80% of CD44(pos)/CD24(neg/low) cells and closely resembled the CD44(pos)/CD24(neg/low)-enriched ( approximately 85%) cell population constitutively occurring in HER2-negative MDA-MB-231 mesenchymal BC cells. Dynamic expression of mesenchymal markers was not limited to CD44/CD24 because high-passages of JIMT-1 cells exhibited also reduced expression of the HER2 protein and over-secretion of pro-invasive/metastatic chemokines and metalloproteases. Accordingly, late-passage JIMT-1 cells displayed an exacerbated migratogenic phenotype in plastic, collagen, and fibronectin substrates. Intrinsic genetic plasticity to efficiently drive the emergence of the CD44(pos)/CD24(neg/low) mesenchymal phenotype may account for de novo resistance to HER2 targeting therapies in basal-like BC carrying HER2 gene amplification.

  20. Tumor-Endothelial Interaction Links the CD44+/CD24- Phenotype with Poor Prognosis in Early-Stage Breast Cancer

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    Martin Buess

    2009-10-01

    Conclusions Our results suggest that the interaction of endothelial cells with tumor cells that express the CD44+/CD24- signature, which indicates a low proliferative potential, might explain the unexpected and paradoxical association of the CD44+/CD24- signature with highly proliferative tumors that have an unfavorable prognosis.

  1. Functionalizing Liposomes with anti-CD44 Aptamer for Selective Targeting of Cancer Cells.

    Science.gov (United States)

    Alshaer, Walhan; Hillaireau, Hervé; Vergnaud, Juliette; Ismail, Said; Fattal, Elias

    2015-07-15

    CD44 receptor protein is found to be overexpressed by many tumors and is identified as one of the most common cancer stem cell surface markers including tumors affecting colon, breast, pancreas, and head and neck, making this an attractive receptor for therapeutic targeting. In this study, 2'-F-pyrimidine-containing RNA aptamer (Apt1), previously selected against CD44, was successfully conjugated to the surface of PEGylated liposomes using the thiol-maleimide click reaction. The conjugation of Apt1 to the surface of liposomes was confirmed by the change in size and zeta potential and by migration on agarose gel electrophoresis. The binding affinity of Apt1 was improved after conjugation compared to free-Apt1. The cellular uptake for Apt1-Lip was tested by flow cytometry and confocal imaging using the two CD44(+) cell lines, human lung cancer cells (A549) and human breast cancer cells (MDA-MB-231), and the CD44(-) cell line, mouse embryonic fibroblast cells (NIH/3T3). The results showed higher sensitivity and selectivity for Apt1-Lip compared to the blank liposomes (Mal-Lip). In conclusion, we demonstrate a successful conjugation of anti-CD44 aptamer to the surface of liposome and binding preference of Apt1-Lip to CD44-expressing cancer cells and conclude to a promising potency of Apt1-Lip as a specific drug delivery system.

  2. ALDH/CD44 identifies uniquely tumorigenic cancer stem cells in salivary gland mucoepidermoid carcinomas.

    Science.gov (United States)

    Adams, April; Warner, Kristy; Pearson, Alexander T; Zhang, Zhaocheng; Kim, Hong Sun; Mochizuki, Daiki; Basura, Gregory; Helman, Joseph; Mantesso, Andrea; Castilho, Rogério M; Wicha, Max S; Nör, Jacques E

    2015-09-29

    A small sub-population of cells characterized by increased tumorigenic potential, ability to self-renew and to differentiate into cells that make up the tumor bulk, has been characterized in some (but not all) tumor types. These unique cells, namedcancer stem cells, are considered drivers of tumor progression in these tumors. The purpose of this work is to understand if cancer stem cells play a functional role in the tumorigenesis of salivary gland mucoepidermoid carcinomas. Here, we investigated the expression of putative cancer stem cell markers (ALDH, CD10, CD24, CD44) in primary human mucoepidermoid carcinomas by immunofluorescence, in vitro salisphere assays, and in vivo tumorigenicity assays in immunodeficient mice. Human mucoepidermoid carcinoma cells (UM-HMC-1, UM-HMC-3A, UM-HMC-3B) sorted for high levels of ALDH activity and CD44 expression (ALDHhighCD44high) consistently formed primary and secondary salispheres in vitro, and showed enhanced tumorigenic potential in vivo (defined as time to tumor palpability, tumor growth after palpability), when compared to ALDHlowCD44low cells. Cells sorted for CD10/CD24, and CD10/CD44 showed varying trends of salisphere formation, but consistently low in vivo tumorigenic potential. And finally, cells sorted for CD44/CD24 showed inconsistent results in salisphere formation and tumorigenic potential assays when different cell lines were evaluated. Collectively, these data demonstrate that salivary gland mucoepidermoid carcinomas contain a small population of cancer stem cells with enhanced tumorigenic potential and that are characterized by high ALDH activity and CD44 expression. These results suggest that patients with mucoepidermoid carcinoma might benefit from therapies that ablate these highly tumorigenic cells.

  3. CD44 Influences Fibroblast Behaviors Via Modulation of Cell-Cell and Cell-Matrix Interactions, Affecting Survivin and Hippo Pathways.

    Science.gov (United States)

    Tsuneki, Masayuki; Madri, Joseph A

    2016-03-01

    CD44 has been studied in a wide variety of cell types, in a diverse array of cell behaviors and in a diverse range of signaling pathways. We now document a role for CD44 in mediating fibroblast behaviors via regulation of N-cadherin, extracellular matrix expression, Survivin and the Hippo pathway. Here, we report our findings on the roles of CD44 in modulating proliferation, apoptosis, migration and invasion of murine wild-type (WT-FB) and CD44 knockout dermal fibroblasts (CD44KO-FB). As we have documented in microvascular endothelial cells lacking CD44, we found persistent increased proliferation, reduced activation of cleaved caspase 3, increased initial attachment, but decreased strength of cell attachment in high cell density, post confluent CD44KO-FB cultures. Additionally, we found that siRNA knock-down of CD44 mimicked the behaviors of CD44KO-FB, restoring the decreases in N-cadherin, collagen type I, fibronectin, Survivin, nuclear fractions of YAP and phospho-YAP and decreased levels of cleaved caspase 3 to the levels observed in CD44KO-FB. Interestingly, plating CD44KO-FB on collagen type I or fibronectin resulted in significant decreases in secondary proliferation rates compared to plating cells on non-coated dishes, consistent with increased cell adhesion compared to their effects on WT-FB. Lastly, siRNA knockdown of CD44 in WT-FB resulted in increased fibroblast migration compared to WT-FB, albeit at reduced rates compared to CD44KO-FB. These results are consistent with CD44's pivotal role in modulating several diverse behaviors important for adhesion, proliferation, apoptosis, migration and invasion during development, growth, repair, maintenance and regression of a wide variety of mesenchymal tissues.

  4. Regulatory T Cells Resist Cyclosporine-Induced Cell Death via CD44-Mediated Signaling Pathways

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    Shannon M. Ruppert

    2015-01-01

    Full Text Available Cyclosporine A (CSA is an immunosuppressive agent that specifically targets T cells and also increases the percentage of pro-tolerogenic CD4+Foxp3+ regulatory T cells (Treg through unknown mechanisms. We previously reported that CD44, a receptor for the extracellular matrix glycosaminoglycan hyaluronan (HA, promotes Treg stability in IL-2-low environments. Here, we asked whether CD44 signaling also promotes Treg resistance to CSA. We found that CD44 cross-linking promoted Foxp3 expression and Treg viability in the setting of CSA treatment. This effect was IL-2 independent but could be suppressed using sc-355979, an inhibitor of Stat5-phosphorylation. Moreover, we found that inhibition of HA synthesis impairs Treg homeostasis but that this effect could be overcome with exogenous IL-2 or CD44-cross-linking. Together, these data support a model whereby CD44 cross-linking by HA promotes IL-2-independent Foxp3 expression and Treg survival in the face of CSA.

  5. A CD44high/EGFRlow subpopulation within head and neck cancer cell lines shows an epithelial-mesenchymal transition phenotype and resistance to treatment.

    Directory of Open Access Journals (Sweden)

    Linnea La Fleur

    Full Text Available Mortality in head and neck squamous cell carcinoma (HNSCC is high due to emergence of therapy resistance which results in local and regional recurrences that may have their origin in resistant cancer stem cells (CSCs or cells with an epithelial-mesenchymal transition (EMT phenotype. In the present study, we investigate the possibility of using the cell surface expression of CD44 and epidermal growth factor receptor (EGFR, both of which have been used as stem cell markers, to identify subpopulations within HNSCC cell lines that differ with respect to phenotype and treatment sensitivity. Three subpopulations, consisting of CD44(high/EGFR(low, CD44(high/EGFR(high and CD44(low cells, respectively, were collected by fluorescence-activated cell sorting. The CD44(high/EGFR(low population showed a spindle-shaped EMT-like morphology, while the CD44(low population was dominated by cobblestone-shaped cells. The CD44(high/EGFR(low population was enriched with cells in G0/G1 and showed a relatively low proliferation rate and a high plating efficiency. Using a real time PCR array, 27 genes, of which 14 were related to an EMT phenotype and two with stemness, were found to be differentially expressed in CD44(high/EGFR(low cells in comparison to CD44(low cells. Moreover, CD44(high/EGFR(low cells showed a low sensitivity to radiation, cisplatin, cetuximab and gefitinib, and a high sensitivity to dasatinib relative to its CD44(high/EGFR(high and CD44(low counterparts. In conclusion, our results show that the combination of CD44 (high and EGFR (low cell surface expression can be used to identify a treatment resistant subpopulation with an EMT phenotype in HNSCC cell lines.

  6. In Situ Identification of CD44+/CD24− Cancer Cells in Primary Human Breast Carcinomas

    Science.gov (United States)

    Perrone, Giuseppe; Gaeta, Laura Maria; Zagami, Mariagiovanna; Nasorri, Francesca; Coppola, Roberto; Borzomati, Domenico; Bartolozzi, Francesco; Altomare, Vittorio; Trodella, Lucio; Tonini, Giuseppe; Santini, Daniele; Cavani, Andrea; Muda, Andrea Onetti

    2012-01-01

    Breast cancer cells with the CD44+/CD24− phenotype have been reported to be tumourigenic due to their enhanced capacity for cancer development and their self-renewal potential. The identification of human tumourigenic breast cancer cells in surgical samples has recently received increased attention due to the implications for prognosis and treatment, although limitations exist in the interpretation of these studies. To better identify the CD44+/CD24− cells in routine surgical specimens, 56 primary breast carcinoma cases were analysed by immunofluorescence and confocal microscopy, and the results were compared using flow cytometry analysis to correlate the amount and distribution of the CD44+/CD24− population with clinicopathological features. Using these methods, we showed that the breast carcinoma cells displayed four distinct sub-populations based on the expression pattern of CD44 and CD24. The CD44+/CD24− cells were found in 91% of breast tumours and constituted an average of 6.12% (range, 0.11%–21.23%) of the tumour. A strong correlation was found between the percentage of CD44+/CD24− cells in primary tumours and distant metastasis development (p = 0.0001); in addition, there was an inverse significant association with ER and PGR status (p = 0.002 and p = 0.001, respectively). No relationship was evident with tumour size (T) and regional lymph node (N) status, differentiation grade, proliferative index or HER2 status. In a multivariate analysis, the percentage of CD44+/CD24− cancer cells was an independent factor related to metastasis development (p = 0.004). Our results indicate that confocal analysis of fluorescence-labelled breast cancer samples obtained at surgery is a reliable method to identify the CD44+/CD24− tumourigenic cell population, allowing for the stratification of breast cancer patients into two groups with substantially different relapse rates on the basis of CD44+/CD24− cell percentage. PMID:23028444

  7. Non-small cell lung cancer cyclooxygenase-2-dependent invasion is mediated by CD44.

    Science.gov (United States)

    Dohadwala, M; Luo, J; Zhu, L; Lin, Y; Dougherty, G J; Sharma, S; Huang, M; Pold, M; Batra, R K; Dubinett, S M

    2001-06-15

    Elevated tumor cyclooxygenase (COX-2) expression is associated with increased angiogenesis, tumor invasion, and suppression of host immunity. We have previously shown that genetic inhibition of tumor COX-2 expression reverses the immunosuppression induced by non-small cell lung cancer (NSCLC). To assess the impact of COX-2 expression in lung cancer invasiveness, NSCLC cell lines were transduced with a retroviral vector expressing the human COX-2 cDNA in the sense (COX-2-S) and antisense (COX-2-AS) orientations. COX-2-S clones expressed significantly more COX-2 protein, produced 10-fold more prostaglandin E(2), and demonstrated an enhanced invasive capacity compared with control vector-transduced or parental cells. CD44, the cell surface receptor for hyaluronate, was overexpressed in COX-2-S cells, and specific blockade of CD44 significantly decreased tumor cell invasion. In contrast, COX-2-AS clones had a very limited capacity for invasion and showed diminished expression of CD44. These findings suggest that a COX-2-mediated, CD44-dependent pathway is operative in NSCLC invasion. Because tumor COX-2 expression appears to have a multifaceted role in conferring the malignant phenotype, COX-2 may be an important target for gene or pharmacologic therapy in NSCLC.

  8. Inhibitory effect of pIRES-scFvCD44-TRAIL on breast cancer cells%pIRES-scFvCD 44-TRAIL 对人乳腺癌细胞株抑制作用的研究

    Institute of Scientific and Technical Information of China (English)

    魏杨辉; 黄耀; 张卫星

    2015-01-01

    目的:探讨CD44单链抗体scFvCD44、肿瘤坏死因子相关凋亡诱导配体( TRAIL)双基因共表达真核载体(pIRES-scFvCD44-TRAIL)对人乳腺癌MDA-MB-231细胞株的抑制作用。方法①细胞实验:采用RT-PCR二步法构建pIRES-scFvCD44-TRAIL并转染MDA-MB-231细胞(转染组);设转染pIRES空质粒的空白组及不作任何处理的阴性组。转染24 h后采用流式细胞仪检测各组细胞凋亡情况,计算细胞凋亡率;行划痕试验比较各组细胞迁移情况,计算划痕愈合率。②移植瘤实验:建立乳腺癌荷瘤裸鼠模型8只并随机分为实验组及对照组。实验组皮下注射pIRES-scFvCD44-TRAIL 100μL/只,隔日1次,共5次;对照组注射等量生理盐水。观察两组移植瘤生长情况,计算抑瘤率;采用免疫组化法检测两组瘤组织中Ki67的表达水平。结果①细胞实验:转染组细胞凋亡率明显高于、划痕愈合率明显低于空白组和阴性组。②移植瘤实验:观察组抑瘤率为79.8%;观察组Ki67的阳性细胞率明显低于对照组,P<0.05。结论 pIRES-scFvCD44-TRAIL可抑制人乳腺癌细胞及其移植肿瘤的生长及转移。%Objective To investigate the inhibitory effects of CD 44 single-chain antibody scFvCD 44 and tumor necrosis factor-related apoptosis inducing ligand eukaryotic expression vector ( pIRES-scFvCD44-TRAIL ) on breast cancer cells MDA-MB-231.Methods ①Cellexperiments:TheplasmidDNAofpIRES-scFvCD44-TRAIL,whosegeneswereampli-fied by reverse transcriptase-polymerase chain reaction ( RT-PCR) , was transfected into breast cancer cells MDA-MB-231 ( the transfected group ) .The blank group was transfected with the blank pIRES plasmid and the negative group was not treated.After 24 hours, the apoptosis rate was calculated by flow cytometry .The scratch test was performed to observe the cell motility assay as well as to calculate the scratch healing rate .② Graft model experiments

  9. Gamma-Secretase Inhibitor IX (GSI) Impairs Concomitant Activation of Notch and wnt-beta-catenin Pathways in CD44(+) Gastric Cancer Stem Cells.

    Science.gov (United States)

    Barat, Samarpita; Chen, Xi; Cuong Bui, Khac; Bozko, Przemyslaw; Götze, Julian; Christgen, Matthias; Krech, Till; Malek, Nisar P; Plentz, Ruben R

    2017-02-03

    Cancer stem cells (CSC) are associated with tumor resistance and are characterized in gastric cancer (GC). Studies have indicated that Notch and wnt-beta-catenin pathways are crucial for CSC development. Using CD44(+) CSCs, we investigated the role of these pathways in GC carcinogenesis. We performed cell proliferation, wound healing, invasion, tumorsphere, and apoptosis assays. Immunoblot analysis of downstream signaling targets of Notch and wnt-beta-catenin were tested after gamma-secretase inhibitor IX (GSI) treatment. Immunohistochemistry, immunofluorescence, and Fluorescence activated cell sorting (FACS) were used to determine CD44 and Hairy enhancer of split-1 (Hes1) expression in human GC tissues. CD44(+) CSCs were subcutaneously injected into NMR-nu/nu mice and treated with vehicle or GSI. GC patients with expression of CD44 and Hes1 showed overall reduced survival. CD44(+) CSCs showed high expression of Hes1. GSI treatment showed effective inhibition of cell proliferation, migration, invasion, tumor sphere formation of CD44(+) CSCs, and induced apoptosis. Importanly, Notch1 was found to be important in mediating a crosstalk between Notch and wnt-beta-catenin in CD44(+) CSCs. Our study highlights a crosstalk between Notch and wnt-beta-catenin in gastric CD44(+) CSCs. Expression of CD44 and Hes1 is associated with patient overall survival. GSI could be an alternative drug to treat GC. © Stem Cells Translational Medicine 2017.

  10. Statin suppresses Hippo pathway-inactivated malignant mesothelioma cells and blocks the YAP/CD44 growth stimulatory axis.

    Science.gov (United States)

    Tanaka, Kosuke; Osada, Hirotaka; Murakami-Tonami, Yuko; Horio, Yoshitsugu; Hida, Toyoaki; Sekido, Yoshitaka

    2017-01-28

    Malignant mesothelioma (MM) frequently exhibits Hippo signaling pathway inactivation (HPI) mainly due to NF2 and/or LATS2 mutations, which leads to the activation of YAP transcriptional co-activator. Here, we show antitumor effects of statin on MM cells with HPI, through the interplay of the mevalonate and Hippo signaling pathways. Statin attenuated proliferation and migration of MM cells harboring NF2 mutation by accelerating YAP phosphorylation/inactivation. CD44 expression was decreased by statin, in parallel with YAP phosphorylation/inactivation. Importantly, we discovered that YAP/TEAD activated CD44 transcription by binding to the CD44 promoter at TEAD-binding sites. On the other hand, CD44 regulated Merlin phosphorylation according to cell density and sequentially promoted YAP transcriptional co-activator, suggesting that CD44 plays two pivotal functional roles as an upstream suppressor of the Hippo pathway and one of downstream targets regulated by YAP/TEAD. Moreover, the YAP/CD44 axis conferred cancer stem cell (CSC)-like properties in MM cells leading to chemoresistance, which was blocked by statin. Together, our findings suggest that YAP mediates CD44 up-regulation at the transcriptional level, conferring CSC-like properties in MM cells, and statin represents a potential therapeutic option against MM by inactivating YAP.

  11. CD44-deficiency attenuates the immunologic responses to LPS and delays the onset of endotoxic shock-induced renal inflammation and dysfunction.

    Directory of Open Access Journals (Sweden)

    Elena Rampanelli

    Full Text Available Acute kidney injury (AKI is a common complication during systemic inflammatory response syndrome (SIRS, a potentially deadly clinical condition characterized by whole-body inflammatory state and organ dysfunction. CD44 is a ubiquitously expressed cell-surface transmembrane receptor with multiple functions in inflammatory processes, including sterile renal inflammation. The present study aimed to assess the role of CD44 in endotoxic shock-induced kidney inflammation and dysfunction by using CD44 KO and WT mice exposed intraperitoneally to LPS for 2, 4, and 24 hours . Upon LPS administration, CD44 expression in WT kidneys was augmented at all time-points. At 2 and 4 hours, CD44 KO animals showed a preserved renal function in comparison to WT mice. In absence of CD44, the pro-inflammatory cytokine levels in plasma and kidneys were lower, while renal expression of the anti-inflammatory cytokine IL-10 was higher. The cytokine levels were associated with decreased leukocyte influx and endothelial activation in CD44 KO kidneys. Furthermore, in vitro assays demonstrated a role of CD44 in enhancing macrophage cytokine responses to LPS and leukocyte migration. In conclusion, our study demonstrates that lack of CD44 impairs the early pro-inflammatory cytokine response to LPS, diminishes leukocyte migration/chemotaxis and endothelial activation, hence, delays endotoxic shock-induced AKI.

  12. A novel mouse model of human breast cancer stem-like cells with high CD44+CD24-/lower phenotype metastasis to human bone

    Institute of Scientific and Technical Information of China (English)

    LING Li-jun; WANG Feng; WANG Shui; LIU Xiao-an; SHEN En-chao; DING Qiang; LU Chao; XU Jian; CAO Qin-hong; ZHU Hai-qing

    2008-01-01

    Background A satisfactory animal model of breast cancer metastasizing to bone is unavailable. In this study, we used human breast cancer stem-like cells and human bone to build a novel "human-source" model of human breast cancer skeletal metastasis.Methods Human breast cancer stem-like cells, the CD44+/CD24-/lower subpopulation, was separated and cultured. Before injection with the stem-like cells, mice were implanted with human bone in the right or left dorsal flanks. Animals in Groups A, B, and C were injected with 1x105, 1x106 human breast cancer stem-like cells, and 1x106 parental MDA-MB-231 cells, respectively. A positive control group (D) without implantation of human bone was also injected with 1x106 MDA-MB-231 cells. Immunohistochemistry was performed for determination of CD34, CD105, smooth muscle antibody, CD44, CD24, cytokine, CXC chemokine receptor-4 (CXCR4), and osteopontin (OPN). mRNA levels of CD44, CD24, CXCR4, and OPN in bone metastasis tissues were analyzed by real-time quantitative polymerase chain reaction (PCR). Results Our results demonstrated that cells in implanted human bones of group B, which received 1x106 cancer stem-like cells, stained strongly positive for CD44, CXCR4, and OPN, whereas those of other groups showed no or minimum staining. Moreover, group B had the highest incidence of human bone metastasis (77.8%, P=0.0230) and no accompaniment of other tissue metastasis. The real-time PCR showed an increase of CD44, CXCR4, and OPN mRNA in metastatic bone tissues in group B compared with those of groups C and D, however the expression of CD24 mRNA in group B were the lowest. Conclusions In the novel "human source" model of breast cancer, breast cancer stem-like cells demonstrated a higher human bone-seeking ability. Its mechanism might be related to the higher expressions of CD44, CXCR4, and OPN, and the lower expression of CD24 in breast cancer stem-like cells.

  13. CD44 plays a functional role in Helicobacter pylori-induced epithelial cell proliferation.

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    Nina Bertaux-Skeirik

    2015-02-01

    Full Text Available The cytotoxin-associated gene (Cag pathogenicity island is a strain-specific constituent of Helicobacter pylori (H. pylori that augments cancer risk. CagA translocates into the cytoplasm where it stimulates cell signaling through the interaction with tyrosine kinase c-Met receptor, leading cellular proliferation. Identified as a potential gastric stem cell marker, cluster-of-differentiation (CD CD44 also acts as a co-receptor for c-Met, but whether it plays a functional role in H. pylori-induced epithelial proliferation is unknown. We tested the hypothesis that CD44 plays a functional role in H. pylori-induced epithelial cell proliferation. To assay changes in gastric epithelial cell proliferation in relation to the direct interaction with H. pylori, human- and mouse-derived gastric organoids were infected with the G27 H. pylori strain or a mutant G27 strain bearing cagA deletion (∆CagA::cat. Epithelial proliferation was quantified by EdU immunostaining. Phosphorylation of c-Met was analyzed by immunoprecipitation followed by Western blot analysis for expression of CD44 and CagA. H. pylori infection of both mouse- and human-derived gastric organoids induced epithelial proliferation that correlated with c-Met phosphorylation. CagA and CD44 co-immunoprecipitated with phosphorylated c-Met. The formation of this complex did not occur in organoids infected with ∆CagA::cat. Epithelial proliferation in response to H. pylori infection was lost in infected organoids derived from CD44-deficient mouse stomachs. Human-derived fundic gastric organoids exhibited an induction in proliferation when infected with H. pylori that was not seen in organoids pre-treated with a peptide inhibitor specific to CD44. In the well-established Mongolian gerbil model of gastric cancer, animals treated with CD44 peptide inhibitor Pep1, resulted in the inhibition of H. pylori-induced proliferation and associated atrophic gastritis. The current study reports a unique

  14. Bioinformatics research of CD44 and epithelial cell adhesion molecule related genes and pathways in colorectal cancer%结直肠癌中CD44和上皮细胞黏附分子相关基因与通路的生物信息学研究

    Institute of Scientific and Technical Information of China (English)

    马敏星; 周瑞; 张嘉刚; 马洪卫; 陶文惠; 赵秋; 李瑾

    2016-01-01

    Objective To investigate genes and involved biological processes closely associated with stem cell markers of colorectal cancer-epithelial cell adhesion molecule (EpCAM) + and CD44+.Methods By the bioinformatics method,with microarray data of colorectal cancer from gene expression omnibus (GEO) database and R2 platform,the genes significantly related with CD44 and EpCAM expression were screened out.The differences in expression of related genes were analyzed on the basis of gender,family history of cancer,alcohol and Dukes stage.The expression of related genes in colorectal cancer was compared with that of other tumors and healthy subjects.At same time,the pathways of the genes and Kyoto encyclopedia of genes and genomes (KEGG) of CD44 and EpCAM significantly related genes were analyzed with gene ontology (GO) and KEGG method.Single factor analysis of variance and Chi-square test of four-fold table with correction for continuity were used for statistical analysis by R2 platform embedded statistical tools.Results The expressions of CD44 and EpCAM were detected in all 315 colorectal cancer samples.A total of 888 and 6 316 genes were screened out which were significantly associated with CD44 and EpCAM expression.CD44 was positively correlated with EpCAM.There was no obvious correlation between the expression of five genes which expressed in all 315 tissues and gender family history of cancer,alcohol and Dukes stage (all P>0.05).By further compared with the expression in other tumors and tissues,the expressions of two genes solute carrier family 12,member 2 (SLC12A2) and proteome of centriole 1 centriolar protein B (POC1B) in colorectal tumor were significantly higher than that in other tumors (F=289.422、128.456,all P<0.01),and its expression in colorectal cancer was obviously higher than that in tissues of health subjects (F=349.519、128.456,all P<0.01).GO analysis indicated there were 15 GO semantics related with both CD44 and EpCAM.The genes related with CD

  15. Oligo-fucoidan prevents renal tubulointerstitial fibrosis by inhibiting the CD44 signal pathway.

    Science.gov (United States)

    Chen, Cheng-Hsien; Sue, Yuh-Mou; Cheng, Chung-Yi; Chen, Yen-Cheng; Liu, Chung-Te; Hsu, Yung-Ho; Hwang, Pai-An; Huang, Nai-Jen; Chen, Tso-Hsiao

    2017-01-18

    Tubulointerstitial fibrosis is recognized as a key determinant of progressive chronic kidney disease (CKD). Fucoidan, a sulphated polysaccharide extracted from brown seaweed, exerts beneficial effects in some nephropathy models. The present study evaluated the inhibitory effect of oligo-fucoidan (800 Da) on renal tubulointerstitial fibrosis. We established a mouse CKD model by right nephrectomy with transient ischemic injury to the left kidney. Six weeks after the surgery, we fed the CKD mice oligo-fucoidan at 10, 20, and 100 mg/kg/d for 6 weeks and found that the oligo-fucoidan doses less than 100 mg/kg/d improved renal function and reduced renal tubulointerstitial fibrosis in CKD mice. Oligo-fucoidan also inhibited pressure-induced fibrotic responses and the expression of CD44, β-catenin, and TGF-β in rat renal tubular cells (NRK-52E). CD44 knockdown downregulated the expression of β-catenin and TGF-β in pressure-treated cells. Additional ligands for CD44 reduced the anti-fibrotic effect of oligo-fucoidan in NRK-52E cells. These data suggest that oligo-fucoidan at the particular dose prevents renal tubulointerstitial fibrosis in a CKD model. The anti-fibrotic effect of oligo-fucoidan may result from interfering with the interaction between CD44 and its extracellular ligands.

  16. Fibroblast invasive migration into fibronectin/fibrin gels requires a previously uncharacterized dermatan sulfate-CD44 proteoglycan

    DEFF Research Database (Denmark)

    Clark, Richard A F; Lin, Fubao; Greiling, Doris;

    2004-01-01

    with chondroitin sulfate and dermatan sulfate, but not heparan sulfate, after a 24 h incubation with platelet-derived growth factor, the stimulus used in the migration assay. These results demonstrate that dermatan sulfate-CD44H proteoglycan is essential for fibroblast migration into fibrin clots and that platelet...... of fibronectin. Several integrins-alpha 4 beta 1, alpha 5 beta 1, and alpha v beta 3-with known fibronectin binding affinity were necessary for this invasive migration. Here we examined another family of cell surface receptors: the proteoglycans. We found that dermatan sulfate was required for fibroblast...... including heparan sulfate and chondroitin sulfate, and as such can bind fibronectin. We found that CD44H, the non-spliced isoform of CD44, was necessary for fibroblast invasion into fibronectin/fibrin gels. Resting fibroblasts expressed mostly nonglycanated CD44H core protein, which became glycanated...

  17. Autocrine/paracrine prostaglandin E2 production by non-small cell lung cancer cells regulates matrix metalloproteinase-2 and CD44 in cyclooxygenase-2-dependent invasion.

    Science.gov (United States)

    Dohadwala, Mariam; Batra, Raj K; Luo, Jie; Lin, Ying; Krysan, Kostyantyn; Pold, Mehis; Sharma, Sherven; Dubinett, Steven M

    2002-12-27

    Tumor cyclooxygenase-2 (COX-2) expression is known to be associated with enhanced tumor invasiveness. In the present study, we evaluated the importance of the COX-2 product prostaglandin E2 (PGE2) and its signaling through the EP4 receptor in mediating non-small cell lung cancer (NSCLC) invasiveness. Genetic inhibition of tumor COX-2 led to diminished matrix metalloproteinase (MMP)-2, CD44, and EP4 receptor expression and invasion. Treatment of NSCLC cells with exogenous 16,16-dimethylprostaglandin E2 significantly increased EP4 receptor, CD44, and MMP-2 expression and matrigel invasion. In contrast, anti-PGE2 decreased EP4 receptor, CD44, and MMP-2 expression in NSCLC cells. EP4 receptor signaling was found to be central to this process, because antisense oligonucleotide-mediated inhibition of tumor cell EP4 receptors significantly decreased CD44 expression. In addition, agents that increased intracellular cAMP, as is typical of EP4 receptor signaling, markedly increased CD44 expression. Moreover, MMP-2-AS treatment decreased PGE2-mediated CD44 expression, and CD44-AS treatment decreased MMP-2 expression. Thus, PGE2-mediated effects through EP4 required the parallel induction of both CD44 and MMP-2 expression because genetic inhibition of either MMP-2 or CD44 expression effectively blocked PGE2-mediated invasion in NSCLC. These findings indicate that PGE2 regulates COX-2-dependent, CD44- and MMP-2-mediated invasion in NSCLC in an autocrine/paracrine manner via EP receptor signaling. Thus, blocking PGE2 production or activity by genetic or pharmacological interventions may prove to be beneficial in chemoprevention or treatment of NSCLC.

  18. Assessing specific oligonucleotides and small molecule antibiotics for the ability to inhibit the CRD-BP-CD44 RNA interaction.

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    Dustin T King

    Full Text Available Studies on Coding Region Determinant-Binding Protein (CRD-BP and its orthologs have confirmed their functional role in mRNA stability and localization. CRD-BP is present in extremely low levels in normal adult tissues, but it is over-expressed in many types of aggressive human cancers and in neonatal tissues. Although the exact role of CRD-BP in tumour progression is unclear, cumulative evidence suggests that its ability to physically associate with target mRNAs is an important criterion for its oncogenic role. CRD-BP has high affinity for the 3'UTR of the oncogenic CD44 mRNA and depletion of CRD-BP in cells led to destabilization of CD44 mRNA, decreased CD44 expression, reduced adhesion and disruption of invadopodia formation. Here, we further characterize the CRD-BP-CD44 RNA interaction and assess specific antisense oligonucleotides and small molecule antibiotics for their ability to inhibit the CRD-BP-CD44 RNA interaction. CRD-BP has a high affinity for binding to CD44 RNA nts 2862-3055 with a Kd of 645 nM. Out of ten antisense oligonucleotides spanning nts 2862-3055, only three antisense oligonucleotides (DD4, DD7 and DD10 were effective in competing with CRD-BP for binding to 32P-labeled CD44 RNA. The potency of DD4, DD7 and DD10 in inhibiting the CRD-BP-CD44 RNA interaction in vitro correlated with their ability to specifically reduce the steady-state level of CD44 mRNA in cells. The aminoglycoside antibiotics neomycin, paramomycin, kanamycin and streptomycin effectively inhibited the CRD-BP-CD44 RNA interaction in vitro. Assessing the potential inhibitory effect of aminoglycoside antibiotics including neomycin on the CRD-BP-CD44 mRNA interaction in cells proved difficult, likely due to their propensity to non-specifically bind nucleic acids. Our results have important implications for future studies in finding small molecules and nucleic acid-based inhibitors that interfere with protein-RNA interactions.

  19. Hyaluronic acid-conjugated liposome nanoparticles for targeted delivery to CD44 overexpressing glioblastoma cells

    Science.gov (United States)

    Hayward, Stephen L.; Wilson, Christina L.; Kidambi, Srivatsan

    2016-01-01

    Glioblastoma Multiforme (GBM) is a highly prevalent and deadly brain malignancy characterized by poor prognosis and restricted disease management potential. Despite the success of nanocarrier systems to improve drug/gene therapy for cancer, active targeting specificity remains a major hurdle for GBM. Additionally, since the brain is a multi-cell type organ, there is a critical need to develop an approach to distinguish between GBM cells and healthy brain cells for safe and successful treatment. In this report, we have incorporated hyaluronic acid (HA) as an active targeting ligand for GBM. To do so, we employed HA conjugated liposomes (HALNPs) to study the uptake pathway in key cells in the brain including primary astrocytes, microglia, and human GBM cells. We observed that the HALNPs specifically target GBM cells over other brain cells due to higher expression of CD44 in tumor cells. Furthermore, CD44 driven HALNP uptake into GBM cells resulted in lysosomal evasion and increased efficacy of Doxorubicin, a model anti-neoplastic agent, while the astrocytes and microglia cells exhibited extensive HALNP-lysosome co-localization and decreased antineoplastic potency. In summary, novel CD44 targeted lipid based nanocarriers appear to be proficient in mediating site-specific delivery of drugs via CD44 receptors in GBM cells, with an improved therapeutic margin and safety. PMID:27120809

  20. WNT5A inhibits metastasis and alters splicing of Cd44 in breast cancer cells.

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    Wen Jiang

    Full Text Available Wnt5a is a non-canonical signaling Wnt. Low expression of WNT5A is correlated with poor prognosis in breast cancer patients. The highly invasive breast cancer cell lines, MDA-MB-231 and 4T1, express very low levels of WNT5A. To determine if enhanced expression of WNT5A would affect metastatic behavior, we generated WNT5A expressing cells from the 4T1 and MDA-MB-231 parental cell lines. WNT5A expressing cells demonstrated cobblestone morphology and reduced in vitro migration relative to controls. Cell growth was not altered. Metastasis to the lung via tail vein injection was reduced in the 4T1-WNT5A expressing cells relative to 4T1-vector controls. To determine the mechanism of WNT5A action on metastasis, we performed microarray and whole-transcriptome sequence analysis (RNA-seq to compare gene expression in 4T1-WNT5A and 4T1-vector cells. Analysis indicated highly significant alterations in expression of genes associated with cellular movement. Down-regulation of a subset of these genes, Mmp13, Nos2, Il1a, Cxcl2, and Lamb3, in WNT5A expressing cells was verified by semi-quantitative RT-PCR. Significant differences in transcript splicing were also detected in cell movement associated genes including Cd44. Cd44 is an adhesion molecule with a complex genome structure. Variable exon usage is associated with metastatic phenotype. Alternative spicing of Cd44 in WNT5A expressing cells was confirmed using RT-PCR. We conclude that WNT5A inhibits metastasis through down-regulation of multiple cell movement pathways by regulating transcript levels and splicing of key genes like Cd44.

  1. Preparation and bioevaluation of {sup 177}Lu-labelled anti-CD44 for radioimmunotherapy of colon cancer

    Energy Technology Data Exchange (ETDEWEB)

    Lee, So Young; Hong, Young Don; Jung, Sung Hee; Choi, Sun Ju [Radioisotope Research Division, Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

    2015-12-15

    CD44 is a particular adhesion molecule and facilitates both cell-cell and cell-matrix interactions. In particular, splice variants of CD44 are particularly overexpressed in a large number of malignancies and carcinomas. In this study, the {sup 177}Lu-labelled CD44 targeting antibody was prepared and bioevaluated in vitro and in vivo. Anti-CD44 was immunoconjugated with the equivalent molar ratio of cysteine-based dtPA-ncS and radioimmunoconjugated with {sup 177}Lu at room temperature within 15 minutes. the stability was tested in human serum. An in vitro study was carried out in Ht-29 human colon cancer cell lines. For the biodistribution study {sup 177}Lu-labelled anti-CD44 was injected in xenograft mice. Anti-CD44 was immunoconjugated with cysteinebased dtPA-ncS and purified by a centricon filter system having a molecular cut-off of 50 kda. radioimmunoconjugation with {sup 177}Lu was reacted for 15 min at room temperature. the radiolabeling yield was >99%, and it was stable in human serum without any fragmentation or degradation. The radioimmunoconjugate showed a high binding affinity on HT-29 colon cancer cell surfaces. In a biodistribution study, the tumor-to-blood ratio of the radioimmunoconjugate was 43 : 1 at 1 day post injection (p.i) in human colon cancer bearing mice. the anti-CD44 monoclonal antibody for the targeting of colon cancer was effectively radioimmunoconjugated with {sup 177}Lu. the in vitro high immunoactivity of this radioimmunoconjugate was determined by a cell binding assay. In addition, the antibody's tumor targeting ability was demonstrated with very high uptake in tumors. this radioimmunoconjugate is applicable to therapy in human colon cancer with highly expressed CD44.

  2. Overexpression of CD44 accompanies acquired tamoxifen resistance in MCF7 cells and augments their sensitivity to the stromal factors, heregulin and hyaluronan

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    Hiscox Stephen

    2012-10-01

    Full Text Available Abstract Background Acquired resistance to endocrine therapy in breast cancer is a significant problem with relapse being associated with local and/or regional recurrence and frequent distant metastases. Breast cancer cell models reveal that endocrine resistance is accompanied by a gain in aggressive behaviour driven in part through altered growth factor receptor signalling, particularly involving erbB family receptors. Recently we identified that CD44, a transmembrane cell adhesion receptor known to interact with growth factor receptors, is upregulated in tamoxifen-resistant (TamR MCF7 breast cancer cells. The purpose of this study was to explore the consequences of CD44 upregulation in an MCF7 cell model of acquired tamoxifen resistance, specifically with respect to the hypothesis that CD44 may influence erbB activity to promote an adverse phenotype. Methods CD44 expression in MCF7 and TamR cells was assessed by RT-PCR, Western blotting and immunocytochemistry. Immunofluorescence and immunoprecipitation studies revealed CD44-erbB associations. TamR cells (± siRNA-mediated CD44 suppression or MCF7 cells (± transfection with the CD44 gene were treated with the CD44 ligand, hyaluronon (HA, or heregulin and their in vitro growth (MTT, migration (Boyden chamber and wound healing and invasion (Matrigel transwell migration determined. erbB signalling was assessed using Western blotting. The effect of HA on erbB family dimerisation in TamR cells was determined by immunoprecipitation in the presence or absence of CD44 siRNA. Results TamR cells overexpressed CD44 where it was seen to associate with erbB2 at the cell surface. siRNA-mediated suppression of CD44 in TamR cells significantly attenuated their response to heregulin, inhibiting heregulin-induced cell migration and invasion. Furthermore, TamR cells exhibited enhanced sensitivity to HA, with HA treatment resulting in modulation of erbB dimerisation, ligand-independent activation of erbB2

  3. Suppression of human breast tumors in NOD/SCID mice by CD44 shRNA gene therapy combined with doxorubicin treatment

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    Pham PV

    2012-05-01

    Full Text Available Phuc Van Pham1, Ngoc Bich Vu1, Thuy Thanh Duong1, Tam Thanh Nguyen1, Nhung Hai Truong1, Nhan Lu Chinh Phan1, Tue Gia Vuong1, Viet Quoc Pham1, Hoang Minh Nguyen1, Kha The Nguyen1, Nhung Thi Nguyen1, Khue Gia Nguyen1, Lam Tan Khat1, Dong Van Le2, Kiet Dinh Truong1, Ngoc Kim Phan11Laboratory of Stem Cell Research and Application, University of Science, Vietnam National University, HCM City, 2Military Medical University, Ha Noi, VietnamBackground: Breast cancer stem cells with a CD44+CD24- phenotype are the origin of breast tumors. Strong CD44 expression in this population indicates its important role in maintaining the stem cell phenotype. Previous studies show that CD44 down-regulation causes CD44+CD24- breast cancer stem cells to differentiate into non-stem cells that are sensitive to antitumor drugs and lose many characteristics of the original cells. In this study, we determined tumor suppression in non-obese severe combined immunodeficiency mice using CD44 shRNA therapy combined with doxorubicin treatment.Methods: Tumor-bearing non-obese severe combined immunodeficiency mice were established by injection of CD44+CD24- cells. To track CD44+CD24- cells, green fluorescence protein was stably transduced using a lentiviral vector prior to injection into mice. The amount of CD44 shRNA lentiviral vector used for transduction was based on CD44 down-regulation by in vitro CD44 shRNA transduction. Mice were treated with direct injection of CD44 shRNA lentiviral vector into tumors followed by doxorubicin administration after 48 hours. The effect was evaluated by changes in the size and weight of tumors compared with that of the control.Results: The combination of CD44 down-regulation and doxorubicin strongly suppressed tumor growth with significant differences in tumor sizes and weights compared with that of CD44 down-regulation or doxorubicin treatment alone. In the combination of CD44 down-regulation and doxorubicin group, the tumor weight was

  4. Curcumin induced nanoscale CD44 molecular redistribution and antigen-antibody interaction on HepG2 cell surface

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    Wang Mu [Department of Chemistry, Jinan University, 601 Huangpu Road West, Tianhe District, Guangzhou 510632 (China); Ruan Yuxia [Department of Ophthalmology, The First Affiliated Hospital, Jinan University, 601 Huangpu Road West, Tianhe District, Guangzhou 510632 (China); Xing Xiaobo; Chen Qian; Peng, Yuan [Department of Chemistry, Jinan University, 601 Huangpu Road West, Tianhe District, Guangzhou 510632 (China); Cai Jiye, E-mail: tjycai@jnu.edu.cn [Department of Chemistry, Jinan University, 601 Huangpu Road West, Tianhe District, Guangzhou 510632 (China)

    2011-07-04

    Graphical abstract: Highlights: > In this study, we investigate the changes of CD44 expression and distribution on HepG2 cells after curcumin treatment. > We find curcumin is able to change the morphology and ultrastructure of HepG2 cells. > Curcumin can reduce the expression of CD44 molecules and induce the nanoscale molecular redistribution on cell surface. > The binding force between CD44-modified AFM tip and the HepG2 cell surface decreases after curcumin-treatment. - Abstract: The cell surface glycoprotein CD44 was implicated in the progression, metastasis and apoptosis of certain human tumors. In this study, we used atomic force microscope (AFM) to monitor the effect of curcumin on human hepatocellular carcinoma (HepG2) cell surface nanoscale structure. High-resolution imaging revealed that cell morphology and ultrastructure changed a lot after being treated with curcumin. The membrane average roughness increased (10.88 {+-} 4.62 nm to 129.70 {+-} 43.72 nm) and the expression of CD44 decreased (99.79 {+-} 0.16% to 75.14 {+-} 8.37%). Laser scanning confocal microscope (LSCM) imaging showed that CD44 molecules were located on the cell membrane. The florescence intensity in control group was weaker than that in curcumin treated cells. Most of the binding forces between CD44 antibodies and untreated HepG2 cell membrane were around 120-220 pN. After being incubated with curcumin, the major forces focused on 70-150 pN (10 {mu}M curcumin-treated) and 50-120 pN (20 {mu}M curcumin-treated). These results suggested that, as result of nanoscale molecular redistribution, changes of the cell surface were in response to external treatment of curcumin. The combination of AFM and LSCM could be a powerful method to detect the distribution of cell surface molecules and interactions between molecules and their ligands.

  5. Overexpression of CD44 in neural precursor cells improves trans-endothelial migration and facilitates their invasion of perivascular tissues in vivo.

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    Cyrille Deboux

    Full Text Available Neural precursor (NPC based therapies are used to restore neurons or oligodendrocytes and/or provide neuroprotection in a large variety of neurological diseases. In multiple sclerosis models, intravenously (i.v -delivered NPCs reduced clinical signs via immunomodulation. We demonstrated recently that NPCs were able to cross cerebral endothelial cells in vitro and that the multifunctional signalling molecule, CD44 involved in trans-endothelial migration of lymphocytes to sites of inflammation, plays a crucial role in extravasation of syngeneic NPCs. In view of the role of CD44 in NPCs trans-endothelial migration in vitro, we questioned presently the benefit of CD44 overexpression by NPCs in vitro and in vivo, in EAE mice. We show that overexpression of CD44 by NPCs enhanced over 2 folds their trans-endothelial migration in vitro, without impinging on the proliferation or differentiation potential of the transduced cells. Moreover, CD44 overexpression by NPCs improved significantly their elongation, spreading and number of filopodia over the extracellular matrix protein laminin in vitro. We then tested the effect of CD44 overexpression after i.v. delivery in the tail vein of EAE mice. CD44 overexpression was functional invivo as it accelerated trans-endothelial migration and facilitated invasion of HA expressing perivascular sites. These in vitro and in vivo data suggest that CD44 may be crucial not only for NPC crossing the endothelial layer but also for facilitating invasion of extravascular tissues.

  6. Triple negative breast tumors in African-American and Hispanic/Latina women are high in CD44+, low in CD24+, and have loss of PTEN.

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    Yanyuan Wu

    Full Text Available African-American women have higher mortality from breast cancer than other ethnic groups. The association between poor survival and differences with tumor phenotypes is not well understood. The purpose of this study is to assess the clinical significance of (1 Stem cell-like markers CD44 and CD24; (2 PI3K/Akt pathway associated targets PTEN, activation of Akt, and FOXO1; and (3 the Insulin-like growth factor-1 (IGF-I and IGF binding protein-3 (IGFBP3 in different breast cancer subtypes, and compare the differences between African-American and Hispanic/Latina women who have similar social-economic-status.A total of N=318 African-American and Hispanic/Latina women, with clinically-annotated information within the inclusion criteria were included. Formalin fixed paraffin embedded tissues from these patients were tested for the different markers using immunohistochemistry techniques. Kaplan-Meier survival-curves and Cox-regression analyses were used to assess Relative Risk and Disease-Free-Survival (DFS.The triple-negative-breast-cancer (TNBC receptor-subtype was more prevalent among premenopausal women, and the Hormonal Receptor (HR positive subtype was most common overall. TNBC tumors were more likely to have loss of PTEN, express high Ki67, and have increased CD44+/CD24- expression. TNBC was also associated with higher plasma-IGF-I levels. HR-/HER2+ tumors showed high pAkt, decreased FOXO1, and high CD24+ expression. The loss of PTEN impacted DFS significantly in African Americans, but not in Hispanics/Latinas after adjusted for treatment and other tumor pathological factors. The CD44+/CD24- and CD24+/CD44- phenotypes decreased DFS, but were not independent predictors for DFS. HER2-positive and TNBC type of cancers continued to exhibit significant decrease in DFS after adjusting for the selected biomarkers and treatment.TNBC incidence is high among African-American and Hispanic/Latino women residing in South Los Angeles. Our study also shows for

  7. Whole-genome approach implicates CD44 in cellular resistance to carboplatin

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    Shukla Sunita J

    2009-01-01

    Full Text Available Abstract Carboplatin is a chemotherapeutic agent used in the management of many cancers, yet treatment is limited by resistance and toxicities. To achieve a better understanding of the genetic contribution to carboplatin resistance or toxicities, lymphoblastoid cell lines from 34 large Centre d'Etude du Polymorphisme Humain pedigrees were utilised to evaluate interindividual variation in carboplatin cytotoxicity. Significant heritability, ranging from 0.17-0.36 (p = 1 × 10-7 to 9 × 10-4, was found for cell growth inhibition following 72-hour treatment at each carboplatin concentration (10, 20, 40 and 80 μM and IC50 (concentration for 50 per cent cell growth inhibition. Linkage analysis revealed 11 regions with logarithm of odds (LOD scores greater than 1.5. The highest LOD score on chromosome 11 (LOD = 3.36, p = 4.2 × 10-5 encompasses 65 genes within the 1 LOD confidence interval for the carboplatin IC50. We further analysed the IC50 phenotype with a linkage-directed association analysis using 71 unrelated HapMap and Perlegen cell lines and identified 18 single nucleotide polymorphisms within eight genes that were significantly associated with the carboplatin IC50 (p -5; false discovery rate 50 values of the eight associated genes, which identified the most significant correlation between CD44 expression and IC50 (r2 = 0.20; p = 6 × 10-4. The quantitative real-time polymerase chain reaction further confirmed a statistically significant difference in CD44 expression levels between carboplatin-resistant and -sensitive cell lines (p = 5.9 × 10-3. Knockdown of CD44 expression through small interfering RNA resulted in increased cellular sensitivity to carboplatin (p CD44 as being important in conferring cellular resistance to carboplatin.

  8. Preparation and reactivities of anti-porcine CD44 monoclonal antibodies.

    Science.gov (United States)

    Yang, H; Hutchings, A; Binns, R M

    1993-04-01

    Five monoclonal antibodies (MoAbs) were raised against porcine soluble CD44. The MoAbs recognized the same antigen on the surface of porcine lymphocytes as was recognized by anti-human CD44 MoAb Hermes-1, but identified five different epitopes. They bound to most porcine leucocytes but not to red cells. The epitopes were susceptible to treatment with papain or bromelain, whereas trypsinization of porcine leucocytes only reduced the antigen density. The epitopes seem to be co-expressed among various lymphoid tissues. The MoAbs also cross-reacted to various degrees with leucocytes of humans, dogs, sheep, cattle, goats and horses, suggesting that the corresponding epitopes are differentially conserved among species.

  9. CCR2 and CD44 promote inflammatory cell recruitment during fatty liver formation in a lithogenic diet fed mouse model.

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    Charlotte E Egan

    Full Text Available Non-alcoholic fatty liver disease (NAFLD is a common disease with a spectrum of presentations. The current study utilized a lithogenic diet model of NAFLD. The diet was fed to mice that are either resistant (AKR or susceptible (BALB/c and C57BL/6 to hepatitis followed by molecular and flow cytometric analysis. Following this, a similar approach was taken in congenic mice with specific mutations in immunological genes. The initial study identified a significant and profound increase in multiple ligands for the chemokine receptor CCR2 and an increase in CD44 expression in susceptible C57BL/6 (B6 but not resistant AKR mice. Ccr2(-/- mice were completely protected from hepatitis and Cd44(-/- mice were partially protected. Despite protection from inflammation, both strains displayed similar histological steatosis scores and significant increases in serum liver enzymes. CD45(+CD44(+ cells bound to hyaluronic acid (HA in diet fed B6 mice but not Cd44(-/- or Ccr2(-/- mice. Ccr2(-/- mice displayed a diminished HA binding phenotype most notably in monocytes, and CD8(+ T-cells. In conclusion, this study demonstrates that absence of CCR2 completely and CD44 partially reduces hepatic leukocyte recruitment. These data also provide evidence that there are multiple redundant CCR2 ligands produced during hepatic lipid accumulation and describes the induction of a strong HA binding phenotype in response to LD feeding in some subsets of leukocytes from susceptible strains.

  10. Correlation of matrix metalloproteinase-2, -9, tissue inhibitor-1 of matrix metalloproteinase and CD44 variant 6 in head and neck cancer metastasis

    Institute of Scientific and Technical Information of China (English)

    徐娅苹; 赵学群; SOMMER,K.; MOUBAYED,P.

    2003-01-01

    This study aimed to explore the molecular mechanism in tumor invasion and metastasis. The ex-pression of matrix metalloproteinase-2,-9 (MMP-2,MMP-9), tissue inhibitor-1 of matrix metalloprote inase(TIMP-1) , cell adhesion molecule 44 variant 6 (CD44v6) , HER2/neu and p53 was investigated in 154 pa-tients with head and neck squamous cell carcinoma (SCC) by ABC and ImmunoMax immunohistochemical method. Their clinical relevance and correlation were analysed. The expression of MMP-2, MMP-9, TIMP-1,CD44v6, HER2/neu and p53 was found in cancer cells in 87.01%, 85.71%, 68. 18%, 98.05%,55.19% and 50.65% cases respectively. Linear regression and correlation analysis revealed that there wasclose positive relationship ( P < 0.05) between the expression of MMP-2 and MMP-9, TIMP-1 and CD44v6,HER2/neu and MMP-9, MMP-2 and p53. Up-regulation of MMP-2 was accompanied by advanced T stage( P < 0.01 ) . There was also a trend of MMP-2 expression being related with tumor metastasis. Increased ex-pression of HER2/neu was found in patients with tumor recurrence( P < 0.05 ) . The expression of TIMP-1 washigher in laryngeal cancer than that in pharyngeal cancer, and higher in keratinizing and non-keratlnizing SCC than that in basaloid SCC ( P < 0.05 ) . These findings suggested that MMP-2 and MMP-9, HER2/neu andMMP-9, MMP-2 and p53 had a coordinate function in aggression of tumor; that MMP-2 had a more important function than MMP-9 in tumor invasion and metastasis; and that HER2/neu might serve as a biomarker forpoor prognosis in HNSCC.

  11. Correlation of matrix metalloproteinase-2, -9, tissue inhibitor-1 of matrix metalloproteinase and CD44 variant 6 in head and neck cancer metastasis

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    This study aimed to explore the molecular mechanism in tumor invasion and metastasis. The expression of matrix metalloproteinase-2,-9 (MMP-2, MMP-9), tissue inhibitor-1 of matrix metalloproteinase (TIMP-1), cell adhesion molecule 44 variant 6 (CD44v6), HER2/neu and p53 was investigated in 154 patients with head and neck squamous cell carcinoma (SCC) by ABC and ImmunoMax immunohistochemical method. Their clinical relevance and correlation were analysed. The expression of MMP-2, MMP-9, TIMP-1, CD44v6, HER2/neu and p53 was found in cancer cells in 87.01%, 85.71%, 68.18%, 98.05%, 55.19% and 50.65% cases respectively. Linear regression and correlation analysis revealed that there was close positive relationship (P<0.05) between the expression of MMP-2 and MMP-9, TIMP-1 and CD44v6, HER2/neu and MMP-9, MMP-2 and p53. Up-regulation of MMP-2 was accompanied by advanced T stage(P<0.01). There was also a trend of MMP-2 expression being related with tumor metastasis. Increased expression of HER2/neu was found in patients with tumor recurrence(P<0.05). The expression of TIMP-1 was higher in laryngeal cancer than that in pharyngeal cancer, and higher in keratinizing and non-keratinizing SCC than that in basaloid SCC(P<0.05). These findings suggested that MMP-2 and MMP-9, HER2/neu and MMP-9, MMP-2 and p53 had a coordinate function in aggression of tumor; that MMP-2 had a more important function than MMP-9 in tumor invasion and metastasis; and that HER2/neu might serve as a biomarker for poor prognosis in HNSCC.

  12. Lipid raft association restricts CD44-ezrin interaction and promotion of breast cancer cell migration.

    LENUS (Irish Health Repository)

    Donatello, Simona

    2012-12-01

    Cancer cell migration is an early event in metastasis, the main cause of breast cancer-related deaths. Cholesterol-enriched membrane domains called lipid rafts influence the function of many molecules, including the raft-associated protein CD44. We describe a novel mechanism whereby rafts regulate interactions between CD44 and its binding partner ezrin in migrating breast cancer cells. Specifically, in nonmigrating cells, CD44 and ezrin localized to different membranous compartments: CD44 predominantly in rafts, and ezrin in nonraft compartments. After the induction of migration (either nonspecific or CD44-driven), CD44 affiliation with lipid rafts was decreased. This was accompanied by increased coprecipitation of CD44 and active (threonine-phosphorylated) ezrin-radixin-moesin (ERM) proteins in nonraft compartments and increased colocalization of CD44 with the nonraft protein, transferrin receptor. Pharmacological raft disruption using methyl-β-cyclodextrin also increased CD44-ezrin coprecipitation and colocalization, further suggesting that CD44 interacts with ezrin outside rafts during migration. Conversely, promoting CD44 retention inside lipid rafts by pharmacological inhibition of depalmitoylation virtually abolished CD44-ezrin interactions. However, transient single or double knockdown of flotillin-1 or caveolin-1 was not sufficient to increase cell migration over a short time course, suggesting complex crosstalk mechanisms. We propose a new model for CD44-dependent breast cancer cell migration, where CD44 must relocalize outside lipid rafts to drive cell migration. This could have implications for rafts as pharmacological targets to down-regulate cancer cell migration.

  13. Hyaluronic Acid- Paclitaxel: Antitumor Efficacy against CD44(+ Human Ovarian Carcinoma Xenografts

    Directory of Open Access Journals (Sweden)

    Edmond Auzenne

    2007-06-01

    Full Text Available Numerous human tumor types, including ovarian cancer, display a significant expression of the CD44 family of cell surface proteoglycans. To develop tumortargeted drugs, we have initially evaluated whether the CD44 ligand hyaluronic acid (HA could serve as a backbone for paclitaxel (TXL prodrugs. HA-TXL was prepared by modification of previous techniques. The in vitro cytotoxicity of HA-TXL against the CD44(+ human ovarian carcinoma cell lines SKOV-3ip and NMP-1 could be significantly blocked by preincubation with a molar excess of free HA. Female nude mice bearing intraperitoneal implants of NMP-1 cells were treated intraperitoneally with a single sub-maximum tolerated dose dose of HA-TXL or with multiple-dose regimens of paclitaxel (Taxol; Mead Johnson, Princeton, NJ to determine the effects of these regimens on host survival and intraperitoneal tumor burden, with the latter being assessed by magnetic resonance imaging. NMP-1 xenograffs were highly resistant to Taxol regimens, as host survival was only nominally improved compared to controls (T/C ∼ 120, whereas singledose HA-TXL treatment significantly improved survival in this model (T/C ∼ 140; P = .004. In both NMP-1 and SKOV-3ip models, MR images of abdomens of HA-TXL-treated mice obtained shortly before controls required humane sacrifice revealed markedly reduced tumor burdens compared to control mice. This study is among the first to demonstrate that HA-based prodrugs administered locoregionally have antitumor activity in vivo.

  14. Association of CD44 Polymorphisms with Genetic Susceptibilities and Clinico-pathologic Characteristics in Breast Cancer%CD44基因多态性与乳腺癌遗传易感性及临床病理参数的关系

    Institute of Scientific and Technical Information of China (English)

    周鑫; 吴诚义

    2012-01-01

    Objective To explore the association of CD44 rs4756195 polymorphisms with genetic susceptibilities and clinico-pathologic characteristics to breast cancer of Han Nationality in Chongqing, China. Methods This case-control study included 170 patients with breast cancer and 178 healthy controls, single nucleotide polymorphisms (SNPs) of CD44 rs4756195 polymorphisms at intron 1 were genotyped by Sequenom Mass Array(R) iPLEX GOLD System. Data was analyzed via t test, Chi-square test and Logistic regression analysis. Results The frequencies of genotypes (AA, AG and GG) of CD44 rs4756195 showed a significant difference in the distribution of the genotypes between patients with breast cancer and healthy controls (χz =6. 272,P = 0. 043). The GG and AG genotype significantly increased the risk of breast cancer compared with AA genotype (OR —6. 035, 95%CI: 1.262-28. 856,P = 0. 024;OR = 5. 367,95%CI:1. 166-24. 709,P = 0. 031). The rate of axillary lymph nodes metastasis in patients with breast cancer who carried with GG genotype was higher than those carried with AG and GG genotype (62. 6% vs. 44. 7% , χ2 =4. 473 ,P = 0. 034). The positive rate of CD44 in patients with breast cancer who carried with AG and GG genotype was higher than those carried with GG genotype (68. 1 % vs. 45. 5% , χ2 = 6. 930,P = 0. 008). Conclusion CD44 rs4756195 polymorphisms are closely associated with the increased risk for breast cancer in Han Nationality; AG and GG genotype are susceptible genotype for breast cancer. CD44 rs4756195 polymorphisms are closely associated with the expression of CD44 and axillary lymph nodes metastasis, the patients with breast cancer who carried with GG genotype may have bad prognosis.%目的 探讨CD44基因rs4756195位点多态性与中国重庆地区汉族女性乳腺癌遗传易感性的关系.方法 采用病例对照研究,利用Sequenom MassArray(R) iPLEX GOLD系统检测170例乳腺癌患者和178例健康对照者CD44基因rs4756195位点单核苷酸多

  15. Hyaluronan-CD44 interaction promotes growth of decidual stromal cells in human first-trimester pregnancy.

    Directory of Open Access Journals (Sweden)

    Rui Zhu

    Full Text Available Hyaluronan (HA and its receptor CD44 are expressed at the maternal-fetal interface, but its role in early pregnancy remains unclear. Here, we found that primary decidual stromal cells (DSCs continuously secreted HA and expressed its receptor CD44. Pregnancy-associated hormones up-regulated HA synthetase (HAS 2 transcription and HA release from DSCs. High molecular weight-HA (HMW-HA, but not medium molecular weight (MMW-HA or low molecular weight (LMW-HA, promoted proliferation and inhibited apoptosis of DSCs in a CD44-dependent manner. The in-cell Western analysis revealed HMW-HA activated PI3K/AKT and mitogen-activated protein kinase (MAPK/ERK1/2 signaling pathways time-dependently. Blocking these pathways by specific inhibitor LY294002 or U0126 abrogated HMW-HA-regulated DSc proliferation and apoptosis. Finally, we have found that HA content, HA molecular weight, HAS2 mRNA level, and CD44 expression were significantly decreased in DSCs from unexplained miscarriage compared with the normal pregnancy. Collectively, our results indicate that higher level and greater molecular mass of HA at maternal-fetal interface contributes to DSc growth and maintenance of DSCs in human early pregnancy.

  16. Expresiones del CD44 en tejidos periapicales inflamados.

    OpenAIRE

    Siragusa, Martha; Dietrich, Gustavo; Pisterna, Gabriela; D'Arrigo, Mabel

    2012-01-01

    Recibido: Noviembre 2011 - Aceptado: Marzo 2012 El granuloma periapical es una lesión inflamatoria crónica causada por una infección poli bacteriana. Las moléculas de adhesión del CD44 están fuertemente expresadas en células variadas tales como los leucocitos, células parenquimatosas e incluyendo células endoteliales, en células epiteliales y en células musculares. Tiene interacción con el Acido Hialurónico, con el colágeno, lamininas y fibronectina y juega un rol importante en la migraci...

  17. The natural flavonoid apigenin sensitizes human CD44(+) prostate cancer stem cells to cisplatin therapy.

    Science.gov (United States)

    Erdogan, Suat; Turkekul, Kader; Serttas, Rıza; Erdogan, Zeynep

    2017-04-01

    Prostate cancer (PCa) is the second most common type of cancer and the fifth leading cause of cancer-related death among men. Development of chemoresistance, tumor relapse and metastasis remain major barriers to effective treatment and all been identified to be associated with cancer stem cells (CSCs). Natural flavonoids such as apigenin have been shown to have the ability to improve the therapeutic efficacy of common chemotherapy agents through CSCs sensitization. Thus, the aim of this study was to evaluate the combination of apigenin with cisplatin on CD44(+) PCa stem cell growth and migration. Platinum-based anti-neoplastic drugs have been used to treat a number of malignancies including PCa. However, acquired resistance and side effects unfortunately have limited cisplatin's use. A CD44(+) subpopulation was isolated from human androgen-independent PC3 PCa cells by using human CD44-PE antibody. IC50 values were determined by MTT test. RT-qPCR, Western blot analyses and image-based cytometer were used to investigate apoptosis, cell cycle and their underlying molecular mechanisms. Cell migration was evaluated by wound healing test. The combination of the IC50 doses of apigenin (15μM) and cisplatin (7.5μM) for 48h significantly enhanced cisplatin's cytotoxic and apoptotic effects through downregulation of Bcl-2, sharpin and survivin; and upregulation of caspase-8, Apaf-1 and p53 mRNA expression. The combined therapy suppressed the phosphorylation of p-PI3K and p-Akt, inhibited the protein expression of NF-κB, and downregulated the cell cycle by upregulating p21, as well as cyclin dependent kinases CDK-2, -4, and -6. Apigenin significantly increased the inhibitory effects of cisplatin on cell migration via downregulation of Snail expression. In conclusion, our study showed the possible therapeutic approach of using apigenin to potentially increase the effects of cisplatin by targeting CSCs subset in prostate cancer.

  18. 人胆管癌CD24+ CD44+ EpCAMhigh细胞亚群的分选及其肿瘤干细胞样特性的鉴定%Sorting of CD24+ CD44+ EpCAMhigh subset cells in human human cholangiocardnoma and the identificantion of their cancer stem cell-like properties

    Institute of Scientific and Technical Information of China (English)

    朱峰; 王敏; 秦仁义; 申铭; 王欣; 田锐; 江建新; 石程剑

    2010-01-01

    Objective To sort CD24+ CD44+ EpCAMhigh subset cells in human cholangiocarcinoma and identify their cancer stem cell-like properties. Methods The expression and rate of CD24, CD44 and EpCAM in 6 cases of human cholangiocacinomas were assayed by flow cytometry. The fresh specimens from two cases of cholangiocarcinoma were obtained and implanted subcutaneously into NOD/SCID mice for the establishment of xenografts model. CD24+ CD44+ EpCAMhigh subset cells were sorted from xenografts by flow cytometry and their tumorigenic potential, self-renewal ability and differentiation ability were assessed. Results The expression rate of CD24+ CD44+ EpCAMhigh cells ranged from 0. 58% to 2.43% (mean= 0. 94% ) in 6 cholangiocarcinoma specimens and 2 xenografts. CD24+ CD44+ EpCAMhigh subset cells sorted from 2 xenografts were found to be highly tumorigenic in NOD/SCID mice. CD24+ CD44+ EpCAMhigh cells consistently formed tumors with 1000 cells in 3/8 mice. In contrast, CD24+ CD44+ EpCAMhigh tumor cells were less tumorigenic and formed tumors with 50 000 cells in 1/8 mice. CD24+ CD44+ EpCAMhigh cells were passaged in NOD/SCID mice and formed tumors that recapitulated the histological features and heterogeneity of the original patient tumor. Conclusion CD24+ CD44+ EpCAMhigh subset cells were discriminated in human cholangiocarcinoma, and they had highly tumorigenic, self-renewal ability and differentiation ability. It was first confirmed that CD24+ CD44+ EpCAMhigh cells may be human cholangiocarcinoma cancer stem cells.%目的 检测及分选人胆管癌中的CD24+ CD44+ EpCAMhigh细胞亚群,探讨其是否具有肿瘤干细胞样生物学特性.方法 流式细胞术检测6例人胆管癌中CD24、CD44、EpCAM的表达率;取2例人胆管癌新鲜标本种植到NOD/SCID鼠皮下,建立荷人胆管癌小鼠模型.流式细胞术分选CD24+ CD44+ EpCAMhigh亚群细胞,NOD/SCID鼠移植瘤试验鉴定其成瘤和分化能力.结果 6例人胆管癌组织标本和2例移植瘤中,CD24

  19. Heparan sulfate proteoglycan isoforms of the CD44 hyaluronan receptor induced in human inflammatory macrophages can function as paracrine regulators of fibroblast growth factor action.

    Science.gov (United States)

    Jones, M; Tussey, L; Athanasou, N; Jackson, D G

    2000-03-17

    The CD44 glycoprotein is expressed in multiple isoforms on a variety of cell types where it functions as a receptor for hyaluronan-mediated motility. Recently, interest has centered on CD44 heparan sulfate proteoglycan (HSPG) isoforms because of their potential to sequester heparin-binding growth factors and chemokines. Expression of these isoforms on ectodermal cells has recently been shown to regulate limb morphogenesis via presentation of fibroblast growth factor (FGF) 4/FGF 8 while expression on tumor cells was shown to sequester hepatocyte growth factor and promote tumor dissemination. To date, however, CD44 HSPG expression in tissue macrophages and lymphocytes has not been adequately investigated, despite the fact these cells actively synthesize growth factors and chemokines and indirect evidence that monocyte CD44 sequesters macrophage inflammatory protein-1beta. Here we show primary human monocytes rather than lymphocytes express CD44 HSPGs, but only following in vitro differentiation to macrophages or activation with the proinflammatory cytokine interleukin-1alpha or bacterial lipopolysaccharide. Furthermore, we show these isoforms are preferentially modified with heparan rather than chondroitin sulfate, bind the macrophage-derived growth factors FGF-2, vascular endothelial growth factor, and heparin-binding epidermal growth factor with varying affinities (K(d) 25-330 nM) and in the case of FGF-2, can stimulate productive binding to the high affinity tyrosine kinase FGF receptor 1 (FGFR1). In contrast, we find no evidence for significant binding to C-C chemokines. Last, we confirm by immunofluorescent antibody staining that inflamed synovial membrane macrophages express CD44 HSPGs and that expression is greatest in cells containing high FGF-2 levels. These results suggest a paracrine role for macrophage CD44 HSPG isoforms in the regulation of growth factor action during inflammation.

  20. Evaluation of cancer stem cell markers CD133, CD44, CD24: association with AKT isoforms and radiation resistance in colon cancer cells.

    Directory of Open Access Journals (Sweden)

    Sara Häggblad Sahlberg

    Full Text Available The cell surface proteins CD133, CD24 and CD44 are putative markers for cancer stem cell populations in colon cancer, associated with aggressive cancer types and poor prognosis. It is important to understand how these markers may predict treatment outcomes, determined by factors such as radioresistance. The scope of this study was to assess the connection between EGFR, CD133, CD24, and CD44 (including isoforms expression levels and radiation sensitivity, and furthermore analyze the influence of AKT isoforms on the expression patterns of these markers, to better understand the underlying molecular mechanisms in the cell. Three colon cancer cell-lines were used, HT-29, DLD-1, and HCT116, together with DLD-1 isogenic AKT knock-out cell-lines. All three cell-lines (HT-29, HCT116 and DLD-1 expressed varying amounts of CD133, CD24 and CD44 and the top ten percent of CD133 and CD44 expressing cells (CD133high/CD44high were more resistant to gamma radiation than the ten percent with lowest expression (CD133low/CD44low. The AKT expression was lower in the fraction of cells with low CD133/CD44. Depletion of AKT1 or AKT2 using knock out cells showed for the first time that CD133 expression was associated with AKT1 but not AKT2, whereas the CD44 expression was influenced by the presence of either AKT1 or AKT2. There were several genes in the cell adhesion pathway which had significantly higher expression in the AKT2 KO cell-line compared to the AKT1 KO cell-line; however important genes in the epithelial to mesenchymal transition pathway (CDH1, VIM, TWIST1, SNAI1, SNAI2, ZEB1, ZEB2, FN1, FOXC2 and CDH2 did not differ. Our results demonstrate that CD133high/CD44high expressing colon cancer cells are associated with AKT and increased radiation resistance, and that different AKT isoforms have varying effects on the expression of cancer stem cell markers, which is an important consideration when targeting AKT in a clinical setting.

  1. ETS-1-mediated transcriptional up-regulation of CD44 is required for sphingosine-1-phosphate receptor subtype 3-stimulated chemotaxis.

    Science.gov (United States)

    Zhang, Wenliang; Zhao, Jiawei; Lee, Jen-Fu; Gartung, Allison; Jawadi, Hiba; Lambiv, Wanyu Louis; Honn, Kenneth V; Lee, Menq-Jer

    2013-11-08

    Sphingosine-1-phosphate (S1P)-regulated chemotaxis plays critical roles in various physiological and pathophysiological conditions. S1P-regulated chemotaxis is mediated by the S1P family of G-protein-coupled receptors. However, molecular details of the S1P-regulated chemotaxis are incompletely understood. Cultured human lung adenocarcinoma cell lines abundantly express S1P receptor subtype 3 (S1P3), thus providing a tractable in vitro system to characterize molecular mechanism(s) underlying the S1P3 receptor-regulated chemotactic response. S1P treatment enhances CD44 expression and induces membrane localization of CD44 polypeptides via the S1P3/Rho kinase (ROCK) signaling pathway. Knockdown of CD44 completely diminishes the S1P-stimulated chemotaxis. Promoter analysis suggests that the CD44 promoter contains binding sites of the ETS-1 (v-ets erythroblastosis virus E26 oncogene homolog 1) transcriptional factor. ChIP assay confirms that S1P treatment stimulates the binding of ETS-1 to the CD44 promoter region. Moreover, S1P induces the expression and nuclear translocation of ETS-1. Knockdown of S1P3 or inhibition of ROCK abrogates the S1P-induced ETS-1 expression. Furthermore, knockdown of ETS-1 inhibits the S1P-induced CD44 expression and cell migration. In addition, we showed that S1P3/ROCK signaling up-regulates ETS-1 via the activity of JNK. Collectively, we characterized a novel signaling axis, i.e., ROCK-JNK-ETS-1-CD44 pathway, which plays an essential role in the S1P3-regulated chemotactic response.

  2. CD44+/CD24-细胞在乳腺癌组织及细胞系中的数量与分布%Quantity and distribution of CD44+/CD24-cells in breast cancer tissue and the cell lines

    Institute of Scientific and Technical Information of China (English)

    吕新全; Zhenhe Suo; 马长路; 徐珂佳; 刘羿杉; 李惠翔

    2009-01-01

    Objective To study the distribution and quantity of CD44VCD24- cells in breast cancer tissue and the cell lines,and as well as its correlation with the expression of various breast cancer markers and molecular subtyping of breast carcinoma.Methods The expression of CD44 / CD24,estrogen receptor,progesterone receptor,HER2,human estrogen-induced protein PS2,bcl-2 and nm23 in 60 cases of invasive ductal carcinoma of breast were studied by either single or double immunohistochemical staining.The co-expression of CD44 and CD24 in 3 breast cancer cell lines (MCF-7,MDA-MB-468,and MDA-MB- 231) was also examined.Results The quantity and distribution of CD44 + /CD24- cells varied greatly and no specific patterns were identified.The percentage of CD44 + /CD24- in breast cancer was 65%.The amount of CD44+/CD24- cells did not correlate with the age of patients,lymph node metastasis,tumor  size,molecular subtypes and expression of various breast cancer markers in breast carcinoma.The proportion of CD44+/CD24- cells in MCF-7,MDA-MB-468,and MDA-MB-231 cell lines was 80% ,respectively.Conclusions CD44+ /CD24- cells are demonstrated in certain breast cancer tissues and cell lines.However,there is no relationship obtained between the quantity or the distribution of these cells and the molecular subtyping or the clinicopathologic parameters in breast cancer.%目的 检测CD44+/CIY24-细胞在乳腺癌组织及细胞系中的分布及数量,探讨其与乳腺癌常用标志物表达和乳腺癌分子亚型的关系.方法 采用免疫组织化学SP双染及单染法,分别检测了60例乳腺浸润性导管癌中的CD44及C1724的共表达情况和ER、PR、HER2、人雌激素诱导蛋白PS2、bcl-2、nm23的单独表达情况,同时检测了三种乳腺痛细胞系(MCF-7、MDA-MB-468及MDA-MB-231)中CD44及CD24的表达情况.结果 不同病例标本中CD44+/C1724-细胞的数量差异较大,分布无明显规律,总阳性率为65.0%;CD44+/CD24-细胞数量与患者年龄、肿瘤

  3. 结直肠腺癌组织中CD44+/Oct4+癌干细胞的形态及分布%Morphology and distribution of CD44+/Oct4+colorectal cancer stem cells

    Institute of Scientific and Technical Information of China (English)

    张登才; 刘斌; 张丽华; 张彩兰; 杨艳丽; 苏勤军; 史敏; 董亮; 哈英娣

    2013-01-01

    背景:越来越多的证据显示 CD44可作为结直肠腺癌干细胞的一个特异性的标志物,近年发现胚胎干细胞转录因子Oct4在结直肠腺癌中有表达。  目的:观察CD44+/Oct4+细胞在原发性结直肠腺癌组织中的数量、位置及分布方式。  方法:取108例结直肠腺癌、18例癌旁正常肠黏膜组织及18例伴不典型增生的结直肠腺瘤标本制成48点共3块组织芯片,应用免疫组织化学双重染色和苏木精-伊红染色,定位CD44+/Oct4+肿瘤细胞,观察计数并在苏木精-伊红切片的对应位置上观察其形态特征。  结果与结论:免疫组织化学双重染色结果显示,癌旁正常肠黏膜中未见CD44+/Oct4+细胞,在伴不典型增生的腺瘤中可见极少量CD44+/Oct4+细胞,结直肠腺癌中可见到少量CD44+/Oct4+细胞。双阳性细胞主要分布在腺管样结构基底膜侧或共壁腺体的共壁侧,呈小灶状或散在点状分布;细胞呈卵圆形或立方状,胞浆稀少,胞核规则,均质深染,呈卵圆形或高柱状。其数量与结直肠癌分化程度呈负相关(r=-0.579,P OBJECTIVE:To investigate the quantity, location and distribution of CD44+/Oct4+cells in primary colorectal carcinoma. METHODS:A total y of 108 cases of human colorectal carcinoma and 18 cases of normal mucosa, 18 cases of adenoma were col ected and made into three tissue microarrays, each containing of 48 dots. The locations of CD44+/Oct4+cells were detected by double-label immunohistochemical staining and hematoxylin-eosin staining. The morphologic features of them were investigated on hematoxylin-eosin staining at the same position.  RESULTS AND CONCLUSION:The results of double-label immunohistochemical staining demonstrated that there were no CD44+/Oct4+cells in normal intestine mucosa and a very smal amount of CD44+/Oct4+cells in adenoma, and double-positive cells could also be seen in colorectal carcinoma. The number of CD

  4. Identification of the Molecular Mechanisms Responsible for the Inhibition of Homing of AML Cells Triggered by CD44-Ligation

    KAUST Repository

    Al-Jifri, Ablah

    2011-08-03

    Acute Myeloid Leukemia (AML) is a cancerous disease that is defined by the inability to produce functional and mature blood cells, as well as the uncontrolled proliferation due to failure to undergo apoptosis of abnormal cells. The most common therapy for Leukemia, chemotherapy, has proven only to be partially efficient since it does not target the leukemic stem cells (LSCs) that have a high self-renewal and repopulation capacity and result in remission of the disease. Therefore targeting LSCs will provide more efficient therapy. One way to achieve this would be to inhibit their homing capability to the bone marrow. It has recently been shown that CD44, an adhesive molecule, plays a crucial role in cell trafficking and lodgement of both normal and leukemic stem cells. More importantly anti-CD44 monoclonal antibodies, along with its ability to induce differentiation of leukemic blasts, it inhibits specifically the homing capacity of LSCs to their micro-environmental niches. However, these molecular mechanisms that underlie the inhibition of homing have yet to be determined. To address these questions we conducted in vitro adhesion and blot-rolling assays to analyze the adherence and rolling capacity of these LSCs before and after treatment with anti-CD44 monoclonal antibody (mAb). Since glycosyltransferases play a crucial role in post translational carbohydrate decoration on adhesion molecules, we analyzed the expression (using quantitative PCR) of the different glycosyltransferases expressed in LSC\\'s before and after CD44 ligation (mAb treatment). Furthermore, we analyzed differentiation by flow cytometric analysis of treated and non-treated LSC\\'s. We anticipate that our results will set forth new insights into targeted therapies for AML.

  5. Utility of a triple antibody cocktail intraurothelial neoplasm-3 (IUN-3-CK20/CD44s/p53) and α-methylacyl-CoA racemase (AMACR) in the distinction of urothelial carcinoma in situ (CIS) and reactive urothelial atypia.

    Science.gov (United States)

    Aron, Manju; Luthringer, Daniel J; McKenney, Jesse K; Hansel, Donna E; Westfall, Danielle E; Parakh, Rugvedita; Mohanty, Sambit K; Balzer, Bonnie; Amin, Mahul B

    2013-12-01

    Urothelial carcinoma in situ (CIS) is a prognostically and therapeutically significant lesion with considerable morphologic overlap with reactive conditions especially in the setting of prior therapy. Various markers including CK20, CD44s, and p53 have been used as an adjunct in making this distinction; however, the utility of these markers in the posttreatment scenario is not fully established. α-Methylacyl-CoA racemase (AMACR) is a tumor-associated marker that is expressed in a subset of high-grade urothelial carcinomas but has not been studied in CIS. This study was undertaken to evaluate the immunoreactivity of CK20, CD44s, and p53 as a triple antibody cocktail intraurothelial neoplasm-3 (IUN-3) in distinguishing CIS from its mimics and to compare its utility with AMACR in the diagnosis of CIS. A total of 135 specimens (7 benign ureters and 128 bladder biopsies-28 reactive, 33 posttherapy reactive, 43 CIS, 24 CIS posttherapy) were included in this study. Immunostaining for p53 (brown, nuclear), CD44s (brown, membranous), and CK20 (red, cytoplasmic and membranous) was performed as a cocktail, and the staining pattern was further classified as: malignant (full-thickness CK20 and/or full-thickness p53 with CD44s negativity), reactive/benign (CK20 limited to the umbrella cell layer, p53 negative, and CD44s positivity ranging from basal to full thickness), and indeterminate (CK20 and p53 positive but not full thickness and/or CD44s positive). AMACR staining was performed in 50 cases. Cytoplasmic staining for AMACR was graded as negative (absent to weak focal staining [<5% cells]) and positive (≥5%). The "IUN-3 malignant" pattern was observed in 84% of cases of CIS without a history of prior therapy and in 71% of the cases of CIS with a history of prior therapy. Cases with posttherapy reactive atypia showed an "IUN-3 reactive" pattern in 84% cases and "IUN-3 indeterminate" pattern in 16% of the cases; the IUN-3 malignant pattern was not identified in any of the

  6. 乳腺癌外周血微转移hSBEM mRNA和CD44V6 mRNA的检测%The detection of micrometastases in the peripheral blood of patients with breast cancer for hSBEM mRNA and CD44V6 mRNA

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Objective:Successful treatment of breast cancer greatly depends on the early detection of its metastasis, therefore a sensitive and specific biomarker for detecting dissemination of the cancer cells will help to achieve this goal. This study was to evaluate the prognostic significance of human small breast epithelial mucin (hSBEM) and CD44V6 in breast cancer. Methods: The expressions of hSBEM mRNA and CD44V6 mRNA were detected with nested reverse transcription polymerase chain reaction (nested RT-PCR) in 67 samples of breast cancer and adjacent normal breast tissue, 16 samples of breast benign lesions tissue, and 67 specimens of peripheral blood from patients with breast cancer, 16 specimens of benign breast lesions, 20 specimens of healthy volunteers, and 25 (each five cases) other carcinomas tissue samples, including those of gastric carcinoma, colorectal carcinoma, esophageal carcinoma, lung carcinoma, and ovary carcinoma, were analyzed for hSBEM mRNA expression by nested RT-PCR. Results: hSBEM mRNA expression was observed in 62/67 (92.54%)of breast cancer, 14/16 (87.50%) of breast benign lesions and 59/67 (88.05%) of normal breast tissue, with no significant differences between them (P>0.05). None of the samples from other cancer tissues were positive. In peripheral blood the expression of hSBEM mRNA was detected in 34/67 (50.75%) from patients with breast cancer, with significant increasing (P< 0.05) in the cases of metastatic disease (stage Ⅳ) and those with lymph node metastasis compared with localized disease (stage Ⅰ, Ⅱ and Ⅲ) and without lymph node metastasis, but its expression was not found in peripheral blood of patients with benign breast lesions or healthy volunteers. Although CD44V6 mRNA was significantly higher in breast cancer than in benign breast lesions tissue and normal breast tissue, its expression in peripheral blood show no significant difference (P>0.05) in the patients with breast cancer (82.09%), benign breast lesion (75

  7. TGF-β reduces DNA ds-break repair mechanisms to heighten genetic diversity and adaptability of CD44+/CD24− cancer cells

    Science.gov (United States)

    Pal, Debjani; Pertot, Anja; Shirole, Nitin H; Yao, Zhan; Anaparthy, Naishitha; Garvin, Tyler; Cox, Hilary; Chang, Kenneth; Rollins, Fred; Kendall, Jude; Edwards, Leyla; Singh, Vijay A; Stone, Gary C; Schatz, Michael C; Hicks, James; Hannon, Gregory J; Sordella, Raffaella

    2017-01-01

    Many lines of evidence have indicated that both genetic and non-genetic determinants can contribute to intra-tumor heterogeneity and influence cancer outcomes. Among the best described sub-population of cancer cells generated by non-genetic mechanisms are cells characterized by a CD44+/CD24− cell surface marker profile. Here, we report that human CD44+/CD24− cancer cells are genetically highly unstable because of intrinsic defects in their DNA-repair capabilities. In fact, in CD44+/CD24− cells, constitutive activation of the TGF-beta axis was both necessary and sufficient to reduce the expression of genes that are crucial in coordinating DNA damage repair mechanisms. Consequently, we observed that cancer cells that reside in a CD44+/CD24− state are characterized by increased accumulation of DNA copy number alterations, greater genetic diversity and improved adaptability to drug treatment. Together, these data suggest that the transition into a CD44+/CD24− cell state can promote intra-tumor genetic heterogeneity, spur tumor evolution and increase tumor fitness. DOI: http://dx.doi.org/10.7554/eLife.21615.001 PMID:28092266

  8. Biotin-conjugated anti-CD44 antibody-avidin binding system for the improvement of chondrocyte adhesion to scaffolds.

    Science.gov (United States)

    Lin, Hong; Zhou, Jian; Shen, Longxiang; Ruan, Yuhui; Dong, Jian; Guo, Changan; Chen, Zhengrong

    2014-04-01

    The clinical need for improved treatment options for patients with cartilage injuries has motivated tissue-engineering studies aimed at the in vitro generation of cell-based implants with functional properties. The success of tissue-engineered repair of cartilage may depend on the rapid and efficient adhesion of transplanted cells to the scaffold. In the present study, chondrocyte-scaffold constructs were engineered by planting porcine chondrocytes into nonporous chitosan membranes and 3D porous chitosan scaffolds that were treated with or without biotin-conjugated anti-CD44 antibody-avidin binding system and avidin-biotin binding system. The spreading area, cell exfoliation rates, cell proliferation rates, histological analysis, DNA and glycosaminoglycan (GAG) content, and mRNA expression were investigated to evaluate the efficiency of biotin-conjugated anti-CD44 antibody-avidin binding system for the improvement of cell adhesion to scaffolds in the cartilage tissue. The results showed that the biotin-conjugated anti-CD44 antibody-avidin binding system improved cell adhesion to scaffolds effectively. These studies suggest that this binding system has the potential to provide improved tissue-engineered cartilage for clinical applications.

  9. Impact of CD44v6 overexpression on invasion and metastasis of colon cancer SW480 cells%过表达CD44v6基因对人大肠癌SW480细胞侵袭迁移能力的影响

    Institute of Scientific and Technical Information of China (English)

    吕林; 刘海光; 张筱骅

    2016-01-01

    目的:研究CD44v6基因过表达对SW480细胞侵袭和迁移能力的影响.方法:慢病毒介导的CD44v6过表达细胞(CD44v6组)和空载体对照细胞(NC组)由前期实验构建,采用荧光显微镜观察增强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)表达、实时荧光定量PCR检测CD44v6 mRNA表达水平、免疫荧光检测Flag标签蛋白三种方法重新鉴定过表达细胞模型;CCK-8法检测细胞增殖活性;划痕试验和Transwell试验检测细胞侵袭和迁移能力.结果:绿色荧光蛋白观察显示细胞转染效率近100%;实时荧光定量PCR显示CD44v6组细胞CD44v6 mRNA表达水平较对照组显著升高(P<0.001);Flag标签蛋白免疫荧光染色显示过表达C D44v6蛋白主要定位于细胞膜.CCK-8结果显示2组细胞增殖无明显差异;划痕试验结果显示CD44v6组细胞划痕愈合指数较对照组显著增高(P<0.05);Transwell试验结果显示CD44v6组细胞迁移和侵袭相关指数均较对照组显著增高(均P<0.05),且CD44v6抗体处理后,CD44v6组细胞迁移和侵袭相关指数均较前显著减低(均P<0.05).结论:CD44v基因过表达能显著增强SW480细胞侵袭和迁移能力.%AIM:To investigate the impact of CD44v6 overexpression on the invasion and metastasis of human colon cancer SW480 cells.METHODS:SW480 cells stably overexpressing CD44v6 (CD44v6 group) and negative control cells (NC group) were developed through lentivirus infection.Transfection efficiency was evaluated by detecting the expression of enhanced green fluorescent protein (EGFP).CD44v6 mRNA levels were determined using quantitative real-time PCR.Localization of the overexpressed protein was observed by immunofluorescence staining of Flag protein.Cell proliferation was determined by cell counting kit (CCK)-8 assay.Cell invasion and metastasis were examined by scratch assay and transwell assay.RESULTS:EGFP detection indicated that transfection efficiency was close to 100% in both groups.CD

  10. CD44v6与乳腺癌的研究进展%The development research of CD44v6 and breast cancer

    Institute of Scientific and Technical Information of China (English)

    朱慧芳

    2011-01-01

    CD44v6与肿瘤侵袭和转移密切相关,被认为是肿瘤的特征性和早期指标.乳腺癌是女性常见的恶性肿瘤,近年来发病率和死亡率逐年上升.对其进行深入研究对乳腺肿瘤的诊断及预后具有重大意义.%The CD44v6 protein is closely related with invasion and metastasis of the neoplasm. It is considered as a marker and early indicator of the neoplasm. Breast cancer is a common malignant tumor among women, of which mobility rate and death rate are increasing in recent years. The in-depLh study on CD44v6 will be a great significance in diagnosis and prognosis of the breast cancer.

  11. Nuclear β-catenin and CD44 upregulation characterize invasive cell populations in non-aggressive MCF-7 breast cancer cells

    Directory of Open Access Journals (Sweden)

    Uchino Masahiro

    2010-08-01

    Full Text Available Abstract Background In breast cancer cells, the metastatic cell state is strongly correlated to epithelial-to-mesenchymal transition (EMT and the CD44+/CD24- stem cell phenotype. However, the MCF-7 cell line, which has a luminal epithelial-like phenotype and lacks a CD44+/CD24- subpopulation, has rare cell populations with higher Matrigel invasive ability. Thus, what are the potentially important differences between invasive and non-invasive breast cancer cells, and are the differences related to EMT or CD44/CD24 expression? Methods Throughout the sequential selection process using Matrigel, we obtained MCF-7-14 cells of opposite migratory and invasive capabilities from MCF-7 cells. Comparative analysis of epithelial and mesenchymal marker expression was performed between parental MCF-7, selected MCF-7-14, and aggressive mesenchymal MDA-MB-231 cells. Furthermore, using microarray expression profiles of these cells, we selected differentially expressed genes for their invasive potential, and performed pathway and network analysis to identify a set of interesting genes, which were evaluated by RT-PCR, flow cytometry or function-blocking antibody treatment. Results MCF-7-14 cells had enhanced migratory and invasive ability compared with MCF-7 cells. Although MCF-7-14 cells, similar to MCF-7 cells, expressed E-cadherin but neither vimentin nor fibronectin, β-catenin was expressed not only on the cell membrane but also in the nucleus. Furthermore, using gene expression profiles of MCF-7, MCF-7-14 and MDA-MB-231 cells, we demonstrated that MCF-7-14 cells have alterations in signaling pathways regulating cell migration and identified a set of genes (PIK3R1, SOCS2, BMP7, CD44 and CD24. Interestingly, MCF-7-14 and its invasive clone CL6 cells displayed increased CD44 expression and downregulated CD24 expression compared with MCF-7 cells. Anti-CD44 antibody treatment significantly decreased cell migration and invasion in both MCF-7-14 and MCF-7-14 CL6

  12. CD44v6、CD44v7与炎症性肠病关系的研究进展

    Institute of Scientific and Technical Information of China (English)

    单国栋; 季峰

    2004-01-01

    CD44又称Hermes抗原、人类白细胞粘附分子(huaman cellular adhesive p85 molecule,HCAM)、淋巴细胞归巢受体和细胞外基质Ⅲ型受体(extracellular matrix receptorⅢ,ECM-Ⅲ)等,是一组细胞表面的糖蛋白,介导细胞-细胞、细胞-细胞外基质的相互作用。CD44基因由至少20个外显子

  13. CD44 targeted chemotherapy for co-eradication of breast cancer stem cells and cancer cells using polymeric nanoparticles of salinomycin and paclitaxel.

    Science.gov (United States)

    Muntimadugu, Eameema; Kumar, Rajendra; Saladi, Shantikumar; Rafeeqi, Towseef Amin; Khan, Wahid

    2016-07-01

    This combinational therapy is mainly aimed for complete eradication of tumor by killing both cancer cells and cancer stem cells. Salinomycin (SLM) was targeted towards cancer stem cells whereas paclitaxel (PTX) was used to kill cancer cells. Drug loaded poly (lactic-co-glycolic acid) nanoparticles were prepared by emulsion solvent diffusion method using cationic stabilizer. Size of the nanoparticles (below 150nm) was determined by dynamic light scattering technique and transmission electron microscopy. In vitro release study confirmed the sustained release pattern of SLM and PTX from nanoparticles more than a month. Cytotoxicity studies on MCF-7 cells revealed the toxicity potential of nanoparticles over drug solutions. Hyaluronic acid (HA) was coated onto the surface of SLM nanoparticles for targeting CD44 receptors over expressed on cancer stem cells and they showed the highest cytotoxicity with minimum IC50 on breast cancer cells. Synergistic cytotoxic effect was also observed with combination of nanoparticles. Cell uptake studies were carried out using FITC loaded nanoparticles. These particles showed improved cellular uptake over FITC solution and HA coating further enhanced the effect by 1.5 folds. CD44 binding efficiency of nanoparticles was studied by staining MDA-MB-231 cells with anti CD44 human antibody and CD44(+) cells were enumerated using flow cytometry. CD44(+) cell count was drastically decreased when treated with HA coated SLM nanoparticles indicating their efficiency towards cancer stem cells. Combination of HA coated SLM nanoparticles and PTX nanoparticles showed the highest cytotoxicity against CD44(+) cells. Hence combinational therapy using conventional chemotherapeutic drug and cancer stem cell inhibitor could be a promising approach in overcoming cancer recurrence due to resistant cell population.

  14. Transforming growth factor-β1 induces EMT by the transactivation of epidermal growth factor signaling through HA/CD44 in lung and breast cancer cells.

    Science.gov (United States)

    Li, Lingmei; Qi, Lisha; Liang, Zhijie; Song, Wangzhao; Liu, Yanxue; Wang, Yalei; Sun, Baocun; Zhang, Bin; Cao, Wenfeng

    2015-07-01

    Epithelial-mesenchymal transition (EMT), a process closely related to tumor development, is regulated by a variety of signaling pathways and growth factors, such as transforming growth factor-β1 (TGF-β1) and epidermal growth factor (EGF). Hyaluronan (HA) has been shown to induce EMT through either TGF-β1 or EGF signaling and to be a regulator of the crosstalk between these two pathways in fibroblasts. In this study, in order to clarify whether HA has the same effect in tumor cells, we utilized the lung cancer cell line, A549, and the breast cancer cell line, MCF-7, and found that the effects of stimulation with TGF-β1 were more potent than those of EGF in regulating the expression of EMT-associated proteins and in enhancing cell migration and invasion. In addition, we observed that TGF-β1 activated EGF receptor (EGFR) and its downstream AKT and extracellular signal-regulated kinase (ERK) pathways. Furthermore, we found that TGF-β1 upregulated the expression of hyaluronan synthases (HAS1, HAS2 and HAS3) and promoted the expression of CD44, a cell surface receptor for HA, which interacts with EGFR, resulting in the activation of the downstream AKT and ERK pathways. Conversely, treatment with 4-methylumbelliferone (4-MU; an inhibitor of HAS) prior to stimulation with TGF-β1, inhibited the expression of CD44 and EGFR, abolished the interaction between CD44 and EGFR. Furthermore, the use of shRNA targeting CD44 impaired the expression of EGFR, deactivated the AKT and ERK pathways, reversed EMT and decreased the migration and invasion ability of cells. In conclusion, our data demonstrate that TGF-β1 induces EMT by the transactivation of EGF signaling through HA/CD44 in lung and breast cancer cells.

  15. Activation of VCAM-1 and Its Associated Molecule CD44 Leads to Increased Malignant Potential of Breast Cancer Cells

    Directory of Open Access Journals (Sweden)

    Pei-Chen Wang

    2014-02-01

    Full Text Available VCAM-1 (CD106, a transmembrane glycoprotein, was first reported to play an important role in leukocyte adhesion, leukocyte transendothelial migration and cell activation by binding to integrin VLA-1 (α4β1. In the present study, we observed that VCAM-1 expression can be induced in many breast cancer epithelial cells by cytokine stimulation in vitro and its up-regulation directly correlated with advanced clinical breast cancer stage. We found that VCAM-1 over-expression in the NMuMG breast epithelial cells controls the epithelial and mesenchymal transition (EMT program to increase cell motility rates and promote chemoresistance to doxorubicin and cisplatin in vitro. Conversely, in the established MDAMB231 metastatic breast cancer cell line, we confirmed that knockdown of endogenous VCAM-1 expression reduced cell proliferation and inhibited TGFβ1 or IL-6 mediated cell migration, and increased chemosensitivity. Furthermore, we demonstrated that knockdown of endogenous VCAM-1 expression in MDAMB231 cells reduced tumor formation in a SCID xenograft mouse model. Signaling studies showed that VCAM-1 physically associates with CD44 and enhances CD44 and ABCG2 expression. Our findings uncover the possible mechanism of VCAM-1 activation facilitating breast cancer progression, and suggest that targeting VCAM-1 is an attractive strategy for therapeutic intervention.

  16. Dual-targeting hybrid nanoparticles for the delivery of SN38 to Her2 and CD44 overexpressed human gastric cancer

    Science.gov (United States)

    Yang, Zhe; Luo, Huiyan; Cao, Zhong; Chen, Ya; Gao, Jinbiao; Li, Yingqin; Jiang, Qing; Xu, Ruihua; Liu, Jie

    2016-06-01

    Gastric cancer (GC), particularly of the type with high expression of both human epidermal growth factor receptor 2 (Her2) and cluster determinant 44 (CD44), is one of the most malignant human tumors which causes a high mortality rate due to rapid tumor growth and metastasis. To develop effective therapeutic treatments, a dual-targeting hybrid nanoparticle (NP) system was designed and constructed to deliver the SN38 agent specifically to human solid gastric tumors bearing excessive Her2 and CD44. The hybrid NPs consist of a particle core made of the biodegradable polymer PLGA and a lipoid shell prepared by conjugating the AHNP peptides and n-hexadecylamine (HDA) to the carboxyl groups of hyaluronic acid (HA). Upon encapsulation of the SN38 agent in the NPs, the AHNP peptides and HA on the NP surface allow preferential delivery of the drug to gastric cancer cells (e.g., HGC27 cells) by targeting Her2 and CD44. Cellular uptake and in vivo biodistribution experiments verified the active targeting and prolonged in vivo circulation properties of the dual-targeting hybrid NPs, leading to enhanced accumulation of the drug in tumors. Furthermore, the anti-proliferation mechanism studies revealed that the inhibition of the growth and invasive activity of HGC27 cells was not only attributed to the enhanced cellular uptake of dual-targeting NPs, but also benefited from the suppression of CD44 and Her2 expression by HA and AHNP moieties. Finally, intravenous administration of the SN38-loaded dual-targeting hybrid NPs induced significant growth inhibition of HGC27 tumor xenografted in nude mice compared with a clinical antitumor agent, Irinotecan (CPT-11), and the other NP formulations. These results demonstrate that the designed dual-targeting hybrid NPs are promising for targeted anti-cancer drug delivery to treat human gastric tumors over-expressing Her2 and CD44.Gastric cancer (GC), particularly of the type with high expression of both human epidermal growth factor receptor

  17. Reactivation from latency displays HIV particle budding at plasma membrane, accompanying CD44 upregulation and recruitment

    Directory of Open Access Journals (Sweden)

    Sano Kouichi

    2009-07-01

    Full Text Available Abstract Background It has been accepted that HIV buds from the cell surface in T lymphocytes, whereas in macrophages it buds into intracellular endosomes. Recent studies, on the other hand, suggest that HIV preferentially buds from the cell surface even in monocytic cells. However, most studies are based on observations in acutely infected cells and little is known about HIV budding concomitant with reactivation from latency. Such studies would provide a better understanding of a reservoir for HIV. Results We observed HIV budding in latently infected T lymphocytic and monocytic cell lines following TNF-α stimulation and examined the upregulation of host factors that may be involved in particle production. Electron microscopy analysis revealed that reactivation of latently infected J1.1 cells (latently infected Jurkat cells with HIV-1 and U1 cells (latently infected U937 cells with HIV-1 displayed HIV particle budding predominantly at the plasma membrane, a morphology that is similar to particle budding in acutely infected Jurkat and U937 cells. When mRNA expression levels were quantified by qRT-PCR, we found that particle production from reactivated J1.1 and U1 cells was accompanied by CD44 upregulation. This upregulation was similarly observed when Jurkat and U937 cells were acutely infected with HIV-1 but not when just stimulated with TNF-α, suggesting that CD44 upregulation was linked with HIV production but not with cell stimulation. The molecules in endocytic pathways such as CD63 and HRS were also upregulated when U1 cells were reactivated and U937 cells were acutely infected with HIV-1. Confocal microscopy revealed that these upregulated host molecules were recruited to and accumulated at the sites where mature particles were formed at the plasma membrane. Conclusion Our study indicates that HIV particles are budded at the plasma membrane upon reactivation from latency, a morphology that is similar to particle budding in acute

  18. Nitric oxide inhibits the accumulation of CD4+CD44hiTbet+CD69lo T cells in mycobacterial infection

    Science.gov (United States)

    Pearl, John E.; Torrado, Egidio; Tighe, Michael; Fountain, Jeffrey J.; Solache, Alejandra; Strutt, Tara; Swain, Susan; Appelberg, Rui; Cooper, Andrea M

    2013-01-01

    Summary Animals lacking the inducible nitric oxide synthase gene (nos2−/−) are less susceptible to M. avium strain 25291 and lack nitric oxide-mediated immunomodulation of CD4+ T cells. Here we show that the absence of nos2 results in increased accumulation of neutrophils and both CD4+ and CD8+ T cells within the M. avium-containing granuloma. Examination of the T-cell phenotype in M. avium-infected mice demonstrated that CD4+CD44hi effector T cells expressing the Th1 transcriptional regulator T-bet (T-bet+) were specifically reduced by the presence of nitric oxide. Importantly, the T-bet+ effector population could be separated into CD69hi and CD69lo populations, with the CD69lo population only able to accumulate during chronic infection within infected nos2−/− mice. Transcriptomic comparison between CD4+CD44hiCD69hi and CD4+CD44hiCD69lo populations revealed that CD4+CD44hiCD69lo cells had higher expression of the integrin itgb1/itga4 (VLA-4, CD49d/CD29). Inhibition of Nos2 activity allowed increased accumulation of the CD4+CD44hiT-bet+CD69lo population in WT mice as well as increased expression of VLA-4. These data support the hypothesis that effector T cells in mycobacterial granulomata are not a uniform effector population but exist in distinct subsets with differential susceptibility to the regulatory effects of nitric oxide. PMID:22890814

  19. CD44+CD24-Λow乳腺癌干细胞的流式分选及其肿瘤干细胞特性的初步鉴定%Isolation and Preliminary Characterization of CD44+CD24-Λow Human Breast Cancer Stem Cells

    Institute of Scientific and Technical Information of China (English)

    王玲燕; 王斌; 马清华; 金泗虎; 高红伟; 李素波; 卞修武; 宫锋

    2012-01-01

    Objective: To enrich breast cancer stem cells through fluorescence-activated cell sorting and verify their biological characteristics of the cells. Methods: CD44+CD24-△oW subset cells were sorted and measured by flow cytometry,and the expressions of Oct-4,SOX-2,CK-18 and a-SMA were detected by immunostaining. Results: Flow cytometry analysis indicated that the purity of CD44+CD24-△ow subset cells exceed 90%. Immunostaining analysis suggested that CD44+CD24-△ow subset cells expressed higher levels of transcription factors Oct-4 and SOX-2,lower levels of differentiated factors CK-18 and α-SMA than non-CD44+CD24-△ow subset cells. In vitro, CD44+ CD24-△ow subset cells were verified to possess the ability of forming tumor spheres and multipotency. Conclusion: CD44+CD24-△ow subset cells contained higher proportion of breast cancer stem cells and expressed higher levels of Oct-4 and SOX-2.%目的:通过表面标志分选法富集乳腺癌干细胞,并初步鉴定其肿瘤干细胞特性.方法:采用流式细胞分选术从人乳腺癌细胞系MCF-7中分选CD44+CD24-Λow乳腺癌干细胞,并进行干细胞比例分析;用免疫荧光法检测、比较分选获得的细胞和对照细胞的干性和分化标记物Oct-4、SOX-2、CK-18和α-SMA的表达状态.结果:分选获得的CD44+CD24-Λow乳腺癌干细胞阳性比例达90%以上;免疫荧光检测结果显示,CD44+CD24-Λow细胞亚群比non-CD44+CD24-Λow细胞亚群高表达干细胞转录因子Oct-4、SOX-2,低表达分化因子CK-18、α-SMA;体外实验表明,CD44+CD24-Λow细胞亚群具有更强的成球生长能力,并具有双向分化潜能.结论:CD44+CD24-Λow表面标记物分选的方法可以富集高纯度的乳腺癌干细胞,且呈现干性因子Oct-4和SOX-2高表达.

  20. Membrane-Associated RING-CH proteins associate with Bap31 and target CD81 and CD44 to lysosomes.

    Directory of Open Access Journals (Sweden)

    Eric Bartee

    Full Text Available Membrane-associated RING-CH (MARCH proteins represent a family of transmembrane ubiquitin ligases modulating intracellular trafficking and turnover of transmembrane protein targets. While homologous proteins encoded by gamma-2 herpesviruses and leporipoxviruses have been studied extensively, limited information is available regarding the physiological targets of cellular MARCH proteins. To identify host cell proteins targeted by the human MARCH-VIII ubiquitin ligase we used stable isotope labeling of amino-acids in cell culture (SILAC to monitor MARCH-dependent changes in the membrane proteomes of human fibroblasts. Unexpectedly, we observed that MARCH-VIII reduced the surface expression of Bap31, a chaperone that predominantly resides in the endoplasmic reticulum (ER. We demonstrate that Bap31 associates with the transmembrane domains of several MARCH proteins and controls intracellular transport of MARCH proteins. In addition, we observed that MARCH-VIII reduced the surface expression of the hyaluronic acid-receptor CD44 and both MARCH-VIII and MARCH-IV sequestered the tetraspanin CD81 in endo-lysosomal vesicles. Moreover, gene knockdown of MARCH-IV increased surface levels of endogenous CD81 suggesting a constitutive involvement of this family of ubiquitin ligases in the turnover of tetraspanins. Our data thus suggest a role of MARCH-VIII and MARCH-IV in the regulated turnover of CD81 and CD44, two ubiquitously expressed, multifunctional proteins.

  1. Membrane-Associated RING-CH proteins associate with Bap31 and target CD81 and CD44 to lysosomes.

    Science.gov (United States)

    Bartee, Eric; Eyster, Craig A; Viswanathan, Kasinath; Mansouri, Mandana; Donaldson, Julie G; Früh, Klaus

    2010-12-02

    Membrane-associated RING-CH (MARCH) proteins represent a family of transmembrane ubiquitin ligases modulating intracellular trafficking and turnover of transmembrane protein targets. While homologous proteins encoded by gamma-2 herpesviruses and leporipoxviruses have been studied extensively, limited information is available regarding the physiological targets of cellular MARCH proteins. To identify host cell proteins targeted by the human MARCH-VIII ubiquitin ligase we used stable isotope labeling of amino-acids in cell culture (SILAC) to monitor MARCH-dependent changes in the membrane proteomes of human fibroblasts. Unexpectedly, we observed that MARCH-VIII reduced the surface expression of Bap31, a chaperone that predominantly resides in the endoplasmic reticulum (ER). We demonstrate that Bap31 associates with the transmembrane domains of several MARCH proteins and controls intracellular transport of MARCH proteins. In addition, we observed that MARCH-VIII reduced the surface expression of the hyaluronic acid-receptor CD44 and both MARCH-VIII and MARCH-IV sequestered the tetraspanin CD81 in endo-lysosomal vesicles. Moreover, gene knockdown of MARCH-IV increased surface levels of endogenous CD81 suggesting a constitutive involvement of this family of ubiquitin ligases in the turnover of tetraspanins. Our data thus suggest a role of MARCH-VIII and MARCH-IV in the regulated turnover of CD81 and CD44, two ubiquitously expressed, multifunctional proteins.

  2. Evaluation of characteristics of CD44+CD117+ ovarian cancer stem cells in three dimensional basement membrane extract scaffold versus two dimensional monocultures

    Directory of Open Access Journals (Sweden)

    Chen Junsong

    2013-01-01

    Full Text Available Abstract Background Cancer stem cells (CSCs are thought to be capable of surviving conventional chemotherapeutic treatments because the cells have more resistant to anticancer drugs than common cancer cells. Most in vitro studies in experimental cancer cells have been done in a two-dimensional (2D monocultures, while accumulating evidence suggests that cancer cells behave differently when they are grown within a three-dimensional (3D culture system. Results The CD44+CD117+cells isolated from human epithelial ovarian cancer SKOV-3 cell line using magnetic-activated cell sorting were found to grow faster than the SKOV-3 cells in the 3D culture and in the nude mice. Anticancer drugs 5FU, docetaxel, cisplatin, and carboplatin were seen to inhibit growth of the CD44+CD117+ cells by 50% in the 2D culture with IC50 concentration, whereas, in the 3D culture, the four drugs inhibited the cell growth by only 34.4%, 40.8%, 34.8% and 21.9% at 3D one, respectively. Effect of paclitaxel on the CD44+CD117+cell viability indicated that fewer cells underwent apoptosis in 3D culture than that in 2D one. In addition, anticancer drugs markedly increased the expression of ABCG2 and ABCB1 of CD44+CD117+cells in 3D culture. Conclusion Our assay demonstrated that human epithelial ovarian cancer CD44+CD117+cells possessed the properties of CSCs that exhibited more chemoresistance in the 3D culture than that of in 2D one. The 3D culture provides a realistic model for study of the CSC response to anticancer drugs.

  3. CD44 family proteins in gastric cancer: a meta-analysis and narrative review.

    Science.gov (United States)

    Wu, Ying; Li, Zhi; Zhang, Chenlu; Yu, Kai; Teng, Zan; Zheng, Guoliang; Wang, Shuang; Liu, Yunpeng; Cui, Lei; Yu, Xiaosong

    2015-01-01

    With a meta-analysis and narrative review, we evaluated the clinical and prognostic role of all CD44 family proteins in gastric cancer (GC). Literatures published up to August 2014 were searched on PubMed. Among the 37 eligible studies (6606 patients), 34 were included in meta-analysis, and 10 were subjected to narrative review. With meta-analysis, standard CD44 (CD44s) was demonstrated to predict reduced overall survival (OS) (HR = 1.93, 95% CI: 1.58-2.34, PHR = 0.0222) and disease free survival (HR = 3.13, 95% CI: 1.02-9.68, PHR = 0.0469), advanced N-stage (RR = 1.12, 95% CI: 1.04-1.21, PRR = 0.0019), and distant metastasis (RR = 2.14, 95% CI: 1.46-3.14, PRR PRR = 0.0240), M-stage (RR = 2.54, 95% CI: 1.08-6.00, PRR = 0.0333), TNM-stage (RR = 1.72, 95% CI: 1.18-2.50, PRR = 0.0045), Lauren type (RR = 0.67, 95% CI: 0.50-0.91, PRR = 0.0106), lymphatic invasion (RR = 1.13, 95% CI: 1.04-1.23, PRR = 0.0057), and liver metastasis (RR = 3.20, 95% CI: 1.94-5.27, PRR < 0.0001) of the disease. Moreover, a narrative review was performed for CD44 isoforms, such as v3, v5, v7, v8-10, and v9, in GC. In conclusion, CD44s and CD44v6 as evaluated by immunohistochemistry, respectively, predicts the prognosis and disease severity of GC.

  4. Analisis de la energia de adhesion intercambiada en la union CD44-Hyaluronato.

    OpenAIRE

    D'Arrigo, Mabel

    2009-01-01

    Recibido: Feb.2008 | Aceptado: Abr.2009 Los glóbulos rojos pueden adherirse a una superficie sólida por medio de las moléculas de adhesión que pueden estar vinculados a los receptores de membrana de los eritrocitos, como es el caso de las moléculas de hialuronato , que se unen a los receptores CD44 en la membrana eritrocitaria. El objetivo de este trabajo fue medir la energía específica ( d), del eritrocito hialuronato receptor (CD44) y su ligando hialuronato, bajo condiciones dinámicas. C...

  5. PCBP-1 regulates alternative splicing of the CD44 gene and inhibits invasion in human hepatoma cell line HepG2 cells

    Directory of Open Access Journals (Sweden)

    Ge Changhui

    2010-04-01

    Full Text Available Abstract Background PCBP1 (or alpha CP1 or hnRNP E1, a member of the PCBP family, is widely expressed in many human tissues and involved in regulation of transcription, transportation process, and function of RNA molecules. However, the role of PCBP1 in CD44 variants splicing still remains elusive. Results We found that enforced PCBP1 expression inhibited CD44 variants expression including v3, v5, v6, v8, and v10 in HepG2 cells, and knockdown of endogenous PCBP1 induced these variants splicing. Invasion assay suggested that PCBP1 played a negative role in tumor invasion and re-expression of v6 partly reversed the inhibition effect by PCBP1. A correlation of PCBP1 down-regulation and v6 up-regulation was detected in primary HCC tissues. Conclusions We first characterized PCBP1 as a negative regulator of CD44 variants splicing in HepG2 cells, and loss of PCBP1 in human hepatic tumor contributes to the formation of a metastatic phenotype.

  6. Aggravation of Allergic Airway Inflammation by Cigarette Smoke in Mice Is CD44-Dependent.

    Directory of Open Access Journals (Sweden)

    Smitha Kumar

    Full Text Available Although epidemiological studies reveal that cigarette smoke (CS facilitates the development and exacerbation of allergic asthma, these studies offer limited information on the mechanisms involved. The transmembrane glycoprotein CD44 is involved in cell adhesion and acts as a receptor for hyaluronic acid and osteopontin. We aimed to investigate the role of CD44 in a murine model of CS-facilitated allergic airway inflammation.Wild type (WT and CD44 knock-out (KO mice were exposed simultaneously to house dust mite (HDM extract and CS. Inflammatory cells, hyaluronic acid (HA and osteopontin (OPN levels were measured in bronchoalveolar lavage fluid (BALF. Proinflammatory mediators, goblet cell metaplasia and peribronchial eosinophilia were assessed in lung tissue. T-helper (Th 1, Th2 and Th17 cytokine production was evaluated in mediastinal lymph node cultures.In WT mice, combined HDM/CS exposure increased the number of inflammatory cells and the levels of HA and OPN in BALF and Th2 cytokine production in mediastinal lymph nodes compared to control groups exposed to phosphate buffered saline (PBS/CS, HDM/Air or PBS/Air. Furthermore, HDM/CS exposure significantly increased goblet cell metaplasia, peribronchial eosinophilia and inflammatory mediators in the lung. CD44 KO mice exposed to HDM/CS had significantly fewer inflammatory cells in BALF, an attenuated Th2 cytokine production, as well as decreased goblet cells and peribronchial eosinophils compared to WT mice. In contrast, the levels of inflammatory mediators were similar or higher than in WT mice.We demonstrate for the first time that the aggravation of pulmonary inflammation upon combined exposure to allergen and an environmental pollutant is CD44-dependent. Data from this murine model of concomitant exposure to CS and HDM might be of importance for smoking allergic asthmatics.

  7. CD44 knock-down in bovine and human chondrocytes results in release of bound HYAL2

    Science.gov (United States)

    Hida, Daisuke; Danielson, Ben T.; Knudson, Cheryl B.; Knudson, Warren

    2015-01-01

    CD44 shedding occurs in osteoarthritic chondrocytes. Previous work of others has suggested that the hyaluronidase isoform HYAL2 has the capacity to bind to CD44, a binding that may itself induce CD44 cleavage. Experiments were developed to elucidate whether chondrocyte HYAL2: (1) was exposed on the extracellular plasma membrane of chondrocytes, (2) bound to CD44, (3) underwent shedding together with CD44 and lastly, (4) exhibited hyaluronidase activity within a near-neutral pH range. Enhancing CD44 shedding by IL-1β resulted in a proportional increase in HYAL2 released from human and bovine chondrocytes into the medium. CD44 knockdown by siRNA also resulted in increased accumulation of HYAL2 in the media of chondrocytes. By hyaluronan zymography only activity at pH 3.7 was observed and this activity was reduced by pre-treatment of chondrocytes with trypsin. CD44 and HYAL2 were found to co-immunoprecipitate, and to co-localize within intracellular vesicles and at the plasma membrane. Degradation of hyaluronan was visualized by agarose gel electrophoresis. With this approach, hyaluronidase activity could be observed at pH 4.8 under assay conditions in which CD44 and HYAL2 binding remained intact; additionally, weak hyaluronidase activity could be observed at pH 6.8 under these conditions. This study suggests that CD44 and HYAL2 are bound at the surface of chondrocytes. The release of HYAL2 when CD44 is shed could provide a mechanism for weak hyaluronidase activity to occur within the more distant extracellular matrix of cartilage. PMID:25864644

  8. Selective regain of egfr gene copies in CD44+/CD24-/low breast cancer cellular model MDA-MB-468

    Directory of Open Access Journals (Sweden)

    Andreas Antje

    2010-03-01

    Full Text Available Abstract Background Increased transcription of oncogenes like the epidermal growth factor receptor (EGFR is frequently caused by amplification of the whole gene or at least of regulatory sequences. Aim of this study was to pinpoint mechanistic parameters occurring during egfr copy number gains leading to a stable EGFR overexpression and high sensitivity to extracellular signalling. A deeper understanding of those marker events might improve early diagnosis of cancer in suspect lesions, early detection of cancer progression and the prediction of egfr targeted therapies. Methods The basal-like/stemness type breast cancer cell line subpopulation MDA-MB-468 CD44high/CD24-/low, carrying high egfr amplifications, was chosen as a model system in this study. Subclones of the heterogeneous cell line expressing low and high EGF receptor densities were isolated by cell sorting. Genomic profiling was carried out for these by means of SNP array profiling, qPCR and FISH. Cell cycle analysis was performed using the BrdU quenching technique. Results Low and high EGFR expressing MDA-MB-468 CD44+/CD24-/low subpopulations separated by cell sorting showed intermediate and high copy numbers of egfr, respectively. However, during cell culture an increase solely for egfr gene copy numbers in the intermediate subpopulation occurred. This shift was based on the formation of new cells which regained egfr gene copies. By two parametric cell cycle analysis clonal effects mediated through growth advantage of cells bearing higher egfr gene copy numbers could most likely be excluded for being the driving force. Subsequently, the detection of a fragile site distal to the egfr gene, sustaining uncapped telomere-less chromosomal ends, the ladder-like structure of the intrachromosomal egfr amplification and a broader range of egfr copy numbers support the assumption that dynamic chromosomal rearrangements, like breakage-fusion-bridge-cycles other than proliferation drive the gain

  9. Effect of CD44 gene polymorphisms on risk of transitional cell carcinoma of the urinary bladder in Taiwan.

    Science.gov (United States)

    Weng, Wei-Chun; Huang, Yu-Hui; Yang, Shun-Fa; Wang, Shian-Shiang; Kuo, Wu-Hsien; Hsueh, Chao-Wen; Huang, Ching-Hsuan; Chou, Ying-Erh

    2016-05-01

    The carcinogenesis of transitional cell carcinoma (TCC) of the urinary bladder involves etiological factors, such as ethnicity, the environment, genetics, and diet. Cluster of differentiation (CD44), a well-known tumor marker, plays a crucial role in regulating tumor cell differentiation and metastasis. This study investigated the effect of CD44 single nucleotide polymorphisms (SNPs) on TCC risk and clinicopathological characteristics. Five SNPs of CD44 were analyzed through real-time polymerase chain reaction in 275 patients with TCC and 275 participants without cancer. In this study, we observed that CD44 rs187115 polymorphism carriers with the genotype of at least one G were associated with TCC risk. Furthermore, TCC patients who carried at least one G allele at CD44 rs187115 had a higher stage risk than did patients carrying the wild-type allele (p TCC. In conclusion, our results suggest that CD44 SNPs influence the risk of TCC. Patients with CD44 rs187115 variant genotypes (AG + GG) exhibited a higher risk of TCC; these patients may possess chemoresistance to developing late-stage TCC compared with those with the wild-type genotype. The CD44 rs187115 SNP may predict poor prognosis in patients with TCC.

  10. Hyaluronic acid modified mesoporous carbon nanoparticles for targeted drug delivery to CD44-overexpressing cancer cells

    Science.gov (United States)

    Wan, Long; Jiao, Jian; Cui, Yu; Guo, Jingwen; Han, Ning; Di, Donghua; Chang, Di; Wang, Pu; Jiang, Tongying; Wang, Siling

    2016-04-01

    In this paper, hyaluronic acid (HA) functionalized uniform mesoporous carbon spheres (UMCS) were synthesized for targeted enzyme responsive drug delivery using a facile electrostatic attraction strategy. This HA modification ensured stable drug encapsulation in mesoporous carbon nanoparticles in an extracellular environment while increasing colloidal stability, biocompatibility, cell-targeting ability, and controlled cargo release. The cellular uptake experiments of fluorescently labeled mesoporous carbon nanoparticles, with or without HA functionalization, demonstrated that HA-UMCS are able to specifically target cancer cells overexpressing CD44 receptors. Moreover, the cargo loaded doxorubicin (DOX) and verapamil (VER) exhibited a dual pH and hyaluronidase-1 responsive release in the tumor microenvironment. In addition, VER/DOX/HA-UMCS exhibited a superior therapeutic effect on an in vivo HCT-116 tumor in BALB/c nude mice. In summary, it is expected that HA-UMCS will offer a new method for targeted co-delivery of drugs to tumors overexpressing CD44 receptors.

  11. Positively regulated bacterial expression systems.

    Science.gov (United States)

    Brautaset, Trygve; Lale, Rahmi; Valla, Svein

    2009-01-01

    Regulated promoters are useful tools for many aspects related to recombinant gene expression in bacteria, including for high-level expression of heterologous proteins and for expression at physiological levels in metabolic engineering applications. In general, it is common to express the genes of interest from an inducible promoter controlled either by a positive regulator or by a repressor protein. In this review, we discuss established and potentially useful positively regulated bacterial promoter systems, with a particular emphasis on those that are controlled by the AraC-XylS family of transcriptional activators. The systems function in a wide range of microorganisms, including enterobacteria, soil bacteria, lactic bacteria and streptomycetes. The available systems that have been applied to express heterologous genes are regulated either by sugars (L-arabinose, L-rhamnose, xylose and sucrose), substituted benzenes, cyclohexanone-related compounds, ε-caprolactam, propionate, thiostrepton, alkanes or peptides. It is of applied interest that some of the inducers require the presence of transport systems, some are more prone than others to become metabolized by the host and some have been applied mainly in one or a limited number of species. Based on bioinformatics analyses, the AraC-XylS family of regulators contains a large number of different members (currently over 300), but only a small fraction of these, the XylS/Pm, AraC/P(BAD), RhaR-RhaS/rhaBAD, NitR/PnitA and ChnR/Pb regulator/promoter systems, have so far been explored for biotechnological applications.

  12. Role of the Phosphorylation of mTOR in the Differentiation of AML Cells Triggered with CD44 Antigen

    KAUST Repository

    Darwish, Manar M

    2013-05-01

    Acute myeloid leukemia (AML) is a hematological disorder characterized by blockage of differentiation of myeloblasts. To date, the main therapy for AML is chemotherapy. Yet, studies are seeking a better treatment to enhance the survival rate of patients and minimize the relapsing of the disease. Since the major problem in these cells is that they are arrested in cellular differentiation, drugs that could induce their differentiation have proven to be efficient and of major interest for AML therapy. CD44 triggering appeared as a promising target for AML therapy as it has been shown that specific monoclonal antibodies, such as A3D8 and H90, reversed the blockage of differentiation, inhibited the proliferation of all AML subtypes, and in some cases, induced cell apoptosis. Studies conducted in our laboratory have added strength to these antibodies as potential treatment for AML. Indeed, our laboratory found that treating HL60 cells with A3D8 shows a decrease in the phosphorylation of the mammalian target of Rapamycin (mTOR) kinase correlated with the inhibition of proliferation/induction of differentiation of AML cells.The relationship between the induction of differentiation and the inhibition of proliferation and the decrease of mTOR phosphorylation remains to be clarified. To study the importance of the de-phosphorylation of mTOR and the observed effect of CD44 triggering on differentiation and/or proliferation, we sought to prepare phospho-mimic mutants of the mTOR kinase that will code for a constitutively phosphorylated form of mTOR and used two main methods to express this mutant in HL60 cells: lentiviral and simple transfection (cationic-liposomal transfection).

  13. Effect of Apigenin on Matrix Metalloproteinases and CD44v6 in Human Colon Cancer Cell SW480%芹菜素对结肠癌SW480细胞MMP及CD44v6作用的实验研究

    Institute of Scientific and Technical Information of China (English)

    孟勇; 李华; 马清涌; 林增海; 吴华涛

    2011-01-01

    目的 观测不同浓度芹菜素处理后基质金属蛋白酶-2及基质金属蛋白酶-9的分泌情况;检测CD44v6跨膜糖蛋白黏附分子的表达.方法 酶谱分析法和酶联免疫吸附法测定不同浓度芹菜素处理后基质金属蛋白酶-2及基质金属蛋白酶-9的分泌情况;免疫组织化学法检测不同浓度芹菜素处理后细胞CD44v6的表达.结果 酶谱分析法和酶联免疫吸附法测定均显示不同浓度芹菜素处理后基质金属蛋白酶-2及基质金属蛋白酶-9的分泌量随着药物浓度的升高而减少,呈时间和剂量.SW480细胞表达的CD44v6与芹菜素浓度呈负相关.结论 芹菜素抑制SW480细胞分泌基质金属蛋白酶基质金属蛋白酶-2和基质金属蛋白酶-9,芹菜素是一种良好的基质金属蛋白酶抑制剂.芹菜素抑制SW480细胞粘附分子CD44v6的表达,这可能是它抑制肿瘤侵袭和转移的机制之一.%Objective To investigate the secretion of MMP-2 and MMP-9 and the expression of CD44v6 in human SW480 cell after treated with apigenin. Methods Gelatin zymogram and enzyme-linked immunosorbent assay was used to analyze the effects of apigenin on production of matrix metalloproteinase-2 and 9. The protein expressions of CD44v6 in human SW480 cell after treated by apigenin were measured by immunohistochemistry. Results Gelatin zymogram and enzyme-linked immunosorbent assay showed that secretion of matrix metalloproteinase-2 and 9 decreased after treated with apigenin. There was an inverse correlation between the protein expression of CD44v6 in human SW480 cells and dose of apigenin. Conclusion Apigenin could inhibit the secretion of MMP-2 and MMP-9 in SW480 cells, apigenin was a good matrix metalloproteinase inhibitors. Apigenin could suppress the protein expressions of CD44v6 on SW480 cells, It may be one of the mechanisms that it inhibited tumor invasion and metastasis.

  14. Lipid-based nanosystems for CD44 targeting in cancer treatment: recent significant advances, ongoing challenges and unmet needs.

    Science.gov (United States)

    Nascimento, Thais Leite; Hillaireau, Hervé; Vergnaud, Juliette; Fattal, Elias

    2016-07-01

    Extensive experimental evidence demonstrates the important role of hyaluronic acid (HA)-CD44 interaction in cell proliferation and migration, inflammation and tumor growth. Taking advantage of this interaction, the design of HA-modified nanocarriers has been investigated for targeting CD44-overexpressing cells with the purpose of delivering drugs to cancer or inflammatory cells. The effect of such modification on targeting efficacy is influenced by several factors. In this review, we focus on the impact of HA-modification on the characteristics of lipid-based nanoparticles. We try to understand how these modifications influence particle physicochemical properties, interaction with CD44 receptors, intracellular trafficking pathways, toxicity, complement/macrophage activation and pharmacokinetics. Our aim is to provide insight in tailoring particle modification by HA in order to design more efficient CD44-targeting lipid nanocarriers.

  15. Lipid-Based Nanovectors for Targeting of CD44-Overexpressing Tumor Cells

    Directory of Open Access Journals (Sweden)

    Silvia Arpicco

    2013-01-01

    Full Text Available Hyaluronic acid (HA is a naturally occurring glycosaminoglycan that exists in living systems, and it is a major component of the extracellular matrix. The hyaluronic acid receptor CD44 is found at low levels on the surface of epithelial, haematopoietic, and neuronal cells and is overexpressed in many cancer cells particularly in tumour initiating cells. HA has been therefore used as ligand attached to HA-lipid-based nanovectors for the active targeting of small or large active molecules for the treatment of cancer. This paper describes the different approaches employed for the preparation, characterization, and evaluation of these potent delivery systems.

  16. Human Umbilical Cord Mesenchymal Stem Cells Promote Breast Cancer Metastasis by Interleukin-8- and Interleukin-6-Dependent Induction of CD44(+)/CD24(-) Cells.

    Science.gov (United States)

    Ma, Fengxia; Chen, Dandan; Chen, Fang; Chi, Ying; Han, Zhibo; Feng, Xiaoming; Li, Xue; Han, Zhongchao

    2015-01-01

    Although emerging evidence links mesenchymal stem cells (MSCs) with cancer metastasis, the underlying mechanisms are poorly understood. In the present study, we found that human umbilical cord-derived MSCs (UC-MSCs) promoted MCF-7 cell migration in vitro and metastasis in vivo. To explore the mechanisms, the characteristics of MCF-7 cells cocultured with UC-MSCs were assessed. The expression and secretion of interleukin-8 (IL-8) and IL-6 were induced in MCF-7 cells cocultured with UC-MSCs. However, neutralization of IL-8 or IL-6 secreted by UC-MSCs could attenuate the enhanced expression of IL-8 and IL-6 in MCF-7 cells cocultured with UC-MSCs, which subsequently alleviated the enhanced migration. Similar to UC-MSCs, exogenous human recombinant IL-8 or IL-6 also promoted IL-8 and IL-6 expression and MCF-7 cell migration. In addition to enhanced IL-8 and IL-6 expression, MCF-7 cells cocultured with UC-MSCs displayed enhanced mammosphere-forming ability and increased percentage of CD44(+)/CD24(-) cells. However, epithelial-to-mesenchymal transition (EMT) was not observed in MCF-7 cells cocultured with UC-MSCs. Taken together, these results suggested that IL-8 and IL-6 secreted by UC-MSCs activated the autocrine IL-8 and IL-6 signaling in MCF-7 cells and induced CD44(+)/CD24(-) cells, which subsequently promoted MCF-7 cell migration in vitro and metastasis in vivo.

  17. CD44+/CD24- breast cancer cells exhibit phenotypic reversion in three-dimensional self-assembling peptide RADA16 nanofiber scaffold

    Directory of Open Access Journals (Sweden)

    Mi K

    2015-04-01

    Full Text Available Kun Mi,1 Zhihua Xing2 1Department of Biochemistry and Molecular Biology, Sichuan Cancer Hospital and Institute, 2Laboratory of Ethnopharmacology, Institute for Nanobiomedical Technology and Membrane Biology, West China Hospital, Sichuan University, Chengdu, People’s Republic of China Background: Self-assembling peptide nanofiber scaffolds have been shown to be a ­permissive biological material for tissue repair, cell proliferation, differentiation, etc. Recently, a subpopulation (CD44+/CD24- of breast cancer cells has been reported to have stem/progenitor cell properties. The aim of this study was to investigate whether this subpopulation of cancer cells have different phenotypes in self-assembling COCH3-RADARADARADARADA-CONH2 (RADA16 peptide nanofiber scaffold compared with Matrigel® (BD Biosciences, Two Oak Park, Bedford, MA, USA and collagen I.Methods: CD44 and CD24 expression was determined by flow cytometry. Cell proliferation was measured by 5-bromo-2'-deoxyuridine assay and DNA content measurement. Immunostaining was used to indicate the morphologies of cells in three-dimensional (3D cultures of different scaffolds and the localization of β-catenin in the colonies. Western blot was used to determine the expression of signaling proteins. In vitro migration assay and inoculation into nude mice were used to evaluate invasion and tumorigenesis in vivo.Results: The breast cancer cell line MDA-MB-435S contained a high percentage (>99% of CD44+/CD24- cells, which exhibited phenotypic reversion in 3D RADA16 nanofiber scaffold compared with collagen I and Matrigel. The newly formed reverted acini-like colonies reassembled a basement membrane and reorganized their cytoskeletons. At the same time, cells cultured and embedded in RADA16 peptide scaffold exhibited growth arrest. Also, they exhibited different migration potential, which links their migration ability with their cellular morphology. Consistent with studies in vitro, the in vivo tumor

  18. 磁珠细胞分选CD133+/CD44+前列腺癌干细胞的初步鉴定%Initial identification of CD133+/CD44+ prostate cancer stem cell through magnetic bead cell sorting

    Institute of Scientific and Technical Information of China (English)

    盛夏; 王德林; 李文宾; 罗照

    2013-01-01

    目的:通过磁珠细胞分选(magnetic bead cell sorting,MACS)方法从人前列腺癌细胞系PC-3中分选CD133+/CD44+干细胞,为进一步功能性研究奠定基础.方法:运用流式细胞仪(flow cytometry,FCM)检测MACS分选前后PC-3细胞膜上CD133和CD44表达情况;观察无血清培养成球情况,免疫荧光(immunofluorescenee,IF)表达情况;比较细胞在分选前后的形态学、增殖能力方面的差异;免疫组化(immunohistochemistry,IHC)和Western blot检测诱导分化前后前列腺酸性磷酸酶(prostatic acid phosphatase,PAP)蛋白情况.结果:FCM检测PC-3细胞CD133和CD44的阳性表达分别是(1.33±0.05)%和(0.87±0.06)%,而MACS分选后PAP分别为(84.82±0.07)%和(99.91±0.03)%;IF检测CD133+/CD44+细胞培养后继续呈阳性表达;CD133+/CD44+细胞增殖能力高于PC-3细胞(t=11.0,P=0.008)以及高于诱导后的CD133+/CD44+细胞(t=40.1,P=0.001);CD133+/CD44+细胞经过转化生长因子-β诱导后IHC和Western blot检测PAP表达呈阳性,而未诱导的CD133+/CD44+细胞表达呈阴性.结论:MACS从PC-3细胞株中分选的CD 133+/CD44+细胞经过初步功能性鉴定具有干细胞的某些特性,可为前列腺癌干细胞的进一步探索充当铺垫.

  19. Crystallographic characterization of the radixin FERM domain bound to the cytoplasmic tail of adhesion molecule CD44

    Energy Technology Data Exchange (ETDEWEB)

    Mori, Tomoyuki; Kitano, Ken; Terawaki, Shin-ichi; Maesaki, Ryoko; Hakoshima, Toshio, E-mail: hakosima@bs.naist.jp [Structural Biology Laboratory, Nara Institute of Science and Technology, Keihanna Science City, Nara 630-0192 (Japan)

    2007-10-01

    The radixin FERM domain complexed with the CD44 cytoplasmic tail peptide has been crystallized. A diffraction data set from the complex was collected to 2.1 Å. CD44 is an important adhesion molecule that specifically binds hyaluronic acid and regulates cell–cell and cell–matrix interactions. Increasing evidence has indicated that CD44 is assembled in a regulated manner into the membrane–cytoskeletal junction, a process that is mediated by ERM (ezrin/radixin/moesin) proteins. Crystals of a complex between the radixin FERM domain and the C-terminal cytoplasmic region of CD44 have been obtained. The crystal of the radixin FERM domain bound to the CD44 cytoplasmic tail peptide belongs to space group P2{sub 1}2{sub 1}2{sub 1}, with unit-cell parameters a = 62.70, b = 66.18, c = 86.22 Å, and contain one complex in the crystallographic asymmetric unit. An intensity data set was collected to a resolution of 2.1 Å.

  20. MDR1 siRNA loaded hyaluronic acid-based CD44 targeted nanoparticle systems circumvent paclitaxel resistance in ovarian cancer

    Science.gov (United States)

    Yang, Xiaoqian; Lyer, Arun K.; Singh, Amit; Choy, Edwin; Hornicek, Francis J.; Amiji, Mansoor M.; Duan, Zhenfeng

    2015-02-01

    Development of multidrug resistance (MDR) is an almost universal phenomenon in patients with ovarian cancer, and this severely limits the ultimate success of chemotherapy in the clinic. Overexpression of the MDR1 gene and corresponding P-glycoprotein (Pgp) is one of the best known MDR mechanisms. MDR1 siRNA based strategies were proposed to circumvent MDR, however, systemic, safe, and effective targeted delivery is still a major challenge. Cluster of differentiation 44 (CD44) targeted hyaluronic acid (HA) based nanoparticle has been shown to successfully deliver chemotherapy agents or siRNAs into tumor cells. The goal of this study is to evaluate the ability of HA-PEI/HA-PEG to deliver MDR1 siRNA and the efficacy of the combination of HA-PEI/HA-PEG/MDR1 siRNA with paclitaxel to suppress growth of ovarian cancer. We observed that HA-PEI/HA-PEG nanoparticles can efficiently deliver MDR1 siRNA into MDR ovarian cancer cells, resulting in down-regulation of MDR1 and Pgp expression. Administration of HA-PEI/HA-PEG/MDR1 siRNA nanoparticles followed by paclitaxel treatment induced a significant inhibitory effect on the tumor growth, decreased Pgp expression and increased apoptosis in MDR ovarian cancer mice model. Our findings suggest that CD44 targeted HA-PEI/HA-PEG/MDR1 siRNA nanoparticles can serve as a therapeutic tool with great potentials to circumvent MDR in ovarian cancer.

  1. Synovial fluid pretreatment with hyaluronidase facilitates isolation of CD44+ extracellular vesicles

    Science.gov (United States)

    Boere, Janneke; van de Lest, Chris H. A.; Libregts, Sten F. W. M.; Arkesteijn, Ger J. A.; Geerts, Willie J. C.; Nolte-'t Hoen, Esther N. M.; Malda, Jos; van Weeren, P. René; Wauben, Marca H. M.

    2016-01-01

    Extracellular vesicles (EVs) in synovial fluid (SF) are gaining increased recognition as important factors in joint homeostasis, joint regeneration, and as biomarkers of joint disease. A limited number of studies have investigated EVs in SF samples of patients with joint disease, but knowledge on the role of EVs in healthy joints is lacking. In addition, no standardized protocol is available for isolation of EVs from SF. Based on the high viscosity of SF caused by high concentrations of hyaluronic acid (HA) – a prominent extracellular matrix component – it was hypothesized that EV recovery could be optimized by pretreatment with hyaluronidase (HYase). Therefore, the efficiency of EV isolation from healthy equine SF samples was tested by performing sequential ultracentrifugation steps (10,000g, 100,000g and 200,000g) in the presence or absence of HYase. Quantitative EV analysis using high-resolution flow cytometry showed an efficient recovery of EVs after 100,000g ultracentrifugation, with an increased yield of CD44+ EVs when SF samples were pretreated with HYase. Morphological analysis of SF-derived EVs with cryo-transmission-electron microscopy did not indicate damage by high-speed ultracentrifugation and revealed that most EVs are spherical with a diameter of 20–200 nm. Further protein characterization by Western blotting revealed that healthy SF-derived EVs contain CD9, Annexin-1, and CD90/Thy1.1. Taken together, these data suggest that EV isolation protocols for body fluids that contain relatively high amounts of HA, such as SF, could benefit from treatment of the fluid with HYase prior to ultracentrifugation. This method facilitates recovery and detection of CD44+ EVs within the HA-rich extracellular matrix. Furthermore, based on the findings presented here, it is recommended to sediment SF-derived EVs with at least 100,000g for optimal EV recovery. PMID:27511891

  2. High expression of hTERT and stemness genes in BORIS/CTCFL positive cells isolated from embryonic cancer cells.

    Directory of Open Access Journals (Sweden)

    Loredana Alberti

    Full Text Available BORIS/CTCFL is a member of cancer testis antigen family normally expressed in germ cells. In tumors, it is aberrantly expressed although its functions are not completely well-defined. To better understand the functions of BORIS in cancer, we selected the embryonic cancer cells as a model. Using a molecular beacon, which specifically targets BORIS mRNA, we demonstrated that BORIS positive cells are a small subpopulation of tumor cells (3-5% of total. The BORIS-positive cells isolated using BORIS-molecular beacon, expressed higher telomerase hTERT, stem cell (NANOG, OCT4, SOX2 and cancer stem cell marker genes (CD44 and ALDH1 compared to the BORIS-negative tumor cells. In order to define the functional role of BORIS, stable BORIS-depleted embryonic cancer cells were generated. BORIS silencing strongly down-regulated the expression of hTERT, stem cell and cancer stem cell marker genes. Moreover, the BORIS knockdown increased cellular senescence in embryonic cancer cells, revealing a putative role of BORIS in the senescence biological program. Our data indicate an association of BORIS expressing cells subpopulation with the expression of stemness genes, highlighting the critical role played by BORIS in embryonic neoplastic disease.

  3. Stem cell CD44v isoforms promote intestinal cancer formation in Apc(min) mice downstream of Wnt signaling

    NARCIS (Netherlands)

    Zeilstra, J; Joosten, S P J; van Andel, H; Tolg, C; Berns, A; Snoek, M; van de Wetering, M; Spaargaren, M; Clevers, H; Pals, S T

    2014-01-01

    A gene signature specific for intestinal stem cells (ISCs) has recently been shown to predict relapse in colorectal cancer (CRC) but the tumorigenic role of individual signature genes remains poorly defined. A prominent ISC-signature gene is the cancer stem cell marker CD44, which encodes various sp

  4. CD44, SHH and SOX2 as novel biomarkers in esophageal cancer patients treated with neoadjuvant chemoradiotherapy

    NARCIS (Netherlands)

    Honing, Judith; Pavlov, Kirill V.; Mul, Veronique E. M.; Karrenbeld, Arend; Meijer, Coby; Faiz, Zohra; Smit, Justin K.; Hospers, Geke A. P.; Burgerhof, Johannes G. M.; Kruyt, Frank A. E.; Kleibeuker, Jan H.; Plukker, John T. M.

    2015-01-01

    Background and purpose: Neoadjuvant chemoradiotherapy (nCRT) improves survival in esophageal cancer (EC) patients, but the response to treatment is heterogeneous and little is known regarding prognostic and predictive markers in these patients. CD44, SOX2 and SHH have been implicated in resistance t

  5. Biocompatible hyaluronic acid polymer-coated quantum dots for CD44+ cancer cell-targeted imaging

    Science.gov (United States)

    Wang, Hening; Sun, Hongfang; Wei, Hui; Xi, Peng; Nie, Shuming; Ren, Qiushi

    2014-10-01

    The cysteamine-modified hyaluronic acid (HA) polymer was employed to coat quantum dots (QDs) through a convenient one-step reverse micelle method, with the final QDs hydrodynamic size of around 22.6 nm. The HA coating renders the QDs with very good stability in PBS for more than 140 days and resistant to large pH range of 2-12. Besides, the HA-coated QDs also show excellent fluorescence stability in BSA-containing cell culture medium. In addition, the cell culture assay indicates no significant cytotoxicity for MD-MB-231 breast cancer cells, and its targeting ability to cancer receptor CD44 has been demonstrated on two breast cancer cell lines. The targeting mechanism was further proved by the HA competition experiment. This work has established a new approach to help solve the stability and toxicity problems of QDs, and moreover render the QDs cancer targeting property. The current results indicate that the HA polymer-coated QDs hold the potential application for both in vitro and in vivo cancer imaging researches.

  6. Molecular imaging of EGFR and CD44v6 for prediction and response monitoring of HSP90 inhibition in an in vivo squamous cell carcinoma model

    Energy Technology Data Exchange (ETDEWEB)

    Spiegelberg, Diana; Mortensen, Anja C.; Stenerloew, Bo [Uppsala University, Department of Immunology, Genetics and Pathology, Uppsala (Sweden); Selvaraju, Ram K.; Eriksson, Olof [Uppsala University, Preclinical PET Platform, Uppsala (Sweden); Nestor, Marika [Uppsala University, Department of Immunology, Genetics and Pathology, Uppsala (Sweden); Uppsala University, Unit of Otolaryngology and Head and Neck Surgery, Department of Surgical Sciences, Uppsala (Sweden)

    2016-05-15

    Heat shock protein 90 (HSP90) is essential for the activation and stabilization of numerous oncogenic client proteins. AT13387 is a novel HSP90 inhibitor promoting degradation of oncogenic proteins upon binding, and may also act as a radiosensitizer. For optimal treatment there is, however, the need for identification of biomarkers for patient stratification and therapeutic response monitoring, and to find suitable targets for combination treatments. The aim of this study was to assess the response of surface antigens commonly expressed in squamous cell carcinoma to AT13387 treatment, and to find suitable biomarkers for molecular imaging and radioimmunotherapy in combination with HSP90 inhibition. Cancer cell proliferation and radioimmunoassays were used to evaluate the effect of AT13387 on target antigen expression in vitro. Inhibitor effects were then assessed in vivo in mice-xenografts. Animals were treated with AT13387 (5 x 50 mg/kg), and were imaged with PET using either {sup 18}F-FDG or {sup 124}I-labelled tracers for EGFR and CD44v6, and this was followed by ex-vivo biodistribution analysis and immunohistochemical staining. AT13387 exposure resulted in high cytotoxicity and possible radiosensitization with IC{sub 50} values below 4 nM. Both in vitro and in vivo AT13387 effectively downregulated HSP90 client proteins. PET imaging with {sup 124}I-cetuximab showed a significant decrease of EGFR in AT13387-treated animals compared with untreated animals. In contrast, the squamous cell carcinoma-associated biomarker CD44v6, visualized with {sup 124}I-AbD19384 as well as {sup 18}F-FDG uptake, were not significantly altered by AT13387 treatment. We conclude that AT13387 downregulates HSP90 client proteins, and that molecular imaging of these proteins may be a suitable approach for assessing treatment response. Furthermore, radioimmunotherapy targeting CD44v6 in combination with AT13387 may potentiate the radioimmunotherapy outcome due to radiosensitizing effects of

  7. Inhibition of Sonic Hedgehog Signaling Pathway by Thiazole Antibiotic Thiostrepton Attenuates the CD44+/CD24-Stem-Like Population and Sphere-Forming Capacity in Triple-Negative Breast Cancer

    Directory of Open Access Journals (Sweden)

    Na Yang

    2016-03-01

    Full Text Available Background/Aim: Triple-negative breast cancer (TNBC represents a particular clinical challenge because these cancers do not respond to endocrine therapy or other available targeted agents. The lack of effective agents and obvious targets are major challenges in treating TNBC. In this study we explored the cytostatic effect of thiazole ring containing antibiotic drug thiostrepton on TNBC cell lines and investigated the molecular mechanism. Methods: Cell viability was measured by MTT assay. Cell surface marker was monitored by FCM. Western blot was applied to assess the protein expression levels of target genes. Results: We found that thiostrepton remarkably suppressed the CD44+/CD24- stem-like population and sphere forming capacity of TNBC cell lines. Notably, we showed for the first time that thiostrepton exerted its pharmacological action by targeting sonic hedgehog (SHH signaling pathway. Thiostrepton repressed SHH ligand expression and reduced Gli-1 nuclear localization in TNBC cell line. Furthermore, the downstream target of SHH signaling undergone dose-dependent, rapid, and sustained loss of mRNA transcript level after thiostrepton treatment. Finally, we showed that SHH ligand was essential for maintaining CD44+/CD24- stem-like population in TNBC cell line. Conclusion: We conclude that thiostrepton suppresses the CD44+/CD24- stem-like population through inhibition of SHH signaling pathway. Our results give a new insight into the mechanism of thiostrepton anti-tumor activity and suggest thiostrepton as a promising agent that targets hedgehog signaling pathway in TNBC.

  8. 大肠腺瘤及癌组织中β-catenin、APC及CD44V6异常改变的意义%β-catenin, APC and CD44v6 genes in the colorectal adenoma and adenocarcinoma

    Institute of Scientific and Technical Information of China (English)

    王东旭; 苏铃; 房殿春; 李伟; 王建文; 闫晓初

    2003-01-01

    目的探讨β-catenin、APC基因及黏附分子CD44V6在大肠癌发生发展的作用.方法运用PCR-SSCP及免疫组化方法检测大肠腺瘤25例,大肠癌90例及癌旁正常粘膜45例中APC、β-catenin基因突变、蛋白表达及粘附分子CD44V6的表达.结果大肠粘膜中未见β-catenin、APC基因突变及CD44V6阳性表达(0%,0%,0%),而APC蛋白表达阳性率为100%(45/45).大肠腺瘤β-catenin突变率及蛋白异常表达率分别为24%(6/25),32%(8/25).APC突变率及蛋白表达率分别为12%(3/25)、80%(20/25).CD44V6异常表达率为4%(1/25).大肠癌中β-catenin突变率、蛋白表达率分别为27.8%(25/90)及32.2%(29/90),APC突变率、蛋白表达率分别为22.2%(20/90)及44.4%(40/90).CD44V6表达率72.2%(65/90).大肠癌及腺瘤中β-catenin突变率及蛋白异常表达率显著高于正常大肠黏膜(P<0.05,P<0.01),而大肠癌与腺瘤组织间无显著差别(P>0.05).大肠癌中APC突变率及蛋白表达缺失率、CD44V6异常表达率显著高于腺瘤及正常大肠黏膜(P<0.05,P<0.01),而大肠腺瘤与正常组织间无显著差别(P>0.05).CD44V6表达异常与大肠癌的淋巴结转移、临床分期密切相关(P<0.05).三种基因改变之间无显著相关性.结论β-catenin、APC基因改变在大肠腺瘤向癌的转化中起一定作用.黏附分子CD44V6表达异常与大肠癌的预后有关,可作为判断预后的指标.

  9. Promoter- and cell-specific epigenetic regulation of CD44, Cyclin D2, GLIPR1 and PTEN by Methyl-CpG binding proteins and histone modifications

    Directory of Open Access Journals (Sweden)

    Schwarzenbach Heidi

    2010-06-01

    Full Text Available Abstract Background The aim of the current study was to analyze the involvement of methyl-CpG binding proteins (MBDs and histone modifications on the regulation of CD44, Cyclin D2, GLIPR1 and PTEN in different cellular contexts such as the prostate cancer cells DU145 and LNCaP, and the breast cancer cells MCF-7. Since global chromatin changes have been shown to occur in tumours and regions of tumour-associated genes are affected by epigenetic modifications, these may constitute important regulatory mechanisms for the pathogenesis of malignant transformation. Methods In DU145, LNCaP and MCF-7 cells mRNA expression levels of CD44, Cyclin D2, GLIPR1 and PTEN were determined by quantitative RT-PCR at the basal status as well as after treatment with demethylating agent 5-aza-2'-deoxycytidine and/or histone deacetylase inhibitor Trichostatin A. Furthermore, genomic DNA was bisulfite-converted and sequenced. Chromatin immunoprecipitation was performed with the stimulated and unstimulated cells using antibodies for MBD1, MBD2 and MeCP2 as well as 17 different histone antibodies. Results Comparison of the different promoters showed that MeCP2 and MBD2a repressed promoter-specifically Cyclin D2 in all cell lines, whereas in MCF-7 cells MeCP2 repressed cell-specifically all methylated promoters. Chromatin immunoprecipitation showed that all methylated promoters associated with at least one MBD. Treatment of the cells by the demethylating agent 5-aza-2'-deoxycytidine (5-aza-CdR caused dissociation of the MBDs from the promoters. Only MBD1v1 bound and repressed methylation-independently all promoters. Real-time amplification of DNA immunoprecipitated by 17 different antibodies showed a preferential enrichment for methylated lysine of histone H3 (H3K4me1, H3K4me2 and H3K4me3 at the particular promoters. Notably, the silent promoters were associated with unmodified histones which were acetylated following treatment by 5-aza-CdR. Conclusions This study is one

  10. Proteoglycan from salmon nasal cartridge promotes in vitro wound healing of fibroblast monolayers via the CD44 receptor

    Energy Technology Data Exchange (ETDEWEB)

    Ito, Gen; Kobayashi, Takeshi; Takeda, Yoshie [Department of Physiology, Nagoya University Graduate School of Medicine, Nagoya, Aichi 466-8550 (Japan); Sokabe, Masahiro, E-mail: msokabe@med.nagoya-u.ac.jp [Department of Physiology, Nagoya University Graduate School of Medicine, Nagoya, Aichi 466-8550 (Japan); Mechanobiology Laboratory, Nagoya University Graduate School of Medicine, Nagoya, Aichi 466-8550 (Japan); Mechanobiology Institute Singapore, National University of Singapore, Singapore 117411 (Singapore)

    2015-01-16

    Highlights: • Proteoglycan from salmon nasal cartridge (SNC-PG) promoted wound healing in fibroblast monolayers. • SNC-PG stimulated both cell proliferation and cell migration. • Interaction between chondroitin sulfate-units and CD44 is responsible for the effect. - Abstract: Proteoglycans (PGs) are involved in various cellular functions including cell growth, adhesion, and differentiation; however, their physiological roles are not fully understood. In this study, we examined the effect of PG purified from salmon nasal cartilage (SNC-PG) on wound closure using tissue-cultured cell monolayers, an in vitro wound-healing assay. The results indicated that SNC-PG significantly promoted wound closure in NIH/3T3 cell monolayers by stimulating both cell proliferation and cell migration. SNC-PG was effective in concentrations from 0.1 to 10 μg/ml, but showed much less effect at higher concentrations (100–1000 μg/ml). The effect of SNC-PG was abolished by chondroitinase ABC, indicating that chondroitin sulfates (CSs), a major component of glycosaminoglycans (GAGs) in SNC-PG, are crucial for the SNC-PG effect. Furthermore, chondroitin 6-sulfate (C-6-S), a major CS of SNC-PG GAGs, could partially reproduce the SNC-PG effect and partially inhibit the binding of SNC-PG to cells, suggesting that SNC-PG exerts its effect through an interaction between the GAGs in SNC-PG and the cell surface. Neutralization by anti-CD44 antibodies or CD44 knockdown abolished SNC-PG binding to the cells and the SNC-PG effect on wound closure. These results suggest that interactions between CS-rich GAG-chains of SNC-PG and CD44 on the cell surface are responsible for the SNC-PG effect on wound closure.

  11. On Expressing Value Externalities in Position Auctions

    OpenAIRE

    Constantin, Florin; Rao, Malvika; Huang, Chien-Chung; Parkes, David C.

    2011-01-01

    We introduce a bidding language for expressing negative value externalities in position auctions for online advertising. The unit-bidder constraints (UBC) language allows a bidder to condition a bid on its allocated slot and on the slots allocated to other bidders. We introduce a natural extension of the Generalized Second Price (GSP) auction, the expressive GSP (eGSP) auction, that induces truthful revelation of constraints for a rich subclass of unit-bidder types,namely downward-monotonic U...

  12. Terminal sialic acids on CD44 N-glycans can block hyaluronan binding by forming competing intramolecular contacts with arginine sidechains

    Science.gov (United States)

    Faller, Christina E.; Guvench, Olgun

    2014-01-01

    Specific sugar residues and their linkages form the basis of molecular recognition for interactions of glycoproteins with other biomolecules. Seemingly small changes, like the addition of a single monosaccharide in the covalently attached glycan component of glycoproteins, can greatly affect these interactions. For instance, the sialic acid capping of glycans affects protein-ligand binding involved in cell-cell and cell-matrix interactions. CD44 is a single-pass transmembrane glycoprotein whose binding with its carbohydrate ligand hyaluronan (HA), an extracellular matrix component, mediates processes such as leukocyte homing, cell adhesion, and tumor metastasis. This binding is highly regulated by glycosylation of the N-terminal extracellular hyaluronan-binding domain (HABD); specifically, sialic acid capped N-glycans of HABD inhibit ligand binding. However, the molecular mechanism behind this sialic acid mediated regulation has remained unknown. Two of the five N-glycosyation sites of HABD have been previously identified as having the greatest inhibitory effect on HA binding, but only if the glycans contain terminal sialic acid residues. These two sites, Asn25 and Asn120, were chosen for in silico glycosylation in this study. Here, from extensive standard molecular dynamics simulations and biased simulations, we propose a molecular mechanism for this behavior based on spontaneously-formed charge-paired hydrogen bonding interactions between the negatively-charged sialic acid residues and positively-charged Arg sidechains known to be critically important for binding to HA, which itself is negatively charged. Such intramolecular hydrogen bonds would preclude associations critical to hyaluronan binding. This observation suggests how CD44 and related glycoprotein binding is regulated by sialylation as cellular environments fluctuate. PMID:25116630

  13. Biological Characteristics of CD133+CD44+ Cancer Stem Cells Sorting from Laryngeal Carcinoma Cell Line TU177%喉癌TU177细胞系中CD133+CD44+肿瘤干细胞分选及特性分析

    Institute of Scientific and Technical Information of China (English)

    杨俊岭; 高伟; 王珏; 付荣; 陈波; 李伟艳; 温树信; 王斌全

    2016-01-01

    Objective :Magnetic activated cell sorting was used to separate CD133+CD44+ cancer cells from laryngeal car-cinoma TU177 cell line. Analysis the biological characteristics of these subpopulations .Methods :TU177 cells were subjected to magnetic activated cell sorting to obtain CD133+CD44+、CD133+CD44-、CD133-CD44+、CD133-CD44-cells. Evaluate the efficiency of magnetic separation by flow cytometry . Test cell proliferation,migration,invasion,adhesion,colony forming ability of the cells.Results: CD133+CD44+ cells show higher proliferation,migration,invasion,adhesion,clone ability than other group(P<0.0001).Conclusions:TU177 cells can be serparated by Magnetic activated cell sorting effectively. CD133 is more powerful than CD44.Our study may provide evidence for target treatment of laryngeal cancer.%目的:免疫磁珠分选喉癌TU177细胞系中的CD133+CD44+细胞,探讨CD133+CD44+细胞作为肿瘤干细胞的生物学特性。方法:培养喉癌TU177细胞,采用免疫磁珠分选技术分选CD133+CD44+、CD133+CD44-、CD133-CD44+、CD133-CD44-细胞,流式检测分选效率,检测各组细胞的增殖、侵袭、迁移、粘附、克隆形成能力。结果:CD133+CD44+细胞的增殖、迁移、侵袭、粘附、克隆能力均明显高于其他组,差异有统计学意义(P<0.0001)。结论:免疫磁珠技术能有效进行TU177细胞系的分选,CD133+CD44+细胞亚群具有强增殖、侵袭、迁移、粘附、克隆形成能力,具有肿瘤干细胞特征,CD133作为干细胞标志物,其干细胞特性强于CD44,可为喉癌的进一步靶向治疗提供依据。

  14. A cancer/testis antigen, NY-SAR-35, induces EpCAM, CD44, and CD133, and activates ERK in HEK293 cells.

    Science.gov (United States)

    Song, Myung-Ha; Kim, Ye-Rin; Bae, Jae-Ho; Shin, Dong-Hoon; Lee, Sang-Yull

    2017-03-04

    The cancer/testis (CT) antigen NY-SAR-35 gene is located on the X chromosome and is aberrantly expressed in various cancers but not in normal tissues, other than testes. Previously, we reported the expression of NY-SAR-35 enhanced cell growth, proliferation, and invasion in HEK293 and cancer cells. To extend understanding of the NY-SAR-35 gene, we used a next generation sequencing (NGS) approach. NY-SAR-35 expression induced growth, proliferation, metastasis, and stemness genes, as indicated by the up-regulations of CXCR4, EpCAM, CD133, and CD44, at the mRNA and protein levels. The expression of NY-SAR-35 in HEK293 cells significantly increased ERK phosphorylation, but not the phosphorylation of AKT. In HEK293/NY-SAR-35 cells, the expressions of pro-apoptotic proteins, including p53, Bax, and p21, were reduced and that of cyclin E was increased. Also, NY-SAR-35 increased the expressions of pluripotency genes (Nanog, Oct-4, and Sox2) and the ability of HEK293 cells to form colonies. Taken together, the present study indicates NY-SAR-35 functions as a CT antigen that triggers oncogenesis and self-renewal.

  15. Lubricin/Proteoglycan 4 Binding to CD44 Receptor: A Mechanism of Lubricin’s suppression of Pro-inflammatory Cytokine Induced Synoviocyte Proliferation

    Science.gov (United States)

    Al-Sharif, Afnan; Jamal, Maha; Zhang, Ling; Larson, Katherine; Schmidt, Tannin; Jay, Gregory; Elsaid, Khaled

    2015-01-01

    Objective To evaluate recombinant human proteoglycan 4 (rhPRG4) binding to CD44 receptor and its consequence on cytokine induced synoviocyte proliferation. Methods rhPRG4 binding to CD44 and competition with high molecular weight hyaluronic acid (HMW HA) was evaluated using a direct enzyme linked immunosorbent assay (ELISA) and surface plasmon resonance. Sialidase-A and O-glycosidase digestion of rhPRG4 was performed and CD44 binding was evaluated using ELISA. Rheumatoid arthritis fibroblast-like synoviocytes (RA-FLS) were stimulated with interleukin-1 beta (IL-1β) or tumor necrosis factor alpha (TNF-α) for 48 hours in the presence or absence of rhPRG4 or HMW HA at 20, 40 and 80μg/ml and cell proliferation was measured. CD44 contribution was assessed by co-incubation with a CD44 antibody (IM7). The anti-proliferative effect of rhPRG4 was investigated following treatment of Prg4−/− synoviocytes with IL-1β or TNF-α in the presence or absence of IM7. Results rhPRG4 binds CD44 and interferes with HMW HA CD44 binding. Removal of sialic acid and O-glycosylations significantly increased CD44 binding by rhPRG4 (p<0.001). rhPRG4 and HMW HA at 40 and 80μg/ml significantly suppressed IL-1β induced RA-FLS proliferation (p<0.05). rhPRG4 at 20, 40 and 80μg/ml significantly suppressed TNF-α induced RA-FLS proliferation (p<0.05). CD44 neutralization reversed the effect of rhPRG4 on IL-1β and TNF-α stimulated RA-FLS and the effect of HMW HA on IL-1β stimulated RA-FLS. rhPRG4 inhibited cytokine-induced proliferation of Prg4−/− synoviocytes which could be prevented by blocking CD44. Conclusion Lubricin is a novel putative ligand for CD44 and may control synoviocyte overgrowth in inflammatory arthropathies via a CD44-mediated mechanism. PMID:25708025

  16. The coordinate alteration of actin cytoskeleton, CD44 and matrix metalloproteinase-2 in the metastasis of breast cancer cells%转移相关分子链Actin-CD44-MMP-2在乳腺癌转移实验中的改变

    Institute of Scientific and Technical Information of China (English)

    赵威; 韩海勃; 林仲翔; 张志谦

    2011-01-01

    Objective To study the roles of actin and associated molecules in the control of human breast cancer cell malignant behaviors in vitro and in vivo.Methods A highly metastatic human breast cancer cell line BICR-H1 was compared with another breast cancer cell line MCF-7, which was well differentiated and non-metastatic.Western blot, immunofluorescence, gelatin zymography analysis and a chick embryonic chorioallantoic membrane (CAM) assay were used in this research.5~30 μg cisplatin or MMP-2 C terminal PEX domain were injected i.v.in CAM.Results BICR - H 1 expressed high level of CD44, which was closely associated with actin aggregates at the bottom side of attached cells.It was also shown with MMP-2 activity.On the contrary, MCF-7 cells showed weak disruption of actin cytoskeleton structures and a few actin aggregates.It expressed low or minimal level of CD44 and MMP-2.The expression of CD44 was down-regulated in cisplatin-treated BICR-H1 cells, and the activity of MMP-2 was also decreased upon PEX treatment.Both cell lines could form tumors in CAM, but only BICR-H1 cells could metastasize to distant tissues.Cisplatin inhibited the growth of BICR-H1 and MCF-7 cells in a time and dose dependent manner in CAM.The lung metastatic foci of BICR-H1 cells treated with 30 μg cisplatin were reduced from 30 ± 15/embryo (PBS group) to 8 ± 6/embryo, and the same dose of PEX could completely inhibit BICR-H1 metastasis.Conclusion It is concluded that actin cytoskeleton, CD44 and MMP-2 (ACM) molecular linkage is associated with breast cancer metastatic phenotypes, and both cisplatin and PEX can interfere with the ACM molecular linkage, resulting in the suppression of both tumor growth and metastasis.%目的 研究乳腺癌转移相关的分子机制及抑制体内外转移的作用和机制.方法 选择高、低转移性乳腺癌细胞系BICR-H1和MCF-7,用明胶底物非变性电泳分析法、Western blot和免疫荧光染色等方法,观察肌动蛋白、CD44

  17. Functional heterogeneity within the CD44 high human breast cancer stem cell-like compartment reveals a gene signature predictive of distant metastasis

    DEFF Research Database (Denmark)

    Leth-Larsen, Rikke; Terp, Mikkel Green; Christensen, Anne G

    2012-01-01

    The CD44(hi) compartment in human breast cancer is enriched in tumor-initiating cells; however the functional heterogeneity within this subpopulation remains poorly defined. We used a triple-negative breast cancer cell line with a known bi-lineage phenotype to isolate and clone CD44(hi) single......-cells that exhibited mesenchymal/Basal B and luminal/Basal A features, respectively. Herein we demonstrate in this and other triple-negative breast cancer cell lines that rather than CD44(hi)/CD24(-) mesenchymal-like Basal B cells, the CD44(hi)/CD24(lo) epithelioid Basal A cells retained classical cancer stem cell...... of estrogen receptor-negative human breast cancers. These findings strongly favor functional heterogeneity in the breast cancer cell compartment and hold promise for further refinements of prognostic marker profiling. Our work confirms that, in addition to cancer stem cells with mesenchymal-like morphology...

  18. Proteoglycan from salmon nasal cartridge [corrected] promotes in vitro wound healing of fibroblast monolayers via the CD44 receptor.

    Science.gov (United States)

    Ito, Gen; Kobayashi, Takeshi; Takeda, Yoshie; Sokabe, Masahiro

    2015-01-16

    Proteoglycans (PGs) are involved in various cellular functions including cell growth, adhesion, and differentiation; however, their physiological roles are not fully understood. In this study, we examined the effect of PG purified from salmon nasal cartilage (SNC-PG) on wound closure using tissue-cultured cell monolayers, an in vitro wound-healing assay. The results indicated that SNC-PG significantly promoted wound closure in NIH/3T3 cell monolayers by stimulating both cell proliferation and cell migration. SNC-PG was effective in concentrations from 0.1 to 10μg/ml, but showed much less effect at higher concentrations (100-1000μg/ml). The effect of SNC-PG was abolished by chondroitinase ABC, indicating that chondroitin sulfates (CSs), a major component of glycosaminoglycans (GAGs) in SNC-PG, are crucial for the SNC-PG effect. Furthermore, chondroitin 6-sulfate (C-6-S), a major CS of SNC-PG GAGs, could partially reproduce the SNC-PG effect and partially inhibit the binding of SNC-PG to cells, suggesting that SNC-PG exerts its effect through an interaction between the GAGs in SNC-PG and the cell surface. Neutralization by anti-CD44 antibodies or CD44 knockdown abolished SNC-PG binding to the cells and the SNC-PG effect on wound closure. These results suggest that interactions between CS-rich GAG-chains of SNC-PG and CD44 on the cell surface are responsible for the SNC-PG effect on wound closure.

  19. Contribution of the Receptor/Ligand Interaction Between CD44 and Osteopontin to Formation of Breast Cancer Metastases

    Science.gov (United States)

    2001-07-01

    taxol, cisplatin ), and CD44+ melanoma (which one?? Correct list??) engage this mechanism. In contrast, the non-metastatic SW403 colorectal does not...After 2 h, the phosphorylated protein was applied to a GSH -Sepharose column. The resin was washed with 5 volumes of PBS. The rOPN was eluted from the... GSH -Beads by incubating the beads with 100 U of factor Xa as described. After 2 h at 37oC, the released rOPN was applied to a chromatofocusing column

  20. 单抗CD44-生物素-亲和素系统提高软骨细胞与支架黏附能力的研究%CD44 monoclonal antibody-biotin-avidin binding system for the improvement of cell adhesion to scaffolds

    Institute of Scientific and Technical Information of China (English)

    林红; 周健; 沈龙祥; 阮玉辉; 戴文达; 郭常安; 陈峥嵘

    2012-01-01

    three-dimensional culture system were investigated.The histologic analysis was used to evaluate the cell growth in the scaffolds.The mRNA expression level of type Ⅱ collagen,aggrecan and sox9 was detected by using reverse transcription-polymerase chain reaction (RT-PCR).Results Group C showed better results in the cell spreading area,the cell proliferation rate and the mRNA expression level of type Ⅱ collagen,aggrecan and sox9 than group B,and group B more than group A,group C > group B > group A ( P < 0.05 ).The results showed that the cell exfoliation rate in group A was 2.17 times of that in group B which was 1.71 times of that in group C,group A > group B > group C ( P < 0.05 ).The histologic sections showed the proliferation of cells was exuberant and expression of extracellular matrix was stronger in group C,that in group B was between group C and group A in which they were weaker.Conclusion The CD44 monoclonal antibody-biotin-avidin binding system could improve the chondrocytes adhesion,proliferation and phenotypic expression in cartilage tissue engineering.

  1. Efficient CD44-targeted magnetic resonance imaging (MRI) of breast cancer cells using hyaluronic acid (HA)-modified MnFe2O4 nanocrystals

    Science.gov (United States)

    Lee, Taeksu; Lim, Eun-Kyung; Lee, Jaemin; Kang, Byunghoon; Choi, Jihye; Park, Hyo Seon; Suh, Jin-Suck; Huh, Yong-Min; Haam, Seungjoo

    2013-04-01

    Targeted molecular imaging with hyaluronic acid (HA) has been highlighted in the diagnosis and treatment of CD44-overexpressing cancer. CD44, a receptor for HA, is closely related to the growth of cancer including proliferation, metastasis, invasion, and angiogenesis. For the efficient detection of CD44, we fabricated a few kinds of HA-modified MnFe2O4 nanocrystals (MNCs) to serve as specific magnetic resonance (MR) contrast agents (HA-MRCAs) and compared physicochemical properties, biocompatibility, and the CD44 targeting efficiency. Hydrophobic MNCs were efficiently phase-transferred using aminated polysorbate 80 (P80) synthesized by introducing spermine molecules on the hydroxyl groups of P80. Subsequently, a few kinds of HA-MRCAs were fabricated, conjugating different ratios of HA on the equal amount of phase-transferred MNCs. The optimized conjugation ratio of HA against magnetic content was identified to exhibit not only effective CD44 finding ability but also high cell viability through in vitro experiments. The results of this study demonstrate that the suggested HA-MRCA shows strong potential to be used for accurate tumor diagnosis.

  2. Study of CD35, CD44s, and CD59 of human erythrocytes cytomembrane in hypercholesterolemia%高胆固醇血症红细胞膜CD35、CD44s、CD59分子表达研究

    Institute of Scientific and Technical Information of China (English)

    张页; 战祥辉; 何华亮; 苗会娜; 戴劲

    2011-01-01

    Objective To study the CD35, CD44s, CD59 molecular weight distribution of erythrocyte cytomembrane in hyper-cholesterolemia. Methods The CD35, CD44s, and CD59 molecular weight distribution in erythrocytes of 32 sub - healthy subjects with hypercholesterolemia( > 6mmol/L) was observed by flow cytometry and compared with that of control group. Results Compared with normal group, the CD35, CD44s, and CD59 average fluorescence intensity was reduced. Conclusions The reduction of CD35-,CD44s-, CD59 molecular weight distribution resulting in immune regulation functional disorder may be one of the causes of atherosclerosis.%目的 探讨高胆固醇血症红细胞膜表面CD35、CD44s、CD59分子的表达及意义.方法 采用对照研究方法,选取高胆固醇血症(>6 mmol/L)亚健康者和对照组各32例,流式细胞仪观察红细胞膜表面CD35、CD44s、CD59分子变化特征.结果 高胆固醇组红细胞膜CD35、CD44s、CD59平均荧光明显低于对照组,差异有统计学意义.结论 高胆固醇血症红细胞膜CD35、CD44s、CD59分子表达降低,导致其免疫调控功能紊乱,可能是启动动脉粥样硬化的原因之一.

  3. Osteopontin and the C-terminal peptide of thrombospondin-4 compete for CD44 binding and have opposite effects on CD133+ cell colony formation

    Directory of Open Access Journals (Sweden)

    Dobocan Monica C

    2009-10-01

    Full Text Available Abstract Background C21, the C-terminal peptide of thrombospondin-4, has growth promoting activity and was discovered as one of several erythropoietin-dependent endothelial proteins. C21 stimulates red cell formation in anemic mice and is a growth factor for CD34+ and CD36+ hematopoietic cells, skin fibroblasts and kidney epithelial cells. ROD1 has been identified as an intracellular mediator. Nothing is known about the existence of putative C21 receptors on plasma membranes of target cells. Findings We analyzed the nature of C21-binding proteins in cell lysates of skin fibroblasts using C21 affinity columns. The membrane receptor CD44 was identified as C21-binding protein by mass spectrometry. We were unable to demonstrate any direct involvement of CD44 on cell growth or the effect of C21 on cell proliferation. A soluble form of CD44 was synthesized in insect cells and purified from culture supernatants with a combination of PVDF filtration in the presence of ammonium sulphate and HPLC. Both osteopontin and hyaluronic acid competitively displaced Biotin-C21 binding to CD44. In a colony-forming assay using primitive CD133+ hematopoietic stem cells from cord blood, osteopontin and C21 had opposite effects and C21 reduced the inhibitory action of osteopontin. Conclusion CD44 is a C21-binding membrane protein. We could not demonstrate an involvement of CD44 in the proliferative action of C21. Nevertheless, based on the antagonism of C21 and osteopontin in hematopoietic precursors, we speculate that C21 could indirectly have a major impact on hematopoietic stem cell proliferation, by hindering osteopontin membrane binding at the level of the bone marrow niche.

  4. Induced growth inhibition, cell cycle arrest and apoptosis in CD133+/CD44+ prostate cancer stem cells by flavopiridol

    Science.gov (United States)

    SONER, BURAK CEM; AKTUG, HUSEYIN; ACIKGOZ, EDA; DUZAGAC, FAHRIYE; GUVEN, UMMU; AYLA, SULE; CAL, CAG; OKTEM, GULPERI

    2014-01-01

    Flavopiridol is a flavone that inhibits several cyclin-dependent kinases and exhibits potent growth-inhibitory activity, apoptosis and G1-phase arrest in a number of human tumor cell lines. Flavopiridol is currently undergoing investigation in human clinical trials. The present study focused on the effect of flavopiridol in cell proliferation, cell cycle progression and apoptosis in prostate cancer stem cells (CSCs). Therefore, cluster of differentiation 133 (CD133)+high/CD44+high prostate CSCs were isolated from the DU145 human prostate cancer cell line. The cells were treated with flavopiridol in a dose- and time-dependent manner to determine the inhibitory effect. Cell viability and proliferation were analyzed and the efficiency of flavopiridol was assessed using the sphere-forming assay. Flavopiridol was applied to monolayer cultures of CD133high/CD44high human prostate CSCs at the following final concentrations: 100, 300, 500 and 1000 nM. The cultures were incubated for 24, 48 and 72 h. The half maximal inhibitory concentration (IC50) value of the drug was determined as 500 nM for monolayer cells. Dead cells were analyzed prior and subsequent to exposure to increasing flavopiridol doses. Annexin-V and immunofluorescence analyses were performed for the evaluation of apoptotic pathways. According to the results, flavopiridol treatment caused significant growth inhibition at 500 and 1000 nM when compared to the control at 24 h. G0/G1 analysis showed a statistically significant difference between 100 and 500 nM (P<0.005), 100 and 1000 nM (P<0.001), 300 and 1000 nM (P<0.001), and 500 and 1000 nM (P<0.001). Flavopiridol also significantly influenced the cells in the G2/M phase, particularly at high-dose treatments. Flavopiridol induced growth inhibition and apoptosis at the IC50 dose (500 nM), resulting in a significant increase in immunofluorescence staining of caspase-3, caspase-8 and p53. In conclusion, the present results indicated that flavopiridol could be a

  5. Epithelial mesenchymal transition and pancreatic tumor initiating CD44+/EpCAM+ cells are inhibited by γ-secretase inhibitor IX.

    Directory of Open Access Journals (Sweden)

    Vindhya Palagani

    Full Text Available Pancreatic ductal adenocarcinoma (PDAC is an aggressive disease with a high rate of metastasis. Recent studies have indicated that the Notch signalling pathway is important in PDAC initiation and maintenance, although the specific cell biological roles of the pathway remain to be established. Here we sought to examine this question in established pancreatic cancer cell lines using the γ-secretase inhibitor IX (GSI IX to inactivate Notch. Based on the known roles of Notch in development and stem cell biology, we focused on effects on epithelial mesenchymal transition (EMT and on pancreatic tumor initiating CD44+/EpCAM+ cells. We analyzed the effect of the GSI IX on growth and epithelial plasticity of human pancreatic cancer cell lines, and on the tumorigenicity of pancreatic tumor initiating CD44+/EpCAM+ cells. Notably, apoptosis was induced after GSI IX treatment and EMT markers were selectively targeted. Furthermore, under GSI IX treatment, decline in the growth of pancreatic tumor initiating CD44+/EpCAM+ cells was observed in vitro and in a xenograft mouse model. This study demonstrates a central role of Notch signalling pathway in pancreatic cancer pathogenesis and identifies an effective approach to inhibit selectively EMT and suppress tumorigenesis by eliminating pancreatic tumor initiating CD44+/EpCAM+ cells.

  6. CD44 and TLR4 mediate hyaluronic acid regulation of Lgr5+ stem cell proliferation, crypt fission, and intestinal growth in postnatal and adult mice.

    Science.gov (United States)

    Riehl, Terrence E; Santhanam, Srikanth; Foster, Lynne; Ciorba, Matthew; Stenson, William F

    2015-12-01

    Hyaluronic acid, a glycosaminoglycan in the extracellular matrix, binds to CD44 and Toll-like receptor 4 (TLR4). We previously addressed the role of hyaluronic acid in small intestinal and colonic growth in mice. We addressed the role of exogenous hyaluronic acid by giving hyaluronic acid intraperitoneally and the role of endogenous hyaluronic acid by giving PEP-1, a peptide that blocks hyaluronic acid binding to its receptors. Exogenous hyaluronic acid increased epithelial proliferation but had no effect on intestinal length. PEP-1 resulted in a shortened small intestine and colon and diminished epithelial proliferation. In the current study, we sought to determine whether the effects of hyaluronic acid on growth were mediated by signaling through CD44 or TLR4 by giving exogenous hyaluronic acid or PEP-1 twice a week from 3-8 wk of age to wild-type, CD44(-/-), and TLR4(-/-) mice. These studies demonstrated that signaling through both CD44 and TLR4 were important in mediating the effects of hyaluronic acid on growth in the small intestine and colon. Extending our studies to early postnatal life, we assessed the effects of exogenous hyaluronic acid and PEP-1 on Lgr5(+) stem cell proliferation and crypt fission. Administration of PEP-1 to Lgr5(+) reporter mice from postnatal day 7 to day 14 decreased Lgr5(+) cell proliferation and decreased crypt fission. These studies indicate that endogenous hyaluronic acid increases Lgr5(+) stem cell proliferation, crypt fission, and intestinal lengthening and that these effects are dependent on signaling through CD44 and TLR4.

  7. Extranodal nasal NK/T-Cell Lymphoma: a rare oral presentation and FASN, CD44 and GLUT-1 Expression

    OpenAIRE

    2013-01-01

    O linfoma de células natural killers (NK)/T extranodal é um tumor maligno agressivo com características clinicopatológicas distintas, caracterizadas por invasão e destruição vasculares, necrose proeminente, fenótipo linfocítico citotóxico e uma forte associação com o vírus Epstein-Barr. Relatamos aqui um caso de linfoma de células NK/T nasal extranodal, envolvendo o seio maxilar, assoalho de órbita, e interessantemente estendendo-se para a cavidade oral através do osso alveolar e mucosa vesti...

  8. Melanoma cells undergo aggressive coalescence in a 3D Matrigel model that is repressed by anti-CD44

    Science.gov (United States)

    Voss, Edward; Kuhl, Spencer; Buchele, Emma C.; Klemme, Michael R.; Russell, Kanoe B.; Ambrose, Joseph; Soll, Benjamin A.; Bossler, Aaron; Milhem, Mohammed; Goldman, Charles

    2017-01-01

    Using unique computer-assisted 3D reconstruction software, it was previously demonstrated that tumorigenic cell lines derived from breast tumors, when seeded in a 3D Matrigel model, grew as clonal aggregates which, after approximately 100 hours, underwent coalescence mediated by specialized cells, eventually forming a highly structured large spheroid. Non-tumorigenic cells did not undergo coalescence. Because histological sections of melanomas forming in patients suggest that melanoma cells migrate and coalesce to form tumors, we tested whether they also underwent coalescence in a 3D Matrigel model. Melanoma cells exiting fragments of three independent melanomas or from secondary cultures derived from them, and cells from the melanoma line HTB-66, all underwent coalescence mediated by specialized cells in the 3D model. Normal melanocytes did not. However, coalescence of melanoma cells differed from that of breast-derived tumorigenic cell lines in that they 1) coalesced immediately, 2) underwent coalescence as individual cells as well as aggregates, 3) underwent coalescence far faster and 4) ultimately formed long, flat, fenestrated aggregates that were extremely dynamic. A screen of 51 purified monoclonal antibodies (mAbs) targeting cell surface-associated molecules revealed that two mAbs, anti-beta 1 integrin/(CD29) and anti-CD44, blocked melanoma cell coalescence. They also blocked coalescence of tumorigenic cells derived from a breast tumor. These results add weight to the commonality of coalescence as a characteristic of tumorigenic cells, as well as the usefulness of the 3D Matrigel model and software for both investigating the mechanisms regulating tumorigenesis and screening for potential anti-tumorigenesis mAbs. PMID:28264026

  9. 结肠癌细胞源exosomes的分离鉴定及其表面蛋白CD44v6的表达

    Institute of Scientific and Technical Information of China (English)

    刘朋飞; 朱磊; 李响; 孙一夫; 石毅; 丛登立; 王浩天; 周余来

    2010-01-01

    目的 探索结肠癌colo205细胞系对exosomes的分泌功能,并分析热休克作用对表面蛋白CD44v6表达量的影响.方法 采用超速离心法分离colo205细胞分泌的exosomes和热休克处理后colo205细胞分泌的exosomes(Heat shocked exosomes,HS-Exo),经220 nm微孔滤膜过滤纯化后,在透射电镜下观察其形态,并用SDS-PAGE方法分析细胞与exosomes的蛋白组成,Western Blot检测表面CD44v6的表达情况.结果 经透射电镜观察,正常exosomes与HS-Exo形态基本相似,均为圆形或椭圆形膜性囊泡,直径大多在30~100 nm之间,且经热休克处理的colo205细胞及其分泌的HS-Exo,在CD44v6表达量上较正常colo205细胞及exosomes显著上调(P<0.05).结论 结肠癌colo205细胞系可分泌exosomes,且超速离心结合滤膜过滤的分离纯化方法切实可行;热休克作用可使CD44v6表达上调,说明HS-Exo较exosomes可能在肿瘤免疫治疗方面有更重要的应用价值.

  10. Correlation of synovial cytokine expression with quality of cells used for autologous chondrocyte implantation in human knees

    DEFF Research Database (Denmark)

    Schmal, Hagen; Mehlhorn, Alexander T; Dovi-Akue, David

    2014-01-01

    content (TPC) and by ELISA for levels of basic fibroblast growth factor (bFGF), insulin-like growth factor 1, bone morphogenetic proteins 2 and 7 (BMP-2 and BMP-7). Cell quality following amplification for ACI was determined by surface expression of CD44, aggrecan, collagen type II and evaluation of cell...... characteristics. Data of 17 patients were supplemented by epidemiological parameters and clinical scores (IKDC, Lysholm, pain strength, subjective knee function). CD44 expression was positively associated with TPC and bFGF, and negatively linked to BMP-2 levels (p collagen type...... knee function after 1 year was positively linked to intraarticular BMP-2 concentrations (p collagen type II indicated a favorable clinical result reaching statistical significance in case of pain strength (p

  11. The depletion of ATM inhibits colon cancer proliferation and migration via B56γ2-mediated Chk1/p53/CD44 cascades.

    Science.gov (United States)

    Liu, Rui; Tang, Jiajia; Ding, Chaodong; Liang, Weicheng; Zhang, Li; Chen, Tianke; Xiong, Yan; Dai, Xiaowei; Li, Wenfeng; Xu, Yunsheng; Hu, Jin; Lu, Liting; Liao, Wanqin; Lu, Xincheng

    2017-04-01

    Ataxia-telangiectasia mutated (ATM) protein kinase is a major guardian of genomic stability, and its well-established function in cancer is tumor suppression. Here, we report an oncogenic role of ATM. Using two isogenic sets of human colon cancer cell lines that differed only in their ATM status, we demonstrated that ATM deficiency significantly inhibits cancer cell proliferation, migration, and invasion. The tumor-suppressive function of ATM depletion is not modulated by the compensatory activation of ATR, but it is associated with B56γ2-mediated Chk1/p53/CD44 signaling pathways. Under normal growth conditions, the depletion of ATM prevents B56γ2 ubiquitination and degradation, which activates PP2A-mediated Chk1/p53/p21 signaling pathways, leading to senescence and cell cycle arrest. CD44 was validated as a novel ATM target based on its ability to rescue cell migration and invasion defects in ATM-depleted cells. The activation of p53 induced by ATM depletion suppresses CD44 transcription, thus resulting in epithelial-mesenchymal transition (EMT) and cell migration suppression. Our study suggests that ATM has tumorigenic potential in post-formed colon neoplasia, and it supports ATM as an appealing target for improving cancer therapy.

  12. Post-translational allosteric activation of the P2X7 receptor through glycosaminoglycan chains of CD44 proteoglycans

    OpenAIRE

    Moura, GEDD; Lucena, SV; Lima, MA; Nascimento, FD; Gesteira, TF; Nader, HB; Paredes-Gamero, EJ; Tersariol, ILS

    2015-01-01

    Here, we present evidence for the positive allosteric modulation of the P2X7 receptor through glycosaminoglycans (GAGs) in CHO (cell line derived from the ovary of the Chinese hamster) cells. The marked potentiation of P2X7 activity through GAGs in the presence of non-saturating agonists concentrations was evident with the endogenous expression of the receptor in CHO cells. The presence of GAGs on the surface of CHO cells greatly increased the sensitivity to adenosine 5′-triphosphate and chan...

  13. Myc Gene Expression and CD44 in Cancer of Larynx and Metastasis%myc基因表达和CD44分子在喉癌淋巴结转移中的意义

    Institute of Scientific and Technical Information of China (English)

    赵研

    2002-01-01

    myc基因是较早出现的癌因之一.本文就该基因家族构成、作用方式、生物学特性及与细胞凋亡的关系进行综述.针对喉癌与该基因关系和淋巴结转移的意义进行观察分析.

  14. Reversibly crosslinked hyaluronic acid nanoparticles for active targeting and intelligent delivery of doxorubicin to drug resistant CD44+ human breast tumor xenografts.

    Science.gov (United States)

    Zhong, Yinan; Zhang, Jian; Cheng, Ru; Deng, Chao; Meng, Fenghua; Xie, Fang; Zhong, Zhiyuan

    2015-05-10

    The existence of drug resistance poses a major obstacle for the treatment of various malignant human cancers. Here, we report on reduction-sensitive reversibly crosslinked hyaluronic acid (HA) nanoparticles based on HA-Lys-LA conjugates (Lys: l-lysine methyl ester, LA: lipoic acid) for active targeting delivery of doxorubicin (DOX) to CD44+ breast cancers in vitro and in vivo, effectively overcoming drug resistance (ADR). HA-Lys-LA with degrees of substitution of 5, 10 and 28% formed robust nano-sized nanoparticles (152-219nm) following auto-crosslinking. DOX-loaded crosslinked nanoparticles revealed inhibited DOX release under physiological conditions while fast drug release in the presence of 10mM glutathione (GSH). Notably, MTT assays showed that DOX-loaded crosslinked HA-Lys-LA10 nanoparticles possessed an apparent targetability and a superior antitumor activity toward CD44 receptor overexpressing DOX-resistant MCF-7 human breast cancer cells (MCF-7/ADR). The in vivo pharmacokinetics and biodistribution studies in MCF-7/ADR tumor xenografts in nude mice showed that DOX-loaded crosslinked HA-Lys-LA10 nanoparticles had a prolonged circulation time and a remarkably high accumulation in the tumor (12.71%ID/g). Notably, DOX-loaded crosslinked HA-Lys-LA10 nanoparticles exhibited effective inhibition of tumor growth while continuous tumor growth was observed for mice treated with free drug. The Kaplan-Meier survival curves showed that in contrast to control groups, all mice treated with DOX-loaded crosslinked HA-Lys-LA10 nanoparticles survived over an experimental period of 44days. Importantly, DOX-loaded crosslinked HA nanoparticles caused low side effects. The reversibly crosslinked hyaluronic acid nanoparticles with excellent biocompatibility, CD44-targetability, and effective reversal of drug resistance have a great potential in cancer therapy.

  15. Quantum dots affect expression of CD133 surface antigen in melanoma cells

    Directory of Open Access Journals (Sweden)

    Steponkiene S

    2011-10-01

    Full Text Available Simona Steponkiene1-3, Simona Kavaliauskiene1, Rasa Purviniene4, Ricardas Rotomskis3,5, Petras Juzenas11Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, Radiumhospital, Oslo, Norway; 2Faculty of Natural Sciences, Vilnius University, Vilnius, Lithuania; 3Biomedical Physics Laboratory of Oncology Institute, Vilnius University, Vilnius, Lithuania; 4Immunology Laboratory of Oncology Institute, Vilnius University, Vilnius, Lithuania; 5Biophotonics Laboratory, Laser Research Center, Vilnius University, Vilnius, LithuaniaBackground: In novel treatment approaches, therapeutics should be designed to target cancer stem cells (CSCs. Quantum dots (QDs are a promising new tool in fighting against cancer. However, little is known about accumulation and cytotoxicity of QDs in CSCs.Methods: Accumulation and cytotoxicity of CdTe-MPA (mercaptopropionic acid QDs in CSCs were assessed using flow cytometry and fluorescence-activated cell sorting techniques as well as a colorimetric cell viability assay.Results: We investigated the expression of two cell surface-associated glycoproteins, CD44 and CD133, in four different cancer cell lines (glioblastoma, melanoma, pancreatic, and prostate adenocarcinoma. Only the melanoma cells were positive to both markers of CD44 and CD133, whereas the other cells were only CD44-positive. The QDs accumulated to a similar extent in all subpopulations of the melanoma cells. The phenotypical response after QD treatment was compared with the response after ionizing radiation treatment. The percentage of the CD44high-CD133high subpopulation decreased from 72% to 55%–58% for both treatments. The stem-like subpopulation CD44highCD133low/- increased from 26%–28% in the untreated melanoma cells to 36%–40% for both treatments.Conclusion: Treatment of melanoma cells with QDs results in an increase of stem-like cell subpopulations. The changes in phenotype distribution of the melanoma cells after

  16. Transgene expression in plants : Position-induced spatial and temporal variations of luciferase expression

    NARCIS (Netherlands)

    Leeuwen, van W.

    2001-01-01

    In this thesis we have examined the spatial and temporal aspects of gene expression and the position induced differences in transgene expression between individual transformants. For this purpose we imaged luciferase ( luc ) gene expression driven by three different promoters that are active through

  17. Salinomycin Promotes Anoikis and Decreases the CD44+/CD24- Stem-Like Population via Inhibition of STAT3 Activation in MDA-MB-231 Cells.

    Directory of Open Access Journals (Sweden)

    Hyunsook An

    Full Text Available Triple-negative breast cancer (TNBC is an aggressive tumor subtype with an enriched CD44+/CD24- stem-like population. Salinomycin is an antibiotic that has been shown to target cancer stem cells (CSC; however, the mechanisms of action involved have not been well characterized. The objective of the present study was to investigate the effect of salinomycin on cell death, migration, and invasion, as well as CSC-like properties in MDA-MB-231 breast cancer cells. Salinomycin significantly induced anoikis-sensitivity, accompanied by caspase-3 and caspase-8 activation and PARP cleavage, during anchorage-independent growth. Salinomycin treatment also caused a marked suppression of cell migration and invasion with concomitant downregulation of MMP-9 and MMP-2 mRNA levels. Notably, salinomycin inhibited the formation of mammospheres and effectively reduced the CD44+/CD24- stem-like population during anchorage-independent growth. These observations were associated with the inhibition of STAT3 phosphorylation (Tyr705. Furthermore, interleukin-6 (IL-6-induced STAT3 activation was strongly suppressed by salinomycin challenge. These findings support the notion that salinomycin may be potentially efficacious for targeting breast cancer stem-like cells through the inhibition of STAT3 activation.

  18. Salinomycin Promotes Anoikis and Decreases the CD44+/CD24- Stem-Like Population via Inhibition of STAT3 Activation in MDA-MB-231 Cells.

    Science.gov (United States)

    An, Hyunsook; Kim, Ji Young; Oh, Eunhye; Lee, Nahyun; Cho, Youngkwan; Seo, Jae Hong

    2015-01-01

    Triple-negative breast cancer (TNBC) is an aggressive tumor subtype with an enriched CD44+/CD24- stem-like population. Salinomycin is an antibiotic that has been shown to target cancer stem cells (CSC); however, the mechanisms of action involved have not been well characterized. The objective of the present study was to investigate the effect of salinomycin on cell death, migration, and invasion, as well as CSC-like properties in MDA-MB-231 breast cancer cells. Salinomycin significantly induced anoikis-sensitivity, accompanied by caspase-3 and caspase-8 activation and PARP cleavage, during anchorage-independent growth. Salinomycin treatment also caused a marked suppression of cell migration and invasion with concomitant downregulation of MMP-9 and MMP-2 mRNA levels. Notably, salinomycin inhibited the formation of mammospheres and effectively reduced the CD44+/CD24- stem-like population during anchorage-independent growth. These observations were associated with the inhibition of STAT3 phosphorylation (Tyr705). Furthermore, interleukin-6 (IL-6)-induced STAT3 activation was strongly suppressed by salinomycin challenge. These findings support the notion that salinomycin may be potentially efficacious for targeting breast cancer stem-like cells through the inhibition of STAT3 activation.

  19. ABCG2、MDR1基因表达水平与5-氟尿嘧啶耐药的CD44+SGC-7901/5-Fu多药耐药关系

    Institute of Scientific and Technical Information of China (English)

    李跃军; 卓德斌

    2014-01-01

    目的:探讨乳腺癌耐药蛋白(ABCG2)、P-糖蛋白(MDR1)基因表达水平与5-氟尿嘧啶(5-Fu)耐药的 CD44+SGC-7901/5-Fu多药耐药关系。方法采用反复短期暴露并逐步递增药物浓度法建立5-Fu耐药胃癌细胞株SGC7901/5-Fu,鼠抗人CD44抗体,流式细胞术( FACS)检测分选CD44+SGC-7901/5-Fu。四甲基偶氮唑蓝( MTT)比色法测定SGC-7901/5-Fu、CD44+SGC-7901/5-Fu 、CD44-SGC-7901/5-Fu细胞5-Fu耐药指数及交叉耐药性。 RT-PCR方法分别检测对数期生长的 SGC-7901、SGC-7901/5-Fu、CD44+SGC-7901/5-Fu 、CD44-SGC-7901/5-Fu细胞 ABCG2、MDR1 mRNA表达。结果 CD44+SGC-7901/5-Fu相对于SGC-7901细胞的耐药指数为12.5(P<0.05),但CD44-SGC-7901/5-Fu相对于SGC-7901细胞的耐药指数为1.2(P>0.05)。 CD44+SGC-7901/5-Fu对ADM、MMC和DDP也有交叉耐药性,CD44-SGC-7901/5-Fu对ADM、MMC和DDP无交叉耐药性。与对照组(正常SGC-790)细胞比较,ABCG2、MDR1在5-Fu耐药的 SGC-7901细胞株中表达明显增强(P<0.05)。与5-Fu 耐药的 SGC-7901细胞株比较, CD44+SGC-7901/5-Fu细胞株ABCG2、MDR1表达继续增加(P<0.05);。与5-Fu耐药的 SGC-7901细胞株比较,CD44-SGC-7901/5-Fu细胞 ABCG2、MDR1表达差别无统计学意义( P>0.05)。结论 CD44+SGC-7901/5-Fu 细胞株对5-Fu 耐药性明显增强,其多药耐药机制可能与 ABCG2、MDR1mRNA表达增加相关。

  20. Position-independent expression of transgenes in zebrafish.

    Science.gov (United States)

    Caldovic, L; Agalliu, D; Hackett, P B

    1999-10-01

    The variability in expression patterns of transgenes, caused by the influence of neighboring chromatin, is called 'position effect'. Border elements are DNA sequences, which have the ability to alleviate position effects. The abilities of two types of border elements, scs/scs' from the D. melanogaster 87A7 heat shock locus and the A-element from the chicken lysozyme gene, to protect transgenes from position effects were quantified in developing zebrafish embryos. The transgenic construct used was FV3CAT, which consists of the carp beta-actin transcriptional regulatory region, the chloramphenicol acetyltransferase (CAT) gene and the 3'-untranslated region from the Chinook salmon growth hormone gene. FV3CAT constructs flanked by either scs/scs'-elements or A-elements were introduced into zebrafish chromosomes and the spatial and temporal expression patterns of the transgenes were quantified in multiple generations of transgenic zebrafish. Levels of transgene expression were uniform in the pre-differentiated and fully differentiated populations of cells present during embryonic development. Levels of transgene expression were proportional to the numbers of integrated transgenes. Expression of transgenes per cell varied less than two-fold in different transgenic lines. Both types of border elements were able to prevent the influences of neighboring chromatin on transgene expression through three generations of fish. The results are consistent with the ability of border elements to function with equal efficiencies in the many cell types found in vertebrates. Thus, inclusion of border elements in genetic constructs can provide reliable and reproducible levels of gene expression in multiple lines of fish.

  1. Novel CD44 receptor targeting multifunctional “nano-eggs” based on double pH-sensitive nanoparticles for co-delivery of curcumin and paclitaxel to cancer cells and cancer stem cells

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Daquan, E-mail: cdq1981@126.com [Peking University, School of Pharmaceutical Sciences, Health Science Center (China); Wang, Guohua [China Academy of Chinese Medical Sciences, Institute of Chinese Materia Madica (China); Song, Weiguo [Shouguang Fukang Pharmceutial Co., Ltd. (China); Zhang, Qiang, E-mail: zqdodo@bjmu.edu.cn [Peking University, School of Pharmaceutical Sciences, Health Science Center (China)

    2015-10-15

    Most anticancer drugs cannot kill cancer stem cells (CSCs) effectively, which lead to the failure of anticancer chemotherapy, such as relapse and metastasis. In this study, we prepared a multifunctional oligosaccharides of hyaluronan (oHA) conjugates, oHA-histidine-menthone 1,2-glycerol ketal (oHM). The oHM conjugates possess pH-sensitive menthone 1,2-glycerol ketal (MGK) as hydrophobic moieties and oHA as the target of CD44 receptor. Anticancer drugs, curcumin(Cur) and paclitaxel(PTX), were loaded into oHM micelles via self-assembly. Then, oHM micelles were mineralized through controlled deposition of inorganic calcium and phosphate ions on the nanoparticular shell via a sequential addition method to fabricate the “nano-eggs.” The formed nano-eggs had a smaller size (120.6 ± 4.5 nm) than oHM micelles (158.6 ± 6.4 nm), indicating that mineralization made the appearance of compact nanoparticles. Interestingly, when the nano-eggs were put into the acidic conditions (pH 6.5), their outer shell(inorganic minerals) will be destroyed with the larger size, while the “nano-eggs” were stable under pH 7.4. For both nano-eggs and oHM micelles, the Cur and PTX were released in a sustained manner depending on the pH of the solution. However, the nano-eggs showed much lower released than the oHM micelles due to the dissolution of the inorganic minerals and pH-sensitive ketal at mildly acidic environments (pH 6.5). In vivo study, the nano-eggs could get to the tumor site more effectively than oHM micelles. CSCs were sorted by a side population assay from MDA-MB-231 breast cancer cell lines over-expressing CD44 receptors. Antitumor activity was also evaluated on MDA-MB-231 xenografts in nude mice. The antitumor efficacy indicated that nano-eggs with co-delivery of Cur and PTX produced the strongest antitumor efficacy, and nano-eggs showed strong activity against cancer stem cells. These double pH-sensitive nano-eggs may provide a promising strategy for drug

  2. Effects of anti-CD44 monoclonal antibody IM7 carried with chitosan polylactic acid-coated nano-particles on the treatment of ovarian cancer

    Science.gov (United States)

    Yang, Yizhuo; Zhao, Xinghui; Li, Xiuli; Yan, Zhifeng; Liu, Zhongyu; Li, Yali

    2017-01-01

    Failure in early diagnosis and ineffective treatment are the major causes of ovarian cancer mortality. Hyaluronan and its receptor, cluster of differentiation (CD)44, have been considered to be valid targets for treating cancer. The anti-CD44 monoclonal antibody IM7 is effective in treating ovarian cancer; however, its toxicity should not be ignored. The present study has developed a new drug carrier system composed of chitosan nano-particles coated with polylactic acid (PLA) to improve the treatment efficacy and reduce toxicity. An ionic crosslinking method and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride/N-hydroxysuccinimide were used to prepare the IM7 antibody, which was loaded with chitosan nano-particles. The surfaces of the nano-particles were coated with PLA to generate PLA-chitosan-IM7. Subsequently, transmission electron microscopy (TEM) was used to observe the size and zeta potential of the nano-particles. In addition, a spectrophotometer was used to calculate the loading rate and release rate of the nano-particles in acidic and neutral environments. MTT assay was used to evaluate the anti-proliferative effect of PLA-chitosan-IM7 on the human ovarian cancer cell line HO-8910PM. In addition, an in vivo imaging system was used to further investigate the effect of PLA-chitosan-IM7 on the treatment of mice with ovarian cancer. A total of 35 days subsequent to PLA-chitosan-IM7 treatment, all animals were sacrificed by CO2, and the tumors were removed and weighted. The PLA-chitosan-IM7 nano-particles were successfully prepared, since TEM revealed that their size was 300–400 nm and their zeta potential was +25 mV. According to the spectrophotometry results, the loading rate was 52%, and PLA-chitosan-IM7 exhibited good resistance to acids. MTT assay demonstrated that PLA-chitosan-IM7 could suppress the proliferation of HO-8910PM cells in vitro. The in vivo imaging system revealed that PLA-chitosan-IM7 was effective in controlling the

  3. The expression of cancer stem cell markers in human nasopharyngeal carcinoma cell lines%肿瘤干细胞标志物在鼻咽癌细胞株中的表达

    Institute of Scientific and Technical Information of China (English)

    刘观成; 何晓松; 宣广旭; 王文华; 陈文文

    2015-01-01

    Objective To explore the expression of cancer stem cells(CSC) markers named ABCG2,CD44,CD34 in hu man nasopharyngeal carcinoma(NPC) CNE-2,5-8F and 6-10B cell lines to provide the basis of CSC markers research of NPC. Methods The NPC cell lines of CNE2,5-8F and 6-10B were cultivated regularly,of which,ABCG2,CD44,CD34 cell ratio was detected with flow cytometry. Results ABCG2 positive cells accounted about 0.1%,18.6%and 19.9%in the CNE-2,5-8F,6-10B cell lines. CD44 positive cells accounted 99.5%,93.2%and 99.1%in the CNE-2,5-8F and 6-10B cell lines. CD34 positive cells accounted 0,3.0%and 0.1%in the CNE2,5-8F,and 6-10B cell lines. ABCG2+CD44+cell interation accounted about 11.6%and ABCG2+CD44+cell interation accounted about 0 in 5-8F cell lines. Conclusion The expression proportion of CD34+in the 5-8F and 6-10B cell lines confirms to CSC markers of the CSC theory. CD34 may be deemed as a candidate marker of nasopharyn-geal neoplas.%目的探索肿瘤干细胞(CSC)标志物ABCG2、CD44、CD34在鼻咽癌细胞株CNE2、5-8F和6-10B中的表达情况,为选择CSC标志物进行鼻咽癌CSC样研究奠定基础。方法常规培养CNE2、5-8F和6-10B这3种鼻咽癌细胞株,用流式细胞仪检测3种鼻咽癌细胞株中ABCG2、CD44、CD34细胞比例及其交互情况。结果 ABCG2在CNE2、5-8F和6-10B这3种鼻咽癌细胞株中表达率分别为0.1%、18.6%、19.9%;CD44在CNE2、5-8F和6-10B中表达率分别为99.5%、93.2%、99.1%;CD34在CNE2、5-8F和6-10B 中表达率分别为0、3.0%、0.1%。在5-8F 中,ABCG2+CD44+细胞交互比例为11.6%,ABCG2+CD34+细胞交互比例为0。结论5-8F和6-10B中CD34+细胞比例与CSC理论中CSC的比例相符。CD34可以作为鼻咽癌CSC的候选标志物。

  4. Levels of v5 and v6 CD44 splice variants in serum of patients with colorectal cancer are not correlated with pT stage,histopathological grade of malignancy and clinical features

    Institute of Scientific and Technical Information of China (English)

    Bogdan Zalewski

    2004-01-01

    AIM: This study was designed to compare the levels of v5and v6 splice variants of CD44 evaluated using ELISA test in the serum of patients with colorectal cancer in different stages of progression of the disease estimated in pT stage according to WHO score, histopathological grade of malignancy and some clinicopathological features.METHODS: The serum obtained from 114 persons with colorectal adenocarcinomas was examined using ELISA method. pT stage and grade of malignancy of the tumour were examined in formalin fixed and paraffin embedded materials obtained during operation.RESULTS: Only the level of CD44 v5 in the serum of patients before operation with G2 pT4 tumour was lower than that in other probes and the difference was statistically significant.We did not find any other correlations between the level of v5 and v6 CD44 variants and other evaluated parameters.CONCLUSION: The level of CD44 v5 and v6 estimated by ELISA test in the serum can not be used as a prognostic factor in colorectal cancer.

  5. 宫颈癌及其淋巴转移灶淋巴归巢受体L-selectin、CD44、ICAM-1表达的对比研究

    Institute of Scientific and Technical Information of China (English)

    陈江平; 张凡; 常永霞; 张九鸿; 赵秀芳; 成日青; 舒丽莎

    2009-01-01

    目的 探讨L-selectin、CD44、ICAM-1对宫颈癌淋巴转移的作用.方法 应用免疫组织化学方法 对比检测35例宫颈鳞状细胞癌原发灶及其淋巴转移灶中L-selectin、CD44、ICAM-1的表达.结果 L-selectin淋巴转移灶中阳性率明显低于原发灶(P<0.05);CD44淋巴转移灶中阳性率与原发灶无明显区别(P>0.05);ICAM-1淋巴转移灶中阳性率明显高于原发灶(P<0.01);L-selectin与CD44、L-selectin与ICAM-1在原发灶中表达水平之间存在明显相关(r=0.873 7,P<0.01;r=0.795,P<0.01),CD44、ICAM-1在原发灶中表达水平呈明显负相关(r=-0.658 3,P<0.01);淋巴转移灶中L-selectin、CD44、ICAM-1表达水平之间均不存在相关;L-selectin原发灶与淋巴转移中表达水平之间存在明显相关(r=0.753 4,P<0.01),CD44原发灶与淋巴转移中表达水平之间无明显相关,ICAM-1原发灶与淋巴转移中表达水平之间存在明显负相关(r=-0.536 1,P<0.01).原发灶中L-selectin表达与肿瘤分化、淋巴结转移存在相关(r=0.842 0,P<0.01;r=0.768 9,P<0.01);CD44表达与肿瘤侵犯深度、淋巴结转移之间存在相关(r=0.678 2,P<0.01;r=0.863 4,P<0.01);ICAM-1表达与淋巴结转移存在相关(r=0.654 8,P<0.01).结论 L-selectin、CD44、ICAM-1都与宫颈癌淋巴转移相关,其中L-selectin、CD44在淋巴转移的始动阶段发挥重要作用.

  6. High levels of the adhesion molecule CD44 on leukemic cells generate acute myeloid leukemia relapse after withdrawal of the initial transforming event.

    Science.gov (United States)

    Quéré, R; Andradottir, S; Brun, A C M; Zubarev, R A; Karlsson, G; Olsson, K; Magnusson, M; Cammenga, J; Karlsson, S

    2011-03-01

    Multiple genetic hits are detected in patients with acute myeloid leukemia (AML). To investigate this further, we developed a tetracycline-inducible mouse model of AML, in which the initial transforming event, overexpression of HOXA10, can be eliminated. Continuous overexpression of HOXA10 is required to generate AML in primary recipient mice, but is not essential for maintenance of the leukemia. Transplantation of AML to secondary recipients showed that in established leukemias, ∼80% of the leukemia-initiating cells (LICs) in bone marrow stopped proliferating upon withdrawal of HOXA10 overexpression. However, the population of LICs in primary recipients is heterogeneous, as ∼20% of the LICs induce leukemia in secondary recipients despite elimination of HOXA10-induced overexpression. Intrinsic genetic activation of several proto-oncogenes was observed in leukemic cells resistant to inactivation of the initial transformation event. Interestingly, high levels of the adhesion molecule CD44 on leukemic cells are essential to generate leukemia after removal of the primary event. This suggests that extrinsic niche-dependent factors are also involved in the host-dependent outgrowth of leukemias after withdrawal of HOXA10 overexpression event that initiates the leukemia.

  7. Alpha-fetoprotein expression is a potential prognostic marker in hepatocellular carcinoma

    Institute of Scientific and Technical Information of China (English)

    Dénes G(o)r(o)g; János Reg(o)ly-Mérei; Sándor Paku; László Kopper; Péter Nagy

    2005-01-01

    AIM: To characterize the alpha-fetoprotein (AFP) positive and negative hepatocellular carcinoma (HCC) samples.METHODS: Thirty-seven paraffin-embedded human HCC samples were analyzed by immunohistochemistry for the following antigens: AFP, β-catenin, p53, CD44, MSH-2,MLH-1, and HNF-4. The tumors were divided into two groups based on the AFP expression. The immunophenotypic data and important clinical parameters were studied between the two groups.RESULTS: Twenty-one of the thirty-seven examined HCCs were AFP positive. Seven with nuclear p53 staining were AFP positive, while seven tumors with nuclear β-catenin staining were AFP negative. CD44 staining and high histological tumor grade were more frequent among the AFP-positive HCCs. The other immunophenotypical and dinical parameters did not show statistically significant difference in their distribution between the AFP positive and negative samples.CONCLUSION: AFP expression in HCC correlates with unfavorable prognostic factors, while nuclear β-catenin positivity is more common among the AFP-negative liver tumors. This observation supports the microarray data onin vivo human tumors.

  8. Facial expression of positive emotions in individuals with eating disorders.

    Science.gov (United States)

    Dapelo, Marcela M; Hart, Sharon; Hale, Christiane; Morris, Robin; Lynch, Thomas R; Tchanturia, Kate

    2015-11-30

    A large body of research has associated Eating Disorders with difficulties in socio-emotional functioning and it has been argued that they may serve to maintain the illness. This study aimed to explore facial expressions of positive emotions in individuals with Anorexia Nervosa (AN) and Bulimia Nervosa (BN) compared to healthy controls (HC), through an examination of the Duchenne smile (DS), which has been associated with feelings of enjoyment, amusement and happiness (Ekman et al., 1990). Sixty participants (AN=20; BN=20; HC=20) were videotaped while watching a humorous film clip. The duration and intensity of DS were subsequently analyzed using the facial action coding system (FACS) (Ekman and Friesen, 2003). Participants with AN displayed DS for shorter durations than BN and HC participants, and their DS had lower intensity. In the clinical groups, lower duration and intensity of DS were associated with lower BMI, and use of psychotropic medication. The study is the first to explore DS in people with eating disorders, providing further evidence of difficulties in the socio-emotional domain in people with AN.

  9. Differential expression of growth factor receptors and membrane-bound tumor markers for imaging in male and female breast cancer.

    Directory of Open Access Journals (Sweden)

    Jeroen F Vermeulen

    Full Text Available INTRODUCTION: Male breast cancer accounts for 0.5-1% of all breast cancers and is generally diagnosed at higher stage than female breast cancers and therefore might benefit from earlier detection and targeted therapy. Except for HER2 and EGFR, little is known about expression of growth factor receptors in male breast cancer. We therefore investigated expression profiles of growth factor receptors and membrane-bound tumor markers in male breast cancer and gynecomastia, in comparison with female breast cancer. METHODS: Tissue microarrays containing 133 male breast cancer and 32 gynecomastia cases were stained by immunohistochemistry for a panel of membrane-bound targets and compared with data on 266 female breast cancers. RESULTS: Growth factor receptors were variably expressed in 4.5% (MET up to 38.5% (IGF1-R of male breast cancers. Compared to female breast cancer, IGF1-R and carbonic anhydrase 12 (CAXII were more frequently and CD44v6, MET and FGFR2 less frequently expressed in male breast cancer. Expression of EGFR, HER2, CAIX, and GLUT1 was not significantly different between male and female breast cancer. Further, 48.1% of male breast cancers expressed at least one and 18.0% expressed multiple growth factor receptors. Since individual membrane receptors are expressed in only half of male breast cancers, a panel of membrane markers will be required for molecular imaging strategies to reach sensitivity. A potential panel of markers for molecular imaging, consisting of EGFR, IGF1-R, FGFR2, CD44v6, CAXII, GLUT1, and CD44v6 was positive in 77% of male breast cancers, comparable to female breast cancers. CONCLUSIONS: Expression patterns of growth factor receptors and hypoxia membrane proteins in male breast cancer are different from female breast cancer. For molecular imaging strategies, a putative panel consisting of markers for EGFR, IGF1-R, FGFR2, GLUT1, CAXII, CD44v6 was positive in 77% of cases and might be considered for development of

  10. Differential Expression of Stem Cell Markers in Ocular Surface Squamous Neoplasia

    Science.gov (United States)

    Mishra, Dilip Kumar; Veena, Uppala; Kaliki, Swathi; Kethiri, Abhinav Reddy; Sangwan, Virender S.; Ali, Mohammed Hasnat; Naik, Milind N.; Singh, Vivek

    2016-01-01

    Ocular Surface Squamous Neoplasm (OSSN) is the neoplasia arising from the conjunctiva, cornea and limbus. OSSN ranges from mild, moderate, severe dysplasia, carcinoma in situ (CIS) to squamous cell carcinoma (SCC). Recent findings on cancer stem cells theory indicate that population of stem-like cell as in neoplasia determines its heterogeneity and complexity leading to varying tumor development of metastatic behavior and recurrence. Cancer stem cell markers are not much explored in the cases of OSSN. In the present study, we aim to evaluate the expression of stem cells using stem cell markers mainly p63, ABCG2, c-KIT (CD117) and CD44 in OSSN tissue, which could have prognostic significance. The present study tries for the first time to explore expression of these stem markers in the cases of OSSN. These cases are subdivided into two groups. One group comprises of carcinoma in situ (n = 6) and the second group comprises of invasive carcinoma (n = 6). The mean age at presentation was 52 years; with 53 years for CIS group and 52 years for SCC group. From each group section from the paraffin block were taken for the IHC staining of p63, c-Kit, ABCG2 and CD44. Our experiments show high expression of P63 and CD44 in the cases of CIN and SCC. Both CIS and SCC displayed positive staining with p63, with more than 80% cells staining positive. However minimal expression of c-kit in both CIN and SCC. But surprisingly we got high expression of ABCG2 in cases of carcinoma in situ as compared to that of invasive squamous cell carcinoma. More than 50% of cells showed CD44 positivity in both CIS and SCC groups. Our results show for the first time that these four stem cells especially the limbal epithelium stem cells play a vital role in the genesis of OSSN but we need to explore more cases before establishing its clinical and biological significance. PMID:27584160

  11. Stealth CD44-targeted hyaluronic acid supramolecular nanoassemblies for doxorubicin delivery: probing the effect of uncovalent pegylation degree on cellular uptake and blood long circulation.

    Science.gov (United States)

    Han, Xiaopeng; Li, Zhenbao; Sun, Jin; Luo, Cong; Li, Lin; Liu, Yuhai; Du, Yuqian; Qiu, Shuhong; Ai, Xiaoyu; Wu, Chunnuan; Lian, He; He, Zhonggui

    2015-01-10

    Stealth active targeting nanoparticles (NPs) usually include two types of ligand sites: ligand anchored on distal ends of the polyethylene glycol (PEG) and ligand buried under pegylated layer. The latter typical case is hyaluronic acid (HA)-based NPs; however, there is little information available for the latter NPs about effect of the optimal density of surface PEG coating on the blood circulation time, cellular uptake and in vivo anticancer activity. Thus, in this study, in order to optimize the anticancer effects of HA-based NPs, we focus on how uncovalent pegylation degree modulates blood circulation time and cellular uptake of HA-based NPs. We firstly designed a new double-hydrophilic copolymer by conjugating HP-β-cyclodextrin with HA, and this carrier was further pegylated with adamantyl-peg (ADA-PEG) to form inclusion complex HA-HPCD/ADA-PEG, termed as HCPs. The supramolecular nanoassemblies were fabricated by host-guest and polar interactions between HCPs and doxorubicin (Dox), with vitamin E succinate (VES) being a nanobridge. Despite the active recognition between HA and CD44 receptor, the cellular uptake and targeting efficiency of HA-NPs decreased with the increasing peg density, demonstrating HA was partly buried by high density peg coating. However, the high density of peg coating was beneficial to long circulation time, tumor biodistribution and anticancer activity in vivo. NPs with 5% peg coating had the optimal cellular targeting efficiency in vitro and anticancer effects in vivo. The findings suggest that balancing long circulation property and cellular uptake is important to achieve the optimal antitumor efficacy for pegylated HA-based NPs, and that PEG coating densities cannot be extended beyond a certain density for shielding effect without compromising the efficacy of hyaluronic acid targeted delivery.

  12. Body Cues, Not Facial Expressions, Discriminate Between Intense Positive and Negative Emotions

    NARCIS (Netherlands)

    Aviezer, H.; Trope, Y.; Todorov, A.T.

    2012-01-01

    The distinction between positive and negative emotions is fundamental in emotion models. Intriguingly, neurobiological work suggests shared mechanisms across positive and negative emotions. We tested whether similar overlap occurs in real-life facial expressions. During peak intensities of emotion,

  13. YY1 positively regulates human UBIAD1 expression

    Energy Technology Data Exchange (ETDEWEB)

    Funahashi, Nobuaki, E-mail: nfunahashi@ri.ncgm.go.jp [Department of Hygienic Sciences, Kobe Pharmaceutical University, Kobe (Japan); Department of Metabolic Disorder, Diabetes Research Center, Research Institute, National Center for Global Health and Medicine, Tokyo (Japan); Hirota, Yoshihisa [Department of Hygienic Sciences, Kobe Pharmaceutical University, Kobe (Japan); Faculty of Pharmaceutical Sciences, Suzuka University of Medical Science, Suzuka (Japan); Nakagawa, Kimie; Sawada, Natumi; Watanabe, Masato [Department of Hygienic Sciences, Kobe Pharmaceutical University, Kobe (Japan); Suhara, Yoshitomo [Department of Bioscience and Engineering, Shibaura Institute of Technology, Saitama (Japan); Okano, Toshio [Department of Hygienic Sciences, Kobe Pharmaceutical University, Kobe (Japan)

    2015-05-01

    Vitamin K is involved in bone formation and blood coagulation. Natural vitamin K compounds are composed of the plant form phylloquinone (vitamin K{sub 1}) and a series of bacterial menaquionones (MK-n; vitamin K{sub 2}). Menadione (vitamin K{sub 3}) is an artificial vitamin K compound. MK-4 contains 4-isoprenyl as a side group in the 2-methyl-1,4-naphthoquinone common structure and has various bioactivities. UbiA prenyltransferase domain containing 1 (UBIAD1 or TERE1) is the menaquinone-4 biosynthetic enzyme. UBIAD1 transcript expression significantly decreases in patients with prostate carcinoma and overexpressing UBIAD1 inhibits proliferation of a tumour cell line. UBIAD1 mRNA expression is ubiquitous in mouse tissues, and higher UBIAD1 mRNA expression levels are detected in the brain, heart, kidneys and pancreas. Several functions of UBIAD1 have been reported; however, regulation of the human UBIAD1 gene has not been elucidated. Here we report cloning and characterisation of the human UBIAD1 promoter. A 5′ rapid amplification of cDNA ends analysis revealed that the main transcriptional start site was 306 nucleotides upstream of the translation initiation codon. Deletion and mutation analyses revealed the functional importance of the YY1 consensus motif. Electrophoretic gel mobility shift and chromatin immunoprecipitation assays demonstrated that YY1 binds the UBIAD1 promoter in vitro and in vivo. In addition, YY1 small interfering RNA decreased endogenous UBIAD1 mRNA expression and UBIAD1 conversion activity. These results suggest that YY1 up-regulates UBIAD1 expression and UBIAD1 conversion activity through the UBIAD1 promoter. - Highlights: • We cloned the human UBIAD1 promoter. • The functional importance of the YY1 motif was identified in the UBIAD1 promoter. • YY1 binds the UBIAD1 promoter in vitro and in vivo. • Knockdown of YY1 significantly decreased UBIAD1 expression. • YY1 up-regulates UBIAD1 conversion activity through the UBIAD1

  14. Expressiveness and Robustness of First-Price Position Auctions

    OpenAIRE

    Dütting, Paul; Fischer, Felix; Parkes, David C.

    2013-01-01

    Since economic mechanisms are often applied to very different instances of the same problem, it is desirable to identify mechanisms that work well in a wide range of circumstances. We pursue this goal for a position auction setting and specifically seek mechanisms that guarantee good outcomes under both complete and incomplete information. A variant of the generalized first-price mechanism with multi-dimensional bids turns out to be the only standard mechanism able to achieve this goal, even ...

  15. Positive, but Not Negative, Facial Expressions Facilitate 3-Month-Olds' Recognition of an Individual Face

    Science.gov (United States)

    Brenna, Viola; Proietti, Valentina; Montirosso, Rosario; Turati, Chiara

    2013-01-01

    The current study examined whether and how the presence of a positive or a negative emotional expression may affect the face recognition process at 3 months of age. Using a familiarization procedure, Experiment 1 demonstrated that positive (i.e., happiness), but not negative (i.e., fear and anger) facial expressions facilitate infants' ability to…

  16. Understanding the positive and negative effects of emotional expressions in organizations: EASI does it

    NARCIS (Netherlands)

    van Kleef, G.A.

    2014-01-01

    Emotions have a pervasive impact on organizational behavior. They do not just influence people’s own actions; when expressed, emotions may also exert influence on other organization members who perceive the expressions. Sometimes emotional expressions have ‘symmetrical’ effects, in that positive exp

  17. Implication of expression of Nanog in prostate cancer cells and their stem cells.

    Science.gov (United States)

    Gong, Chen; Liao, Hui; Guo, Fengjin; Qin, Liang; Qi, Jun

    2012-04-01

    Recent studies suggested that the prostate cancer may arise from prostate cancer stem cells that share some same characteristics with normal stem cells. The purpose of this study was to detect the differences of Nanog expression between PC3 prostate cancer cell line and its tumor stem cells, and the relationship was preliminarily examined between Nanog and prostate cancer and its tumor stem cells. By using magnetic active cell sorting (MACS), we isolated a population of CD44(+)/CD133(+) prostate cancer cells that display stem cell characteristics from PC3 cell line. Immunohistochemistry revealed positive expressions of CD44, CD133 and α(2)β(1)-integin in the isolated cells. CCK-8 analysis showed that isolated cells had a strong proliferative ability. The formation of the cell spheres in serum-free medium and holoclones in serum-supplied medium showed that the cells were capable of self-renewing, indicating that the isolated cells were a population of cancer stem-like cells derived from PC3 cell line. Western blotting exhibited that the isolated cells had higher experession of Nanog, an embryonic stem marker, as compared with PC3 cells. Our study showed that Nanog might be helpful in sustaining the self-renewal and the undifferentiation of prostate cancer stem cells, and may serve as a marker for prostate cancer stem cells for isolation and identification.

  18. Body cues, not facial expressions, discriminate between intense positive and negative emotions.

    Science.gov (United States)

    Aviezer, Hillel; Trope, Yaacov; Todorov, Alexander

    2012-11-30

    The distinction between positive and negative emotions is fundamental in emotion models. Intriguingly, neurobiological work suggests shared mechanisms across positive and negative emotions. We tested whether similar overlap occurs in real-life facial expressions. During peak intensities of emotion, positive and negative situations were successfully discriminated from isolated bodies but not faces. Nevertheless, viewers perceived illusory positivity or negativity in the nondiagnostic faces when seen with bodies. To reveal the underlying mechanisms, we created compounds of intense negative faces combined with positive bodies, and vice versa. Perceived affect and mimicry of the faces shifted systematically as a function of their contextual body emotion. These findings challenge standard models of emotion expression and highlight the role of the body in expressing and perceiving emotions.

  19. Anti-ALK Antibodies in Patients with ALK-Positive Malignancies Not Expressing NPM-ALK.

    Science.gov (United States)

    Damm-Welk, Christine; Siddiqi, Faraz; Fischer, Matthias; Hero, Barbara; Narayanan, Vignesh; Camidge, David Ross; Harris, Michael; Burke, Amos; Lehrnbecher, Thomas; Pulford, Karen; Oschlies, Ilske; Siebert, Reiner; Turner, Suzanne; Woessmann, Wilhelm

    2016-01-01

    Patients with Nucleophosmin (NPM)- Anaplastic Lymphoma Kinase (ALK) fusion positive Anaplastic Large Cell Lymphoma produce autoantibodies against ALK indicative of an immune response against epitopes of the chimeric fusion protein. We asked whether ALK-expression in other malignancies induces specific antibodies. Antibodies against ALK were detected in sera of one of 50 analysed ALK-expressing neuroblastoma patients, 13 of 21 ALK positive non-small cell lung carcinoma (NSCLC) patients, 13 of 22 ALK translocation-positive, but NPM-ALK-negative lymphoma patients and one of one ALK-positive rhabdomyosarcoma patient, but not in 20 healthy adults. These data suggest that boosting a pre-existent anti-ALK immune response may be more feasible for patients with ALK-positive NSCLC, lymphomas and rhabdomyosarcomas than for tumours expressing wild-type ALK.

  20. Expressing and amplifying positive emotions facilitate goal attainment in workplace interactions

    Directory of Open Access Journals (Sweden)

    Elena eWong

    2013-05-01

    Full Text Available Expressing emotions has social functions; it provides information, affects social interactions, and shapes relationships with others. Expressing positive emotions could be a strategic tool for improving goal attainment during social interactions at work. Such effects have been found in research on social contagion, impression management, and emotion work. However, expressing emotions one does not feel entails the risk of being perceived as inauthentic. This risk may well be worth taking when the emotions felt are negative, as expressing negative emotions usually has negative effects. When experiencing positive emotions, however, expressing them authentically promises benefits, and the advantage of amplifying them is not so obvious. We postulated that expressing, and amplifying, positive emotions would foster goal attainment in social interactions at work, particularly when dealing with superiors. Analyses are based on 494 interactions involving the pursuit of a goal by 113 employees. Multilevel analyses, including polynomial analyses, show that authentic display of positive emotions supported goal attainment throughout. However, amplifying felt positive emotions promoted goal attainment only in interactions with superiors, but not with colleagues. Results are discussed with regard to the importance of hierarchy for detecting, and interpreting, signs of strategic display of positive emotions.

  1. Gasdermin B expression predicts poor clinical outcome in HER2-positive breast cancer

    Science.gov (United States)

    Hergueta-Redondo, Marta; Sarrio, David; Molina-Crespo, Ángela; Vicario, Rocío; Bernadó-Morales, Cristina; Martínez, Lidia; Rojo-Sebastián, Alejandro; Serra-Musach, Jordi; Mota, Alba; Martínez-Ramírez, Ángel; Castilla, Maria Ángeles; González-Martin, Antonio; Pernas, Sonia; Cano, Amparo; Cortes, Javier; Nuciforo, Paolo G.; Peg, Vicente; Palacios, José; Pujana, Miguel Ángel; Arribas, Joaquín; Moreno-Bueno, Gema

    2016-01-01

    Around, 30–40% of HER2-positive breast cancers do not show substantial clinical benefit from the targeted therapy and, thus, the mechanisms underlying resistance remain partially unknown. Interestingly, ERBB2 is frequently co-amplified and co-expressed with neighbour genes that may play a relevant role in this cancer subtype. Here, using an in silico analysis of data from 2,096 breast tumours, we reveal a significant correlation between Gasdermin B (GSDMB) gene (located 175 kilo bases distal from ERBB2) expression and the pathological and clinical parameters of poor prognosis in HER2-positive breast cancer. Next, the analysis of three independent cohorts (totalizing 286 tumours) showed that approximately 65% of the HER2-positive cases have GSDMB gene amplification and protein over-expression. Moreover, GSDMB expression was also linked to poor therapeutic responses in terms of lower relapse free survival and pathologic complete response as well as positive lymph node status and the development of distant metastasis under neoadjuvant and adjuvant treatment settings, respectively. Importantly, GSDMB expression promotes survival to trastuzumab in different HER2-positive breast carcinoma cells, and is associated with trastuzumab resistance phenotype in vivo in Patient Derived Xenografts. In summary, our data identifies the ERBB2 co-amplified and co-expressed gene GSDMB as a critical determinant of poor prognosis and therapeutic response in HER2-positive breast cancer. PMID:27462779

  2. Broadly defined risk mental states during adolescence: disorganization mediates positive schizotypal expression.

    Science.gov (United States)

    Debbané, Martin; Badoud, Deborah; Balanzin, Dario; Eliez, Stephan

    2013-06-01

    While schizotypal features are common during adolescence, they can also signal increased risk for the onset of schizophreniform disorders. Most studies with adolescents find that hallucination and delusion-like symptoms (positive schizotypal features) best predict future psychopathology. Still, the developmental process of positive schizotypy remains elusive, specifically with regards to 1) its relationships to negative and disorganization schizotypal dimensions; 2) its associations to maladaptive functioning during adolescence. This longitudinal study aimed to further characterize these relationships, thereby delineating "early and broadly defined psychosis risk mental states" (Keshavan et al., 2011). The current study presents the 3-year course of schizotypal trait expression in 34 clinical adolescents aged 12 to 18 years consulting for non-psychotic difficulties. Schizotypal expression was assessed twice using the Schizotypal Personality Questionnaire, accompanied by an examination of internalizing/externalizing problems using the Achenbach scales. Cross-sectional and longitudinal analyses were conducted to assess the expression and course of schizotypal dimensions; mediation analyses were further employed to highlight the developmental interactions promoting the maintenance of positive schizotypal expression. The results reveal that positive schizotypy, and more specifically unusual perceptual experiences, significantly declined during the study interval. Disorganization features were found to mediate the relationships between the negative and positive dimensions of schizotypy within and across evaluations. Somatic complaints and attentional difficulties further strengthened the expression of positive schizotypy during the study interval. These results suggest that the relationship between disorganization features and positive schizotypy may play a central role in establishing risk for psychosis during adolescence.

  3. Patterns of expression of keratin 17 in human epithelia: dependency on cell position.

    Science.gov (United States)

    Troyanovsky, S M; Guelstein, V I; Tchipysheva, T A; Krutovskikh, V A; Bannikov, G A

    1989-07-01

    By immunomorphology, using keratin 17-specific monoclonal antibody, it has been shown that this keratin is expressed only in the basal cells of a group of complex epithelia: glandular epithelium with myoepithelial component, transitional and pseudostratified epithelia. Immunolocalization of keratin 17 provides evidence that the expression of this keratin strongly depends on the cell position within epithelial structures. The topographical character of the keratin expression suggests that these proteins may be implicated in the generation of spatial organization of epithelial tissues.

  4. Positive obligations concerning freedom of expression: mere potential or real power?

    NARCIS (Netherlands)

    T. McGonagle

    2015-01-01

    This chapter examines how the European Court of Human Rights has identified and developed a range of positive State obligations to secure the right to freedom of expression. It first briefly examines the theoretical and normative bases for the positive obligations doctrine and then traces its hesita

  5. Differential Language Functioning of Monolinguals and Bilinguals on Positive-Negative Emotional Expression.

    Science.gov (United States)

    Kheirzadeh, Shiela; Hajiabed, Mohammadreza

    2016-02-01

    The present interdisciplinary research investigates the differential emotional expression between Persian monolinguals and Persian-English bilinguals. In other words, the article was an attempt to answer the questions whether bilinguals and monolinguals differ in the expression of positive and negative emotions elicited through sad and happy autobiographies and measured through UWIST Mood Adjective Checklist. The result of this pioneering work indicated no significant difference between Persian monolinguals and Persian-English bilinguals in expressing happy memories while differences were observed on sad memories. Bilinguals expressed more negative emotions in their L2 than L1. This outcome support the dominant claim that second language is the preferred language for the expression of sad emotions since it is the language of emotional detachment and distance. Further analysis on the number of words bilinguals and monolinguals used to express both sad and happy autobiographies indicated that bilinguals used more words in expressing both sad and happy autobiographies.

  6. 促甲状腺激素抑制疗法对老年甲状腺癌患者血清sIL-2 R、CD44 V6、TSGF及外周血T淋巴细胞亚群影响研究%Effect of TSH inhibition on sIL-2 R, TSGF, CD44 V6 and T lymphocyte subsets in elderly patients with thyroid cancer

    Institute of Scientific and Technical Information of China (English)

    吴伟宏; 王丰平

    2015-01-01

    Objective To analyze the effect of TSH inhibition on soluble interleukin 2 receptor ( sIL-2R), interleukin 44 variant 6 (CD44V6), tumor specific growth factor (TSGF) and T lymphocyte subsets in elderly patients with thyroid cancer.Methods 50 elderly patients with thyroid cancer in our hospital were collected.The patients were randomly assigned to experimental and control groups, 25 cases in each group, patients in the experimental group were given TSH suppression therapy after surgery , patients in control group were given thyroxine replacement therapy after operation, treatment for 1 month, serum SIL-2R, CD44v6, TSGF and peripheral blood T lymphocyte subsets situation were detected in all patients with .ResuIts After treatment, compared with the control group, ①in the experimental group, the level of serum sIL-2R was significantly lower, the difference was statistically significant(P<0.05);②the serum CD44V6 level was lower in the experimental group (P<0.05);③the serum TSGF level was lower in the experimental group (P<0.05);③in the experimental group,the levels of CD3 + and CD4 +were higher, levels of CD8 + were lower ( P<0.05 ) .ConcIusions TSH suppression therapy can reduce senile thyroid cancer patients serum SIL-2R, CD44v6, TSGF and CD8 +lymphocyte level, peripheral blood T lymphocyte CD3 +, CD4 +levels were elevated,and improve the immune function of patients , the clinical has guiding significance .%目的:探讨促甲状腺激素( thyroid stimulating hormone,TSH)抑制疗法对老年甲状腺癌患者血清可溶性白细胞介素-2受体(soluble interleukin-2 receptor,sIL-2R)、白细胞分化抗原44变异型6(CD44V6)、肿瘤特异性生长因子(tumors pecific growth factor , TSGF)及外周血T淋巴细胞亚群( peripheral blood T lymphocyte subsets,PBTLS)影响。方法收集的本院收治的老年甲状腺癌患者50例,随机分为对照组和实验组,每组各25例,实验组术后给予TSH抑制

  7. Expression of DC-SIGN and DC-SIGNRs in placentas of HIV-positive patients

    Directory of Open Access Journals (Sweden)

    Komala Pillay

    2014-09-01

    Full Text Available Background. Human dendritic cell-specific intracellular adhesion molecule-3 (ICAM3-grabbing non-integrin (DC-SIGN is a mannose-binding lectin that initiates interaction between dendritic cells and resting T-lymphocytes. DC-SIGN is highly expressed in placental tissue on dendritic cells and Hofbauer cells, and it is suggested that HIV may become adsorbed to DC-SIGN on Hofbauer cells as part of the mechanism of mother-to-child HIV transmission. A possible mechanism of transfer of the virus from the Hofbauer cells to the fetus is the subsequent adsorption to DC-SIGN-related molecules (DC-SIGNRs, present on immediately adjacent capillary vascular endothelium. However, data on DC-SIGN and DC-SIGNR expression in the placenta are few.Methods. Forty term placentas from HIV-positive mothers and 21 term placentas from HIV-negative mothers underwent immunohistochemistry staining for DC-SIGN and DC-SIGNR expression. Five random sets of 10 villi were assessed, and the average number of positive cells were counted in each case. In addition, where possible, maternal and cord blood viral loads and maternal CD4+ counts were performed in the HIV-positive group only.Results. The median maternal CD4+ count was 377 cells/µl and 27% of participants had undetectable viral loads; the median detectable viral load was 3.72 log. Most (97% of the cord bloods tested in infants from HIV-positive mothers had lower than detectable viral loads. HIV-positive cases had significantly greater expression of both DC-SIGNRs (median values in HIV-positive cases, 14.5 positive cells/10 villi (pc/10villi, compared with 11 pc/10villi in HIV-negative cases, p=0.020 and DC-SIGN (median value in HIV-positive cases, 26.5 pc/10villi, compared with 23 pc/10villi in HIV-negative cases, p=0.037. DC-SIGNR expression was also noted in Hofbauer cells and decidual macrophages in addition to endothelium (reported currently. There was no difference in expression of DC-SIGN and DC-SIGNRs in patients

  8. Exploring the Rationales Expressed for Including a CSR Position to the Top Management Team

    DEFF Research Database (Denmark)

    Strand, Robert

    Recently, a number of positions with corporate social responsibility (CSR) in the position title have been introduced to the top management teams (TMTs) of some of the world’s largest corporations. I explore this phenomenon. I revisit 10 such positions identified in a previous study to add...... a longitudinal aspect. I then focus on three case companies from within this selection- H&M, Mattel, and Storebrand- whereby I employ the Weberian distinction between formal and substantive rationality to identify the rationales expressed by members of these TMTs for including a CSR position to the TMT...

  9. Aging and emotional expressions: is there a positivity bias during dynamic emotion recognition?

    Directory of Open Access Journals (Sweden)

    Alberto eDi Domenico

    2015-08-01

    Full Text Available In this study, we investigated whether age-related differences in emotion regulation priorities influence online dynamic emotional facial discrimination. A group of 40 younger and a group of 40 older adults were invited to recognize a positive or negative expression as soon as the expression slowly emerged and subsequently rate it in terms of intensity. Our findings show that older adults recognized happy expressions faster than angry ones, while the direction of emotional expression does not seem to affect younger adults’ performance. Furthermore, older adults rated both negative and positive emotional faces as more intense compared to younger controls. This study detects age-related differences with a dynamic online paradigm and suggests that different regulation strategies may shape emotional face recognition.

  10. A closed-form expression of the positional uncertainty for 3D point clouds.

    Science.gov (United States)

    Bae, Kwang-Ho; Belton, David; Lichti, Derek D

    2009-04-01

    We present a novel closed-form expression of positional uncertainty measured by a near-monostatic and time-of-flight laser range finder with consideration of its measurement uncertainties. An explicit form of the angular variance of the estimated surface normal vector is also derived. This expression is useful for the precise estimation of the surface normal vector and the outlier detection for finding correspondence in order to register multiple three-dimensional point clouds. Two practical algorithms using these expressions are presented: a method for finding optimal local neighbourhood size which minimizes the variance of the estimated normal vector and a resampling method of point clouds.

  11. Long-distance signals positively regulate the expression of iron uptake genes in tobacco roots.

    Science.gov (United States)

    Enomoto, Yusuke; Hodoshima, Hirotaka; Shimada, Hiroaki; Shoji, Kazuhiro; Yoshihara, Toshihiro; Goto, Fumiyuki

    2007-12-01

    Long-distance signals generated in shoots are thought to be associated with the regulation of iron uptake from roots; however, the signaling mechanism is still unknown. To elucidate whether the signal regulates iron uptake genes in roots positively or negatively, we analyzed the expressions of two representative iron uptake genes: NtIRT1 and NtFRO1 in tobacco (Nicotiana tabacum L.) roots, after shoots were manipulated in vitro. When iron-deficient leaves were treated with Fe(II)-EDTA, the expressions of both genes were significantly reduced; nevertheless iron concentration in the roots maintained a similar level to that in roots grown under iron-deficient conditions. Next, all leaves from tobacco plants grown under the iron-deficient condition were excised. The expression of two genes were quickly reduced below half within 2 h after the leaf excision and gradually disappeared by the end of a 24-h period. The NtIRT1 expression was compared among the plants whose leaves were cut off in various patterns. The expression increased in proportion to the dry weight of iron-deficient leaves, although no relation was observed between the gene expression and the position of excised leaves. Interestingly, the NtIRT1 expression in hairy roots increased under the iron-deficient condition, suggesting that roots also have the signaling mechanism of iron status as well as shoots. Taken together, these results indicate that the long-distance signal generated in iron-deficient tissues including roots is a major factor in positive regulation of the expression of NtIRT1 and NtFRO1 in roots, and that the strength of the signal depends on the size of plants.

  12. Expression systems for industrial Gram-positive bacteria with low guanine and cytosine content

    NARCIS (Netherlands)

    Vos, Willem M. de; Kleerebezem, Michiel; Kuipers, Oscar P.

    1997-01-01

    Recent years have seen an increase in the development of gene expression systems for industrial Gram-positive bacteria with low guanine and cytosine content that belong to the genera Bacillus, Clostridium, Lactococcus, Lactobacillus, Staphylococcus and Streptococcus. In particular, considerable adva

  13. Happy babies, chatty toddlers: infant positive affect facilitates early expressive, but not receptive language.

    Science.gov (United States)

    Laake, Lauren M; Bridgett, David J

    2014-02-01

    Eighty-three mother-infant dyads participated in this study. Positive affect (PA) broadly, along with fine-grained aspects of PA, was measured at 10 months of age. Language was measured at 14 months. Infant PA predicted expressive, but not receptive, language. The implications of these findings are discussed.

  14. Expression of T-Lymphocyte Markers in Human Epidermal Growth Factor Receptor 2-Positive Breast Cancer

    Science.gov (United States)

    Lee, Changro; Kim, Joo Heung; Lim, Sung Mook; Park, Hyung Seok; Kim, Seung Il; Park, Byeong-Woo

    2016-01-01

    Purpose The present study aimed to examine the clinical implications of CD4, CD8, and FOXP3 expression on the prognosis of human epidermal growth factor receptor 2 (HER2)-positive breast cancer using a web-based database, and to compare the immunohistochemical expression of T-lymphocyte markers using primary and metastatic HER2-positive tumor tissues before and after HER2-targeted therapy. Methods Using the cBioPortal for Cancer Genomics and Kaplan-Meier plotter, the mRNA expression, association between T-lymphocyte markers, and survival in HER2-positive cancers were investigated according to various cutoff levels. Immunohistochemistry analysis was performed using paired primary and metastatic tissues of 29 HER2-positive tumors treated with systemic chemotherapy and HER2-directed therapy. Results HER2 mRNA was mutually exclusive of T-lymphocyte markers, and a significant correlation between T-cell markers was observed in the cBioPortal for Cancer Genomics. According to analysis of the Kaplan-Meier plotter, the impact of T-lymphocyte marker expression on survival was statistically insignificant in clinical HER2-positive tumors, irrespective of the cutoff levels. However, in the intrinsic HER2-positive subtype, the individual analyses of T-cell markers except for FOXP3 and combined analysis showed significantly favorable survival irrespective of cutoff points. Although the small clinical sample size made it difficult to show the statistical relevance of immunohistochemistry findings, good responses to neoadjuvant treatments might be associated with positive expression of combined T-lymphocyte markers, and approximately half of the samples showed discordance of combined markers between baseline and resistant tumors. Conclusion T-lymphocyte markers could be favorable prognostic factors in HER2-positive breast cancers; however, a consensus on patient section criteria, detection methods, and cutoff value could not be reached. The resistance to HER2-directed therapy might

  15. Aromatase expression increases the survival and malignancy of estrogen receptor positive breast cancer cells.

    Directory of Open Access Journals (Sweden)

    Keya De Mukhopadhyay

    Full Text Available In postmenopausal women, local estrogen produced by adipose stromal cells in the breast is believed to support estrogen receptor alpha (ERα positive breast cancer cell survival and growth. This raises the question of how the ERα positive metastatic breast cancer cells survive after they enter blood and lymph circulation, where estrogen level is very low in postmenopausal women. In this study, we show that the aromatase expression increased when ERα positive breast cancer cells were cultured in suspension. Furthermore, treatment with the aromatase substrate, testosterone, inhibited suspension culture-induced apoptosis whereas an aromatase inhibitor attenuated the effect of testosterone suggesting that suspended circulating ERα positive breast cancer cells may up-regulate intracrine estrogen activity for survival. Consistent with this notion, a moderate level of ectopic aromatase expression rendered a non-tumorigenic ERα positive breast cancer cell line not only tumorigenic but also metastatic in female nude mice without exogenous estrogen supplementation. The increased malignant phenotype was confirmed to be due to aromatase expression as the growth of orthotopic tumors regressed with systemic administration of an aromatase inhibitor. Thus, our study provides experimental evidence that aromatase plays an important role in the survival of metastatic ERα breast cancer cells by suppressing anoikis.

  16. Altered Chromosomal Positioning, Compaction, and Gene Expression with a Lamin A/C Gene Mutation

    Science.gov (United States)

    Abuisneineh, Fida; Fahrenbach, John P.; Zhang, Yuan; MacLeod, Heather; Dellefave, Lisa; Pytel, Peter; Selig, Sara; Labno, Christine M.; Reddy, Karen; Singh, Harinder; McNally, Elizabeth

    2010-01-01

    Background Lamins A and C, encoded by the LMNA gene, are filamentous proteins that form the core scaffold of the nuclear lamina. Dominant LMNA gene mutations cause multiple human diseases including cardiac and skeletal myopathies. The nuclear lamina is thought to regulate gene expression by its direct interaction with chromatin. LMNA gene mutations may mediate disease by disrupting normal gene expression. Methods/Findings To investigate the hypothesis that mutant lamin A/C changes the lamina's ability to interact with chromatin, we studied gene misexpression resulting from the cardiomyopathic LMNA E161K mutation and correlated this with changes in chromosome positioning. We identified clusters of misexpressed genes and examined the nuclear positioning of two such genomic clusters, each harboring genes relevant to striated muscle disease including LMO7 and MBNL2. Both gene clusters were found to be more centrally positioned in LMNA-mutant nuclei. Additionally, these loci were less compacted. In LMNA mutant heart and fibroblasts, we found that chromosome 13 had a disproportionately high fraction of misexpressed genes. Using three-dimensional fluorescence in situ hybridization we found that the entire territory of chromosome 13 was displaced towards the center of the nucleus in LMNA mutant fibroblasts. Additional cardiomyopathic LMNA gene mutations were also shown to have abnormal positioning of chromosome 13, although in the opposite direction. Conclusions These data support a model in which LMNA mutations perturb the intranuclear positioning and compaction of chromosomal domains and provide a mechanism by which gene expression may be altered. PMID:21179469

  17. Altered chromosomal positioning, compaction, and gene expression with a lamin A/C gene mutation.

    Directory of Open Access Journals (Sweden)

    Stephanie K Mewborn

    Full Text Available BACKGROUND: Lamins A and C, encoded by the LMNA gene, are filamentous proteins that form the core scaffold of the nuclear lamina. Dominant LMNA gene mutations cause multiple human diseases including cardiac and skeletal myopathies. The nuclear lamina is thought to regulate gene expression by its direct interaction with chromatin. LMNA gene mutations may mediate disease by disrupting normal gene expression. METHODS/FINDINGS: To investigate the hypothesis that mutant lamin A/C changes the lamina's ability to interact with chromatin, we studied gene misexpression resulting from the cardiomyopathic LMNA E161K mutation and correlated this with changes in chromosome positioning. We identified clusters of misexpressed genes and examined the nuclear positioning of two such genomic clusters, each harboring genes relevant to striated muscle disease including LMO7 and MBNL2. Both gene clusters were found to be more centrally positioned in LMNA-mutant nuclei. Additionally, these loci were less compacted. In LMNA mutant heart and fibroblasts, we found that chromosome 13 had a disproportionately high fraction of misexpressed genes. Using three-dimensional fluorescence in situ hybridization we found that the entire territory of chromosome 13 was displaced towards the center of the nucleus in LMNA mutant fibroblasts. Additional cardiomyopathic LMNA gene mutations were also shown to have abnormal positioning of chromosome 13, although in the opposite direction. CONCLUSIONS: These data support a model in which LMNA mutations perturb the intranuclear positioning and compaction of chromosomal domains and provide a mechanism by which gene expression may be altered.

  18. Expression of POEM, a positive regulator of osteoblast differentiation, is suppressed by TNF-{alpha}

    Energy Technology Data Exchange (ETDEWEB)

    Tsukasaki, Masayuki [Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa, Tokyo 142-8555 (Japan); Yamada, Atsushi, E-mail: yamadaa@dent.showa-u.ac.jp [Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa, Tokyo 142-8555 (Japan); Suzuki, Dai [Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa, Tokyo 142-8555 (Japan); Aizawa, Ryo [Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa, Tokyo 142-8555 (Japan); Department of Periodontology, School of Dentistry, Showa University, 2-1-1 Kitasenzoku, Ohta, Tokyo 145-8515 (Japan); Miyazono, Agasa [Department of Periodontology, School of Dentistry, Showa University, 2-1-1 Kitasenzoku, Ohta, Tokyo 145-8515 (Japan); Miyamoto, Yoichi; Suzawa, Tetsuo; Takami, Masamichi; Yoshimura, Kentaro [Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa, Tokyo 142-8555 (Japan); Morimura, Naoko [Laboratory for Comparative Neurogenesis, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198 (Japan); Yamamoto, Matsuo [Department of Periodontology, School of Dentistry, Showa University, 2-1-1 Kitasenzoku, Ohta, Tokyo 145-8515 (Japan); Kamijo, Ryutaro [Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa, Tokyo 142-8555 (Japan)

    2011-07-15

    Highlights: {yields} TNF-{alpha} inhibits POEM gene expression. {yields} Inhibition of POEM gene expression is caused by NF-{kappa}B activation by TNF-{alpha}. {yields} Over-expression of POEM recovers inhibition of osteoblast differentiation by TNF-{alpha}. -- Abstract: POEM, also known as nephronectin, is an extracellular matrix protein considered to be a positive regulator of osteoblast differentiation. In the present study, we found that tumor necrosis factor-{alpha} (TNF-{alpha}), a key regulator of bone matrix properties and composition that also inhibits terminal osteoblast differentiation, strongly inhibited POEM expression in the mouse osteoblastic cell line MC3T3-E1. TNF-{alpha}-induced down-regulation of POEM gene expression occurred in both time- and dose-dependent manners through the nuclear factor kappa B (NF-{kappa}B) pathway. In addition, expressions of marker genes in differentiated osteoblasts were down-regulated by TNF-{alpha} in a manner consistent with our findings for POEM, while over-expression of POEM recovered TNF-{alpha}-induced inhibition of osteoblast differentiation. These results suggest that TNF-{alpha} inhibits POEM expression through the NF-{kappa}B signaling pathway and down-regulation of POEM influences the inhibition of osteoblast differentiation by TNF-{alpha}.

  19. Determinants of nucleosome positioning and their influence on plant gene expression.

    Science.gov (United States)

    Liu, Ming-Jung; Seddon, Alexander E; Tsai, Zing Tsung-Yeh; Major, Ian T; Floer, Monique; Howe, Gregg A; Shiu, Shin-Han

    2015-08-01

    Nucleosome positioning influences the access of transcription factors (TFs) to their binding sites and gene expression. Studies in plant, animal, and fungal models demonstrate similar nucleosome positioning patterns along genes and correlations between occupancy and expression. However, the relationships among nucleosome positioning, cis-regulatory element accessibility, and gene expression in plants remain undefined. Here we showed that plant nucleosome depletion occurs on specific 6-mer motifs and this sequence-specific nucleosome depletion is predictive of expression levels. Nucleosome-depleted regions in Arabidopsis thaliana tend to have higher G/C content, unlike yeast, and are centered on specific G/C-rich 6-mers, suggesting that intrinsic sequence properties, such as G/C content, cannot fully explain plant nucleosome positioning. These 6-mer motif sites showed higher DNase I hypersensitivity and are flanked by strongly phased nucleosomes, consistent with known TF binding sites. Intriguingly, this 6-mer-specific nucleosome depletion pattern occurs not only in promoter but also in genic regions and is significantly correlated with higher gene expression level, a phenomenon also found in rice but not in yeast. Among the 6-mer motifs enriched in genes responsive to treatment with the defense hormone jasmonate, there are no significant changes in nucleosome occupancy, suggesting that these sites are potentially preconditioned to enable rapid response without changing chromatin state significantly. Our study provides a global assessment of the joint contribution of nucleosome occupancy and motif sequences that are likely cis-elements to the control of gene expression in plants. Our findings pave the way for further understanding the impact of chromatin state on plant transcriptional regulatory circuits.

  20. Expression Analysis of Cellular Mir-29a and mir-29b in HIV Positive Patients

    Directory of Open Access Journals (Sweden)

    Hasan Kaleji (MSc

    2016-01-01

    Full Text Available Background and Objective: Various cellular factors affect the process of HIV activity. One of these cellular factors are structures known as microRN that are expected to be involved in controlling HIV replication and infectivity. The expression of one or a set of them may represent the patient's clinical conditions. In this study, the expression of miR-29a and miR-29b involved in regulating viral genes’ expression was evaluated in three HIV-positive groups and a healthy control group. Later, the expression level of these microRNAs was compared between the cases and controls. Methods: Total RNA extraction was performed on the collected samples using RNx-plus kit and then the microRNA expression levels were evaluated using Relative Real-time PCR. The obtained data was entered into SPSS 22 and Graphpad softwares and analyzed using Kruskal-Wallis and Man-Whitney tests. P-value of less than 0.05 was considered as statistical significance level. Results: The expression level of miR-29a was reduced in patients under treatment and drug-resistant patients ( P ≤ 0.05 . All three HIV-positive groups including people without drug treatment, patients under treatment and drug-resistant patients showed reduced miR-29b expression level compared to control group (P ≤ 0.05. Conclusion: the decreased expression of miR-29a and miR-29b in patients under treatment and drug-resistant patients indicates an increased viral replication and reduced CD4 cell count. It may be possible to predict the progression of the disease by miRNA measurement or control viral replication using these mir-RNAs that requires further studies.

  1. Conservation of position-specific gene expression in axolotl limb skin.

    Science.gov (United States)

    Satoh, Akira; Makanae, Aki

    2014-01-01

    Urodele amphibians can regenerate their limbs after amputation. After amputation, undifferentiated cells appear on the amputation plane and form regeneration blastema. A limb blastema recreates a complete replica of the original limb. It is well known that disturbance of the location of limb tissues prior to amputation perturbs limb patterning, suggesting that different intact limb tissues carry different location information despite their identical appearance. The cause of such differences in intact tissues remains unknown. In this study, we found that Lmx1b, Tbx2, and Tbx3 genes, which are expressed in developing limb in a region specific manner, remained detectable in a mature axolotl limb. Furthermore, those position-specific gene expression patterns were conserved in mature limbs. Treatment with retinoic acid (RA), which is known to have ventralizing activity, changed Lmx1b expression in intact dorsal skin and dorsal character to ventral, indicating that conserved Lmx1b expression was due to the dorsal character and not leaky gene expression. Furthermore, we found that such conserved gene expression was rewritable in regeneration blastemas. These results suggest that axolotl limb cells can recognize their locations and maintain limbness via conserved expression profiles of developmental genes.

  2. Evolutionary tuning of protein expression levels of a positively autoregulated two-component system.

    Directory of Open Access Journals (Sweden)

    Rong Gao

    2013-10-01

    Full Text Available Cellular adaptation relies on the development of proper regulatory schemes for accurate control of gene expression levels in response to environmental cues. Over- or under-expression can lead to diminished cell fitness due to increased costs or insufficient benefits. Positive autoregulation is a common regulatory scheme that controls protein expression levels and gives rise to essential features in diverse signaling systems, yet its roles in cell fitness are less understood. It remains largely unknown how much protein expression is 'appropriate' for optimal cell fitness under specific extracellular conditions and how the dynamic environment shapes the regulatory scheme to reach appropriate expression levels. Here, we investigate the correlation of cell fitness and output response with protein expression levels of the E. coli PhoB/PhoR two-component system (TCS. In response to phosphate (Pi-depletion, the PhoB/PhoR system activates genes involved in phosphorus assimilation as well as genes encoding themselves, similarly to many other positively autoregulated TCSs. We developed a bacteria competition assay in continuous cultures and discovered that different Pi conditions have conflicting requirements of protein expression levels for optimal cell fitness. Pi-replete conditions favored cells with low levels of PhoB/PhoR while Pi-deplete conditions selected for cells with high levels of PhoB/PhoR. These two levels matched PhoB/PhoR concentrations achieved via positive autoregulation in wild-type cells under Pi-replete and -deplete conditions, respectively. The fitness optimum correlates with the wild-type expression level, above which the phosphorylation output saturates, thus further increase in expression presumably provides no additional benefits. Laboratory evolution experiments further indicate that cells with non-ideal protein levels can evolve toward the optimal levels with diverse mutational strategies. Our results suggest that the natural

  3. Differential Activation of Amygdala Arc Expression By Positive and Negatively Valenced Emotional Learning Conditions

    Directory of Open Access Journals (Sweden)

    Erica eYoung

    2013-12-01

    Full Text Available Norepinephrine is released in the amygdala following negatively arousing learning conditions. This event initiates a cascade of changes including the transcription of activity-regulated cytoskeleton-associated protein (Arc expression, an early-immediate gene associated with memory encoding. Recent evidence suggests that the valence of emotionally laden encounters may generate lateralized, as opposed to symmetric release of this transmitter in the right or left amygdala. It is currently not clear if valence-induced patterns of selective norepinephrine output across hemispheres are also reproduced in downstream pathways of cellular signaling necessary for memory formation. This question was addressed by determining if Arc expression is differentially distributed across the right and left amygdala following exposure to positively or negatively valenced learning conditions respectively. Male Sprague Dawley rats were randomly assigned to groups exposed to the Homecage only, 5 auditory tones only, or 5 auditory tones paired with footshock (0.35mA during Pavlovian fear conditioning. Western blot analysis revealed that Arc expression in the right amygdala was elevated significantly above that observed in the left amygdala 60 and 90 minutes following fear conditioning. Similarly, subjects exposed to a a negatively valenced outcome consisting of an unexpected reduction in food rewards showed a greater level of Arc expression in only the right, but not left basolateral amygdala. Presenting a positively valenced event involving an unexpected increase in food reward magnitude following bar pressing, resulted in significantly greater Arc expression in the left, but not right basolateral amygdala (p

  4. Detecting positive darwinian selection in brain-expressed genes during human evolution

    Institute of Scientific and Technical Information of China (English)

    QI XueBin; Alice A. LIN; Luca L. CAVALLI-SFORZA; WANG Jun; SU Bing; YANG Su; ZHENG HongKun; WANG YinQiu; LIAO ChengHong; LIU Ying; CHEN XiaoHua; SHI Hong; YU XiaoJing

    2007-01-01

    To understand the genetic basis that underlies the phenotypic divergence between human and nonhuman primates, we screened a total of 7176 protein-coding genes expressed in the human brain and compared them with the chimpanzee orthologs to identify genes that show evidence of rapid evolution in the human lineage. Our results showed that the nonsynonymous/synonymous substitution (Ka/Ks) ratio for genes expressed in the brain of human and chimpanzee is 0.3854, suggesting that the brain-expressed genes are under functional constraint. The X-linked human brain-expressed genes evolved more rapidly than autosomal ones. We further dissected the molecular evolutionary patterns of 34 candidate genes by sequencing representative primate species to identify lineage-specific adaptive evolution. Fifteen out of the 34 candidate genes showed evidence of positive Darwinian selection in human and/or chimpanzee lineages. These genes are predicted to play diverse functional roles in embryonic development, spermatogenesis and male fertility, signal transduction, sensory nociception, and neural function. This study together with others demonstrated the usefulness and power of phylogenetic comparison of multiple closely related species in detecting lineage-specific adaptive evolution, and the identification of the positively selected brain-expressed genes may add new knowledge to the understanding of molecular mechanism of human origin.

  5. Interaction with the Yes-associated protein (YAP) allows TEAD1 to positively regulate NAIP expression.

    Science.gov (United States)

    Landin Malt, André; Georges, Adrien; Silber, Joël; Zider, Alain; Flagiello, Domenico

    2013-10-01

    Although the expression of the neuronal apoptosis inhibitory protein (NAIP) gene is considered involved in apoptosis suppression as well as in inflammatory response, the molecular basis of the NAIP gene expression is poorly understood. Here we show that the TEA domain protein 1 (TEAD1) is able to positively activate the transcription of NAIP. We further demonstrate that this regulation is mediated by the presence of the endogenous Yes associated protein (YAP) cofactor, and requires the interaction with YAP. We finally identified an intronic region of the NAIP gene responding to TEAD1/YAP activity, suggesting that regulation of NAIP by TEAD1/YAP is at the transcriptional level.

  6. Positive regulation of botulinum neurotoxin gene expression by CodY in Clostridium botulinum ATCC 3502.

    Science.gov (United States)

    Zhang, Zhen; Dahlsten, Elias; Korkeala, Hannu; Lindström, Miia

    2014-12-01

    Botulinum neurotoxin, produced mainly by the spore-forming bacterium Clostridium botulinum, is the most poisonous biological substance known. Here, we show that CodY, a global regulator conserved in low-G+C Gram-positive bacteria, positively regulates the botulinum neurotoxin gene expression. Inactivation of codY resulted in decreased expression of botA, encoding the neurotoxin, as well as in reduced neurotoxin synthesis. Complementation of the codY mutation in trans rescued neurotoxin synthesis, and overexpression of codY in trans caused elevated neurotoxin production. Recombinant CodY was found to bind to a 30-bp region containing the botA transcription start site, suggesting regulation of the neurotoxin gene transcription through direct interaction. GTP enhanced the binding affinity of CodY to the botA promoter, suggesting that CodY-dependent neurotoxin regulation is associated with nutritional status.

  7. Negative and positive auto-regulation of BMP expression in early eye development.

    Science.gov (United States)

    Huang, Jie; Liu, Ying; Filas, Benjamen; Gunhaga, Lena; Beebe, David C

    2015-11-15

    Previous results have shown that Bone Morphogenetic Protein (BMP) signaling is essential for lens specification and differentiation. How BMP signals are regulated in the prospective lens ectoderm is not well defined. To address this issue we have modulated BMP activity in a chicken embryo pre-lens ectoderm explant assay, and also studied transgenic mice, in which the type I BMP receptors, Bmpr1a and Acvr1, are deleted from the prospective lens ectoderm. Our results show that chicken embryo pre-lens ectoderm cells express BMPs and require BMP signaling for lens specification in vitro, and that in vivo inhibition of BMP signals in the mouse prospective lens ectoderm interrupts lens placode formation and prevents lens invagination. Furthermore, our results provide evidence that BMP expression is negatively auto-regulated in the lens-forming ectoderm, decreasing when the tissue is exposed to exogenous BMPs and increasing when BMP signaling is prevented. In addition, eyes lacking BMP receptors in the prospective lens placode develop coloboma in the adjacent wild type optic cup. In these eyes, Bmp7 expression increases in the ventral optic cup and the normal dorsal-ventral gradient of BMP signaling in the optic cup is disrupted. Pax2 becomes undetectable and expression of Sfrp2 increases in the ventral optic cup, suggesting that increased BMP signaling alter their expression, resulting in failure to close the optic fissure. In summary, our results suggest that negative and positive auto-regulation of BMP expression is important to regulate early eye development.

  8. Quantitative Characterization of E-selectin Interaction with Native CD44 and P-selectin Glycoprotein Ligand-1 (PSGL-1) Using a Real Time Immunoprecipitation-based Binding Assay

    KAUST Repository

    Abu Samra, Dina Bashir Kamil

    2015-06-29

    Selectins (E-, P-, and L-selectins) interact with glycoprotein ligands to mediate the essential tethering/rolling step in cell transport and delivery that captures migrating cells from the circulating flow. In this work, we developed a real time immunoprecipitation assay on a surface plasmon resonance chip that captures native glycoforms of two well known E-selectin ligands (CD44/hematopoietic cell E-/L-selectin ligand and P-selectin glycoprotein ligand-1) from hematopoietic cell extracts. Here we present a comprehensive characterization of their binding to E-selectin. We show that both ligands bind recombinant monomeric E-selectin transiently with fast on- and fast off-rates, whereas they bind dimeric E-selectin with remarkably slow onand off-rates. This binding requires the sialyl Lewis x sugar moiety to be placed on both O- and N-glycans, and its association, but not dissociation, is sensitive to the salt concentration. Our results suggest a mechanism through which monomeric selectins mediate initial fast on and fast off kinetics to help capture cells out of the circulating shear flow; subsequently, tight binding by dimeric/oligomeric selectins is enabled to significantly slow rolling. © 2015 by The American Society for Biochemistry and Molecular Biology, Inc.

  9. Oxytocin enhances attentional bias for neutral and positive expression faces in individuals with higher autistic traits.

    Science.gov (United States)

    Xu, Lei; Ma, Xiaole; Zhao, Weihua; Luo, Lizhu; Yao, Shuxia; Kendrick, Keith M

    2015-12-01

    There is considerable interest in the potential therapeutic role of the neuropeptide oxytocin in altering attentional bias towards emotional social stimuli in psychiatric disorders. However, it is still unclear whether oxytocin primarily influences attention towards positive or negative valence social stimuli. Here in a double-blind, placebo controlled, between subject design experiment in 60 healthy male subjects we have used the highly sensitive dual-target rapid serial visual presentation (RSVP) paradigm to investigate whether intranasal oxytocin (40IU) treatment alters attentional bias for emotional faces. Results show that oxytocin improved recognition accuracy of neutral and happy expression faces presented in the second target position (T2) during the period of reduced attentional capacity following prior presentation of a first neutral face target (T1), but had no effect on recognition of negative expression faces (angry, fearful, sad). Oxytocin also had no effect on recognition of non-social stimuli (digits) in this task. Recognition accuracy for neutral faces at T2 was negatively associated with autism spectrum quotient (ASQ) scores in the placebo group, and oxytocin's facilitatory effects were restricted to a sub-group of subjects with higher ASQ scores. Our results therefore indicate that oxytocin primarily enhances the allocation of attentional resources towards faces expressing neutral or positive emotion and does not influence that towards negative emotion ones or non-social stimuli. This effect of oxytocin is strongest in healthy individuals with higher autistic trait scores, thereby providing further support for its potential therapeutic use in autism spectrum disorder.

  10. Positive nuclear expression of KLF8 might be correlated with shorter survival in gastric adenocarcinoma.

    Science.gov (United States)

    Hsu, Li-Sung; Wu, Pei-Ru; Yeh, Ken-Tu; Yeh, Chung-Min; Shen, Ko-Hung; Chen, Chih-Jun; Soon, Maw-Soan

    2014-04-01

    Krűppel-like factor 8 (KLF8) is important in cell proliferation, epithelial-to-mesenchymal transition, cell migration, and invasion. Gastric adenocarcinoma is among the leading causes of cancer-related death in the world. In this study, the clinicopathologic correlation of KLF8 expression with gastric adenocarcinoma in Taiwan was investigated. The nuclear localization of KLF8 was correlated with advanced stage (P = .008) and 3-year survival rate (P = .043). The nuclear expression of KLF8 was significantly higher in the diffused type of gastric adenocarcinoma compared with the intestinal type (P = .036). Kaplan-Meier analysis results showed that patients with positive nuclear KLF8 had significantly lower overall survival rate compared with those with negative nuclear KLF8 (P = .011). Univariate analysis results indicated that positive nuclear KLF8 expression, advanced stage, and lymph node metastasis are correlated with lower overall survival. Positive nuclear KLF8 might be correlated with lower survival in gastric adenocarcinoma patients and might be an oncogene property in gastric adenocarcinoma carcinogenesis.

  11. The effect of scaffold composition on the early structural characteristics of chondrocytes and expression of adhesion molecules.

    Science.gov (United States)

    Schagemann, Jan C; Kurz, Haymo; Casper, Michelle E; Stone, James S; Dadsetan, Mahrokh; Yu-Long, Sun; Mrosek, Eike H; Fitzsimmons, James S; O'Driscoll, Shawn W; Reinholz, Gregory G

    2010-04-01

    Previously we demonstrated that chondrocyte ECM synthesis and mitotic activity was dependent on scaffold composition when cultured on uncoated PCL scaffolds (pPCL) or PCL composites containing hyaluronan (PCL/HA), chitosan (PCL/CS), fibrin (PCL/F), or collagen type I (PCL/COL1). We hypothesized that initial cell contact with these biomaterials results in ultrastructural changes and alters CD44 and integrin beta1 expression. The current study was designed to investigate the early ultrastructural responses of chondrocytes on these scaffolds and expression of CD44 and integrin beta1. A common observation 1 h after seeding was the abundance of cell processes. Different types of cell processes occurred in different areas of the same cell and on different cells within the same composite. Chondrocytes seeded onto PCL/CS had the greatest cell surface enhancement. PCL/HA promoted CD44 expression and almost spherical cells with a low degree of surface enhancement. PCL/COL1 enabled continuing expression of integrin beta1 and CD44. In contrast, cells in PCL/CS, PCL/F and pPCL promoted elliptic cells with a higher degree of surface enhancement and no prolonged CD44 and integrin beta1 expression. A strong variability of cell surface processes indicated either reparative or degenerative adaptation to the artificial environment. Interestingly, we found initial integrin beta1 expression in all composite scaffolds, but not in pPCL although this promoted strong adhesiveness as indicated by the formation of stress fibers. In conclusion, chondrocytes respond to biomaterials early after implantation by altering ultrastructural characteristics and expression of CD44 and integrin beta1.

  12. Induction of CD69 expression by cagPAI-positive Helicobacter pylori infection

    Institute of Scientific and Technical Information of China (English)

    Naoki Mori; Chie Ishikawa; Masachika Senba

    2011-01-01

    AIM: To investigate and elucidate the molecular mech-anism that regulates inducible expression of CD69 by Helicobacter pylori (H. pylori ) infection.METHODS: The expression levels of CD69 in a T-cell line, Jurkat, primary human peripheral blood mononu-clear cells (PBMCs), and CD4+T cells, were assessed by immunohistochemistry, reverse transcription polymerase chain reaction, and flow cytometry. Activation of CD69 promoter was detected by reporter gene. Nuclear factor (NF)-κB activation in Jurkat cells infected with H. pylori was evaluated by electrophoretic mobility shift assay. The role of NF-κB signaling in H. pylori -induced CD69 expression was analyzed using inhibitors of NF-κB and dominant-negative mutants. The isogenic mutants with disrupted cag pathogenicity island ( cagPAI) and virD4 were used to elucidate the role of cagPAI-encoding type Ⅳ secretion system and CagA in CD69 expression.RESULTS: CD69 staining was detected in mucosal lymphocytes and macrophages in specimens of pa-tients with H. pylori -positive gastritis. Although cagPAI-positive H. pylori and an isogenic mutant of virD4 induced CD69 expression, an isogenic mutant of cag-PAI failed to induce this in Jurkat cells. H. pylori also induced CD69 expression in PBMCs and CD4+T cells. The activation of the CD69 promoter by H. pylori was mediated through NF-κB. Transfection of dominant-negative mutants of IκBs, IκB kinases, and NF-κB-inducing kinase inhibited H. pylori -induced CD69 activation. Inhibitors of NF-κB suppressed H. pylori -induced CD69 mRNA expression.CONCLUSION: The results suggest that H. pylori in-duces CD69 expression through the activation of NF-κB. cagPAI might be relevant in the induction of CD69 expression in T cells. CD69 in T cells may play a role in H. pylori -induced gastritis.

  13. Regulation of cellular adhesion molecule expression in murine oocytes,peri-implantation and post-implantation embryos

    Institute of Scientific and Technical Information of China (English)

    DAVID; P; LU; LINA; TIAN; CHRIS; O'; NEILL; NICHOLAS; JC; KING

    2002-01-01

    Expression of the adhesion molecules, ICAM-1, VCAM-1, NCAM, CD44, CD49d (VLA-4, α chain),and CD11a (LFA-1, α chain) on mouse oocytes, and pre- and peri-implantation stage embryos was exam-ined by quantitative indirect immunofluorescence microscopy. ICAM-1 was most strongly expressed at theoocyte stage, gradually declining almost to undetectable levels by the expanded blastocyst stage. NCAM,also expressed maximally on the oocyte, declined to undetectable levels beyond the morula stage. On theother hand, CD44 declined from highest expression at the oocyte stage to show a second maximum at thecompacted 8-cell/morula. This molecule exhibited high expression around contact areas between trophecto-derm and zona pellucida during blastocyst hatching. CD49d was highly expressed in the oocyte, remainedsignificantly expressed throughout and after blastocyst hatching was expressed on the polar trophecto-derm. Like CD44, CD49d declined to undetectable levels at the blastocyst outgrowth stage. Expression ofboth VCAM-1 and CD11a was undetectable throughout. The diametrical temporal expression pattern ofICAM-1 and NCAM compared to CD44 and CD49d suggest that dynamic changes in expression of adhesionmolecules may be important for interaction of the embryo with the maternal cellular environment as wellas for continuing development and survival of the early embryo.

  14. Expression of POEM, a positive regulator of osteoblast differentiation, is suppressed by TNF-α.

    Science.gov (United States)

    Tsukasaki, Masayuki; Yamada, Atsushi; Suzuki, Dai; Aizawa, Ryo; Miyazono, Agasa; Miyamoto, Yoichi; Suzawa, Tetsuo; Takami, Masamichi; Yoshimura, Kentaro; Morimura, Naoko; Yamamoto, Matsuo; Kamijo, Ryutaro

    2011-07-15

    POEM, also known as nephronectin, is an extracellular matrix protein considered to be a positive regulator of osteoblast differentiation. In the present study, we found that tumor necrosis factor-α (TNF-α), a key regulator of bone matrix properties and composition that also inhibits terminal osteoblast differentiation, strongly inhibited POEM expression in the mouse osteoblastic cell line MC3T3-E1. TNF-α-induced down-regulation of POEM gene expression occurred in both time- and dose-dependent manners through the nuclear factor kappa B (NF-κB) pathway. In addition, expressions of marker genes in differentiated osteoblasts were down-regulated by TNF-α in a manner consistent with our findings for POEM, while over-expression of POEM recovered TNF-α-induced inhibition of osteoblast differentiation. These results suggest that TNF-α inhibits POEM expression through the NF-κB signaling pathway and down-regulation of POEM influences the inhibition of osteoblast differentiation by TNF-α.

  15. Steroid induction of therapy-resistant cytokeratin-5-positive cells in estrogen receptor-positive breast cancer through a BCL6-dependent mechanism.

    Science.gov (United States)

    Goodman, C R; Sato, T; Peck, A R; Girondo, M A; Yang, N; Liu, C; Yanac, A F; Kovatich, A J; Hooke, J A; Shriver, C D; Mitchell, E P; Hyslop, T; Rui, H

    2016-03-17

    Therapy resistance remains a major problem in estrogen receptor-α (ERα)-positive breast cancer. A subgroup of ERα-positive breast cancer is characterized by mosaic presence of a minor population of ERα-negative cancer cells expressing the basal cytokeratin-5 (CK5). These CK5-positive cells are therapy resistant and have increased tumor-initiating potential. Although a series of reports document induction of the CK5-positive cells by progestins, it is unknown if other 3-ketosteroids share this ability. We now report that glucocorticoids and mineralocorticoids effectively expand the CK5-positive cell population. CK5-positive cells induced by 3-ketosteroids lacked ERα and progesterone receptors, expressed stem cell marker, CD44, and displayed increased clonogenicity in soft agar and broad drug-resistance in vitro and in vivo. Upregulation of CK5-positive cells by 3-ketosteroids required induction of the transcriptional repressor BCL6 based on suppression of BCL6 by two independent BCL6 small hairpin RNAs or by prolactin. Prolactin also suppressed 3-ketosteroid induction of CK5+ cells in T47D xenografts in vivo. Survival analysis with recursive partitioning in node-negative ERα-positive breast cancer using quantitative CK5 and BCL6 mRNA or protein expression data identified patients at high or low risk for tumor recurrence in two independent patient cohorts. The data provide a mechanism by which common pathophysiological or pharmacologic elevations in glucocorticoids or other 3-ketosteroids may adversely affect patients with mixed ERα+/CK5+ breast cancer. The observations further suggest a cooperative diagnostic utility of CK5 and BCL6 expression levels and justify exploring efficacy of inhibitors of BCL6 and 3-ketosteroid receptors for a subset of ERα-positive breast cancers.

  16. TALE activators regulate gene expression in a position- and strand-dependent manner in mammalian cells.

    Science.gov (United States)

    Uhde-Stone, Claudia; Cheung, Edna; Lu, Biao

    2014-01-24

    Transcription activator-like effectors (TALEs) are a class of transcription factors that are readily programmable to regulate gene expression. Despite their growing popularity, little is known about binding site parameters that influence TALE-mediated gene activation in mammalian cells. We demonstrate that TALE activators modulate gene expression in mammalian cells in a position- and strand-dependent manner. To study the effects of binding site location, we engineered TALEs customized to recognize specific DNA sequences located in either the promoter or the transcribed region of reporter genes. We found that TALE activators robustly activated reporter genes when their binding sites were located within the promoter region. In contrast, TALE activators inhibited the expression of reporter genes when their binding sites were located on the sense strand of the transcribed region. Notably, this repression was independent of the effector domain utilized, suggesting a simple blockage mechanism. We conclude that TALE activators in mammalian cells regulate genes in a position- and strand-dependent manner that is substantially different from gene activation by native TALEs in plants. These findings have implications for optimizing the design of custom TALEs for genetic manipulation in mammalian cells.

  17. The Relations of Parental Warmth and Positive Expressiveness to Children's Empathy-Related Responding and Social Functioning: A Longitudinal Study.

    Science.gov (United States)

    Zhou, Qing; Eisenberg, Nancy; Losoya, Sandra H.; Fabes, Richard A.; Reiser, Mark; Guthrie, Ivanna K.; Murphy, Bridget C.; Cumberland, Amanda J.; Shepard, Stephanie A.

    2002-01-01

    Examined the concurrent and cross-time relations of parents' warmth and positive expressivity to elementary school children's situational facial and self-reported empathic responding, social competence, and externalizing problems. Found that parents' positive expressivity mediated the relation between parental warmth and children's empathy, and…

  18. Expression of adhesion and activation molecules on lymphocytes during open-heart surgery with cardiopulmonary bypass

    DEFF Research Database (Denmark)

    Toft, P; Tønnesen, Else Kirstine; Zülow, I

    1997-01-01

    Open-heart surgery with cardiopulmonary bypass (CPB) and abdominal surgery are associated with lymphocytopenia. We measured a panel of adhesion and activation molecules on lymphocytes to clarify possible association of CPB with increased expression of these molecules. Eight patients undergoing open......-heart surgery and eight with abdominal surgery were studied. The adhesion molecules CD11a/CD18 (LFA-1_, CD11c/CD18 and CD44 and the activation molecules CD25, CD69, CD71 and MHCII were measured, using monoclonal antibodies and flow cytometry. Lymphocytopenia was observed during CPB and for some hours after both...... open-heart and abdominal surgery. The proportion of CD11a/CD18-positive lymphocytes rose from 67.6 +/- 8% to 86.4 +/- 3% after aortic declamping (p

  19. Position effect modifying gene expression in a patient with ring chromosome 14.

    Science.gov (United States)

    Guilherme, Roberta Santos; Moysés-Oliveira, Mariana; Dantas, Anelisa Gollo; Meloni, Vera Ayres; Colovati, Mileny Esbravatti; Kulikowski, Leslie Domenici; Melaragno, Maria Isabel

    2016-05-01

    The clinical phenotype of patients with ring chromosomes usually reflects the loss of genomic material during ring formation. However, phenotypic alterations can also be found in the presence of complete ring chromosomes, in which the breakage and rejoining in terminal regions of both chromosome arms result in no gene loss. Here, we present a patient with a ring chromosome 14 that lost nothing but the telomeres. Since he and other patients with a similar chromosome abnormality present certain abnormal characteristics, we investigated the gene expression of eight chromosome 14 genes to find out whether the configuration of the ring had changed it, possibly producing some of these clinical features. The expression of these eight genes was studied by quantitative real-time polymerase chain reaction (qPCR) in the patient and in seven controls matched for gender and age. Two of them were found to be downregulated in the patient compared to the controls, indicating that his phenotype might be related to alterations in the expression of genes located in the abnormal chromosome, even when the copy number is normal. Thus, the phenotypic alterations found in the presence of complete ring chromosomes may be related to changes in the chromatin architecture, bringing about a change of expression by position effect. These results may explain some of the characteristics presented by our patient.

  20. The Truncated Gene cfaD′ Positively Regulates CFA/Ⅰ Expression of Enterotoxigenic Escherichia coli

    Institute of Scientific and Technical Information of China (English)

    齐小保; 徐建国

    2004-01-01

    The gene cluster cfaABCED′ of enterotoxigenic Escherichia coli, encoding the fimbriae which is called colonization factor antigen Ⅰ (CFA/Ⅰ), located on a plasmid. It is positively regulated by cfaR, a member of the AraC family, and the cfaD′ gene region, which is located downstream of cfaE and is homologous to cfaR, had been described as a truncated cryptic gene. In the present study we observed that the CFA/Ⅰ fimbriae subunit, cfaB, was expressed in lower amount by the cfoABCED′ clone pNTP513 in host E. coli HB101. The expression of CFA/Ⅰ diminished by deletion of cfaD′ gene region from pNTP513, and was restored by acquisition of cfaD′ in trans. Furthermore, CFA/Ⅰ expression by cfaD′ deletion mutant, the cfaABCE clone, was remarkably increased by the presence of CFA/Ⅰ in trans in a topoisomerase A deficient strain of E. coli DM800. These data suggest that cfaD′ region is a functional region of gene, that regulates the CFA/Ⅰ expression with cfaR by unknown mechanism.

  1. Physical exercise as an epigenetic modulator: Eustress, the "positive stress" as an effector of gene expression.

    Science.gov (United States)

    Sanchis-Gomar, Fabian; Garcia-Gimenez, Jose Luis; Perez-Quilis, Carme; Gomez-Cabrera, Mari Carmen; Pallardo, Federico V; Lippi, Giuseppe

    2012-12-01

    Physical exercise positively influences epigenetic mechanisms and improves health. Several issues remain unclear concerning the links between physical exercise and epigenetics. There is growing concern about the negative influence of excessive and persistent physical exercise on health. How an individual physically adapts to the prevailing environmental conditions might influence epigenetic mechanisms and modulate gene expression. In this article, we put forward the idea that physical exercise, especially long-term repetitive strenuous exercise, positively affects health, reduces the aging process, and decreases the incidence of cancer through induced stress and epigenetic mechanisms. We propose herein that stress may stimulate genetic adaptations through epigenetics that, in turn, modulate the link between the environment, human lifestyle factors, and genes.

  2. Detecting subtle expressions: older adults demonstrate automatic and controlled positive response bias in emotional perception.

    Science.gov (United States)

    Johnson, Dan R; Whiting, Wythe L

    2013-03-01

    The present study examined age differences in emotional perception for the detection of low-intensity, single-emotion facial expressions. Confirming the "positivity effect," at 60 ms and 2,000 ms presentation rates older adults (age = 61+ years, n = 39) exhibited a response bias favoring happy over neutral responses, whereas younger adults (age = 18-23 years, n = 40) favored neutral responses. Furthermore, older adults favored neutral over fearful responses at the 60 ms presentation rate, relative to younger adults. The finding that age differences in response bias were most pronounced at the 60 ms versus 2,000 ms presentation rate suggests that positivity effects in emotional perception rely partly on automatic processing.

  3. Positive and negative expressions of shyness in toddlers: are they related to anxiety in the same way?

    Science.gov (United States)

    Colonnesi, Cristina; Napoleone, Elisa; Bögels, Susan M

    2014-04-01

    Shyness has generally been investigated as a negative and unpleasant emotional state, strongly related to social anxiety and loneliness. However, recent evidence has suggested that shyness may have a positive and socially adaptive form. We examined whether the positive expression of shyness differs from the negative expression of shyness during toddlerhood, and whether a negative relation to anxiety exists. Participants were 30-month-old children (N=102; 56 girls) who were asked to mimic animal sounds with a novel person (performance) and then to watch their performance (self-watching). Their expression of pleasure (positive reactions) and distress (negative reactions), as well as their positive and negative expressions of shyness, were coded. Children's temperamental level of shyness, sociability, and anxiety were measured with parent-reported questionnaires. Toddlers produced more positive and negative displays of shyness in the performance task than in the self-watching task. Children's positive expression of shyness was associated with lower parent-reported anxiety and higher sociability. Negative reactions, but not negative shyness, were related to children's higher anxiety levels and lower sociability. Multiple linear regression analyses confirmed a negative predictive role of the positive expression of shyness on anxiety. These results suggest that the positive expression of shyness can regulate early anxiety symptoms and already serves a social function in interpersonal interactions in early childhood.

  4. Low expression of a few genes indicates good prognosis in estrogen receptor positive breast cancer

    Directory of Open Access Journals (Sweden)

    Buechler Steven

    2009-07-01

    Full Text Available Abstract Background Many breast cancer patients remain free of distant metastasis even without adjuvant chemotherapy. While standard histopathological tests fail to identify these good prognosis patients with adequate precision, analyses of gene expression patterns in primary tumors have resulted in more successful diagnostic tests. These tests use continuous measurements of the mRNA concentrations of numerous genes to determine a risk of metastasis in lymph node negative breast cancer patients with other clinical traits. Methods A survival model is constructed from genes that are both connected with relapse and have expression patterns that define distinct subtypes, suggestive of different cellular states. This in silico study uses publicly available microarray databases generated with Affymetrix GeneChip technology. The genes in our model, as represented by array probes, have distinctive distributions in a patient cohort, consisting of a large normal component of low expression values; and a long right tail of high expression values. The cutoff between low and high expression of a probe is determined from the distribution using the theory of mixture models. The good prognosis group in our model consists of the samples in the low expression component of multiple genes. Results Here, we define a novel test for risk of metastasis in estrogen receptor positive (ER+ breast cancer patients, using four probes that determine distinct subtypes. The good prognosis group in this test, denoted AP4-, consists of the samples with low expression of each of the four probes. Two probes target MKI67, antigen identified by monoclonal antibody Ki-67, one targets CDC6, cell division cycle 6 homolog (S. cerevisiae, and a fourth targets SPAG5, sperm associated antigen 5. The long-term metastasis-free survival probability for samples in AP4- is sufficiently high to render chemotherapy of questionable benefit. Conclusion A breast cancer subtype defined by low

  5. BMP-2 Induced Expression of Alx3 That Is a Positive Regulator of Osteoblast Differentiation.

    Directory of Open Access Journals (Sweden)

    Takashi Matsumoto

    Full Text Available Bone morphogenetic proteins (BMPs regulate many aspects of skeletal development, including osteoblast and chondrocyte differentiation, cartilage and bone formation, and cranial and limb development. Among them, BMP-2, one of the most potent osteogenic signaling molecules, stimulates osteoblast differentiation, while it inhibits myogenic differentiation in C2C12 cells. To evaluate genes involved in BMP-2-induced osteoblast differentiation, we performed cDNA microarray analyses to compare BMP-2-treated and -untreated C2C12 cells. We focused on Alx3 (aristaless-like homeobox 3 which was clearly induced during osteoblast differentiation. Alx3, a homeobox gene related to the Drosophilaaristaless gene, has been linked to developmental functions in craniofacial structures and limb development. However, little is known about its direct relationship with bone formation. In the present study, we focused on the mechanisms of Alx3 gene expression and function during osteoblast differentiation induced by BMP-2. In C2C12 cells, BMP-2 induced increase of Alx3 gene expression in both time- and dose-dependent manners through the BMP receptors-mediated SMAD signaling pathway. In addition, silencing of Alx3 by siRNA inhibited osteoblast differentiation induced by BMP-2, as showed by the expressions of alkaline phosphatase (Alp, Osteocalcin, and Osterix, while over-expression of Alx3 enhanced osteoblast differentiation induced by BMP-2. These results indicate that Alx3 expression is enhanced by BMP-2 via the BMP receptors mediated-Smad signaling and that Alx3 is a positive regulator of osteoblast differentiation induced by BMP-2.

  6. Joint QTL mapping and gene expression analysis identify positional candidate genes influencing pork quality traits

    Science.gov (United States)

    González-Prendes, Rayner; Quintanilla, Raquel; Cánovas, Angela; Manunza, Arianna; Figueiredo Cardoso, Tainã; Jordana, Jordi; Noguera, José Luis; Pena, Ramona N.; Amills, Marcel

    2017-01-01

    Meat quality traits have an increasing importance in the pig industry because of their strong impact on consumer acceptance. Herewith, we have combined phenotypic and microarray expression data to map loci with potential effects on five meat quality traits recorded in the longissimus dorsi (LD) and gluteus medius (GM) muscles of 350 Duroc pigs, i.e. pH at 24 hours post-mortem (pH24), electric conductivity (CE) and muscle redness (a*), lightness (L*) and yellowness (b*). We have found significant genome-wide associations for CE of LD on SSC4 (~104 Mb), SSC5 (~15 Mb) and SSC13 (~137 Mb), while several additional regions were significantly associated with meat quality traits at the chromosome-wide level. There was a low positional concordance between the associations found for LD and GM traits, a feature that reflects the existence of differences in the genetic determinism of meat quality phenotypes in these two muscles. The performance of an eQTL search for SNPs mapping to the regions associated with meat quality traits demonstrated that the GM a* SSC3 and pH24 SSC17 QTL display positional concordance with cis-eQTL regulating the expression of several genes with a potential role on muscle metabolism. PMID:28054563

  7. CD8 positive T cells express IL-17 in patients with chronic obstructive pulmonary disease

    Directory of Open Access Journals (Sweden)

    Eidelman David H

    2011-04-01

    Full Text Available Abstract Background Chronic obstructive pulmonary disease (COPD is a progressive and irreversible chronic inflammatory disease of the lung. The nature of the immune reaction in COPD raises the possibility that IL-17 and related cytokines may contribute to this disorder. This study analyzed the expression of IL-17A and IL-17F as well as the phenotype of cells producing them in bronchial biopsies from COPD patients. Methods Bronchoscopic biopsies of the airway were obtained from 16 COPD subjects (GOLD stage 1-4 and 15 control subjects. Paraffin sections were used for the investigation of IL-17A and IL-17F expression in the airways by immunohistochemistry, and frozen sections were used for the immunofluorescence double staining of IL-17A or IL-17F paired with CD4 or CD8. In order to confirm the expression of IL-17A and IL-17F at the mRNA level, a quantitative RT-PCR was performed on the total mRNA extracted from entire section or CD8 positive cells selected by laser capture microdissection. Results IL-17F immunoreactivity was significantly higher in the bronchial biopsies of COPD patients compared to control subjects (P P P P Conclusion These findings support the notion that Th17 cytokines could play important roles in the pathogenesis of COPD, raising the possibility of using this mechanism as the basis for novel therapeutic approaches.

  8. Positive association between physical activity and PER3 expression in older adults

    Science.gov (United States)

    Takahashi, Masaki; Haraguchi, Atsushi; Tahara, Yu; Aoki, Natsumi; Fukazawa, Mayuko; Tanisawa, Kumpei; Ito, Tomoko; Nakaoka, Takashi; Higuchi, Mitsuru; Shibata, Shigenobu

    2017-01-01

    The circadian clock regulates many physiological functions including physical activity and feeding patterns. In addition, scheduled exercise and feeding themselves can affect the circadian clock. The purpose of the present study was to investigate the relationship between physical/feeding activity and expression of clock genes in hair follicle cells in older adults. Twenty adult men (age, 68 ± 7 years, mean ± SE) were examined in this cross-sectional study. Prior to hair follicle cell collection, the participants were asked to wear a uniaxial accelerometer for one week. The timings of breakfast, lunch, and dinner were also recorded. Hair follicle cells were then collected over a 24 h period at 4 h intervals. The amplitude of PER3 expression was positively correlated with moderate and vigorous physical activity (r = 0.582, p = 0.007) and peak oxygen uptake (r = 0.481, p = 0.032), but these correlations were not observed for NR1D1 or NR1D2. No association was noted between meal times and the amplitude or the acrophase for any of these three clock genes. These findings suggest that rhythmic expression of the circadian clock gene PER3 is associated with the amount of daily physical activity and physical fitness in older adults. PMID:28045078

  9. Positive Regulation of Interleukin-2 Expression by a Pseudokinase, Tribbles 1, in Activated T Cells.

    Science.gov (United States)

    Miyajima, Chiharu; Itoh, Yuka; Inoue, Yasumichi; Hayashi, Hidetoshi

    2015-01-01

    Tribbles 1 (TRB1), a member of the Tribbles family, is a pseudokinase that is conserved among species and implicated in various human diseases including leukemia, cardiovascular diseases, and metabolic disorders. However, the role of TRB1 in the immune response is not understood. To evaluate this role, we examined regulation of TRB1 expression and the function of TRB1 in interleukin-2 (IL-2) induction in Jurkat cells, a human acute T cell leukemia cell line. We found that TRB1 was strongly induced by phorbol 12-myristate 13-acetate (PMA) and ionomycin in these cells. IL-2 expression was induced in Jurkat cells activated by PMA and ionomycin; however, knockdown of TRB1 resulted in decreased induction of IL-2. TRB1 null Jurkat cells established using the CRISPR/Cas9 system also showed reduction of IL-2 expression on PMA/ionomycin stimulation. TRB1 knockdown also markedly inhibited IL-2 promoter activation. To determine the mechanism of the stimulatory effect on IL-2 induction, we focused on histone deacetylases (HDACs), and found that HDAC1 preferentially interacts with TRB1. TRB1 suppressed the interaction of HDAC1 with nuclear factor of activated T cells 2 (NFAT2), which is a crucial transcription factor for IL-2 induction. These results indicate that TRB1 is a positive regulator of IL-2 induction in activated T cells.

  10. Exponential Expression of Relating Different Positive Point Electrode for Small Air Gap Distance

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    John Tarilanyo Afa

    2010-09-01

    Full Text Available The purpose of this research is to draw a-mathematical relationship between different positive point electrodes using air as the dielectric medium for small gap distance. Four electrodes with varying radius of curvature were used at gap distance ranging from 1 to 12.5 cm under the same atmospheric condition. These results were graphically analyzed after finding the fifty percent probability (V50% of the breakdown voltage. Using the exponential form in expressing them, a general formula was derived for the breakdown voltage for sharply non-uniform field for small air gap distances. The humidity level was noted because of the varying humidity level of environment. The spark over voltage increases with humidity therefore the wet and dry bulb readings were taken before each experiment and the required correction factors were noted.

  11. Construction of Nef-positive doxycycline-dependent HIV-1 variants using bicistronic expression elements

    Energy Technology Data Exchange (ETDEWEB)

    Velden, Yme U. van der; Kleibeuker, Wendy; Harwig, Alex; Klaver, Bep; Siteur-van Rijnstra, Esther; Frankin, Esmay; Berkhout, Ben; Das, Atze T., E-mail: a.t.das@amc.uva.nl

    2016-01-15

    Conditionally replicating HIV-1 variants that can be switched on and off at will are attractive tools for HIV research. We previously developed a genetically modified HIV-1 variant that replicates exclusively when doxycycline (dox) is administered. The nef gene in this HIV-rtTA variant was replaced with the gene encoding the dox-dependent rtTA transcriptional activator. Because loss of Nef expression compromises virus replication in primary cells and precludes studies on Nef function, we tested different approaches to restore Nef production in HIV-rtTA. Strategies that involved translation via an EMCV or synthetic internal ribosome entry site (IRES) failed because these elements were incompatible with efficient virus replication. Fusion protein approaches with the FMDV 2A peptide and human ubiquitin were successful and resulted in genetically-stable Nef-expressing HIV-rtTA strains that replicate more efficiently in primary T-cells and human immune system (HIS) mice than Nef-deficient variants, thus confirming the positive effect of Nef on in vivo virus replication. - Highlights: • Different approaches to encode additional proteins in the HIV-1 genome were tested. • IRES translation elements are incompatible with efficient HIV-1 replication. • Ubiquitin and 2A fusion protein approaches allow efficient HIV-1 replication. • Doxycycline-controlled HIV-1 variants that encode all viral proteins were developed. • Nef stimulates HIV-rtTA replication in primary cells and human immune system mice.

  12. Differentially expressed miRNAs in cancer-stem-like cells: markers for tumor cell aggressiveness of pancreatic cancer.

    Science.gov (United States)

    Bao, Bin; Ali, Shadan; Ahmad, Aamir; Li, Yiwei; Banerjee, Sanjeev; Kong, Dejuan; Aboukameel, Amro; Mohammad, Ramzi; Van Buren, Eric; Azmi, Asfar S; Sarkar, Fazlul H

    2014-08-15

    Pancreatic cancer (PC) is one of the most deadly cancers. The higher mortality is in part due to treatment resistance and early onset of metastasis. The existence of cancer-stem-like cells (CSLCs) has been widely accepted to be responsible for tumor aggressiveness in PC. Emerging evidence suggests that CSLCs have the capacity for increased cell growth, cell migration/invasion, metastasis, and treatment resistance, which leads to poor clinical outcome. However, the molecular role of CSLCs in tumor development and progression is poorly understood. Therefore, mechanistic understanding, and targeted killing of CSLCs may provide a newer therapeutic strategy for the treatment of PC. It has been well accepted that microRNAs (miRNAs) play critical roles during tumor development and progression through deregulation of multiple genes. Moreover, deregulated expression of miRNAs may also play a key role in the regulation of CSLC characteristics and functions. Here we show that isolated CD44(+)/CD133(+)/EpCAM(+) cells (triple-marker-positive cells) from human PC cell lines, MiaPaCa-2 and L3.6pl cells, display aggressive characteristics, such as increased cell growth, clonogenicity, cell migration, and self-renewal capacity, which is consistent with overexpression of CSLC signatures/markers. We also found deregulated expression of over 400 miRNAs, including let-7, miR-30, miR-125b, and miR-335, in CSLCs. As a proof-of-concept, knockdown of miR-125b resulted in the inhibition of tumor cell aggressiveness of CSLCs (triple-marker-positive cells), consistent with the downregulation of CD44, EpCAM, EZH2, and snail. These results clearly suggest the importance of miRNAs in the regulation of CSLC characteristics, and may serve as novel targets for therapy.

  13. Emotional expressions of old faces are perceived as more positive and less negative than young faces in young adults

    OpenAIRE

    2015-01-01

    Interpreting the emotions of others through their facial expressions can provide important social information, yet the way in which we judge an emotion is subject to psychosocial factors. We hypothesized that the age of a face would bias how the emotional expressions are judged, with older faces generally more likely to be viewed as having more positive and less negative expressions than younger faces. Using two-alternative forced-choice perceptual decision tasks, participants sorted young an...

  14. Emotional Expressions of Old Faces Are Perceived as More Positive and Less Negative than Young Faces in Young Adults

    OpenAIRE

    2015-01-01

    Interpreting the emotions of others through their facial expressions can provide important social information, yet the way in which we judge an emotion is subject to psychosocial factors. We hypothesized that the age of a face would bias how the emotional expressions are judged, with older faces generally more likely to be viewed as having more positive and less negative expressions than younger faces. Using two-alternative forced-choice perceptual decision tasks, participants sorted young an...

  15. Hydrocellular foam dressing promotes wound healing along with increases in hyaluronan synthase 3 and PPARα gene expression in epidermis.

    Directory of Open Access Journals (Sweden)

    Takumi Yamane

    Full Text Available BACKGROUND: Hydrocellular foam dressing, modern wound dressing, induces moist wound environment and promotes wound healing: however, the regulatory mechanisms responsible for these effects are poorly understood. This study was aimed to reveal the effect of hydrocellular foam dressing on hyaluronan, which has been shown to have positive effects on wound healing, and examined its regulatory mechanisms in rat skin. METHODOLOGY/PRINCIPAL FINDINGS: We created two full-thickness wounds on the dorsolateral skin of rats. Each wound was covered with either a hydrocellular foam dressing or a film dressing and hyaluronan levels in the periwound skin was measured. We also investigated the mechanism by which the hydrocellular foam dressing regulates hyaluronan production by measuring the gene expression of hyaluronan synthase 3 (Has3, peroxisome proliferator-activated receptor α (PPARα, and CD44. Hydrocellular foam dressing promoted wound healing and upregulated hyaluronan synthesis, along with an increase in the mRNA levels of Has3, which plays a primary role in hyaluronan synthesis in epidermis. In addition, hydrocellular foam dressing enhanced the mRNA levels of PPARα, which upregulates Has3 gene expression, and the major hyaluronan receptor CD44. CONCLUSIONS/SIGNIFICANCE: These findings suggests that hydrocellular foam dressing may be beneficial for wound healing along with increases in hyaluronan synthase 3 and PPARα gene expression in epidermis. We believe that the present study would contribute to the elucidation of the mechanisms underlying the effects of hydrocellular foam dressing-induced moist environment on wound healing and practice evidence-based wound care.

  16. Carotenoid supplementation positively affects the expression of a non-visual sexual signal.

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    Alain J-M Van Hout

    Full Text Available Carotenoids are a class of pigments which are widely used by animals for the expression of yellow-to-red colour signals, such as bill or plumage colour. Since they also have been shown to promote immunocompetence and to function as antioxidants, many studies have investigated a potential allocation trade-off with respect to carotenoid-based signals within the context of sexual selection. Although an effect of carotenoids on non-visual (e.g. acoustic signals involved in sexual selection has been hypothesized, this has to date not been investigated. First, we examined a potential effect of dietary carotenoid supplementation on overall song rate during the non-breeding season in captive male European starlings (Sturnus vulgaris. After only 3-7 days, we found a significant (body-mass independent positive effect of carotenoid availability on overall song rate. Secondly, as a number of studies suggest that carotenoids could affect the modulation of sexual signals by plasma levels of the steroid hormone testosterone (T, we used the same birds to subsequently investigate whether carotenoid availability affects the increase in (nestbox-oriented song rate induced by experimentally elevated plasma T levels. Our results suggest that carotenoids may enhance the positive effect of elevated plasma T levels on nestbox-oriented song rate. Moreover, while non-supplemented starlings responded to T-implantation with an increase in both overall song rate and nestbox-oriented song, carotenoid-supplemented starlings instead shifted song production towards (reproductively relevant nestbox-oriented song, without increasing overall song rate. Given that song rate is an acoustic signal rather than a visual signal, our findings therefore indicate that the role of carotenoids in (sexual signalling need not be dependent on their function as pigments.

  17. CSR-1 RNAi pathway positively regulates histone expression in C. elegans.

    Science.gov (United States)

    Avgousti, Daphne C; Palani, Santhosh; Sherman, Yekaterina; Grishok, Alla

    2012-10-03

    Endogenous small interfering RNAs (endo-siRNAs) have been discovered in many organisms, including mammals. In C. elegans, depletion of germline-enriched endo-siRNAs found in complex with the CSR-1 Argonaute protein causes sterility and defects in chromosome segregation in early embryos. We discovered that knockdown of either csr-1, the RNA-dependent RNA polymerase (RdRP) ego-1, or the dicer-related helicase drh-3, leads to defects in histone mRNA processing, resulting in severe depletion of core histone proteins. The maturation of replication-dependent histone mRNAs, unlike that of other mRNAs, requires processing of their 3'UTRs through an endonucleolytic cleavage guided by the U7 snRNA, which is lacking in C. elegans. We found that CSR-1-bound antisense endo-siRNAs match histone mRNAs and mRNA precursors. Consistently, we demonstrate that CSR-1 directly binds to histone mRNA in an ego-1-dependent manner using biotinylated 2'-O-methyl RNA oligonucleotides. Moreover, we demonstrate that increasing the dosage of histone genes rescues the lethality associated with depletion of CSR-1 and EGO-1. These results support a positive and direct effect of RNAi on histone gene expression.

  18. Difference in hTERT Gene Expressions between HbsAg-Positive and HbsAg-Negative Hepatocellular Carcinoma

    Institute of Scientific and Technical Information of China (English)

    GUO Yueqing; ZHOU Xu; LIU Enyu; LI Xingrui; LIU Jinwen; YANG Zhifang; YI Jilin

    2005-01-01

    Summary: To investigate the difference in expression of hTERT gene between HbsAg-positive human hepatocellular carcinoma (HCC) and HbsAg-negative HCC and to explore the relationship between HBV infection and hTERT gene expression in HCC. The expression of hTERT protein in 30 cases of HbsAg positive HCC and 17 cases of HbsAg negative HCC was detected by immunohistochemistry (SP method), and the expression of hTERT mRNA was analyzed by reverse transcription polymerase chain reaction (RT-PCR). t-test, Chi-squared test and cochran- armitage trend test were used to see whether there was an interrelation between HBsAg and hTERT gene in HCC. The expression of hTERT protein was mostly located in plasm and occasionally in the nucleus of liver cancer cells. The positive rate of hTERT protein and hTERT mRNA in HbsAg positive HCC- 93.33 % (28/30) and 83.33 % (25/30) respectively which were much higher than those in HbsAg negative HCC- 52.94 % (9/17), 47.06 % (8/17) (P<0.01) respectively. HbsAg is related to hTERT gene expression in human hepatocellular carcinoma. The hTERT gene activated by the efficacious ingredient of HBV may play an important role in hepatocellular transformation and carcinogenesis.

  19. P-glycoprotein is expressed and causes resistance to chemotherapy in EBV-positive T-cell lymphoproliferative diseases.

    Science.gov (United States)

    Yoshimori, Mayumi; Takada, Honami; Imadome, Ken-Ichi; Kurata, Morito; Yamamoto, Kouhei; Koyama, Takatoshi; Shimizu, Norio; Fujiwara, Shigeyoshi; Miura, Osamu; Arai, Ayako

    2015-10-01

    Epstein-Barr virus-positive T-cell lymphoproliferative diseases (EBV-T-LPDs) are rare lymphomas with poor prognosis. Although chemotherapeutic strategies such as CHOP have been often selected, they have exhibited only limited efficacy. To clarify the mechanism of chemoresistance, we examined P-glycoprotein (P-gp) expression. P-gp acts as an energy-dependent efflux pump that excretes drugs from the cytoplasm, resulting in low-intracellular drug concentrations and poor sensitivity to chemotherapy. We examined P-gp expression in EBV-positive cells by immunohistochemistry staining in three patients of EBV-T-LPDs and the expression was detected in all patients. We also examined mdr1 mRNA expression by reverse-transcriptase polymerase-chain reaction (RT-PCR) in EBV-positive tumor cells from these patients and additional three patients. The expression was detected in all examined patients. In five EBV-T-LPDs patients, P-gp function was detected by Rhodamine-123 efflux assay in these cells. The efflux was inhibited by treatment with a P-gp inhibitor, cyclosporine A (CsA). We also examined and detected P-gp expression in EBV-positive T-cell lines SNT8 and SNT16 established from EBV-T-LPDs patients, by RT-PCR and western blotting. The function was also detected by Rhodamine-123 efflux in these cell lines. Inhibition and knock down of P-gp by CsA and siRNA, respectively, enhanced etoposide- and doxorubicin-induced cell death in the EBV-positive T-cell lines. Finally, we infected the T-cell line MOLT4 with EBV, and found that mdr1 mRNA expression and Rhodamine 123 efflux were upregulated after infection. These results indicated that enhanced P-gp expression contributed to the chemoresistance of EBV-T-LPDs.

  20. PGC1α -1 Nucleosome Position and Splice Variant Expression and Cardiovascular Disease Risk in Overweight and Obese Individuals.

    Science.gov (United States)

    Henagan, Tara M; Stewart, Laura K; Forney, Laura A; Sparks, Lauren M; Johannsen, Neil; Church, Timothy S

    2014-01-01

    PGC1α, a transcriptional coactivator, interacts with PPARs and others to regulate skeletal muscle metabolism. PGC1α undergoes splicing to produce several mRNA variants, with the NTPGC1α variant having a similar biological function to the full length PGC1α (FLPGC1α). CVD is associated with obesity and T2D and a lower percentage of type 1 oxidative fibers and impaired mitochondrial function in skeletal muscle, characteristics determined by PGC1α expression. PGC1α expression is epigenetically regulated in skeletal muscle to determine mitochondrial adaptations, and epigenetic modifications may regulate mRNA splicing. We report in this paper that skeletal muscle PGC1α  -1 nucleosome (-1N) position is associated with splice variant NTPGC1α but not FLPGC1α expression. Division of participants based on the -1N position revealed that those individuals with a -1N phased further upstream from the transcriptional start site (UP) expressed lower levels of NTPGC1α than those with the -1N more proximal to TSS (DN). UP showed an increase in body fat percentage and serum total and LDL cholesterol. These findings suggest that the -1N may be a potential epigenetic regulator of NTPGC1α splice variant expression, and -1N position and NTPGC1α variant expression in skeletal muscle are linked to CVD risk. This trial is registered with clinicaltrials.gov, identifier NCT00458133.

  1. PGC1α −1 Nucleosome Position and Splice Variant Expression and Cardiovascular Disease Risk in Overweight and Obese Individuals

    Directory of Open Access Journals (Sweden)

    Tara M. Henagan

    2014-01-01

    Full Text Available PGC1α, a transcriptional coactivator, interacts with PPARs and others to regulate skeletal muscle metabolism. PGC1α undergoes splicing to produce several mRNA variants, with the NTPGC1α variant having a similar biological function to the full length PGC1α (FLPGC1α. CVD is associated with obesity and T2D and a lower percentage of type 1 oxidative fibers and impaired mitochondrial function in skeletal muscle, characteristics determined by PGC1α expression. PGC1α expression is epigenetically regulated in skeletal muscle to determine mitochondrial adaptations, and epigenetic modifications may regulate mRNA splicing. We report in this paper that skeletal muscle PGC1α  −1 nucleosome (−1N position is associated with splice variant NTPGC1α but not FLPGC1α expression. Division of participants based on the −1N position revealed that those individuals with a −1N phased further upstream from the transcriptional start site (UP expressed lower levels of NTPGC1α than those with the −1N more proximal to TSS (DN. UP showed an increase in body fat percentage and serum total and LDL cholesterol. These findings suggest that the −1N may be a potential epigenetic regulator of NTPGC1α splice variant expression, and −1N position and NTPGC1α variant expression in skeletal muscle are linked to CVD risk. This trial is registered with clinicaltrials.gov, identifier NCT00458133.

  2. Distinct Factors Associated with Head Start Mothers' Self-Report of Perceived Low Positive and High Negative Maternal Expressiveness

    Science.gov (United States)

    Edwards, Nicole Megan

    2014-01-01

    Research Findings: There is growing acknowledgment of the need for parenting interventions to address early-onset behavior and emotional concerns. Favorable child outcomes have been linked to parents' responsiveness and positive expressiveness. Given the theoretical and empirical link between perceptions and actual behavior, Head Start mothers…

  3. Oral Cnm-positive Streptococcus Mutans Expressing Collagen Binding Activity is a Risk Factor for Cerebral Microbleeds and Cognitive Impairment

    Science.gov (United States)

    Watanabe, Isao; Kuriyama, Nagato; Miyatani, Fumitaro; Nomura, Ryota; Naka, Shuhei; Nakano, Kazuhiko; Ihara, Masafumi; Iwai, Komei; Matsui, Daisuke; Ozaki, Etsuko; Koyama, Teruhide; Nishigaki, Masaru; Yamamoto, Toshiro; Tamura, Aiko; Mizuno, Toshiki; Akazawa, Kentaro; Takada, Akihiro; Takeda, Kazuo; Yamada, Kei; Nakagawa, Masanori; Tanaka, Tokutaro; Kanamura, Narisato; Friedland, Robert P.; Watanabe, Yoshiyuki

    2016-01-01

    Cerebral microbleeds (CMBs) are an important risk factor for stroke and dementia. We have shown that the collagen binding surface Cnm protein expressed on cnm-positive Streptococcus mutans is involved in the development of CMBs. However, whether the collagen binding activity of cnm-positive S. mutans is related to the nature of the CMBs or to cognitive impairment is unclear. Two-hundred seventy nine community residents (70.0 years) were examined for the presence or absence of cnm-positive S. mutans in the saliva by PCR and collagen binding activity, CMBs, and cognitive function were evaluated. Cnm-positive S. mutans was detected more often among subjects with CMBs (p < 0.01) than those without. The risk of CMBs was significantly higher (odds ratio = 14.3) in the group with S. mutans expressing collagen binding activity, as compared to the group without that finding. Deep CMBs were more frequent (67%) and cognitive function was lower among subjects with cnm-positive S. mutans expressing collagen binding activity. This work supports the role of oral health in stroke and dementia and proposes a molecular mechanism for the interaction. PMID:27934941

  4. Attenuating HIV Tat/TAR-mediated protein expression by exploring the side chain length of positively charged residues.

    Science.gov (United States)

    Wu, Cheng-Hsun; Chen, Yi-Ping; Liu, Shing-Lung; Chien, Fan-Ching; Mou, Chung-Yuan; Cheng, Richard P

    2015-12-07

    RNA is a drug target involved in diverse cellular functions and viral processes. Molecules that inhibit the HIV TAR RNA-Tat protein interaction may attenuate Tat/TAR-dependent protein expression and potentially serve as anti-HIV therapeutics. By incorporating positively charged residues with mixed side chain lengths, we designed peptides that bind TAR RNA with enhanced intracellular activity. Tat-derived peptides that were individually substituted with positively charged residues with varying side chain lengths were evaluated for TAR RNA binding. Positively charged residues with different side chain lengths were incorporated at each Arg and Lys position in the Tat-derived peptide to enhance TAR RNA binding. The resulting peptides showed enhanced TAR RNA binding affinity, cellular uptake, nuclear localization, proteolytic resistance, and inhibition of intracellular Tat/TAR-dependent protein expression compared to the parent Tat-derived peptide with no cytotoxicity. Apparently, the enhanced inhibition of protein expression by these peptides was not determined by RNA binding affinity, but by proteolytic resistance. Despite the high TAR binding affinity, a higher binding specificity would be necessary for practical purposes. Importantly, altering the positively charged residue side chain length should be a viable strategy to generate potentially useful RNA-targeting bioactive molecules.

  5. Microarray-based analysis of microRNA expression in breast cancer stem cells

    Directory of Open Access Journals (Sweden)

    Wang Zhi-xin

    2010-12-01

    Full Text Available Abstract Background This study aimed to determine the miRNA profile in breast cancer stem cells (BCSCs and to explore the functions of characteristic BCSC miRNAs. Methods We isolated ESA+CD44+CD24-/low BCSCs from MCF-7 cells using fluorescence-activated cell sorting (FACS. A human breast cancer xenograft assay was performed to validate the stem cell properties of the isolated cells, and microarray analysis was performed to screen for BCSC-related miRNAs. These BCSC-related miRNAs were selected for bioinformatic analysis and target prediction using online software programs. Results The ESA+CD44+CD24-/low cells had up to 100- to 1000-fold greater tumor-initiating capability than the MCF-7 cells. Tumors initiated from the ESA+CD44+CD24-/low cells were included of luminal epithelial and myoepithelial cells, indicating stem cell properties. We also obtained miRNA profiles of ESA+CD44+CD24-/low BCSCs. Most of the possible targets of potential tumorigenesis-related miRNAs were oncogenes, anti-oncogenes or regulatory genes. Conclusions We identified a subset of miRNAs that were differentially expressed in BCSCs, providing a starting point to explore the functions of these miRNAs. Evaluating characteristic BCSC miRNAs represents a new method for studying breast cancer-initiating cells and developing therapeutic strategies aimed at eradicating the tumorigenic subpopulation of cells in breast cancer.

  6. Positive and negative regulation of basal expression of a yeast HSP70 gene.

    OpenAIRE

    Park, H O; Craig, E A

    1989-01-01

    The SSA1 gene, one of the heat-inducible HSP70 genes in the yeast Saccharomyces cerevisiae, also displays a basal level of expression during logarithmic growth. Multiple sites related to the heat shock element (HSE) consensus sequence are present in the SSA1 promoter region (Slater and Craig, Mol. Cell. Biol. 7:1906-1916, 1987). One of the HSEs, HSE2, is important in the basal expression of SSA1 as well as in heat-inducible expression. A promoter containing a mutant HSE2 showed a fivefold-low...

  7. Promotion of MAG-1 on Metastasis of Lung Cancer Cells in vitro and Its Expression in Lung Cancer Tissue of 24 Cases

    Directory of Open Access Journals (Sweden)

    Jinqiang ZHANG

    2009-02-01

    Full Text Available Background and objective Tumor metastasis is a multistep process with many genes involved in. A novel gene MAG-1 , identified by suppression subtractive hybridization from lung cancer cells was found to be associated with tumor metastasis. The aims of this work are to investigate the metastasis related effects of MAG-1 on human lunggiant-cell line PLA801, and to compare the expression rate of MAG-1 in cancer tissue from lung cancer patients with different metastatic status. Methods Sense and anti-sense expressing vectors of MAG-1 were constructed and transfected into PLA801C and PLA801D respectively. Colony forming, adherence assay, MTT assay and Transwell experiments were used to evaluate the alterations of clone forming, cell-matrix adherence, proliferating and invasion of the stable transfected cell strains. Western blot was employed to detect the proteins levels of CD44, and MMP-2 in cell strains and mRNAstate of MAG-1 in lung cancer tissue from patients with or without pathological metastasis were also analyzed by RTPCR. Results MAG-1 could increase cell-ECM (Extracellular Matrix adhesive capacity, promote invasion, enhance cell proliferation and had no effects on clone forming ability of PLA801 cells in soft agar. MAG-1 was also found have positive effects on the protein level of CD44 and MMP-2 in PLA801 cells, and the detection rate of MAG-1 mRNA was much higher in cancer tissue from metastatic patients (7/12 than that in non-metastatic patients (2/12. Conclusion MAG-1 could promote lung cancer metastasis and might be a metastasis associated gene of lung cancer.

  8. Positive and negative facial emotional expressions: the effect on infants' and children's facial identity recognition

    OpenAIRE

    Brenna,

    2013-01-01

    Aim of the present study was to investigate the origin and the development of the interdipendence between identity recognition and facial emotional expression processing, suggested by recent models on face processing (Calder & Young, 2005) and supported by outcomes on adults (e.g. Baudouin, Gilibert, Sansone, & Tiberghien, 2000; Schweinberger & Soukup, 1998). Particularly the effect of facial emotional expressions on infants’ and children’s ability to recognize identity of a face was explored...

  9. Tissue Specific Expression of Cre in Rat Tyrosine Hydroxylase and Dopamine Active Transporter-Positive Neurons.

    Directory of Open Access Journals (Sweden)

    Zhenyi Liu

    Full Text Available The rat is a preferred model system over the mouse for neurological studies, and cell type-specific Cre expression in the rat enables precise ablation of gene function in neurons of interest, which is especially valuable for neurodegenerative disease modeling and optogenetics. Yet, few such Cre rats are available. Here we report the characterization of two Cre rats, tyrosine hydroxylase (TH-Cre and dopamine active transporter (DAT or Slc6a3-Cre, by using a combination of immunohistochemistry (IHC and mRNA fluorescence in situ hybridization (FISH as well as a fluorescent reporter for Cre activity. We detected Cre expression in expected neurons in both Cre lines. Interestingly, we also found that in Th-Cre rats, but not DAT-Cre rats, Cre is expressed in female germ cells, allowing germline excision of the floxed allele and hence the generation of whole-body knockout rats. In summary, our data demonstrate that targeted integration of Cre cassette lead to faithful recapitulation of expression pattern of the endogenous promoter, and mRNA FISH, in addition to IHC, is an effective method for the analysis of the spatiotemporal gene expression patterns in the rat brain, alleviating the dependence on high quality antibodies that are often not available against rat proteins. The Th-Cre and the DAT-Cre rat lines express Cre in selective subsets of dopaminergic neurons and should be particularly useful for researches on Parkinson's disease.

  10. Tissue Specific Expression of Cre in Rat Tyrosine Hydroxylase and Dopamine Active Transporter-Positive Neurons.

    Science.gov (United States)

    Liu, Zhenyi; Brown, Andrew; Fisher, Dan; Wu, Yumei; Warren, Joe; Cui, Xiaoxia

    2016-01-01

    The rat is a preferred model system over the mouse for neurological studies, and cell type-specific Cre expression in the rat enables precise ablation of gene function in neurons of interest, which is especially valuable for neurodegenerative disease modeling and optogenetics. Yet, few such Cre rats are available. Here we report the characterization of two Cre rats, tyrosine hydroxylase (TH)-Cre and dopamine active transporter (DAT or Slc6a3)-Cre, by using a combination of immunohistochemistry (IHC) and mRNA fluorescence in situ hybridization (FISH) as well as a fluorescent reporter for Cre activity. We detected Cre expression in expected neurons in both Cre lines. Interestingly, we also found that in Th-Cre rats, but not DAT-Cre rats, Cre is expressed in female germ cells, allowing germline excision of the floxed allele and hence the generation of whole-body knockout rats. In summary, our data demonstrate that targeted integration of Cre cassette lead to faithful recapitulation of expression pattern of the endogenous promoter, and mRNA FISH, in addition to IHC, is an effective method for the analysis of the spatiotemporal gene expression patterns in the rat brain, alleviating the dependence on high quality antibodies that are often not available against rat proteins. The Th-Cre and the DAT-Cre rat lines express Cre in selective subsets of dopaminergic neurons and should be particularly useful for researches on Parkinson's disease.

  11. Emotional Expressions of Old Faces Are Perceived as More Positive and Less Negative than Young Faces in Young Adults

    Directory of Open Access Journals (Sweden)

    Norah C Hass

    2015-08-01

    Full Text Available Interpreting the emotions of others through their facial expressions can provide important social information, yet the way in which we judge an emotion is subject to psychosocial factors. We hypothesized that the age of a face would bias how the emotional expressions are judged, with older faces generally more likely to be viewed as having more positive and less negative expressions than younger faces. Using two-alternative forced-choice perceptual decision tasks, participants sorted young and old faces of which emotional expressions were gradually morphed into one of two categories - neutral vs. happy and neutral vs. angry. The results indicated that old faces were more frequently perceived as having a happy expression at the lower emotional intensity levels, and less frequently perceived as having an angry expression at the higher emotional intensity levels than younger faces in young adults. Critically, the perceptual decision threshold at which old faces were judged as happy was lower than for young faces, and higher for angry old faces compared to young faces. These findings suggest that the age of the face influences how its emotional expression is interpreted in social interactions.

  12. Emotional expressions of old faces are perceived as more positive and less negative than young faces in young adults.

    Science.gov (United States)

    Hass, Norah C; Schneider, Erik J S; Lim, Seung-Lark

    2015-01-01

    Interpreting the emotions of others through their facial expressions can provide important social information, yet the way in which we judge an emotion is subject to psychosocial factors. We hypothesized that the age of a face would bias how the emotional expressions are judged, with older faces generally more likely to be viewed as having more positive and less negative expressions than younger faces. Using two-alternative forced-choice perceptual decision tasks, participants sorted young and old faces of which emotional expressions were gradually morphed into one of two categories-"neutral vs. happy" and "neutral vs. angry." The results indicated that old faces were more frequently perceived as having a happy expression at the lower emotional intensity levels, and less frequently perceived as having an angry expression at the higher emotional intensity levels than younger faces in young adults. Critically, the perceptual decision threshold at which old faces were judged as happy was lower than for young faces, and higher for angry old faces compared to young faces. These findings suggest that the age of the face influences how its emotional expression is interpreted in social interactions.

  13. Expression level of novel tumor suppressor gene FATS is associated with the outcome of node positive breast cancer

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jun; GU Lin; ZHAO Lu-jun; ZHANG Xi-feng; QIU Li; LI Zheng

    2011-01-01

    Background Recently, we reported the identification of a previously uncharacterized and evolutionarily conserved gene, fragile-site associated tumor suppressor (FATS), at a frequently deleted region in irradiation (IR)-induced tumors.However, the role of FATS in breast cancer development and its clinical significance has not been defined. The aim of this study was to determine the role of FA7S in breast cancer development and to evaluate its clinical significance in breast cancer.Methods The expression level of FATS mRNA was determined in 106 breast carcinomas and 23 paired normal breast tissues using quantitative real time reverse transcription-polymerase chain reaction (RT-PCR). The relationship between FATS expression and clinicopathological parameters were also analyzed.Results The mRNA level of FATS was down-regulated in breast cancer compared with paired normal tissues. Low expression of FATS was correlated with high nuclear grade. There was a tendency to a favorable outcome for patients with high expression of FATS (P=0.346). However, low expression of FATS was associated with poor outcome of breast cancer patients with node positive (P=0.011). Furthermore, the mRNA level of FATS showed an independent value in predicting the outcome of breast cancer patients with positive lymph nodes.Conclusion FATS is involved in the carcinogenesis and development of breast cancer and could be a potential biomarker and prognostic factor for breast cancer therapy.

  14. The Y-located gonadoblastoma gene TSPY amplifies its own expression through a positive feedback loop in prostate cancer cells

    Energy Technology Data Exchange (ETDEWEB)

    Kido, Tatsuo; Lau, Yun-Fai Chris, E-mail: Chris.Lau@UCSF.edu

    2014-03-28

    Highlights: • Y-encoded proto-oncoprotein TSPY amplifies its expression level via a positive feedback loop. • TSPY binds to the chromatin/DNA at exon 1 of TSPY gene. • TSPY enhances the gene expression in a TSPY exon 1 sequence dependent manner. • The conserved SET/NAP-domain is essential for TSPY transactivation. • Insights on probable mechanisms on TSPY exacerbation on cancer development in men. - Abstract: The testis-specific protein Y-encoded (TSPY) is a repetitive gene located on the gonadoblastoma region of the Y chromosome, and has been considered to be the putative gene for this oncogenic locus on the male-only chromosome. It is expressed in spermatogonial cells and spermatocytes in normal human testis, but abundantly in gonadoblastoma, testicular germ cell tumors and a variety of somatic cancers, including melanoma, hepatocellular carcinoma and prostate cancer. Various studies suggest that TSPY accelerates cell proliferation and growth, and promotes tumorigenesis. In this report, we show that TSPY could bind directly to the chromatin/DNA at exon 1 of its own gene, and greatly enhance the transcriptional activities of the endogenous gene in the LNCaP prostate cancer cells. Domain mapping analyses of TSPY have localized the critical and sufficient domain to the SET/NAP-domain. These results suggest that TSPY could efficiently amplify its expression and oncogenic functions through a positive feedback loop, and contribute to the overall tumorigenic processes when it is expressed in various human cancers.

  15. Nestin-positive progenitor cells isolated from human fetal pancreas have phenotypic markers identical to mesenchymal stem cells

    Institute of Scientific and Technical Information of China (English)

    Ling Zhang; Tian-Pei Hong; Jiang Hu; Yi-Nan Liu; Yong-Hua Wu; Ling-Song Li

    2005-01-01

    AIM: To isolate nestin-positive progenitor cells from human fetal pancreas and to detect their surface markers and their capability of proliferation and differentiation into pancreatic islet endocrine cells in vitro.METHODS: Islet-like cell clusters (ICCs) were isolated from human fetal pancreas by using collagenase digestion. The free-floating ICCs were handpicked and cultured in a new dish. After the ICCs developed into monolayer epithelium-like cells, they were passaged and induced for differentiation. Reverse transcription polymerase chain reaction (RT-PCR), immunofluorescence stain, fluorescenceactivated cell sorting (FACS) and radioimmunoassay (RIA)were used to detect the expression of cell markers. RESULTS: (1) The monolayer epithelium-like cells had highly proliferative potential and could be passaged more than 16 timesin vitro; (2) RT-PCR analysis and immunofluorescence stain showed that these cells expressed both nestin and ABCG2, two of stem cellmarkers; (3) FACS analysis revealed that CD44, CD90and CD147 were positive, whereas CD34, CD38, CD45, CD71, CD117, CD133 and HLA-DR were negative on the nestin-positive cells; (4) RT-PCR analysis showed that the mRNA expression of insulin, glucagon and pancreaticduodenal homeobox gene-1 was detected, whereas the expression of nestin and neurogenin 3 disappeared in these cells treated with serum-free media supplemented with the cocktail of growth factors. Furthermore, the intracellular insulin content was detected by RIA after the induction culture.CONCLUSION: Nestin-positive cells isolated from human fetal pancreas possess the characteristics of pancreatic progenitor cells since they have highly proliferative potential and the capability of differentiation into insulinproducing cells in vitro. Interestingly, the nestin-positive pancreatic progenitor cells share many phenotypic markers with mesenchymal stem cells derived from bone marrow.

  16. JAM-A expression positively correlates with poor prognosis in breast cancer patients.

    Science.gov (United States)

    McSherry, Elaine A; McGee, Sharon F; Jirstrom, Karin; Doyle, Emma M; Brennan, Donal J; Landberg, Goran; Dervan, Peter A; Hopkins, Ann M; Gallagher, William M

    2009-09-15

    The cell-cell adhesion protein junctional adhesion molecule-A (JAM-A) influences epithelial cell morphology and migration. As migration is required for tumor cell invasion and metastasis, we sought to elucidate the role of JAM-A in invasive breast cancer. A breast cancer tissue microarray was analyzed for JAM-A protein expression, in parallel with analysis of JAM-A gene expression data from a breast cancer clinical dataset. Our data demonstrate a novel association between JAM-A gene and protein upregulation and poor prognosis in breast cancer. To mechanistically dissect this process, we used lentiviral technology to stably knock down JAM-A gene expression by shRNA in MCF7 breast cancer cells, which express high-endogenous levels of JAM-A. We also antagonized JAM-A function in wild-type MCF7 cells using an inhibitory antibody that blocks JAM-A dimerization. Knockdown or functional antagonism of JAM-A decreased breast cancer cell migration in scratch-wound assays. Reductions in beta1-integrin protein levels were observed after JAM-A-knockdown in MCF7 cells, suggesting a mechanism for reduced motility after loss of JAM-A. Consistent with this hypothesis, tissue microarray analysis of beta1-integrin protein expression in invasive breast cancer tissues revealed a trend toward high beta1-integrin protein levels being indicative of poor prognosis. Twenty-two percent of patients were observed to coexpress high levels of JAM-A and beta1-integrin protein, and MDA-MB-231 breast cells stably overexpressing JAM-A showed an increase in beta1-integrin protein expression. Our results are consistent with a previously unreported role for JAM-A overexpression as a possible mechanism contributing to progression in primary breast cancer; and a potential therapeutic target.

  17. Expression of estrogen receptor and sensitivity to endocrine therapy of MCF-7 human breast cancer cells cultured in stem cell culture in vitro%乳腺癌MCF-7细胞体外干细胞培养条件下雌激素受体表达与治疗敏感性初探

    Institute of Scientific and Technical Information of China (English)

    张斌; 张霞; 张改容; 刘越坚; 张阳

    2012-01-01

    wasdetemined using MTT essay. The data were processed with t-tesi, Chi-square test and analysis of variance, respectively Results In suspension culture as sten cells, the proportions of the CE44+ CEB4-/low and CE44+ CEB4+ phenotype cells were (1. 60±0. 08 ) % and (30. 63±4. 40) % respectively, significantly higher Ihan (0. 27 ±0. 08 ) % and (5. 59±0.88)% innormalmedium (t=-12. 10,P =0.00; t=-5.58,P =0.00). The positive expressions of Erα and Erβ were85. 27% and90. 53% innom aimed km, 69. 43% and73.20% in suspension culture, respectively, and the differences were statistically significant(x2 = 214. 64 , P = 0. 00; x2 = 303. 58 , P = 0. 00). Wife regaids to tamoxifen sensitivity, IC50 was(9. 82±0. 31 ) μmol Lin nom aimedium, and (16. 46 ±0. 50 ) μmol Lin suspension culture After the second induced differentiation, the positive expression ofER was not upregulated and the susceptibility to tEmoxifen remained low (F = 113.63, P = 0.00).C onclusion Suspension sphere with a high ratio ofCD44+ CEB4-/low cells and CE44+ CEB4+ cells can be incubated in sten cell culture in vitro, with higher positive expression ofER and lower sensitivity to tEmoxifen, which may be attributed to endocrine resistance.

  18. AMPA receptor subunits are differentially expressed in parvalbumin- and calretinin-positive neurons of the rat hippocampus.

    Science.gov (United States)

    Catania, M V; Bellomo, M; Giuffrida, R; Giuffrida, R; Stella, A M; Albanese, V

    1998-11-01

    Recent studies suggest a functional diversity of native alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate-type glutamate receptor channels (AMPARs). In several types of interneurons, AMPARs are characterized by higher Ca2+ permeability and faster kinetics than AMPARs in principal cells. We studied the expression profile of AMPAR subunits in the hippocampal parvalbumin (PV)- and calretinin (CR)-positive cells, which represent different populations of non-principal cells. To this end, non-radioactive in situ hybridization with AMPAR subunit specific cRNAs was combined with immunocytochemistry for PV or CR. Double-immunolabelling using antibodies against AMPAR subunits and PV or CR was also performed. PV-containing neurons represent a fairly homogeneous population of cells expressing high levels of GluR-A and GluR-D mRNAs, moderate levels of GluR-C and low levels of GluR-B mRNAs in all the examined regions of hippocampus. The vast majority of CR-containing cells have a much lower expression of GluR-A, -C and -D mRNA than PV-positive neurons, although similarly featuring low levels of GluR-B mRNA. Only a subpopulation of CR-containing cells, the spiny neurons of the dentate gyrus and CA3 region of the hippocampus were characterized by a strong expression of GluR-A and -D subunit mRNAs. The differential pattern found for the AMPAR subunit mRNA expression was confirmed by immunocytochemistry at protein level. Despite the common feature of low GluR-B subunit expression, PV- and CR-containing interneurons differ with respect to the density and combination of their expressed AMPAR subunits. The different combination of subunits might subserve different properties of the AMPA channels featured by these cell types, with implications for the functioning of the hippocampal network.

  19. MYB98 positively regulates a battery of synergid-expressed genes encoding filiform apparatus localized proteins.

    Science.gov (United States)

    Punwani, Jayson A; Rabiger, David S; Drews, Gary N

    2007-08-01

    The synergid cells within the female gametophyte are essential for reproduction in angiosperms. MYB98 encodes an R2R3-MYB protein required for pollen tube guidance and filiform apparatus formation by the synergid cells. To test the predicted function of MYB98 as a transcriptional regulator, we determined its subcellular localization and examined its DNA binding properties. We show that MYB98 binds to a specific DNA sequence (TAAC) and that a MYB98-green fluorescent protein fusion protein localizes to the nucleus, consistent with a role in transcriptional regulation. To identify genes regulated by MYB98, we tested previously identified synergid-expressed genes for reduced expression in myb98 female gametophytes and identified 16 such genes. We dissected the promoter of one of the downstream genes, DD11, and show that it contains a MYB98 binding site required for synergid expression, suggesting that DD11 is regulated directly by MYB98. To gain insight into the functions of the downstream genes, we chose five genes and determined the subcellular localization of the encoded proteins. We show that these five proteins are secreted into the filiform apparatus, suggesting that they play a role in either the formation or the function of this unique structure. Together, these data suggest that MYB98 functions as a transcriptional regulator in the synergid cells and activates the expression of genes required for pollen tube guidance and filiform apparatus formation.

  20. The perception of positive and negative facial expressions in unilateral brain-damaged patients: A meta-analysis.

    Science.gov (United States)

    Abbott, Jacenta D; Cumming, Geoff; Fidler, Fiona; Lindell, Annukka K

    2013-01-01

    How the brain is lateralised for emotion processing remains a key question in contemporary neuropsychological research. The right hemisphere hypothesis asserts that the right hemisphere dominates emotion processing, whereas the valence hypothesis holds that positive emotion is processed in the left hemisphere and negative emotion is controlled by the right hemisphere. A meta-analysis was conducted to assess unilateral brain-damaged individuals' performance on tasks of facial emotion perception according to valence. A systematic search of the literature identified seven articles that met the conservative selection criteria and could be included in a meta-analysis. A total of 12 meta-analyses of facial expression perception were constructed assessing identification and labelling tasks according to valence and the side of brain damage. The results demonstrated that both left and right hemisphere damage leads to impairments in emotion perception (identification and labelling) irrespective of valence. Importantly, right hemisphere damage prompted more pronounced emotion perception impairment than left hemisphere damage, across valence, suggesting right hemisphere dominance for emotion perception. Furthermore, right hemisphere damage was associated with a larger tendency for impaired perception of negative than positive emotion across identification and labelling tasks. Overall the findings support Adolphs, Jansari, and Tranel (2001) model whereby the right hemisphere preferentially processes negative facial expressions and both hemispheres process positive facial expressions.

  1. Neural activity to positive expressions predicts daily experience of schizophrenia-spectrum symptoms in adults with high social anhedonia.

    Science.gov (United States)

    Hooker, Christine I; Benson, Taylor L; Gyurak, Anett; Yin, Hong; Tully, Laura M; Lincoln, Sarah Hope

    2014-02-01

    Social anhedonia (SA), the diminished pleasure from social relationships, is a prominent characteristic of the vulnerability and manifestation of schizophrenia disorder. However, SA can develop for multiple reasons and little is known about its neural basis; these 2 issues hinder the utility and sensitivity of SA as a marker of schizophrenia pathology. This study investigated whether lateral prefrontal cortex (LPFC) deficits in social reward processing are associated with both SA and other schizophrenia-spectrum symptoms. During functional MRI (fMRI), a community sample of healthy adults (N = 30) with high and low SA viewed positive, negative, and neutral facial expressions. Afterward, participants completed an online daily diary in which they rated schizophrenia-spectrum symptoms and occurrence of interpersonal conflict each day for 21 days. Compared with low SA, high SA participants had less ventral (V)LPFC activity to positive versus neutral expressions. In addition, participants with a combination of high SA and low VLPFC activity to positive versus neutral expressions had worse daily diary ratings of schizophrenia-spectrum symptoms, including worse cognition, paranoia, motivation/productivity, and vigor/positive affect (i.e., psychomotor activation). Finally, among high SA participants, VLPFC activity predicted the daily relationship between distress from interpersonal conflict and symptom-severity; specifically, high SA participants with low VLPFC activity had worse paranoia on days of high conflict distress. These findings indicate that VLPFC deficits in positive emotion are associated with both SA and other schizophrenia-spectrum symptoms and that understanding the interaction of SA, VLPFC function, and social stress could facilitate the use of SA in the prevention and treatment of schizophrenia.

  2. Transcriptional regulator LsrB of Sinorhizobium meliloti positively regulates the expression of genes involved in lipopolysaccharide biosynthesis.

    Science.gov (United States)

    Tang, Guirong; Wang, Ying; Luo, Li

    2014-09-01

    Rhizobia induce nitrogen-fixing nodules on host legumes, which is important in agriculture and ecology. Lipopolysaccharide (LPS) produced by rhizobia is required for infection or bacteroid survival in host cells. Genes required for LPS biosynthesis have been identified in several Rhizobium species. However, the regulation of their expression is not well understood. Here, Sinorhizobium meliloti LsrB, a member of the LysR family of transcriptional regulators, was found to be involved in LPS biosynthesis by positively regulating the expression of the lrp3-lpsCDE operon. An lsrB in-frame deletion mutant displayed growth deficiency, sensitivity to the detergent sodium dodecyl sulfate, and acidic pH compared to the parent strain. This mutant produced slightly less LPS due to lower expression of the lrp3 operon. Analysis of the transcriptional start sites of the lrp3 and lpsCDE gene suggested that they constitute one operon. The expression of lsrB was positively autoregulated. The promoter region of lrp3 was specifically precipitated by anti-LsrB antibodies in vivo. The promoter DNA fragment containing TN11A motifs was bound by the purified LsrB protein in vitro. These new findings suggest that S. meliloti LsrB is associated with LPS biosynthesis, which is required for symbiotic nitrogen fixation on some ecotypes of alfalfa plants.

  3. The positive correlation between DJ-1 and β-catenin expression shows prognostic value for patients with glioma.

    Science.gov (United States)

    Wang, Chao; Fang, Mao; Zhang, Meng; Li, Weiping; Guan, Hong; Sun, Yanhua; Xie, Siming; Zhong, Xueyun

    2013-12-01

    The relationship between DJ-1 and β-catenin, and its impact on the prognosis for glioma patients has not been fully understood. This study determined the effect of DJ-1 on β-catenin and the prognostic significance of this interaction in glioma patients. We collected tumor specimens from 88 glioma patients and determined the expression of DJ-1, β-catenin and PTEN by using immunohistochemical staining. The involvement of DJ-1 and β-catenin in glioma cell lines was evaluated by immunohistochemistry and Western blotting. High DJ-1 expression (37.5%) and high β-catenin expression (34.1%) in glioma specimens were significantly associated with high grade and poor prognosis in glioma patients. However, only high levels of DJ-1 (P = 0.014) was a strong independent prognostic factor, correlated with a reduced overall survival time. In vitro DJ-1 expression was positively correlated with the expression levels of β-catenin and p-Akt, and negatively correlated with PTEN expression in U87, U251 MG, SWO-38 and SHG44 human glioma cell lines. After the knockdown of DJ-1, Akt, p-Akt or β-catenin expression levels were not affected in the PTEN-null cell lines (U87 and U251 MG). However, in the SWO-38 cell line, which has wild-type PTEN protein, the level of PTEN increased while Akt/p-Akt and β-catenin levels were reduced. Furthermore, β-catenin staining weakened in SWO-38 cells after DJ-1 levels decreased according to immunocytochemical analysis. In conclusion, DJ-1 and β-catenin may contribute to the development and recurrence of glioma and are valuable prognostic factors for glioma patients. DJ-1 may regulate β-catenin expression via PTEN and p-Akt.

  4. Positional and expressive alteration of prohibitin during the induced differentiation of human hepatocarcinoma SMMC-7721 cells

    Institute of Scientific and Technical Information of China (English)

    Dong-Hui Xu; Jian Tang; Qi-Fu Li; Song-Lin Shi; Xiang-Feng Chen; Ying Liang

    2008-01-01

    AIM: To explore the existence and distribution of prohibitin (PHB) in nuclear matrix and its co-localization with products of some related genes during the differentiation of human hepatocarcinoma SMMC-7721cells.METHODS: The nuclear matrix of the SHHC-7721 cells cultured with or without 5 x 10-3 mmol/L hexamethylene bisacetamide (HMBA) was selectively extracted.Western blot was used to analyze the expression of PHB in nuclear matrix; imrnunofluorescence microscope observation was used to analyze the distribution of PHB in cell. LCSM was used to observe the co-localization of PHB with products of oncogenes and tumor suppressor genes.RESULTS: Western blot analysis showed that PHB existed in the composition of nuclear matrix proteins and was down-regulated by HMBA treatment.Immunofluorescence observation revealed that PHB existed in the nuclear matrix, and its distribution regions and expression levels were altered after HMBA treatment. Laser scanning confocal microscopy revealed the co-localization between PHB and the products of oncogenes or tumor repression genes including c-fos, c-myc, p53 and Rb and its alteration of distributive area in the cells treated by HMBA.CONCLUSION: These data confirm that PHB is a nuclear matrix protein, which is located in the nuclear matrix, and the distribution and expression of PHB and its relation with associated genes may play significant roles during the differentiation of SMHC-7721 cells.

  5. Genome-Wide Nucleosome Occupancy and Positioning and Their Impact on Gene Expression and Evolution in Plants.

    Science.gov (United States)

    Zhang, Tao; Zhang, Wenli; Jiang, Jiming

    2015-08-01

    The fundamental unit of chromatin is the nucleosome that consists of a protein octamer composed of the four core histones (Hs; H3, H4, H2A, and H2B) wrapped by 147 bp of DNA. Nucleosome occupancy and positioning have proven to be dynamic and have a critical impact on expression, regulation, and evolution of eukaryotic genes. We developed nucleosome occupancy and positioning data sets using leaf tissue of rice (Oryza sativa) and both leaf and flower tissues of Arabidopsis (Arabidopsis thaliana). We show that model plant and animal species share the fundamental characteristics associated with nucleosome dynamics. Only 12% and 16% of the Arabidopsis and rice genomes, respectively, were occupied by well-positioned nucleosomes. The cores of positioned nucleosomes were enriched with G/C dinucleotides and showed a lower C→T mutation rate than the linker sequences. We discovered that nucleosomes associated with heterochromatic regions were more spaced with longer linkers than those in euchromatic regions in both plant species. Surprisingly, different nucleosome densities were found to be associated with chromatin in leaf and flower tissues in Arabidopsis. We show that deep MNase-seq data sets can be used to map nucleosome occupancy of specific genomic loci and reveal gene expression patterns correlated with chromatin dynamics in plant genomes.

  6. Hormonal-receptor positive breast cancer: IL-6 augments invasion and lymph node metastasis via stimulating cathepsin B expression

    Directory of Open Access Journals (Sweden)

    Sherif A. Ibrahim

    2016-09-01

    Full Text Available Hormonal-receptor positive (HRP breast cancer patients with positive metastatic axillary lymph nodes are characterized by poor prognosis and increased mortality rate. The mechanisms by which cancer cells invade lymph nodes have not yet been fully explored. Several studies have shown that expression of IL-6 and the proteolytic enzyme cathepsin B (CTSB was associated with breast cancer poor prognosis. In the present study, the effect of different concentrations of recombinant human IL-6 on the invasiveness capacity of HRP breast cancer cell line MCF-7 was tested using an in vitro invasion chamber assay. The impact of IL-6 on expression and activity of CTSB was also investigated. IL-6 treatment promoted the invasiveness potential of MCF-7 cells in a dose-dependent manner. Furthermore, MCF-7 cells displayed elevated CTSB expression and activity associated with loss of E-cadherin and upregulation of vimentin protein levels upon IL-6 stimulation. To validate these results in vivo, the level of expression of IL-6 and CTSB in the carcinoma tissues of HRP-breast cancer patients with positive and negative axillary metastatic lymph nodes (pLNs and nLNs was assessed. Western blot and immunohistochemical staining data showed that expression of IL-6 and CTSB was higher in carcinoma tissues in HRP-breast cancer with pLNs than those with nLNs patients. ELISA results showed carcinoma tissues of HRP-breast cancer with pLNs exhibited significantly elevated IL-6 protein levels by approximately 2.8-fold compared with those with nLNs patients (P < 0.05. Interestingly, a significantly positive correlation between IL-6 and CTSB expression was detected in clinical samples of HRP-breast cancer patients with pLNs (r = 0.78, P < 0.01. Collectively, this study suggests that IL-6-induced CTSB may play a role in lymph node metastasis, and that may possess future therapeutic implications for HRP-breast cancer patients with pLNs. Further studies are necessary to fully

  7. Wyckoff positions and the expression of polarization singularities in photonic crystals.

    Science.gov (United States)

    Wheeldon, Jeffrey F; Schriemer, Henry

    2009-02-16

    We reveal the fundamental relation between linear photonic crystal symmetries and the local polarization states of its Bloch modes, in particular the location and nature of polarization singularities as established by rigorous group theoretic analysis, encompassing the full system symmetry. This is illustrated with the fundamental transverse electric mode of a two-dimensional hexagonal photonic crystal, in the vanishing contrast limit and at the K point. For general Wyckoff positions within the fundamental domain, the transformation of a local polarization state is determined by the nature of the symmetry operations that map to members of its crystallographic orbit. In particular, the site symmetries that correspond to specific Wyckoff positions constrain the local polarization state to singular character--circular, linear or disclination. Moreover, through the application of a local symmetry transformation relation, and the group's character table, the precise natures of the singularities may be determined from self-consistency arguments.

  8. Oral lichen sclerosus expressing extracellular matrix proteins and IgG4-positive plasma cells.

    Science.gov (United States)

    De Aquino Xavier, Flavia Calo; Prates, Alisio Alves; Gurgel, Clarissa Araujo; De Souza, Tulio Geraldo; Andrade, Rodrigo Guimaraes; Goncalves Ramos, Eduardo Antonio; Pedreira Ramalho, Luciana Maria; Dos Santos, Jean Nunes

    2014-09-16

    Lichen sclerosus (LS) is a mucocutaneous disease with uncommon oral involvement. The etiology is not yet well understood, but LS has been associated with autoimmune, genetic, and immunological factors. We report a 47-year-old man with LS that exhibited an asymptomatic white plaque with red patches on the maxillary alveolar mucosa extending to the labial mucosa. He had no other skin disease. Positive immunostaining for tenascin and scarcity of fibronectin suggested extracellular matrix reorganization. Elastin immunostaining indicated a reduction of elastic fibers. Immunoexpression of collagen IV in blood vessels and its absence in the epithelial basement membrane, together with diffuse MMP-9 immunoexpression, suggested altered proteolytic activity. Mast cell staining bordering areas of sclerosis indicated a possible role in the synthesis of collagen. IgG4 positivity in plasma cells suggested a role in the fibrogenesis. This is an unusual presentation of oral LS and we discuss immunohistochemical findings regarding cellular and extracellular matrix components.

  9. The importance of mutual positive expressivity in social adjustment: understanding the role of peers and gender.

    Science.gov (United States)

    Sallquist, Julie; DiDonato, Matthew D; Hanish, Laura D; Martin, Carol Lynn; Fabes, Richard A

    2012-04-01

    The relations between young children's mutual (reciprocated) and overall positive emotion (PE) with same- and other-gender peers and their social adjustment were explored. Children's PE and peers' PE were observed across the preschool year during peer interactions (N = 166; 46% girls; M age = 52 months). Results revealed that girls and boys had similar frequencies of overall PE and mutual PE when interacting with same-gender peers, but girls were marginally higher compared with boys in overall and mutual PE when interacting with other-gender peers. Girls and boys did not have greater rates of either type of PE after controlling for gender segregation during same- or other-gender interactions. Using structural equation modeling, children's mutual PE, regardless of their gender, positively predicted indicators of positive adjustment (e.g., prosocial behavior, cooperation) and negatively predicted indicators of negative adjustment (e.g., hyperactivity, disruption, exclusion by peers). Children's overall PE did not predict either type of adjustment. Findings support the importance of mutual PE for children's development.

  10. Methylation of the claudin 1 promoter is associated with loss of expression in estrogen receptor positive breast cancer.

    Directory of Open Access Journals (Sweden)

    Francescopaolo Di Cello

    Full Text Available Downregulation of the tight junction protein claudin 1 is a frequent event in breast cancer and is associated with recurrence, metastasis, and reduced survival, suggesting a tumor suppressor role for this protein. Tumor suppressor genes are often epigenetically silenced in cancer. Downregulation of claudin 1 via DNA promoter methylation may thus be an important determinant in breast cancer development and progression. To investigate if silencing of claudin 1 has an epigenetic etiology in breast cancer we compared gene expression and methylation data from 217 breast cancer samples and 40 matched normal samples available through the Cancer Genome Atlas (TCGA. Moreover, we analyzed claudin 1 expression and methylation in 26 breast cancer cell lines. We found that methylation of the claudin 1 promoter CpG island is relatively frequent in estrogen receptor positive (ER+ breast cancer and is associated with low claudin 1 expression. In contrast, the claudin 1 promoter was not methylated in most of the ER-breast cancers samples and some of these tumors overexpress claudin 1. In addition, we observed that the demethylating agents, azacitidine and decitabine can upregulate claudin 1 expression in breast cancer cell lines that have a methylated claudin 1 promoter. Taken together, our results indicate that DNA promoter methylation is causally associated with downregulation of claudin 1 in a subgroup of breast cancer that includes mostly ER+ tumors, and suggest that epigenetic therapy to restore claudin 1 expression might represent a viable therapeutic strategy in this subtype of breast cancer.

  11. Children's expressions of positive emotion are sustained by smiling, touching, and playing with parents and siblings: A naturalistic observational study of family life.

    Science.gov (United States)

    Bai, Sunhye; Repetti, Rena L; Sperling, Jacqueline B

    2016-01-01

    Research on family socialization of positive emotion has primarily focused on the infant and toddler stages of development, and relied on observations of parent-child interactions in highly structured laboratory environments. Little is known about how children's spontaneous expressions of positive emotion are maintained in the uncontrolled settings of daily life, particularly within the family and during the school-age years. This naturalistic observational study examines 3 family behaviors-mutual display of positive emotion, touch, and joint leisure-that surround 8- to 12-year-old children's spontaneous expressions of positive emotion, and tests whether these behaviors help to sustain children's expressions. Recordings taken of 31 families in their homes and communities over 2 days were screened for moments when children spontaneously expressed positive emotion in the presence of at least 1 parent. Children were more likely to sustain their expressions of positive emotion when mothers, fathers, or siblings showed positive emotion, touched, or participated in a leisure activity. There were few differences in the ways that mothers and fathers socialized their sons' and daughters' positive emotion expressions. This study takes a unique, ecologically valid approach to assess how family members connect to children's expressions of positive emotion in middle childhood. Future observational studies should continue to explore mechanisms of family socialization of positive emotion, in laboratory and naturalistic settings. (PsycINFO Database Record

  12. Increased expression of virulence attributes in oral Candida albicans isolates from human immunodeficiency virus-positive individuals.

    Science.gov (United States)

    Mane, Arati; Gaikwad, Shraddha; Bembalkar, Shilpa; Risbud, Arun

    2012-02-01

    Oral candidiasis caused by Candida albicans is recognized as one of the most frequent opportunistic infections in human immunodeficiency virus (HIV)-infected individuals. The overall severity and chronicity of oral candidiasis has been attributed exclusively to the HIV-induced immune deficiency of the affected individuals but not to the virulence factors of the pathogen, i.e. C. albicans. However, genotypic and phenotypic studies have suggested that HIV infection might be associated with preferential selection of C. albicans strains with altered virulence determinants, leading to colonization with Candida populations that are better able to cause disease in these immunologically compromised hosts. If this process of selection is indeed related to pathogenicity, it may be possible to measure alterations in different virulence factors produced by C. albicans in HIV-infected patients. To evaluate this hypothesis, the present work was undertaken to determine simultaneously the expression of five virulence factors in oral C. albicans isolates colonizing and infecting HIV-positive and -negative individuals. The significance of genotypes in the pathogenesis of oral candidiasis was also elucidated. Oral swabs were collected from 335 consecutive individuals (210 HIV-positive and 125 HIV-negative). Virulence factors and genotypes were determined for all the C. albicans strains isolated. The results showed significantly increased expression of proteinase, phospholipase and haemolytic activities, as well as a greater ability to adhere, in isolates from HIV-positive compared with HIV-negative individuals (Pvirulence factor expression in isolates colonizing or infecting HIV-positive individuals were seen. Genotype A was the predominant type (71.3 %); however, a relationship could not be established between the genotypes and the virulence factors, or with clinical infection. These data support the concept of preferential C. albicans strain selection with altered virulence

  13. Expression profiles of key phenylpropanoid genes during Vanilla planifolia pod development reveal a positive correlation between PAL gene expression and vanillin biosynthesis.

    Science.gov (United States)

    Fock-Bastide, Isabelle; Palama, Tony Lionel; Bory, Séverine; Lécolier, Aurélie; Noirot, Michel; Joët, Thierry

    2014-01-01

    In Vanilla planifolia pods, development of flavor precursors is dependent on the phenylpropanoid pathway. The distinctive vanilla aroma is produced by numerous phenolic compounds of which vanillin is the most important. Because of the economic importance of vanilla, vanillin biosynthetic pathways have been extensively studied but agreement has not yet been reached on the processes leading to its accumulation. In order to explore the transcriptional control exerted on these pathways, five key phenylpropanoid genes expressed during pod development were identified and their mRNA accumulation profiles were evaluated during pod development and maturation using quantitative real-time PCR. As a prerequisite for expression analysis using qRT-PCR, five potential reference genes were tested, and two genes encoding Actin and EF1 were shown to be the most stable reference genes for accurate normalization during pod development. For the first time, genes encoding a phenylalanine ammonia-lyase (VpPAL1) and a cinnamate 4-hydroxylase (VpC4H1) were identified in vanilla pods and studied during maturation. Among phenylpropanoid genes, differential regulation was observed from 3 to 8 months after pollination. VpPAL1 was gradually up-regulated, reaching the maximum expression level at maturity. In contrast, genes encoding 4HBS, C4H, OMT2 and OMT3 did not show significant increase in expression levels after the fourth month post-pollination. Expression profiling of these key phenylpropanoid genes is also discussed in light of accumulation patterns for key phenolic compounds. Interestingly, VpPAL1 gene expression was shown to be positively correlated to maturation and vanillin accumulation.

  14. Koenimbin, a natural dietary compound of Murraya koenigii (L Spreng: inhibition of MCF7 breast cancer cells and targeting of derived MCF7 breast cancer stem cells (CD44+/CD24-/low: an in vitro study

    Directory of Open Access Journals (Sweden)

    Ahmadipour F

    2015-02-01

    Full Text Available Fatemeh Ahmadipour,1 Mohamed Ibrahim Noordin,1 Syam Mohan,2 Aditya Arya,1 Mohammadjavad Paydar,3 Chung Yeng Looi,3 Yeap Swee Keong,4 Ebrahimi Nigjeh Siyamak,4 Somayeh Fani,1 Maryam Firoozi,5 Chung Lip Yong,1 Mohamed Aspollah Sukari,6 Behnam Kamalidehghan1 1Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia; 2Medical Research Center, Jazan University, Jazan, Kingdom of Saudi Arabia; 3Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia; 4UPM-MAKNA Cancer Research Laboratory, Institute of Bioscience, Universiti Putra Malaysia, Serdang, Malaysia; 5Department of Medical Genetics, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran; 6Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang, Malaysia Background: Inhibition of breast cancer stem cells has been shown to be an effective therapeutic strategy for cancer prevention. The aims of this work were to evaluate the efficacy of koenimbin, isolated from Murraya koenigii (L Spreng, in the inhibition of MCF7 breast cancer cells and to target MCF7 breast cancer stem cells through apoptosis in vitro. Methods: Koenimbin-induced cell viability was evaluated using the MTT (3-(4,5-dimethylthiazol-2-yl-2,5-diphenyltetrazolium bromide assay. Nuclear condensation, cell permeability, mitochondrial membrane potential, and cytochrome c release were observed using high-content screening. Cell cycle arrest was examined using flow cytometry, while human apoptosis proteome profiler assays were used to investigate the mechanism of apoptosis. Protein expression levels of Bax, Bcl2, and heat shock protein 70 were confirmed using Western blotting. Caspase-7, caspase-8, and caspase-9 levels were measured, and nuclear factor kappa B (NF-κB activity was assessed using a high-content screening assay. Aldefluor™ and mammosphere formation assays were used to evaluate the effect of koenimbin on MCF7

  15. Expression of Castor LPAT2 Enhances Ricinoleic Acid Content at the sn-2 Position of Triacylglycerols in Lesquerella Seed

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    Grace Q. Chen

    2016-04-01

    Full Text Available Lesquerella is a potential industrial oilseed crop that makes hydroxy fatty acid (HFA. Unlike castor its seeds are not poisonous but accumulate lesquerolic acid mostly at the sn-1 and sn-3 positions of triacylglycerol (TAG, whereas castor contains ricinoleic acid (18:1OH at all three positions. To investigate whether lesquerella can be engineered to accumulate HFAs in the sn-2 position, multiple transgenic lines were made that express castor lysophosphatidic acid acyltransferase 2 (RcLPAT2 in the seed. RcLPAT2 increased 18:1OH at the sn-2 position of TAGs from 2% to 14%–17%, which resulted in an increase of tri-HFA-TAGs from 5% to 13%–14%. Our result is the first example of using a LPAT to increase ricinoleic acid at the sn-2 position of seed TAG. This work provides insights to the mechanism of HFA-containing TAG assembly in lesquerella and directs future research to optimize this plant for HFA production.

  16. Extensive evolutionary changes in regulatory element activity during human origins are associated with altered gene expression and positive selection.

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    Yoichiro Shibata

    2012-06-01

    Full Text Available Understanding the molecular basis for phenotypic differences between humans and other primates remains an outstanding challenge. Mutations in non-coding regulatory DNA that alter gene expression have been hypothesized as a key driver of these phenotypic differences. This has been supported by differential gene expression analyses in general, but not by the identification of specific regulatory elements responsible for changes in transcription and phenotype. To identify the genetic source of regulatory differences, we mapped DNaseI hypersensitive (DHS sites, which mark all types of active gene regulatory elements, genome-wide in the same cell type isolated from human, chimpanzee, and macaque. Most DHS sites were conserved among all three species, as expected based on their central role in regulating transcription. However, we found evidence that several hundred DHS sites were gained or lost on the lineages leading to modern human and chimpanzee. Species-specific DHS site gains are enriched near differentially expressed genes, are positively correlated with increased transcription, show evidence of branch-specific positive selection, and overlap with active chromatin marks. Species-specific sequence differences in transcription factor motifs found within these DHS sites are linked with species-specific changes in chromatin accessibility. Together, these indicate that the regulatory elements identified here are genetic contributors to transcriptional and phenotypic differences among primate species.

  17. Oct4 B1在结直肠癌干细胞中的表达及意义%Expression and significance of Oct4 B1 in colorectal cancer stem cells

    Institute of Scientific and Technical Information of China (English)

    程家平; 黎江; 苏弦; 陈奕霖; 曾庆良; 坤明

    2016-01-01

    Objective:To investigate the expression and its possible role of Oct4B1 subtype of Embryonic stem cell transcription factor Oct4 in colorectal cancer stem cells. Methods: 3D microspheres were cultured by suspension culture to human colorectal cancer cell line SW480 cells. The 3D microspheres and SW480 cells were used as the research objects. Whether 3D microspheres were enriched cancer stem cells,we used the methods of cell differentiation experiments,soft agar cloning experiments,and the expression levels of cancer stem cells markers CD133,CD44 detected by flow cytometry. The expression levels of Oct4B1 mRNA were detected by RT-qPCR. Results:3D microspheres could differentiate into normal cancer cells. Compared with the parental SW480 cells,in vitro colony formation was significantly enhanced(P<0. 01),the percentage of positive cells of CD133 and CD44 were significantly increased ( P < 0. 01 ), the expression levels of Oct4B1 mRNA were obviously higher ( P < 0. 01 ) in 3D microspheres. Conclusion: Oct4B1 subtype of Embryonic stem cell transcription factor Oct4 in 3D microspheres enriched human colorectal cancer stem cells,which may be involved in the regulation of colorectal cancer stem cells.%目的:探讨胚胎干细胞转录因子Oct4的亚型Oct4B1在结直肠癌干细胞中的表达及其可能的作用。方法:以结直肠癌细胞株SW480细胞采用悬浮培养法培养出的3D微球体及其亲本细胞SW480为研究对象,采用细胞分化实验、细胞软琼脂克隆实验、流式细胞技术检测干细胞标记物CD133、CD44的表达以验证3D微球体是否富集肿瘤干细胞(CSCs),实时荧光定量PCR(RT-qPCR)检测两种细胞Oct4B1 mRNA表达水平。结果:3D微球体具有分化为普通肿瘤细胞的能力,相对于亲本细胞,3D微球体体外克隆形成能力明显增强(P<0.01),干细胞标记物CD133、CD44明显高表达(P<0.01),Oct4B1 mRNA表达水平明显增高(P<0.01)。结

  18. Characteristic expression of HTLV-1 basic zipper factor (HBZ transcripts in HTLV-1 provirus-positive cells

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    Yamada Yasuaki

    2008-04-01

    Full Text Available Abstract Background HTLV-1 causes adult T-cell leukemia (ATL. Although there have been many studies on the oncogenesis of the viral protein Tax, the precise oncogenic mechanism remains to be elucidated. Recently, a new viral factor, HTLV-1 basic Zip factor (HBZ, encoded from the minus strand mRNA was discovered and the current models of Tax-centered ATL cell pathogenesis are in conflict with this discovery. HBZs consisting of non-spliced and spliced isoforms (HBZ-SI are thought to be implicated in viral replication and T-cell proliferation but there is little evidence on the HBZ expression profile on a large scale. Results To investigate the role of HBZ-SI in HTLV-1 provirus-positive cells, the HBZ-SI and Tax mRNA loads in samples with a mixture of infected and non-infected cells were measured and then adjusted by dividing by the HTLV-I proviral load. We show here that the HBZ-SI mRNA level is 4-fold higher than non-spliced HBZ and is expressed by almost all cells harboring HTLV-1 provirus with variable intensity. The proviral-adjusted HBZ-SI and Tax quantification revealed a characteristic imbalanced expression feature of high HBZ and low Tax expression levels in primary ATL cells or high HBZ and very high Tax levels in HTLV-1-related cell lines (cell lines compared with a standard expression profile of low HBZ and low Tax in infected cells. Interestingly, according to the mutual Tax and HBZ expression status, HTLV-1-related cell lines were subcategorized into two groups, an ATL cell type with high HBZ and low Tax levels and another type with high Tax and either high or low HBZ, which was closely related to its cell origin. Conclusion This is the first comprehensive study to evaluate the mutual expression profile of HBZ and Tax in provirus-positive cells, revealing that there are quantitative and relative characteristic features among infected cells, primary ATL cells, and cell lines.

  19. Expansion of PD-1-positive effector CD4 T cells in an experimental model of SLE: contribution to the self-organized criticality theory.

    Science.gov (United States)

    Miyazaki, Yumi; Tsumiyama, Ken; Yamane, Takashi; Ito, Mitsuhiro; Shiozawa, Shunichi

    2013-04-18

    We have developed a systems biology concept to explain the origin of systemic autoimmunity. From our studies of systemic lupus erythematosus (SLE) we have concluded that this disease is the inevitable consequence of over-stimulating the host's immune system by repeated exposure to antigen to levels that surpass a critical threshold, which we term the system's "self-organized criticality". We observed that overstimulation of CD4 T cells in mice led to the development of autoantibody-inducing CD4 T cells (aiCD4 T) capable of generating various autoantibodies and pathological lesions identical to those observed in SLE. We show here that this is accompanied by the significant expansion of a novel population of effector T cells characterized by expression of programmed death-1 (PD-1)-positive, CD27(low), CD127(low), CCR7(low) and CD44(high)CD62L(low) markers, as well as increased production of IL-2 and IL-6. In addition, repeated immunization caused the expansion of CD8 T cells into fully-matured cytotoxic T lymphocytes (CTL) that express Ly6C(high)CD122(high) effector and memory markers. Thus, overstimulation with antigen leads to the expansion of a novel effector CD4 T cell population that expresses an unusual memory marker, PD-1, and that may contribute to the pathogenesis of SLE.

  20. A STUDY OF MULTI-GENE EXPRESSION IN THE HIGHLY METASTASIZING HUMAN OVARIAN CANCER CELL LINE HO-8910PM AND ITS MOTHER CELL LINE HO-8910

    Institute of Scientific and Technical Information of China (English)

    Ni Xinghao; Xu Shenhua; Wu Xiongwei; Zhang Gu; Qian Lijuan; Gao Yongliang

    1998-01-01

    Objective: To investigate multi-gene expression in the highly metastasizing human ovarian cancer cell line HO8910PM and its mother cell line HO-8910. Method: The expression of 9 kinds of gene products in HO-8910PM and its mother cell line HO-8910 was detected by S-P immunohistochemical method. Result: Eight kinds oncogene products showed various degrees of positive expression in both HO-8910PM and HO-8910 cell lines except gene bax. The expression of P53, Cyclin D1, CD44v6 and EGFR in HO-8910PM was stronger than that in HO-8910. However, the expression of P16, nm23 in HO8910PM was weaker than that in HO-8910. There was no significant difference on the expression of C-erbB-2 and bcl-2 between the two cell lines. Conclusion: Stronger invasive and metastatic patential is found in HO-8910PM than that in HO-8910. Carcinogenesis is a result of multioncogene and multiple step process cooperation.

  1. Stronger T cell immunogenicity of ovalbumin expressed intracellularly in Gram-negative than in Gram-positive bacteria.

    Science.gov (United States)

    Martner, Anna; Ostman, Sofia; Lundin, Samuel; Rask, Carola; Björnsson, Viktor; Telemo, Esbjörn; Collins, L Vincent; Axelsson, Lars; Wold, Agnes E

    2013-01-01

    This study aimed to clarify whether Gram-positive (G+) and Gram-negative (G-) bacteria affect antigen-presenting cells differently and thereby influence the immunogenicity of proteins they express. Lactobacilli, lactococci and Escherichia coli strains were transformed with plasmids conferring intracellular ovalbumin (OVA) production. Murine splenic antigen presenting cells (APCs) were pulsed with washed and UV-inactivated OVA-producing bacteria, control bacteria, or soluble OVA. The ability of the APCs to activate OVA-specific DO11.10 CD4(+) T cells was assessed by measurments of T cell proliferation and cytokine (IFN-γ, IL-13, IL-17, IL-10) production. OVA expressed within E. coli was strongly immunogenic, since 500 times higher concentrations of soluble OVA were needed to achieve a similar level of OVA-specific T cell proliferation. Furthermore, T cells responding to soluble OVA produced mainly IL-13, while T cells responding to E. coli-expressed OVA produced high levels of both IFN-γ and IL-13. Compared to E. coli, G+ lactobacilli and lactococci were poor inducers of OVA-specific T cell proliferation and cytokine production, despite efficient intracellular expression and production of OVA and despite being efficiently phagocytosed. These results demonstrate a pronounced difference in immunogenicity of intracellular antigens in G+ and G- bacteria and may be relevant for the use of bacterial carriers in vaccine development.

  2. Berberine regulates peroxisome proliferator-activated receptors and positive transcription elongation factor b expression in diabetic adipocytes.

    Science.gov (United States)

    Zhou, Jiyin; Zhou, Shiwen

    2010-12-15

    Berberine has hypoglycemic and hypolipidemic effects on diabetic rats. This study investigated the relationship between hypoglycemic and hypolipidemic effects of berberine and peroxisome proliferator-activated receptors (PPARs) and positive transcription elongation factor b (P-TEFb) (including cyclin-dependent kinase 9 (CDK9) and cyclin T1) in white adipose tissue of diabetic rats and RNA interference-treated 3T3-L1 cells. Berberine promoted differentiation and inhibited lipid accumulation of 3T3-L1 cells, further decreased PPARα/δ/γ, CDK9 and cyclin T1 mRNA and protein expression and decreased tumor necrosis factor α content in supernatants of both control and RNA interference-treated 3T3-L1 cells. After a 16-week induction with 35 mg/kg streptozotocin (i.p.) and high-carbohydrate/high-fat diet, diabetic rats were treated with 75, 150 and 300 mg/kg berberine and 100 mg/kg fenofibrate or 4 mg/kg rosiglitazone for another 16 weeks. Berberine decreased white adipose tissue to body weight ratio and adipocyte size and increased adipocyte number. Berberine upregulated PPARα/δ/γ, CDK9 and cyclin T1 mRNA and protein expression in adipose tissue, decreased tumor necrosis factor α and free fatty acid content and increased lipoprotein lipase activity in serum and adipose tissue. Berberine modulated metabolic related PPARs expression and differentiation related P-TEFb expression in adipocytes, which are associated with its hypoglycemic and hypolipidemic effects.

  3. The GATA1-HS2 enhancer allows persistent and position-independent expression of a β-globin transgene.

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    Annarita Miccio

    Full Text Available Gene therapy of genetic diseases requires persistent and position-independent expression of a therapeutic transgene. Transcriptional enhancers binding chromatin-remodeling and modifying complexes may play a role in shielding transgenes from repressive chromatin effects. We tested the activity of the HS2 enhancer of the GATA1 gene in protecting the expression of a β-globin minigene delivered by a lentiviral vector in hematopoietic stem/progenitor cells. Gene expression from proviruses carrying GATA1-HS2 in both LTRs was persistent and resistant to silencing at most integration sites in the in vivo progeny of human hematopoietic progenitors and murine long-term repopulating stem cells. The GATA1-HS2-modified vector allowed correction of murine β-thalassemia at low copy number without inducing clonal selection of erythroblastic progenitors. Chromatin immunoprecipitation studies showed that GATA1 and the CBP acetyltransferase bind to GATA1-HS2, significantly increasing CBP-specific histone acetylations at the LTRs and β-globin promoter. Recruitment of CBP by the LTRs thus establishes an open chromatin domain encompassing the entire provirus, and increases the therapeutic efficacy of β-globin gene transfer by reducing expression variegation and epigenetic silencing.

  4. Chitinase expression in Listeria monocytogenes is positively regulated by the Agr system.

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    Dafni Katerina Paspaliari

    Full Text Available The food-borne pathogen Listeria monocytogenes encodes two chitinases, ChiA and ChiB, which allow the bacterium to hydrolyze chitin, the second most abundant polysaccharide in nature. Intriguingly, despite the absence of chitin in human and mammalian hosts, both of the chitinases have been deemed important for infection, through a mechanism that, at least in the case of ChiA, involves modulation of host immune responses. In this study, we show that the expression of the two chitinases is subject to regulation by the listerial agr system, a homologue of the agr quorum-sensing system of Staphylococcus aureus, that has so far been implicated in virulence and biofilm formation. We demonstrate that in addition to these roles, the listerial agr system is required for efficient chitin hydrolysis, as deletion of agrD, encoding the putative precursor of the agr autoinducer, dramatically decreased chitinolytic activity on agar plates. Agr was specifically induced in response to chitin addition in stationary phase and agrD was found to regulate the amount of chiA, but not chiB, transcripts. Although the transcript levels of chiB did not depend on agrD, the extracellular protein levels of both chitinases were reduced in the ΔagrD mutant. The regulatory effect of agr on chiA is potentially mediated through the small RNA LhrA, which we show here to be negatively regulated by agr. LhrA is in turn known to repress chiA translation by binding to the chiA transcript and interfering with ribosome recruitment. Our results highlight a previously unrecognized role of the agr system and suggest that autoinducer-based regulation of chitinolytic systems may be more commonplace than previously thought.

  5. Identification of uPAR-positive chemoresistant cells in small cell lung cancer.

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    Margarita Gutova

    Full Text Available BACKGROUND: The urokinase plasminogen activator (uPA and its receptor (uPAR/CD87 are major regulators of extracellular matrix degradation and are involved in cell migration and invasion under physiological and pathological conditions. The uPA/uPAR system has been of great interest in cancer research because it is involved in the development of most invasive cancer phenotypes and is a strong predictor of poor patient survival. However, little is known about the role of uPA/uPAR in small cell lung cancer (SCLC, the most aggressive type of lung cancer. We therefore determined whether uPA and uPAR are involved in generation of drug resistant SCLC cell phenotype. METHODS AND FINDINGS: We screened six human SCLC cell lines for surface markers for putative stem and cancer cells. We used fluorescence-activated cell sorting (FACS, fluorescence microscopy and clonogenic assays to demonstrate uPAR expression in a subpopulation of cells derived from primary and metastatic SCLC cell lines. Cytotoxic assays were used to determine the sensitivity of uPAR-positive and uPAR-negative cells to chemotherapeutic agents. The uPAR-positive cells in all SCLC lines demonstrated multi-drug resistance, high clonogenic activity and co-expression of CD44 and MDR1, putative cancer stem cell markers. CONCLUSIONS: These data suggest that uPAR-positive cells may define a functionally important population of cancer cells in SCLC, which are resistant to traditional chemotherapies, and could serve as critical targets for more effective therapeutic interventions in SCLC.

  6. Epstein-Barr virus-positive nodal peripheral T cell lymphomas: clinicopathologic and gene expression profiling study.

    Science.gov (United States)

    Ha, Sang Yun; Sung, Jiyeon; Ju, Hyunjung; Karube, Kennosuke; Kim, Soek Jin; Kim, Won Seog; Seto, Masao; Ko, Young-Hyeh

    2013-07-01

    Epstein-Barr virus-positive peripheral T cell lymphoma, not otherwise specified (EBV+ PTCL-NOS), in which virtually all neoplastic T cells harbor EBV, is a very rare disease with poor prognosis. To analyze the clinicopathologic characteristics and gene expression profile, we retrospectively collected six cases of EBV+ PTCL-NOS with no known primary immunodeficiency. The patients were 5 men and 1 woman, their age ranging from 48 years to 88 years (median 61.5 years). Lymphadenopathy was the most common presentation. Four patients had underlying disease, including HBV carrier, HCV infection, diabetes mellitus, and prostate cancer. All patients showed fatal clinical course in spite of chemotherapy. Histopathologically, monotonous infiltration of atypical lymphocytes of small to medium size was shown in four patients and medium to large tumor cells in two patients. Five patients showed CD4-/CD8+/bF-1+ phenotype with TIA-1 expression. In gene expression analysis using mRNA microarray, genes differentially expressed in EBV+ PTCL-NOS compared to normal reactive lymph nodes included 1515 genes (Mann-Whitney U-test pgenes involved in B cell differentiation or activation were mostly down-regulated, and T cell activation was mostly suppressed by down-regulation of activation genes and up-regulation of regulatory genes. Genes associated with cytotoxic activity were mostly up-regulated. Based on its peculiar clinical, histopathologic, and gene expression findings in EBV+ PTCL-NOS, we suggest EBV+ PTCL-NOS as a distinct disease entity from PTCL-NOS. In this study, the finding that most significantly enriched the functional term was immune response, suggesting a specific relation between EBV infection and alteration of immune response in the patients with EBV+ PTCL-NOS.

  7. Reduced sensitivity to both positive and negative reinforcement in mice over-expressing the 5-hydroxytryptamine transporter.

    Science.gov (United States)

    Line, Samantha J; Barkus, Chris; Rawlings, Nancy; Jennings, Katie; McHugh, Stephen; Sharp, Trevor; Bannerman, David M

    2014-12-01

    The 5-hydroxytryptamine (5-HT) transporter (5-HTT) is believed to play a key role in both normal and pathological psychological states. Much previous data suggest that the s allele of the polymorphic regulatory region of the 5-HTT gene promoter is associated with reduced 5-HTT expression and vulnerability to psychiatric disorders, including anxiety and depression. In comparison, the l allele, which increases 5-HTT expression, is generally considered protective. However, recent data link this allele to both abnormal 5-HT signalling and psychopathic traits. Here, we studied the processing of aversive and rewarding cues in transgenic mice that over-express the 5-HTT (5-HTTOE mice). Compared with wild-type mice, 5-HTTOE mice froze less in response to both a tone that had previously been paired with footshock, and the conditioning context. In addition, on a decision-making T-maze task, 5-HTTOE mice displayed reduced preference for a larger, delayed reward and increased preference for a smaller, immediate reward, suggesting increased impulsiveness compared with wild-type mice. However, further inspection of the data revealed that 5-HTTOE mice displayed a relative insensitivity to reward magnitude, irrespective of delay. In contrast, 5-HTTOE mice appeared normal on tests of spatial working and reference memory, which required an absolute choice between options associated with either reward or no reward. Overall, the present findings suggest that 5-HTT over-expression results in a reduced sensitivity to both positive and negative reinforcers. Thus, these data show that increased 5-HTT expression has some maladaptive effects, supporting recent suggestions that l allele homozygosity may be a potential risk factor for disabling psychiatric traits.

  8. Inhibition of miR-146b expression increases radioiodine-sensitivity in poorly differential thyroid carcinoma via positively regulating NIS expression

    Energy Technology Data Exchange (ETDEWEB)

    Li, Luchuan; Lv, Bin; Chen, Bo [Department of General Surgery, Shandong University Qilu Hospital, Jinan, Shandong 250012 (China); Guan, Ming [Department of General Surgery, Qihe People' s Hospital, Qihe, Shandong 251100 (China); Sun, Yongfeng [Department of General Surgery, Licheng District People' s Hospital, Jinan, Shandong 250115 (China); Li, Haipeng [Department of General Surgery, Caoxian People' s Hospital, Caoxian, Shandong 274400 (China); Zhang, Binbin; Ding, Changyuan; He, Shan [Department of General Surgery, Shandong University Qilu Hospital, Jinan, Shandong 250012 (China); Zeng, Qingdong, E-mail: qingdz0201@163.com [Department of General Surgery, Shandong University Qilu Hospital, Jinan, Shandong 250012 (China)

    2015-07-10

    Dedifferentiated thyroid carcinoma (DTC) with the loss of radioiodine uptake (RAIU) is often observed in clinical practice under radioiodine therapy, indicating the challenge for poor prognosis. MicroRNA (miRNA) has emerged as a promising therapeutic target in many diseases; yet, the role of miRNAs in RAIU has not been generally investigated. Based on recent studies about miRNA expression in papillary or follicular thyroid carcinomas, the expression profiles of several thyroid relative miRNAs were investigated in one DTC cell line, derived from normal DTC cells by radioiodine treatment. The top candidate miR-146b, with the most significant overexpression profiles in dedifferentiated cells, was picked up. Further research found that miR-146b could be negatively regulated by histone deacetylase 3 (HDAC3) in normal cells, indicating the correlation between miR-146b and Na{sup +}/I{sup −} symporter (NIS)-mediated RAIU. Fortunately, it was confirmed that miR-146b could regulate NIS expression/activity; what is more important, miR-146b interference would contribute to the recovery of radioiodine-sensitivity in dedifferentiated cells via positively regulating NIS. In the present study, it was concluded that NIS-mediated RAIU could be modulated by miR-146b; accordingly, miR-146b might serve as one of targets to enhance efficacy of radioactive therapy against poorly differential thyroid carcinoma (PDTC). - Highlights: • Significant upregulated miR-146b was picked up from thyroid relative miRNAs in DTC. • MiR-146b was negatively regulated by HDAC3 in normal thyroid carcinoma cells. • NIS activity and expression could be regulated by miR-146b in thyroid carcinoma. • MiR-146b inhibition could recover the decreased radioiodine-sensitivity of DTC cells.

  9. EXPRESSION OF VESICULAR GLUTAMATE TRANSPORTERS IN TRANSIENT RECEPTOR POTENTIAL MELASTATIN 8 (TRPM8)-POSITIVE DENTAL AFFERENTS IN THE MOUSE

    Science.gov (United States)

    Kim, Y. S.; Kim, T. H.; Mckemy, D. D.; Bae, Y. C.

    2017-01-01

    Transient receptor potential melastatin 8 (TRPM8) is activated by innocuous cool and noxious cold and plays a crucial role in cold-induced acute pain and pain hypersensitivity. To help understand the mechanism of TRPM8-mediated cold perception under normal and pathologic conditions, we used light microscopic immunohistochemistry and Western blot analysis in mice expressing a genetically encoded axonal tracer in TRPM8-positive (+) neurons. We investigated the coexpression of TRPM8 and vesicular glutamate transporter 1 (VGLUT1) and VGLUT2 in the trigeminal ganglion (TG) and the dental pulp before and after inducing pulpal inflammation. Many TRPM8+ neurons in the TG and axons in the dental pulp expressed VGLUT2, while none expressed VGLUT1. TRPM8+ axons were dense in the pulp horn and peripheral pulp and also frequently observed in the dentinal tubules. Following pulpal inflammation, the proportion of VGLUT2+ and of VGLUT2+/TRPM8+ neurons increased significantly, whereas that of TRPM8+ neurons remained unchanged. Our findings suggest the existence of VGLUT2 (but not VGLUT1)-mediated glutamate signaling in TRPM8+ neurons possibly underlying the cold-induced acute pain and hypersensitivity to cold following pulpal inflammation. PMID:26166724

  10. POSITIVE EXPRESSIVE SPEECH ACTS COMPLIMENTING AND SELF - COMPLI MENTING IN THE NOVEL CIOCOII VECHI Ș I NOI

    Directory of Open Access Journals (Sweden)

    Roxana - Florentina FLUERAȘU

    2015-11-01

    Full Text Available The present paper aims at analysing some specific aspects regarding the functioning of compliment and self - compliment - speec h acts belonging to the category of positively perceived expressives - in a literary text, Nicolae Filimon‟s novel “ Ciocoii vechi şi noi ” 1 . The purpose of the paper is to highlight the role of these subtypes of speech acts in contouring a human typology cha racterized by a specific relational system. The following parameters are taken into account: the environment in which the speech acts are produced, the target addressees, the object of the speech acts (concrete or abstract, moral or physical features of th e addressee and the value ( inherently positive or attributed by the speaker of the elements that mark the illocutionary force as positive. In the novel under consideration, there is a dichotomy between the characters with high moral qualities and the par venus – a social type definitory for the Phanariot times. Author‟s intention is to emphasize the victory of good and healthy moral principles.

  11. Correction: The role of coupled positive feedback in the expression of the SPI1 type three secretion system in Salmonella.

    Directory of Open Access Journals (Sweden)

    Supreet Saini

    Full Text Available Salmonella enterica serovar Typhimurium is a common food-borne pathogen that induces inflammatory diarrhea and invades intestinal epithelial cells using a type three secretion system (T3SS encoded within Salmonella pathogenicity island 1 (SPI1. The genes encoding the SPI1 T3SS are tightly regulated by a network of interacting transcriptional regulators involving three coupled positive feedback loops. While the core architecture of the SPI1 gene circuit has been determined, the relative roles of these interacting regulators and associated feedback loops are still unknown. To determine the function of this circuit, we measured gene expression dynamics at both population and single-cell resolution in a number of SPI1 regulatory mutants. Using these data, we constructed a mathematical model of the SPI1 gene circuit. Analysis of the model predicted that the circuit serves two functions. The first is to place a threshold on SPI1 activation, ensuring that the genes encoding the T3SS are expressed only in response to the appropriate combination of environmental and cellular cues. The second is to amplify SPI1 gene expression. To experimentally test these predictions, we rewired the SPI1 genetic circuit by changing its regulatory architecture. This enabled us to directly test our predictions regarding the function of the circuit by varying the strength and dynamics of the activating signal. Collectively, our experimental and computational results enable us to deconstruct this complex circuit and determine the role of its individual components in regulating SPI1 gene expression dynamics.

  12. Effect of herceptin combined with second-line therapy paclitaxel + S-1 on malignant degree and angiogenesis in patients with HER-2-positive gastric cancer

    Institute of Scientific and Technical Information of China (English)

    Lei-Fan Li; Xiu-Yun Wang; Hui-Qiong Xu; Xia Liu

    2016-01-01

    Objective:To analyze the effect of herceptin combined with second-line therapy paclitaxel + S-1 on the malignant degree and angiogenesis in patients with HER-2-positive gastric cancer.Methods: A total of 90 patients with HER-2-positive gastric cancer were randomly divided into observation group and control group (n=45), control group received paclitaxel + S-1 chemotherapy, observation group received herceptin combined with paclitaxel + S-1 chemotherapy, and differences in the content of tumor markers and angiogenesis indexes in serum as well as mRNA expression levels of apoptosis and invasion genes in tumor biopsy specimens were compared between two groups of patients after 4 cycles of treatment.Results:CA19-9, CEA, CA242, CA724 and AFP content in serum of observation group were lower than those of control group; VEGF, bFGF, Ang-2 and IGF-Ⅱ content in serum were lower than those of control group while PEDF and ES content were higher than those of control group; apoptosis genesNorrin andp-Bad mRNA expression levels were lower than those of control group while BadandCaspase-3 mRNA expression levels were higher than those of control group; invasion genesEaf2 a