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Sample records for growth factor promoter-based

  1. Analysis on the restriction factors of the green building scale promotion based on DEMATEL

    Science.gov (United States)

    Wenxia, Hong; Zhenyao, Jiang; Zhao, Yang

    2017-03-01

    In order to promote the large-scale development of the green building in our country, DEMATEL method was used to classify influence factors of green building development into three parts, including green building market, green technology and macro economy. Through the DEMATEL model, the interaction mechanism of each part was analyzed. The mutual influence degree of each barrier factor that affects the green building promotion was quantitatively analysed and key factors for the development of green building in China were also finally determined. In addition, some implementation strategies of promoting green building scale development in our country were put forward. This research will show important reference value and practical value for making policies of the green building promotion.

  2. New thrombopoietic growth factors

    OpenAIRE

    Kuter, David J.

    2007-01-01

    Although development of first-generation thrombopoietic growth factors (recombinant human thrombopoietin [TPO] and pegylated recombinant human megakaryocyte growth and development factor [PEG-rHuMGDF]) was stopped due to development of antibodies to PEG-rHuMGDF, nonimmunogenic second-generation thrombopoietic growth factors with unique pharmacologic properties have been developed. TPO peptide mimetics contain TPO receptor-activating peptides inserted into complementarity-determining regions o...

  3. FGF growth factor analogs

    Energy Technology Data Exchange (ETDEWEB)

    Zamora, Paul O [Gaithersburg, MD; Pena, Louis A [Poquott, NY; Lin, Xinhua [Plainview, NY; Takahashi, Kazuyuki [Germantown, MD

    2012-07-24

    The present invention provides a fibroblast growth factor heparin-binding analog of the formula: ##STR00001## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, X, Y and Z are as defined, pharmaceutical compositions, coating compositions and medical devices including the fibroblast growth factor heparin-binding analog of the foregoing formula, and methods and uses thereof.

  4. Growth factors and kinases in glioblastoma growth

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Peña-Ortiz

    2016-10-01

    Full Text Available Glioblastoma multiforme (GBM is the most aggressive type of brain cancer, having the highest invasion, migration, proliferation, and angiogenesis rates. Several signaling pathways are involved in the regulation of these processes including growth factors and their tyrosine kinase receptors, such as vascular endothelial growth factor (VEGF, transforming growth factor beta (TGFβ, fibroblast growth factor (FGF, platelet-derived growth factor (PDGF, and insulin-like growth factor–I (IGF–I. Different kinases and regulators also participate in signaling pathways initiated by growth factors, such as mitogen-activated kinases (MAPK, protein kinases C (PKC, phosphatidylinositol-3 kinases (PI3K, protein kinase B (PKB or Akt, glycogen synthase kinase 3β (GSK3β, the mTOR complex, and Bcl-2. In this review, we will focus on the role of these proteins as possible therapeutic targets in GBM.

  5. Gene regulation by growth factors

    International Nuclear Information System (INIS)

    Metz, R.; Gorham, J.; Siegfried, Z.; Leonard, D.; Gizang-Ginsberg, E.; Thompson, M.A.; Lawe, D.; Kouzarides, T.; Vosatka, R.; MacGregor, D.; Jamal, S.; Greenberg, M.E.; Ziff, E.B.

    1988-01-01

    To coordinate the proliferation and differentiation of diverse cell types, cells of higher eukaryotes communicate through the release of growth factors. These peptides interact with specific transmembrane receptors of other cells and thereby generate intracellular messengers. The many changes in cellular physiology and activity that can be induced by growth factors imply that growth factor-induced signals can reach the nucleus and control gene activity. Moreover, current evidence also suggests that unregulated signaling along such pathways can induce aberrant proliferation and the formation of tumors. This paper reviews investigations of growth factor regulation of gene expression conducted by the authors' laboratory

  6. Growth factors and new periodontology

    Directory of Open Access Journals (Sweden)

    Paknejad M

    1999-06-01

    Full Text Available Growth factors are biological mediators that have a key roll in proliferation, chemotaxy and"ndifferentiation by acting on specific receptors on the surface of cells and regulating events in wound"nhealing.They can be considered hormones that are not released in to the blood stream but have one a"nlocal action. Some of these factors can regulate premature change in GO to Gl phase in cell devesion"ncycle and even may stimulate synthesis of DNA in suitable cells, Growth substances, primarily secreted"nby fibroblasts, endothelia! cells, macrophages and platelet, include platelet derived growth factor"n(PDGF, insulin like growth factor (IGF transforming growth factor (TGFa and (3 and bone"nmorphogenetic proteins BMPs that approximately are the most important of them. (BMPs could be"nused to control events during periodontal, craniofacial and implant wound healing through favoring bone"nformation"nAccording toLynch, combination of PGDF and IGF1 would be effective in promoting growth of all the"ncomponents of the periodontium."nThe aim of this study was to characterize growth factor and review the literature to determine the"nmechanism of their function, classification and application in implant and periodontal treatment.

  7. Growth factors in cystic fibrosis

    Directory of Open Access Journals (Sweden)

    Negar Khalighi

    2016-01-01

    Full Text Available Introduction: Cystic fibrosis is one of the most common autosomal recessive diseases that affects sweat glands and mucosa. CF is a hereditary disease with annual incidence of about 2500 new cases in United Kingdom. Insulin-like growth factor-1 (IGF-1 and insulin-like growth factor binding protein-3 levels decrease in CF. The aim of this study was to assess the role of growth peptides in patients with CF. Method: We searched PubMed, Google scholar, IranMedex, and Scientific Information Database (SID in September 2012 to April 2014. We included clinical studies with available abstracts and full texts that were in English or Persian languages. Manual searching was conducted within the reference lists of articles. Two reviewers independently applied eligibility criteria, assessed quality, and extracted data.Result: The earliest study was published in 1997 and the most recent one was in 2014. Study participants were adults in 3 studies (20% and 12 studies (80% were conducted in children. Patients with CF have lower levels of IGF-1 and there is a significant correlation between IGF-1 levels and growth index in patients with CF.Conclusions: IGF-1 decreases in children with CF and might be the cause of poor growth and low body mass index in these children.

  8. Physiological factors influencing capillary growth.

    Science.gov (United States)

    Egginton, S

    2011-07-01

    (1) Angiogenesis (growth of new capillaries from an existing capillary bed) may result from a mismatch in microvascular supply and metabolic demand (metabolic error signal). Krogh examined the distribution and number of capillaries to explore the correlation between O(2) delivery and O(2) consumption. Subsequently, the heterogeneity in angiogenic response within a muscle has been shown to reflect either differences in fibre type composition or mechanical load. However, local control leads to targetted angiogenesis in the vicinity of glycolytic fibre types following muscle stimulation, or oxidative fibres following endurance training, while heterogeneity of capillary spacing is maintained during ontogenetic growth. (2) Despite limited microscopy resolution and lack of specific markers, Krogh's interest in the structure of the capillary wall paved the way for understanding the mechanisms of capillary growth. Angiogenesis may be influenced by the response of perivascular or stromal cells (fibroblasts, macrophages and pericytes) to altered activity, likely acting as a source for chemical signals modulating capillary growth such as vascular endothelial growth factor. In addition, haemodynamic factors such as shear stress and muscle stretch play a significant role in adaptive remodelling of the microcirculation. (3) Most indices of capillarity are highly dependent on fibre size, resulting in possible bias because of scaling. To examine the consequences of capillary distribution, it is therefore helpful to quantify the area of tissue supplied by individual capillaries. This allows the spatial limitations inherent in most models of tissue oxygenation to be overcome generating an alternative approach to Krogh's tissue cylinder, the capillary domain, to improve descriptions of intracellular oxygen diffusion. © 2010 The Author. Acta Physiologica © 2010 Scandinavian Physiological Society.

  9. Epidermal growth factor and growth in vivo

    International Nuclear Information System (INIS)

    Rhodes, J.A.

    1986-01-01

    Epidermal growth factor (EGF) causes a dose-dependent thickening of the epidermis in suckling mice. The cellular mechanisms underlying this thickening were analyzed by measuring the effect of EGF on the cell-cycle. Neonatal mice were given daily injections of either 2ug EGF/g body weight/day or an equivalent volume of saline, and on the seventh day received a single injection of 3 H-thymidine. At various times the mice were perfused with fixative; 1um sections of skin were stained with a modification of Harris' hematoxylin and were autoradiographed. The sections were analyzed using three methods based on the dependence on time after injection of 3 H-thymidine of: frequency of labelled mitoses, labelling index, and reciprocal grains/nucleus. It was found that EGF caused a two-fold increase in the cell production rate. The effect of exogenous EGF on the morphology of gastric mucosa and incisors of suckling mice was also studied. The gastric mucosa appeared thicker in EGF-treated animals, but the effect was not statistically significant. In contrast to its effect on epidermis and gastric mucosa, EGF caused a significant, dose-dependent decrease in the size of the incisors. Because the mouse submandibular salivary gland is the major source of EGF the effect of sialoadenectomy on female reproductive functions was examined. Ablation of the submandibular gland had no effect on: length of estrus cycle, ability of the female to produce litters, length of the gestation period, litter size, and weight of the litter at birth. There was also no effect on survival of the offspring or on age at which the eyelids separated

  10. Growth factors, nutrient signaling, and cardiovascular aging.

    Science.gov (United States)

    Fontana, Luigi; Vinciguerra, Manlio; Longo, Valter D

    2012-04-13

    Growth factors regulated by specific macronutrients have been shown to promote aging and accelerate mortality in the majority of the organisms studied. In particular, the enzymes activated by growth hormone, insulin, and insulin-like growth factor-1 in mammals and their orthologs in simple model organisms represent perhaps the best-understood proteins involved in the aging process. Dietary restriction, which reduces the level of insulin-like growth factor-1 and of other growth factors, has been associated with protection from diabetes, cancer, and cardiovascular diseases, and deficiencies in growth hormone signaling and insulin-like growth factor-1 are strongly associated with protection from cancer and diabetes in both mice and humans; however, their role in cardiac function and cardiovascular diseases is controversial. Here, we review the link between growth factors, cardiac function, and heart disease with focus on the cardioprotective and sensitizing effect of growth factors in both model organisms and humans.

  11. Growth Factor Mediated Signaling in Pancreatic Pathogenesis

    Energy Technology Data Exchange (ETDEWEB)

    Nandy, Debashis; Mukhopadhyay, Debabrata, E-mail: mukhopadhyay.debabrata@mayo.edu [Department of Biochemistry and Molecular Biology, College of Medicine, Mayo Clinic, 200 First Street SW, Guggenheim 1321C, Rochester, MN 55905 (United States)

    2011-02-24

    Functionally, the pancreas consists of two types of tissues: exocrine and endocrine. Exocrine pancreatic disorders mainly involve acute and chronic pancreatitis. Acute pancreatitis typically is benign, while chronic pancreatitis is considered a risk factor for developing pancreatic cancer. Pancreatic carcinoma is the fourth leading cause of cancer related deaths worldwide. Most pancreatic cancers develop in the exocrine tissues. Endocrine pancreatic tumors are more uncommon, and typically are less aggressive than exocrine tumors. However, the endocrine pancreatic disorder, diabetes, is a dominant cause of morbidity and mortality. Importantly, different growth factors and their receptors play critical roles in pancreatic pathogenesis. Hence, an improved understanding of how various growth factors affect pancreatitis and pancreatic carcinoma is necessary to determine appropriate treatment. This chapter describes the role of different growth factors such as vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), platelet derived growth factor (PDGF), fibroblast growth factor (FGF), epidermal growth factor (EGF), and transforming growth factor (TGF) in various pancreatic pathophysiologies. Finally, the crosstalk between different growth factor axes and their respective signaling mechanisms, which are involved in pancreatitis and pancreatic carcinoma, are also discussed.

  12. Growth Factor Mediated Signaling in Pancreatic Pathogenesis

    International Nuclear Information System (INIS)

    Nandy, Debashis; Mukhopadhyay, Debabrata

    2011-01-01

    Functionally, the pancreas consists of two types of tissues: exocrine and endocrine. Exocrine pancreatic disorders mainly involve acute and chronic pancreatitis. Acute pancreatitis typically is benign, while chronic pancreatitis is considered a risk factor for developing pancreatic cancer. Pancreatic carcinoma is the fourth leading cause of cancer related deaths worldwide. Most pancreatic cancers develop in the exocrine tissues. Endocrine pancreatic tumors are more uncommon, and typically are less aggressive than exocrine tumors. However, the endocrine pancreatic disorder, diabetes, is a dominant cause of morbidity and mortality. Importantly, different growth factors and their receptors play critical roles in pancreatic pathogenesis. Hence, an improved understanding of how various growth factors affect pancreatitis and pancreatic carcinoma is necessary to determine appropriate treatment. This chapter describes the role of different growth factors such as vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), platelet derived growth factor (PDGF), fibroblast growth factor (FGF), epidermal growth factor (EGF), and transforming growth factor (TGF) in various pancreatic pathophysiologies. Finally, the crosstalk between different growth factor axes and their respective signaling mechanisms, which are involved in pancreatitis and pancreatic carcinoma, are also discussed

  13. Growth factor transgenes interactively regulate articular chondrocytes.

    Science.gov (United States)

    Shi, Shuiliang; Mercer, Scott; Eckert, George J; Trippel, Stephen B

    2013-04-01

    Adult articular chondrocytes lack an effective repair response to correct damage from injury or osteoarthritis. Polypeptide growth factors that stimulate articular chondrocyte proliferation and cartilage matrix synthesis may augment this response. Gene transfer is a promising approach to delivering such factors. Multiple growth factor genes regulate these cell functions, but multiple growth factor gene transfer remains unexplored. We tested the hypothesis that multiple growth factor gene transfer selectively modulates articular chondrocyte proliferation and matrix synthesis. We tested the hypothesis by delivering combinations of the transgenes encoding insulin-like growth factor I (IGF-I), fibroblast growth factor-2 (FGF-2), transforming growth factor beta1 (TGF-β1), bone morphogenetic protein-2 (BMP-2), and bone morphogenetic protien-7 (BMP-7) to articular chondrocytes and measured changes in the production of DNA, glycosaminoglycan, and collagen. The transgenes differentially regulated all these chondrocyte activities. In concert, the transgenes interacted to generate widely divergent responses from the cells. These interactions ranged from inhibitory to synergistic. The transgene pair encoding IGF-I and FGF-2 maximized cell proliferation. The three-transgene group encoding IGF-I, BMP-2, and BMP-7 maximized matrix production and also optimized the balance between cell proliferation and matrix production. These data demonstrate an approach to articular chondrocyte regulation that may be tailored to stimulate specific cell functions, and suggest that certain growth factor gene combinations have potential value for cell-based articular cartilage repair. Copyright © 2012 Wiley Periodicals, Inc.

  14. Transforming growth factor alpha and epidermal growth factor in laryngeal carcinomas demonstrated by immunohistochemistry

    DEFF Research Database (Denmark)

    Christensen, M E; Therkildsen, M H; Poulsen, Steen Seier

    1993-01-01

    Fifteen laryngeal squamous cell carcinomas were investigated for the presence of transforming growth factor alpha (TGF-alpha) and epidermal growth factor (EGF) using immunohistochemical methods. In a recent study the same material was characterized for epidermal growth factor receptors (EGF recep...

  15. Alternative Measures of Total Factor Productivity Growth

    NARCIS (Netherlands)

    Ten Raa, T.; Shestalova, V.

    2006-01-01

    The four main approaches to the measurement of total factor productivity (TFP)-growth and its decomposition are (i) Solow's residual analysis, (ii) the Index Number Approach, (iii) Input-Output Analysis (IO), and (iv) Data Envelopment Analysis (DEA).The corresponding measures of TFP growth are based

  16. Epidermal growth factor in the rat prostate

    DEFF Research Database (Denmark)

    Tørring, Niels; Jørgensen, P E; Poulsen, Steen Seier

    1998-01-01

    Epidermal growth factor (EGF) induces proliferation in prostate epithelial and stromal cells in primary culture. This investigation was set up to characterize the time and spatial expression of EGF in the rat prostate....

  17. New Clue Found to Growth Factor Action.

    Science.gov (United States)

    Hoffman, Michelle

    1991-01-01

    Discussed is the discovery which may help to explain epidermal growth factor effects on the cell skeleton. The role of a protein called profilin in the regulation of the microfilament system is described. (CW)

  18. Epidermal growth factor in the rat prostate

    DEFF Research Database (Denmark)

    Tørring, Niels; Jørgensen, P E; Poulsen, Steen Seier

    1998-01-01

    Epidermal growth factor (EGF) induces proliferation in prostate epithelial and stromal cells in primary culture. This investigation was set up to characterize the time and spatial expression of EGF in the rat prostate.......Epidermal growth factor (EGF) induces proliferation in prostate epithelial and stromal cells in primary culture. This investigation was set up to characterize the time and spatial expression of EGF in the rat prostate....

  19. Antenatal risk factor for intrauterine growth restriction

    Directory of Open Access Journals (Sweden)

    N. D. Guliyev

    2015-01-01

    Full Text Available Objective: to study pregnancy and delivery characteristics in mothers who have given birth to infants with intrauterine growth restriction. Pregnancy and delivery outcomes were studied in 315 mothers who had given birth to infants with intrauterine growth restriction (a study group. The studies have shown that toxemia, anemia, and preeclampsia prevent physiological pregnancy that concurrent with placental insufficiency leads to serious metabolic disturbances in the mother-placenta-fetus system and eventually lead to intrauterine growth restriction. A set of pathological factors of pregnancy required surgical delivery in mothers with fetal growth restriction.

  20. Growth factors for treating diabetic foot ulcers.

    Science.gov (United States)

    Martí-Carvajal, Arturo J; Gluud, Christian; Nicola, Susana; Simancas-Racines, Daniel; Reveiz, Ludovic; Oliva, Patricio; Cedeño-Taborda, Jorge

    2015-10-28

    Foot ulcers are a major complication of diabetes mellitus, often leading to amputation. Growth factors derived from blood platelets, endothelium, or macrophages could potentially be an important treatment for these wounds but they may also confer risks. To assess the benefits and harms of growth factors for foot ulcers in patients with type 1 or type 2 diabetes mellitus. In March 2015 we searched the Cochrane Wounds Group Specialised Register, The Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library), Ovid MEDLINE, Ovid MEDLINE (In-Process & Other Non-Indexed Citations, Ovid EMBASE and EBSCO CINAHL. There were no restrictions with respect to language, date of publication or study setting. Randomised clinical trials in any setting, recruiting people with type 1 or type 2 diabetes mellitus diagnosed with a foot ulcer. Trials were eligible for inclusion if they compared a growth factor plus standard care (e.g., antibiotic therapy, debridement, wound dressings) versus placebo or no growth factor plus standard care, or compared different growth factors against each other. We considered lower limb amputation (minimum of one toe), complete healing of the foot ulcer, and time to complete healing of the diabetic foot ulcer as the primary outcomes. Independently, we selected randomised clinical trials, assessed risk of bias, and extracted data in duplicate. We estimated risk ratios (RR) for dichotomous outcomes. We measured statistical heterogeneity using the I(2) statistic. We subjected our analyses to both fixed-effect and random-effects model analyses. We identified 28 randomised clinical trials involving 2365 participants. The cause of foot ulcer (neurologic, vascular, or combined) was poorly defined in all trials. The trials were conducted in ten countries. The trials assessed 11 growth factors in 30 comparisons: platelet-derived wound healing formula, autologous growth factor, allogeneic platelet-derived growth factor, transforming growth

  1. Engineering growth factors for regenerative medicine applications.

    Energy Technology Data Exchange (ETDEWEB)

    Mitchell, Aaron C.; Briquez, Priscilla S.; Hubbell, Jeffrey A.; Cochran, Jennifer R.

    2016-01-15

    Growth factors are important morphogenetic proteins that instruct cell behavior and guide tissue repair and renewal. Although their therapeutic potential holds great promise in regenerative medicine applications, translation of growth factors into clinical treatments has been hindered by limitations including poor protein stability, low recombinant expression yield, and suboptimal efficacy. This review highlights current tools, technologies, and approaches to design integrated and effective growth factor-based therapies for regenerative medicine applications. The first section describes rational and combinatorial protein engineering approaches that have been utilized to improve growth factor stability, expression yield, biodistribution, and serum half-life, or alter their cell trafficking behavior or receptor binding affinity. The second section highlights elegant biomaterial-based systems, inspired by the natural extracellular matrix milieu, that have been developed for effective spatial and temporal delivery of growth factors to cell surface receptors. Although appearing distinct, these two approaches are highly complementary and involve principles of molecular design and engineering to be considered in parallel when developing optimal materials for clinical applications.

  2. Transforming growth factor alpha and epidermal growth factor in laryngeal carcinomas demonstrated by immunohistochemistry

    DEFF Research Database (Denmark)

    Christensen, M E; Therkildsen, M H; Poulsen, Steen Seier

    1993-01-01

    the basal cell layer. The present investigation and our previous results confirm the existence of EGF receptors, TGF-alpha and EGF in laryngeal carcinomas. In addition, we conclude that the conditions do exist for growth factors to act through an autocrine system in poorly differentiated tumours and through......Fifteen laryngeal squamous cell carcinomas were investigated for the presence of transforming growth factor alpha (TGF-alpha) and epidermal growth factor (EGF) using immunohistochemical methods. In a recent study the same material was characterized for epidermal growth factor receptors (EGF...... receptors) which were confined predominantly to the undifferentiated cells. The expression of this growth factor system in malignant cells may play a role in carcinogenesis and/or tumour growth. All carcinomas were positive for TGF-alpha and 12 were positive for EGF. In moderately-to-well differentiated...

  3. Hydroxamic Acid from Histoplasma capsulatum That Displays Growth Factor Activity

    OpenAIRE

    Burt, Wayne R.; Underwood, Anthony L.; Appleton, Georgia L.

    1981-01-01

    Growth factor(s) present in a spent liquid medium after culture of the yeast form of Histoplasma capsulatum enhanced both yeast and mycelial growth of nine isolates tested. Hydroxamic acid extracted from the culture fluid displayed growth factor activity.

  4. A role of placental growth factor in hair growth.

    Science.gov (United States)

    Yoon, Sun-Young; Yoon, Ji-Seon; Jo, Seong Jin; Shin, Chang Yup; Shin, Jong-Yeon; Kim, Jong-Il; Kwon, Ohsang; Kim, Kyu Han

    2014-05-01

    The dermal papilla (DP) comprises specialized mesenchymal cells at the bottom of the hair follicle and plays a pivotal role in hair formation, anagen induction and the hair cycle. In this study, DPs were isolated from human hair follicles and serially subcultured. From each subculture at passages 1, 3, and 5 (n=4), we compared gene expression profiles using mRNA sequencing. Among the growth factors that were down-regulated in later passages of human DP cells (hDPCs), placental growth factor (PlGF) was selected. To elucidate the effect of PlGF on hair growth. We evaluated the effect of PlGF on hDPCs and on ex vivo hair organ culture. We investigated the effect of PlGF on an in vivo model of depilation-induced hair regeneration. We confirmed that the mRNA and protein expression levels of PlGF significantly decreased following subculture of the cells. It was shown that PlGF enhanced hair shaft elongation in ex vivo hair organ culture. Furthermore, PlGF significantly accelerated hair follicle growth and markedly prolonged anagen hair growth in an in vivo model of depilation-induced hair regeneration. PlGF prevented cell death by increasing the levels of phosphorylated extracellular signal-regulated kinase (ERK) and cyclin D1 and promoted survival by up-regulation of phosphorylated Akt and Bcl2, as determined by Western blotting. Our results suggest that PlGF plays a role in the promotion of hair growth and therefore may serve as an additional therapeutic target for the treatment of alopecia. Copyright © 2014 Japanese Society for Investigative Dermatology. Published by Elsevier Ireland Ltd. All rights reserved.

  5. Growth factors in porcine full and partial thickness burn repair. Differing targets and effects of keratinocyte growth factor, platelet-derived growth factor-BB, epidermal growth factor, and neu differentiation factor.

    OpenAIRE

    Danilenko, D. M.; Ring, B. D.; Tarpley, J. E.; Morris, B.; Van, G. Y.; Morawiecki, A.; Callahan, W.; Goldenberg, M.; Hershenson, S.; Pierce, G. F.

    1995-01-01

    The topical application of recombinant growth factors such as epidermal growth factor, platelet-derived growth factor-BB homodimer (rPDGF-BB), keratinocyte growth factor (rKGF), and neu differentiation factor has resulted in significant acceleration of healing in several animal models of wound repair. In this study, we established highly reproducible and quantifiable full and deep partial thickness porcine burn models in which burns were escharectomized 4 or 5 days postburn and covered with a...

  6. Nerve growth factor promotes human hemopoietic colony growth and differentiation

    International Nuclear Information System (INIS)

    Matsuda, H.; Coughlin, M.D.; Bienenstock, J.; Denburg, J.A.

    1988-01-01

    Nerve growth factor (NGF) is a neurotropic polypeptide necessary for the survival and growth of some central neurons, as well as sensory afferent and sympathetic neurons. Much is now known of the structural and functional characteristics of NGF, whose gene has recently been clones. Since it is synthesized in largest amounts by the male mouse submandibular gland, its role exclusively in nerve growth is questionable. These experiments indicate that NGF causes a significant stimulation of granulocyte colonies grown from human peripheral blood in standard hemopoietic methylcellulose assays. Further, NGF appears to act in a relatively selective fashion to induce the differentiation of eosinophils and basophils/mast cells. Depletion experiments show that the NGF effect may be T-cell dependent and that NGF augments the colony-stimulating effect of supernatants from the leukemic T-cell (Mo) line. The hemopoietic activity of NGF is blocked by 125 I-polyclonal and monoclonal antibodies to NGF. The authors conclude that NGF may indirectly act as a local growth factor in tissues other than those of the nervous system by causing T cells to synthesize or secrete molecules with colony-stimulating activity. In view of the synthesis of NGF in tissue injury, the involvement of basophils/mast cells and eosinophils in allergic and other inflammatory processes, and the association of mast cells with fibrosis and tissue repair, they postulate that NGF plays an important biological role in a variety of repair processes

  7. Epidermal Growth Factor and Intestinal Barrier Function

    Directory of Open Access Journals (Sweden)

    Xiaopeng Tang

    2016-01-01

    Full Text Available Epidermal growth factor (EGF is a 53-amino acid peptide that plays an important role in regulating cell growth, survival, migration, apoptosis, proliferation, and differentiation. In addition, EGF has been established to be an effective intestinal regulator helping to protect intestinal barrier integrity, which was essential for the absorption of nutrients and health in humans and animals. Several researches have demonstrated that EGF via binding to the EGF receptor and subsequent activation of Ras/MAPK, PI3K/AKT, PLC-γ/PKC, and STATS signal pathways regulates intestinal barrier function. In this review, the relationship between epidermal growth factor and intestinal development and intestinal barrier is described, to provide a better understanding of the effects of EGF on intestine development and health.

  8. Vascular endothelial growth factor ( VEGF ) receptor expression ...

    African Journals Online (AJOL)

    Background: Colorectal carcinoma (CRC) is the seventh-most common malignancy and is the main cause of death in Iraq. The incidence of this cancer has increased sharply after the invasion of Iraq in 2003. Aim: To estimate immunohistochemical expression of vascular endothelial growth factor (VEGF) in CRC in relation ...

  9. Fibroblast growth factor 23 - et fosfatregulerende hormon

    DEFF Research Database (Denmark)

    Beck-Nielsen, Signe; Pedersen, Susanne Møller; Kassem, Moustapha

    2010-01-01

    Fibroblast growth factor 23 (FGF23) er et nyligt identificeret fosfatonin. FGF23's fysiologiske hovedfunktion er at opretholde normalt serumfosfat og at virke som et D-vitaminmodregulatorisk hormon. Sygdomme, der er koblet til forhøjet serum FGF23, er hypofosfatæmisk rakitis, fibrøs dysplasi og...

  10. Growth Factors and Tension-Induced Skeletal Muscle Growth

    Science.gov (United States)

    Vandenburgh, Herman H.

    1994-01-01

    The project investigated biochemical mechanisms to enhance skeletal muscle growth, and developed a computer based mechanical cell stimulator system. The biochemicals investigated in this study were insulin/(Insulin like Growth Factor) IGF-1 and Steroids. In order to analyze which growth factors are essential for stretch-induced muscle growth in vitro, we developed a defined, serum-free medium in which the differentiated, cultured avian muscle fibers could be maintained for extended periods of time. The defined medium (muscle maintenance medium, MM medium) maintains the nitrogen balance of the myofibers for 3 to 7 days, based on myofiber diameter measurements and myosin heavy chain content. Insulin and IGF-1, but not IGF-2, induced pronounced myofiber hypertrophy when added to this medium. In 5 to 7 days, muscle fiber diameters increase by 71 % to 98% compared to untreated controls. Mechanical stimulation of the avian muscle fibers in MM medium increased the sensitivity of the cells to insulin and IGF-1, based on a leftward shift of the insulin dose/response curve for protein synthesis rates. (54). We developed a ligand binding assay for IGF-1 binding proteins and found that the avian skeletal muscle cultures produced three major species of 31, 36 and 43 kD molecular weight (54) Stretch of the myofibers was found to have no significant effect on the efflux of IGF-1 binding proteins, but addition of exogenous collagen stimulated IGF-1 binding protein production 1.5 to 5 fold. Steroid hormones have a profound effect on muscle protein turnover rates in vivo, with the stress-related glucocorticoids inducing rapid skeletal muscle atrophy while androgenic steroids induce skeletal muscle growth. Exercise in humans and animals reduces the catabolic effects of glucocorticoids and may enhance the anabolic effects of androgenic steroids on skeletal muscle. In our continuing work on the involvement of exogenrus growth factors in stretch-induced avian skeletal muscle growth, we

  11. Effects of growth-promoting factors on proliferation of mouse ...

    African Journals Online (AJOL)

    AJL

    2012-02-16

    SSCs) in vitro are critical to our understanding of male infertility, genetic resources and endangered species conservation. To investigate the effects of growth-promoting factors, epidermal growth factor (EGF), insulin-like growth.

  12. Heparin-binding epidermal growth factor-like growth factor promotes neuroblastoma differentiation.

    Science.gov (United States)

    Gaviglio, Angela L; Knelson, Erik H; Blobe, Gerard C

    2017-05-01

    High-risk neuroblastoma is characterized by undifferentiated neuroblasts and low schwannian stroma content. The tumor stroma contributes to the suppression of tumor growth by releasing soluble factors that promote neuroblast differentiation. Here we identify heparin-binding epidermal growth factor-like growth factor (HBEGF) as a potent prodifferentiating factor in neuroblastoma. HBEGF mRNA expression is decreased in human neuroblastoma tumors compared with benign tumors, with loss correlating with decreased survival. HBEGF protein is expressed only in stromal compartments of human neuroblastoma specimens, with tissue from high-stage disease containing very little stroma or HBEGF expression. In 3 human neuroblastoma cell lines (SK-N-AS, SK-N-BE2, and SH-SY5Y), soluble HBEGF is sufficient to promote neuroblast differentiation and decrease proliferation. Heparan sulfate proteoglycans and heparin derivatives further enhance HBEGF-induced differentiation by forming a complex with the epidermal growth factor receptor, leading to activation of the ERK1/2 and STAT3 pathways and up-regulation of the inhibitor of DNA binding transcription factor. These data support a role for loss of HBEGF in the neuroblastoma tumor microenvironment in neuroblastoma pathogenesis.-Gaviglio, A. L., Knelson, E. H., Blobe, G. C. Heparin-binding epidermal growth factor-like growth factor promotes neuroblastoma differentiation. © FASEB.

  13. Beta cell proliferation and growth factors

    DEFF Research Database (Denmark)

    Nielsen, Jens Høiriis; Svensson, C; Møldrup, Annette

    1999-01-01

    cloned a novel GH/PRL stimulated rat islet gene product, Pref-1 (preadipocyte factor-1). This protein contains six EGF-like motifs and may play a role both in embryonic pancreas differentiation and in beta cell growth and function. In summary, the increasing knowledge about the mechanisms involved...... in beta cell differentiation and proliferation may lead to new ways of forming beta cells for treatment of diabetes in man....

  14. Insulin-like growth factors act synergistically with basic fibroblast growth factor and nerve growth factor to promote chromaffin cell proliferation

    DEFF Research Database (Denmark)

    Frödin, M; Gammeltoft, S

    1994-01-01

    We have investigated the effects of insulin-like growth factors (IGFs), basic fibroblast growth factor (bFGF), and nerve growth factor (NGF) on DNA synthesis in cultured chromaffin cells from fetal, neonatal, and adult rats by using 5-bromo-2'-deoxyuridine (BrdUrd) pulse labeling for 24 or 48 h...

  15. Serum platelet-derived growth factor and fibroblast growth factor in patients with benign and malignant ovarian tumors

    DEFF Research Database (Denmark)

    Madsen, Christine Vestergaard; Steffensen, Karina Dahl; Olsen, Dorte Aalund

    2012-01-01

    New biological markers with predictive or prognostic value are highly warranted in the treatment of ovarian cancer. The platelet-derived growth factor (PDGF) system and fibroblast growth factor (FGF) system are important components in tumor growth and angiogenesis.......New biological markers with predictive or prognostic value are highly warranted in the treatment of ovarian cancer. The platelet-derived growth factor (PDGF) system and fibroblast growth factor (FGF) system are important components in tumor growth and angiogenesis....

  16. Role of Growth Factors in the Development of Mandible

    Directory of Open Access Journals (Sweden)

    Deepu Leander

    2011-01-01

    Growth factors are a large family of polypeptide molecules that regulate cell division in many tissues by autocrine or paracrine mechanisms. Depending on what receptors are activated, growth factors can initiate mitogenic, antiproliferative or trophic effects, that is growth factors act as positive or negative modulators of cell proliferation. The synergistic and orchestrated influences of various growth factors and other regulatory factors that are endogenously expressed in the condyle have been well documented. Growth factors do not only play an important role in embryonic development and adult tissue homeostasis but also in pathological situations, like infection and wound healing. Consequently, the applications of growth factors have therapeutic applications.

  17. Waste management - cytokines, growth factors and cachexia.

    Science.gov (United States)

    Saini, Amarjit; Al-Shanti, Nasser; Nasser, Al-Shanti; Stewart, Claire E H

    2006-12-01

    Muscle damage with a lack of regeneration, manifests itself in several life-threatening diseases, including cancer cachexia, congestive heart failure, AIDS and sepsis. Often misdiagnosed as a condition simply of weight loss, cachexia is actually a highly complex metabolic disorder involving features of anorexia, anaemia, lipolysis and insulin resistance. A significant loss of lean body mass arises from such conditions, resulting in wasting of skeletal muscle. Unlike starvation, the weight loss seen in chronic illnesses arises equally from loss of muscle and of fat. The cachectic state is particularly problematic in cancer, typifying poor prognosis and often lowering responses to chemotherapy and radiation treatment. More than half of cancer patients suffer from cachexia, and strikingly, nearly one-third of cancer deaths are related to cachexia rather than the tumour burden. In considering this disorder, we are faced with a conundrum; how is it possible for uncontrolled growth to prevail in the tumour, in the face of unrestrained tissue loss in our muscles? Consistently, the catabolic state has been associated with a shift in the homeostatic balance between muscle synthesis and degradation mediated by the actions of growth factors and cytokines. Indeed, tumour necrosis factor-alpha (TNF-alpha) levels are raised in several animal models of cachectic muscle wasting, whereas the insulin-like growth factor (IGF) system acts potently to regulate muscle development, hypertrophy and maintenance. This concept of skeletal muscle homeostasis, often viewed as the net balance between two separate processes of protein synthesis and degradation has however changed. More recently, the view is that these two biochemical processes are not occurring independently of each other but in fact are finely co-ordinated by a web of intricate signalling networks. This review, therefore, aims to discuss data currently available regarding the mechanisms of degeneration and regeneration with

  18. EXPRESSION OF GROWTH-FACTORS AND GROWTH-FACTOR RECEPTORS IN NORMAL AND TUMOROUS HUMAN THYROID TISSUES

    NARCIS (Netherlands)

    van der Laan, B.F.A.M.; FREEMAN, JL; ASA, SL

    A number of growth factors have been implicated as stimuli of thyroid cell proliferation; overexpression of these growth factors and/or their receptors may play a role in the growth of thyroid tumors. To determine if immunohistochemical detection of growth factors and/or their receptors correlates

  19. Beta cell proliferation and growth factors

    DEFF Research Database (Denmark)

    Nielsen, Jens Høiriis; Svensson, C; Møldrup, Annette

    1999-01-01

    cloned a novel GH/PRL stimulated rat islet gene product, Pref-1 (preadipocyte factor-1). This protein contains six EGF-like motifs and may play a role both in embryonic pancreas differentiation and in beta cell growth and function. In summary, the increasing knowledge about the mechanisms involved......Formation of new beta cells can take place by two pathways: replication of already differentiated beta cells or neogenesis from putative islet stem cells. Under physiological conditions both processes are most pronounced during the fetal and neonatal development of the pancreas. In adulthood little...

  20. Nerve growth factor and wound healing.

    Science.gov (United States)

    Kawamoto, Keiko; Matsuda, Hiroshi

    2004-01-01

    The wound healing process following tissue injury consists of a highly regulated sequence of events. Besides many biological activities on both neuronal and nonneuronal cells, nerve growth factor (NGF) has been proposed as an important component of wound healing and tissue repair process in vivo and in vitro. For example, NGF accelerates the rate of wound healing both in normal mice and healing-impaired diabetic mice, and has a potent pharmacological effect in the treatment for ulcer of the skin and cornea in humans. This review summarizes the evidence for the role of NGF in wound healing and tissue repair, and introduces its clinical utility as a therapeutic agent for various diseases.

  1. Growth factors: biological and clinical aspects

    International Nuclear Information System (INIS)

    Ruifrok, A.C.C.; McBride, W.H.

    1999-01-01

    Purpose: The purpose of this meeting summary is to provide an overview of cytokine research and its role in radiation oncology. Methods and Materials: The sixth annual Radiation Workshop was held at the International Festival Institute at Round Top, TX. Results: Presentations of seventeen speakers provided the framework for discussions on the biological and clinical aspects of cytokine research. Conclusion: Orchestration of coordinated cellular responses over the time course of radiation effects requires the interaction of many growth factors with their receptors as well as cell-cell and cell-matrix interactions. Cytokine networks and integrated systems are important in tumor development, cancer treatment, and normal and tumor response to cancer treatment

  2. Factores de crecimiento III: factores transformadores del crecimiento (TGF Growth factors III part: transforming growth factors (TGF

    Directory of Open Access Journals (Sweden)

    Hilda Norha Jaramillo Londoño

    1996-04-01

    Full Text Available Se presenta una revisión de los conceptos básicos sobre los factores transformadores del crecimiento, tanto alfa como beta, incluyendo los siguientes aspectos: consideraciones generales, estructura bioquímica, concentraciones, proteínas transportadoras, receptores, mecanismos de acción y efectos biológicos. A review is presented on the basic concepts of Transforming Growth Factors both a and p; it includes general considerations, biochemical structure, concentrations, binding proteins, receptors, mechanisms of action, and biological effects.

  3. Epidermal growth factor receptor signaling in tissue

    Energy Technology Data Exchange (ETDEWEB)

    Shvartsman, Stanislav; Wiley, H. S.; Lauffenburger, Douglas A.

    2004-08-01

    Abstract: A peptide purified from the salivary gland of a mouse was shown few years ago to accelerate incisor eruption and eyelid opening in newborn mice, and was named epidermal growth factor (EGF). The members of this family of peptide growth factors had been identified in numerous physiological and pathological contexts. EGF binds to a cell surface EGF receptor, which induces a biochemical modification (phosphorylation) of the receptor's cytoplasmic tail. There is a growing consensus in the research community that, in addition to cellular and molecular studies, the dynamics of the EGFR network and its operation must be examined in tissues. A key challenge is to integrate the existing molecular and cellular information into a system-level description of the EGFR network at the tissue and organism level. In this paper, the two examples of EGFR signaling in tissues are described, and the recent efforts to model EGFR autocrine loops, which is a predominant mode of EGFR activation in vivo, are summarized.

  4. Growth factors for treating diabetic foot ulcers

    DEFF Research Database (Denmark)

    Martí-Carvajal, Arturo J; Gluud, Christian; Nicola, Susana

    2015-01-01

    (In-Process & Other Non-Indexed Citations, Ovid EMBASE and EBSCO CINAHL. There were no restrictions with respect to language, date of publication or study setting. SELECTION CRITERIA: Randomised clinical trials in any setting, recruiting people with type 1 or type 2 diabetes mellitus diagnosed...... following treatment for diabetic foot ulcers (RR 0.64, 95% CI 0.14 to 2.94; P value 0.56, low quality of evidence)Although 11 trials reported time to complete healing of the foot ulcers in people with diabetes , meta-analysis was not possible for this outcome due to the unique comparisons within each trial......, failure to report data, and high number of withdrawals. Data on quality of life were not reported. Growth factors showed an increasing risk of overall adverse event rate compared with compared with placebo or no growth factor (255/498 (51.20%) versus 169/332 (50.90%); RR 0.83; 95% CI 0.72 to 0.96; I(2...

  5. Radioreceptor assay for epidermal growth factor

    International Nuclear Information System (INIS)

    Ladda, R.L.; Bullock, L.P.; Gianopoulos, T.; McCormick, L.

    1979-01-01

    An established cell line of human lung fibroblasts with a high number of surface receptors for mouse epidermal growth factor (mEGF) was used to deveop a simple and highly sensitive radioreceptor assay for EGF. 125 I-Labeled mEGF competed mole for mole with unlabeled mEGF for specific receptors. Optimal range for discriminating EGF concentrations in body fluids and tissue extracts by a competitive binding assay was between 5 and 100 ng/ml. Interassay correlation of variation was 8.47% and the recovery of highly purified mEGF added to serum and urine samples was greater than 95%. Human serum and amniotic fluids contained about 24 and 4 ng/ml, respectively, of mEGF equivalents. Concentrations of mEGF in mouse urine and serum were highly variable and were 2- to 10-fold greater than that previously detected by radioimmune assay. Hypophysectomy nearly abolished submaxillary mEGF content in both male and female mice, but testosterone treatment of hypophysectomized animals restored normal concentrations of mEGF to the glands. mEGF added to culture medium disappeared with time as a function of the number of cellular EGF receptors indicating cellular degradation of the growth factor. The radioreceptor assay for EGF is based on the close biologic relationship between the cell receptor site and the native hormone and should prove to be a useful complementary tool to characterize the physiological role of EGF

  6. Autologous growth factor injections in chronic tendinopathy.

    Science.gov (United States)

    Sandrey, Michelle A

    2014-01-01

    de Vos RJ, van Veldhoven PLJ, Moen MH, Weir A, Tol JL. Autologous growth factor injections in chronic tendinopathy: a systematic review. Br Med Bull. 2010;95:63-77. The authors of this systematic review evaluated the literature to critically consider the effects of growth factors delivered through autologous whole-blood and platelet-rich-plasma (PRP) injections in managing wrist-flexor and -extensor tendinopathies, plantar fasciopathy, and patellar tendinopathy. The primary question was, according to the published literature, is there sufficient evidence to support the use of growth factors delivered through autologous whole-blood and PRP injections for chronic tendinopathy? The authors performed a comprehensive, systematic literature search in October 2009 using PubMed, MEDLINE, EMBASE, CINAHL, and the Cochrane library without time limits. The following key words were used in different combinations: tendinopathy, tendinosis, tendinitis, tendons, tennis elbow, plantar fasciitis, platelet rich plasma, platelet transfusion, and autologous blood or injection. The search was limited to human studies in English. All bibliographies from the initial literature search were also viewed to identify additional relevant studies. Studies were eligible based on the following criteria: (1) Articles were suitable (inclusion criteria) if the participants had been clinically diagnosed as having chronic tendinopathy; (2) the design had to be a prospective clinical study, randomized controlled trial, nonrandomized clinical trial, or prospective case series; (3) a well-described intervention in the form of a growth factor injection with either PRP or autologous whole blood was used; and (4) the outcome was reported in terms of pain or function (or both). All titles and abstracts were assessed by 2 researchers, and all relevant articles were obtained. Two researchers independently read the full text of each article to determine if it met the inclusion criteria. If opinions differed on

  7. Plasma placenta growth factor levels in midtrimester pregnancies

    NARCIS (Netherlands)

    Tjoa, M. L.; van Vugt, J. M.; Mulders, M. A.; Schutgens, R. B.; Oudejans, C. B.; van Wijk, I. J.

    2001-01-01

    Previous studies have shown decreased levels of placenta growth factor in serum of pregnant women with preeclampsia. The aim of this study was to investigate whether levels of placenta growth factor are decreased before the clinical onset of preeclampsia, and whether placenta growth factor levels

  8. Effects of growth-promoting factors on proliferation of mouse ...

    African Journals Online (AJOL)

    SSCs) in vitro are critical to our understanding of male infertility, genetic resources and endangered species conservation. To investigate the effects of growth-promoting factors, epidermal growth factor (EGF), insulin-like growth factor-1 (IGF-1) and ...

  9. Insulin-like growth factors act synergistically with basic fibroblast growth factor and nerve growth factor to promote chromaffin cell proliferation

    DEFF Research Database (Denmark)

    Frödin, M; Gammeltoft, S

    1994-01-01

    We have investigated the effects of insulin-like growth factors (IGFs), basic fibroblast growth factor (bFGF), and nerve growth factor (NGF) on DNA synthesis in cultured chromaffin cells from fetal, neonatal, and adult rats by using 5-bromo-2'-deoxyuridine (BrdUrd) pulse labeling for 24 or 48 h...... implications for improving the survival of chromaffin cell implants in diseased human brain....

  10. Activated human neutrophils release hepatocyte growth factor/scatter factor.

    LENUS (Irish Health Repository)

    McCourt, M

    2012-02-03

    BACKGROUND: Hepatocyte growth factor or scatter factor (HGF\\/SF) is a pleiotropic cytokine that has potent angiogenic properties. We have previously demonstrated that neutrophils (PMN) are directly angiogenic by releasing vascular endothelial growth factor (VEGF). We hypothesized that the acute inflammatory response can stimulate PMN to release HGF. AIMS: To examine the effects of inflammatory mediators on PMN HGF release and the effect of recombinant human HGF (rhHGF) on PMN adhesion receptor expression and PMN VEGF release. METHODS: In the first experiment, PMN were isolated from healthy volunteers and stimulated with tumour necrosis factor-alpha (TNF-alpha), lipopolysaccharide (LPS), interleukin-8 (IL-8), and formyl methionyl-leucyl-phenylalanine (fMLP). Culture supernatants were assayed for HGF using ELISA. In the second experiment, PMN were lysed to measure total HGF release and HGF expression in the PMN was detected by Western immunoblotting. Finally, PMN were stimulated with rhHGF. PMN CD 11a, CD 11b, and CD 18 receptor expression and VEGF release was measured using flow cytometry and ELISA respectively. RESULTS: TNF-alpha, LPS and fMLP stimulation resulted in significantly increased release of PMN HGF (755+\\/-216, 484+\\/-221 and 565+\\/-278 pg\\/ml, respectively) compared to controls (118+\\/-42 pg\\/ml). IL-8 had no effect. Total HGF release following cell lysis and Western blot suggests that HGF is released from intracellular stores. Recombinant human HGF did not alter PMN adhesion receptor expression and had no effect on PMN VEGF release. CONCLUSIONS: This study demonstrates that pro-inflammatory mediators can stimulate HGF release from a PMN intracellular store and that activated PMN in addition to secreting VEGF have further angiogenic potential by releasing HGF.

  11. Growth Factors and Breast Tumors, Comparison of Selected Growth Factors with Traditional Tumor Markers

    Czech Academy of Sciences Publication Activity Database

    Kučera, R.; Černá, M.; Ňaršanská, A.; Svobodová, Š.; Straková, M.; Vrzalová, J.; Fuchsová, R.; Třešková, I.; Kydlíček, T.; Třeška, V.; Pecen, Ladislav; Topolčan, O.; Padziora, P.

    2011-01-01

    Roč. 31, č. 12 (2011), s. 4653-4656 ISSN 0250-7005 Grant - others:GA MZd(CZ) NS9727; GA MZd(CZ) NS10238; GA MZd(CZ) NS10253 Institutional research plan: CEZ:AV0Z10300504 Keywords : growth factor * breast cancer * tumor markers * CA 15-3 * CEA * IGF1 * EGF * HGF Subject RIV: FD - Oncology ; Hematology Impact factor: 1.725, year: 2011

  12. Nerve growth factor interactions with mast cells.

    Science.gov (United States)

    Kritas, S K; Caraffa, A; Antinolfi, P; Saggini, A; Pantalone, A; Rosati, M; Tei, M; Speziali, A; Saggini, R; Pandolfi, F; Cerulli, G; Conti, P

    2014-01-01

    Neuropeptides are involved in neurogenic inflammation where there is vasodilation and plasma protein extravasion in response to this stimulus. Nerve growth factor (NGF), identified by Rita Levi Montalcini, is a neurotrophin family compound which is important for survival of nociceptive neurons during their development. Therefore, NGF is an important neuropeptide which mediates the development and functions of the central and peripheral nervous system. It also exerts its proinflammatory action, not only on mast cells but also in B and T cells, neutrophils and eosinophils. Human mast cells can be activated by neuropeptides to release potent mediators of inflammation, and they are found throughout the body, especially near blood vessels, epithelial tissue and nerves. Mast cells generate and release NGF after degranulation and they are involved in iperalgesia, neuroimmune interactions and tissue inflammation. NGF is also a potent degranulation factor for mast cells in vitro and in vivo, promoting differentiation and maturation of these cells and their precursor, acting as a co-factor with interleukin-3. In conclusion, these studies are focused on cross-talk between neuropeptide NGF and inflammatory mast cells.

  13. Fetal effects of epidermal growth factor deficiency induced in rats by autoantibodies against epidermal growth factor

    DEFF Research Database (Denmark)

    Raaberg, Lasse; Nexø, Ebba; Jørgensen, P E

    1995-01-01

    We have used rats with epidermal growth factor (EGF) autoantibodies to study the role of EGF deficiency during perinatal development. The study was focused on organs known to contain EGF or its receptor. Compared with controls, the offspring of autoimmune rats had a higher perinatal mortality and...

  14. Aldosterone as a renal growth factor.

    LENUS (Irish Health Repository)

    Thomas, Warren

    2011-04-05

    Aldosterone regulates blood pressure through its effects on the cardiovascular system and kidney. Aldosterone can also contribute to the development of hypertension that leads to chronic pathologies such as nephropathy and renal fibrosis. Aldosterone directly modulates renal cell proliferation and differentiation as part of normal kidney development. The stimulation of rapidly activated protein kinase cascades is one facet of how aldosterone regulates renal cell growth. These cascades may also contribute to myofibroblastic transformation and cell proliferation observed in pathological conditions of the kidney. Polycystic kidney disease is a genetic disorder that is accelerated by hypertension. EGFR-dependent proliferation of the renal epithelium is a factor in cyst development and trans-activation of EGFR is a key feature in initiating aldosterone-induced signalling cascades. Delineating the components of aldosterone-induced signalling cascades may identify novel therapeutic targets for proliferative diseases of the kidney.

  15. The population factor in economic growth theory

    NARCIS (Netherlands)

    Meilink, H.A.

    1974-01-01

    Reviews briefly the role of population growth in economic growth theory and makes a few critical remarks on the applied methodology and the underlying assumptions. Emphasis is laid on the possible relationships between population and economic growth in the developing countries, but also Malthus'

  16. Endogenous versus Exogenous Growth Factor Regulation of Articular Chondrocytes

    OpenAIRE

    Shi, Shuiliang; Chan, Albert G.; Mercer, Scott; Eckert, George J.; Trippel, Stephen B.

    2013-01-01

    Anabolic growth factors that regulate the function of articular chondrocytes are candidates for articular cartilage repair. Such factors may be delivered by pharmacotherapy in the form of exogenous proteins, or by gene therapy as endogenous proteins. It is unknown whether delivery method influences growth factor effectiveness in regulating articular chondrocyte reparative functions. We treated adult bovine articular chondrocytes with exogenous recombinant insulin-like growth factor-I (IGF-I) ...

  17. Economic growth factors system: theoretical and methodological aspect

    OpenAIRE

    H.Ya. Hlukha

    2014-01-01

    The aim of the article. The main objective of the article is to create theoretical grounds to build the system of economic growth factors, to modernize their classification, to define exogenous and endogenous factors, to analyze them within the state economic policy structure. The results of the analysis. The article focuses on economic growth factors theoretical studies: - economic growth factors classification characteristics have been highlighted; - various approaches to determine...

  18. Immunoreactive transforming growth factor alpha and epidermal growth factor in oral squamous cell carcinomas

    DEFF Research Database (Denmark)

    Therkildsen, M H; Poulsen, Steen Seier; Bretlau, P

    1993-01-01

    , the cells above the basal cell layer were positive for both TGF-alpha and EGF. The same staining pattern was observed in oral mucosa obtained from healthy persons. In moderately to well differentiated carcinomas, the immunoreactivity was mainly confined to the cytologically more differentiated cells, thus......Forty oral squamous cell carcinomas have been investigated immunohistochemically for the presence of transforming growth factor alpha (TGF-alpha) and epidermal growth factor (EGF). The same cases were recently characterized for the expression of EGF-receptors. TGF-alpha was detected...... previous results confirms the existence of TGF-alpha, EGF, and EGF-receptors in the majority of oral squamous cell carcinomas and their metastases....

  19. [Epidermal growth factor, innovation and safety].

    Science.gov (United States)

    Esquirol Caussa, Jordi; Herrero Vila, Elisabeth

    2015-10-05

    Bioidentical recombinant human epidermal growth factor (rhEGF) is available in concentrations and purity suitable for therapeutic use in long time stable formulations. Beneficial effects in several skin pathologies and lesions have been reported (traumatic and surgical wound healing, laser induced wounds, abnormal scars, keloids, radiation or chemotherapy induced dermatitis, post inflammatory hyperpigmentation or for skin aging damage repairing) and also may be considered for the treatment of several oropharingeal and high gastroesophageal tract mucosa diseases (mouth sores, pharyngeal fistulas, ulcers), and several corneal or conjunctive mucosa lesions. rhEGF has not shown any important side or collateral effects in humans or in laboratory experimentation animals, showing optimal tolerability and safety with continuous use for months. Compounding gives advantages of versatility, individualization, personalization, molecular stability, safety and effectiveness in ideal conditions, showing good tissue penetration, both on intact skin and skin lesions that expose the lower planes to the surface. rhEGF compounds can be considered for prevention or as a treatment of diverse skin and mucosa diseases and conditions through compounding preparations. Copyright © 2014 Elsevier España, S.L.U. All rights reserved.

  20. Fibroblast Growth Factor Signaling in Metabolic Regulation.

    Science.gov (United States)

    Nies, Vera J M; Sancar, Gencer; Liu, Weilin; van Zutphen, Tim; Struik, Dicky; Yu, Ruth T; Atkins, Annette R; Evans, Ronald M; Jonker, Johan W; Downes, Michael Robert

    2015-01-01

    The prevalence of obesity is a growing health problem. Obesity is strongly associated with several comorbidities, such as non-alcoholic fatty liver disease, certain cancers, insulin resistance, and type 2 diabetes, which all reduce life expectancy and life quality. Several drugs have been put forward in order to treat these diseases, but many of them have detrimental side effects. The unexpected role of the family of fibroblast growth factors in the regulation of energy metabolism provides new approaches to the treatment of metabolic diseases and offers a valuable tool to gain more insight into metabolic regulation. The known beneficial effects of FGF19 and FGF21 on metabolism, together with recently discovered similar effects of FGF1 suggest that FGFs and their derivatives carry great potential as novel therapeutics to treat metabolic conditions. To facilitate the development of new therapies with improved targeting and minimal side effects, a better understanding of the molecular mechanism of action of FGFs is needed. In this review, we will discuss what is currently known about the physiological roles of FGF signaling in tissues important for metabolic homeostasis. In addition, we will discuss current concepts regarding their pharmacological properties and effector tissues in the context of metabolic disease. Also, the recent progress in the development of FGF variants will be reviewed. Our goal is to provide a comprehensive overview of the current concepts and consensuses regarding FGF signaling in metabolic health and disease and to provide starting points for the development of FGF-based therapies against metabolic conditions.

  1. Nerve growth factor actions on the brain

    International Nuclear Information System (INIS)

    Martinez, H.J.

    1989-01-01

    We examined the effect of the trophic protein, nerve growth factor (NGF), on cultures of fetal rat neostriatum and basal forebrain-medial septal area (BF-MS) to define its role in brain development. Treatment of cultures with NGF resulted in an increase in the specific activity of the cholinergic enzyme choline acetyltransferase (CAT) in both brain areas. CAT was immunocytochemically localized to neurons. In the BF-MS, NGF treatment elicited a marked increase in staining intensity and an apparent increase in the number of CAT-positive neurons. Moreover, treatment of BF-MS cultures with NGF increased the activity of acetylcholinesterase, suggesting that the cholinergic neuron as a whole was affected. To begin defining mechanisms of action of NGF in the BF-MS, we detected NGF receptors by two independent methods. Receptors were localized to two different cellular populations: neuron-like cells, and non-neuron-like cells. Dissociation studies with [ 125 I]NGF suggested that high affinity receptors were localized to the neuron-like population. Only low-affinity receptors were localized to the non-neuron-like cells. Moreover, employing combined immunocytochemistry and [ 125 I]NGF autoradiography, we detected a subpopulation of CAT-containing neutrons that exhibited high-affinity binding. Unexpectedly, a gamma-aminobutyric acid (GABA)-containing cell group also expressed high affinity binding. However, only subsets of cholinergic or GABA neurons expressed high-affinity biding, suggesting that these transmitter populations are composed of differentially response subpopulations

  2. Hematopoietic growth factors including keratinocyte growth factor in allogeneic and autologous stem cell transplantation.

    Science.gov (United States)

    Seggewiss, Ruth; Einsele, Hermann

    2007-07-01

    The aim of hematopoietic stem cell transplantation (HSCT) is to cure patients of malignancies, autoimmune diseases, and immunodeficiency disorders by redirecting the immune system: the often described graft-versus-leukemia (GVL) or graft-versus-tumor (GVT) effects. Unfortunately, fulfillment of this goal is often hampered by relapse of the underlying disease, graft-versus-host disease (GVHD), or severe opportunistic infections, which account for the majority of post-transplantation deaths. Moreover, studies of long-term survivors of transplantation indicate an accelerated immune aging due to the transplantation procedure itself, preceding chemo- or radiotherapy, and acute and chronic GVHD. Significant advances have been made towards overcoming these obstacles by enhancing immune reconstitution with hematopoietic growth factors (HGFs) such as granulocyte colony-stimulating factor (G-CSF) or erythropoietin (EPO) or through the application of cytokines. In addition, there are approaches to promote the thymic-dependent development of naive T cells, which are prepared for the interaction with a multitude of pathogens. Examples are the application of keratinocyte growth factor (KGF), neuroendocrine hormones such as growth hormone or prolactin, sex hormone ablation, or the invention of a three-dimensional artificial thymus based on a cytomatrix. Might these measures result in a higher rate of healthy and fully recovered patients? Here we review progress in each of these areas.

  3. Insulin-Like Growth Factor-Independent Effects of Growth Hormone on Growth Plate Chondrogenesis and Longitudinal Bone Growth.

    Science.gov (United States)

    Wu, Shufang; Yang, Wei; De Luca, Francesco

    2015-07-01

    GH stimulates growth plate chondrogenesis and longitudinal bone growth directly at the growth plate. However, it is not clear yet whether these effects are entirely mediated by the local expression and action of IGF-1 and IGF-2. To determine whether GH has any IGF-independent growth-promoting effects, we generated (TamCart)Igf1r(flox/flox) mice. The systemic injection of tamoxifen in these mice postnatally resulted in the excision of the IGF-1 receptor (Igf1r) gene exclusively in the growth plate. (TamCart)Igf1r(flox/flox) tamoxifen-treated mice [knockout (KO) mice] and their Igf1r(flox/flox) control littermates (C mice) were injected for 4 weeks with GH. At the end of the 4-week period, the tibial growth and growth plate height of GH-treated KO mice were greater than those of untreated C or untreated KO mice. The systemic injection of GH increased the phosphorylation of Janus kinase 2 and signal transducer and activator of transcription 5B in the tibial growth plate of the C and KO mice. In addition, GH increased the mRNA expression of bone morphogenetic protein-2 and the mRNA expression and protein phosphorylation of nuclear factor-κB p65 in both C and KO mice. In cultured chondrocytes transfected with Igf1r small interfering RNA, the addition of GH in the culture medium significantly induced thymidine incorporation and collagen X mRNA expression. In conclusion, our findings demonstrate that GH can promote growth plate chondrogenesis and longitudinal bone growth directly at the growth plate, even when the local effects of IGF-1 and IGF-2 are prevented. Further studies are warranted to elucidate the intracellular molecular mechanisms mediating the IGF-independent, growth-promoting GH effects.

  4. Prognostic impact of placenta growth factor and vascular endothelial growth factor A in patients with breast cancer

    DEFF Research Database (Denmark)

    Maae, Else; Olsen, Dorte Aalund; Dahl Steffensen, Karina

    conditions such as ischemic heart disease, arthritis and tumor growth. Angiogenesis is a complex process with several growth factors involved. Because PlGF modulates VEGF-A responses we investigated their mutual relationship and impact on prognosis. Materials and methods: Quantitative PlGF and VEGF-A levels......Background: Placenta growth factor (PlGF) and vascular endothelial growth factor A (VEGF-A) are angiogenic growth factors interacting competitively with the same receptors. VEGF-A is essential in both normal and pathologic conditions, but the functions of PlGF seem to be restricted to pathologic...

  5. Enhanced Phosphoproteomic Profiling Workflow For Growth Factor Signaling Analysis

    DEFF Research Database (Denmark)

    Sylvester, Marc; Burbridge, Mike; Leclerc, Gregory

    2010-01-01

    A549 lung carcinoma cells were used as a model and stimulated with hepatocyte growth factor, epidermal growth factor or fibroblast growth factor. We employed a quick protein digestion workflow with spin filters without using urea. Phosphopeptides in general were enriched by sequential elution from...... transfer dissociation adds confidence in modification site assignment. The workflow is relatively simple but the integration of complementary techniques leads to a deeper insight into cellular signaling networks and the potential pharmacological intervention thereof....

  6. Fibroblast growth factor signaling in metabolic regulation

    Directory of Open Access Journals (Sweden)

    Vera eNies

    2016-01-01

    Full Text Available The prevalence of obesity is a growing health problem. Obesity is strongly associated with several comorbidities, such as non-alcoholic fatty liver disease, certain cancers, insulin resistance and type 2 diabetes, which all reduce life expectancy and life quality. Several drugs have been put forward in order to treat these diseases, but many of them have detrimental side effects. The unexpected role of the family of fibroblast growth factors in the regulation of energy metabolism provides new approaches to the treatment of metabolic diseases, and offers a valuable tool to gain more insight into metabolic regulation. The known beneficial effects of FGF19 and FGF21 on metabolism, together with recently discovered similar effects of FGF1 suggest that FGFs and their derivatives carry great potential as novel therapeutics to treat metabolic conditions. To facilitate the development of new therapies with improved targeting and minimal side effects, a better understanding of the molecular mechanism of action of FGFs is needed.In this review we will discuss what is currently known about the physiological roles of FGF signaling in tissues important for metabolic homeostasis. In addition, we will discuss current concepts regarding their pharmacological properties and effector tissues in the context of metabolic disease. Also the recent progress in the development of FGF variants will be reviewed. Our goal is to provide a comprehensive overview of the current concepts and consensuses regarding FGF signaling in metabolic health and disease, and to provide starting points for the development of FGF-based therapies against metabolic conditions.

  7. Factors influencing graphene growth on metal surfaces

    International Nuclear Information System (INIS)

    Loginova, E; Bartelt, N C; McCarty, K F; Feibelman, P J

    2009-01-01

    Graphene forms from a relatively dense, tightly bound C-adatom gas when elemental C is deposited on or segregates to the Ru(0001) surface. Nonlinearity of the graphene growth rate with C-adatom density suggests that growth proceeds by addition of C atom clusters to the graphene edge. The generality of this picture has now been studied by use of low-energy electron microscopy (LEEM) to observe graphene formation when Ru(0001) and Ir(111) surfaces are exposed to ethylene. The finding that graphene growth velocities and nucleation rates on Ru have precisely the same dependence on adatom concentration as for elemental C deposition implies that hydrocarbon decomposition only affects graphene growth through the rate of adatom formation. For ethylene, that rate decreases with increasing adatom concentration and graphene coverage. Initially, graphene growth on Ir(111) is like that on Ru: the growth velocity is the same nonlinear function of adatom concentration (albeit with much smaller equilibrium adatom concentrations, as we explain with DFT calculations of adatom formation energies). In the later stages of growth, graphene crystals that are rotated relative to the initial nuclei nucleate and grow. The rotated nuclei grow much faster. This difference suggests firstly, that the edge-orientation of the graphene sheets relative to the substrate plays an important role in the growth mechanism, and secondly, that attachment of the clusters to the graphene is the slowest step in cluster addition, rather than formation of clusters on the terraces.

  8. Hormones and growth factors in breast cancer

    African Journals Online (AJOL)

    could cause regression of female breast cancer. More surprising perhaps was the finding that oestrogens;" which appeared to be necessary for the maintenance and growth of breast cancer in younger women, could also be beneficial, albeit ... have no apparent effect on the growth of other organs. Early studies using both ...

  9. Novel Drosophila receptor that binds multiple growth factors

    International Nuclear Information System (INIS)

    Rosner, M.R.; Thompson, K.L.; Garcia, V.; Decker, S.J.

    1986-01-01

    The authors have recently reported the identification of a novel growth factor receptor from Drosophila cell cultures that has dual binding specificity for both insulin and epidermal growth factor (EGF). This 100 kDa protein is also antigenically related to the cytoplasmic region of the mammalian EGF receptor-tyrosine kinase. They now report that this protein binds to mammalian nerve growth factor and human transforming growth factor alpha as well as insulin and EGF with apparent dissociation constants ranging from 10 -6 to 10 -8 M. The 100 kDa protein can be affinity-labeled with these 125 I-labeled growth factors after immunoprecipitation with anti-EGF receptor antiserum. These four growth factors appear to share a common binding site, as evidenced by their ability to block affinity labelling by 125 I-insulin. No significant binding to the 100 kDa protein was observed with platelet-derived growth factor, transforming growth factor beta, or glucagon. The 100 kDa Drosophila protein has a unique ligand-binding spectrum with no direct counterpart in mammalian cells and may represent an evolutionary precursor of the mammalian receptors for these growth factors

  10. Organisational Factors of Rapid Growth of Slovenian Dynamic Enterprises

    Directory of Open Access Journals (Sweden)

    Pšeničny Viljem

    2013-01-01

    Full Text Available The authors provide key findings on the internal and external environmental factors of growth that affect the rapid growth of dynamic enterprises in relation to individual key organisational factors or functions. The key organisational relationships in a growing enterprise are upgraded with previous research findings and identified key factors of rapid growth through qualitative and quantitative analysis based on the analysis of 4,511 dynamic Slovenian enterprises exhibiting growth potential. More than 250 descriptive attributes of a sample of firms from 2011 were also used for further qualitative analysis and verification of key growth factors. On the basis of the sample (the study was conducted with 131 Slovenian dynamic enterprises, the authors verify whether these factors are the same as the factors that were studied in previous researches. They also provide empirical findings on rapid growth factors in relation to individual organisational functions: administration - management - implementation (entrepreneur - manager - employees. Through factor analysis they look for the correlation strength between individual variables (attributes that best describe each factor of rapid growth and that relate to the aforementioned organisational functions in dynamic enterprises. The research findings on rapid growth factors offer companies the opportunity to consider these factors during the planning and implementation phases of their business, to choose appropriate instruments for the transition from a small fast growing firm to a professionally managed growing company, to stimulate growth and to choose an appropriate growth strategy and organisational factors in order to remain, or become, dynamic enterprises that can further contribute to the preservation, growth and development of the Slovenian economy

  11. Placenta growth factor and vascular endothelial growth factor B expression in the hypoxic lung

    LENUS (Irish Health Repository)

    Sands, Michelle

    2011-01-25

    Abstract Background Chronic alveolar hypoxia, due to residence at high altitude or chronic obstructive lung diseases, leads to pulmonary hypertension, which may be further complicated by right heart failure, increasing morbidity and mortality. In the non-diseased lung, angiogenesis occurs in chronic hypoxia and may act in a protective, adaptive manner. To date, little is known about the behaviour of individual vascular endothelial growth factor (VEGF) family ligands in hypoxia-induced pulmonary angiogenesis. The aim of this study was to examine the expression of placenta growth factor (PlGF) and VEGFB during the development of hypoxic pulmonary angiogenesis and their functional effects on the pulmonary endothelium. Methods Male Sprague Dawley rats were exposed to conditions of normoxia (21% O2) or hypoxia (10% O2) for 1-21 days. Stereological analysis of vascular structure, real-time PCR analysis of vascular endothelial growth factor A (VEGFA), VEGFB, placenta growth factor (PlGF), VEGF receptor 1 (VEGFR1) and VEGFR2, immunohistochemistry and western blots were completed. The effects of VEGF ligands on human pulmonary microvascular endothelial cells were determined using a wound-healing assay. Results Typical vascular remodelling and angiogenesis were observed in the hypoxic lung. PlGF and VEGFB mRNA expression were significantly increased in the hypoxic lung. Immunohistochemical analysis showed reduced expression of VEGFB protein in hypoxia although PlGF protein was unchanged. The expression of VEGFA mRNA and protein was unchanged. In vitro PlGF at high concentration mimicked the wound-healing actions of VEGFA on pulmonary microvascular endothelial monolayers. Low concentrations of PlGF potentiated the wound-healing actions of VEGFA while higher concentrations of PlGF were without this effect. VEGFB inhibited the wound-healing actions of VEGFA while VEGFB and PlGF together were mutually antagonistic. Conclusions VEGFB and PlGF can either inhibit or potentiate the

  12. Placenta growth factor and vascular endothelial growth factor B expression in the hypoxic lung

    Directory of Open Access Journals (Sweden)

    McLoughlin Paul

    2011-01-01

    Full Text Available Abstract Background Chronic alveolar hypoxia, due to residence at high altitude or chronic obstructive lung diseases, leads to pulmonary hypertension, which may be further complicated by right heart failure, increasing morbidity and mortality. In the non-diseased lung, angiogenesis occurs in chronic hypoxia and may act in a protective, adaptive manner. To date, little is known about the behaviour of individual vascular endothelial growth factor (VEGF family ligands in hypoxia-induced pulmonary angiogenesis. The aim of this study was to examine the expression of placenta growth factor (PlGF and VEGFB during the development of hypoxic pulmonary angiogenesis and their functional effects on the pulmonary endothelium. Methods Male Sprague Dawley rats were exposed to conditions of normoxia (21% O2 or hypoxia (10% O2 for 1-21 days. Stereological analysis of vascular structure, real-time PCR analysis of vascular endothelial growth factor A (VEGFA, VEGFB, placenta growth factor (PlGF, VEGF receptor 1 (VEGFR1 and VEGFR2, immunohistochemistry and western blots were completed. The effects of VEGF ligands on human pulmonary microvascular endothelial cells were determined using a wound-healing assay. Results Typical vascular remodelling and angiogenesis were observed in the hypoxic lung. PlGF and VEGFB mRNA expression were significantly increased in the hypoxic lung. Immunohistochemical analysis showed reduced expression of VEGFB protein in hypoxia although PlGF protein was unchanged. The expression of VEGFA mRNA and protein was unchanged. In vitro PlGF at high concentration mimicked the wound-healing actions of VEGFA on pulmonary microvascular endothelial monolayers. Low concentrations of PlGF potentiated the wound-healing actions of VEGFA while higher concentrations of PlGF were without this effect. VEGFB inhibited the wound-healing actions of VEGFA while VEGFB and PlGF together were mutually antagonistic. Conclusions VEGFB and PlGF can either inhibit or

  13. Relationship among expression of basic-fibroblast growth factor ...

    African Journals Online (AJOL)

    Relationship among expression of basic-fibroblast growth factor, MTDH/Astrocyte elevated gene-1, adenomatous polyposis coli, matrix metalloproteinase 9,and COX-2 markers with prognostic factors in prostate carcinomas.

  14. Molecular characterization of transforming growth factor-beta3

    NARCIS (Netherlands)

    Dijke, ten P.

    1991-01-01

    Normal tissue homeostasis is controlled by a critical balance of positive and negative modulators. Chapter 2 gives an overview of the molecular aspects of growth control, in particular the role of growth factors and oncogene and anti-oncogene products. Uncontrolled growth of cancer cells

  15. Advances in pubertal growth and factors influencing it: Can we increase pubertal growth?

    OpenAIRE

    Ashraf Soliman; Vincenzo De Sanctis; Rania Elalaily; Said Bedair

    2014-01-01

    Puberty is a period of development characterized by partially concurrent changes which includes growth acceleration, alteration in body composition and appearance of secondary sex characteristics. Puberty is characterized by an acceleration and then deceleration in skeletal growth. The initiation, duration and amount of growth vary considerably during the growth spurt. Pubertal growth and biological maturation are dynamic processes regulated by a variety of genetic and environmental factors. ...

  16. Gender Factors and Inclusive Economic Growth: The Silent Revolution

    Directory of Open Access Journals (Sweden)

    Laura Cabeza-García

    2018-01-01

    Full Text Available The gender factors that trigger economic growth in both high- and low-income countries were investigated in this study. To address these gender factors, four characteristic dimensions of gender inclusion were considered: education, access to the labor market, fertility, and democracy. The relationship between economic growth and gender factors was analyzed in a sample of 127 countries. Value and robustness were added to the results using dynamic models applied to panel data while accounting for endogeneity. We conclude that high fertility in women has negative effects on economic growth. However, when women have greater access to secondary education and the labor market in conditions of equality, the effects are positive. Similarly, the access of women to active political participation has significant effects on economic growth. Overall, this study helps identify which gender factors may promote inclusive economic growth, which is economic growth achieved when both men and women are incorporated in equal conditions.

  17. Vascular endothelial growth factors and angiogenesis in eye disease

    NARCIS (Netherlands)

    Witmer, A. N.; Vrensen, G. F. J. M.; van Noorden, C. J. F.; Schlingemann, R. O.

    2003-01-01

    The vascular endothelial growth factor (VEGF) family of growth factors controls pathological angiogenesis and increased vascular permeability in important eye diseases such as diabetic retinopathy (DR) and age-related macular degeneration (AMD). The purpose of this review is to develop new insights

  18. The growth of foot arches and influencing factors

    OpenAIRE

    Ferial Hadipoetro Idris

    2016-01-01

    Background Foot arches are important components for body sup- port. Foot arch deformity caused by growth abnormalities cause serious limitations in daily activities. Objectives To determine the patterns of foot arch growth, factors influencing foot arch growth, and the timing for intervention in er- rant growth patterns. Methods A cross-sectional study evaluated the foot arches of chil- dren aged 0-18 years according to age and sex. Subjects included had no evidence of...

  19. Growth factors regulate glutamine synthetase activity in ...

    African Journals Online (AJOL)

    Khaled

    2012-07-10

    Jul 10, 2012 ... affected by growth medium, carbon source, nitrogen source and sodium chloride. LB supplemented with 7% glycerol ... Abbreviations: GS, Glutamine synthetase; MSM, minimal salt medium; NB, nutrient broth medium; NF, ... glutamate and ammonia, which in turn, cells are supplied with ammonia, and their ...

  20. The impact of vascular endothelial growth factor and basic fibroblast growth factor on cardiac fibroblasts grown under altered gravity conditions

    DEFF Research Database (Denmark)

    Ulbrich, Claudia; Leder, Annekatrin; Pietsch, Jessica

    2010-01-01

    Myocardium is very sensitive to gravitational changes. During a spaceflight cardiovascular atrophy paired with rhythm problems and orthostatic intolerance can occur. The aim of this study was to investigate the impact of basic fibroblast growth factor (bFGF) and vascular endothelial growth factor...... (VEGF) on cardiac fibroblasts (CF) grown under altered gravity conditions....

  1. Bevacizumab reduces tumor targeting of antiepidermal growth factor and anti-insulin-like growth factor 1 receptor antibodies

    NARCIS (Netherlands)

    Heskamp, Sandra; Boerman, Otto C.; Molkenboer-Kuenen, Janneke D. M.; Oyen, Wim J. G.; van der Graaf, Winette T. A.; van Laarhoven, Hanneke W. M.

    2013-01-01

    Bevacizumab (antivascular endothelial growth factor [anti-VEGF]) and cetuximab (antiepidermal growth factor receptor [anti-EGFR]) are approved antibodies for treatment of cancer. However, in advanced colorectal cancer, the combination fails to improve survival. As the reason for the lack of activity

  2. Endogenous versus exogenous growth factor regulation of articular chondrocytes.

    Science.gov (United States)

    Shi, Shuiliang; Chan, Albert G; Mercer, Scott; Eckert, George J; Trippel, Stephen B

    2014-01-01

    Anabolic growth factors that regulate the function of articular chondrocytes are candidates for articular cartilage repair. Such factors may be delivered by pharmacotherapy in the form of exogenous proteins, or by gene therapy as endogenous proteins. It is unknown whether delivery method influences growth factor effectiveness in regulating articular chondrocyte reparative functions. We treated adult bovine articular chondrocytes with exogenous recombinant insulin-like growth factor-I (IGF-I) and transforming growth factor-beta1 (TGF-β1), or with the genes encoding these growth factors for endogenous production. Treatment effects were measured as change in chondrocyte DNA content, glycosaminoglycan production, and aggrecan gene expression. We found that IGF-I stimulated chondrocyte biosynthesis similarly when delivered by either exogenous or endogenous means. In contrast, exogenous TGF-β1 stimulated these reparative functions, while endogenous TGF-β1 had little effect. Endogenous TGF-β1 became more bioactive following activation of the transgene protein product. These data indicate that effective mechanisms of growth factor delivery for articular cartilage repair may differ for different growth factors. In the case of IGF-I, gene therapy or protein therapy appear to be viable options. In contrast, TGF-β1 gene therapy may be constrained by a limited ability of chondrocytes to convert latent complexes to an active form. Published 2013 by Wiley Periodicals, Inc. on behalf of the Orthopaedic Research Society. This article is a U.S. Government work and is in the public domain in the USA.

  3. Growth factors II: insuline-like growth binging proteins (GFBPs Factores de crecimiento II: factores insulinoides de crecimiento

    Directory of Open Access Journals (Sweden)

    Hilda Norha Jaramillo Londoño

    1996-03-01

    Full Text Available This review summarizes recent knowledge concerning Insulin.like growth factors I and II, with emphasis on their biochemical structure, concentrations, binding proteins, receptors, mechanisms of action, biological effects, and alterations of their concentrations in biological fluids. Se revisan los Factores Insulinoides de Crecimiento, también denominados ";Factores de Crecimiento Similares a la Insulina";, sobre los cuales se dispone de abundante información. Se sintetizan conocimientos recientes sobre dichos factores con énfasis en los siguientes aspectos: estructura bioquímica, concentraciones y sus cambios en los líquidos biológicos, proteínas fijadoras, receptores, mecanismos de acción y efectos biológicos.

  4. Epidermal growth factor in mammary glands and milk from rats

    DEFF Research Database (Denmark)

    Thulesen, J; Raaberg, Lasse; Nexø, Ebba

    1993-01-01

    Epidermal growth factor (EGF) is one of the major growth-promoting agents in milk. Using immunohistochemistry we localized EGF in the mammary glands of lactating rats to the luminal border of the secretory cells. Following proteolytic pretreatment of the histological sections, the EGF-immunoreact......Epidermal growth factor (EGF) is one of the major growth-promoting agents in milk. Using immunohistochemistry we localized EGF in the mammary glands of lactating rats to the luminal border of the secretory cells. Following proteolytic pretreatment of the histological sections, the EGF...

  5. Viability and growth of feline preantral follicles in vitro cultured with insulin growth factor and epidermal growth factor supplemented medium.

    Science.gov (United States)

    Alves, A E; Padilha-Nakaghi, L C; Pires-Butler, E A; Apparicio, M; Silva, Nam; Motheo, T F; Vicente, Wrr; Luvoni, G C

    2017-04-01

    In vitro culture of ovarian preantral follicles has emerged as a reproductive technology aimed at obtaining large amount of oocytes for in vitro embryo production. The addition of growth factors (GF) in the in vitro culture of preantral follicles of different species has provided superior results of follicular development, antrum formation and proliferation of granulosa cells. However, there are only few reports regarding the use of these factors on feline preantral follicle in vitro culture. Thus, the aim of this study was to investigate the effect of a combination of IGF-1 and EGF on in vitro viability and growth of preantral follicles and enclosed oocytes collected from domestic cats. A total of 64 follicles characterized by multilayer granulosa cells were isolated and individually cultured for 6 days (T6) in minimum essential medium supplemented with IGF-1+ EGF (100 ng/ml each) or without (control). A higher percentage of follicles were viable after culture with GF than without, and an increase in size when IGF-1+ EGF were added to the medium (170 ± 32.4 μm (T0) vs. 201 ± 22.3 μm (T6); p  .05). These data suggest that the addition of IGF-1 and EGF to the culture medium promotes the in vitro development of preantral follicles of cats. © 2016 Blackwell Verlag GmbH.

  6. Dual chain synthetic heparin-binding growth factor analogs

    Science.gov (United States)

    Zamora, Paul O [Gaithersburg, MD; Pena, Louis A [Poquott, NY; Lin, Xinhua [Plainview, NY

    2009-10-06

    The invention provides synthetic heparin-binding growth factor analogs having two peptide chains each branched from a branch moiety, such as trifunctional amino acid residues, the branch moieties separated by a first linker of from 3 to about 20 backbone atoms, which peptide chains bind a heparin-binding growth factor receptor and are covalently bound to a non-signaling peptide that includes a heparin-binding domain, preferably by a second linker, which may be a hydrophobic second linker. The synthetic heparin-binding growth factor analogs are useful as pharmaceutical agents, soluble biologics or as surface coatings for medical devices.

  7. Novel biodegradable polymers for local growth factor delivery.

    Science.gov (United States)

    Amsden, Brian

    2015-11-01

    Growth factors represent an important therapeutic protein drug class, and would benefit significantly from formulations that provide sustained, local release to realize their full clinical potential. Biodegradable polymer-based delivery platforms have been examined to achieve this end; however, formulations based on conventional polymers have yet to yield a clinical product. This review examines new polymer biomaterials that have been developed for growth factor delivery. The dosage forms are discussed in terms of their mechanism of release, the stability of the released growth factor, their method of preparation, and their potential for clinical translation. Copyright © 2015 Elsevier B.V. All rights reserved.

  8. Prognostic impact of placenta growth factor and vascular endothelial growth factor A in patients with breast cancer

    DEFF Research Database (Denmark)

    Maae, Else; Olsen, Dorte Aalund; Dahl Steffensen, Karina

    Background: Placenta growth factor (PlGF) and vascular endothelial growth factor A (VEGF-A) are angiogenic growth factors interacting competitively with the same receptors. VEGF-A is essential in both normal and pathologic conditions, but the functions of PlGF seem to be restricted to pathologic...... conditions such as ischemic heart disease, arthritis and tumor growth. Angiogenesis is a complex process with several growth factors involved. Because PlGF modulates VEGF-A responses we investigated their mutual relationship and impact on prognosis. Materials and methods: Quantitative PlGF and VEGF-A levels...... were measured in 229 tumor tissue specimen from primarily operated patients with unilateral breast cancer. Non-malignant breast tissue was also dissected near the tumor and quantitative measurements were available for 211 patients. PlGF and VEGF-A protein levels in homogenized tissue lysates were...

  9. Prognostic impact of placenta growth factor and vascular endothelial growth factor A in patients with breast cancer

    DEFF Research Database (Denmark)

    Maae, Else; Olsen, Dorte Aalund; Steffensen, Karina Dahl

    2012-01-01

    Placenta growth factor (PlGF) and vascular endothelial growth factor A (VEGF-A) are angiogenic growth factors interacting competitively with the same receptors. VEGF-A is essential in both normal and pathologic conditions, but the functions of PlGF seem to be restricted to pathologic conditions...... such as ischemic heart disease, arthritis and tumor growth. Angiogenesis is a complex process with several growth factors involved. Because PlGF modulates VEGF-A responses, we investigated their mutual relationship and impact on breast cancer prognosis. Quantitative PlGF and VEGF-A levels were measured in 229...... tumor tissue specimen from primarily operated patients with unilateral breast cancer. Non-malignant breast tissue was also dissected near the tumor and quantitative measurements were available for 211 patients. PlGF and VEGF-A protein levels in homogenized tissue lysates were analyzed using the Luminex...

  10. Insulin-like growth factor 2

    DEFF Research Database (Denmark)

    Valleh, Mehdi Vafaye; Hyttel, Poul; Rasmussen, Mikkel Aabech

    2014-01-01

    Intrinsic defects within the embryos, reflected by elevated cell death and low proliferative ability, are considered the most critical factors associated with bovine infertility. The identification of embryonic factors, which are responsible for successful embryo development, is thus critical...... in designing strategies for infertility intervention. In this experiment, the possible mechanisms involved in both blastomere proliferation and regulation of cell death were studied by analysis of relative expression patterns of IGF-II, BCL2-L1, BAK1, and HSP70 in 3 classes of morphological quality groups (e...

  11. Release kinetics of platelet-derived and plasma-derived growth factors from autologous plasma rich in growth factors.

    Science.gov (United States)

    Anitua, Eduardo; Zalduendo, Mari Mar; Alkhraisat, Mohammad Hamdan; Orive, Gorka

    2013-10-01

    Many studies have evaluated the biological effects of platelet rich plasma reporting the final outcomes on cell and tissues. However, few studies have dealt with the kinetics of growth factor delivery by plasma rich in growth factors. Venous blood was obtained from three healthy volunteers and processed with PRGF-Endoret technology to prepare autologous plasma rich in growth factors. The gel-like fibrin scaffolds were then incubated in triplicate, in a cell culture medium to monitor the release of PDGF-AB, VEGF, HGF and IGF-I during 8 days of incubation. A leukocyte-platelet rich plasma was prepared employing the same technology and the concentrations of growth factors and interleukin-1β were determined after 24h of incubation. After each period, the medium was collected, fibrin clot was destroyed and the supernatants were stored at -80°C until analysis. The growth factor delivery is diffusion controlled with a rapid initial release by 30% of the bioactive content after 1h of incubation and a steady state release when almost 70% of the growth factor content has been delivered. Autologous fibrin matrix retained almost 30% of the amount of the growth factors after 8 days of incubation. The addition of leukocytes to the formula of platelet rich plasma did not increase the concentration of the growth factors, while it drastically increased the presence of pro-inflammatory IL-1β. Further studies employing an in vitro inflammatory model would be interesting to study the difference in growth factors and pro-inflammatory cytokines between leukocyte-free and leukocyte-rich platelet rich plasma. Copyright © 2013 Elsevier GmbH. All rights reserved.

  12. An immunologic approach to induction of epidermal growth factor deficiency

    DEFF Research Database (Denmark)

    Raaberg, Lasse; Nexø, Ebba; Poulsen, Steen Seier

    1995-01-01

    Epidermal growth factor (EGF) in pharmacologic doses is able to induce growth and development in the fetus and the newborn. To investigate the opposite situation, the effects of insufficient amounts of EGF during development, we wanted to establish an in vivo model with a state of EGF deficiency....

  13. Effects of environmental factors on growth traits in Ghezel sheep ...

    African Journals Online (AJOL)

    The present study was carried out to study the effects of environmental factors on growth traits in Ghezel sheep breed. Growth related data (birth weight, weaning weight, month 6 weight, average daily gain from birth to weaning and weaning to month 6) were collected from lambs that have been born during 1994 - 2006 at ...

  14. Association of transforming growth factor-ß3 gene polymorphism ...

    African Journals Online (AJOL)

    user

    2011-03-07

    ). Expression of transforming growth factor-beta s 1-4 in chicken embryo chondrocytes and myocytes. Dev. Biol. 143: 135-. 148. Javanrouh A, Banabazi MH, Esmaeilkhanian S, Amirinia C, Seyedabadi. HR, Emrani H (2006).

  15. Gastric luminal epidermal growth factor is affected by diet

    African Journals Online (AJOL)

    , L Mapele, K 0 Awotedu ... This study looked at the associations between intragastric epidermal growth factor level, diet and ... Department of Surgery, Gloucestershire Royal Hospital, UK. AM Sammon MD, FRCS. December 2004, Vol. 94, No.

  16. Factors that determine the evolution of high-growth businesses

    Directory of Open Access Journals (Sweden)

    Oriol Amat

    2013-09-01

    Full Text Available Objective: The study herein discusses research aimed at elucidating the factors that contribute to a business’ ability to maintain high growth. Design/Methodology/Perspective: The database from the Iberian Balance Sheet Analysis System (SABI, from its initials in Spanish was used to identify 250 industrial Catalonian businesses with high growth during 2004-2007. These companies participated in a survey on strategies and management practices; in 2013, they were re-analyzed to investigate the factors that contributed to continued growth for certain companies. Contributions: Through diverse statistical techniques, business policies related to quality, innovation, internationalization and finance were shown to influence business growth and sustainability over time. Limitations of the Research: This study focuses on industrial businesses at least ten years old in Catalonia; thus, the conclusions may differ in other geographic locations and economic sectors, as well as for smaller businesses. Practical Implications: Because growth is a measure of business success, identifying variables that contribute to high growth and its sustainability is helpful for businesses that seek to adopt effective policies. Social Implications: Generating employment is one of the primary contributions by high-growth businesses. For years with high unemployment, authorities may be interested in corporate policies that strengthen high-growth businesses. Originality/Added Value: High-growth businesses have been studied throughout the world, but this is the first study to investigate the evolution of businesses after a high-growth phase.

  17. Insulin-like growth factor 1 and growth hormone in chronic liver disease

    DEFF Research Database (Denmark)

    Møller, Søren; Becker, Povl Ulrik

    1992-01-01

    mainly due to the decreased liver function. Low levels of somatomedins are also seen in patients with growth hormone (GH) insufficiency, renal impairment, and malnutrition. GH stimulates the production of IGF-1, and both are part of a negative feedback system acting on hepatic, pituitary......Somatomedins or insulin-like growth factors (IGF) are peptides synthesized in the liver. IGFs have different anabolic and metabolic actions and are important in normal growth and development. The concentration of insulin-like growth factor 1 (IGF-1) is low in patients with chronic liver disease...... function....

  18. Prognostic impact of placenta growth factor and vascular endothelial growth factor A in patients with breast cancer

    DEFF Research Database (Denmark)

    Maae, Else; Olsen, Dorte Aalund; Steffensen, Karina Dahl

    2012-01-01

    such as ischemic heart disease, arthritis and tumor growth. Angiogenesis is a complex process with several growth factors involved. Because PlGF modulates VEGF-A responses, we investigated their mutual relationship and impact on breast cancer prognosis. Quantitative PlGF and VEGF-A levels were measured in 229...

  19. Study of angiogenic factors: Vascular endothelia growth factor ...

    African Journals Online (AJOL)

    The pre-therapeutic serum levels of the angiogenic factors VEGF and bFGF were detected in the sera of HCC patients to find new markers to be used for diagnosis of HCC, and were compared with the routinely used tumor markers used for diagnosis of HCC as AFP, CEA, and CA19.9. The relation between the serum levels ...

  20. Factors affecting growth and pigmentation of Penicillium caseifulvum

    DEFF Research Database (Denmark)

    Suhr, Karin Isabel; Haasum, I.; Steenstrup, L.D.

    2002-01-01

    and the trace metals Fe, Cu, Zn, Mn on yellow color formation, metabolite production and mold growth. Multivariate statistical analysis showed that the most important factor affecting yellow color formation was pH. The most pronounced formation of yellow color, supported by highest amount of colored metabolites......, appeared at low pH (pH 4). Mold growth was not correlated to the yellow color formation. Salt concentration was the most important factor affecting mold growth and length of lag phase. Production of secondary metabolites was strongly influenced by both pH and salt concentration. The screening results were......Color formation, metabolite production and growth of Penicillium caseifulvum were studied in order to elucidate factors contributing to. yellow discoloration of Blue Cheese caused by the mold. A screening experiment was set up to study the effect of pH, concentration of salt (NaCl), P, K, N, S, Mg...

  1. Prognosis and risk factors for intrauterine growth retardation

    DEFF Research Database (Denmark)

    Sehested, Line Thousig; Pedersen, Pernille

    2014-01-01

    INTRODUCTION: Intrauterine growth retardation (IUGR) is the term describing a foetus that has not reached its genetic growth potential. There is no international consensus on the definition of IUGR. The aim of this study was to describe a cohort of weight-restricted neonates and their mothers...... factors and neonatal growth and outcome at six weeks, five months and 12 months of age were collected. RESULTS: A total of 73 neonates and their mothers were included. Caesarean delivery was given in 78% of the cases. Maternal risk factors included gestational hypertension (33%), smoking (24......%) and placental infarction (17%). Hypoglycaemic episodes developed in 31% of the neonates. At 12 months, 90% had caught up growth and 7% had a neurologically poor outcome. No infants died. CONCLUSION: Maternal smoking and gestational hypertension are important risk factors for the development of IUGR. Special...

  2. Factors affecting growth and pigmentation of Penicillium caseifulvum

    DEFF Research Database (Denmark)

    Suhr, Karin Isabel; Haasum, I.; Steenstrup, L.D.

    2002-01-01

    Color formation, metabolite production and growth of Penicillium caseifulvum were studied in order to elucidate factors contributing to. yellow discoloration of Blue Cheese caused by the mold. A screening experiment was set up to study the effect of pH, concentration of salt (NaCl), P, K, N, S, Mg...... and the trace metals Fe, Cu, Zn, Mn on yellow color formation, metabolite production and mold growth. Multivariate statistical analysis showed that the most important factor affecting yellow color formation was pH. The most pronounced formation of yellow color, supported by highest amount of colored metabolites......, appeared at low pH (pH 4). Mold growth was not correlated to the yellow color formation. Salt concentration was the most important factor affecting mold growth and length of lag phase. Production of secondary metabolites was strongly influenced by both pH and salt concentration. The screening results were...

  3. Risk Factors to Growth Retardation in Major Thalassemia

    Directory of Open Access Journals (Sweden)

    Riva Uda

    2011-03-01

    Full Text Available The increasing in the life span of patients with major thalassemia should be followed by increased quality of life. There are factors which can affect growth retardation in these patients. The aim of this study was to find out the risk factors for growth retardation in patients with major thalassemia. An analytical study with cross-sectional design was conducted at Pediatric Thalassemia Clinics of Dr.Hasan Sadikin Hospital, Bandung, in June to July 2006. The subjects of this study were patients with major thalassemia. Inclusion criteria’s were age under 14 years old, had no chronic diseases like tuberculosis, cerebral palsy with complete medical records. Risk factors were the timing of diagnosis, initial and dose of deferoxamine, volume of transfused blood, mean pretransfusion hemoglobin level, family income, and age. Antropometric measurement indices were used to assess the growth which expressed in Z score. Growth evaluated based on height/age (H/A and growth retardation if H/A <-2 SD. Risk factors for growth retardation were analyzed separately using chi-square test and odds ratio (OR with 95% confidence interval (CI. Then they were analyzed simultaneously with logistic regression method. Subjects consisted of 152 patients with major thalassemia. Seventy three thalassemia patients were stunted. Analysis showed that age (OR: 5.42, 95% CI:2.32–12.65, p <0.001, dosage of deferoxamine (OR: 4.0, 95% CI: 1.29–12.41, p: 0.016, and family income (OR: 2.32, 95% CI: 1.06–5.06, p: 0.036 were risks factors for growth retardation. Conclusion, risk factors for growth retardation in major thalassemia are age, dosage of deferoxamine, and family income.

  4. Short-latency local actions of nerve growth factor at the growth cone.

    OpenAIRE

    Seeley, P J; Greene, L A

    1983-01-01

    Cultures of neurite-bearing pheochromocytoma (PC12) cells and of sympathetic neurons have been examined by time-lapse video microscopy. In the presence of nerve growth factor (NGF), the neurites of such cultures elongated and their growth cones changed geometry, via microspike and lamellipodial motion, on a time scale of minutes. Withdrawal of NGF caused process extension to cease and a progressive reduction in growth-cone area as a result of retraction of lamellipodia and microspikes. By app...

  5. Growth factors: first part Factores de crecimiento I

    Directory of Open Access Journals (Sweden)

    Hilda Norha Jaramillo Londoño

    1996-02-01

    Full Text Available

    Los factores de crecimiento tienen como función activar o inhibir la transcripción génica; es así como la cascada enzimática que se inicia con la activación de los receptores de la membrana citoplasmática, ya sean de tipo segundo mensajero o catalíticos, tiene como efecto final la fosforilación de proteínas, las cuales pueden ser: 1 enzimas que intervienen en las vías metabólicas; 2 proteínas promotoras de la transcripción de genes o, por el contrario, represoras de los mismos (31,32; en algunos casos el efecto final consiste en la transcripción de protooncogenes (33 cuyos productos pueden ser otro factor de crecimiento o receptores para éstos (16; 3 algunos factores de crecimiento ejercen sus efectos sobre los eventos postranscripcionales y postraslacionales (23.

    Los Factores de Crecimiento, incluyendo las citoquinas, representan un número muy grande de polipéptidos, glucoproteínas y otras moléculas relacionadas. Todos ellos promueven la proliferación, la diferenciación y las funciones especializadas de casi cualquier tipo de célula. Juegan un papel importante mediando los modos paracrino, autocrino y endocrino de comunicación. En esta primera parte de una serie se definen y clasifican los factores de crecimiento; para la clasificación se proponen diversos sistemas basados en el período de desarrollo del individuo en que actúan, en el punto crítico del ciclo celular sobre el que ejercen su acción y en los efectos fisiológicos que producen; se discuten, además, someramente, la composición química, los mecanismos de acción y las funciones de estas sustancias.

  6. Minoxidil Promotes Hair Growth through Stimulation of Growth Factor Release from Adipose-Derived Stem Cells.

    Science.gov (United States)

    Choi, Nahyun; Shin, Soyoung; Song, Sun U; Sung, Jong-Hyuk

    2018-02-28

    Minoxidil directly promotes hair growth via the stimulation of dermal papilla (DP) and epithelial cells. Alternatively, there is little evidence for indirect promotion of hair growth via stimulation of adipose-derived stem cells (ASCs). We investigated whether minoxidil stimulates ASCs and if increased growth factor secretion by ASCs facilitates minoxidil-induced hair growth. Telogen-to-anagen induction was examined in mice. Cultured DP cells and vibrissae hair follicle organ cultures were used to further examine the underlying mechanisms. Subcutaneous injection of minoxidil-treated ASCs accelerated telogen-to-anagen transition in mice, and increased hair weight at day 14 post-injection. Minoxidil did not alter ASC proliferation, but increased migration and tube formation. Minoxidil also increased the secretion of growth factors from ASCs, including chemokine (C-X-C motif) ligand 1 (CXCL1), platelet-derived endothelial cell growth factor (PD-ECGF), and platelet-derived growth factor-C (PDGF-C). Minoxidil increased extracellular signal-regulated kinases 1/2 (ERK1/2) phosphorylation, and concomitant upregulation of PD-ECGF and PDGF-C mRNA levels were attenuated by an ERK inhibitor. Subcutaneous injection of CXCL1, PD-ECGF, or PDGF-C enhanced anagen induction in mice, and both CXCL1 and PDGF-C increased hair length in ex vivo organ culture. Treatment with CXCL1, PD-ECGF, or PDGF-C also increased the proliferation index in DP cells. Finally, topical application of CXCL1, PD-ECGF, or PDGF-C with 2% minoxidil enhanced anagen induction when compared to minoxidil alone. Minoxidil stimulates ASC motility and increases paracrine growth factor signaling. Minoxidil-stimulated secretion of growth factors by ASCs may enhance hair growth by promoting DP proliferation. Therefore, minoxidil can be used as an ASC preconditioning agent for hair regeneration.

  7. Increased vascular endothelial growth factor (VEGF) expression in ...

    African Journals Online (AJOL)

    Vascular endothelial growth factor (VEGF), a well known angiogenic factor, has been shown to have direct and/or indirect influence on spinal cord injury (SCI). The purpose of this study is to observe VEGF expression changes in rats with SCI by bone marrow stromal cells (BMSCs) treatment. The mRNA expression of VEGF ...

  8. Insulin-like growth factor system in amyotrophic lateral sclerosis

    NARCIS (Netherlands)

    Wilczak, N; de Keyser, J; Cianfarani, S; Clemmons, DR; Savage, MO

    2005-01-01

    Insulin-like growth factor-I (IGF-I) is a neurotrophic factor with insulin-like metabolic activities, and possesses potential clinical applications, particularly in neurodegenerative disorders. Amyotrophic lateral sclerosis (ALS) is a chronic progressive devastating disorder of the central nervous

  9. Association assessment of platelet derived growth factor B gene ...

    African Journals Online (AJOL)

    Shayesteh Rezayani

    2017-04-21

    Apr 21, 2017 ... Background: Coronary artery disease (CAD) is the most frequent cause of morbidity and mortality in the world and it is known as a multifactorial disorder which is influenced by both genetic and environmental factors. Based on different assays, the platelet derived growth factor B (PDGF-B) gene is shown to ...

  10. Cytokines and growth factors in Duchene muscular dystrophy patients

    African Journals Online (AJOL)

    Conclusion: Results provide further proof that inflammatory response is associated with DMD pathogenesis and favours the use of biomarkers in blood of such patients as a non invasive technique. Keywords:(basic fibroblast growth factor (bFGF), duchene muscular dystrophy, necrosis factor alfa (TNF TNF-α), vascular

  11. Increased vascular endothelial growth factor (VEGF) expression in ...

    African Journals Online (AJOL)

    User

    2011-05-16

    May 16, 2011 ... Vascular endothelial growth factor (VEGF), a well known angiogenic factor, has been shown to have direct and/or indirect influence on spinal cord injury (SCI). The purpose of this study is to observe. VEGF expression changes in rats with SCI by bone marrow stromal cells (BMSCs) treatment. The mRNA.

  12. Association assessment of platelet derived growth factor B gene ...

    African Journals Online (AJOL)

    Background: Coronary artery disease (CAD) is the most frequent cause of morbidity and mortality in the world and it is known as a multifactorial disorder which is influenced by both genetic and environmental factors. Based on different assays, the platelet derived growth factor B (PDGF-B) gene is shown to be amongst the ...

  13. Instability restricts signaling of multiple fibroblast growth factors

    Czech Academy of Sciences Publication Activity Database

    Buchtová, Marcela; Chaloupková, R.; Zakrzewska, M.; Veselá, I.; Celá, Petra; Barathová, J.; Gudernová, I.; Zajíčková, R.; Trantírek, L.; Martin, J.; Kostas, M.; Otlewski, J.; Damborský, J.; Kozubík, Alois; Wiedlocha, A.; Krejčí, P.

    2015-01-01

    Roč. 72, č. 12 (2015), s. 2445-2459 ISSN 1420-682X R&D Projects: GA ČR(CZ) GA14-31540S; GA ČR GBP302/12/G157 Institutional support: RVO:67985904 ; RVO:68081707 Keywords : fibroblast growth factor * FGF * unstable Subject RIV: EA - Cell Biology Impact factor: 5.694, year: 2015

  14. Insulin-like growth factor-I in growth and metabolism

    DEFF Research Database (Denmark)

    Backeljauw, P; Bang, P; Dunger, D B

    2010-01-01

    Deficiency of insulin-like growth factor-I (IGF-I) results in growth failure. A variety of molecular defects have been found to underlie severe primary IGF-I deficiency (IGFD), in which serum IGF-I concentrations are substantially decreased and fail to respond to GH therapy. Identification of mor...

  15. Cytokines and Growth Factors Expressed by Human Cutaneous Melanoma

    Directory of Open Access Journals (Sweden)

    Elias G. Elias

    2010-05-01

    Full Text Available Cytokines and growth factors have biologic effects that could stimulate tumor growth, invasion and angiogenesis. The incidence of 24 factors was investigated in 25 cultured human melanoma cell lines and in 62 fixed tissues at different stages of the disease. Over 80% of the human melanoma cell lines expressed TGF-β, IL-8, IL-6, VEGF, PDGF-AA and OPN. Significantly higher TGF-β, IGF-1 and IL-15 were determined in primary lesions compared to distant metastases by immunohistochemistry. Illustrating the complexity of the milieu of the tumor microenvironment, some of these factors may have to be considered in targeted therapy.

  16. Transcription factor control of growth rate dependent genes in Saccharomyces cerevisiae: A three factor design

    DEFF Research Database (Denmark)

    Fazio, Alessandro; Jewett, Michael Christopher; Daran-Lapujade, Pascale

    2008-01-01

    transcription factor target sets, transcription factors that coordinate balanced growth were also identified. Our analysis shows that FhII, Rap1, and Sfp1, regulating protein biosynthesis, have significantly enriched target sets for genes up-regulated with increasing growth rate. Cell cycle regulators...

  17. In situ formation of poly(vinyl alcohol–heparin hydrogels for mild encapsulation and prolonged release of basic fibroblast growth factor and vascular endothelial growth factor

    Directory of Open Access Journals (Sweden)

    Justine J Roberts

    2016-11-01

    Full Text Available Heparin-based hydrogels are attractive for controlled growth factor delivery, due to the native ability of heparin to bind and stabilize growth factors. Basic fibroblast growth factor and vascular endothelial growth factor are heparin-binding growth factors that synergistically enhance angiogenesis. Mild, in situ encapsulation of both basic fibroblast growth factor and vascular endothelial growth factor and subsequent bioactive dual release has not been demonstrated from heparin-crosslinked hydrogels, and the combined long-term delivery of both growth factors from biomaterials is still a major challenge. Both basic fibroblast growth factor and vascular endothelial growth factor were encapsulated in poly(vinyl alcohol-heparin hydrogels and demonstrated controlled release. A model cell line, BaF32, was used to show bioactivity of heparin and basic fibroblast growth factor released from the gels over multiple days. Released basic fibroblast growth factor promoted higher human umbilical vein endothelial cell outgrowth over 24 h and proliferation for 3 days than the poly(vinyl alcohol-heparin hydrogels alone. The release of vascular endothelial growth factor from poly(vinyl alcohol-heparin hydrogels promoted human umbilical vein endothelial cell outgrowth but not significant proliferation. Dual-growth factor release of basic fibroblast growth factor and vascular endothelial growth factor from poly(vinyl alcohol-heparin hydrogels resulted in a synergistic effect with significantly higher human umbilical vein endothelial cell outgrowth compared to basic fibroblast growth factor or vascular endothelial growth factor alone. Poly(vinyl alcohol-heparin hydrogels allowed bioactive growth factor encapsulation and provided controlled release of multiple growth factors which is beneficial toward tissue regeneration applications.

  18. Factors responsible for the growth of small business

    Directory of Open Access Journals (Sweden)

    JA Döckel

    2015-01-01

    Full Text Available Entrepreneurial conduct holds the key to economic growth. Thus those business that show growth and development are considered entrepreneurial, implying that SMME policy initiatives should focus on businesses with growth potential, and not the small business sector as a whole.  The success of a small business seems to depend on the intentions of the owner, together with factors associated with the ability of, and opportunity for, the specific business to grow.  The aim of this article is to make use of a multiple linear regression model to determine the variables that impact positively on business growth.  In addition to demand factors, it was established that smaller and younger businesses are the ones that grow faster. A successful business also shows a positive correlation between business management skills and entrepreneurial conduct.

  19. Balance of vascular endothelial growth factor and pigment epithelial growth factor prior to development of proliferative vitreoretinopathy

    NARCIS (Netherlands)

    Dieudonne, S.C.; Heij, La E.C.; Diederen, R.M.H.; Kessels, A.G.H.; Liem, A.T.A.; Kijlstra, A.; Hendrikse, F.

    2007-01-01

    Background: Pigment epithelium-derived factor (PEDF) and vascular endothelial growth factor (VEGF) are imbalanced in eyes with proliferative diabetic retinopathy or proliferative vitreoretinopathy (PVR). It is not known whether such an imbalance is already present in early PVR stages. We therefore

  20. Growth factors in porcine full and partial thickness burn repair. Differing targets and effects of keratinocyte growth factor, platelet-derived growth factor-BB, epidermal growth factor, and neu differentiation factor.

    Science.gov (United States)

    Danilenko, D M; Ring, B D; Tarpley, J E; Morris, B; Van, G Y; Morawiecki, A; Callahan, W; Goldenberg, M; Hershenson, S; Pierce, G F

    1995-11-01

    The topical application of recombinant growth factors such as epidermal growth factor, platelet-derived growth factor-BB homodimer (rPDGF-BB), keratinocyte growth factor (rKGF), and neu differentiation factor has resulted in significant acceleration of healing in several animal models of wound repair. In this study, we established highly reproducible and quantifiable full and deep partial thickness porcine burn models in which burns were escharectomized 4 or 5 days postburn and covered with an occlusive dressing to replicate the standard treatment in human burn patients. We then applied these growth factors to assess their efficacy on several parameters of wound repair: extracellular matrix and granulation tissue production, percent reepithelialization, and new epithelial area. In full thickness burns, only rPDGF-BB and the combination of rPDGF-BB and rKGF induced significant changes in burn repair. rPDGF-BB induced marked extracellular matrix and granulation tissue production (P = 0.013) such that the burn defect was filled within several days of escharectomy, but had no effect on new epithelial area or reepithelialization. The combination of rPDGF-BB and rKGF in full thickness burns resulted in a highly significant increase in extracellular matrix and granulation tissue area (P = 0.0009) and a significant increase in new epithelial area (P = 0.007), but had no effect on reepithelialization. In deep partial thickness burns, rKGF induced the most consistent changes. Daily application of rKGF induced a highly significant increase in new epithelial area (P < 0.0001) but induced only a modest increase in reepithelialization (83.7% rKGF-treated versus 70.2% control; P = 0.016) 12 days postburn. rKGF also doubled the number of fully reepithelialized burns (P = 0.02) at 13 days postburn, at least partially because of marked stimulation of both epidermal and follicular proliferation as assessed by proliferating cell nuclear antigen expression. In situ hybridization for

  1. Effect of β-nerve growth factor on differentiation of endothelial ...

    African Journals Online (AJOL)

    nerve growth factor. (Ad-EGFP-hβ-NGF) on ... Keywords: β-Nerve growth factor, Endothelial progenitor cells, Angiogenic growth factors, Tyrosine kinase receptor A, Cell ..... significantly improve the limb ischemic conditions. [15]. The results of ...

  2. Friends Turned Foes: Angiogenic Growth Factors beyond Angiogenesis.

    Science.gov (United States)

    Matkar, Pratiek N; Ariyagunarajah, Ramya; Leong-Poi, Howard; Singh, Krishna K

    2017-10-02

    Angiogenesis, the formation of new blood vessels from pre-existing ones is a biological process that ensures an adequate blood flow is maintained to provide the cells with a sufficient supply of nutrients and oxygen within the body. Numerous soluble growth factors and inhibitors, cytokines, proteases as well as extracellular matrix proteins and adhesion molecules stringently regulate the multi-factorial process of angiogenesis. The properties and interactions of key angiogenic molecules such as vascular endothelial growth factors (VEGFs), fibroblast growth factors (FGFs) and angiopoietins have been investigated in great detail with respect to their molecular impact on angiogenesis. Since the discovery of angiogenic growth factors, much research has been focused on their biological actions and their potential use as therapeutic targets for angiogenic or anti-angiogenic strategies in a context-dependent manner depending on the pathologies. It is generally accepted that these factors play an indispensable role in angiogenesis. However, it is becoming increasingly evident that this is not their only role and it is likely that the angiogenic factors have important functions in a wider range of biological and pathological processes. The additional roles played by these molecules in numerous pathologies and biological processes beyond angiogenesis are discussed in this review.

  3. Friends Turned Foes: Angiogenic Growth Factors beyond Angiogenesis

    Directory of Open Access Journals (Sweden)

    Pratiek N. Matkar

    2017-10-01

    Full Text Available Angiogenesis, the formation of new blood vessels from pre-existing ones is a biological process that ensures an adequate blood flow is maintained to provide the cells with a sufficient supply of nutrients and oxygen within the body. Numerous soluble growth factors and inhibitors, cytokines, proteases as well as extracellular matrix proteins and adhesion molecules stringently regulate the multi-factorial process of angiogenesis. The properties and interactions of key angiogenic molecules such as vascular endothelial growth factors (VEGFs, fibroblast growth factors (FGFs and angiopoietins have been investigated in great detail with respect to their molecular impact on angiogenesis. Since the discovery of angiogenic growth factors, much research has been focused on their biological actions and their potential use as therapeutic targets for angiogenic or anti-angiogenic strategies in a context-dependent manner depending on the pathologies. It is generally accepted that these factors play an indispensable role in angiogenesis. However, it is becoming increasingly evident that this is not their only role and it is likely that the angiogenic factors have important functions in a wider range of biological and pathological processes. The additional roles played by these molecules in numerous pathologies and biological processes beyond angiogenesis are discussed in this review.

  4. Insulin-like growth factor-I and the liver

    DEFF Research Database (Denmark)

    Bonefeld, Karen; Møller, Søren

    2011-01-01

    consequences in cirrhosis are only partly understood. Disruption of the growth hormone (GH)-IGF-I axis seems to be closely associated with the development of liver disease, and treatment with recombinant human IGF (rhIGF)-I has been shown to halt, and even reverse, the fibrotic degeneration. IGF-I in itself......Insulin-like growth factors (IGFs) play an essential role in growth and development, as well as in the overall cellular regulation and metabolism in the human body. In chronic liver disease, IGF levels are decreased, and the circulating levels correlate to the extent of hepatocellular dysfunction...

  5. Role of Transforming Growth Factor β in Uterine Fibroid Biology.

    Science.gov (United States)

    Ciebiera, Michał; Włodarczyk, Marta; Wrzosek, Małgorzata; Męczekalski, Błażej; Nowicka, Grażyna; Łukaszuk, Krzysztof; Ciebiera, Magdalena; Słabuszewska-Jóźwiak, Aneta; Jakiel, Grzegorz

    2017-11-17

    Uterine fibroids (UFs) are benign tumors of the female genital tract made of the smooth muscle of the uterus. UF growth depends mostly on the influence of the steroid hormones and selected growth factors. Transforming growth factor β (TGF-βs) is a polypeptide that consists of three isoforms: TGF-β1, TGF-β2, and TGF-β3. At present, TGF-β is considered to be one of the key factors in the pathophysiology of UFs. It plays a major role in cellular migration within the tumor, stimulates tumor growth, and enhances tumor metabolism. As a consequence of various dependencies, the synthesis and release of TGF-β in a UF tumor is increased, which results in excessive extracellular matrix production and storage. High concentrations or overexpression of TGF-β mediators may be responsible for clinically symptomatic UFs. The aim of this review was to check the available evidence for the influence of the TGF-β family on UF biology. We conducted their search in PubMed of the National Library of Medicine with the use of the following selected keywords: "uterine fibroid", "leiomyoma", and "transforming growth factor β". After reviewing the titles and abstracts, more than 115 full articles were evaluated. We focused on the TGF-β-related molecular aspects and their influence on the most common symptoms that are associated with UFs. Also, we described how the available data might implicate the current medical management of UFs.

  6. Constructing a blood vessel on the porous scaffold modified with vascular endothelial growth factor and basic fibroblast growth factor

    Science.gov (United States)

    Sevostyanova, V. V.; Matveeva, V. G.; Antonova, L. V.; Velikanova, E. A.; Shabaev, A. R.; Senokosova, E. A.; Krivkina, E. O.; Vasyukov, G. Yu.; Glushkova, T. V.; Kudryavtseva, Yu. A.; Barbarash, O. L.; Barbarash, L. S.

    2016-11-01

    Incorporation of the growth factors into biodegradable polymers is a promising approach for the fabrication of tissue-engineered vascular grafts. Here we blended poly(ɛ-caprolactone) (PCL) with poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) following incorporation of either vascular endothelial growth factor (VEGF) or basic fibroblast growth factor (bFGF) and then fabricated electrospun 2 mm diameter vascular grafts. Grafts without the growth factors were used as a control group. Structure of the grafts was assessed utilizing scanning electron microscopy. We further implanted our grafts into rat abdominal aorta for 1 and 3 months with the aim to test endothelialization, cell infiltration, and patency in vivo. Histological and immunofluorescence examination demonstrated enhanced endothelialization and cell infiltration of the grafts with either VEGF or bFGF compared to those without the growth factors. Grafts with VEGF showed higher patency compared to those with bFGF; however, bFGF promoted migration of smooth muscle cells and fibroblasts into the graft. Therefore, we conclude that incorporation of VEGF and bFGF into the inner and medial/outer layer, respectively, can be a promising option for the fabrication of tissue-engineered vascular grafts.

  7. Vascular endothelial growth factor and children featuring nasal polyps.

    Science.gov (United States)

    Hu, Ko-Hsin; Lee, Fei-Peng; Cheng, Ya-Jian; Huang, Hung-Meng

    2007-01-01

    The aim of this study is to explore the expression of vascular endothelial growth factor within nasal polyps, and the implication of such expression as regards the development of nasal polyps amongst children. Sixty children suffering from chronic rhinosinusitis were enrolled in this study. Amongst them, 30 patients featured rhinosinusitis with associated nasal polyps. A biopsy specimen was taken from the stalk or the base of the nasal polyp for nasal-polyp sufferers, and the ethmoid sinus for study participants who featured no nasal polyps. The primary lesions biopsied were immunohistochemically stained with a specific endothelial-cell marker and also stained for the presence of vascular endothelial growth factor. The specific level of vascular endothelial growth factor and the mean number of blood vessels present in a visual microscopic (biopsied-specimen) field were calculated under light microscopy (x400). The number of vascular endothelial growth factor-expressing cells for the nasal-polyp group and for the sinusitis group was, respectively, 20.8+/-4.0 and 11.5+/-3.4 per visual field. Correspondingly, the mean intra-polyp blood-vessel density for the nasal-polyp group and that for the control group was, respectively, 10.5+/-2.6 and 5.0+/-1.9 per visual field. The mean intra-polyp blood-vessel density and the number of vascular endothelial growth factor-expressing cells proved to be significantly greater amongst individuals from the nasal-polyp group than was the case for their analogs from the sinusitis group (Ppolyp tissue. In addition, the level of vascular endothelial growth-factor expression and the mean blood-vessel count per field correlated significantly for nasal-polyp tissue (Ppolyps correlated significantly with the number of (intra-polyp) vascular endothelial-cell growth factor-expressing cells and the mean blood-vessel density (Ppolyps than within corresponding sinusitis mucosa. Clinically, the expression of both of these parameters correlated well

  8. Signaling by fibroblast growth factors: the inside story.

    Science.gov (United States)

    Goldfarb, M

    2001-10-30

    Polypeptide growth factors bind to the extracellular domains of cell surface receptors, triggering activation of receptor-intrinsic or receptor-associated protein kinases. Although this central thesis is widely accepted, one family of proteins, the fibroblast growth factors (FGFs), have for more than a decade attracted a research "counterculture" looking for direct FGF actions inside cells. Goldfarb discusses how the search for alternative signaling pathways is moving mainstream with the help of two recent publications reporting specific intracellular targets for FGF and FGF-like proteins.

  9. Marked stimulation of growth and motility of human keratinocytes by hepatocyte growth factor

    International Nuclear Information System (INIS)

    Matsumoto, K.; Hashimoto, K.; Yoshikawa, K.; Nakamura, T.

    1991-01-01

    Effect of hepatocyte growth factor (HGF) on normal human epidermal keratinocytes cultured under conditions of low Ca2+ (0.1 mM, growth-promoting condition) and physiological Ca2+ (1.8 mM, differentiation-promoting condition) was investigated. In low Ca2+, HGF markedly enhanced the migration of keratinocytes while it suppressed cell growth and DNA synthesis in a dose-dependent manner. In contrast, HGF enhanced the migration, cell growth, and DNA synthesis of keratinocytes cultured under conditions of physiological Ca2+. The maximal stimulation of DNA synthesis (2.4-fold stimulation) in physiological Ca2+ was seen at 2.5-5 ng/ml HGF and the stimulatory effect of HGF was suppressed by transforming growth factor-beta 1. Analysis of the HGF receptor using 125I-HGF as a ligand showed that human keratinocytes expressed a single class of specific, saturable receptor for HGF in both low and physiological Ca2+ conditions, exhibiting a Kd = 17.3 pM and approximately 690 binding sites/cell under physiological Ca2+. Thus, HGF is a potent factor which enhances growth and migration of normal human keratinocytes under conditions of physiological Ca2+. HGF may play an important role in epidermal tissue repair as it enhances both the migration and growth of keratinocytes

  10. Cow placenta extract promotes murine hair growth through enhancing the insulin - like growth factor-1

    Directory of Open Access Journals (Sweden)

    Dongliang Zhang

    2011-01-01

    Full Text Available Background: Hair loss is seen as an irreversible process. Most research concentrates on how to elongate the anagen, reduce the negative factors of obstructing hair growth and improve the hair number and size. Aim: In our experiment, we tried to prove that the cow placenta extract can promote hair growth by elongating hair shaft and increasing hair follicle number. Materials and Methods: Cow placenta extract (CPE, water and minoxidil applied separately on the back of depilated B57CL/6 mice for the case, negative and positive control respectively. We checked the proliferation of cells which are resident in hair sheath, and the expression of a few growth factors which stimulate hair growth. Results: Result shows that placenta extract more efficiently accelerates cell division and growth factor expression, by raising the insulin-like growth factor (IGF-1 mRNA and protein level to increase HF size and hair length. Conclusions: The extract is not a purified product; so, it is less effective than minoxidil, which is approved by the US FDA for the treatment of male pattern baldness. If refinement is done, the placenta extract would be a good candidate medicine for hair loss.

  11. Cheiradone: a vascular endothelial cell growth factor receptor antagonist

    Directory of Open Access Journals (Sweden)

    Ahmed Nessar

    2008-01-01

    Full Text Available Abstract Background Angiogenesis, the growth of new blood vessels from the pre-existing vasculature is associated with physiological (for example wound healing and pathological conditions (tumour development. Vascular endothelial growth factor (VEGF, fibroblast growth factor-2 (FGF-2 and epidermal growth factor (EGF are the major angiogenic regulators. We have identified a natural product (cheiradone isolated from a Euphorbia species which inhibited in vivo and in vitro VEGF- stimulated angiogenesis but had no effect on FGF-2 or EGF activity. Two primary cultures, bovine aortic and human dermal endothelial cells were used in in vitro (proliferation, wound healing, invasion in Matrigel and tube formation and in vivo (the chick chorioallantoic membrane models of angiogenesis in the presence of growth factors and cheiradone. In all cases, the concentration of cheiradone which caused 50% inhibition (IC50 was determined. The effect of cheiradone on the binding of growth factors to their receptors was also investigated. Results Cheiradone inhibited all stages of VEGF-induced angiogenesis with IC50 values in the range 5.20–7.50 μM but did not inhibit FGF-2 or EGF-induced angiogenesis. It also inhibited VEGF binding to VEGF receptor-1 and 2 with IC50 values of 2.9 and 0.61 μM respectively. Conclusion Cheiradone inhibited VEGF-induced angiogenesis by binding to VEGF receptors -1 and -2 and may be a useful investigative tool to study the specific contribution of VEGF to angiogenesis and may have therapeutic potential.

  12. Altered expression of platelet factor 4 and basic fibroblast growth factor correlates with the inhibition of tumor growth in mice.

    Science.gov (United States)

    Mabeta, Peace; Pepper, Michael S

    2015-02-01

    Herein, we describe the effects of Taxol on endothelioma cell growth and migration in vitro and on vascular tumor growth in vivo. The effects of Taxol on endothelioma cell growth were determined using the crystal violet assay, while cell migration was measured using the xCELLIgence Real-Time Cell Analysis system. To study the effects of Taxol on tumor growth, mice were inoculated with endothelioma cells to induce vascular tumor development and were treated with the drug. At termination, tissue samples from Taxol-treated and control mice were stained with hematoxylin and eosin for histological examination, while blood samples were collected for hematological analysis, as well as for the analysis of the expression of angiogenic markers. In vitro, Taxol inhibited cell growth and migration. The drug also inhibited vascular tumor growth in mice, and this correlated with a recovery of mice from thrombocytopenia. Array analysis of blood samples from mice revealed that there was an increase in the expression of platelet factor 4 and a suppression of the proangiogenic molecule basic fibroblast growth factor in Taxol-treated animals. Our findings suggest that Taxol may have potential in the treatment of vascular tumors. Copyright © 2014 Elsevier Masson SAS. All rights reserved.

  13. Vascular endothelial growth factors: A comparison between invertebrates and vertebrates.

    Science.gov (United States)

    Kipryushina, Yulia O; Yakovlev, Konstantin V; Odintsova, Nelly A

    2015-12-01

    This review aims to summarize recent data concerning the structure and role of the members of the vascular endothelial growth factor (VEGF) and vascular endothelial growth factor receptor (VEGFR) families in the context of early development, organogenesis and regeneration, with a particular emphasis on the role of these factors in the development of invertebrates. Homologs of VEGF and/or VEGFR have been found in all Eumetazoa, in both Radiata and Bilateria, where they are expressed in the descendants of different germ layers and play a pivotal role in the development of animals with and without a vascular system. VEGF is a well-known angiogenesis regulator, but this factor also control cell migration during neurogenesis and the development of branching organs (the trachea) in invertebrate and vertebrate species. A possible explanation for the origin of Vegf/Vegfr in the animal kingdom and a pathway of Vegf/Vegfr evolution are discussed. Copyright © 2015 Elsevier Ltd. All rights reserved.

  14. Prognosis and risk factors for intrauterine growth retardation

    DEFF Research Database (Denmark)

    Sehested, Line Thousig; Pedersen, Pernille

    2014-01-01

    focusing on risk factors, catch up and neonatal outcome. MATERIAL AND METHODS: This was a retrospective descriptive study of IUGR neonates with a birth weight below 70% of the expected whose mothers were admitted to the Neonatal Ward at Hvidovre Hospital during 2007-2009. Obstetrical and maternal risk...... factors and neonatal growth and outcome at six weeks, five months and 12 months of age were collected. RESULTS: A total of 73 neonates and their mothers were included. Caesarean delivery was given in 78% of the cases. Maternal risk factors included gestational hypertension (33%), smoking (24......%) and placental infarction (17%). Hypoglycaemic episodes developed in 31% of the neonates. At 12 months, 90% had caught up growth and 7% had a neurologically poor outcome. No infants died. CONCLUSION: Maternal smoking and gestational hypertension are important risk factors for the development of IUGR. Special...

  15. The role of macrophage derived growth factors in pulmonary fibrosis

    International Nuclear Information System (INIS)

    Pickrell, J.A.; Jarpe, M.; Benson, J.M.; Henderson, R.F.

    1988-01-01

    Factors released from rat alveolar macrophages exposed to high (95 μg/mL) concentrations of the fibrogenic agent, nickel subsulfide, were found to inhibit the proliferation of cultured lung epithelial cells and stimulate the growth of fibroblasts. Such factors, if present in the alveoli of rats exposed by inhalation to nickel subsulfide in vivo, may play a role in inhibiting re-epithelization of nickel-damaged lungs and in stimulating fibroblast proliferation, leading to pulmonary fibrosis. (author)

  16. Studies on the Age, Growth and Condition Factor of Clarias ...

    African Journals Online (AJOL)

    ... 0.99) and highly significant (p<0.001). Condition factor values 'k' ranged from 0.80 to 0.95 (C. agboyiensis), 0.72 to 0.89 (C. Buthupogon), 0.65 to 0.91 (C. macromystax) and 0.57 to 0.91 (C. albopunctatus). Keywords:age, growth, condition factor, Clarias (Clarioides), Epie creek floodplain. Tropical Freshwater Biology Vol.

  17. Fibroblast growth factor signaling in embryonic and cancer stem cells

    Czech Academy of Sciences Publication Activity Database

    Dvořák, Petr; Dvořáková, D.; Hampl, Aleš

    2006-01-01

    Roč. 580, - (2006), s. 2869-2874 ISSN 0014-5793 R&D Projects: GA MŠk 1M0538; GA ČR GA301/03/1122 Institutional research plan: CEZ:AV0Z50390512 Keywords : Fibroblast growth factor 2 * Embryonic stem cell * Hematopoietic progenitor cell Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 3.372, year: 2006

  18. Growth/differentiation factor-15: prostate cancer suppressor or promoter?

    Czech Academy of Sciences Publication Activity Database

    Vaňhara, P.; Hampl, A.; Kozubík, Alois; Souček, Karel

    2012-01-01

    Roč. 15, č. 4 (2012), s. 320-328 ISSN 1365-7852 R&D Projects: GA MZd NS9600; GA MZd NS9956 Institutional research plan: CEZ:AV0Z50040702 Institutional support: RVO:68081707 Keywords : MACROPHAGE-INHIBITORY CYTOKINE-1 * GROWTH-DIFFERENTIATION FACTOR-15 * TGF-BETA SUPERFAMILY Subject RIV: BO - Biophysics Impact factor: 2.811, year: 2012

  19. Distribution and number of epidermal growth factor receptors in skin is related to epithelial cell growth

    DEFF Research Database (Denmark)

    Green, M R; Basketter, D A; Couchman, J R

    1983-01-01

    receptors are detected on the epithelial cells overlying the basement membranes of the epidermis, sebaceous gland, and regions of the hair follicle all of which have proliferative capacity. In marked contrast, tissues which have started to differentiate and lost their growth potential, carry either......Epidermal growth factor (EGF), a low-molecular-weight polypeptide (G. Carpenter and S. Cohen, 1979, Annu. Rev. Biochem. 48, 193-216), stimulates the proliferation and keratinisation of cultured embryonic epidermis (S. Cohen, 1965, Dev. Biol. 12, 394-407) and promotes epidermal growth, thickening......, and keratinisation when injected into neonatal mice (S. Cohen and G.A. Elliott, 1963, J. Invest. Dermatol, 40, 1-5). We have determined the distribution of the available receptors for epidermal growth factor in rat skin using autoradiography following incubation of explants with 125I-labelled mouse EGF. EGF...

  20. Auxins as one of the factors of plant growth improvement by plant growth promoting rhizobacteria.

    Science.gov (United States)

    Ahmed, Ambreen; Hasnain, Shahida

    2014-01-01

    Plant growth promoting rhizobacteria (PGPR) promote plant growth by various mechanisms such as phytohormone production, enhanced water and nutrient uptake, improved nitrogen availability in the soil, production of ACC-deaminase for ethylene breakdown, phosphate solubilization, siderophore production etc. Microbial auxin production is the major factor not only responsible for strengthening the plant-microbe relationship but it also promotes plant growth and development in a positive manner. Thus, bacterial auxin production potential can be exploited for plant growth improvement that may be effective in reducing the hazardous effects of chemical fertilizers on the ecosystem used to obtain higher yields. The present review gives a better understanding of various factors and mechanisms involved in auxin production by PGPR that may be helpful in proper exploitation of these natural resources in a beneficial way.

  1. A comparison of the effect of epidermal growth factor, platelet-derived growth factor, and fibroblast growth factor on rat periodontal ligament fibroblast-like cells' DNA synthesis and morphology

    DEFF Research Database (Denmark)

    Blom, S; Holmstrup, P; Dabelsteen, Erik

    1994-01-01

    in the wound-healing process. We have therefore investigated the mitogenic and morphogenic effects of recombinant epidermal growth factor (rEGF), natural platelet-derived growth factor (nPDGF), and natural fibroblast growth factor (nFGF) on periodontal ligament fibroblast-like cells. A cell line...

  2. Chronic administration of epidermal growth factor to pigs induces growth, especially of the urinary tract with accumulation of epithelial glycoconjugates

    DEFF Research Database (Denmark)

    Vinter-Jensen, Lars; Juhl, C O; Poulsen, Steen Seier

    1995-01-01

    Epidermal growth factor (EGF) receptor hyperstimulation induced by systemically administered EGF or by the development of transgenic mice overexpressing transforming growth factor alpha (TGF alpha) or other EGF-related ligands is known to induce various effects, such as acceleration...

  3. Plasma transforming growth factor beta levels in breast cancer patients

    NARCIS (Netherlands)

    Sminia, P; Barten, AD; Van Waarde, MAWH; Vujaskovic, Z; Van Tienhoven, G

    1998-01-01

    We investigated whether the concentration of circulating transforming growth factor beta (TGF beta) yields diagnostic value in breast cancer. Blood was collected from twenty stage I and II breast cancer patients both prior to treatment and after surgical excision of the tumour. Both latent and

  4. Plasma transforming growth factor beta levels in breast cancer patients

    NARCIS (Netherlands)

    Sminia, P.; Barten, A. D.; van Waarde, M. A.; Vujaskovic, Z.; van Tienhoven, G.

    1998-01-01

    We investigated whether the concentration of circulating transforming growth factor beta (TGFbeta) yields diagnostic value in breast cancer. Blood was collected from twenty stage I and II breast cancer patients both prior to treatment and after surgical excision of the tumour. Both latent and active

  5. Effects of several physiochemical factors on cell growth and gallic ...

    African Journals Online (AJOL)

    The production of gallic acid in cell suspension culture of Acer ginnala Maxim was studied. Some physiochemical factors and chemical substances effect on the cell growth and the production of gallic acid were investigated. Cells harvested from plant tissue culture were extracted and applied to high performance liquid ...

  6. Increased vascular endothelial growth factor (VEGF) expression in ...

    African Journals Online (AJOL)

    User

    2011-05-16

    May 16, 2011 ... Key words: Vascular endothelial growth factor (VEGF), spinal cord injury, bone marrow stromal cells, reverse ..... Wrigley PJ, Press SR, Gustin SM, Macefield VG (2009). Neuropathic pain and primary somatosensory cortex reorganization following spinal cord injury. Pain, 141: 52-59. Yano S, Kuroda S, Lee ...

  7. The effect of vascular endothelial growth factor-1 expression on ...

    African Journals Online (AJOL)

    Colorectal cancer is third leading cause of cancer mortality. About 60% of patients had already developed metastasis at the time of diagnosis. Vascular endothelial growth factor (VEGF) is crucial for the development of neovascularization and hence metastasis. This study aimed at investigating the relation between the ...

  8. Growth pattern, condition factor and heavy metal concentration in ...

    African Journals Online (AJOL)

    The growth pattern, condition factor and heavy metals concentrations in tissues of Sarotherodon melanotheron from Lagos Lagoon were investigated from April to July 2013. The Lagos Lagoon has been under intensified pollution, which affects fish and poses a public health risk. The size of the 55 specimens of S.

  9. Circulating vascular endothelial growth factor during the normal menstrual cycle

    NARCIS (Netherlands)

    Kusumanto, YH; Hospers, GAP; Sluiter, WJ; Dam, WA; Meijer, C; Mulder, NH

    2004-01-01

    Background: The purpose of the study was to investigate whether cycle-related variations in circulating Vascular Endothelial Growth Factor (VEGF) levels would increase the metastatic potential at specific times during the menstrual cycle. Materials and Methods: VEGF levels in serum and whole blood

  10. Fibroblast Growth Factor-2 Alters the Nature of Extinction

    Science.gov (United States)

    Graham, Bronwyn M.; Richardson, Rick

    2011-01-01

    These experiments examined the effects of the NMDA-receptor (NMDAr) antagonist MK801 on reacquisition and re-extinction of a conditioned fear that had been previously extinguished before injection of fibroblast growth factor-2 (FGF2) or vehicle. Recent findings have shown that relearning and re-extinction, unlike initial learning and extinction,…

  11. Pattern of hormone receptors and human epidermal growth factor ...

    African Journals Online (AJOL)

    Introduction: Breast cancer is the most common cancer among women globally. With immunohistochemistry (IHC), breast cancer is classified into four groups based on IHC profile of estrogen receptor (ER)/progesterone receptor (PR) and human epidermal growth factor receptor 2 (HER2/neu) expression, positive (+) and/or ...

  12. Expression and Function of Transforming Growth Factor beta in Melioidosis

    NARCIS (Netherlands)

    Weehuizen, Tassili A. F.; Wieland, Catharina W.; van der Windt, Gerritje J. W.; Duitman, Jan-Willem; Boon, Louis; Day, Nicholas P. J.; Peacock, Sharon J.; van der Poll, Tom; Wiersinga, W. Joost

    2012-01-01

    Melioidosis, caused by the Gram-negative bacterium Burkholderia pseudomallei, is an important cause of community-acquired sepsis in Southeast Asia and northern Australia. An important controller of the immune system is the pleiotropic cytokine transforming growth factor beta (TGF-beta), of which

  13. Production Of Some Virulence Factors Under Different Growth ...

    African Journals Online (AJOL)

    The production of some virulence factors under different growth conditions and antibiotic susceptbility pattern of Aeromonas hydrophila were investigated in this sudy. The virulence actors tested on the isolates included haemolytic activity, exopolysaccharide (capsule) and toxin production. Other cell property evaluated was ...

  14. Effect of Feed Cycling on Specific Growth Rate, Condition Factor ...

    African Journals Online (AJOL)

    Devika

    rate and condition factor when transferred to re- feeding after 21 days of starvation and this response was same at different acclimation temperatures at 4,. 20, and 27 0C (Van Dijk et al., 2005). Wu et al. (2003) found that three spined sticklebacks,. Gasterosteus aculcatus showed sufficient growth compensation to recover ...

  15. Transient expression of acidic fibroblast growth factor in pea (Pisum ...

    African Journals Online (AJOL)

    Yomi

    2012-03-15

    Mar 15, 2012 ... Nowadays, there are many therapeutic proteins produced in different host plants in transient easy to perform, short production cycle, efficient and inexpensive. In this study, the modified pea early browning virus (PEBV) vector containing GFP and acidic fibroblast growth factor (aFGF) was introduced into pea ...

  16. Transient expression of acidic fibroblast growth factor in pea ( Pisum ...

    African Journals Online (AJOL)

    Nowadays, there are many therapeutic proteins produced in different host plants in transient easy to perform, short production cycle, efficient and inexpensive. In this study, the modified pea early browning virus (PEBV) vector containing GFP and acidic fibroblast growth factor (aFGF) was introduced into pea plants by leave ...

  17. Protective Effect of Modified Human Acidic Fibroblast Growth Factor ...

    African Journals Online (AJOL)

    Purpose: To investigate whether modified acidic fibroblast growth factor (MaFGF) can protect NRK52E cell against apoptotic death induced by actinomycin D (Act D) and the effect of MaFGF on PI3K/Akt signaling pathway. Methods: NRK52E cell apoptotic death was measured by several methods including cell morphologic ...

  18. The role of neoangiogenesis and vascular endothelial growth factor ...

    African Journals Online (AJOL)

    2015-10-28

    Oct 28, 2015 ... neoangiogenesis, and VEGF expression has an important role frequently CTS occurrence in diabetic patients. Our ... Deger, et al.: Neoangiogenesis and vascular endothelial growth factor expression in the diabetic carpal tunnel sydrome. 190 .... In all of the immunohistochemical studies, micro polymer ...

  19. Gastric luminal epidermal growth factor is affected by diet | Iputo ...

    African Journals Online (AJOL)

    Objective. Diet is an area of major interest to those investigating the causes of cancer of the oesophagus in the Transkei. This study looked at the associations between intragastric epidermal growth factor level, diet and intragastric pH. Setting and subjects. A dietary survey was co-ordinated with studies of gastric luminal ...

  20. The epidermal growth factor receptor pathway in chronic kidney diseases

    NARCIS (Netherlands)

    Harskamp, Laura R.; Gansevoort, Ron T.; Goor, van Harry; Meijer, Esther

    The epidermal growth factor receptor (EGFR) pathway has a critical role in renal development, tissue repair and electrolyte handling. Numerous studies have reported an association between dysregulation of this pathway and the initiation and progression of various chronic kidney diseases such as

  1. Evaluation of BCL-2 and transforming growth factor alpha ...

    African Journals Online (AJOL)

    Evaluation of BCL-2 and transforming growth factor alpha oncoproteins in patients with chronic hepatitis C infection: impact on hepatocellular carcinoma. Mahmoud I Hassan, Amal Abou El Fadle, Gamal M Kenawy, Fayda I Abdel Motaleb, Fatma M AbdelSalam ...

  2. serum transforming growth factor b1 and prostate

    African Journals Online (AJOL)

    rum marker for prostate cancer, its low speci- ficity for the detection of prostate cancer, es- pecially in the grey zone of PSA, is a problem1. Therefore, more effective tumor markers for prostate cancer are being sought. A potential candidate marker is the transforming growth factor beta (TGF-B). TGF-l31 has gained con-.

  3. Insulin infusion reduces hepatocyte growth factor in lean humans

    DEFF Research Database (Denmark)

    de Courten, Barbora; de Courten, Maximilian; Dougherty, Sonia

    2013-01-01

    OBJECTIVE: Plasma Hepatocyte Growth Factor (HGF) is significantly elevated in obesity and may contribute to vascular disease, metabolic syndrome or cancer in obese individuals. The current studies were done to determine if hyperinsulinemia increases plasma HGF. MATERIALS/METHODS: Twenty-two parti...

  4. Association between Insulin Like Growth Factor-1 (IGF-1) gene ...

    African Journals Online (AJOL)

    The insulin-like growth factor-1 (IGF1) is a key regulator of muscle development and metabolism in birds and other vertebrate. Our objective was to determine the association between IGF1 gene polymorphism and carcass traits in FUNAAB Alpha chicken. Genomic DNA was extracted from the blood of 50 normal feathered ...

  5. Nerve Growth Factor in Cancer Cell Death and Survival

    International Nuclear Information System (INIS)

    Molloy, Niamh H.; Read, Danielle E.; Gorman, Adrienne M.

    2011-01-01

    One of the major challenges for cancer therapeutics is the resistance of many tumor cells to induction of cell death due to pro-survival signaling in the cancer cells. Here we review the growing literature which shows that neurotrophins contribute to pro-survival signaling in many different types of cancer. In particular, nerve growth factor, the archetypal neurotrophin, has been shown to play a role in tumorigenesis over the past decade. Nerve growth factor mediates its effects through its two cognate receptors, TrkA, a receptor tyrosine kinase and p75 NTR , a member of the death receptor superfamily. Depending on the tumor origin, pro-survival signaling can be mediated by TrkA receptors or by p75 NTR . For example, in breast cancer the aberrant expression of nerve growth factor stimulates proliferative signaling through TrkA and pro-survival signaling through p75 NTR . This latter signaling through p75 NTR promotes increased resistance to the induction of cell death by chemotherapeutic treatments. In contrast, in prostate cells the p75 NTR mediates cell death and prevents metastasis. In prostate cancer, expression of this receptor is lost, which contributes to tumor progression by allowing cells to survive, proliferate and metastasize. This review focuses on our current knowledge of neurotrophin signaling in cancer, with a particular emphasis on nerve growth factor regulation of cell death and survival in cancer

  6. Growth differentiation factor 9 gene variants in Sudanese desert ...

    African Journals Online (AJOL)

    Certain variants in the growth differentiation factor 9 (GDF9) gene have major effects on the ovulation rate in sheep. The aim of this study was to analyse GDF9 variability in the Sudanese desert sheep ecotypes Ashgar, Dubasi and Watish, and to test identified variants for association with litter size. For this purpose, ewes of ...

  7. Transforming growth factor-beta: possible roles in Dupuytren's contracture

    NARCIS (Netherlands)

    Kloen, P.; Jennings, C. L.; Gebhardt, M. C.; Springfield, D. S.; Mankin, H. J.

    1995-01-01

    Transforming growth factor-beta (TGF-beta) is a multifunctional polypeptide that stimulates extracellular matrix deposition and fibroblast proliferation. Because both these features characterize Dupuytren's contracture, we investigated a possible role for TGF-beta in the etiology of this disorder.

  8. The role of neoangiogenesis and vascular endothelial growth factor ...

    African Journals Online (AJOL)

    The role of neoangiogenesis and vascular endothelial growth factor in the development of carpal tunnel syndrome in patients with diabetes. ... Objective: Carpal tunnel syndrome (CTS) is an entrapment neuropathy which is caused by the disruption of blood supply in the median nerve under transverse carpal ligament.

  9. Influence of bioregion and environmental factors on the growth, size ...

    African Journals Online (AJOL)

    The extent of the effects of the combined influences of environmental factors on cow productivity depended on the physiological stage of animal growth and reproduction. Environmental effects on production efficiency were buffered by maternal effects at birth, but became more significant after weaning (9%) to yearling age ...

  10. Regulation of mechano growth factor in skeletal muscle and heart

    NARCIS (Netherlands)

    Ottens, M.

    2010-01-01

    The mechano growth factor (MGF) is expressed in mechanically overloaded skeletal muscle. MGF was discovered in 1996 as an alternative splice product of the IGF-1 gene. Since then, its significance has been investigated particularly in skeletal muscle, because the local expression of MGF could

  11. Controlled growth factor release from synthetic extracellular matrices

    Science.gov (United States)

    Lee, Kuen Yong; Peters, Martin C.; Anderson, Kenneth W.; Mooney, David J.

    2000-12-01

    Polymeric matrices can be used to grow new tissues and organs, and the delivery of growth factors from these matrices is one method to regenerate tissues. A problem with engineering tissues that exist in a mechanically dynamic environment, such as bone, muscle and blood vessels, is that most drug delivery systems have been designed to operate under static conditions. We thought that polymeric matrices, which release growth factors in response to mechanical signals, might provide a new approach to guide tissue formation in mechanically stressed environments. Critical design features for this type of system include the ability to undergo repeated deformation, and a reversible binding of the protein growth factors to polymeric matrices to allow for responses to repeated stimuli. Here we report a model delivery system that can respond to mechanical signalling and upregulate the release of a growth factor to promote blood vessel formation. This approach may find a number of applications, including regeneration and engineering of new tissues and more general drug-delivery applications.

  12. Effects of recombinant human nerve growth factor on cervical cancer

    African Journals Online (AJOL)

    Jane

    2011-07-25

    Jul 25, 2011 ... systems. However, the roles of NGF to cervical cancer remain deeply unknown. This study investigated the effect of recombinant human nerve growth factor ... In addition, the immune abilities of thymus and spleen were improved by rhNGF. Finally ... polypeptide neurotrophin, plays a crucial role in the life of.

  13. Epidermal growth factor receptor expression in urinary bladder cancer

    Directory of Open Access Journals (Sweden)

    Dayalu S.L. Naik

    2011-01-01

    Full Text Available Objective : To evaluate the expression pattern of epidermal growth factor receptor (EGFR in urinary bladder cancer and its association with human epidermal growth factor receptor 2 (HER2, epidermal growth factor (EGF, interleukin-6 (IL-6, and high risk human papilloma virus (HPV types 16 and 18. Materials and Methods : Thirty cases of urothelial carcinoma were analyzed. EGFR, HER2, EGF, and IL-6 expressions in the tissue were evaluated by immunohistochemical staining. For HPV, DNA from tissue samples was extracted and detection of HPV was done by PCR technique. Furthermore, evaluation of different intracellular molecules associated with EGFR signaling pathways was performed by the western blot method using lysates from various cells and tissues. Results : In this study, the frequencies of immunopositivity for EGFR, HER2, EGF, and IL-6 were 23%, 60%, 47%, and 80%, respectively. No cases were positive for HPV-18, whereas HPV-16 was detected in 10% cases. Overall, expression of EGFR did not show any statistically significant association with the studied parameters. However, among male patients, a significant association was found only between EGFR and HER2. Conclusions : Overexpression of EGFR and/or HER2, two important members of the same family of growth factor receptors, was observed in a considerable proportion of cases. Precise knowledge in this subject would be helpful to formulate a rational treatment strategy in patients with urinary bladder cancer.

  14. Epidermal growth factor receptor: Target for delivery and silencing

    NARCIS (Netherlands)

    Santos Oliveira, S.|info:eu-repo/dai/nl/304841455

    2008-01-01

    Epidermal growth factor receptor in cancer therapy Recently, cancer research has been able to identify molecular targets that are specific for (or highly expressed by) cancer cells. These molecular targets serve as models for the development of rationally designed anticancer drugs that target

  15. Renal expression of vascular endothelial growth factor in lupus ...

    African Journals Online (AJOL)

    Background: Vascular endothelial growth factor (VEGF) plays a crucial role in preservation of renal functions and may also serve as a useful biomarker in monitoring the progression of lupus nephritis (LN). Objective: We thought to correlate VEGF expression in the kidney with renal histopathology in lupus nephritis to unveil ...

  16. High level expression of human basic fibroblast growth factor in ...

    African Journals Online (AJOL)

    High level expression of human basic fibroblast growth factor in Escherichia coli : Evaluating the effect of the GC content and rare codons within the first 13 codons. ... Nterminally modified genes were PCR amplified and cloned into the expression vector, pET-22b. Meanwhile, wild-type gene remarkably expressed in all the ...

  17. The effect of vascular endothelial growth factor-1 expression on ...

    African Journals Online (AJOL)

    Riyad Bendardaf

    2017-02-28

    Feb 28, 2017 ... The effect of vascular endothelial growth factor-1 expression on survival of advanced colorectal cancer patients. Riyad Bendardafa,b, Ahmed El-Serafib,c, Kari Syrjänend, Yrjö Colland and Seppo Pyrhönend. aDepartment of Medical Oncology, University Sharjah Hospital, Sharjah, United Arab Emirates; ...

  18. Protective Effect of Modified Human Acidic Fibroblast Growth Factor ...

    African Journals Online (AJOL)

    HP

    Purpose: To investigate whether modified acidic fibroblast growth factor (MaFGF) can protect NRK52E cell against apoptotic death induced by actinomycin D (Act D) and the effect of MaFGF on PI3K/Akt signaling pathway. Methods: NRK52E cell apoptotic death was measured by several methods including cell morphologic.

  19. Chenodeoxycholic acid stimulated fibroblast growth factor 19 response

    DEFF Research Database (Denmark)

    Borup, C; Wildt, S; Rumessen, J J

    2017-01-01

    BACKGROUND: Bile acid diarrhoea is underdiagnosed and better diagnostic tests are needed. Fasting serum fibroblast growth factor-19 (FGF19) has insufficient diagnostic value, but this may be improved by stimulation. AIM: To explore if an impaired FGF19 response identifies primary bile acid...

  20. Fibroblast Growth Factors Stimulate Hair Growth through β-Catenin and Shh Expression in C57BL/6 Mice

    Science.gov (United States)

    Lin, Wei-hong; Xiang, Li-Jun; Shi, Hong-Xue; Zhang, Jian; Jiang, Li-ping; Cai, Ping-tao; Lin, Zhen-Lang; Lin, Bei-Bei; Huang, Yan; Zhang, Hai-Lin; Fu, Xiao-Bing; Guo, Ding-Jiong; Li, Xiao-Kun; Wang, Xiao-Jie; Xiao, Jian

    2015-01-01

    Growth factors are involved in the regulation of hair morphogenesis and cycle hair growth. The present study sought to investigate the hair growth promoting activities of three approved growth factor drugs, fibroblast growth factor 10 (FGF-10), acidic fibroblast growth factor (FGF-1), and basic fibroblast growth factor (FGF-2), and the mechanism of action. We observed that FGFs promoted hair growth by inducing the anagen phase in telogenic C57BL/6 mice. Specifically, the histomorphometric analysis data indicates that topical application of FGFs induced an earlier anagen phase and prolonged the mature anagen phase, in contrast to the control group. Moreover, the immunohistochemical analysis reveals earlier induction of β-catenin and Sonic hedgehog (Shh) in hair follicles of the FGFs-treated group. These results suggest that FGFs promote hair growth by inducing the anagen phase in resting hair follicles and might be a potential hair growth-promoting agent. PMID:25685806

  1. Growth and Growth hormone - Insulin Like Growth Factor -I (GH-IGF-I) Axis in Chronic Anemias.

    Science.gov (United States)

    Soliman, Ashraf T; De Sanctis, Vincenzo; Yassin, Mohamed; Adel, Ashraf

    2017-04-28

    Anaemia is a global public health problem affecting both developing and developed countries with major consequences for human health as well as social and economic development. It occurs at all stages of the life cycle, but is more prevalent in pregnant women and young children. Iron deficiency anaemia (IDA) was considered to be among the most important contributing factors to the global burden of disease. Prolonged and/or chronic anemia has a negative effect on linear growth especially during the rapid phases (infancy and puberty). Additionally infants with chronic IDA have delayed cognitive, motor, and affective development that may be long-lasting. In view of the significant impact of chronic anemias on growth, pediatricians endocrinologists and hematologists should advocate primary prevention and screening for growth disturbance in these forms of anemias. The extent of the negative effect of different forms of chronic anemias on linear growth and its possible reversibilty is addressed in this review. The possible mechanisms that may impair growth in the different forms of anemias are addressed with special attention to their effect on the growth hormone (GH) - insulin like growth factor -I (IGF-I).

  2. Gelatin Methacrylate Microspheres for Growth Factor Controlled Release

    Science.gov (United States)

    Nguyen, Anh H.; McKinney, Jay; Miller, Tobias; Bongiorno, Tom; McDevitt, Todd C.

    2014-01-01

    Gelatin has been commonly used as a delivery vehicle for various biomolecules for tissue engineering and regenerative medicine applications due to its simple fabrication methods, inherent electrostatic binding properties, and proteolytic degradability. Compared to traditional chemical cross-linking methods, such as the use of glutaraldehyde (GA), methacrylate modification of gelatin offers an alternative method to better control the extent of hydrogel cross-linking. Here we examined the physical properties and growth factor delivery of gelatin methacrylate (GMA) microparticles formulated with a wide range of different cross-linking densities (15–90%). Less methacrylated MPs had decreased elastic moduli and larger mesh sizes compared to GA MPs, with increasing methacrylation correlating to greater moduli and smaller mesh sizes. As expected, an inverse correlation between microparticle cross-linking density and degradation was observed, with the lowest cross-linked GMA MPs degrading at the fastest rate, comparable to GA MPs. Interestingly, GMA MPs at lower cross-linking densities could be loaded with up to a 10-fold higher relative amount of growth factor over conventional GA cross-linked MPs, despite an order of magnitude greater gelatin content of GA MPs. Moreover, a reduced GMA cross-linking density resulted in more complete release of bone morphogenic protein 4 (BMP4) and basic fibroblast growth factor (bFGF) and accelerated release rate with collagenase treatment. These studies demonstrate that GMA MPs provide a more flexible platform for growth factor delivery by enhancing the relative binding capacity and permitting proteolytic degradation tunability, thereby offering a more potent controlled release system for growth factor delivery. PMID:25463489

  3. Steady impact factor growth for MDPI open access journals.

    Science.gov (United States)

    Thiesen, Alexander

    2012-09-12

    For the past three years MDPI has announced the newly released impact factors for its Open Access journals by the means of an annual editorial [1-3]. In 2012 we are-once again-pleased to report that the growth of the impact factors of MDPI's Open Access journals continues. This year's edition of the Journal Citation Reports (JCR), which is published annually by Thomson Reuters, includes 10 journals published by MDPI, including three that have received their first official Impact Factors- International Journal of Environmental Research and Public Health (IJERPH), Materials Nutrients. Table 1 reports the latest Impact Factors for 2011. Figure 1 graphically depicts the evolution of the Impact Factors for four MDPI open access journals that have received Impact Factors in the past. Table 2 reports the ranking of the MDPI journals within the subject categories of the Science Citation Index Expanded.

  4. Fibroblast growth factors: key players in regeneration and tissue repair.

    Science.gov (United States)

    Maddaluno, Luigi; Urwyler, Corinne; Werner, Sabine

    2017-11-15

    Tissue injury initiates a complex repair process, which in some organisms can lead to the complete regeneration of a tissue. In mammals, however, the repair of most organs is imperfect and results in scar formation. Both regeneration and repair are orchestrated by a highly coordinated interplay of different growth factors and cytokines. Among the key players are the fibroblast growth factors (FGFs), which control the migration, proliferation, differentiation and survival of different cell types. In addition, FGFs influence the expression of other factors involved in the regenerative response. Here, we summarize current knowledge on the roles of endogenous FGFs in regeneration and repair in different organisms and in different tissues and organs. Gaining a better understanding of these FGF activities is important for appropriate modulation of FGF signaling after injury to prevent impaired healing and to promote organ regeneration in humans. © 2017. Published by The Company of Biologists Ltd.

  5. Key nutrients and growth factors for the neonatal gastrointestinal tract.

    Science.gov (United States)

    Burrin, Douglas G; Stoll, Barbara

    2002-03-01

    The nutritional support of gastrointestinal growth and function is an important consideration in the clinical care of neonatal infants. In most health infants, the provision of either breast milk or formula seems to support normal intestinal mucosal growth, but the most significant advantages of breast milk may be for host defense or gut barrier-related functions that are involved in reducing infection. The specific effects of various milk-borne growth factors on key mucosal immune and barrier functions are likely to provide valuable new clues to the advantages of human milk. A substantial number of preterm, low-birth weight babies or those suffering from compromised intestinal function, however, often cannot tolerate oral feedings and instead receive TPN. The consequences of TPN on gastrointestinal function and how this contributes to morbidity of these infants warrants further study, with respect to both clinical and basic research questions. Although enteral nutrition seems to be a critical stimulus for intestinal function, the minimal amounts and composition of nutrients necessary to maintain specific intestinal functions remain to be established. The experimental tools exist to start defining the specific nutrient requirements for the infant gut and some of these nutrients are known (e.g., glutamate, glutamine, and threonine). Peptide growth factors and gut hormones clearly play a role in gut growth and in several ways mediate the trophic actions of enteral nutrition. Although a number of these growth factors are good candidates for therapeutic use, their clinical application in the management of gastrointestinal insufficiency and disease has been slow. The emergence of GLP-2 as a trophic peptide that seems to target the gut is a promising candidate on the horizon.

  6. Fibroblast growth factor receptor 4 regulates tumor invasion by coupling fibroblast growth factor signaling to extracellular matrix degradation

    DEFF Research Database (Denmark)

    Sugiyama, Nami; Varjosalo, Markku; Meller, Pipsa

    2010-01-01

    Aberrant expression and polymorphism of fibroblast growth factor receptor 4 (FGFR4) has been linked to tumor progression and anticancer drug resistance. We describe here a novel mechanism of tumor progression by matrix degradation involving epithelial-to-mesenchymal transition in response...

  7. Maternal serum placental growth hormone, but not human placental lactogen or insulin growth factor-1, is positively associated with fetal growth in the first half of pregnancy

    DEFF Research Database (Denmark)

    Pedersen, N G; Juul, A; Christiansen, M

    2010-01-01

    To investigate if maternal levels of human placental lactogen (hPL), placental growth hormone (PGH) and insulin-like growth factor-1 (IGF-1) are associated with growth rate of the biparietal diameter (BPD) in the first half of pregnancy.......To investigate if maternal levels of human placental lactogen (hPL), placental growth hormone (PGH) and insulin-like growth factor-1 (IGF-1) are associated with growth rate of the biparietal diameter (BPD) in the first half of pregnancy....

  8. Insulin-like growth factors in embryonic and fetal growth and skeletal development (Review).

    Science.gov (United States)

    Agrogiannis, Georgios D; Sifakis, Stavros; Patsouris, Efstratios S; Konstantinidou, Anastasia E

    2014-08-01

    The insulin-like growth factors (IGF)-I and -II have a predominant role in fetal growth and development. IGFs are involved in the proliferation, differentiation and apoptosis of fetal cells in vitro and the IGF serum concentration has been shown to be closely correlated with fetal growth and length. IGF transcripts and peptides have been detected in almost every fetal tissue from as early in development as pre‑implantation to the final maturation stage. Furthermore, IGFs have been demonstrated to be involved in limb morphogenesis. However, although ablation of Igf genes in mice resulted in growth retardation and delay in skeletal maturation, no impact on outgrowth and patterning of embryonic limbs was observed. Additionally, various molecular defects in the Igf1 and Igf1r genes in humans have been associated with severe intrauterine growth retardation and impaired skeletal maturation, but not with truncated limbs or severe skeletal dysplasia. The conflicting data between in vitro and in vivo observations with regard to bone morphogenesis suggests that IGFs may not be the sole trophic factors involved in fetal skeletal growth and that redundant mechanisms may exist in chondro- and osteogenesis. Further investigation is required in order to elucidate the functions of IGFs in skeletal development.

  9. Effects of medium flow on axon growth with or without nerve growth factor.

    Science.gov (United States)

    Kumamoto, Junichi; Kitahata, Hiroyuki; Goto, Makiko; Nagayama, Masaharu; Denda, Mitsuhiro

    2015-09-11

    Axon growth is a crucial process in regeneration of damaged nerves. On the other hand, elongation of nerve fibers in the epidermis has been observed in skin of atopic dermatitis patients. Thus, regulation of nerve fiber extension might be an effective strategy to accelerate nerve regeneration and/or to reduce itching in pruritus dermatosis. We previously demonstrated that neurons and epidermal keratinocytes similarly contain multiple receptors that are activated by various environmental factors, and in particular, keratinocytes are influenced by shear stress. Thus, in the present study, we evaluated the effects of micro-flow of the medium on axon growth in the presence or absence of nerve growth factor (NGF), using cultured dorsal-root-ganglion (DRG) cells. The apparatus, AXIS™, consists of two chambers connected by a set of microgrooves, through which signaling molecules and axons, but not living cells, can pass. When DRG cells were present in chamber 1, NGF was present in chamber 2, and micro-flow was directed from chamber 1 to chamber 2, axon growth was significantly increased compared with other conditions. Acceleration of axon growth in the direction of the micro-flow was also observed in the absence of NGF. These results suggest that local micro-flow might significantly influence axon growth. Copyright © 2015 Elsevier Inc. All rights reserved.

  10. Steady Impact Factor Growth for MDPI Open Access Journals

    Directory of Open Access Journals (Sweden)

    Alexander Thiesen

    2012-09-01

    Full Text Available For the past three years MDPI has announced the newly released impact factors for its Open Access journals by the means of an annual editorial [1–3]. In 2012 we are—once again—pleased to report that the growth of the impact factors of MDPI’s Open Access journals continues. This year’s edition of the Journal Citation Reports (JCR, which is published annually by Thomson Reuters, includes 10 journals published by MDPI, including three that have received their first official Impact Factors—International Journal of Environmental Research and Public Health (IJERPH, Materials and Nutrients. Table 1 reports the latest Impact Factors for 2011. Figure 1 graphically depicts the evolution of the Impact Factors for four MDPI open access journals that have received Impact Factors in the past. Table 2 reports the ranking of the MDPI journals within the subject categories of the Science Citation Index Expanded (SCIE.

  11. Growth factor choice is critical for successful functionalization of nanoparticles

    Directory of Open Access Journals (Sweden)

    Josephine ePinkernelle

    2015-09-01

    Full Text Available Nanoparticles (NPs show new characteristics compared to the corresponding bulk material. These nanoscale properties make them interesting for various applications in biomedicine and life sciences. One field of application is the use of magnetic NPs to support regeneration in the nervous system. Drug delivery requires a functionalization of NPs with bio-functional molecules. In our study, we functionalized self-made PEI-coated iron oxide NPs with nerve growth factor (NGF and glial cell-line derived neurotrophic factor (GDNF. Next, we tested the bio-functionality of NGF in a rat pheochromocytoma cell line (PC12 and the bio-functionality of GDNF in an organotypic spinal cord culture. Covalent binding of NGF to PEI-NPs impaired bio-functionality of NGF, but non-covalent approach differentiated PC12 cells reliably. Non-covalent binding of GDNF showed a satisfying bio-functionality of GDNF:PEI-NPs, but turned out to be instable in conjugation to the PEI-NPs. Taken together, our study showed the importance of assessing bio-functionality and binding stability of functionalized growth factors using proper biological models. It also shows that successful functionalization of magnetic NPs with growth factors is dependent on the used binding chemistry and that it is hardly predictable. For use as therapeutics, functionalization strategies have to be reproducible and future studies are needed.

  12. Intragraft platelet-derived growth factor-alpha and transforming growth factor-beta1 during the development of accelerated graft vascular disease after clinical heart transplantation

    NARCIS (Netherlands)

    de Groot-Kruseman, H A; Baan, C C; Mol, W M; Niesters, H G; Maat, A P; Balk, A H; Weimar, W

    1999-01-01

    This study was to determine whether the growth factors platelet-derived growth factor-alpha (PDGF-alpha) and transforming growth factor-beta1 (TGF-beta1) contribute to the development of graft vascular disease (GVD) after clinical heart transplantation. We analysed intragraft PDGF-alpha and

  13. Inhibition of platelet-derived growth factor signaling prevents muscle fiber growth during skeletal muscle hypertrophy.

    Science.gov (United States)

    Sugg, Kristoffer B; Korn, Michael A; Sarver, Dylan C; Markworth, James F; Mendias, Christopher L

    2017-03-01

    The platelet-derived growth factor receptors alpha and beta (PDGFRα and PDGFRβ) mark fibroadipogenic progenitor cells/fibroblasts and pericytes in skeletal muscle, respectively. While the role that these cells play in muscle growth and development has been evaluated, it was not known whether the PDGF receptors activate signaling pathways that control transcriptional and functional changes during skeletal muscle hypertrophy. To evaluate this, we inhibited PDGFR signaling in mice subjected to a synergist ablation muscle growth procedure, and performed analyses 3 and 10 days after induction of hypertrophy. The results from this study indicate that PDGF signaling is required for fiber hypertrophy, extracellular matrix production, and angiogenesis that occur during muscle growth. © 2017 Federation of European Biochemical Societies.

  14. Postnatal Tendon Growth and Remodeling Requires Platelet-Derived Growth Factor Receptor Signaling.

    Science.gov (United States)

    Sugg, Kristoffer B; Markworth, James F; Disser, Nathaniel P; Rizzi, Andrew M; Talarek, Jeffrey R; Sarver, Dylan C; Brooks, Susan V; Mendias, Christopher L

    2017-12-13

    Platelet-derived growth factor receptor (PDGFR) signaling plays an important role in the fundamental biological activities of many cells that compose musculoskeletal tissues. However, little is known about the role of PDGFR signaling during tendon growth and remodeling in adult animals. Using the hindlimb synergist ablation model of tendon growth, our objectives were to determine the role of PDGFR signaling in the adaptation of tendons subjected to a mechanical growth stimulus, as well as to investigate the biological mechanisms behind this response. We demonstrate that both PDGFRs, PDGFRα and PDGFRβ, are expressed in tendon fibroblasts, and that the inhibition of PDGFR signaling suppresses the normal growth of tendon tissue in response to mechanical growth cues due to defects in fibroblast proliferation and migration. We also identify that membrane type-1 matrix metalloproteinase (MT1-MMP) as an essential proteinase for the migration of tendon fibroblasts through their extracellular matrix. Furthermore, we report that MT1-MMP translation is regulated by PI3K/Akt signaling , while ERK1/2 controls post-translational trafficking of MT1-MMP to the plasma membrane of tendon fibroblasts. Taken together, these findings demonstrate that PDGFR signaling is necessary for postnatal tendon growth and remodeling, and that MT1-MMP is a critical mediator of tendon fibroblast migration and a potential target for the treatment of tendon injuries and diseases.

  15. Fatores determinantes do crescimento infantil Determinant factors of infant growth

    Directory of Open Access Journals (Sweden)

    Sylvia de Azevedo Mello Romani

    2004-03-01

    Full Text Available Esta revisão enfoca os fatores que interferem no crescimento de crianças nos primeiros anos de vida. Foram utilizadas informações de artigos publicados em revistas científicas, teses e publicações de organizações internacionais. O crescimento infantil se constitui em um dos melhores indicadores de saúde da criança e o retardo estatural representa atualmente, a característica antropométrica mais representativa do quadro epidemiológico da desnutrição no Brasil. Ressaltando a importância do fator genético no crescimento, a revisão abrange com maior ênfase a atuação dos fatores extrínsecos, sabendo-se que o processo de crescimento resulta da interação entre a carga genética e os fatores do meio ambiente, os quais premitirão a maior ou menor expressão do potencial genético. Face a comprovada natureza multicausal do crescimento infantil, vários estudos têm sido desenvolvidos, buscando relacionar variáveis biológicas, socioeconômicas, maternas, ambientais, culturais, demográficas, nutricionais, entre outras, com a sua etiologia, seu desenvolvimento e sua manutenção. A revisão apresentada reforça o interesse em investigações sobre o crescimento na primeira infância que devem ser permanentes, devido, principalmente, às repercussões a longo prazo sobre a saúde infantil.This review focuses on factors interfering with growth during the first years of life. Information was collected from articles published in indexed scientific journals, theses, technical books and publications of international organizations. Infant growth is one of the best health indicators, and linear growth retardation is currently the most representative anthropometric characteristic of child nutrition epidemiology in Brazil. The review indicates the value of genetics in growth, focusing, however on the influence of the extrinsic factors. Growth process results from interaction between genetic and environmental factors, determining variation

  16. Fetal effects of epidermal growth factor deficiency induced in rats by autoantibodies against epidermal growth factor

    DEFF Research Database (Denmark)

    Raaberg, Lasse; Nexø, Ebba; Jørgensen, P E

    1995-01-01

    and a lower birth weight. The weight of the lungs was particularly low in the offspring of EGF-immunized rats, and morphologically the lungs from the surviving pups seemed atelectatic and had alveolar duct dilatation, which indicates mild respiratory distress syndrome. Judged from immunohistochemical studies......, the amount of surfactant protein-A was decreased, suggesting a delayed lung maturation. The offspring of EGF-immunized rats had dry and wrinkled skin. The skin was thin and the hair follicles were immature. This suggests a role for EGF in the growth and development of the skin. The liver/body weight ratio...... was lower in pups from EGF-immunized rats. This difference was, however, not significant (p = 0.07), but flow cytometric analyses showed a significantly lower proportion of the liver cells from newborn EGF-deficient pups to be in S-phase and indicated that these cells were larger than liver cells from...

  17. Differential expression of growth factors in irradiated mouse testes

    International Nuclear Information System (INIS)

    Mauduit, Claire; Siah, Ahmed; Foch, Marie; Chapet, Olivier; Clippe, Sebastien; Gerard, Jean-Pierre; Benahmed, Mohamed

    2001-01-01

    Purpose: By using as an experimental model the male mouse gonad, which contains both radiosensitive (germ) and radioresistant (somatic) cells, we have studied the growth factor (and/or receptor) expression of transforming growth factor-β receptor (TGFβ RI), stem cell factor (SCF), c-kit, Fas-L, Fas, tumor necrosis factor receptor (TNF R55), and leukemia inhibiting factor receptor (LIF-R) after local irradiation. Methods and Materials: Adult male mice were locally irradiated on the testes. Induction of apoptosis in the different testicular cell types following X-ray radiation was identified by the TdT-mediated dUTP Nick End Labeling (TUNEL) approach. Growth factor expression was evidenced by semiquantitative RT-PCR and Western blot analyses. Results: Apoptosis, identified through the TUNEL approach, occurred in radiosensitive testicular (premeotic) germ cells with the following kinetics: the number of apoptotic cells increased after 24 h (p<0.001) and was maximal 48 h after a 2-Gy ionizing radiation (p<0.001). Apoptotic cells were no longer observed 72 h after a 2-Gy irradiation. The number of apoptotic cells increased with the dose of irradiation (1-4 Gy). In the seminiferous tubules, the growth factor expression in premeiotic radiosensitive germ cells was modulated by irradiation. Indeed Fas, c-kit, and LIF-R expression, which occurs in (radiosensitive) germ cells, decreased 24 h after a 2-Gy irradiation, and the maximal decrease was observed with a 4-Gy irradiation. The decrease in Stra8 expression occurred earlier, at 4 h after a 2-Gy irradiation. In addition, a significant (p<0.03) decrease in Stra8 mRNA levels was observed at the lowest dose used (0.5 Gy, 48 h). Moreover, concerning a growth factor receptor, such as TGFβ RI, which is expressed both in radiosensitive and radioresistant cells, we observed a differential expression depending on the cell radiosensitivity after irradiation. Indeed, TGFβ RI expression was increased after irradiation in

  18. Growth Factor Liberation and DPSC Response Following Dentine Conditioning.

    Science.gov (United States)

    Sadaghiani, L; Gleeson, H B; Youde, S; Waddington, R J; Lynch, C D; Sloan, A J

    2016-10-01

    Liberation of the sequestrated bioactive molecules from dentine by the action of applied dental materials has been proposed as an important mechanism in inducing a dentinogenic response in teeth with viable pulps. Although adhesive restorations and dentine-bonding procedures are routinely practiced, clinical protocols to improve pulp protection and dentine regeneration are not currently driven by biological knowledge. This study investigated the effect of dentine (powder and slice) conditioning by etchants/conditioners relevant to adhesive restorative systems on growth factor solubilization and odontoblast-like cell differentiation of human dental pulp progenitor cells (DPSCs). The agents included ethylenediaminetetraacetic acid (EDTA; 10%, pH 7.2), phosphoric acid (37%, pH pH 1.5), and polyacrylic acid (25%, pH 3.9). Growth factors were detected in dentine matrix extracts drawn by EDTA, phosphoric acid, and citric acid from powdered dentine. The dentine matrix extracts were shown to be bioactive, capable of stimulating odontogenic/osteogenic differentiation as observed by gene expression and phenotypic changes in DPSCs cultured in monolayer on plastic. Polyacrylic acid failed to solubilize proteins from powdered dentine and was therefore considered ineffective in triggering a growth factor-mediated response in cells. The study went on to investigate the effect of conditioning dentine slices on growth factor liberation and DPSC behavior. Conditioning by EDTA, phosphoric acid, and citric acid exposed growth factors on dentine and triggered an upregulation in genes associated with mineralized differentiation, osteopontin, and alkaline phosphatase in DPSCs cultured on dentine. The cells demonstrated odontoblast-like appearances with elongated bodies and long extracellular processes extending on dentine surface. However, phosphoric acid-treated dentine appeared strikingly less populated with cells, suggesting a detrimental impact on cell attachment and growth when

  19. Nerve growth factor in bladder dysfunction: contributing factor, biomarker, and therapeutic target

    NARCIS (Netherlands)

    Ochodnický, Peter; Cruz, Célia D.; Yoshimura, Naoki; Michel, Martin C.

    2011-01-01

    In the last two decades, nerve growth factor (NGF), initially described as a prototypical trophic factor in the development of sensory and sympathetic innervation, has emerged as a complex regulator of neural plasticity along the micturition pathways. This review aims to summarize the current

  20. Growth factors in idiopathic pulmonary fibrosis: relative roles

    Directory of Open Access Journals (Sweden)

    Allen Jeremy T

    2001-11-01

    Full Text Available Abstract Treatment of idiopathic pulmonary fibrosis patients has evolved very slowly; the fundamental approach of corticosteroids alone or in combination with other immunosuppressive agents has had little impact on long-term survival. The continued use of corticosteroids is justified because of the lack of a more effective alternative. Current research indicates that the mechanisms driving idiopathic pulmonary fibrosis reflect abnormal, dysregulated wound healing within the lung, involving increased activity and possibly exaggerated responses by a spectrum of profibrogenic growth factors. An understanding of the roles of these growth factors, and the way in which they modulate events at cellular level, could lead to more targeted therapeutic strategies, improving patients' quality of life and survival.

  1. Soluble vascular endothelial growth factor in various blood transfusion components

    DEFF Research Database (Denmark)

    Nielsen, Hans Jørgen; Werther, K; Mynster, T

    1999-01-01

    BACKGROUND: Blood transfusion may reduce survival after curative surgery for solid tumors. This may be related to extracellular content of cancer growth factors present in transfusion components. Vascular endothelial growth factor (VEGF) is a potent stimulator of angiogenesis in solid tumors....... The potential content of VEGF in various blood components for transfusion was evaluated. STUDY DESIGN AND METHODS: Soluble VEGF (sVEGF, isotype 165) was determined by an enzyme-linked immunosorbent assay (EIA) in serum and plasma samples and in lysed cells from healthy volunteers. Subsequently, total content......-reduced PRP. The sVEGF accumulated significantly in WB, SAGM blood, and BCP pools, depending on the storage time. CONCLUSION: The sVEGF (isotype 165) appears to be present in various blood transfusion components, depending on storage time....

  2. Immunohistochemical localization of epidermal growth factor in rat and man

    DEFF Research Database (Denmark)

    Poulsen, Steen Seier; Nexø, Ebba

    1986-01-01

    Epidermal growth factor (EGF) is a peptide which stimulates cell mitotic activity and differentiation, has a cytoprotective effect on the gastroduodenal mucosa, and inhibits gastric acid secretion. The immunohistochemical localization of EGF in the Brunner's glands and the submandibular glands is...... antisera against human urinary EGF worked in rat as well as man. EGF was found only in cells with an exocrine function.......Epidermal growth factor (EGF) is a peptide which stimulates cell mitotic activity and differentiation, has a cytoprotective effect on the gastroduodenal mucosa, and inhibits gastric acid secretion. The immunohistochemical localization of EGF in the Brunner's glands and the submandibular glands...... is well documented. The localization of EGF in other tissues is still unclarified. In the present study, the immunohistochemical localization of EGF in tissues from rat, man and a 20 week human fetus were investigated. In man and rat, immunoreaction was found in the submandibular glands, the serous glands...

  3. Purification of human platelet-derived growth factor

    International Nuclear Information System (INIS)

    Raines, E.W.; Ross, R.

    1985-01-01

    The paper describes a method for purification of human platelet-derived growth factor (PDGF) from outdated platelet-rich plasma (PRP) using commonly available laboratory reagents and yielding a mitogen purified 800,000-fold over the starting material. [ 3 H]thymidine incorporation into DNA of cultured cells responsive to PDGF represents the most readily available method to follow its purification and define the biological activity of a purified preparation. Other assays to quantitate PDGF include radioreceptor assay and radioimmunoassay

  4. Chance, creativity, and the discovery of the nerve growth factor.

    Science.gov (United States)

    de Romo, Ana Cecilia Rodríguez

    2007-01-01

    This essay analyzes the history of the Nerve Growth Factor (NGF) discovery, relating some of the principles of the theory of scientific creativity to the cognitive and personal qualities of the scientists that participated in the discovery, particularly Rita Levi-Montalcini and Viktor Hamburger. The discovery of NGF is especially attractive for the history of science as it involves chance, luck, creativity, and some extraordinary scientists.

  5. Foreign Direct Investment, Host Country Factors and Economic Growth

    OpenAIRE

    Edna Maeyen Solomon

    2011-01-01

    This paper analyses how the levels of economic development, human capital, financial development and the qualities of the economic and political environments in host countries simultaneously affects the impact of aggregate inflows of Foreign Direct Investment (FDI) on economic growth. Multiple interaction terms are employed between inward FDI and each of the host country factors mentioned above. The System GMM estimator is applied to a panel of 111 countries from 1981 to 2005. The results sho...

  6. Milk minor constituents, enzymes, hormones, growth factors, and organic acids

    OpenAIRE

    Rodrigues, L. R.

    2013-01-01

    Milk and derived products contain essential nutrients, such as proteins, lactose, minerals, vitamins, and enzymes. Additionally, despite of their low concentrations in milk, many other minor constituents present important physiological and/or technological roles (e.g. hormones, growth factors). Dairy industries face many challenges regarding milk processing. Also, the full knowledge on these constituents’ physiological roles and effects on health is still lacking. Technological...

  7. Factors Affecting Post-Service Wage Growth for Veterans

    Science.gov (United States)

    1991-12-01

    block number) FIELD GROUP SUBGROUP National Longitudinal Survey of Youth (NLSY I, veterans, local unemployment 19. ABSTRACT (continue on reverse if...ings in these two years was the local unemployment rate. It was also discovered that the determinants of earnings in 1982 differed significantly...analyzes factors affecting the post-service -arnings and wage growth of veterans. The 1979-1987 National Longitudi-’nal Survey of Youth was tlbe

  8. Cytokines and growth factors cross-link heparan sulfate

    Science.gov (United States)

    Migliorini, Elisa; Thakar, Dhruv; Kühnle, Jens; Sadir, Rabia; Dyer, Douglas P.; Li, Yong; Sun, Changye; Volkman, Brian F.; Handel, Tracy M.; Coche-Guerente, Liliane; Fernig, David G.; Lortat-Jacob, Hugues; Richter, Ralf P.

    2015-01-01

    The glycosaminoglycan heparan sulfate (HS), present at the surface of most cells and ubiquitous in extracellular matrix, binds many soluble extracellular signalling molecules such as chemokines and growth factors, and regulates their transport and effector functions. It is, however, unknown whether upon binding HS these proteins can affect the long-range structure of HS. To test this idea, we interrogated a supramolecular model system, in which HS chains grafted to streptavidin-functionalized oligoethylene glycol monolayers or supported lipid bilayers mimic the HS-rich pericellular or extracellular matrix, with the biophysical techniques quartz crystal microbalance (QCM-D) and fluorescence recovery after photobleaching (FRAP). We were able to control and characterize the supramolecular presentation of HS chains—their local density, orientation, conformation and lateral mobility—and their interaction with proteins. The chemokine CXCL12α (or SDF-1α) rigidified the HS film, and this effect was due to protein-mediated cross-linking of HS chains. Complementary measurements with CXCL12α mutants and the CXCL12γ isoform provided insight into the molecular mechanism underlying cross-linking. Fibroblast growth factor 2 (FGF-2), which has three HS binding sites, was also found to cross-link HS, but FGF-9, which has just one binding site, did not. Based on these data, we propose that the ability to cross-link HS is a generic feature of many cytokines and growth factors, which depends on the architecture of their HS binding sites. The ability to change matrix organization and physico-chemical properties (e.g. permeability and rigidification) implies that the functions of cytokines and growth factors may not simply be confined to the activation of cognate cellular receptors. PMID:26269427

  9. Cultivating liver cells on printed arrays of hepatocyte growth factor.

    Science.gov (United States)

    Jones, Caroline N; Tuleuova, Nazgul; Lee, Ji Youn; Ramanculov, Erlan; Reddi, A Hari; Zern, Mark A; Revzin, Alexander

    2009-08-01

    Growth factors are commonly present in soluble form during in vitro cell cultivation experiments in order to provide signals for cellular proliferation or differentiation. In contrast to these traditional experiments, we investigated solid-phase presentation of a hepatocyte growth factor (HGF), a protein important in liver development and regeneration, on microarrays of extracellular matrix (ECM) proteins. In our experiments, HGF was mixed in solution with ECM proteins (collagen (I), (IV) or laminin) and robotically printed onto silane-modified glass slides. Primary rat hepatocytes were seeded onto HGF/ECM protein microarrays and formed cellular clusters that corresponded in size to the dimensions of individual protein spots (500 microm diameter). Analysis of liver-specific products, albumin and alpha1-antitrypsin, revealed several fold higher levels of expression of these proteins in hepatocytes cultured on HGF/ECM microarrays compared to cells cultivated on ECM proteins alone. In addition, cultivation of hepatocytes on HGF/ECM protein spots led to spontaneous reorganization of cellular clusters from a monolayer into three-dimensional spheroids. We also investigated the effects of surface-tethered HGF on hepatocytes co-cultivated with stromal cells and observed a significantly higher level of albumin in co-cultures where hepatocytes were stimulated by HGF/ECM spots compared to co-cultures created on ECM protein islands without the growth factor. In summary, our study suggests that incorporation of HGF into ECM protein microarrays has a profound and long-lasting effect on the morphology and phenotype of primary hepatocytes. In the future, the number of growth factors printed on ECM microarrays will be expanded to enable multiplexed and combinatorial screening of inducers of cellular differentiation or proliferation.

  10. Teamwork and technology: Success factors for creating growth

    International Nuclear Information System (INIS)

    1998-01-01

    The petroleum industry faces many challenges moving toward the next century. How effectively these challenges are addressed and managed will determine whether or not the exploration and production business grows and prospers in the future. This presentation relates to success factors for growth creation. Themes discussed here are succeeding in a global energy market, evolution of relationships between oil and gas companies and service companies, the power of technology, and effectively combining teamwork and technology

  11. Fibroblast Growth Factor 23 in Long-Duration Spaceflight

    Science.gov (United States)

    Bokhari, R.; Zwart, S. R.; Fields, E.; Heer, M.; Sibonga, J.; Smith, S. M.

    2015-01-01

    Many nutritional factors influence bone, from the basics of calcium and vitamin D, to factors which influence bone through acid/base balance, including protein, sodium, and more. Fibroblast growth factor 23 (FGF23) is a recently identified factor, secreted from osteocytes, which is involved in classic (albeit complex) feedback loops controlling phosphorus homeostasis through both vitamin D and parathyroid hormone (PTH) (1, 2). As osteocytes are gravity sensing cells, it is important to determine if there are changes in FGF23 during spaceflight. In extreme cases, such as chronic kidney disease, FGF23 levels are highly elevated. FGF23 imbalances, secondary to dietary influences, may contribute to skeletal demineralization and kidney stone risk during spaceflight.

  12. Growth factor deprivation induces cytosolic translocation of SIRT1

    Science.gov (United States)

    Meng, Chengbo; Xing, Da; Wu, Shengnan; Huang, Lei

    2010-02-01

    Sirtuin type 1 (SIRT1), a NAD+-dependent histone deacetylases, plays a critical role in cellular senescence, aging and longevity. In general, SIRT1 is localized in nucleus and is believed as a nuclear protein. Though overexpression of SIRT1 delays senescence, SIRT1-protein levels decline naturally in thymus and heart during aging. In the present studies, we investigated the subcellular localization of SIRT1 in response to growth factor deprivation in African green monkey SV40-transformed kidney fibroblast cells (COS-7). Using SIRT1-EGFP fluorescence reporter, we found that SIRT1 localized to nucleus in physiological conditions. We devised a model enabling cell senescence via growth factor deprivation, and we found that SIRT1 partially translocated to cytosol under the treatment, suggesting a reduced level of SIRT1's activity. We found PI3K/Akt pathway was involved in the inhibition of SIRT1's cytosolic translocation, because inhibition of these kinases significantly decreased the amount of SIRT1 maintained in nucleus. Taken together, we demonstrated that growth factor deprivation induces cytosolic translocation of SIRT1, which suggesting a possible connection between cytoplasm-localized SIRT1 and the aging process.

  13. Keratinocyte growth factor promotes melanosome transfer to keratinocytes.

    Science.gov (United States)

    Cardinali, Giorgia; Ceccarelli, Simona; Kovacs, Daniela; Aspite, Nicaela; Lotti, Lavinia Vittoria; Torrisi, Maria Rosaria; Picardo, Mauro

    2005-12-01

    Melanogenesis and melanosome transfer from the melanocytes to the neighboring keratinocytes are induced by ultraviolet radiation and modulated by autocrine and paracrine factors. Keratinocyte growth factor (KGF/fibroblast growth factor (FGF)7) is a paracrine mediator of human keratinocyte growth and differentiation. We evaluated the influence of KGF on melanosome transfer in co-cultures of keratinocytes and melanocytes. Immunofluorescence analysis using anti-tyrosinase and anti-human cytokeratin antibodies, phagocytic assays using fluorescent latex beads, and ultrastructural analysis indicated that KGF is able to induce melanosome transfer acting only on the recipient keratinocytes and as a consequence of a general role of KGF in the promotion of the phagocytic process. Inhibition of proteinase-activated receptor-2, to block the Rho-dependent phagocytic pathway, or of the Src family tyrosine kinases, to inhibit the Rac-dependent pathway, showed that KGF promotes phagocytosis through both mechanisms. Increased expression of the KGF receptor (KGFR) on the keratinocytes by transfection led to increased phagocytosis of latex beads following KGF treatment, suggesting that the KGF effect is directly mediated by KGFR expression and activation. Moreover, confocal microscopic analysis revealed that KGFR localize in phagosomes during KGF-induced phagocytosis, suggesting a direct role of the receptor in regulating both the early steps of uptake and the intracellular traffic of the phagosomes.

  14. Effectiveness of basic fibroblast growth factor for pediatric hand burns.

    Science.gov (United States)

    Hayashida, Kenji; Fujioka, Masaki; Morooka, Shin; Saijo, Hiroto; Akita, Sadanori

    2016-11-01

    Pediatric hand deep dermal and deep burns may lead to serious hand deformity with functional impairment and result in an esthetically unfavorable outcome. Since there is no guideline regarding the use of growth factors for pediatric hand burns, we sought to investigate the effectiveness of an angiogenic and regenerative growth factor, basic fibroblast growth factor (bFGF). Consecutive series of second degree or third degree palmer burns at less than 3 years of age seen from January 2010 to June 2014 were included for evaluation at 6 months post-wound healing. The bFGF treatment started from just after injury and continued up to 21 days. Each patient had their scars scored using the Vancouver Scar Scale (VSS) at 6 months after wound healing. There were 34 children with 49 acute palmar burns. The mean healing period was 13.5 ± 4.3 days (7-44 days) and 43 wounds healed within 21 days. There was no need of additional surgery in the 43 wounds, healed within 21 days. In comparison to the wounds for which healing took more than 21 days, the wounds that healed within 21 days demonstrated significantly better pigmentation, pliability, and height according to the VSS (p pediatric palmer burns. Copyright © 2016 Tissue Viability Society. Published by Elsevier Ltd. All rights reserved.

  15. Fibroblast growth factor receptor 3 effects on proliferation and telomerase activity in sheep growth plate chondrocytes

    Directory of Open Access Journals (Sweden)

    Smith Logan B

    2012-12-01

    Full Text Available Abstract Background Fibroblast growth factor receptor 3 (FGFR3 inhibits growth-plate chondrocyte proliferation and limits bone elongation. Gain-of-function FGFR3 mutations cause dwarfism, reduced telomerase activity and shorter telomeres in growth plate chondroyctes suggesting that FGFR3 reduces proliferative capacity, inhibits telomerase, and enhances senescence. Thyroid hormone (T3 plays a role in cellular maturation of growth plate chondrocytes and a known target of T3 is FGFR3. The present study addressed whether reduced FGFR3 expression enhanced telomerase activity, mRNA expression of telomerase reverse transcriptase (TERT and RNA component of telomerase (TR, and chondrocyte proliferation, and whether the stimulation of FGFR3 by T3 evoked the opposite response. Results Sheep growth-plate proliferative zone chondrocytes were cultured and transfected with siRNA to reduce FGFR3 expression; FGFR3 siRNA reduced chondrocyte FGFR3 mRNA and protein resulting in greater proliferation and increased TERT mRNA expression and telomerase activity (p 3 significantly enhanced FGFR3 mRNA and protein expression and reduced telomerase activity (p 3 at the growth plate may be partially mediated through the FGFR3 pathway. Conclusions The results suggest that FGFR3 inhibits chondrocyte proliferation by down-regulating TERT expression and reducing telomerase activity indicating an important role for telomerase in sustaining chondrocyte proliferative capacity during bone elongation.

  16. Seasonal Patterns in Growth Hormone, Insulin and Insulin-like Growth Factor-1 in Female Muskoxen

    Directory of Open Access Journals (Sweden)

    Jan Z. Adamczewski

    1997-02-01

    Full Text Available Over a year, mean serum growth hormone concentrations ranged from 0.5 to 3 ng/ml in tame muskoxen with the lowest values and fewest pulses between October and January. Serum insulin ranged from 0.25 to 0.92 ng/ml, with minima in summer. There were marked seasonal changes in serum insulin-like growth factor-1 in both tame and wild muskoxen but the late summer peak was higher and more distinct in the tame animals with levels reaching 160-250 ng/ml in September.

  17. Insulin-like growth factor-I in growth and metabolism

    DEFF Research Database (Denmark)

    Backeljauw, P; Bang, P; Dunger, D B

    2010-01-01

    Deficiency of insulin-like growth factor-I (IGF-I) results in growth failure. A variety of molecular defects have been found to underlie severe primary IGF-I deficiency (IGFD), in which serum IGF-I concentrations are substantially decreased and fail to respond to GH therapy. Identification of more...... patients with primary or secondary IGFD is likely with investigative and diagnostic progress, particularly in the assessment of children with idiopathic short stature. Diagnosis of IGFD requires accurate and reliable IGF-I assays, adequate normative data for reference, and knowledge of IGF-I physiology...

  18. Studies on Platelet-Derived Growth Factor Beta-Receptor and Hepatocyte Growth Factor Receptor c-met in Paracrine Interactions in Human Breast Cancer

    Science.gov (United States)

    1996-09-01

    specific expression, and transforming submandibular gland . Growth Factors 1994, 10:145- activity of the mouse met proto-oncogene. Cell Growth 151...Derived Growth Factor Beta-Receptor and Hepatocyte Growth Factor Receptor c-met in Paracrine Interactions in Human Breast Cancer PRINCIPAL INVESTIGATOR...Interactions in Human Breast DAMDI7-94-J-4407 Cancer 6. AUTHOR(S) Bruce E. Elliott, Ph.D. 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING

  19. Effects of basic fibroblast growth factor and insulin-like growth factor on cultured cartilage cells from skate Raja porasa

    Science.gov (United States)

    Fan, Tingjun; Jin, Lingyun; Wang, Xiaofeng

    2003-12-01

    Effects of basic fibroblast growth factor (bFGF) and insulin-like growth factor II (IGF-II) on cartilage cells from proboscis of skate, Raja porasa Günther, were investigated in this study. The cartilage cells were cultured in 20% FBS-supplemented MEM medium at 24°C. Twelve hours after culture initiation, the cartilage cells were treated with bFGF and IGF-II at different concentration combinations. It was found that 20 ng/ml of bFGF or 80 ng/ml of IGF-II was enough to have obvious stimulating effect on the growth and division of skate cartilage cells. Test of bFGF and IGF-II together, revealed that 20 ng/ml of bFGF and 80 ng/ml of IGF-II together had the best stimulating effect on the growth and division of skate cartilage cells. The cartilage cells cultured could form a monolayer at day 7.

  20. Total-factor energy productivity growth of regions in Japan

    International Nuclear Information System (INIS)

    Honma, Satoshi; Hu, Jin-Li

    2009-01-01

    This article computes the energy productivity changes of regions in Japan using total-factor frameworks based on data envelopment analysis (DEA). Since the traditional DEA-Malmquist index cannot analyze changes in single-factor productivity changes under the total-factor framework, we apply a new index proposed by Hu and Chang [2009. Total-factor energy productivity growth of regions in China. Energy Policy, submitted for publication]: a total-factor energy productivity change index (TFEPI) that integrates the concept of the total-factor energy efficiency index into the Malmquist productivity index (MPI). Moreover, we separate TFEPI into change in relative energy efficiency, or the 'catching up effect,' and shift in the technology of energy use, or the 'innovation effect.' The data from 47 prefectures during the period of 1993-2003 are used to compute the TFEPI and its components for 4 kinds of energy. The TFEPI of electric power for commercial and industrial use changes -0.6% annually, which can be separated into a total-factor energy efficiency change of 0.2% and a technical change of -0.8%. The TFEPI for coal deteriorates by 1.0%/year, which is mostly caused by a decrease in relative energy efficiency change. We define and identify 'innovators' who cause the frontier to shift. Most regions identified as frontier shifters are located outside of Japan's four major industrial areas.

  1. Serum insulin-like growth factors, insulin-like growth factor binding proteins, and breast cancer risk in postmenopausal women

    DEFF Research Database (Denmark)

    Grønbaek, Henning; Flyvbjerg, Allan; Mellemkjaer, Lene

    2004-01-01

    BACKGROUND: Studies have shown a positive association between serum insulin-like growth factor (IGF)-I and breast cancer risk in premenopausal but not postmenopausal women. IGF-II and estrogen receptor (ER) status has never been investigated. We examined the association between IGF-I, IGF-II, IGF...... cases with breast cancer and a matched control group including 397 cohort members. We estimated breast cancer risk using Cox regression analysis with adjustment for known breast cancer risk factors. RESULTS: We observed no association for IGF-I but a positive association between levels of IGFBP-3...

  2. Growth properties and growth factor responsiveness in skin fibroblasts from centenarians.

    Science.gov (United States)

    Tesco, G; Vergelli, M; Grassilli, E; Salomoni, P; Bellesia, E; Sikora, E; Radziszewska, E; Barbieri, D; Latorraca, S; Fagiolo, U; Santacaterina, S; Amaducci, L; Tiozzo, R; Franceschi, C; Sorbi, S

    1998-03-27

    Human fibroblast cultures, which have a finite replicative lifespan in vitro, are the most widely used model for the study of senescence at the cellular level. An inverse relationship between replicative capability and donor age has been reported in human fibroblast strains. We studied the growth capacity of fibroblast primary cultures derived from people whose lifespan was as closer as possible to the expected maximum human lifespan, i.e. people over one hundred. Our data suggest that outgrowth of fibroblasts from biopsies, growth kinetics at different population doubling levels, capability to respond to a classical mitogenic stimulus (such as 20% serum) and a variety of growth factors, were remarkably similar in fibroblasts from centenarians and young controls. On the whole, our data challenge the tenet of a simple and strict relationship between in vivo aging and in vitro proliferative capability of human fibroblasts, at least at the individual level.

  3. Insulin-like growth factors: assay methods and their implications

    International Nuclear Information System (INIS)

    Guyda, H.J.; Posner, B.I.; Schiffrin, A.; Rappaport, R.; Postel-Vinay, M.C.; Corvol, M.T.

    1981-01-01

    The insulin-like growth factors (IGF's) are small molecular weight peptides (6-10 x 10 3 daltons) that circulate in blood plasma almost entirely bound to macromolecular carrier proteins. The growth-promoting and insulin-like activities of IGF's can be explained by the observed ability of these peptides to interact with the IGF receptor on the one hand and with the insulin receptor on the other. These observations have led to the establishment of radioreceptor assays (RRA's), competitive protein binding assays (CPBA's), and more recently radioimmunoassays (RIA's) for the IGF's that have different specificities. Because of their ease of performance and sensitivity, the radioligand assays have largely supplanted the biological assays originally utilized to identify and characterize these anabolic peptides. In this report the authors' studies are summarised which utilize a slightly acidic IGF which has been purified on the basis of its insulin-like activity in an insulin RRA and which was termed ILAs. They refer to purified insulin-like peptides that have the properties of a somatomedin by the generic term insulin-like growth factor (IGF). Somatomedin (SM) activity will be utilized to connote that activity in plasma or serum determined by bioassay. The competitive dose-response curves for IGF peptides in the insulin RRA as well as those in the ILAs RRA are presented. A combination of bioassays, RRA and RIA were employed to assess somatomedin activity and IGF peptide levels in a number of clinical circumstances. The correlations are discussed. (Auth.)

  4. Bias factors for radiation creep, growth and swelling

    International Nuclear Information System (INIS)

    Nichols, F.A.

    1980-01-01

    Central to the present concepts of the origin of the radiation-induced creep, growth and swelling phenomena is the relative interaction of interstitials and vacancies with various sinks. Radiation-induced climb of dislocations, which figures in many theories of radiation creep and growth, requires the absorption of an excess of either vacancies or interstitials. On the other hand, radiation swelling requires the absorption of an excess of vacancies to effect void growth. These relative preferences are normally expressed in theoretical models by certain bias factors, or capture efficiencies, usually assumed to be constant. Several attempts have been made to estimate their magnitude theoretically but all are seen to involve errors or physically unrealistic assumptions. We present here a unified treatment in which these various bias factors are estimated in a self-consistent model which incorporates, for the first time, all the essential physics, i.e., defect production, interactions of both vacancies and interstitials with sinks and the presence of two types of sinks. We present quantitative evaluations for the SIPA creep model and for radiation swelling, and compare with previous estimates of these phenomena. (orig.)

  5. Bias factors for radiation creep, growth and swelling

    International Nuclear Information System (INIS)

    Nichols, F.A.

    1979-01-01

    Central to the present concepts of the origin of the radiation-induced creep, growth and swelling phenomena is the relative interaction of interstitials and vacancies with various sinks. Radiation-induced climb of dislocations, which figures in many theories of radiation creep and growth, requires the absorption of an excess of either vacancies or interstitials. On the other hand, radiation swelling requires the absorption of an excess of vacancies to affect void growth. These relative preferences are normally expressed in theoretical models by certain bias factors, or capture efficiencies, usually assumed to be constant. Several attempts have been made to estimate their magnitude theoretically but all are seen to involve errors or physically unrealistic assumptions. We present here a unified treatment in which these various bias factors are estimated in a self-consistent model which incorporates, for the first time, all the essential physics, i.e., defect production, interactions of both vacancies and interstitials with sinks and the presence of two types of sinks. We present quantitative evaluations for the SIPA creep model and for radiation swelling, and compare with previous estimates of these phenomena

  6. Fibroblast growth factor (FGF) signaling in development and skeletal diseases.

    Science.gov (United States)

    Teven, Chad M; Farina, Evan M; Rivas, Jane; Reid, Russell R

    2014-12-01

    Fibroblast growth factors (FGF) and their receptors serve many functions in both the developing and adult organism. Humans contain 18 FGF ligands and four FGF receptors (FGFR). FGF ligands are polypeptide growth factors that regulate several developmental processes including cellular proliferation, differentiation, and migration, morphogenesis, and patterning. FGF-FGFR signaling is also critical to the developing axial and craniofacial skeleton. In particular, the signaling cascade has been implicated in intramembranous ossification of cranial bones as well as cranial suture homeostasis. In the adult, FGFs and FGFRs are crucial for tissue repair. FGF signaling generally follows one of three transduction pathways: RAS/MAP kinase, PI3/AKT, or PLCγ. Each pathway likely regulates specific cellular behaviors. Inappropriate expression of FGF and improper activation of FGFRs are associated with various pathologic conditions, unregulated cell growth, and tumorigenesis. Additionally, aberrant signaling has been implicated in many skeletal abnormalities including achondroplasia and craniosynostosis. The biology and mechanisms of the FGF family have been the subject of significant research over the past 30 years. Recently, work has focused on the therapeutic targeting and potential of FGF ligands and their associated receptors. The majority of FGF-related therapy is aimed at age-related disorders. Increased understanding of FGF signaling and biology may reveal additional therapeutic roles, both in utero and postnatally. This review discusses the role of FGF signaling in general physiologic and pathologic embryogenesis and further explores it within the context of skeletal development.

  7. BSC-1 growth inhibitor/type beta transforming growth factor is a strong inhibitor of thymocyte proliferation.

    OpenAIRE

    Ristow, H J

    1986-01-01

    Growth inhibitor/type beta transforming growth factor purified from BSC-1 cells and human platelets is shown to strongly inhibit the proliferation of Con A-stimulated mouse thymocytes. The inhibition can be achieved with growth inhibitor/type beta transforming growth factor concentrations approximately equal to 1/10th those necessary to inhibit keratinocyte cultures. The inhibitory effect in thymocyte cultures can be reversed by the addition of interleukin 2. These findings suggest that growt...

  8. Systemic treatment with epidermal growth factor but not insulin-like growth factor I decreases the involution of the prostate in castrated rats

    DEFF Research Database (Denmark)

    Tørring, N; Vinter-Jensen, L; Sørensen, Flemming Brandt

    2000-01-01

    Epidermal growth factor (EGF) and insulin-like growth factor I (IGF-I) are strong inducers of proliferation to prostate cells cultured in serum-free medium. Accordingly we wanted to study the growth of the prostate gland in castrated rats after treatment with EGF, IGF-I and testosterone. Castrated...

  9. Inhibition of placenta growth factor with TB-403

    DEFF Research Database (Denmark)

    Nielsen, Dorte Lisbet; Sengeløv, Lisa

    2012-01-01

    targeting angiogenesis. AREAS COVERED: The data are obtained by searching in the PubMed database. The search terms used included antiangiogenic therapy, TB-403 (RO5323441), placenta growth factor (PlGF) and VEGFR-1 (Flt-1). We review preclinical data concerning the function and inhibition of PlGF...... and summarize data on expression of PlGF in cancer patients. Data from early-phase clinical trials of TB-403 (RO5323441), a monoclonal antibody inhibiting PlGF, are discussed. Future development strategies, therapeutic potentials and limitations of TB-403 are further evaluated. EXPERT OPINION: There are some...... conflicting data on the function of PlGF and the importance of its role in primary tumor growth. Data from some preclinical models of PlGF inhibition and early-phase clinical trials with TB-403 are, however, promising, although the true potential of the drug is yet to be determined. Further clinical...

  10. Energy consumption and total factor productivity growth in Iranian agriculture

    Directory of Open Access Journals (Sweden)

    Reza Moghaddasi

    2016-11-01

    Full Text Available In this study we investigated the relation between energy consumption and growth of total factor productivity (TFP of agriculture in Iran from 1974 to 2012 using Solow residual method. The results from estimated aggregate Cobb–Douglas production function showed that one percent change in the value of labor, capital and energy will lead to 4.07, 0.09 and 0.49 percent change in agriculture value added, respectively. Also in a long term, based on the Johansen cointegration test, there is a negative relation between TFP growth and energy consumption in Iranian agriculture which might be due to cheap and inefficient energy use in this sector. Gradual liberalization of energy price and use of so called green box support policies is recommended.

  11. Nerve growth factor released from a novel PLGA nerve conduit can improve axon growth

    Science.gov (United States)

    Lin, Keng-Min; Shea, Jill; Gale, Bruce K.; Sant, Himanshu; Larrabee, Patti; Agarwal, Jay

    2016-04-01

    Nerve injury can occur due to penetrating wounds, compression, traumatic stretch, and cold exposure. Despite prompt repair, outcomes are dismal. In an attempt to help resolve this challenge, in this work, a poly-lactic-co-glycolic acid (PLGA) nerve conduit with associated biodegradable drug reservoir was designed, fabricated, and tested. Unlike current nerve conduits, this device is capable of fitting various clinical scenarios by delivering different drugs without reengineering the whole system. To demonstrate the potential of this device for nerve repair, a series of experiments were performed using nerve growth factor (NGF). First, an NGF dosage curve was developed to determine the minimum NGF concentration for optimal axonal outgrowth on chick dorsal root ganglia (DRG) cells. Next, PLGA devices loaded with NGF were evaluated for sustained drug release and axon growth enhancement with the released drug. A 20 d in vitro release test was conducted and the nerve conduit showed the ability to meet and maintain the minimum NGF requirement determined previously. Bioactivity assays of the released NGF showed that drug released from the device between the 15th and 20th day could still promote axon growth (76.6-95.7 μm) in chick DRG cells, which is in the range of maximum growth. These novel drug delivery conduits show the ability to deliver NGF at a dosage that efficiently promotes ex vivo axon growth and have the potential for in vivo application to help bridge peripheral nerve gaps.

  12. Inhibition of fibroblasts reduced head and neck cancer growth by targeting fibroblast growth factor receptor.

    Science.gov (United States)

    Sweeny, Larissa; Liu, Zhiyong; Lancaster, William; Hart, Justin; Hartman, Yolanda E; Rosenthal, Eben L

    2012-07-01

    Head and neck squamous cell carcinoma (HNSCC) is a complex disease process involving interactions with carcinoma-associated fibroblasts and endothelial cells. We further investigated these relationships by suppressing stromal cell growth through the inhibition of fibroblast growth factor receptor (FGFR). Preclinical investigation. HNSCC cell lines (FADU, OSC19, Cal27, SCC1, SCC5, SCC22A), fibroblast (HS27), and endothelial cells (human umbilical vascular endothelial cell) were cultured individually or in coculture. Proliferation was assessed following treatment with a range of physiologic concentrations of FGFR inhibitor PD173074. Mice bearing established HNSCC xenografts were treated with PD173074 (12 mg/kg), and tumor histology was analyzed for stromal composition, proliferation (Ki67 staining), and apoptosis (TUNEL [terminal deoxynucleotidyl transferase dUTP nick end labeling] staining). In vitro, inhibition of FGFR with PD173074 dramatically reduced proliferation of fibroblasts and endothelial cells compared to untreated controls. However, HNSCC cell proliferation was not affected by inhibition of FGFR. When cocultured with fibroblasts, HNSCC cells proliferation increased by 15% to 80% (P fibroblast-enhanced tumor cell growth was suppressed by FGFR inhibition. Additionally, treatment of mice bearing HNSCC xenografts with PD173074 resulted in significant growth inhibition (P < .001). Additionally, those tumors from mice treated with PD173074 had a smaller stromal component, decreased proliferation, and increased apoptosis. Targeting the FGFR pathway in head and neck cancer acts through the stromal components to decrease HNSCC growth in vivo and in vitro. Copyright © 2012 The American Laryngological, Rhinological, and Otological Society, Inc.

  13. Insulin-like growth factor binding proteins: a structural perspective

    Directory of Open Access Journals (Sweden)

    Briony eForbes

    2012-03-01

    Full Text Available Insulin-like growth factor binding proteins (IGFBP-1 to -6 bind insulin-like growth factors-I and -II (IGF-I and IGF-II with high affinity. These binding proteins maintain IGFs in the circulation and direct them to target tissues, where they promote cell growth, proliferation, differentiation and survival via the type 1 IGF receptor (IGF-1R. IGFBPs also interact with many other molecules, which not only influence their modulation of IGF action but also mediate IGF-independent activities that influence processes such as cell migration and apoptosis by influencing gene transcription.IGFBPs-1 to -6 are structurally similar proteins consisting of three distinct domains, N-terminal, Linker and C-terminal. There have been major advances in our understanding of IGFBP structure in the last decade and a half. While there is still no structure of an intact IGFBP to date, several structures of individual N- and C-domains have been solved. The structure of a complex of N-BP-4:IGF-I:C-BP-4 has also been solved, providing a detailed picture of the structural features of the IGF binding site and the mechanism of binding. Structural studies have also identified features important for interaction with extracellular matrix components and integrins. This review summarises structural studies reported so far and highlights features important for binding not only IGF but also other partners. It also highlights future directions in which structural studies will add to our knowledge of the role played by the IGFBP family in normal growth and development, as well as in disease.

  14. Mechanotransduction and Growth Factor Signalling to Engineer Cellular Microenvironments.

    Science.gov (United States)

    Cipitria, Amaia; Salmeron-Sanchez, Manuel

    2017-08-01

    Engineering cellular microenvironments involves biochemical factors, the extracellular matrix (ECM) and the interaction with neighbouring cells. This progress report provides a critical overview of key studies that incorporate growth factor (GF) signalling and mechanotransduction into the design of advanced microenvironments. Materials systems have been developed for surface-bound presentation of GFs, either covalently tethered or sequestered through physico-chemical affinity to the matrix, as an alternative to soluble GFs. Furthermore, some materials contain both GF and integrin binding regions and thereby enable synergistic signalling between the two. Mechanotransduction refers to the ability of the cells to sense physical properties of the ECM and to transduce them into biochemical signals. Various aspects of the physics of the ECM, i.e. stiffness, geometry and ligand spacing, as well as time-dependent properties, such as matrix stiffening, degradability, viscoelasticity, surface mobility as well as spatial patterns and gradients of physical cues are discussed. To conclude, various examples illustrate the potential for cooperative signalling of growth factors and the physical properties of the microenvironment for potential applications in regenerative medicine, cancer research and drug testing. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  15. Tissue Engineering Using Transfected Growth-Factor Genes

    Science.gov (United States)

    Madry, Henning; Langer, Robert S.; Freed, Lisa E.; Trippel, Stephen; Vunjak-Novakovic, Gordana

    2005-01-01

    A method of growing bioengineered tissues includes, as a major component, the use of mammalian cells that have been transfected with genes for secretion of regulator and growth-factor substances. In a typical application, one either seeds the cells onto an artificial matrix made of a synthetic or natural biocompatible material, or else one cultures the cells until they secrete a desired amount of an extracellular matrix. If such a bioengineered tissue construct is to be used for surgical replacement of injured tissue, then the cells should preferably be the patient s own cells or, if not, at least cells matched to the patient s cells according to a human-leucocyteantigen (HLA) test. The bioengineered tissue construct is typically implanted in the patient's injured natural tissue, wherein the growth-factor genes enhance metabolic functions that promote the in vitro development of functional tissue constructs and their integration with native tissues. If the matrix is biodegradable, then one of the results of metabolism could be absorption of the matrix and replacement of the matrix with tissue formed at least partly by the transfected cells. The method was developed for articular chondrocytes but can (at least in principle) be extended to a variety of cell types and biocompatible matrix materials, including ones that have been exploited in prior tissue-engineering methods. Examples of cell types include chondrocytes, hepatocytes, islet cells, nerve cells, muscle cells, other organ cells, bone- and cartilage-forming cells, epithelial and endothelial cells, connective- tissue stem cells, mesodermal stem cells, and cells of the liver and the pancreas. Cells can be obtained from cell-line cultures, biopsies, and tissue banks. Genes, molecules, or nucleic acids that secrete factors that influence the growth of cells, the production of extracellular matrix material, and other cell functions can be inserted in cells by any of a variety of standard transfection techniques.

  16. Association of Polymorphisms in Connective Tissue Growth Factor and Epidermal Growth Factor Receptor Genes With Human Longevity.

    Science.gov (United States)

    Donlon, Timothy A; Morris, Brian J; He, Qimei; Chen, Randi; Masaki, Kamal H; Allsopp, Richard C; Willcox, D Craig; Tranah, Gregory J; Parimi, Neeta; Evans, Daniel S; Flachsbart, Friederike; Nebel, Almut; Kim, Duk-Hwan; Park, Joobae; Willcox, Bradley J

    2017-08-01

    Growth pathways play key roles in longevity. The present study tested single-nucleotide polymorphisms (SNPs) in the connective tissue growth factor gene (CTGF) and the epidermal growth factor receptor gene (EGFR) for association with longevity. Comparison of allele and genotype frequencies of 12 CTGF SNPs and 41 EGFR SNPs between 440 American men of Japanese ancestry aged ≥95 years and 374 men of average life span revealed association with longevity at the p cases, consistent with heterozygote advantage in living to extreme old age. No associations of the most significant SNPs were observed in whites or Koreans. In conclusion, the present findings indicate that genetic variation in CTGF and EGFR may contribute to the attainment of extreme old age in Japanese. More research is needed to confirm that genetic variation in CTGF and EGFR contributes to the attainment of extreme old age across human populations. © The Author 2016. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  17. Cardiac Regeneration using Growth Factors: Advances and Challenges.

    Science.gov (United States)

    Rebouças, Juliana de Souza; Santos-Magalhães, Nereide Stela; Formiga, Fabio Rocha

    2016-09-01

    Myocardial infarction is the most significant manifestation of ischemic heart disease and is associated with high morbidity and mortality. Novel strategies targeting at regenerating the injured myocardium have been investigated, including gene therapy, cell therapy, and the use of growth factors. Growth factor therapy has aroused interest in cardiovascular medicine because of the regeneration mechanisms induced by these biomolecules, including angiogenesis, extracellular matrix remodeling, cardiomyocyte proliferation, stem-cell recruitment, and others. Together, these mechanisms promote myocardial repair and improvement of the cardiac function. This review aims to address the strategic role of growth factor therapy in cardiac regeneration, considering its innovative and multifactorial character in myocardial repair after ischemic injury. Different issues will be discussed, with emphasis on the regeneration mechanisms as a potential therapeutic resource mediated by growth factors, and the challenges to make these proteins therapeutically viable in the field of cardiology and regenerative medicine. Resumo O infarto do miocárdio representa a manifestação mais significativa da cardiopatia isquêmica e está associado a elevada morbimortalidade. Novas estratégias vêm sendo investigadas com o intuito de regenerar o miocárdio lesionado, incluindo a terapia gênica, a terapia celular e a utilização de fatores de crescimento. A terapia com fatores de crescimento despertou interesse em medicina cardiovascular, devido aos mecanismos de regeneração induzidos por essas biomoléculas, incluindo angiogênese, remodelamento da matriz extracelular, proliferação de cardiomiócitos e recrutamento de células-tronco, dentre outros. Em conjunto, tais mecanismos promovem a reparação do miocárdio e a melhora da função cardíaca. Esta revisão pretende abordar o papel estratégico da terapia, com fatores de crescimento, para a regeneração cardíaca, considerando seu car

  18. Hematopoietic growth factors for the treatment of myelodysplastic syndromes

    DEFF Research Database (Denmark)

    Hansen, P B; Penkowa, M; Johnsen, H E

    1998-01-01

    with milder forms of MDS combined with low prestudy endogenous S-Epo levels. The possible synergistic effect of combining rhEpo with rhG-CSF or rhGM-CSF has been studied with erythropoietic response rates of about 40%. The safety of the cytokine administration seems acceptable with no significant stimulation...... of leukemic myelopoiesis and subsequent progression into overt acute myeloid leukemia. In conclusion, combinations of hematopoietic growth factors may be of clinical benefit in some patients with MDS. However, due to the cost and unpredictable clinical outcome there is a need for extended laboratory research...

  19. Renal origin of rat urinary epidermal growth factor

    DEFF Research Database (Denmark)

    Nexø, Ebba; Poulsen, Steen Seier

    1984-01-01

    Brunner's glands, organs known to produce EGF, had no influence on the output of EGF in urine. Renal clearance of EGF exceeded that of creatinine, and after bilateral nephrectomy or bilateral ligation of the ureters, the concentration of creatinine in serum increased, while the concentration of EGF......The origin of rat urinary epidermal growth factor (EGF) has been investigated. Unilateral nephrectomy decreased the concentration, total output of EGF and EGF/creatinine ratio by approximately 50%, while the output of creatinine was unchanged. Removal of the submandibular glands and duodenal...

  20. Astrocyte Mitogen Inhibitor Related to Epidermal Growth Factor Receptor

    Science.gov (United States)

    Nieto-Sampedro, Manuel

    1988-06-01

    Epidermal growth factor (EGF) is a well-characterized polypeptide hormone with diverse biological activities, including stimulation of astrocyte division. A soluble astrocyte mitogen inhibitor, immunologically related to the EGF receptor, is present in rat brain. Injury to the brain causes a time-dependent reduction in the levels of this inhibitor and the concomitant appearance of EGF receptor on the astrocyte surface. Intracerebral injection of antibody capable of binding the inhibitor caused the appearance of numerous reactive astrocytes. EGF receptor-related inhibitors may play a key role in the control of glial cell division in both normal and injured brain.

  1. Vascular Permeability Factor/Vascular Endothelial Growth Factor Induces Lymphangiogenesis as well as Angiogenesis

    OpenAIRE

    Nagy, Janice A.; Vasile, Eliza; Feng, Dian; Sundberg, Christian; Brown, Lawrence F.; Detmar, Michael J.; Lawitts, Joel A.; Benjamin, Laura; Tan, Xiaolian; Manseau, Eleanor J.; Dvorak, Ann M.; Dvorak, Harold F.

    2002-01-01

    Vascular permeability factor/vascular endothelial growth factor (VPF/VEGF, VEGF-A) is a multifunctional cytokine with important roles in pathological angiogenesis. Using an adenoviral vector engineered to express murine VEGF-A164, we previously investigated the steps and mechanisms by which this cytokine induced the formation of new blood vessels in adult immunodeficient mice and demonstrated that the newly formed blood vessels closely resembled those found in VEGF-A–expressing tumors. We now...

  2. Fibroblast growth factor 21, fibroblast growth factor receptor 1, and β-Klotho expression in bovine growth hormone transgenic and growth hormone receptor knockout mice.

    Science.gov (United States)

    Brooks, Nicole E; Hjortebjerg, Rikke; Henry, Brooke E; List, Edward O; Kopchick, John J; Berryman, Darlene E

    Although growth hormone (GH) and fibroblast growth factor 21 (FGF21) have a reported relationship, FGF21 and its receptor, fibroblast growth factor receptor 1 (FGFR1) and cofactor β-Klotho (KLB), have not been analyzed in chronic states of altered GH action. The objective of this study was to quantify circulating FGF21 and tissue specific expression of Fgf21, Fgfr1, and Klb in mice with modified GH action. Based on previous studies, we hypothesized that bovine GH transgenic (bGH) mice will be FGF21 resistant and GH receptor knockout (GHR-/-) mice will have normal FGF21 action. Seven-month-old male bGH mice (n=9) and wild type (WT) controls (n=10), and GHR-/- mice (n=8) and WT controls (n=8) were used for all measurements. Body composition was determined before dissection, and tissue weights were measured at the time of dissection. Serum FGF21 levels were evaluated by ELISA. Expression of Fgf21, Fgfr1, and Klb mRNA in white adipose tissue (AT), brown AT, and liver were evaluated by reverse transcription quantitative PCR. As expected, bGH mice had increased body weight (p=3.70E -8 ) but decreased percent fat mass (p=4.87E -4 ). Likewise, GHR-/- mice had decreased body weight (p=1.78E -10 ) but increased percent fat mass (p=1.52E -9 ), due to increased size of the subcutaneous AT depot when normalized to body weight (p=1.60E -10 ). Serum FGF21 levels were significantly elevated in bGH mice (p=0.041) and unchanged in GHR-/- mice (p=0.88). Expression of Fgf21, Fgfr1, and Klb mRNA in white AT and liver were downregulated or unchanged in both bGH and GHR-/- mice. The only exception was Fgf21 expression in brown AT of GHR-/-, which trended toward increased expression (p=0.075). In accordance with our hypothesis, we provide evidence that circulating FGF21 is increased in bGH animals, but remains unchanged in GHR-/- mice. Downregulation or no change in Fgf21, Fgfr1, and Klb expression are seen in white AT, brown AT, and liver of bGH and GHR-/- mice when compared to their

  3. Genetic and environmental factors influencing the Placental Growth Factor (PGF) variation in two populations

    DEFF Research Database (Denmark)

    Sorice, Rossella; Ruggiero, Daniela; Nutile, Teresa

    2012-01-01

    Placental Growth Factor (PGF) is a key molecule in angiogenesis. Several studies have revealed an important role of PGF primarily in pathological conditions (e.g.: ischaemia, tumour formation, cardiovascular diseases and inflammatory processes) suggesting its use as a potential therapeutic agent....

  4. The role of vascular endothelial growth factor in inflammatory processes

    Directory of Open Access Journals (Sweden)

    Ewa Koczy-Baron

    2014-01-01

    Full Text Available The vascular endothelial growth factor (VEGF is produced by different types of cells and has a major role in both, physiological and pathological angiogenesis. On the one hand VEGF is a strong mitotic and chemotactic factor for the endothelial cells, stimulating thus formation of new vessels, while on the other, it enhances the vascular endothelium permeability of the existing blood vessels which contributes to development and persistence of the inflammatory conditions. In the latter its activity is by 50 000 times higher than that of histamine. VEGF facilitates formation of oedema and leukocyte migration from the circulation to the site of inflammation. VEGF is also important in remodeling of the extracellular matrix. Moreover, it has an important significance in regulation of the immunological response, therefore plays a role in autoaggressive phenomena as well as immediate- and delayed-type hypersensitivity. Its role in the pathogenesis of immunological and inflammatory diseases, including allergy, asthma and different skin disorders has been indicated.

  5. Effects of hepatocyte growth factor on glutathione synthesis, growth, and apoptosis is cell density-dependent

    International Nuclear Information System (INIS)

    Yang Heping; Magilnick, Nathaniel; Xia Meng; Lu, Shelly C.

    2008-01-01

    Hepatocyte growth factor (HGF) is a potent hepatocyte mitogen that exerts opposing effects depending on cell density. Glutathione (GSH) is the main non-protein thiol in mammalian cells that modulates growth and apoptosis. We previously showed that GSH level is inversely related to cell density of hepatocytes and is positively related to growth. Our current work examined whether HGF can modulate GSH synthesis in a cell density-dependent manner and how GSH in turn influence HGF's effects. We found HGF treatment of H4IIE cells increased cell GSH levels only under subconfluent density. The increase in cell GSH under low density was due to increased transcription of GSH synthetic enzymes. This correlated with increased protein levels and nuclear binding activities of c-Jun, c-Fos, p65, p50, Nrf1 and Nrf2 to the promoter region of these genes. HGF acts as a mitogen in H4IIE cells under low cell density and protects against tumor necrosis factor α (TNFα)-induced apoptosis by limiting JNK activation. However, HGF is pro-apoptotic under high cell density and exacerbates TNFα-induced apoptosis by potentiating JNK activation. The increase in cell GSH under low cell density allows HGF to exert its full mitogenic effect but is not necessary for its anti-apoptotic effect

  6. Basic fibroblast growth factor eluting microspheres enhance distraction enterogenesis.

    Science.gov (United States)

    Rouch, Joshua D; Scott, Andrew; Jabaji, Ziyad B; Chiang, Elvin; Wu, Benjamin M; Lee, Steven L; Shekherdimian, Shant; Dunn, James C Y

    2016-06-01

    The purpose of this study was to determine if distraction enterogenesis using self-expanding polycaprolactone (PCL) springs is a potential therapy for short bowel syndrome. Sustained release basic fibroblast growth factor (bFGF) microspheres have been shown to induce angiogenesis and intestinal regeneration in tissue engineered scaffolds. We hypothesized that the provision of bFGF-loaded microspheres would increase angiogenesis and thereby enhance the process of enterogenesis. A 10-mm segment of rodent jejunum was isolated and an encapsulated PCL spring inserted. Blank or bFGF-loaded microspheres were delivered to the segment. After 4weeks, jejunal segments were assessed for lengthening, morphology, quantification of blood vessels, and ganglia. Lengthened intestinal segments receiving bFGF microspheres demonstrated significantly increased microvascular density compared to those with blank microspheres. There were also significantly more submucosal and myenteric ganglia in the segments that received bFGF microspheres. Segments achieved similar lengthening and final muscular thickness in both blank and bFGF groups, but the bFGF microsphere caused a significant increase in luminal diameter of the jejunal segment. Sustained release bFGF microspheres enhanced distraction enterogenesis through improved vascularity. The synergy of growth factors such as bFGF with distraction enterogenesis may yield improved results for the future treatment of patients with short bowel syndrome. Copyright © 2016 Elsevier Inc. All rights reserved.

  7. Upregulation of epidermal growth factor receptor 4 in oral leukoplakia

    Science.gov (United States)

    Kobayashi, Hiroshi; Kumagai, Kenichi; Gotoh, Akito; Eguchi, Takanori; Yamada, Hiroyuki; Hamada, Yoshiki; Suzuki, Satsuki; Suzuki, Ryuji

    2013-01-01

    In the present study, we investigate the expression profile of the epidermal growth factor receptor family, which comprises EGFR/ErbB1, HER2/ErbB2, HER3/ErbB3 and HER4/ErbB4 in oral leukoplakia (LP). The expression of four epidermal growth factor receptor (EGFR) family genes and their ligands were measured in LP tissues from 14 patients and compared with levels in 10 patients with oral lichen planus (OLP) and normal oral mucosa (NOM) from 14 healthy donors by real-time polymerase chain reaction (PCR) and immunohistochemistry. Synchronous mRNA coexpression of ErbB1, ErbB2, ErbB3 and ErbB4 was detected in LP lesions. Out of the receptors, only ErbB4 mRNA and protein was more highly expressed in LP compared with NOM tissues. These were strongly expressed by epithelial keratinocytes in LP lesions, as shown by immunohistochemistry. Regarding the ligands, the mRNA of Neuregulin2 and 4 were more highly expressed in OLP compared with NOM tissues. Therefore, enhanced ErbB4 on the keratinocytes and synchronous modulation of EGFR family genes may contribute to the pathogenesis and carcinogenesis of LP. PMID:23492901

  8. Rapid population growth and environmental degradation: ultimate versus proximate factors.

    Science.gov (United States)

    Shaw, R P

    1989-01-01

    This philosophical review of 2 arguments about responsibility for and solutions to environmental degradation concludes that both sides are correct: the ultimate and the proximal causes. Ultimate causes of pollution are defined as the technology responsible for a given type of pollution, such as burning fossil fuel; proximate causes are defined as situation-specific factors confounding the problem, such as population density or rate of growth. Commoner and others argue that developed countries with low or negative population growth rates are responsible for 80% of world pollution, primarily in polluting technologies such as automobiles, power generation, plastics, pesticides, toxic wastes, garbage, warfaring, and nuclear weapons wastes. Distortionary policies also contribute; examples are agricultural trade protection, land mismanagement, urban bias in expenditures, and institutional rigidity., Poor nations are responsible for very little pollution because poverty allows little waste or expenditures for polluting, synthetic technologies. The proximal causes of pollution include numbers and rate of growth of populations responsible for the pollution. Since change in the ultimate cause of pollution remains out of reach, altering the numbers of polluters can make a difference. Predictions are made for proportions of the world's total waste production, assuming current 1.6 tons/capita for developed countries and 0.17 tons/capita for developing countries. If developing countries grow at current rates and become more wealthy, they will be emitting half the world's waste by 2025. ON the other hand, unsustainable population growth goes along with inadequate investment in human capital: education, health, employment, infrastructure. The solution is to improve farming technologies in the 117 non-self-sufficient countries, fund development in the most unsustainable enclaves of growing countries, break institutionalized socio-political rigidity in these enclaves, and focus on

  9. Biology of insulin-like growth factors in development.

    Science.gov (United States)

    Dupont, Joëlle; Holzenberger, Martin

    2003-11-01

    Insulin-like growth factors (IGFs) provide essential signals for the control of embryonic and postnatal development in vertebrate species. In mammals, IGFs act through and are regulated by a system of receptors, binding proteins, and related proteases. In each of the many tissues dependent on this family of growth factors, this system generates a complex interaction specific to the tissue concerned. Studies carried out over the last decade, mostly with transgenic and gene knockout mouse models, have demonstrated considerable variety in the cell type-specific and developmental stage-specific functions of IGF signals. Brain, muscle, bone, cartilage, pancreas, ovary, skin, and fat tissue have been identified as major in vivo targets for IGFs. Concentrating on several of these organ systems, we review here phenotypic analyses of mice with genetically modified IGF systems. Much progress has also been made in understanding the specific intracellular signaling cascades initiated by the binding of circulating IGFs to their cognate receptor. We also summarize the most relevant aspects of this research. Considerable efforts are currently focused on deciphering the functional specificities of intracellular pathways, particularly the molecular mechanisms by which cells distinguish growth-stimulating insulin-like signals from metabolic insulin signals. Finally, there is a growing body of evidence implicating IGF signaling in lifespan control, and it has recently been shown that this function has been conserved throughout evolution. Very rapid progress in this domain seems to indicate that longevity may be subject to IGF-dependent neuroendocrine regulation and that certain periods of the life cycle may be particularly important in the determination of individual lifespan. Copyright 2003 Wiley-Liss, Inc.

  10. Hepatocyte growth factor, a biomarker of macroangiopathy in diabetes mellitus.

    Science.gov (United States)

    Konya, Hiroyuki; Miuchi, Masayuki; Satani, Kahori; Matsutani, Satoshi; Tsunoda, Taku; Yano, Yuzo; Katsuno, Tomoyuki; Hamaguchi, Tomoya; Miyagawa, Jun-Ichiro; Namba, Mitsuyoshi

    2014-10-15

    Atherosclerotic involvements are an essential causal element of prospect in diabetes mellitus (DM), with carotid atherosclerosis (CA) being a common risk-factor for prospective crisis of coronary artery diseases (CAD) and/or cerebral infarction (CI) in DM subjects. From another point of view, several reports have supplied augmenting proof that hepatocyte growth factor (HGF) has a physiopathological part in DM involvements. HGF has been a mesenchymal-derived polyphenic factor which modulates development, motion, and morphosis of diverse cells, and has been regarded as a humor intermediator of epithelial-mesenchymal interplays. The serum concentrations of HGF have been elevated in subjects with CAD and CI, especially during the acute phase of both disturbances. In our study with 89 type 2 DM patients, the association between serum concentrations of HGF and risk-factors for macrovascular complications inclusive of CA were examined. The average of serum HGF levels in the subjects was more elevated than the reference interval. The serum HGF concentrations associated positively with both intimal-media thickness (IMT) (r = 0.24, P = 0.0248) and plaque score (r = 0.27, P = 0.0126), indicating a relationship between the elevated HGF concentrations and advancement of CA involvements. Multivariate statistical analysis accentuated that serum concentrations of HGF would be associated independently with IMT (standardized = 0.28, P = 0.0499). The review indicates what is presently known regarding serum HGF might be a new and meaningful biomarker of macroangiopathy in DM subjects.

  11. Transforming growth factor-beta1 stimulates the production of insulin-like growth factor-I and insulin-like growth factor-binding protein-3 in human bone marrow stromal osteoblast progenitors

    DEFF Research Database (Denmark)

    Kveiborg, Marie; Flyvbjerg, Allan; Eriksen, E F

    2001-01-01

    While transforming growth factor-beta1 (TGF-beta1) regulates proliferation and differentiation of human osteoblast precursor cells, the mechanisms underlying these effects are not known. Several hormones and locally acting growth factors regulate osteoblast functions through changes in the insuli...

  12. Decreased expression of serum and microvascular vascular endothelial growth factor receptor-2 in meningococcal sepsis*.

    NARCIS (Netherlands)

    Flier, M. van der; Baerveldt, E.M.; Miedema, A.; Hartwig, N.G.; Hazelzet, J.A.; Emonts, M.; Groot, R. de; Prens, E.P.; Vught, A.J. van; Jansen, N.J.

    2013-01-01

    OBJECTIVES: To determine the skin microvessel expression of vascular endothelial growth factor receptor 2 and serum-soluble vascular endothelial growth factor receptor 2 levels in children with meningococcal sepsis. DESIGN: Observational study. SETTING: Two tertiary academic children hospital PICUs.

  13. Neural cell adhesion molecule differentially interacts with isoforms of the fibroblast growth factor receptor

    DEFF Research Database (Denmark)

    Christensen, Claus; Berezin, Vladimir; Bock, Elisabeth

    2011-01-01

    The fibroblast growth factor receptor (FGFR) can be activated through direct interactions with various fibroblast growth factors or through a number of cell adhesion molecules, including the neural cell adhesion molecule (NCAM). We produced recombinant proteins comprising the ligand...

  14. Nerve growth factor mRNA in brain: localization by in situ hybridization

    International Nuclear Information System (INIS)

    Rennert, P.D.; Heinrich, G.

    1986-01-01

    Nerve Growth Factor is a 118 amino acid polypeptide that plays an important role in the differentiation and survival of neurons. The recent discovery that a mRNA that encodes beta Nerve Growth Factor is present in brain suggests that the Nerve Growth Factor gene may not only regulate gene expression of peripheral but also of central neurons. To identify the site(s) of Nerve Growth Factor mRNA production in the brain and to determine which cells express the Nerve Growth Factor gene, the technique of in situ hybridization was employed. A 32P-labeled RNA probe complementary to Nerve Growth Factor mRNA hybridized to cells in the stratum granulosum of the dentate gyrus and the stratum pyramidale of the hippocampus. These observations identify for the first time cellular sites of Nerve Growth Factor gene expression in the central nervous system, and suggest that Nerve Growth Factor mRNA is produced by neurons

  15. Growth hormone-insuline-like growth factor-I system in pejerrey Odontesthes bonariensis (Atheriniformes

    Directory of Open Access Journals (Sweden)

    S.E. Arranz

    2008-07-01

    Full Text Available Using biotechnology to increase the growth rates of fish is likely to reduce production costs per unit of food. Among vertebrates, fish appear to occupy a unique position, when growth patterns are considered. With few exceptions, fish species tend to grow indeterminately, implying that size is never fixed. Both hyperplasia and hypertrophy contribute to post-larval muscle growth in fish. Growth hormone (GH - Insulin-like Growth Factor I (IGF-I is the most important growth axis in fish. Our experimental model, the pejerrey, Odontesthes bonariensis (Ateriniformes is a South American inland water fish considered to be a promising species for intensive aquaculture. However, one major drawback to achieve this goal is its slow growth in captivity. In order to understand how growth is regulated in this species, our first objective was to characterized pejerrey GH- IGF-I axis. We first cloned and characterized pejerrey (pj GH, IGF-I and the growth hormone receptors (GHRs I and II. In addition to providing valuable data for evolutionary comparison of GH, investigation of GH action in teleosts is particularly important because of its potential application in aquaculture. GH can not only promote the somatic growth in fish but also lower dietary protein requirements. A prerequisite for providing sufficient amounts of GH for basic research and aquaculture application is a large-scale production of GH. For that purpose, recombinant pjGH was expressed in a bacterial system. Protocols for solubilization and proper folding were achieved. Activity of recombinant pjGH was assessed in fish by measuring the liver IGF-I response to different doses of GH. IGF-I transcript was measured in the liver after pjGHr in vivo stimulation by means of quantitative real-time PCR assays. A dose-dependent response of IGF-I mRNA was observed after pjGHr administration, and reached a 6 fold IGF-I maximum increase over control group when 2.5 µg pjGH /g-body weight were injected

  16. Growth factors, glucose and insulin kinetics after low dose growth hormone in HIV - lipodystrophy

    DEFF Research Database (Denmark)

    Haugaard, Steen B; Andersen, Ove; Flyvbjerg, Allan

    2006-01-01

    OBJECTIVES: Low-dose growth hormone (GH) administration has been suggested as a treatment for HIV-lipodystrophy. METHODS: Postglucose GH-secretion, kinetics of insulin-like growth factors (IGFs), insulin, and glucose metabolism were examined in six male HIV-infected lipodystrophic patients (two...... normal-weight patients with normal glucose-tolerance (NGT), two normal-weight with impaired glucose-tolerance (IGT), and two obese patients with diabetes (DM)) during a 16 weeks open-labelled pilot-study of low-dose GH, 0.7 mg/day. RESULTS: DM, compared to NGT and IGT, displayed an impaired rebound of GH...... during a 5h oral glucose-tolerance test. Near lower normal limits in all patients before GH-therapy, total and free IGF-I increased between 87 and 152% during the GH-therapy (Pupper normal limits in all patients with the highest incremental percentages shown in DM. A slight...

  17. Distribution and number of epidermal growth factor receptors in skin is related to epithelial cell growth

    DEFF Research Database (Denmark)

    Green, M R; Basketter, D A; Couchman, J R

    1983-01-01

    markedly with age. This decrease in receptor number is similar in trend to the known drop in basal cell [3H]thymidine labelling index which occurs over the same time period. The data suggest that the distribution of EGF receptors and EGF cell surface receptor number in skin are important in the spatial......, and keratinisation when injected into neonatal mice (S. Cohen and G.A. Elliott, 1963, J. Invest. Dermatol, 40, 1-5). We have determined the distribution of the available receptors for epidermal growth factor in rat skin using autoradiography following incubation of explants with 125I-labelled mouse EGF. EGF...... receptors are detected on the epithelial cells overlying the basement membranes of the epidermis, sebaceous gland, and regions of the hair follicle all of which have proliferative capacity. In marked contrast, tissues which have started to differentiate and lost their growth potential, carry either...

  18. Polysomnographic sleep, growth hormone insulin-like growth factor-I axis, leptin, and weight loss

    DEFF Research Database (Denmark)

    Rasmussen, Michael; Wildschiødtz, Gordon; Juul, Anders

    2008-01-01

    severely obese subjects (BMI: 41+/-1 kg/m(2), 32+/-2 years of age), cross-sectional at baseline, and longitudinal after a dramatically diet-induced weight loss (36+/-7 kg). Ten age- and gender-matched nonobese subjects served as controls. Sleep duration (360+/-17 vs. 448+/-15 min/night; P... compared with nonobese subjects After diet-induced weight loss the differences in GH, free IGF-I, and leptin were no longer present between previously obese and nonobese subjects, whereas a significant difference in sleep duration and total IGF-I levels persisted. Rapid eye movement (REM) sleep, non......Short sleep appears to be strongly associated with obesity and altered metabolic function, and sleep and growth hormone (GH) secretion seems interlinked. In obesity, both the GH-insulin-like-growth-factor-I (GH-IGF-I) axis and sleep have been reported to be abnormal, however, no studies have...

  19. Epidermal growth factor receptor (EGFR) involvement in successful growth hormone (GH) signaling in GH transduction defect.

    Science.gov (United States)

    Kostopoulou, Eirini; Rojas-Gil, Andrea Paola; Karvela, Alexia; Spiliotis, Bessie E

    2017-02-01

    Growth hormone (GH) transduction defect (GHTD) is a growth disorder with impaired signal transducer and activator of transcription 3 (STAT3) phosphorylation mediated by overexpression of cytokine-inducible SH2-containing protein (CIS), which causes increased growth hormone receptor (GHR) degradation. This study investigated the role of epidermal growth factor (EGF) in the restoration of normal GH signaling in GHTD. Protein expression, cellular localization and physical contact of proteins of the GH and EGF signaling pathways were studied by Western immunoblotting, immunofluorescence and co-immunoprecipitation, respectively. These were performed in fibroblasts of one GHTD patient (P) and one control child (C) at the basal state and after induction with human GH (hGH) 200 μg/L (GH200), either with or without silencing of CIS mRNA, and after induction with hGH 1000 μg/L (GH1000) or 50 ng/mL EGF. The membrane availability of the EGF receptor (EGFR) and the activated EGFR (pEGFR) was increased in P only after simultaneous GH200 and silencing of CIS mRNA or with GH1000, whereas this occurred in C after GH200 alone. After EGF induction, the membrane localization of GHR, STAT3 and that of EGFR were increased in P more than in C. In conclusion, in GHTD, the EGFR seems to participate in successful GH signaling, but induction of GHTD fibroblasts with a higher dose of hGH is needed. The EGF/EGFR pathway, in contrast to the GH/GHR pathway, seems to function normally in P and is more primed compared to C. The involvement of the EGFR in successful GH signaling may explain the catch-up growth seen in the Ps when exogenous hGH is administered.

  20. P2X7R suppression promotes glioma growth through epidermal growth factor receptor signal pathway.

    Science.gov (United States)

    Fang, Jingqin; Chen, Xiao; Zhang, Letian; Chen, Jinhua; Liang, Yi; Li, Xue; Xiang, Jianbo; Wang, Lili; Guo, Guangkuo; Zhang, Bo; Zhang, Weiguo

    2013-06-01

    P2X7 receptor (P2X7R) has been shown to mediate an anticancer effect via apoptosis in different types of cancer. However, whether P2X7R exerts a promoting or suppressive effect on brain glioma is still a controversial issue and its underlying mechanism remains unknown. We showed here that P2X7R suppression exerted a pro-growth effect on glioma through directly promoting cells proliferation and pro-angiogenesis, which was associated with epidermal growth factor receptor (EGFR) signaling. The P2X7R was markedly downregulated by cells exposure to the P2X7R antagonist, brilliant blue G (BBG), moreover, the cells proliferation was enhanced in a dose-dependent manner and the expression of EGFR or p-EGFR protein was significantly upregulated. By constructing C6 cells with reduced expression of P2X7R using shRNA, we also demonstrated strong upregulation in cells proliferation and EGFR/p-EGFR expression. However, this effect of BBG was reversed in the presence of gefitinib or suramin. Magnetic resonance imaging and computed tomography perfusion showed that the BBG or P2X7R shRNA promoted the tumor growth by about 40% and 50%, respectively, and significantly increased angiogenesis. Nissl and Ki-67 staining also confirmed that BBG or P2X7R shRNA notably increased the tumor growth. More importantly, either BBG or P2X7R shRNA could markedly upregulated the expression of EGFR, p-EGFR, HIF-1α and VEGF in glioma cells. In conclusion, P2X7R suppression exerts a promoting effect on glioma growth, which is likely to be related to upregulated EGFR, HIF-1α and VEGF expression. These findings provide important clues to the molecular basis of anticancer effect of targeting purinergic receptors. Copyright © 2013 Elsevier Ltd. All rights reserved.

  1. Modern Integration Units: Comparative Analysis Of The Growth Factors

    Directory of Open Access Journals (Sweden)

    Bulat Doskalievich Khusainov

    2015-03-01

    Full Text Available In the article, the results of the research, which purpose is to ground and assess the factors of economic growth of regional integration communities and national economies of member countries that develop them, are presented. The foreign trade, mutual trade turnover, and domestic demand are allocated as such factors. The authors has applied the novelty in their methodology which in contrast to the traditional assessment method of growth factors of integration communities and their participants, is based on comparison of two components — external and domestic demand, based on dividing the external demand on two components: the first one is pure export (the difference between export and import is a component of cumulative demand of goods in integration community, i.e. the pure export of mutual trade; the second one is a pure export of foreign trade of goods outside of the integration association. Scope of the research is seven most known regional integrated units arose at different times and being at different stages of development — the European Union, North American Free Trade Area, Association of Southeast Asian Nations, Southern American Common Market, Asia-Pacific Economic Cooperation, and also member countries of the Eurasian integration — the Customs Union and Common Free Market Zone developed into the Eurasian Economic Union in January 1, 2015. In conclusion, it is noted that the integration develops successfully only in the conditions of the rise in national economies of the participating countries. Crisis economies have to deal more with internal problems than to resolve integration issues.

  2. Role of peptide growth factors in the rhythm of change hair

    Directory of Open Access Journals (Sweden)

    A. A. Kubanov

    2015-01-01

    Full Text Available The article presents current data on the role growth factors play in hair physiology. Based on a review of literature, the authors described the role growth factors play for initiating, suppressing the growth and differentiating hair follicles. According to them, each morphologic development stage of hair follicles is characterized by its own factor expression pattern. Referring to experimental and clinical studies, the authors describe the role some growth factors play for mechanisms promoting the development of androgynous and focal alopecia.

  3. Chronic administration of epidermal growth factor to pigs induces growth, especially of the urinary tract with accumulation of epithelial glycoconjugates

    DEFF Research Database (Denmark)

    Vinter-Jensen, Lars; Juhl, C O; Poulsen, Steen Seier

    1995-01-01

    Epidermal growth factor (EGF) receptor hyperstimulation induced by systemically administered EGF or by the development of transgenic mice overexpressing transforming growth factor alpha (TGF alpha) or other EGF-related ligands is known to induce various effects, such as acceleration of developmen...

  4. Hepatocyte and keratinocyte growth factors and their receptors in human lung emphysema

    Directory of Open Access Journals (Sweden)

    Marchal Joëlle

    2005-10-01

    Full Text Available Abstract Background Hepatocyte and keratinocyte growth factors are key growth factors in the process of alveolar repair. We hypothesized that excessive alveolar destruction observed in lung emphysema involves impaired expression of hepatocyte and keratinocyte growth factors or their respective receptors, c-met and keratinocyte growth factor receptor. The aim of our study was to compare the expression of hepatocyte and keratinocyte growth factors and their receptors in lung samples from 3 groups of patients: emphysema; smokers without emphysema and non-smokers without emphysema. Methods Hepatocyte and keratinocyte growth factor proteins were analysed by immunoassay and western blot; mRNA expression was measured by real time quantitative polymerase chain reaction. Results Hepatocyte and keratinocyte growth factors, c-met and keratinocyte growth factor receptor mRNA levels were similar in emphysema and non-emphysema patients. Hepatocyte growth factor mRNA correlated negatively with FEV1 and the FEV1/FVC ratio both in emphysema patients and in smokers with or without emphysema. Hepatocyte and keratinocyte growth factor protein concentrations were similar in all patients' groups. Conclusion The expression of hepatocyte and keratinocyte growth factors and their receptors is preserved in patients with lung emphysema as compared to patients without emphysema. Hepatocyte growth factor mRNA correlates with the severity of airflow obstruction in smokers.

  5. Growth factors VEGF and TGF-beta1 in peritoneal dialysis

    NARCIS (Netherlands)

    Zweers, M. M.; de Waart, D. R.; Smit, W.; Struijk, D. G.; Krediet, R. T.

    1999-01-01

    The morphologic alterations in the kidney and the retina that can be present in patients with diabetic microangiopathy are mediated by growth factors. Vascular endothelial growth factor (VEGF) is a mediator of neoangiogenesis in diabetic retinopathy. Transforming growth factor-beta (TGF-beta) is

  6. [The concentration of growth factors in patients with inherent and acquired shortenings of limbs bones].

    Science.gov (United States)

    Strogov, M V; Luneva, S N; Novikov, K I

    2013-04-01

    The article deals with the results of study of level of growth factors in blood serum of patients with inherent and post-traumatic shortenings of limbs' bones. The detection in blood serum the level of epidermal growth factor insulin-like growth factor I and angiopoetins is proposed to monitor in given patients the reparative bone formation.

  7. The F-BAR Protein PACSIN2 Regulates Epidermal Growth Factor Receptor Internalization

    NARCIS (Netherlands)

    de Kreuk, Bart-Jan; Anthony, Eloise C.; Geerts, Dirk; Hordijk, Peter L.

    2012-01-01

    Signaling via growth factor receptors, including the epidermal growth factor (EGF) receptor, is key to various cellular processes, such as proliferation, cell survival, and cell migration. In a variety of human diseases such as cancer, aberrant expression and activation of growth factor receptors

  8. The F-BAR protein PACSIN2 regulates epidermal growth factor receptor internalization

    NARCIS (Netherlands)

    B.J. de Kreuk (Bart-Jan); E.C. Anthony (Eloise); D. Geertss (Dirk); P.L. Hordijk (Peter )

    2012-01-01

    textabstractSignaling via growth factor receptors, including the epidermal growth factor (EGF) receptor, is key to various cellular processes, such as proliferation, cell survival, and cell migration. In a variety of human diseases such as cancer, aberrant expression and activation of growth factor

  9. Growth factor-induced contraction of human bronchial smooth muscle is Rho-kinase-dependent

    NARCIS (Netherlands)

    Gosens, Reinout; Schaafsma, D.; Grootte Bromhaar, M.M; Vrugt, B.; Zaagsma, Hans; Meurs, Herman; Nelemans, Herman

    2004-01-01

    Growth factors have been implicated in the pathophysiology of asthma. However, the putative effects of these growth factors on human airway smooth muscle tone are still largely unknown. We performed contraction experiments using human bronchial smooth muscle ring preparations. The growth factor

  10. 47 CFR 36.604 - Calculation of the rural growth factor.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 2 2010-10-01 2010-10-01 false Calculation of the rural growth factor. 36.604..., REVENUES, EXPENSES, TAXES AND RESERVES FOR TELECOMMUNICATIONS COMPANIES 1 Universal Service Fund General § 36.604 Calculation of the rural growth factor. The Rural Growth Factor (RGF) is equal to the sum of...

  11. Expression of the epidermal growth factor system in endometrioid endometrial cancer

    DEFF Research Database (Denmark)

    Ejskjaer, Kirsten; Sørensen, Boe Sandahl; Poulsen, Steen Seier

    2007-01-01

    The Epidermal Growth Factor (EGF) system is expressed in healthy premenopausal endometrium. We describe the expression of the four receptors, HER1, HER2, HER3, HER4 and the six ligands amphiregulin, transforming growth factor alpha (TGF-alpha), heparin binding EGF like growth factor (HB-EGF), bet......-EGF), betacellulin, epiregulin and EGF in endometrioid endometrial cancer....

  12. Chronic treatment with epidermal growth factor stimulates growth of the urinary tract in the rat

    DEFF Research Database (Denmark)

    Vinter-Jensen, Lars; Smerup, Morten Holdgaard; Jørgensen, P E

    1996-01-01

    Twenty-four male Wistar rats, 8 weeks old, were allocated into three groups and treated with human recombinant epidermal growth factor (EGF) administered subcutaneously in doses of 0, 30, and 150 micrograms/kg per day for 4 weeks. Blood sampling was done every 2nd week and urine sampling was done...... differentiation pattern as observed by the expression of carbohydrate epitopes, characterized with lectinohistochemistry. Blood examination revealed a decrease in blood haemoglobin concentration and a slight increase in serum creatinine concentration in the high-dose group. There were no effects of EGF...... on the urinary excretion of electrolytes, proteins, and endogenous EGF....

  13. Overexpression of Heparin-Binding Epidermal Growth Factor-Like Growth Factor Mediates Liver Fibrosis in Transgenic Mice.

    Science.gov (United States)

    Guo, Yongze; Ding, Qian; Chen, Lei; Ji, Chenguang; Hao, Huiyao; Wang, Jia; Qi, Wei; Xie, Xiaoli; Ma, Junji; Li, Aidi; Jiang, Xiaoyu; Li, Xiaotian; Jiang, Huiqing

    2017-08-01

    The role of heparin-binding epidermal growth factor-like growth factor (HB-EGF) in liver fibrosis is not clear and is sometimes even contradictory. To clarify this role, a HB-EGF transgenic (Tg) mouse model was, for the first time, used to evaluate the functions of HB-EGF in liver fibrosis. For the in vivo study, carbon tetrachloride injection and bile duct ligation treatment were used to induce liver fibrosis in HB-EGF Tg mice and wild-type (WT) mice, respectively. Primary hepatic satellite cells (HSCs) were isolated from HB-EGF Tg and WT mice for the in vitro study. Compared with the WT mice, HB-EGF Tg mice were shown to develop more severe liver fibrosis when treated with carbon tetrachloride or bile duct ligation, with increased matrix metalloproteinases 13 activity and enhanced expression of fibrogenic genes including α-smooth muscle actin and collagen I. HB-EGF gene transfer led to an increase in proliferation and a decrease in apoptosis in primary HSCs. The ERK signaling pathway was more highly activated in primary HSCs from HB-EGF Tg mice than in those from WT mice. Our investigation confirmed the profibrotic effect of HB-EGF on the liver using a Tg mouse model. This result may contribute to the elucidation of HB-EGF as a therapeutic target in liver fibrosis. Copyright © 2017 Southern Society for Clinical Investigation. Published by Elsevier Inc. All rights reserved.

  14. An Expandable, Inducible Hemangioblast State Regulated by Fibroblast Growth Factor

    Directory of Open Access Journals (Sweden)

    David T. Vereide

    2014-12-01

    Full Text Available During development, the hematopoietic and vascular lineages are thought to descend from common mesodermal progenitors called hemangioblasts. Here we identify six transcription factors, Gata2, Lmo2, Mycn, Pitx2, Sox17, and Tal1, that “trap” murine cells in a proliferative state and endow them with a hemangioblast potential. These “expandable” hemangioblasts (eHBs are capable, once released from the control of the ectopic factors, to give rise to functional endothelial cells, multilineage hematopoietic cells, and smooth muscle cells. The eHBs can be derived from embryonic stem cells, from fetal liver cells, or poorly from fibroblasts. The eHBs reveal a central role for fibroblast growth factor, which not only promotes their expansion, but also facilitates their ability to give rise to endothelial cells and leukocytes, but not erythrocytes. This study serves as a demonstration that ephemeral progenitor states can be harnessed in vitro, enabling the creation of tractable progenitor cell lines.

  15. Factors Affecting Growth of Pinus radiata in Chile

    Science.gov (United States)

    Alvarez-Munoz, Jose Santos

    The Chilean forestry industry is based on hundreds of thousands of hectares of Pinus radiata plantations that have been established in a variety of soil and climate conditions. This approach has resulted in highly variable plantation productivity even when the best available technology was used. Little information is known about the ecophysiology basis for this variability. We explored the spatial and temporal variation of stand growth in Chile using a network of permanent sample plots from Modelo Nacional de Simulacion de Pino radiata. We hypothesized that the climate would play an important role in the annual variations in productivity. To answer these questions we developed the following projects: (1) Determination of site resource availability from historical data from automatic weather stations (rainfall, temperatures) and a geophysical model for solar irradiation, (2) Determination of peak annual leaf area index (LAI) for selected permanent sample plots using remote sensing technologies, (3) Analysis of soil, climate, canopy and stand factors affecting the Pinus radiata plantation growth and the use efficiency of site resources. For project 1, we estimated solar irradiation using the r.sun , Hargreaves-Samani (HS), and Bristow-Campbell (BC) models and validated model estimates with observations from weather stations. Estimations from a calibrated r.sun model accounted for 94% of the variance (r2=0.94) in monthly mean measured values. The r.sun model performed quite well for a wide range of Chilean conditions when compared with the HS and BC models. Our estimates of global irradiation may be improved with better estimates of cloudiness as they become available. Our model was able to provide spatial estimates of daily, weekly, monthly and yearly solar irradiation. For project 2, we estimated the inter-annual variation of LAI (Leaf Area Index), using remote sensing technologies. We determined LAI using Landsat Thematic Mapper (TM) data covering a 5 year period

  16. Transforming growth factor beta 1, a cytokine with regenerative functions

    Directory of Open Access Journals (Sweden)

    Wale Sulaiman

    2016-01-01

    Full Text Available We review the biology and role of transforming growth factor beta 1 (TGF-β1 in peripheral nerve injury and regeneration, as it relates to injuries to large nerve trunks (i.e., sciatic nerve, brachial plexus, which often leads to suboptimal functional recovery. Experimental studies have suggested that the reason for the lack of functional recovery resides in the lack of sufficient mature axons reaching their targets, which is a result of the loss of the growth-supportive environment provided by the Schwann cells in the distal stump of injured nerves. Using an established chronic nerve injury and delayed repair animal model that accurately mimics chronic nerve injuries in humans, we summarize our key findings as well as others to better understand the pathophysiology of poor functional recovery. We demonstrated that 6 month TGF-β1 treatment for chronic nerve injury significantly improved Schwann cell capacity to support axonal regeneration. When combined with forskolin, the effect was additive, as evidenced by a near doubling of regenerated axons proximal to the repair site. We showed that in vivo application of TGF-β1 and forskolin directly onto chronically injured nerves reactivated chronically denervated Schwann cells, induced their proliferation, and upregulated the expression of regeneration-associated proteins. The effect of TGF-β1 and forskolin on old nerve injuries is quite impressive and the treatment regiment appears to mediate a growth-supportive milieu in the injured peripheral nerves. In summary, TGF-β1 and forskolin treatment reactivates chronically denervated Schwann cells and could potentially be used to extend and prolong the regenerative responses to promote axonal regeneration.

  17. Fibroblast growth factor-mediated proliferation of central nervous system precursors depends on endogenous production of insulin-like growth factor I

    International Nuclear Information System (INIS)

    Drago, J.; Murphy, M.; Carroll, S.M.; Harvey, R.P.; Bartlett, P.F.

    1991-01-01

    Fibroblast growth factor stimulates proliferation and subsequent differentiation of precursor cells isolated from the neuroepithelium of embryonic day 10 mice in vitro. Here we show that fibroblast growth factor-induced proliferation is dependent on the presence of insulin-like growth factors (IGFs) and that IGF-I is endogenously produced by the neuroepithelial cells. Blocking of endogenous IGF-I activity with anti-IGF-I antibodies results in complete inhibition of fibroblast growth factor-mediated proliferation and in cell death. IGF-I alone acts as a survival agent. These observations correlate with the detection of transcripts for IGF-I and basic fibroblast growth factor in freshly isolated neuroepithelium and are consistent with an autocrine action of these factors in early brain development in vivo

  18. Keratinocyte growth factor mRNA expression in periodontal ligament fibroblasts

    DEFF Research Database (Denmark)

    Dabelsteen, S; Wandall, H H; Grøn, B

    1997-01-01

    Keratinocyte growth factor (KGF) is a fibroblast growth factor which mediates epithelial growth and differentiation. KGF is expressed in subepithelial fibroblasts, but generally not in fibroblasts of deep connective tissue, such as fascia and ligaments. Here we demonstrate that KGF mRNA is expres......Keratinocyte growth factor (KGF) is a fibroblast growth factor which mediates epithelial growth and differentiation. KGF is expressed in subepithelial fibroblasts, but generally not in fibroblasts of deep connective tissue, such as fascia and ligaments. Here we demonstrate that KGF m...

  19. Magnetic fluid hyperthermia inhibits the growth of breast carcinoma and downregulates vascular endothelial growth factor expression

    Science.gov (United States)

    WANG, GUIHUA; XU, DERONG; CHAI, QIN; TAN, XIAOLANG; ZHANG, YU; GU, NING; TANG, JINTIAN

    2014-01-01

    The application of magnetic fluid hyperthermia (MFH) with nanoparticles has been shown to inhibit tumor growth in several animal models. However, the feasibility of using MFH in vivo to treat breast cancer is uncertain, and the mechanism is unclear. In the present study, it was observed that the intratumoral administration of MFH induced hyperthermia significantly in rats with Walker-265 breast carcinomas. The hyperthermia treatment with magnetic nanoparticles inhibited tumor growth in vivo and promoted the survival of the tumor-bearing rats. Furthermore, it was found that MFH treatment downregulated the protein expression of vascular endothelial growth factor (VEGF) in the tumor tissue, as observed by immunohistochemistry. MFH treatment also decreased the gene expression of VEGF and its receptors, VEGF receptor 1 and 2, and inhibited angiogenesis in the tumor tissues. Taken together, these results indicate that the application of MFH with nanoparticles is feasible for the treatment of breast carcinoma. The MFH-induced downregulation of angiogenesis may also contribute to the induction of an anti-tumor effect. PMID:24765139

  20. Fibroblast growth factor-10 is a mitogen for urothelial cells

    Energy Technology Data Exchange (ETDEWEB)

    Bagai, Shelly; Rubio, Eric; Cheng, Jang-Fang; Sweet, Robert; Thomas, Regi; Fuchs, Elaine; Grady, Richard; Mitchell, Michael; Bassuk, James A.

    2002-02-01

    Fibroblast Growth Factor (FGF)-10 plays an important role in regulating growth, differentiation, and repair of the urothelium. This process occurs through a paracrine cascade originating in the mesenchyme (lamina propria) and targeting the epithelium (urothelium). In situ hybridization analysis demonstrated that (i) fibroblasts of the human lamina propria were the cell type that synthesized FGF-10 RNA and (ii) the FGF-10 gene is located at the 5p12-p13 locus of chromosome 5. Recombinant (r) preparations of human FGF-10 were found to induce proliferation of human urothelial cells in vitro and of transitional epithelium of wild-type and FGF7-null mice in vivo. Mechanistic studies with human cells indicated two modes of FGF-10 action: (i) translocation of rFGF-10 into urothelial cell nuclei and (ii) a signaling cascade that begins with the heparin-dependent phosphorylation of tyrosine residues of surface transmembrane receptors. The normal urothelial phenotype, that of quiescence, is proposed to be typified by negligible levels of FGF-10. During proliferative phases, levels of FGF-10 rise at the urothelial cell surface and/or within urothelial cell nuclei. An understanding of how FGF-10 works in conjunction with these other processes will lead to better management of many diseases of the bladder and urinary tract.

  1. Insulin-like growth factor I: a biologic maturation indicator.

    Science.gov (United States)

    Ishaq, Ramy Abdul Rahman; Soliman, Sanaa Abou Zeid; Foda, Manal Yehya; Fayed, Mona Mohamed Salah

    2012-11-01

    Determination of the maturation level and the subsequent evaluation of growth potential during preadolescence and adolescence are important for optimal orthodontic treatment planning and timing. This study was undertaken to evaluate the applicability of insulin-like growth factor I (IGF-I) blood level as a maturation indicator by correlating it to the cervical vertebral maturation index. The study was conducted with 120 subjects, equally divided into 60 males (ages, 10-18 years) and 60 females (ages, 8-16 years). A lateral cephalometric radiograph and a blood sample were taken from each subject. For each subject, cervical vertebral maturation and IGF-I serum level were assessed. Mean values of IGF-I in each stage of cervical vertebral maturation were calculated, and the means in each stage were statistically compared with those of the other stages. The IGF-I mean value at each cervical vertebral maturation stage was statistically different from the mean values at the other stages. The highest mean values were observed in stage 4, followed by stage 5 in males and stage 3 in females. IGF-I serum level is a reliable maturation indicator that could be applied in orthodontic diagnosis. Copyright © 2012 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.

  2. Targeting the epidermal growth factor receptor in solid tumor malignancies

    DEFF Research Database (Denmark)

    Nedergaard, Mette K; Hedegaard, Chris J; Poulsen, Hans S

    2012-01-01

    to the extracellular part of EGFR, blocking the binding sites for the EGFR ligands, and intracellular tyrosine kinase inhibitors (TKIs) that block the ATP binding site of the tyrosine kinase domain. Besides an EGFRvIII-targeted vaccine, conjugated anti-EGFR mAbs have been used in different settings to deliver lethal......The epidermal growth factor receptor (EGFR) is over-expressed, as well as mutated, in many types of cancers. In particular, the EGFR variant type III mutant (EGFRvIII) has attracted much attention as it is frequently and exclusively found on many tumor cells, and hence both EGFR and EGFRvIII have...... been proposed as valid targets in many cancer therapy settings. Different strategies have been developed in order to either inhibit EGFR/EGFRvIII activity or to ablate EGFR/EGFRvIII-positive tumor cells. Drugs that inhibit these receptors include monoclonal antibodies (mAbs) that bind...

  3. Insulin and insulin-like growth factor receptors and responses

    International Nuclear Information System (INIS)

    Roth, R.A.; Steele-Perkins, G.; Hari, J.; Stover, C.; Pierce, S.; Turner, J.; Edman, J.C.; Rutter, W.J.

    1988-01-01

    Insulin is a member of a family of structurally related hormones with diverse physiological functions. In humans, the best-characterized members of this family include insulin, insulin-like growth factor (IGF)-I, and IGF-II. Each of these three polypeptide hormones has its own distinct receptor. The structures of each of these receptors have now been deduced from analyses of isolated cDNA clones. To study further the responses mediated through these three different receptors, the authors have been studying cells expressing the proteins encoded by these three cDNAs. The isolated cDNAs have been transfected into Chinese hamster ovary (CHO) cells, and the resulting transfected cell lines have been characterized as to the ligand-binding activities and signal-transducing activities of the expressed proteins

  4. Molecular analysis of the nerve growth factor receptor

    International Nuclear Information System (INIS)

    Hempstead, B.; Patil, N.; Olson, K.; Chao, M.

    1988-01-01

    An essential molecule in the translocation of information by nerve growth factor (NGF) to responsive cells is the cell-surface receptor for NGF. This paper presents information on the genomic structure of the NGF receptor gene, NGF receptor models, and transfection of NGF receptors. Equilibrium binding of [ 125 I]NGF to cells reveals two distinct affinity states for the NGF receptor. The human NGF receptor gene is a single-copy gene, consisting of six exons that span 23 kb. The receptor gene is capable of being transferred to fibroblast cells from human genomic DNA and expressed at high levels. The constitutive nature of the receptor promoter sequence is a partial explanation of why this tissue-specific gene is expressed efficiently in a variety of nonneuronal cells after genomic gene transfer. The two kinetic forms of the NGF receptor appear to be encoded by the same protein, which is the product of a single gene

  5. Signal transduction by growth factor receptors: signaling in an instant

    DEFF Research Database (Denmark)

    Dengjel, Joern; Akimov, Vyacheslav; Blagoev, Blagoy

    2007-01-01

    -out by mass spectrometry-based proteomics has allowed exciting views on the very early events in signal transduction. Activation profiles of regulated phosphorylation sites on epidermal growth factor receptor and downstream signal transducers showed different kinetics within the first ten seconds......Phosphorylation-based signaling events happening within the first minute of receptor stimulation have so far only been analyzed by classical cell biological approaches like live-cell microscopy. The development of a quench flow system with a time resolution of one second coupled to a read...... of stimulation. This new technique opens the perspectives for accurate analysis of rapid cellular processes and will help to establish models describing signal initiation at the plasma membrane....

  6. Immunolocalization of transforming growth factor alpha in normal human tissues

    DEFF Research Database (Denmark)

    Christensen, M E; Poulsen, Steen Seier

    1996-01-01

    the distribution of the growth factor in a broad spectrum of normal human tissues. Indirect immunoenzymatic staining methods were used. The polypeptide was detected with a polyclonal as well as a monoclonal antibody. The polyclonal and monoclonal antibodies demonstrated almost identical immunoreactivity. TGF......-alpha was found to be widely distributed in cells of normal human tissues derived from all three germ layers, most often in differentiated cells. In epithelial cells, three different kinds of staining patterns were observed, either diffuse cytoplasmic, cytoplasmic in the basal parts of the cells, or distinctly...... localized adjacent to the nucleus, usually on the luminal aspect, corresponding to the localization of the Golgi complex. The latter staining pattern was seen predominantly in secretory epithelial cells. The present study thus confirms previous studies and elaborates new localizations of TGF-alpha in normal...

  7. Growth hormone increases and insulin-like growth factor-I decreases circulating lipoprotein(a)

    Science.gov (United States)

    Laron, Z; Wang, X L; Klinger, B; Silbergeld, A; Wilcken, D E

    1997-04-01

    Elevated serum lipoprotein(a) (Lp(a)) is a strong risk factor for coronary artery disease (CAD). Genetic factors appear to account for the major variance in Lp(a) levels but the contribution hormones make in modulating Lp(a) levels is not yet clear. In the present investigation we determined the effects of human growth hormone (hGH) and insulin-like growth factor-I (IGF-I) on circulating Lp(a). Four groups of patients were studied. Group a: adults with GH deficiency (n = 7) treated with hGH (0.05 U/kg/day, s.c.); group b: girls with Turner syndrome (n = 7) treated with hGH (0.1 U/kg/day, s.c.); group c: prepubertal boys with idiopathic short stature (n = 6) treated with the GH secretagogue (GHRP) hexarelin (60 micrograms t.i.d. intranasally); group d: Laron syndrome patients (n = 10) treated with IGF-I (100-200 micrograms/kg/day, s.c.). Following overnight fasting, serum was sampled before the initiation of treatment and during 6-9 months treatment. Serum IGF-I rose significantly in all the subjects in all four groups. In the first three groups in which IGF-I was elevated by exogenous or endogenous GH stimulation, serum Lp(a) increased significantly (119 +/- 35%, P hGH or GHRP (65.2 +/- 31%, P = 0.109; 93.7 +/- 53%, P = 0.062; 353.8 +/- 52.7%, P hGH in children and adults and the role of Lp(a) as a CAD risk factor.

  8. Iron status and fibroblast growth factor-23 in Gambian children

    Science.gov (United States)

    Braithwaite, Vickie; Jarjou, Landing M.A.; Goldberg, Gail R.; Prentice, Ann

    2012-01-01

    A relationship between iron and fibroblast growth factor-23 (FGF23) metabolic pathways has been proposed. Iron deficiency anaemia is prevalent in The Gambia and concentrations of fibroblast growth factor-23 FGF23 are elevated in a large percentage of Gambian children with rickets-like bone deformity. We speculate that low iron status may be involved in the aetiology of Gambian rickets. The aim of this study was to determine if there was a relationship between haemoglobin, as a marker of iron status, and FGF23 in samples from children with and without a history of rickets-like bone deformities in The Gambia. We conducted a retrospective analysis of studies carried out from 2006 to 2008 in children from a rural community in The Gambia where iron deficiency anaemia is endemic and where elevated circulating concentrations of FGF23 have been found. To investigate the relationship between circulating FGF23 and haemoglobin concentrations we used an age-adjusted linear regression model on data from children rickets-like bone deformity (BD) (n = 108) and from the local community (LC) (n = 382). We found that circulating concentration of FGF23 was inversely correlated with haemoglobin concentration. This effect was more pronounced in BD children compared with LC children (interaction: P ≤ 0.0001). Anaemia and elevated FGF23 were more prevalent in BD children compared to LC children (P = 0.0003 and P = 0.0001 respectively). In conclusion, there is a stronger relationship between FGF23 and haemoglobin in Gambian children with a history of rickets compared to local community children. This study provides support for the contention that iron may be involved in FGF23 metabolic pathways. PMID:22465847

  9. Fibroblast Growth Factor-23—A Potential Uremic Toxin

    Directory of Open Access Journals (Sweden)

    Piotr Kuczera

    2016-12-01

    Full Text Available Fibroblast growth factor-23 (FGF23 is a circulating member of the FGF family produced mainly by the osteocytes and osteoblasts that can act as a hormone. The main action of FGF23 is to lower phosphatemia via the reduction of urinary phosphate reabsorption and the decrease of 1,25(OH2-D generation in the kidney. In the course of chronic kidney disease (CKD, plasma FGF23 concentration rises early, most probably to compensate the inability of the deteriorating kidneys to excrete an adequate amount of phosphate. However, this comes at the cost of FGF23-related target organ toxicity. Results of clinical studies suggest that elevated plasma FGF23 concentration is independently associated with the increased risk of CKD progression, occurrence of cardio-vascular complications, and mortality in different stages of CKD. FGF23 also contributes to cardiomyocyte hypertrophy, vascular calcification, and endothelial dysfunction. The impact of FGF23 on heart muscle is not dependent on Klotho, but rather on the PLCγ–calcineurin–NFAT (nuclear factor of activated T-cells pathway. Among the factors increasing plasma FGF23 concentration, active vitamin D analogues play a significant role. Additionally, inflammation and iron deficiency can contribute to the increase of plasma FGF23. Among the factors decreasing plasma FGF23, dietary phosphate restriction, some intestinal phosphate binders, cinacalcet (and other calcimimetics, and nicotinamide can be enumerated. Anti-FGF23 antibodies have also recently been developed to inhibit the action of FGF23 in target organs. Still, the best way to normalize plasma FGF23 in maintenance hemodialysis patients is restoring kidney function by successful kidney transplantation.

  10. Systemic treatment with Epidermal Growth Factor (EGF)but not Insulin like Growth Factor (IGF-I) decrease the involution of the Prostate in Castrated Rats

    DEFF Research Database (Denmark)

    Tørring, Niels; Lars, Vinter-Jensen; Sørensen, Flemming Brandt

    2000-01-01

    Epidermal growth factor (EGF) and insulin-like growth factor I (IGF-I) are strong inducers of proliferation to prostate cells cultured in serum-free medium. Accordingly we wanted to study the growth of the prostate gland in castrated rats after treatment with EGF, IGF-I and testosterone. Castrated...... Wistar rats were treated with growth factors (EGF 35 microg/rat per day; IGF-I 350 microg/rat per day) or testosterone (2 mg/rat per day) for 3 days either immediately after or 10 days after castration. Prostate tissue was examined by stereological and immunohistochemical techniques and by enzyme...

  11. Systemic treatment with epidermal growth factor but not insulin-like growth factor I decreases the involution of the prostate in castrated rats

    DEFF Research Database (Denmark)

    Tørring, N; Vinter-Jensen, L; Sørensen, Flemming Brandt

    2000-01-01

    Epidermal growth factor (EGF) and insulin-like growth factor I (IGF-I) are strong inducers of proliferation to prostate cells cultured in serum-free medium. Accordingly we wanted to study the growth of the prostate gland in castrated rats after treatment with EGF, IGF-I and testosterone. Castrated...... Wistar rats were treated with growth factors (EGF 35 microg/rat per day; IGF-I 350 microg/rat per day) or testosterone (2 mg/rat per day) for 3 days either immediately after or 10 days after castration. Prostate tissue was examined by stereological and immunohistochemical techniques and by enzyme...

  12. Chicken stem cell factor enhances primordial germ cell proliferation cooperatively with fibroblast growth factor 2.

    Science.gov (United States)

    Miyahara, Daichi; Oishi, Isao; Makino, Ryuichi; Kurumisawa, Nozomi; Nakaya, Ryuma; Ono, Tamao; Kagami, Hiroshi; Tagami, Takahiro

    2016-04-22

    An in vitro culture system of chicken primordial germ cells (PGCs) has been recently developed, but the growth factor involved in the proliferation of PGCs is largely unknown. In the present study, we investigated the growth effects of chicken stem cell factor (chSCF) on the in vitro proliferation of chicken PGCs. We established two feeder cell lines (buffalo rat liver cells; BRL cells) that stably express the putative secreted form of chSCF (chSCF1-BRL) and membrane bound form of chSCF (chSCF2-BRL). Cultured PGC lines were incubated on chSCF1 or chSCF2-BRL feeder cells with fibroblast growth factor 2 (FGF2), and growth effects of each chSCF isoform were investigated. The in vitro proliferation rate of the PGCs cultured on chSCF2-BRL at 20 days of culture was more than threefold higher than those cultured on chSCF1-BRL cells and more than fivefold higher than those cultured on normal BRL cells. Thus, use of chSCF2-BRL feeder layer was effective for in vitro proliferation of chicken PGCs. However, the acceleration of PGC proliferation on chSCF2-BRL was not observed without FGF2, suggesting that chSCF2 would act as a proliferation co-factor of FGF2. We transferred the PGCs cultured on chSCF2-BRL cells to recipient embryos, generated germline chimeric chickens and assessed the germline competency of cultured PGCs by progeny test. Donor-derived progenies were obtained, and the frequency of germline transmission was 3.39%. The results of this study demonstrate that chSCF2 induces hyperproliferation of chicken PGCs retaining germline competency in vitro in cooperation with FGF2.

  13. E-cadherin homophilic ligation inhibits cell growth and epidermal growth factor receptor signaling independently of other cell interactions

    DEFF Research Database (Denmark)

    Perrais, Michaël; Chen, Xiao; Perez-Moreno, Mirna

    2007-01-01

    growth inhibitory signals. To address this question, we have selectively formed E-cadherin homophilic bonds at the cell surface of isolated epithelial cells by using functionally active recombinant E-cadherin protein attached to microspheres. We find that E-cadherin ligation alone reduces the frequency...... of cells entering the S phase, demonstrating that E-cadherin ligation directly transduces growth inhibitory signals. E-cadherin binding to beta-catenin is required for cell growth inhibition, but beta-catenin/T-cell factor transcriptional activity is not involved in growth inhibition resulting from...... homophilic binding. Neither E-cadherin binding to p120-catenin nor beta-catenin binding to alpha-catenin, and thereby the actin cytoskeleton, is required for growth inhibition. E-cadherin ligation also inhibits epidermal growth factor (EGF) receptor-mediated growth signaling by a beta...

  14. Flow cytometric detection of growth factor receptors in autografts and analysis of growth factor concentrations in autologous stem cell transplantation: possible significance for platelet recovery

    DEFF Research Database (Denmark)

    Schiødt, I; Jensen, Charlotte Harken; Kjaersgaard, E

    2000-01-01

    In order to improve prediction of hematopoietic recovery, we conducted a pilot study, analyzing the significance of growth factor receptor expression in autografts as well as endogenous growth factor levels in blood before, during and after stem cell transplantation. Three early acting (stem cell...

  15. Stimulation of chondrocytes in vitro by gene transfer with plasmids coding for epidermal growth factor (hEGF) and basic fibroblast growth factor (bFGF)

    DEFF Research Database (Denmark)

    Schmal, H; Mehlhorn, A T; Zwingmann, J

    2005-01-01

    Human epidermal growth factor (hEGF) and basic fibroblast growth factor (bFGF) influence critical characteristics of chondrocytes. The effects on metabolism and differentiation were evaluated following transfection using specific plasmids coding for both cytokines. Chondrocytes were isolated from...

  16. Adipocytes enhance murine pancreatic cancer growth via a hepatocyte growth factor (HGF)-mediated mechanism.

    Science.gov (United States)

    Ziegler, Kathryn M; Considine, Robert V; True, Eben; Swartz-Basile, Deborah A; Pitt, Henry A; Zyromski, Nicholas J

    2016-04-01

    Obesity accelerates the development and progression of pancreatic cancer, though the mechanisms underlying this association are unclear. Adipocytes are biologically active, producing factors such as hepatocyte growth factor (HGF) that may influence tumor progression. We therefore sought to test the hypothesis that adipocyte-secreted factors including HGF accelerate pancreatic cancer cell proliferation. Murine pancreatic cancer cells (Pan02 and TGP-47) were grown in a) conditioned medium (CM) from murine F442A preadipocytes, b) HGF-knockdown preadipocyte CM, c) recombinant murine HGF at increasing doses, and d) CM plus HGF-receptor (c-met) inhibitor. Cell proliferation was measured using the MTT assay. ANOVA and t-test were applied; p TGP-47 cell proliferation relative to control (59 ± 12% and 34 ± 12%, p TGP-47 cells remained unchanged. Recombinant HGF dose-dependently increased Pan02, but not TGP-47, proliferation (p TGP-47 cells. These experiments demonstrate that adipocyte-derived factors accelerate murine pancreatic cancer proliferation. In the case of Pan02 cells, HGF is responsible, in part, for this proliferation. Copyright © 2016 IJS Publishing Group Limited. Published by Elsevier Ltd. All rights reserved.

  17. Mechanisms of Hepatocyte Growth Factor Activation in Cancer Tissues

    International Nuclear Information System (INIS)

    Kawaguchi, Makiko; Kataoka, Hiroaki

    2014-01-01

    Hepatocyte growth factor/scatter factor (HGF/SF) plays critical roles in cancer progression through its specific receptor, MET. HGF/SF is usually synthesized and secreted as an inactive proform (pro-HGF/SF) by stromal cells, such as fibroblasts. Several serine proteases are reported to convert pro-HGF/SF to mature HGF/SF and among these, HGF activator (HGFA) and matriptase are the most potent activators. Increased activities of both proteases have been observed in various cancers. HGFA is synthesized mainly by the liver and secreted as an inactive pro-form. In cancer tissues, pro-HGFA is likely activated by thrombin and/or human kallikrein 1-related peptidase (KLK)-4 and KLK-5. Matriptase is a type II transmembrane serine protease that is expressed by most epithelial cells and is also synthesized as an inactive zymogen. Matriptase activation is likely to be mediated by autoactivation or by other trypsin-like proteases. Recent studies revealed that matriptase autoactivation is promoted by an acidic environment. Given the mildly acidic extracellular environment of solid tumors, matriptase activation may, thus, be accelerated in the tumor microenvironment. HGFA and matriptase activities are regulated by HGFA inhibitor (HAI)-1 (HAI-1) and/or HAI-2 in the pericellular microenvironment. HAIs may have an important role in cancer cell biology by regulating HGF/SF-activating proteases

  18. Mechanisms of Hepatocyte Growth Factor Activation in Cancer Tissues

    Energy Technology Data Exchange (ETDEWEB)

    Kawaguchi, Makiko; Kataoka, Hiroaki, E-mail: mejina@med.miyazaki-u.ac.jp [Section of Oncopathology and Regenerative Biology, Department of Pathology, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692 (Japan)

    2014-09-29

    Hepatocyte growth factor/scatter factor (HGF/SF) plays critical roles in cancer progression through its specific receptor, MET. HGF/SF is usually synthesized and secreted as an inactive proform (pro-HGF/SF) by stromal cells, such as fibroblasts. Several serine proteases are reported to convert pro-HGF/SF to mature HGF/SF and among these, HGF activator (HGFA) and matriptase are the most potent activators. Increased activities of both proteases have been observed in various cancers. HGFA is synthesized mainly by the liver and secreted as an inactive pro-form. In cancer tissues, pro-HGFA is likely activated by thrombin and/or human kallikrein 1-related peptidase (KLK)-4 and KLK-5. Matriptase is a type II transmembrane serine protease that is expressed by most epithelial cells and is also synthesized as an inactive zymogen. Matriptase activation is likely to be mediated by autoactivation or by other trypsin-like proteases. Recent studies revealed that matriptase autoactivation is promoted by an acidic environment. Given the mildly acidic extracellular environment of solid tumors, matriptase activation may, thus, be accelerated in the tumor microenvironment. HGFA and matriptase activities are regulated by HGFA inhibitor (HAI)-1 (HAI-1) and/or HAI-2 in the pericellular microenvironment. HAIs may have an important role in cancer cell biology by regulating HGF/SF-activating proteases.

  19. [Fibroblast growth factor 23 in chronic kidney disease in children].

    Science.gov (United States)

    Okarska-Napierała, Magdalena; Skrzypczyk, Piotr; Pańczyk-Tomaszewska, Małgorzata

    2016-06-01

    Cardiovascular risk in children with chronic kidney disease (CKD) is many times higher compared to their healthy peers, and discovered in year 2000 fibroblast growth factor 23 (FGF23) may be one of the factors responsible. FGF23 together with its cofactor, α-Klotho protein, plays a pivotal role in calcium-phosphorus metabolism in patients with CKD by decreasing secretion of active metabolite of vitamin D and antagonizing phosphate resorption in renal tubules. Studies conducted in recent years revealed that FGF23 directly binds to its receptor on cardiomyocytes and promotes left ventricular hypertrophy. Clinical trials in children with CKD, similarly to adult studies, suggest a key role of this protein in development of calciumphosphorus disturbances. Single studies in small patient groups suggest also a significance of FGF23 in pathogenesis of cardiovascular alterations in this population. Further clinical trials investigating role of FGF23 in development of cardiovascular damage in larger groups of children are necessary, which may open new therapeutic options for these patients in future. © 2016 MEDPRESS.

  20. Placental Induced Growth Factor (PIGf) in Coronary Artery Disease

    Science.gov (United States)

    Sundaresan, Alamelu; Carabello, Blaise; Mehta, Satish; Schlegel, Todd; Pellis, Neal; Ott, Mark; Pierson, Duane

    2010-01-01

    Our previous studies on normal human lymphocytes have shown a five-fold increase (p less than 0.001) in angiogenic inducers such as Placental Induced Growth Factor (PIGf) in physiologically stressful environments such as modeled microgravity, a space analog. This suggests de-regulation of cardiovascular signalling pathways indicated by upregulation of PIGf. In the current study, we measured PIGf in the plasma of 33 patients with and without coronary artery disease (CAD) to investigate whether such disease is associated with increased levels of PIGf. A control consisting of 31 sex matched apparently healthy subjects was also included in the study. We observed that the levels of PIGf in CAD patients were significantly increased compared to those in healthy control subjects (p less than 0.001) and usually increased beyond the clinical threshold level (greater than 27ng/L). The mechanisms leading to up-regulation of angiogenic factors and the adaptation of organisms to stressful environments such as isolation, high altitude, hypoxia, ischemia, microgravity, increased radiation, etc are presently unknown and require further investigation in spaceflight and these other physiologically stressed environments.

  1. Insulin-Like Growth Factor-1 Deficiency and Cirrhosis Establishment

    Science.gov (United States)

    de la Garza, Rocio G.; Morales-Garza, Luis Alonso; Martin-Estal, Irene; Castilla-Cortazar, Inma

    2017-01-01

    Cirrhosis represents the final stage of chronic liver damage, which can be due to different factors such as alcohol, metabolic syndrome with liver steatosis, autoimmune diseases, drugs, toxins, and viral infection, among others. Nowadays, cirrhosis is an important health problem and it is an increasing cause of morbidity and mortality, being the 14th most common cause of death worldwide. The physiopathological pathways that lead to fibrosis and finally cirrhosis partly depend on the etiology. Nevertheless, some common features are shared in this complex mechanism. Recently, it has been demonstrated that cirrhosis is a dynamic process that can be altered in order to delay or revert fibrosis. In addition, when cirrhosis has been established, insulin-like growth factor-1 (IGF-1) deficiency or reduced availability is a common condition, independently of the etiology of chronic liver damage that leads to cirrhosis. IGF-1 deprivation seriously contributes to the progressive malnutrition of cirrhotic patient, increasing the vulnerability of the liver to establish an inflammatory and oxidative microenvironment with mitochondrial dysfunction. In this context, IGF-1 deficiency in cirrhotic patients can justify some of the common characteristics of these individuals. Several studies in animals and humans have been done in order to test the replacement of IGF-1 as a possible therapeutic option, with promising results. PMID:28270882

  2. Factors involved in anaerobic growth of Saccharomyces cerevisiae.

    Science.gov (United States)

    Ishtar Snoek, I S; Yde Steensma, H

    2007-01-01

    Life in the absence of molecular oxygen requires several adaptations. Traditionally, the switch from respiratory metabolism to fermentation has attracted much attention in Saccharomyces cerevisiae, as this is the basis for the use of this yeast in the production of alcohol and in baking. It has also been clear that under anaerobic conditions the yeast is not able to synthesize sterols and unsaturated fatty acids and that for anaerobic growth these have to be added to the media. More recently it has been found that many more factors play a role. Several other biosynthetic reactions also require molecular oxygen and the yeast must have alternatives for these. In addition, the composition of the cell wall and cell membrane show major differences when aerobic and anaerobic cells are compared. All these changes are reflected by the observation that the transcription of more than 500 genes changes significantly between aerobically and anaerobically growing cultures. In this review we will give an overview of the factors that play a role in the survival in the absence of molecular oxygen. Copyright (c) 2007 John Wiley & Sons, Ltd.

  3. Transforming growth factor-beta1 stimulates the production of insulin-like growth factor-I and insulin-like growth factor-binding protein-3 in human bone marrow stromal osteoblast progenitors

    DEFF Research Database (Denmark)

    Kveiborg, Marie; Flyvbjerg, Allan; Eriksen, E F

    2001-01-01

    While transforming growth factor-beta1 (TGF-beta1) regulates proliferation and differentiation of human osteoblast precursor cells, the mechanisms underlying these effects are not known. Several hormones and locally acting growth factors regulate osteoblast functions through changes in the insulin......-like growth factors (IGFs) and IGF-binding proteins (IGFBPs). Thus, we studied the effects of TGF-beta1 on IGFs and IGFBPs in human marrow stromal (hMS) osteoblast precursor cells. TGF-beta1 increased the steady-state mRNA level of IGF-I up to 8.5+/-0.6-fold (P...

  4. The Association between Insulin-like Growth Factor-1 and Insulin-like Growth Factor Binding Protein-3 Levels and Clinical Prognosis in Patients with Ischemic Stroke

    Directory of Open Access Journals (Sweden)

    Hasan Yaşar

    2015-04-01

    Full Text Available OBJECTIVE: Recent studies report that the insulin-like growth factor system may be involved in stroke pathogenesis, and is reported to increase myelination, maturation, cell proliferation and neuronal sprouting of the central nervous system. The aim of the present study is to demonstrate the role of insulin-like growth factor system in ischemic stroke pathogenesis and its association with the prognosis by investigating insulin-like growth factor-1 and insulin-like growth factor binding protein-3 levels in patients diagnosed with acute ischemic stroke. METHODS: : Sixty-eight patients and 20 healthy individuals were included to this study. Clinical evaluation of the patients was performed according to National Institute of Health Stroke Scale and functional outcomes were graded according to Modified Rankin Scale. Bamford classification was used for the clinical classification of ischemic strokes, and the TOAST system for etiological classification. Each patient's levels of insulin-like growth factor-1 and insulin-like growth factor binding protein-3 were measured on the first, fifth and thirtieth day of ischemic stroke. RESULTS: Only the levels of insulin-like growth factor binding protein-3 on the day of 5 were significantly decreased compared to the control group. The decrease in IGF-1 values was associated with an increased risk of death and was accompanied by clinical worsening and decreased functionality. CONCLUSION: It has been concluded that the levels of investigating insulin-like growth factor-1 and insulin-like growth factor binding protein-3 may affect mortality risk, clinical condition and functionality outcomes in patients presenting with ischemic stroke, and further studies are needed for the investigation of different effects of insulin-like growth factor-1 in future.

  5. Transforming growth factor-beta, but not ciliary neurotrophic factor, inhibits DNA synthesis of adrenal medullary cells in vitro

    DEFF Research Database (Denmark)

    Wolf, N; Krohn, K; Bieger, S

    1999-01-01

    by the neuroendocrine chromaffin cells, which also express the transforming growth factor-beta receptor type II. In contrast to the developmentally related sympathetic neurons, chromaffin cells continue to proliferate throughout postnatal life. Using 5-bromo-2'-deoxyuridine pulse labeling and tyrosine hydroxylase......Transforming growth factor-betas are members of a superfamily of multifunctional cytokines regulating cell growth and differentiation. Their functions in neural and endocrine cells are not well understood. We show here that transforming growth factor-betas are synthesized, stored and released...... immunocytochemistry as a marker for young postnatal rat chromaffin cells, we show that treatment with fibroblast growth factor-2 (1 nM) and insulin-like growth factor-II (10 nM) increased the fraction of 5-bromo-2'-deoxyuridine-labeled nuclei from 1% to about 40% of the cells in the absence of serum. In the presence...

  6. Effects of transforming growth factor-beta1 and vascular endothelial growth factor 165 gene transfer on Achilles tendon healing.

    Science.gov (United States)

    Hou, Yu; Mao, ZeBin; Wei, XueLei; Lin, Lin; Chen, LianXu; Wang, HaiJun; Fu, Xin; Zhang, JiYing; Yu, Changlong

    2009-07-01

    Repaired Achilles tendons typically take weeks before they are strong enough to handle physiological loads. Gene therapy is a promising treatment for Achilles tendon defects. The aim of the present study was to evaluate the histological/biomechanical effects of Transforming growth factor-beta1 (TGF-beta1) and vascular endothelial growth factor 165 (VEGF(165)) gene transfer on Achilles tendon healing in rabbits. Bone Marrow-Derived Mesenchymal Stem Cells (BMSCs) were transduced with adenovirus carrying human TGF-beta1 cDNA (Ad-TGF-beta1), human VEGF(165) cDNA (Ad-VEGF(165)), or both (PIRES-TGF-beta1/VEGF(165)) Viruses, no cDNA (Ad-GFP), and the BMSCs without gene transfer and the intact tendon were used as control. BMSCs were surgically implanted into the experimentally injured Achilles tendons. TGF-beta1 distribution, cellularity, nuclear aspect ratio, nuclear orientation angle, vascular number, collagen synthesis, and biomechanical features were measured at 1, 2, 4, and 8 weeks after surgery. The TGF-beta1 and TGF beta 1/VEGF(165) co-expression groups exhibited improved parameters compared with other groups, while the VEGF(165) expression group had a negative impact. In the co-expression group, the angiogenesis effects of VEGF(165) were diminished by TGF-beta1, while the collagen synthesis effects of TGF-beta1 were unaltered by VEGF(165). Thus treatment with TGF-beta1 cDNA-transduced BMSCs grafts is a promising therapy for acceleration and improvement of tendon healing, leading to quicker recovery and improved biomechanical properties of Achilles tendons.

  7. Fibroblast Growth Factor 10-Fibroblast Growth Factor Receptor 2b Mediated Signaling Is Not Required for Adult Glandular Stomach Homeostasis

    Science.gov (United States)

    Sala, Frederic G.; Ford, Henri R.; Bellusci, Saverio; Grikscheit, Tracy C.

    2012-01-01

    The signaling pathways that are essential for gastric organogenesis have been studied in some detail; however, those that regulate the maintenance of the gastric epithelium during adult homeostasis remain unclear. In this study, we investigated the role of Fibroblast growth factor 10 (FGF10) and its main receptor, Fibroblast growth factor receptor 2b (FGFR2b), in adult glandular stomach homeostasis. We first showed that mouse adult glandular stomach expressed Fgf10, its receptors, Fgfr1b and Fgfr2b, and most of the other FGFR2b ligands (Fgf1, Fgf7, Fgf22) except for Fgf3 and Fgf20. Fgf10 expression was mesenchymal whereas FGFR1 and FGFR2 expression were mostly epithelial. Studying double transgenic mice that allow inducible overexpression of Fgf10 in adult mice, we showed that Fgf10 overexpression in normal adult glandular stomach increased epithelial proliferation, drove mucous neck cell differentiation, and reduced parietal and chief cell differentiation. Although a similar phenotype can be associated with the development of metaplasia, we found that Fgf10 overexpression for a short duration does not cause metaplasia. Finally, investigating double transgenic mice that allow the expression of a soluble form of Fgfr2b, FGF10's main receptor, which acts as a dominant negative, we found no significant changes in gastric epithelial proliferation or differentiation in the mutants. Our work provides evidence, for the first time, that the FGF10-FGFR2b signaling pathway is not required for epithelial proliferation and differentiation during adult glandular stomach homeostasis. PMID:23133671

  8. Fibroblast growth factor 10-fibroblast growth factor receptor 2b mediated signaling is not required for adult glandular stomach homeostasis.

    Directory of Open Access Journals (Sweden)

    Allison L Speer

    Full Text Available The signaling pathways that are essential for gastric organogenesis have been studied in some detail; however, those that regulate the maintenance of the gastric epithelium during adult homeostasis remain unclear. In this study, we investigated the role of Fibroblast growth factor 10 (FGF10 and its main receptor, Fibroblast growth factor receptor 2b (FGFR2b, in adult glandular stomach homeostasis. We first showed that mouse adult glandular stomach expressed Fgf10, its receptors, Fgfr1b and Fgfr2b, and most of the other FGFR2b ligands (Fgf1, Fgf7, Fgf22 except for Fgf3 and Fgf20. Fgf10 expression was mesenchymal whereas FGFR1 and FGFR2 expression were mostly epithelial. Studying double transgenic mice that allow inducible overexpression of Fgf10 in adult mice, we showed that Fgf10 overexpression in normal adult glandular stomach increased epithelial proliferation, drove mucous neck cell differentiation, and reduced parietal and chief cell differentiation. Although a similar phenotype can be associated with the development of metaplasia, we found that Fgf10 overexpression for a short duration does not cause metaplasia. Finally, investigating double transgenic mice that allow the expression of a soluble form of Fgfr2b, FGF10's main receptor, which acts as a dominant negative, we found no significant changes in gastric epithelial proliferation or differentiation in the mutants. Our work provides evidence, for the first time, that the FGF10-FGFR2b signaling pathway is not required for epithelial proliferation and differentiation during adult glandular stomach homeostasis.

  9. Homologous radioimmunoassay for human epidermal growth factor (urogastrone)

    Energy Technology Data Exchange (ETDEWEB)

    Dailey, G.E.; Kraus, J.W.; Orth, D.N.

    1978-06-01

    Epidermal growth factor (EGF), a polypeptide hormone originally discovered in the mouse submaxillary gland, stimulates growth in a variety of tissues in several species. This hormone has recently been identified in human urine. A homologous RIA for human EGF (RIA-hEGF) has been developed. In general, levels were similar to those recently reported using a heterologous RIA system. Twenty-four-hour urinary excretion of RIA-hEGF by normal adult males and females was 63.0 +- 3.0 and 52.0 +- 3.5 (mean +- SE) ..mu..g/total vol, or 29.7 +- 1.1 and 39.8 +- 1.7 ..mu..g/g creatinine, respectively. Excretion by females taking oral contraceptives was significantly greater (60.1 +- 2.7 ..mu..g/g creatinine; P < 0.01) than that by females who were not. Recent evidence suggests the probable identity of hEGF and ..beta..-urogastrone, a potent inhibitor of gastric acid secretion. Adult males with active peptic ulcer disease appeared to have lower urinary RIA-hEGF excretion (22.9 +- 2.6 ..mu..g/g creatinine) than normal men, but this was not significant (P > 0.05). Several of those with very low values had histories of alcohol abuse. Excretion by patients with Cushing's syndrome was normal. Patients with psoriasis or recovering from major burns excreted both abnormally high and abnormally low levels of RIA-hEGF, with no obvious correlation to their clinical condition. There was no apparent diurnal or postprandial variation in urinary RIA-hEGF excretion by normal subjects. An excellent linear correlation was observed between RIA-hEGF and creatinine concentrations in each urine sample for each subject, suggesting that RIA-hEGF concentration in a random urine sample provides a valid index of 24-h RIA-hEGF excretion.

  10. Significance of vascular endothelial growth factor expression in skin melanoma

    Directory of Open Access Journals (Sweden)

    Gajanin Vesna

    2010-01-01

    Full Text Available Background/Aim. Melanoma is a heterogeneous disease of skin and mucous membranes which shows significant increase in incidence worldwide in the past decades. In the process of forming new blood vessels stimulators of angiogenesis participate. There is an increase production of vascular endothelial growth factor (VEGF-C and VEGF-D, which expression cause change of endothelial cells, and higher degree of tumor's aggressiveness. The aim of this research was to determine the level of VEGF expression in skin melanoma in different body regions and in different primary stages of the disease. Methods. The research was conducted on bioptic materials of skin in 39 patients. On excision-made materials a routine histological preparation was done and following parameters were determined: histological type, alteration thickness (according to Breslow, Clark level, TNM (Tumor Nodus Metastasis stage (pT, alteration width, thickness of lymphocytic infiltration in the tumor, mitotic index, phase of the tumor growth, presence of ulcerations, cellular type of the tumor, localization and level of VEGF expression. Results. Analysis confirmed that 61.54% of skin melanoma showed a high VEGF expression. Nodular and acral lentiginous melanomas showed more frequently a high level of VEGF expression, while superficial spreading melanoma showed a lower level of VEGF expression (p = 0.032, p < 0.05. A higher level of expression was present in thicker melanomas (higher in the Breslow stage; p = 0.011, p < 0.05. The width of the lesion did not have an influence on the level of VEGF expression in melanoma (U =142.000, p = 0.273. Conclusion. Melanomas show a higher level of VEGF expression. Nodular and acral lentiginous types of melanoma show a high level of VEGF expression, while superficial spreading melanoma shows a lower level of VEGF expression. Melanomas in higher-stage disease (Breslow, Clark, pTNM show a higher level of VEGF expression.

  11. Effects of insulin-like growth factor I or human growth hormone in fasted rats.

    Science.gov (United States)

    Asakawa, K; Hizuka, N; Takano, K; Horikawa, R; Sukegawa, I; Demura, H; Shizume, K

    1992-03-01

    To study the effect of insulin-like growth factor I (IGF-I) treatment on growth and metabolism in fasted rats and compare it with the effect of human growth hormone (hGH), we infused 120 micrograms/ml IGF-I continuously or injected 200 micrograms hGH twice a day in fasted rats. After a 3 1/2-day administration of IGF-I in fasted rats, the body weights, kidney, spleen and adrenal gland weights were greater than those for untreated fasted rats (control). The body weights and the organ weights in hGH treated rats did not differ from those in control rats. Serum IGF-I levels in control, hGH treated and IGF-I treated rats were 64.0 +/- 6.1, 107.5 +/- 6.9 and 129.8 +/- 6.3 ng/ml, respectively, which were significantly different from each other. Blood urea nitrogen (BUN) levels were 13.9 +/- 1.1 ng/ml in IGF-I treated rats, which were significantly lower than those of control rats. Human GH treatment did not change BUN but affected nonesterified fatty acid (NEFA) and triglyceride. In IGF-I treated rats three-day urinary excretion of nitrogen and creatine were 163.5 +/- 14.6 mg and 9.53 +/- 1.53 mg, which were significantly less than those in control rats. These data indicate that IGF-I infusion inhibits body weight loss and catabolism in fasted rats and might be a useful therapy in catabolic conditions.

  12. Growth hormone, insulin-like growth factor-1 and the aging brain.

    Science.gov (United States)

    Ashpole, Nicole M; Sanders, Jessica E; Hodges, Erik L; Yan, Han; Sonntag, William E

    2015-08-01

    Growth hormone (GH) and insulin-like growth factor (IGF)-1 regulate the development and function of cells throughout the body. Several clinical diseases that result in a decline in physical and mental functions are marked by mutations that disrupt GH or IGF-1 signaling. During the lifespan there is a robust decrease in both GH and IGF-1. Because GH and IGF-1 are master regulators of cellular function, impaired GH and IGF-1 signaling in aging/disease states leads to significant alterations in tissue structure and function, especially within the brain. This review is intended to highlight the effects of the GH and IGF-1 on neuronal structure, function, and plasticity. Furthermore, we address several potential mechanisms through which the age-related reductions in GH and IGF-1 affect cognition. Together, the studies reviewed here highlight the importance of maintaining GH and IGF-1 signaling in order to sustain proper brain function throughout the lifespan. Copyright © 2014 Elsevier Inc. All rights reserved.

  13. Some factors that will affect the next generation of forest growth models

    International Nuclear Information System (INIS)

    Leary, R.A.

    1988-01-01

    This paper discusses several types of factors that affect the form and referents of future growth models. These include philosophical, scientific, technological, educational, and organizational factors. Each factor is presented individually

  14. The pubertal spurt: effects of sex steroids on growth hormone and insulin-like growth factor I.

    Science.gov (United States)

    Caufriez, A

    1997-02-01

    In puberty, the growth spurt and the appearance of secondary sex characteristics occur concomitantly with an increase of sex steroids, growth hormone (GH) and insulin-like growth factor I (IGF-I). A number of experiments indicate that sex steroids exert a stimulatory action on the somatotropic axis. This effect is due to an amplifying action of oestradiol (secreted by the ovaries or after testosterone aromatization) on the neuroendocrine regulation of pulsatile GH release.

  15. Prediction of the outcome of growth hormone provocative testing in short children by measurement of serum levels of insulin-like growth factor I and insulin-like growth factor binding protein 3

    DEFF Research Database (Denmark)

    Juul, A; Skakkebaek, N E

    1997-01-01

    Serum levels of insulin-like growth factor I (IGF-I) and insulin-like growth factor binding protein 3 (IGFBP-3) reflect the secretion of endogenous growth hormone (GH) in healthy children and exhibit little diurnal variation, which makes them potential candidates for screening of GH deficiency (G...

  16. The role of fibroblast growth factor 21 in atherosclerosis.

    Science.gov (United States)

    Kokkinos, John; Tang, Shudi; Rye, Kerry-Anne; Ong, Kwok Leung

    2017-02-01

    The metabolic properties of the endocrine fibroblast growth factor 21 (FGF21) have been extensively studied in the past decade. Previous studies have demonstrated the lipid-lowering, anti-inflammatory and anti-oxidant properties of FGF21. FGF21 is mainly secreted in the liver and adipose tissue in response to a range of physiological and pathological stimuli. In animal and in vitro studies, FGF21 has been shown to improve lipid profiles and inhibit key processes in the pathogenesis of atherosclerosis. It exerts its effects on the cardiovascular system via adiponectin dependent and independent mechanisms. However, the signalling pathways by which FGF21 exerts its effects on endothelial cells remains unknown and needs to be further investigated. The elevation of circulating FGF21 levels in cardiovascular disease has also raised questions as to whether FGF21 can be used as a biomarker to predict subclinical atherosclerosis and cardiovascular events. Recent findings from population studies must be validated in independent cohorts before FGF21 can be used as a biomarker in the clinical setting. The anti-atherosclerotic effects of FGF21 have been investigated in two recent clinical trials, where treatment with an FGF21 analog significantly improved the cardiometabolic profile in obese patients with type 2 diabetes. This review will evaluate recent advances that suggest there may be a role for FGF21 in atherosclerosis. Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.

  17. The Neuroprotective Functions of Transforming Growth Factor Beta Proteins

    Directory of Open Access Journals (Sweden)

    Gábor Lovas

    2012-07-01

    Full Text Available Transforming growth factor beta (TGF-β proteins are multifunctional cytokines whose neural functions are increasingly recognized. The machinery of TGF-β signaling, including the serine kinase type transmembrane receptors, is present in the central nervous system. However, the 3 mammalian TGF-β subtypes have distinct distributions in the brain suggesting different neural functions. Evidence of their involvement in the development and plasticity of the nervous system as well as their functions in peripheral organs suggested that they also exhibit neuroprotective functions. Indeed, TGF-β expression is induced following a variety of types of brain tissue injury. The neuroprotective function of TGF-βs is most established following brain ischemia. Damage in experimental animal models of global and focal ischemia was shown to be attenuated by TGF-βs. In addition, support for their neuroprotective actions following trauma, sclerosis multiplex, neurodegenerative diseases, infections, and brain tumors is also accumulating. The review will also describe the potential mechanisms of neuroprotection exerted by TGF-βs including anti-inflammatory, -apoptotic, -excitotoxic actions as well as the promotion of scar formation, angiogenesis, and neuroregeneration. The participation of these mechanisms in the neuroprotective effects of TGF-βs during different brain lesions will also be discussed.

  18. Fibroblast growth factors as tissue repair and regeneration therapeutics

    Directory of Open Access Journals (Sweden)

    Quentin M. Nunes

    2016-01-01

    Full Text Available Cell communication is central to the integration of cell function required for the development and homeostasis of multicellular animals. Proteins are an important currency of cell communication, acting locally (auto-, juxta-, or paracrine or systemically (endocrine. The fibroblast growth factor (FGF family contributes to the regulation of virtually all aspects of development and organogenesis, and after birth to tissue maintenance, as well as particular aspects of organism physiology. In the West, oncology has been the focus of translation of FGF research, whereas in China and to an extent Japan a major focus has been to use FGFs in repair and regeneration settings. These differences have their roots in research history and aims. The Chinese drive into biotechnology and the delivery of engineered clinical grade FGFs by a major Chinese research group were important enablers in this respect. The Chinese language clinical literature is not widely accessible. To put this into context, we provide the essential molecular and functional background to the FGF communication system covering FGF ligands, the heparan sulfate and Klotho co-receptors and FGF receptor (FGFR tyrosine kinases. We then summarise a selection of clinical reports that demonstrate the efficacy of engineered recombinant FGF ligands in treating a wide range of conditions that require tissue repair/regeneration. Alongside, the functional reasons why application of exogenous FGF ligands does not lead to cancers are described. Together, this highlights that the FGF ligands represent a major opportunity for clinical translation that has been largely overlooked in the West.

  19. Fascia implantation with fibroblast growth factor on vocal fold paralysis.

    Science.gov (United States)

    Nagai, Hiromi; Nishiyama, Koichiro; Seino, Yutomo; Kimura, Yu; Tabata, Yasuhiko; Okamoto, Makito

    2013-01-01

    The purpose of this prospective study was to determine the effect of autologous transplantation of fascia into the vocal fold (ATFV) with controlled release of basic fibroblast growth factor (bFGF) on unilateral vocal fold paralysis (UVFP) in a rat model. Unilateral recurrent laryngeal nerve (RLN) section was performed on 15 rats. Ten rats received an autologous fascia implant and gelatin hydrogel with or without bFGF (1 μg) to their larynxes (fascia only, "fascia group"; bFGF + fascia, "fascia + bFGF group"), while the rest underwent RLN transection ("RLN section group"). Four months later, evaluation of the laryngeal glottal gap and histological analysis were performed. The glottal gap was significantly reduced in the fascia + bFGF group, and fat volume increased significantly relative to the RLN section. The volume of the remaining fascia in the bFGF + fascia group was significantly greater than that of the fascia group. ATFV with controlled release of bFGF may compensate for diminished laryngeal volume in UVFP by reducing resorption of the implanted fascia and increasing fat volume. Our findings suggest that this modality may represent an attractive option for treating UVFP. Copyright © 2013 Elsevier Inc. All rights reserved.

  20. DLG1/SAP97 modulates transforming growth factor alpha bioavailability.

    Science.gov (United States)

    Surena, Anne-Laure; de Faria, Giselle P; Studler, Jeanne-Marie; Peiretti, Franck; Pidoux, Morgane; Camonis, Jacques; Chneiweiss, Hervé; Formstecher, Etienne; Junier, Marie-Pierre

    2009-02-01

    TGFalpha and its receptor EGFR participate in the development of a wide range of tumors including gliomas, the main adult primary brain tumors. TGFalpha soluble form results from the cleavage by the metalloprotease TACE/ADAM17 of the extracellular part of its transmembrane precursor, pro-TGFalpha. To gain insights into the mechanisms underlying TGFalpha bioavailability, a yeast two-hybrid screen was performed to identify proteins interacting with pro-TGFalpha intracellular domain (ICD). DLG1/SAP97 (Discs Large Gene 1 or Synapse Associated Protein 97) was found to interact with both pro-TGFalpha and TACE ICDs through distinct PDZ domains. An in vivo pro-TGFalpha-DLG1-TACE complex was detected in U251 glioma cells and in gliomas-derived tumor initiating cells. Interaction between DLG1 and TACE diminished in response to stimulations promoting pro-TGFalpha shedding. Manipulation of DLG1 levels revealed dual actions of DLG1 on pro-TGFalpha shedding, favoring approximation of pro-TGFalpha and TACE, while limiting TACE full shedding activity. These results show that DLG1 participates in the control of TGFalpha bioavailability through its dynamic interaction with the growth factor precursor and TACE.

  1. Intranasal epidermal growth factor treatment rescues neonatal brain injury

    Science.gov (United States)

    Scafidi, Joseph; Hammond, Timothy R.; Scafidi, Susanna; Ritter, Jonathan; Jablonska, Beata; Roncal, Maria; Szigeti-Buck, Klara; Coman, Daniel; Huang, Yuegao; McCarter, Robert J.; Hyder, Fahmeed; Horvath, Tamas L.; Gallo, Vittorio

    2014-02-01

    There are no clinically relevant treatments available that improve function in the growing population of very preterm infants (less than 32 weeks' gestation) with neonatal brain injury. Diffuse white matter injury (DWMI) is a common finding in these children and results in chronic neurodevelopmental impairments. As shown recently, failure in oligodendrocyte progenitor cell maturation contributes to DWMI. We demonstrated previously that the epidermal growth factor receptor (EGFR) has an important role in oligodendrocyte development. Here we examine whether enhanced EGFR signalling stimulates the endogenous response of EGFR-expressing progenitor cells during a critical period after brain injury, and promotes cellular and behavioural recovery in the developing brain. Using an established mouse model of very preterm brain injury, we demonstrate that selective overexpression of human EGFR in oligodendrocyte lineage cells or the administration of intranasal heparin-binding EGF immediately after injury decreases oligodendroglia death, enhances generation of new oligodendrocytes from progenitor cells and promotes functional recovery. Furthermore, these interventions diminish ultrastructural abnormalities and alleviate behavioural deficits on white-matter-specific paradigms. Inhibition of EGFR signalling with a molecularly targeted agent used for cancer therapy demonstrates that EGFR activation is an important contributor to oligodendrocyte regeneration and functional recovery after DWMI. Thus, our study provides direct evidence that targeting EGFR in oligodendrocyte progenitor cells at a specific time after injury is clinically feasible and potentially applicable to the treatment of premature children with white matter injury.

  2. Fibroblast Growth Factor 21 Mediates Glycemic Regulation by Hepatic JNK

    Directory of Open Access Journals (Sweden)

    Santiago Vernia

    2016-03-01

    Full Text Available The cJun NH2-terminal kinase (JNK-signaling pathway is implicated in metabolic syndrome, including dysregulated blood glucose concentration and insulin resistance. Fibroblast growth factor 21 (FGF21 is a target of the hepatic JNK-signaling pathway and may contribute to the regulation of glycemia. To test the role of FGF21, we established mice with selective ablation of the Fgf21 gene in hepatocytes. FGF21 deficiency in the liver caused marked loss of FGF21 protein circulating in the blood. Moreover, the protective effects of hepatic JNK deficiency to suppress metabolic syndrome in high-fat diet-fed mice were not observed in mice with hepatocyte-specific FGF21 deficiency, including reduced blood glucose concentration and reduced intolerance to glucose and insulin. Furthermore, we show that JNK contributes to the regulation of hepatic FGF21 expression during fasting/feeding cycles. These data demonstrate that the hepatokine FGF21 is a key mediator of JNK-regulated metabolic syndrome.

  3. Infiltration of Autologous Growth Factors in Chronic Tendinopathies

    Directory of Open Access Journals (Sweden)

    Antonio Crescibene

    2015-01-01

    Full Text Available Achilles tendinopathy and patellar tendinopathy are among the most frequent diagnoses in sports medicine. Therapeutic treatment of the disease is difficult, particularly in chronic cases. In literature, several studies suggest the employment of Platelet-Rich Plasma as a therapeutic alternative in tendinopathies. The choice of employing this method is based on the activity of growth factors contained in platelets which activate, amplify, and optimize the healing process. We selected 14 patients affected by Achilles tendinopathy and 7 patients affected by patellar tendinopathy, with a two-year final follow-up. These patients underwent a cycle of three tendinous infiltrations, after clinical and instrumental evaluation carried out by means of specific questionnaires and repeated ultrasound scans. Ultrasound scans of 18 patients showed signs of reduction in insertional irregularities. The result is confirmed by complete functional recovery of the patients, with painful symptomatology disappearing. The patients showed a clear pain reduction, along with an enhanced VISA score after the 24-month follow-up, equal to 84.2 points on a scale of 0 to 100. In conclusion, the present study provides evidence to suggest that PRP infiltration is a valid option to patients with chronic tendinopathy who did not benefit from other treatments.

  4. Argos inhibits epidermal growth factor receptor signalling by ligand sequestration.

    Science.gov (United States)

    Klein, Daryl E; Nappi, Valerie M; Reeves, Gregory T; Shvartsman, Stanislav Y; Lemmon, Mark A

    2004-08-26

    The epidermal growth factor receptor (EGFR) has critical functions in development and in many human cancers. During development, the spatial extent of EGFR signalling is regulated by feedback loops comprising both well-understood activators and less well-characterized inhibitors. In Drosophila melanogaster the secreted protein Argos functions as the only known extracellular inhibitor of EGFR, with clearly identified roles in multiple stages of development. Argos is only expressed when the Drosophila EGFR (DER) is activated at high levels, and downregulates further DER signalling. Although there is ample genetic evidence that Argos inhibits DER activation, the biochemical mechanism has not been established. Here we show that Argos inhibits DER signalling without interacting directly with the receptor, but instead by sequestering the DER-activating ligand Spitz. Argos binds tightly to the EGF motif of Spitz and forms a 1:1 (Spitz:Argos) complex that does not bind DER in vitro or at the cell surface. Our results provide an insight into the mechanism of Argos function, and suggest new strategies for EGFR inhibitor design.

  5. Signal transduction by the platelet-derived growth factor receptor

    International Nuclear Information System (INIS)

    Williams, L.T.; Escobedo, J.A.; Keating, M.T.; Coughlin, S.R.

    1988-01-01

    The mitogenic effects of platelet-derived growth factor (PDGF) are mediated by the PDGF receptor. The mouse PDGF receptor was recently purified on the basis of its ability to become tyrosine phosphorylated in response to the A-B human platelet form of PDGF, and the receptor amino acid sequence was determined from a full-length cDNA clone. Both the human and mouse receptor cDNA sequences have been expressed in Chinese hamster ovary fibroblast (CHO) cells that normally lack PDGF receptors. This paper summarizes recent results using this system to study signal transduction by the PDGF receptor. Some of the findings show that the KI domain of the PDGF receptor plays an important role in the stimulation of DNA synthesis by PDGF. Surprisingly, the kinase insert region is not essential for PDGF stimulation of PtdIns turnover, pH change, increase in cellular calcium, and receptor autophosphorylation. In addition, PDGF stimulates a conformational change in the receptor

  6. Nerve growth factor facilitates perivascular innervation in neovasculatures of mice

    Directory of Open Access Journals (Sweden)

    Mitsuhiro Goda

    2016-08-01

    Full Text Available It is well known that blood vessels including arterioles have a perivascular innervation. It is also widely accepted that perivascular nerves maintain vascular tone and regulate blood flow. Although there are currently prevailing opinions, unified views on the innervation of microcirculation in any organs have not been established. The present study was designed to investigate whether there are perivascular nerves innervated in microvessels and neovessels. Furthermore, we examined whether nerve growth factor (NGF can exert a promotional effect on perivascular nerve innervation in neovessels of Matrigel plugs. A Matrigel was subcutaneously implanted in mouse. The presence of perivascular nerves in Matrigel on Day 7–21 after the implantation was immunohistochemically studied. NGF or saline was subcutaneously administered by an osmotic mini-pump for a period of 3–14 days. The immunostaining of neovasculatures in Matrigel showed the presence of perivascular nerves on Day 21 after Matrigel injection. Perivascular nerve innervation of neovessels within Matrigel implanted in NGF-treated mice was observed in Day 17 after Matrigel implantation. However, NGF treatment did not increase numbers of neovessels in Matrigel. These results suggest that perivascular nerves innervate neovessels as neovasculatures mature and that NGF accelerates the innervation of perivascular nerves in neovessels.

  7. Vascular Endothelial Growth Factor from Embryonic Status to Cardiovascular Pathology

    Directory of Open Access Journals (Sweden)

    Mohsen Azimi-Nezhad

    2014-05-01

    Full Text Available Vascular endothelial growth factor (VEGF is a multifunctional cytokine with distinct functions in angiogenesis, lymphangiogenesis, vascular permeability, and hematopoiesis. VEGF is a highly conserved, disulfide-bonded dimeric glycoprotein of 34 to 45 kDa produced by several cell types including fibroblasts, neutrophils, endothelial cells, and peripheral blood mononuclear cells, particularly T lymphocytes and macrophages. Six VEGF isoforms are generated as a result of alternative splicing from a single VEGF gene, consisting of 121, 145, 165, 183, 189, or 206 amino acids. VEGF121, VEGF145, and VEGF165 are secreted whereas VEGF183, VEGF189, and VEGF206 are cell membrane-bound. VEGF145 has a key role during the vascularization of the human ovarian follicle and corpus luteum, in the placentation and embryonic periods, and in bone and wound healing, while VEGF165 is the most abundant and biologically active isoform. VEGF has been linked with a number of vascular pathologies including cardiovascular diseases such ischemic heart disease, heart failure, stroke, and diabetes and its related complications. In this review we aimed to present some important roles of VEGF in a number of clinical issues and indicate its involvement in several phenomena from the initial steps of the embryonic period to cardiovascular diseases.

  8. Nerve growth factor helps protect retina in experimental retinal detachment.

    Science.gov (United States)

    Sun, Xiaodong; Xu, Xun; Wang, Fenghua; Zhang, Xi; Ho, Patrick C P; Liu, Haiyang; Qian, Jin; Yu, Zhang; Lu, Hongfen; Xu, Weiqi

    2008-01-01

    To investigate the expression of nerve growth factor (NGF) and its receptor TrkA on the retina at different time points after retinal detachment (RD) and the protection effect of NGF in experimental RD. Sprague-Dawley rats were used as an RD animal model by injection of 0.1% sodium hyaluronate under the neurosensory retina. The expression of endogenous NGF and its receptor TrkA in the rat retina was detected using immunohistochemistry. The NGF (5 mug/eye) or phosphate-buffered saline were injected separately into vitreous every 4 days after the RD. The rat eyes were then observed at various time points. Morphologic changes were investigated by light microscopy. Retinal gliosis was detected by glial fibrillary acidic protein labeling. The expression of endogenous NGF and TrkA was upregulated during RD procedure. Most of the NGF-treated retina had a well-organized structure. In NGF-treated RD eyes, the cells were still significantly more numerous than in phosphate-buffered-saline-treated retina. Glial fibrillary acidic protein labeling increased quickly after RD; the NGF-treated retina had less reactive gliosis than the control groups. Intravitreal injection of exogenous NGF can protect retinal cells from degeneration in experimental RD. It may exert its protective action by preventing the apoptosis of retinal cells after RD. (c) 2007 S. Karger AG, Basel.

  9. The Neuroprotective Functions of Transforming Growth Factor Beta Proteins

    Science.gov (United States)

    Dobolyi, Arpád; Vincze, Csilla; Pál, Gabriella; Lovas, Gábor

    2012-01-01

    Transforming growth factor beta (TGF-β) proteins are multifunctional cytokines whose neural functions are increasingly recognized. The machinery of TGF-β signaling, including the serine kinase type transmembrane receptors, is present in the central nervous system. However, the 3 mammalian TGF-β subtypes have distinct distributions in the brain suggesting different neural functions. Evidence of their involvement in the development and plasticity of the nervous system as well as their functions in peripheral organs suggested that they also exhibit neuroprotective functions. Indeed, TGF-β expression is induced following a variety of types of brain tissue injury. The neuroprotective function of TGF-βs is most established following brain ischemia. Damage in experimental animal models of global and focal ischemia was shown to be attenuated by TGF-βs. In addition, support for their neuroprotective actions following trauma, sclerosis multiplex, neurodegenerative diseases, infections, and brain tumors is also accumulating. The review will also describe the potential mechanisms of neuroprotection exerted by TGF-βs including anti-inflammatory, -apoptotic, -excitotoxic actions as well as the promotion of scar formation, angiogenesis, and neuroregeneration. The participation of these mechanisms in the neuroprotective effects of TGF-βs during different brain lesions will also be discussed. PMID:22942700

  10. Topical administration of adrenergic receptor pharmaceutics and nerve growth factor

    Directory of Open Access Journals (Sweden)

    Jena J Steinle

    2010-06-01

    Full Text Available Jena J SteinleDepartments of Ophthalmology and Anatomy and Neurobiology, Hamilton Eye Institute, University of Tennessee Health Science Center, Memphis, TN 38163, USAAbstract: Topical application of nerve growth factor (NGF and adrenergic receptor pharmaceutics are currently in use for corneal ulcers and glaucoma. A recent interest in the neuroprotective abilities of NGF has led to a renewed interest in NGF as a therapeutic for retinal and choroidal diseases. NGF can promote cell proliferation through actions of the TrkA receptor or promote apoptosis through receptor p75NTR. This understanding has led to novel interest in the role of NGF for diseases of the posterior eye. The role of β-adrenergic receptor agonists and antagonists for treatments of glaucoma, diabetic retinopathy, and their potential mechanisms of action, are still under investigation. This review discusses the current knowledge and applications of topical NGF and adrenergic receptor drugs for ocular disease.Keywords: NGF, β-adrenergic receptor agents, α-adrenergic receptor agents, retina, cornea, glaucoma

  11. Functional Diversity of Fibroblast Growth Factors in Bone Formation

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    Yuichiro Takei

    2015-01-01

    Full Text Available The functional significance of fibroblast growth factor (FGF signaling in bone formation has been demonstrated through genetic loss-of-function and gain-of-function approaches. FGFs, comprising 22 family members, are classified into three subfamilies: canonical, hormone-like, and intracellular. The former two subfamilies activate their signaling pathways through FGF receptors (FGFRs. Currently, intracellular FGFs appear to be primarily involved in the nervous system. Canonical FGFs such as FGF2 play significant roles in bone formation, and precise spatiotemporal control of FGFs and FGFRs at the transcriptional and posttranscriptional levels may allow for the functional diversity of FGFs during bone formation. Recently, several research groups, including ours, have shown that FGF23, a member of the hormone-like FGF subfamily, is primarily expressed in osteocytes/osteoblasts. This polypeptide decreases serum phosphate levels by inhibiting renal phosphate reabsorption and vitamin D3 activation, resulting in mineralization defects in the bone. Thus, FGFs are involved in the positive and negative regulation of bone formation. In this review, we focus on the reciprocal roles of FGFs in bone formation in relation to their local versus systemic effects.

  12. Human corpus luteum: presence of epidermal growth factor receptors and binding characteristics

    International Nuclear Information System (INIS)

    Ayyagari, R.R.; Khan-Dawood, F.S.

    1987-01-01

    Epidermal growth factor receptors are present in many reproductive tissues but have not been demonstrated in the human corpus luteum. To determine the presence of epidermal growth factor receptors and its binding characteristics, we carried out studies on the plasma cell membrane fraction of seven human corpora lutea (days 16 to 25) of the menstrual cycle. Specific epidermal growth factor receptors were present in human corpus luteum. Insulin, nerve growth factor, and human chorionic gonadotropin did not competitively displace epidermal growth factor binding. The optimal conditions for corpus luteum-epidermal growth factor receptor binding were found to be incubation for 2 hours at 4 degrees C with 500 micrograms plasma membrane protein and 140 femtomol 125 I-epidermal growth factor per incubate. The number (mean +/- SEM) of epidermal growth factor binding sites was 12.34 +/- 2.99 X 10(-19) mol/micrograms protein; the dissociation constant was 2.26 +/- 0.56 X 10(-9) mol/L; the association constant was 0.59 +/- 0.12 X 10(9) L/mol. In two regressing corpora lutea obtained on days 2 and 3 of the menstrual cycle, there was no detectable specific epidermal growth factor receptor binding activity. Similarly no epidermal growth factor receptor binding activity could be detected in ovarian stromal tissue. Our findings demonstrate that specific receptors for epidermal growth factor are present in the human corpus luteum. The physiologic significance of epidermal growth factor receptors in human corpus luteum is unknown, but epidermal growth factor may be involved in intragonadal regulation of luteal function

  13. Hepatoma-derived growth factor-related protein-3 is a novel angiogenic factor.

    Directory of Open Access Journals (Sweden)

    Michelle E LeBlanc

    Full Text Available Hepatoma-derived growth factor-related protein-3 (Hdgfrp3 or HRP-3 was recently reported as a neurotrophic factor and is upregulated in hepatocellular carcinoma to promote cancer cell survival. Here we identified HRP-3 as a new endothelial ligand and characterized its in vitro and in vivo functional roles and molecular signaling. We combined open reading frame phage display with multi-round in vivo binding selection to enrich retinal endothelial ligands, which were systematically identified by next generation DNA sequencing. One of the identified endothelial ligands was HRP-3. HRP-3 expression in the retina and brain was characterized by Western blot and immunohistochemistry. Cell proliferation assay showed that HRP-3 stimulated the growth of human umbilical vein endothelial cells (HUVECs. HRP-3 induced tube formation of HUVECs in culture. Wound healing assay indicated that HRP-3 promoted endothelial cell migration. HRP-3 was further confirmed for its in vitro angiogenic activity by spheroid sprouting assay. HRP-3 extrinsically activated the extracellular-signal-regulated kinase ½ (ERK1/2 pathway in endothelial cells. The angiogenic activity of HRP-3 was independently verified by mouse cornea pocket assay. Furthermore, in vivo Matrigel plug assay corroborated HRP-3 activity to promote new blood vessel formation. These results demonstrated that HRP-3 is a novel angiogenic factor.

  14. Fibroblast Growth Factor-23 in Bed Rest and Spaceflight

    Science.gov (United States)

    Bokhari, R.; Zwart, S. R; Fields, E.; Heer, M.; Sibonga, J.; Smith, S. M.

    2014-01-01

    Many nutritional factors influence bone, from the basics of calcium and vitamin D, to factors which influence bone through acid/base balance, including protein, sodium, and more. Fibroblast growth factor 23 (FGF23) is a recently identified factor, secreted from osteocytes, which is involved in classic (albeit complex) feedback loops controlling phosphorus homeostasis through both vitamin D and parathyroid hormone (PTH) (1, 2). As osteocytes are gravity sensing cells, it is important to determine if there are changes in FGF23 during spaceflight. In extreme cases, such as chronic kidney disease, FGF23 levels are highly elevated. FGF23 imbalances, secondary to dietary influences, may contribute to skeletal demineralization and kidney stone risk during spaceflight. Presented with an imbalanced dietary phosphorus to calcium ratio, increased secretion of FGF23 will inhibit renal phosphorus reabsorption, resulting in increased excretion and reduced circulating phosphorus. Increased intake and excretion of phosphorus is associated with increased kidney stone risk in both the terrestrial and microgravity environments. Highly processed foods and carbonated beverages are associated with higher phosphorus content. Ideally, the dietary calcium to phosphorus ratio should be at minimum 1:1. Nutritional requirements for spaceflight suggest that this ratio not be less than 0.67 (3), while the International Space Station (ISS) menu provides 1020 mg Ca and 1856 mg P, for a ratio of 0.55 (3). Subjects in NASA's bed rest studies, by design, have consumed intake ratios much closer to 1.0 (4). FGF23 also has an inhibitory influence on PTH secretion and 1(alpha)-hydroxylase, both of which are required for activating vitamin D with the conversion of 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D. Decreased 1,25-dihydroxyvitamin D will result in decreased intestinal phosphorus absorption, and increased urinary phosphorus excretion (via decreased renal reabsorption). Should a decrease in 1

  15. A comparison of the effect of epidermal growth factor, platelet-derived growth factor, and fibroblast growth factor on rat periodontal ligament fibroblast-like cells' DNA synthesis and morphology

    DEFF Research Database (Denmark)

    Blom, S; Holmstrup, P; Dabelsteen, Erik

    1994-01-01

    of observations were assessed by the Student t-test. The morphogenic effects of growth factors were described with respect to growth pattern, cell orientation, and cell and nucleus form after a random photographic recording. The fibroblast-like cell type and the non-transformed phenotype of the cell line have...... nuclei. Incorporation of [3H]-thymidine was increased in a dose-dependent manner by all growth factors. Maximal effect on the DNA synthesis was: rEGF, 131%; nPDGF, 274%; and nFGF, 182%.(ABSTRACT TRUNCATED AT 250 WORDS)...

  16. Arctigenin induced gallbladder cancer senescence through modulating epidermal growth factor receptor pathway.

    Science.gov (United States)

    Zhang, Mingdi; Cai, Shizhong; Zuo, Bin; Gong, Wei; Tang, Zhaohui; Zhou, Di; Weng, Mingzhe; Qin, Yiyu; Wang, Shouhua; Liu, Jun; Ma, Fei; Quan, Zhiwei

    2017-05-01

    Gallbladder cancer has poor prognosis and limited therapeutic options. Arctigenin, a representative dibenzylbutyrolactone lignan, occurs in a variety of plants. However, the molecular mechanisms involved in the antitumor effect of arctigenin on gallbladder cancer have not been fully elucidated. The expression levels of epidermal growth factor receptor were examined in 100 matched pairs of gallbladder cancer tissues. A positive correlation between high epidermal growth factor receptor expression levels and poor prognosis was observed in gallbladder cancer tissues. Pharmacological inhibition or inhibition via RNA interference of epidermal growth factor receptor induced cellular senescence in gallbladder cancer cells. The antitumor effect of arctigenin on gallbladder cancer cells was primarily achieved by inducing cellular senescence. In gallbladder cancer cells treated with arctigenin, the expression level of epidermal growth factor receptor significantly decreased. The analysis of the activity of the kinases downstream of epidermal growth factor receptor revealed that the RAF-MEK-ERK signaling pathway was significantly inhibited. Furthermore, the cellular senescence induced by arctigenin could be reverted by pcDNA-epidermal growth factor receptor. Arctigenin also potently inhibited the growth of tumor xenografts, which was accompanied by the downregulation of epidermal growth factor receptor and induction of senescence. This study demonstrates arctigenin could induce cellular senescence in gallbladder cancer through the modulation of epidermal growth factor receptor pathway. These data identify epidermal growth factor receptor as a key regulator in arctigenin-induced gallbladder cancer senescence.

  17. Evaluation of insulin-like growth factor-1 and insulin like growth factor binding protein-3 in diagnosis of growth hormone deficiency in short-stature children

    International Nuclear Information System (INIS)

    Ali, A.; Hashim, R.; Khan, F.A.; Sattar, A.; Ijaz, A.; Manzoor, S.M.; Younas, M.

    2009-01-01

    Growth Hormone Deficiency (GHD) is conventionally diagnosed and confirmed by diminished peak Growth Hormone (GH) levels to provocative testing. Serum Insulin-like growth factor-1 (IGF-1) and insulin-like growth factor binding protein-3 (IGFBP-3) are under the influence of GH and reflect the spontaneous endogenous GH secretion. Owing to the absence of a circadian rhythm, it is possible to take individual measurements of IGF-1 and IGFBP-3 at any time of the day for evaluation of GH status instead of subjecting the individual to cumbersome provocative tests. Objectives of this study were to compare IGF-1 and IGFBP-3 assays with Exercise and L-Dopa stimulation tests in the diagnosis of growth hormone deficiency in short stature children using ITT as gold standard. Methods: This validation study was conducted at Department of Chemical Pathology and Endocrinology, AFIP, Rawalpindi, from November 2005 to October 2006. Fifty-two short stature children were included in the study. Basal samples for GH levels and simultaneous IGF-1 and IGFBP-3 measurements were obtained and afterwards all children were subjected to sequential exercise and LDopa stimulation tests. Insulin Tolerance Test (ITT) was performed one week later with all the necessary precautionary measures. On the basis of ITT results, children were divided into two groups, i.e., 31 growth hormone deficient and 21 Normal Variant Short Stature (NVSS). Results: The diagnostic value of exercise stimulation test remained highest with sensitivity 90.3%, specificity 76.0%, Positive Predictive Value (PPV) 84.84%, Negative Predictive Value (NPV) 84.2% and accuracy 84.6%. The conventional L-Dopa stimulation had sensitivity 96.7%, specificity 38.0%, PPV 69.7%, NPV 88.8 % and accuracy 73.0%. The serum IGF-1 and IGFBP-3 levels were positively correlated with post ITT peak GH levels (r= 0.527, r=0.464 respectively, both p<0.001). The diagnostic value of IGF-1 had sensitivity 83.87%, specificity 76.2%, PPV 83.87%, NPV 76.2% and

  18. Epidermal growth factor, transforming growth factor-alpha, and epidermal growth factor receptor expression and localization in the canine endometrium during the estrous cycle and in bitches with pyometra.

    Science.gov (United States)

    Kida, K; Maezono, Y; Kawate, N; Inaba, T; Hatoya, S; Tamada, H

    2010-01-01

    Gene expression and immunohistochemical localization of epidermal growth factor (EGF), transforming growth factor-alpha (TGF-alpha), and epidermal growth factor receptor (EGF-R) were compared between the endometrium of bitches (Canis familiaris) with pyometra accompanied by cystic endometrial hyperplasia (CEH) and that of healthy bitches at similar stages of the estrous cycle. In normal bitches, endometrial TGF-alpha mRNA levels were highest at proestrus and gradually decreased as the cycle progressed to anestrus. Epidermal growth factor receptor mRNA levels were not significantly affected by the stage of the estrous cycle. Epidermal growth factor mRNA levels were higher at Day 35 of diestrus than at other stages of the estrous cycle (Ppyometra, endometrial TGF-alpha and EGF-R mRNA levels did not differ significantly from those at diestrus in normal bitches, but EGF mRNA levels were lower than those at Day 35 of diestrus in normal bitches (Ppyometra, immunoreactivity for EGF was clearly present in endometrial stromal cells. Inflammatory cells that had infiltrated the endometrial stroma stained strongly for TGF-alpha and EGF-R. Luminal and glandular epithelial cells also stained positive for EGF-R. In conclusion, expression of TGF-alpha by inflammatory cells and a low level of expression and differential localization of EGF may be involved in aberrant growth of endometrial glands and development of CEH.

  19. Some growth factors stimulate cultured adult rabbit ventricular myocyte hypertrophy in the absence of mechanical loading

    Science.gov (United States)

    Decker, R. S.; Cook, M. G.; Behnke-Barclay, M.; Decker, M. L.

    1995-01-01

    Cultured adult rabbit cardiac myocytes treated with recombinant growth factors display enhanced rates of protein accumulation (ie, growth) in response to insulin and insulin-like growth factors (IGFs), but epidermal growth factor, acidic or basic fibroblast growth factor, and platelet-derived growth factor failed to increase contractile protein synthesis or growth of the heart cells. Insulin and IGF-1 increased growth rates by stimulating anabolic while simultaneously inhibiting catabolic pathways, whereas IGF-2 elevated growth modestly by apparently inhibiting lysosomal proteolysis. Neutralizing antibodies directed against either IGF-1 or IGF-2 or IGF binding protein 3 blocked protein accumulation. A monoclonal antibody directed against the IGF-1 receptor also inhibited changes in protein turnover provoked by recombinant human IGF-1 but not IGF-2. Of the other growth factors tested, only transforming growth factor-beta 1 increased the fractional rate of myosin heavy chain (MHC) synthesis, with beta-MHC synthesis being elevated and alpha-MHC synthesis being suppressed. However, the other growth factors were able to modestly stimulate the rate of DNA synthesis in this preparation. Bromodeoxyuridine labeling revealed that these growth factors increased DNA synthesis in myocytes and nonmyocytes alike, but the heart cells displayed neither karyokinesis or cytokinesis. In contrast, cocultures of cardiac myocytes and nonmyocytes and nonmyocyte-conditioned culture medium failed to enhance the rate of cardiac MHC synthesis or its accumulation, implying that quiescent heart cells do not respond to "conditioning" by cardiac nonmyocytes. These findings demonstrated that insulin and the IGFs promote passively loaded cultured adult rabbit heart cells to hypertrophy but suggest that other growth factors tested may be limited in this regard.

  20. Effect of β-nerve growth factor on differentiation of endothelial ...

    African Journals Online (AJOL)

    Enzyme-linked immunosorbent assay (ELISA) was conducted to detect the levels of vascular endothelial growth factor (VEGF), von Willebrand factor (vWF) and basic fibroblast growth factor (bFGF) in different rat EPC culture solutions. Western blot was performed to determine the expression of tyrosine kinase receptor A ...

  1. Bioinspired Heparin Nanosponge Prepared by Photo-crosslinking for Controlled Release of Growth Factors

    DEFF Research Database (Denmark)

    Choi, Won Il; Sahu, Abhishek; Vilos, Cristian

    2017-01-01

    factor binding ability. Four different growth factors, bFGF, VEGF, BMP-2, and HGF were successfully encapsulated into Hep-NS. In vitro studies showed sustained release of all the growth factors for almost 60 days and the rate of release was directly dependent on the amount of heparin in Hep...

  2. Advanced Growth Factor Delivery Systems in Wound Management and Skin Regeneration.

    Science.gov (United States)

    Park, Jin Woo; Hwang, Seung Rim; Yoon, In-Soo

    2017-07-27

    Growth factors are endogenous signaling molecules that regulate cellular responses required for wound healing processes such as migration, proliferation, and differentiation. However, exogenous application of growth factors has limited effectiveness in clinical settings due to their low in vivo stability, restricted absorption through skin around wound lesions, elimination by exudation prior to reaching the wound area, and other unwanted side effects. Sophisticated systems to control the spatio-temporal delivery of growth factors are required for the effective and safe use of growth factors as regenerative treatments in clinical practice, such as biomaterial-based drug delivery systems (DDSs). The current review describes the roles of growth factors in wound healing, their clinical applications for the treatment of chronic wounds, and advances in growth factor-loaded DDSs for enhanced wound healing, focusing on micro- and nano-particulate systems, scaffolds, hydrogels, and other miscellaneous systems.

  3. Dysregulation of neurotrophic and haematopoietic growth factors in Alzheimer's disease: from pathophysiology to novel treatment strategies.

    Science.gov (United States)

    Sopova, Kateryna; Gatsiou, Katerina; Stellos, Konstantinos; Laske, Christoph

    2014-01-01

    Alzheimer's disease (AD) is the leading cause of dementia in the elderly. Growth factors have been demonstrated to act in a synergistic way in angiogenesis and neurogenesis contributing to self-healing powers of the adult human brain. A growing body of evidence demonstrates that levels of many growth factors (neurotrophins and hematopoietins) are altered in cerebrospinal fluid and peripheral blood from AD patients and in animal models of AD. The present review summarizes the role of several neurotrophic growth factors (e.g., BDNF, SCF, NGF, GDNF) and haematopoietic growth factors (e.g., G-CSF, VEGF, SDF-1) in AD. Moreover, we summarize recent studies evaluating the diagnostic and prognostic value of growth factor levels in blood and cerebrospinal fluid in patients with AD and discuss the potential role of these growth factors as a promising new therapeutic approach in AD.

  4. Active immunization of pigs against growth hormone-releasing factor: effect on concentrations of growth hormone and insulin-like growth factor 1.

    Science.gov (United States)

    Armstrong, J D; Esbenshade, K L; Johnson, J L; Coffey, M T; Heimer, E; Campbell, R M; Mowles, T; Felix, A

    1990-02-01

    Cyclic gilts (96 +/- 1 kg) were used to determine the effect of active immunization against growth hormone-releasing factor GRF(1-29)-NH2 on concentrations of growth hormone (GH) and insulin-like growth factor 1 (IGF-1). Gilts were immunized against GRF conjugated to human serum albumin (GRF-HSA, n = 5) or HSA alone at 180 d of age (wk 0). Booster doses were administered at wk 9 and 13. Seven days after the second booster (wk 14), blood samples were collected at 15-min intervals for 6 h before feeding and 30, 60, 120, 180 and 240 min after feeding. Eight days after the second booster, all gilts were administered a GRF analog, [desNH2Tyr1,Ala15]-GRF(1-29)-NH2, followed by an opioid agonist, FK33-824. Blood samples were collected at 15-min intervals from -30 to 240 min after injection. Immunization against GRF-HSA resulted in antibody titers, expressed as dilution required to bind 50% of [125I]GRF, ranging from 1:11,000 to 1:60,000 (wk 11 and 14); binding was not detectable or was less than 50% at 1:100 in HSA gilts (P less than .05). Episodic release of GH was abolished by immunization against GRF-HSA (P less than .05). Mean GH was decreased (P less than .07), but basal GH concentrations were not altered (P greater than .15) by immunization against GRF-HSA. Serum concentrations of IGF-1 were similar at wk 0, but concentrations were lower in GRF-HSA than in HSA gilts (P less than .05) at wk 14.(ABSTRACT TRUNCATED AT 250 WORDS)

  5. Attenuation of epidermal growth factor (EGF) signaling by growth hormone (GH).

    Science.gov (United States)

    González, Lorena; Miquet, Johanna G; Irene, Pablo E; Díaz, M Eugenia; Rossi, Soledad P; Sotelo, Ana I; Frungieri, Mónica B; Hill, Cristal M; Bartke, Andrzej; Turyn, Daniel

    2017-05-01

    Transgenic mice overexpressing growth hormone (GH) show increased hepatic protein content of the epidermal growth factor receptor (EGFR), which is broadly associated with cell proliferation and oncogenesis. However, chronically elevated levels of GH result in desensitization of STAT-mediated EGF signal and similar response of ERK1/2 and AKT signaling to EGF compared to normal mice. To ascertain the mechanisms involved in GH attenuation of EGF signaling and the consequences on cell cycle promotion, phosphorylation of signaling mediators was studied at different time points after EGF stimulation, and induction of proteins involved in cell cycle progression was assessed in normal and GH-overexpressing transgenic mice. Results from kinetic studies confirmed the absence of STAT3 and 5 activation and comparable levels of ERK1/2 phosphorylation upon EGF stimulation, which was associated with diminished or similar induction of c-MYC, c-FOS, c-JUN, CYCLIN D1 and CYCLIN E in transgenic compared to normal mice. Accordingly, kinetics of EGF-induced c-SRC and EGFR phosphorylation at activating residues demonstrated that activation of these proteins was lower in the transgenic mice with respect to normal animals. In turn, EGFR phosphorylation at serine 1046/1047, which is implicated in the negative regulation of the receptor, was increased in the liver of GH-overexpressing transgenic mice both in basal conditions and upon EGF stimulus. Increased basal phosphorylation and activation of the p38-mitogen-activated protein kinase might account for increased Ser 1046/1047 EGFR. Hyperphosphorylation of EGFR at serine residues would represent a compensatory mechanism triggered by chronically elevated levels of GH to mitigate the proliferative response induced by EGF. © 2017 Society for Endocrinology.

  6. Serum Growth Hormone and Insulin-Like Growth Factor-1 Levels in Women with Postadolescent Acne

    Directory of Open Access Journals (Sweden)

    Mualla Polat

    2010-06-01

    Full Text Available Background and Design: Acne vulgaris is an inflammatory disease of pilosebaceous unit. It usually starts after puberty but may continue into adulthood. We studied Growth hormone (GH and insulin-like growth factor (IGF-1 levels in women patients with acne vulgaris in whom all other hormon levels were normal. We aimed to show any relation of the acne vulgaris lesion type and GH and IGF-1 levels. Material and Method: The study conducted on the postadolesance period woman patients applying to out patient dermatology department with complaint of acne symptoms between Semtember 2005 and July 2006. All other hormonal parameters were normal in patients. 25 healthy similar age women were accepted as control. IGF-I and GH were quantified by solid-phase competitive chemiluminescence assays. Results: There was no difference according to age between the groups (p=0.726. The mean IGF-1 level was 336.5±112.88 ng/ml in patients and 194±31.32 ng/ml in control; the difference was significantly important (p=0.000. The mean GH level was 3.16±4.35 µIU/ml in patients and 1.15±1.21 µIU/ml in control; and the diffrence was not found as important (p=0.03. IGF-1 level was significantly important in patients with noduler involvement (p=0.015, and GH level was also significantly important in patients with cystic involvement (p=0.05. Conclusion: We supported the hypothesis that GH and IGF-1 levels were important in postadolasence period women patients with acne vulgaris. We recommend new studies comparing GH and IGF-1 levels in adolesence and postadolesence period women patients in order to support the role of these hormones in pathogenesis of acne vulgaris.

  7. Effect of growth hormone-releasing factor on growth hormone release in children with radiation-induced growth hormone deficiency

    International Nuclear Information System (INIS)

    Lustig, R.H.; Schriock, E.A.; Kaplan, S.L.; Grumbach, M.M.

    1985-01-01

    Five male children who received cranial irradiation for extrahypothalamic intracranial neoplasms or leukemia and subsequently developed severe growth hormone (GH) deficiency were challenged with synthetic growth hormone-releasing factor (GRF-44), in an attempt to distinguish hypothalamic from pituitary dysfunction as a cause of their GH deficiency, and to assess the readily releasable GH reserve in the pituitary. In response to a pulse of GRF-44 (5 micrograms/kg intravenously), mean peak GH levels rose to values higher than those evoked by the pharmacologic agents L-dopa or arginine (6.4 +/- 1.3 ng/mL v 1.5 +/- 0.4 ng/mL, P less than .05). The peak GH value occurred at a mean of 26.0 minutes after administration of GRF-44. These responses were similar to those obtained in children with severe GH deficiency due to other etiologies (peak GH 6.3 +/- 1.7 ng/mL, mean 28.0 minutes). In addition, there was a trend toward an inverse relationship between peak GH response to GRF-44 and the postirradiation interval. Prolactin and somatomedin-C levels did not change significantly after the administration of a single dose of GRF-44. The results of this study support the hypothesis that cranial irradiation in children can lead to hypothalamic GRF deficiency secondary to radiation injury of hypothalamic GRF-secreting neurons. This study also lends support to the potential therapeutic usefulness of GRF-44 or an analog for GH deficiency secondary to cranial irradiation

  8. Placental Growth Factor Promotes Cardiac Muscle Repair via Enhanced Neovascularization

    Directory of Open Access Journals (Sweden)

    Jianfeng Zhang

    2015-06-01

    Full Text Available Background/Aims: Transplantation of mesenchymal stem cells (MSCs improves post-injury cardiac muscle repair using ill-defined mechanisms. Recently, we have shown that production and secretion of placental growth factor (PLGF by MSCs play a critical role in the MSCs-mediated post-injury cardiac muscle repair. In this study, we addressed the underlying molecular mechanisms, focusing specifically on the interactions between MSCs, macrophages and endothelial cells. Methods: We isolated macrophages (BM-MΦ from mouse bone-marrow derived cells based on F4/80 expression by flow cytometry. BM-MΦ were treated with different doses of PLGF. Cell number was analyzed by a MTT assay. Macrophage polarization was examined based on CD206 expression by flow cytometry. PLGF levels in macrophage subpopulations were analyzed by RT-qPCR and ELISA. Effects of macrophages on vascularization were evaluated by a collagen gel assay using Human umbilical vein endothelial cells (HUVECs co-cultured with PLGF-treated macrophages. Results: PLGF did not increase macrophage number, but dose-dependently polarized macrophages into a M2 subpopulation. M2 macrophages expressed high levels of PLGF. PLGF-polarized M2 macrophages significantly increased tubular structures in the collagen gel assay. Conclusion: Our data suggest that MSCs-derived PLGF may induce macrophage polarization into a M2 subpopulation, which in turn releases more PLGF to promote local neovascularization for augmenting post-injury cardiac muscle repair. This study thus sheds novel light on the role of PLGF in cardiac muscle regeneration.

  9. Nerve growth factor accelerates wound healing in diabetic mice.

    Science.gov (United States)

    Muangman, Pornprom; Muffley, Lara A; Anthony, Joanne P; Spenny, Michelle L; Underwood, Robert A; Olerud, John E; Gibran, Nicole S

    2004-01-01

    Patients with diabetic neuropathy have reduced numbers of cutaneous nerves, which may contribute to an increased incidence of nonhealing wounds. Nerve growth factor (NGF) has been reported to augment wound closure. We hypothesized that topical 2.5S NGF, a biologically active subunit of the NGF polymer, would accelerate wound repair, augment nerve regeneration, and increase inflammation in excisional wounds in diabetic mice. A full-thickness 6-mm punch biopsy wound was created on the dorsum of C57BL/6J-m+ Leprdb mice (db/db) and heterozygous (db/-) littermates and treated daily with normal saline or 2.5S NGF (1 microg/day or 10 microg/day) on post-injury days 0-6. Time to closure, wound epithelialization, and degree of inflammation were compared using a Student's t-test. Color subtractive-computer-assisted image analysis was used to quantify immunolocalized nerves in wounds. Non-overlapping (20x) digital images of the wound were analyzed for nerve profile counts, area density (number of protein gene product 9.5 positive profiles per unit dermal area) and area fraction (protein gene product 9.5 positive area per unit dermal area). Healing times in db/db mice decreased from 30 days in normal saline-treated mice to 26 days in mice treated with 1 microg/day NGF (pnerve number, area density, and area fraction were increased in NGF-treated wounds at 14, 21, and 35 days (pnerve regeneration. Further studies to determine the role of nerves in wound repair are warranted.

  10. Growth Differentiation Factor-15 and Risk of CKD Progression.

    Science.gov (United States)

    Nair, Viji; Robinson-Cohen, Cassianne; Smith, Michelle R; Bellovich, Keith A; Bhat, Zeenat Yousuf; Bobadilla, Maria; Brosius, Frank; de Boer, Ian H; Essioux, Laurent; Formentini, Ivan; Gadegbeku, Crystal A; Gipson, Debbie; Hawkins, Jennifer; Himmelfarb, Jonathan; Kestenbaum, Bryan; Kretzler, Matthias; Magnone, Maria Chiara; Perumal, Kalyani; Steigerwalt, Susan; Ju, Wenjun; Bansal, Nisha

    2017-07-01

    Growth differentiation factor-15 (GDF-15) is a member of the TGF- β cytokine superfamily that is widely expressed and may be induced in response to tissue injury. Elevations in GDF-15 may identify a novel pathway involved in loss of kidney function among patients with CKD. Among participants in the Clinical Phenotyping and Resource Biobank (C-PROBE) study and the Seattle Kidney Study (SKS), we tested whether kidney tissue expression of GDF15 mRNA correlates with circulating levels of GDF-15 and whether elevations in circulating GDF-15 are associated with decline in kidney function. In matching samples of 24 patients with CKD from the C-PROBE study, circulating GDF-15 levels significantly correlated with intrarenal GDF15 transcript levels ( r =0.54, P =0.01). Among the 224 C-PROBE and 297 SKS participants, 72 (32.1%) and 94 (32.0%) patients, respectively, reached a composite end point of 30% decline in eGFR or progression to ESRD over a median of 1.8 and 2.0 years of follow up, respectively. In multivariable models, after adjusting for potential confounders, every doubling of GDF-15 level associated with a 72% higher (95% confidence interval, 1.21 to 4.45; P =0.003) and 65% higher (95% confidence interval, 1.08 to 2.50; P =0.02) risk of progression of kidney disease in C-PROBE and SKS participants, respectively. These results show that circulating GDF-15 levels strongly correlated with intrarenal expression of GDF15 and significantly associated with increased risk of CKD progression in two independent cohorts. Circulating GDF-15 may be a marker for intrarenal GDF15 -related signaling pathways associated with CKD and CKD progression. Copyright © 2017 by the American Society of Nephrology.

  11. Growth hormone and insulin-like growth factor-1 in acute myocardial infarction

    DEFF Research Database (Denmark)

    Friberg, L; Werner, S; Eggertsen, G

    2000-01-01

    Growth hormone therapy after myocardial infarction improves cardiac function and survival in animals. Beneficial effects in humans are reported from studies where patients with idiopathic dilated cardiomyopathy were treated with growth hormone. We have studied the role of the endogenous growth...... hormone system in myocardial infarction....

  12. Natural resources as a factor of economic growth in Kosovo

    Directory of Open Access Journals (Sweden)

    Haki Shatri

    2015-11-01

    Full Text Available In the history of the economic growth, there are numerous examples of countries that have developed based on their available natural resources. Especially, these assets have been the propulsion of the development in the initial period. But we also find some cases where countries with limited natural resources have experienced dynamic economic development. Kosovo is the last federal unit dismembered from former Yugoslavia after a decade under Milosevic’s Serbian regime and a two years’ war. International intervention and the inclusion of the country under an international protectorate created the conditions for the development of devastated economy by war and the robbery to be recovered together with the creation of institutional and economic infrastructure (Lidhja e Ekonomistëve të Kosovës, 1996. Under these conditions, everything had to start from scratch. The only development factor that Kosovo possessed was the human factor - age structure and the abundant natural resources, especially in key sectors such as the energy and in mining and minerals, agriculture and tourism. Thus it is sustainable the conclusion that “The rapid and sustainable economic and social development of Kosovo depends substantially from the implementation of the appropriate policies and suitable economic reforms that enable more rational use of its natural and human resources”. The list of the available resources of Kosovo is long. Kosovo possesses significant amount of all mineral raw materials in both quality and quantity terms. Among the most important raw materials have been ranked the power-lignite mining that is stretched into three basins and it is estimated to be around 9 billion exploitable tons (Kelmendi, 2012. Kosovo also owns mineral resources which are found in the Trepca’s Metals basin. The geological researches show favorable conditions of exploitation and high quality of the ore. Mainly one can found the lead, zinc, silver and other

  13. Mental disorders, functional impairment, and nerve growth factor

    Directory of Open Access Journals (Sweden)

    Salles FHM

    2016-12-01

    Full Text Available Fanny Helena Martins Salles,1 Pedro San Martin Soares,1 Carolina David Wiener,1 Thaise Campos Mondin,1 Paula Moraes da Silva,1 Karen Jansen,1–3 Luciano Dias de Mattos Souza,1 Ricardo Azevedo da Silva,1 Jean Pierre Oses1–3 1Translational Science on Brain Disorders, Department of Health and Behavior, Catholic University of Pelotas, Pelotas, Rio Grande do Sul, Brazil; 2Translational Psychiatry Program, 3Center of Excellence on Mood Disorders, Department of Psychiatry and Behavioral Sciences, The University of Texas Health Science Center at Houston (UTHealth Medical School, Houston, TX, USA Abstract: Nerve growth factor (NGF is an important member of the neurotrophin family and its alteration has been associated with psychiatric disorders. Functionality consists of the activities that an individual can perform, as well as their social participation, which is an important factor in analyzing the carrier living conditions of subjects with psychiatric suffering. Several studies have evaluated functionality in bipolar disorder; however, no studies have evaluated the functionality in other mental disorders. There are also few studies investigating the association between functionality and the biological bases of mental disorders. This study aimed to evaluate the serum NGF levels in psychiatric patients and to verify a possible association between the serum neurotrophic levels and functionality. This was a cross-sectional study with a convenient sample obtained from the Public Mental Health Service from the south of Brazil. The final sample was composed of 286 patients enrolled from July 2013 to October 2014. Data was collected using a sociodemographic questionnaire, and the diagnosis was confirmed using the Mini International Neuropsychiatric Interview (M.I.N.I and a Functioning Assessment Short Test. The serum NGF levels were determined using the enzyme-linked immunosorbent assay method. Statistical analyses were performed using IBM SPSS Statistic

  14. Factors influencing growth of the African penguin colony at Boulders ...

    African Journals Online (AJOL)

    This paper reports on growth of the Boulders colony of African penguins Spheniscus demersus from inception in 1985 to the present. More than 900 pairs now breed there. Growth of the colony slowed in 1995 and 1996 and reversed in 1998, coinciding with periods of low abundance of Cape anchovy Engraulis capensis off ...

  15. Radiotherapy and receptor of epidermal growth factor; Radiotherapie et recepteur de l'Epidermal Growth Factor

    Energy Technology Data Exchange (ETDEWEB)

    Deberne, M. [Institut Gustave-Roussy, 94 - Villejuif (France)

    2009-10-15

    The expression level of the receptor of the epidermal growth factor is in correlation with the tumor cells radiosensitivity. An overexpression of the E.G.F.R. is often present in the bronchi cancer, epidermoid carcinomas of the O.R.L. sphere, esophagus, uterine cervix, and anal duct but also in the rectum cancers and glioblastomas. At the clinical level, the E.G.F.R. expression is in correlation with an unfavourable prognosis after radiotherapy in numerous tumoral localizations. In the rectum cancers it is an independent prognosis factor found in multifactorial analysis: increase of the rate of nodes and local recurrence when the E.G.F.R. is over expressed. In the uterine cervix cancers, the survival is is negatively affected in multifactorial analysis by the E.G.F.R. membranes expression level. At the therapy level, the development of anti E.G.F.R. targeted therapies (tyrosine kinase inhibitors and monoclonal antibodies) opens a new therapy field at radio-sensitivity potentiality. The irradiation makes an activation of the E.G.F.R. way that would be partially responsible of the post irradiation tumoral repopulation. This activation leads the phosphorylation of the PI3 kinase ways and M.A.P. kinase ones, then the Akt protein one that acts an apoptotic modulator part. It has been shown that blocking the E.G.F.R. way acts on three levels: accumulation of ells in phase G1, reduction of the cell repair and increasing of apoptosis. he inhibition of post irradiation action of the E.G.F.R. signal way is a factor explaining the ionizing radiation - anti E.G.F.R. synergy. The preclinical data suggest that the E.G.F.R. blocking by the monoclonal antibodies is more important than the use of tyrosine kinase inhibitors. A first positive randomized study with the cetuximab, published in 2006 in the epidermoid carcinomas of the O.R.L. sphere lead to its authorization on the market with the radiotherapy for this localization. The use of cetuximab in other indication with or in

  16. Tenascin C promiscuously binds growth factors via its fifth fibronectin type III-like domain.

    Directory of Open Access Journals (Sweden)

    Laura De Laporte

    Full Text Available Tenascin C (TNC is an extracellular matrix protein that is upregulated during development as well as tissue remodeling. TNC is comprised of multiple independent folding domains, including 15 fibronectin type III-like (TNCIII domains. The fifth TNCIII domain (TNCIII5 has previously been shown to bind heparin. Our group has shown that the heparin-binding fibronectin type III domains of fibronectin (FNIII, specifically FNIII12-14, possess affinity towards a large number of growth factors. Here, we show that TNCIII5 binds growth factors promiscuously and with high affinity. We produced recombinant fragments of TNC representing the first five TNCIII repeats (TNCIII1-5, as well as subdomains, including TNCIII5, to study interactions with various growth factors. Multiple growth factors of the platelet-derived growth factor (PDGF family, the fibroblast growth factor (FGF family, the transforming growth factor beta (TGF-β superfamily, the insulin-like growth factor binding proteins (IGF-BPs, and neurotrophins were found to bind with high affinity to this region of TNC, specifically to TNCIII5. Surface plasmon resonance was performed to analyze the kinetics of binding of TNCIII1-5 with TGF-β1, PDGF-BB, NT-3, and FGF-2. The promiscuous yet high affinity of TNC for a wide array of growth factors, mediated mainly by TNCIII5, may play a role in multiple physiological and pathological processes involving TNC.

  17. Insulin, insulin-like growth factor 1 and insulin-like growth factor binding protein 3 serum concentrations in patients with adenomatous colon polyps

    OpenAIRE

    Janiak, Adam; Oset, Piotr; Talar-Wojnarowska, Renata; Kumor, Anna; Małecka-Panas, Ewa

    2013-01-01

    Introduction Insulin stimulates colonic mucosal cells proliferation directly and by influencing the concentration of insulin-like growth factor 1 (IGF-1) and insulin-like growth factor binding protein 3 (IGFBP-3). Aim To estimate serum concentrations of insulin, IGF-1, and IGFBP-3 and to determine the relationships between them and colorectal adenoma location, dysplasia grading, histological type, and size. Material and methods The study included 60 patients with colorectal adenomatous polyps...

  18. Basic fibroblast growth factor-treated adipose tissue-derived mesenchymal stem cell infusion to ameliorate liver cirrhosis via paracrine hepatocyte growth factor.

    Science.gov (United States)

    Tang, Wei-Ping; Akahoshi, Tomohiko; Piao, Jing-Shu; Narahara, Sayoko; Murata, Masaharu; Kawano, Takahito; Hamano, Nobuhito; Ikeda, Tetsuo; Hashizume, Makoto

    2015-06-01

    Recent studies show that adipose tissue-derived mesenchymal stem cells have potential clinical applications. However, the mechanism has not been fully elucidated yet. Here, we investigated the effect of basic fibroblast growth factor-treated adipose tissue-derived mesenchymal stem cells infusion on a liver fibrosis rat model and elucidated the underlying mechanism. Adipose tissue-derived mesenchymal stem cells were infused into carbon tetrachloride-induced hepatic fibrosis rats through caudal vein. Liver functions and pathological changes were assessed. A co-culture model was used to clarify the potential mechanism. Basic fibroblast growth factor treatment markedly improved the proliferation, differentiation, and hepatocyte growth factor expression ability of adipose tissue-derived mesenchymal stem cells. Although adipose tissue-derived mesenchymal stem cells infusion alone slightly ameliorated liver functions and suppressed fibrosis progression, basic fibroblast growth factor-treatment significantly enhanced the therapeutic effect in association with elevated hepatocyte growth factor expression. Moreover, double immunofluorescence staining confirmed that the infused cells located in fibrosis area. Furthermore, co-culture with adipose tissue-derived mesenchymal stem cell led to induction of hepatic stellate cell apoptosis and enhanced hepatocyte proliferation. However, these effects were significantly weakened by knockdown of hepatocyte growth factor. Mechanism investigation revealed that co-culture with adipose tissue-derived mesenchymal stem cells activated c-jun N-terminal kinase-p53 signaling in hepatic stellate cell and promoted apoptosis. Basic fibroblast growth factor treatment enhanced the therapeutic effect of adipose tissue-derived mesenchymal stem cells, and secretion of hepatocyte growth factor from adipose tissue-derived mesenchymal stem cells plays a critical role in amelioration of liver injury and regression of fibrosis. © 2015 Journal of

  19. Alterations of Growth Factors in Autism and Attention-Deficit/Hyperactivity Disorder

    Science.gov (United States)

    Galvez-Contreras, Alma Y.; Campos-Ordonez, Tania; Gonzalez-Castaneda, Rocio E.; Gonzalez-Perez, Oscar

    2017-01-01

    Growth factors (GFs) are cytokines that regulate the neural development. Recent evidence indicates that alterations in the expression level of GFs during embryogenesis are linked to the pathophysiology and clinical manifestations of attention-deficit/hyperactivity disorder (ADHD) and autism spectrum disorders (ASD). In this concise review, we summarize the current evidence that supports the role of brain-derived neurotrophic factor, insulin-like growth factor 2, hepatocyte growth factor (HGF), glial-derived neurotrophic factor, nerve growth factor, neurotrophins 3 and 4, and epidermal growth factor in the pathogenesis of ADHD and ASD. We also highlight the potential use of these GFs as clinical markers for diagnosis and prognosis of these neurodevelopmental disorders. PMID:28751869

  20. Genetic and environmental factors influencing the Placental Growth Factor (PGF variation in two populations.

    Directory of Open Access Journals (Sweden)

    Rossella Sorice

    Full Text Available Placental Growth Factor (PGF is a key molecule in angiogenesis. Several studies have revealed an important role of PGF primarily in pathological conditions (e.g.: ischaemia, tumour formation, cardiovascular diseases and inflammatory processes suggesting its use as a potential therapeutic agent. However, to date, no information is available regarding the genetics of PGF variability. Furthermore, even though the effect of environmental factors (e.g.: cigarette smoking on angiogenesis has been explored, no data on the influence of these factors on PGF levels have been reported so far. Here we have first investigated PGF variability in two cohorts focusing on non-genetic risk factors: a study sample from two isolated villages in the Cilento region, South Italy (N=871 and a replication sample from the general Danish population (N=1,812. A significant difference in PGF mean levels was found between the two cohorts. However, in both samples, we observed a strong correlation of PGF levels with ageing and sex, men displaying PGF levels significantly higher than women. Interestingly, smoking was also found to influence the trait in the two populations, although differently. We have then focused on genetic risk factors. The association between five single nucleotide polymorphisms (SNPs located in the PGF gene and the plasma levels of the protein was investigated. Two polymorphisms (rs11850328 and rs2268614 were associated with the PGF plasma levels in the Cilento sample and these associations were strongly replicated in the Danish sample. These results, for the first time, support the hypothesis of the presence of genetic and environmental factors influencing PGF plasma variability.

  1. Dietary factors and fibroblast growth factor-23 levels in young adults with African ancestry.

    Science.gov (United States)

    Kosk, Dominique; Kramer, Holly; Luke, Amy; Camacho, Pauline; Bovet, Pascal; Rhule, Jacob Plange; Forrester, Terrence; Wolf, Myles; Sempos, Chris; Melamed, Michal L; Dugas, Lara R; Cooper, Richard; Durazo-Arvizu, Ramon

    2017-11-01

    Fibroblast growth factor-23 (FGF23), a phosphaturic hormone secreted mainly by osteocytes, maintains serum phosphate levels within a tight range by promoting phosphaturia. Previous studies have mainly focused on the link between FGF23 levels and dietary intake of phosphate, but other dietary factors may also influence FGF23 levels. This cross-sectional study pooled three populations of young adults with African ancestry (452 in Chicago, IL, USA; 477 in Victoria, Seychelles; and 482 in Kumasi, Ghana) with estimated glomerular filtration rate >80 ml/min/1.73 m 2 to examine the association of dietary factors based on two 24-h recalls with FGF23 levels measured using a C-terminal assay. Linear regression was used to examine the association between log-transformed FGF23 levels and quartiles of calorie-adjusted dietary factors with adjustment for covariates. In the pooled sample of 1411 study participants, the mean age was 35.2 (6.2) years and 45.3% were male. Median plasma C-terminal FGF23 values in relative units (RU)/ml were 59.5 [interquartile range (IQR) 44.1, 85.3] in the USA, 43.2 (IQR 33.1, 57.9) in Seychelles, and 34.0 (IQR 25.2, 50.4) in Ghana. With adjustment for covariates, increasing quartiles of calcium and animal protein and decreasing quartiles of vegetable protein, fiber, and magnesium intake were associated with significantly higher FGF23 levels compared to the lowest quartile. After further adjustment for dietary factors, significant trends in FGF23 levels were noted only for quartiles of calcium, fiber, and magnesium intake (P < 0.001). Dietary factors other than phosphate are associated with FGF23 levels in young adults.

  2. Effects of octreotide on insulin-like growth factor I and metabolic indices in growth hormone-treated growth hormone-deficient patients

    DEFF Research Database (Denmark)

    Laursen, Torben; Jørgensen, Jens Otto Lunde; Ørskov, Hans

    1993-01-01

    Abstract Animals studies have demonstrated that in addition to inhibiting growth hormone (GH) secretion octreotide inhibits in a direct manner hepatic or peripheral insulin-like growth factor I (IGF-I) generation. To test this hypothesis in humans we studied ten GH-deficient patients with frequent...

  3. The roles of the insulin-like growth factor system and leptin as ...

    African Journals Online (AJOL)

    The roles of the insulin-like growth factor system and leptin as possible mediators of the effects of nutritional restriction on age at puberty and compensatory growth in ... and IGFBP-3 are affected by nutritional restriction and repletion, and may contribute in some measure to the endocrine regulation of compensatory growth.

  4. Expression of growth factor receptors and targeting of EGFR in cholangiocarcinoma cell lines

    International Nuclear Information System (INIS)

    Xu, Ling; Hausmann, Martin; Dietmaier, Wolfgang; Kellermeier, Silvia; Pesch, Theresa; Stieber-Gunckel, Manuela; Lippert, Elisabeth; Klebl, Frank; Rogler, Gerhard

    2010-01-01

    Cholangiocarcinoma (CC) is a malignant neoplasm of the bile ducts or the gallbladder. Targeting of growth factor receptors showed therapeutic potential in palliative settings for many solid tumors. The aim of this study was to determine the expression of seven growth factor receptors in CC cell lines and to assess the effect of blocking the EGFR receptor in vitro. Expression of EGFR (epithelial growth factor receptor), HGFR (hepatocyte growth factor receptor) IGF1R (insulin-like growth factor 1 receptor), IGF2R (insulin-like growth factor 2 receptor) and VEGFR1-3 (vascular endothelial growth factor receptor 1-3) were examined in four human CC cell lines (EGI-1, HuH28, OZ and TFK-1). The effect of the anti-EGFR-antibody cetuximab on cell growth and apoptosis was studied and cell lines were examined for KRAS mutations. EGFR, HGFR and IGFR1 were present in all four cell lines tested. IGFR2 expression was confirmed in EGI-1 and TFK-1. No growth-inhibitory effect was found in EGI-1 cells after incubation with cetuximab. Cetuximab dose-dependently inhibited growth in TFK-1. Increased apoptosis was only seen in TFK-1 cells at the highest cetuximab dose tested (1 mg/ml), with no dose-response-relationship at lower concentrations. In EGI-1 a heterozygous KRAS mutation was found in codon 12 (c.35G>A; p.G12D). HuH28, OZ and TFK-1 lacked KRAS mutation. CC cell lines express a pattern of different growth receptors in vitro. Growth factor inhibitor treatment could be affected from the KRAS genotype in CC. The expression of EGFR itself does not allow prognoses on growth inhibition by cetuximab

  5. [Concentration of plasma vascular endothelial growth factor and related factors in patients with unstable angina pectoris].

    Science.gov (United States)

    He, Wenfang; Wang, Zhe; Cai, Jun; Chi, Hongjie; Yang, Xinchun

    2015-12-01

    To observe plasma vascular endothelial growth factor(VEGF) levels and related factors in patients with unstable angina pectoris(UAP). A total of 108 consecutive patients with chest pain hospitalized in our department from October to December 2014 were included. They were divided into UAP (n=78) and non-CHD group (n=30) by the result of coronary angiography(CAG). Coronary artery lesion was assessed according to the Gensini score, serum lipids, homocysteine(Hcy) levels and other biochemical indicators were also determined. The peripheral arterial tonometry was evaluated by reactive hyperemia index(RHI) measured by Endo-PAT2000 Noninvasive Diagnostic System.The level of plasma VEGF was detected in patients with unstable angina pectoris. Multiple linear regression analysis was used to analyze the correlations between VEGF and various related factors. Percent of male gender, triglyceride (TG) and Hcy levels were significantly higher in UAP group than in no-CHD group(all Punstable angina pectoris, and VEGF level is significantly associated with the degree of coronary artery stenosis, Gensini score and RHI. V EGF level might serve as a new biochemical indicator for coronary artery lesion in patients with UAP.

  6. AN ANALYSIS OF THE RAPID GROWTH FACTORS PRESENTED IN THE LITERATURE OF THE FIELD

    Directory of Open Access Journals (Sweden)

    ALB MARIA

    2015-03-01

    Full Text Available This paper presents the main rapid growth factors, as encountered in literature and discusses the importance and contribution of these factors in achieving the rapid growth, respectively if this growth phenomenon may be achieved in the absence of the aforesaid factors. The paper examines the factors and subfactors considered or found by scholars to have an effect on or be in connection with the rapid growth. A comparative analysis was performed on several studies concerning the rapid growth companies. Among the main factors influencing the rapid growth are those related to the human resources management, the entrepreneur characteritics and the characteristics of the business. The paper also discusses several issues related to the will of the manager or the entrepreneur, repectively the need to understand the role of the factors that intervene when the growth is not wanted and still obtained or when the growth is targeted but not achieved. The conclusion is in agreement with other scholars’ findings reported in the literature. Certain factors correlated with the appropriate actions may lead to the rapid growth. The paper represents a starting point for the study of those management related aspects enabling companies to grow rapidly in the Romanian business environment.

  7. Growth inhibition of thyroid follicular cell-derived cancers by the opioid growth factor (OGF - opioid growth factor receptor (OGFr axis

    Directory of Open Access Journals (Sweden)

    Donahue Renee N

    2009-10-01

    Full Text Available Abstract Background Carcinoma of the thyroid gland is an uncommon cancer, but the most frequent malignancy of the endocrine system. Most thyroid cancers are derived from the follicular cell. Follicular carcinoma (FTC is considered more malignant than papillary thyroid carcinoma (PTC, and anaplastic thyroid cancer (ATC is one of the most lethal human cancers. Opioid Growth Factor (OGF; chemical term - [Met5]-enkephalin and its receptor, OGFr, form an inhibitory axis regulating cell proliferation. Both the peptide and receptor have been detected in a wide variety of cancers, and OGF is currently used clinically as a biotherapy for some non-thyroid neoplasias. This study addressed the question of whether the OGF-OGFr axis is present and functional in human thyroid follicular cell - derived cancer. Methods Utilizing human ATC (KAT-18, PTC (KTC-1, and FTC (WRO 82-1 cell lines, immunohistochemistry was employed to ascertain the presence and location of OGF and OGFr. The growth characteristics in the presence of OGF or the opioid antagonist naltrexone (NTX, and the specificity of opioid peptides for proliferation of ATC, were established in KAT-18 cells. Dependence on peptide and receptor were investigated using neutralization studies with antibodies and siRNA experiments, respectively. The mechanism of peptide action on DNA synthesis and cell survival was ascertained. The ubiquity of the OGF-OGFr axis in thyroid follicular cell-derived cancer was assessed in KTC-1 (PTC and WRO 82-1 (FTC tumor cells. Results OGF and OGFr were present in KAT-18 cells. Concentrations of 10-6 M OGF inhibited cell replication up to 30%, whereas NTX increased cell growth up to 35% relative to cultures treated with sterile water. OGF treatment reduced cell number by as much as 38% in KAT-18 ATC in a dose-dependent and receptor-mediated manner. OGF antibodies neutralized the inhibitory effects of OGF, and siRNA knockdown of OGFr negated growth inhibition by OGF. Cell survival

  8. Exposure to nerve growth factor worsens nephrotoxic effect induced by Cyclosporine A in HK-2 cells.

    Directory of Open Access Journals (Sweden)

    Donatella Vizza

    Full Text Available Nerve growth factor is a neurotrophin that promotes cell growth, differentiation, survival and death through two different receptors: TrkA(NTR and p75(NTR. Nerve growth factor serum concentrations increase during many inflammatory and autoimmune diseases, glomerulonephritis, chronic kidney disease, end-stage renal disease and, particularly, in renal transplant. Considering that nerve growth factor exerts beneficial effects in the treatment of major central and peripheral neurodegenerative diseases, skin and corneal ulcers, we asked whether nerve growth factor could also exert a role in Cyclosporine A-induced graft nephrotoxicity. Our hypothesis was raised from basic evidence indicating that Cyclosporine A-inhibition of calcineurin-NFAT pathway increases nerve growth factor expression levels. Therefore, we investigated the involvement of nerve growth factor and its receptors in the damage exerted by Cyclosporine A in tubular renal cells, HK-2. Our results showed that in HK-2 cells combined treatment with Cyclosporine A + nerve growth factor induced a significant reduction in cell vitality concomitant with a down-regulation of Cyclin D1 and up-regulation of p21 levels respect to cells treated with Cyclosporine A alone. Moreover functional experiments showed that the co-treatment significantly up-regulated human p21promoter activity by involvement of the Sp1 transcription factor, whose nuclear content was negatively regulated by activated NFATc1. In addition we observed that the combined exposure to Cyclosporine A + nerve growth factor promoted an up-regulation of p75 (NTR and its target genes, p53 and BAD leading to the activation of intrinsic apoptosis. Finally, the chemical inhibition of p75(NTR down-regulated the intrinsic apoptotic signal. We describe two new mechanisms by which nerve growth factor promotes growth arrest and apoptosis in tubular renal cells exposed to Cyclosporine A.

  9. Factors affecting growth of foodborne pathogens on minimally processed apples.

    Science.gov (United States)

    Alegre, Isabel; Abadias, Maribel; Anguera, Marina; Oliveira, Marcia; Viñas, Inmaculada

    2010-02-01

    Escherichia coli O157:H7, Salmonella and Listeria innocua increased by more than 2 log(10) units over a 24 h period on fresh-cut 'Golden Delicious' apple plugs stored at 25 and 20 degrees C. L. innocua reached the same final population level at 10 degrees C meanwhile E. coli and Salmonella only increased 1.3 log(10) units after 6 days. Only L. innocua was able to grow at 5 degrees C. No significant differences were observed between the growth of foodborne pathogens on fresh-cut 'Golden Delicious', 'Granny Smith' and 'Shampion' apples stored at 25 and 5 degrees C. The treatment of 'Golden Delicious' and 'Granny Smith' apple plugs with the antioxidants, ascorbic acid (2%) and NatureSeal (6%), did not affect pathogen growth. The effect of passive modified atmosphere packaging (MAP) on the growth of E. coli, Salmonella and L. innocua on 'Golden Delicious' apple slices was also tested. There were no significant differences in growth of pathogens in MAP conditions compared with air packaging of 'Golden Delicious' apple plugs, but the growth of mesophilic and psychrotrophic microorganisms was inhibited. These results highlight the importance of avoiding contamination of fresh-cut fruit with foodborne pathogens and the maintenance of the cold chain during storage until consumption.

  10. A new role of growth hormone and insulin growth factor receptor type 1 in neonatal inflammatory nociception

    Directory of Open Access Journals (Sweden)

    Alfredo Manzano-García

    2017-08-01

    Full Text Available Abstract. Growth hormone (GH and insulin growth factor 1 (IGF1 are implicated in nociceptive processing; it has been reported that the latter participates in neonatal inflammatory nociception. In the target article, the authors propose that local inflammation evoked by carrageenan administration in mice produces a decrease in the local GH levels and an increment of IGF1 receptors type 1 expression, this produces behavioral nociception and peripheral sensitization that can be prevented by GH systemic administration pretreatment.

  11. Vascular endothelial growth factor A and vascular endothelial growth factor receptor 2 expression in non-small cell lung cancer patients: relation to prognosis

    DEFF Research Database (Denmark)

    Bonnesen, Barbara; Pappot, Helle; Holmstav, Julie

    2009-01-01

    elements in neoplastic cells and their microenvironment have recently been and are continuously developed including drugs inhibiting the angiogenic system. Angiogenic factor vascular endothelial growth factor (VEGF) and its receptor vascular endothelial growth factor receptor 2 (VEGFR2) seem to play key......BACKGROUND: The majority of patients with non-small cell lung cancer (NSCLC) are diagnosed with advanced inoperable disease. While treatment with conventional chemotherapy has improved during the last decade the 5 years survival is still modest. Novel drugs, which selectively target aberrant...

  12. Concentration of platelets and growth factors in platelet-rich plasma from Goettingen minipigs.

    Science.gov (United States)

    Jungbluth, Pascal; Grassmann, Jan-Peter; Thelen, Simon; Wild, Michael; Sager, Martin; Windolf, Joachim; Hakimi, Mohssen

    2014-01-01

    In minipigs little is known about the concentration of growth factors in plasma, despite their major role in several patho-physiological processes such as healing of fractures. This prompted us to study the concentration of platelets and selected growth factors in plasma and platelet-rich plasma (PRP) preparation of sixteen Goettingen minipigs. Platelet concentrations increased significantly in PRP in comparison to native blood plasma. Generally, significant increase in the concentration of all growth factors tested was observed in the PRP in comparison to the corresponding plasma or serum. Five of the plasma samples examined contained detectable levels of bone morphogenic protein 2 (BMP-2) whereas eleven of the plasma or serum samples contained minimal amounts of vascular endothelial growth factor (VEGF) and platelet-derived growth factor (PDGF-bb) respectively. On the other hand variable concentrations of bone morphogenic protein 7 (BMP-7) and transforming growth factor β1 (TGF-β1) were measured in all plasma samples. In contrast, all PRP samples contained significantly increased amounts of growth factors. The level of BMP-2, BMP-7, TGF-β1, VEGF and PDGF-bb increased by 17.6, 1.5, 7.1, 7.2 and 103.3 fold, in comparison to the corresponding non-enriched preparations. Moreover significant positive correlations were found between platelet count and the concentrations of BMP-2 (r=0.62, pplatelet-rich plasma of minipigs which might thus serve as a source of autologous growth factors.

  13. Peritoneal transforming growth factor beta-1 expression during laparoscopic surgery: a clinical trial

    NARCIS (Netherlands)

    Brokelman, Walter J. A.; Holmdahl, Lena; Bergström, Maria; Falk, Peter; Klinkenbijl, Jean H. G.; Klinkonbijl, Jean H. G.; Reijnen, Michel M. P. J.; Reijnen, Michael M. P. J.

    2007-01-01

    Transforming growth factor-beta 1 (TGF-beta1) is a growth factor involved in various biologic processes, including peritoneal wound healing and dissemination of malignancies. Laparoscopic surgery is evolving rapidly, and indications are increasing. The peritoneal TGF-beta1 expression during

  14. Mechanism of divergent growth factor effects in mesenchymal stem cell differentiation

    DEFF Research Database (Denmark)

    Kratchmarova, Irina; Blagoev, Blagoy; Haack-Sorensen, M.

    2005-01-01

    Closely related signals often lead to very different cellular outcomes. We found that the differentiation of human mesenchymal stem cells into bone-forming cells is stimulated by epidermal growth factor (EGF) but not platelet-derived growth factor (PDGF). We used mass spectrometry-based proteomics...

  15. The role of sialoadenectomy and epıdermal growth factor (EGF) in ...

    African Journals Online (AJOL)

    USER

    2010-05-17

    May 17, 2010 ... result, epidermal growth factor was concluded to have an important role in skin development. Key words: Epidermal growth factor, ... sialoadenectomy on epiderm and the role of EGF and antiserum EGF in prevention of .... remarkable finding in skin healing of sialoadenectomy and normal rats. According to ...

  16. Human insulin-like growth factor II leader 2 mediates internal initiation of translation

    DEFF Research Database (Denmark)

    Pedersen, Susanne; Christiansen, Jan; Hansen, T.O.

    2002-01-01

    Insulin-like growth factor II (IGF-II) is a fetal growth factor, which belongs to the family of insulin-like peptides. During fetal life, the IGF-II gene generates three mRNAs with different 5' untranslated regions (UTRs), but identical coding regions and 3' UTRs. We have shown previously that IG...

  17. Growth factor therapy sequesters inflammation in affording neuroprotection in cerebrovascular diseases.

    Science.gov (United States)

    Nguyen, Hung; Aum, David; Mashkouri, Sherwin; Rao, Gautam; Vega Gonzales-Portillo, Juan Diego; Reyes, Stephanny; Borlongan, Cesario V

    2016-08-01

    In recent years, accumulating evidence has demonstrated the key role of inflammation in the progression of cerebrovascular diseases. Inflammation can persist over prolonged period of time after the initial insult providing a wider therapeutic window. Despite the acute endogenous upregulation of many growth factors after the injury, it is not sufficient to protect against inflammation and to regenerate the brain. Therapeutic approaches targeting both dampening inflammation and enhancing growth factors are likely to provide beneficial outcomes in cerebrovascular disease. In this mini review, we discuss major growth factors and their beneficial properties to combat the inflammation in cerebrovascular diseases. Emerging biotechnologies which facilitate the therapeutic effects of growth factors are also presented in an effort to provide insights into the future combination therapies incorporating both central and peripheral abrogation of inflammation. Expert commentary: Many studies discussed in this review have demonstrated the therapeutic effects of growth factors in treating cerebrovascular diseases. It is unlikely that one growth factor can be used to treat these complex diseases. Combination of growth factors and anti-inflammatory modulators may clinically improve outcomes for patients. In particular, transplantation of stem cells may be able to achieve both goals of modulating inflammation and upregulating growth factors. Large preclinical studies and multiple laboratory collaborations are needed to advance these findings from bench to bedside.

  18. Chronically increased ciliary neurotrophic factor and fibroblast growth factor-2 expression after spinal contusion in rats.

    Science.gov (United States)

    Tripathi, Richa B; McTigue, Dana M

    2008-09-10

    Demyelination and oligodendrocyte loss following spinal cord injury (SCI) are well documented. Recently, we showed oligodendrocyte progenitor cell (OPC) accumulation and robust oligodendrocyte genesis occurring along SCI lesion borders. We have since begun investigating potential mechanisms for this endogenous repair response. Here, we examined ciliary neurotrophic factor (CNTF) and fibroblast growth factor-2 (FGF-2) expression, because both factors alter progenitor proliferation and differentiation and are increased in several CNS disorders. We hypothesized that CNTF and FGF-2 would increase after SCI, especially in regions of enhanced oligogenesis. First, CNTF protein was quantified using Western blots, which revealed that CNTF protein continually rose through 28 days post injury (dpi). Next, by using immunohistochemistry, we examined the spatiotemporal expression of CNTF in cross-sections spanning the injury site. CNTF immunoreactivity was observed on astrocytes and oligodendrocytes in naïve and contused spinal cords. Significantly increased CNTF was detected in spared white and gray matter between 5 and 28 dpi compared with uninjured controls. By 28 dpi, CNTF expression was significantly higher along lesion borders compared with outlying spared tissue; a similar distribution of phosphorylated STAT3, a transcription factor up-regulated by CNTF and to a lesser extent FGF-2, was also detected. Because CNTF can potentiate FGF-2 expression, we examined the distribution of FGF-2+ cells. Significantly more FGF-2+ cells were noted along lesion borders at 7 and 28 dpi. Thus, both CNTF and FGF-2 are present in regions of elevated OPC proliferation and oligodendrocyte generation after SCI and therefore may play a role in injury-induced gliogenesis. (c) 2008 Wiley-Liss, Inc.

  19. Donor age and gestational age influence on growth factor levels in human amniotic membrane.

    Science.gov (United States)

    López-Valladares, Maria J; Teresa Rodríguez-Ares, M; Touriño, Rosario; Gude, Francisco; Teresa Silva, M; Couceiro, Jose

    2010-09-01

    Amniotic membrane (AM) is used as a biomaterial for reconstruction in ocular surface surgery. This study investigated the influence of interdonor variations and processing and preservation procedures applied to the AM on growth factors and protein levels.  Samples of human AM from thirteen donors were analysed. Collected donor data were age, parity and gestational age. Total protein amount was measured in extracts of intact AM nonpreserved, lyophilized and cryopreserved, at -80°C and in liquid nitrogen. An enzyme-linked immunosorbent assay (ELISA) was used to assay growth factors protein levels for epidermal growth factor, basic fibroblast growth factor (bFGF), hepatocyte growth factor (HGF), keratinocyte growth factor (KGF), transforming growth factor beta1 (TFG-β(1) ) and nerve growth factor (NGF). Univariate and multivariate statistical analyses were used to study the influence of the preservation method applied and interdonor variations on growth factors levels. We detected important variations in growth factors and protein concentrations between samples from different donors. Total protein amount, bFGF, HGF, KGF and TGF-β(1) showed lower levels in samples from donors with higher gestational ages and donor ages, for all groups. The variability in the biochemical composition of AM from different donors is considerable, and it is related with donor factors as donor age and gestational age. As AM biochemical composition has a role in its therapeutic effects, these variations could affect the clinical results of amniotic membrane transplantation and must be taken into account in donor selection processes. © 2010 The Authors. Journal compilation © 2010 Acta Ophthalmol.

  20. Growth factors and early mesoderm morphogenesis: insights from the sea urchin embryo.

    Science.gov (United States)

    Adomako-Ankomah, Ashrifia; Ettensohn, Charles A

    2014-03-01

    The early morphogenesis of the mesoderm is critically important in establishing the body plan of the embryo. Recent research has led to a better understanding of the mechanisms that underlie this process, and growth factor signaling pathways have emerged as key regulators of the directional movements of mesoderm cells during gastrulation. In this review, we undertake a comparative analysis of the various essential functions of growth factor signaling pathways in regulating early mesoderm morphogenesis, with an emphasis on recent advances in the sea urchin embryo. We focus on the roles of the vascular endothelial growth factor (VEGF) and fibroblast growth factor (FGF) pathways in the migration of primary mesenchyme cells and the formation of the embryonic endoskeleton. We compare the functions of VEGF and FGF in sea urchins with the roles that these and other growth factors play in regulating mesoderm migration during gastrulation in Drosophila and vertebrates. Copyright © 2014 Wiley Periodicals, Inc.

  1. Multistep change in epidermal growth factor receptors during spontaneous neoplastic progression in Chinese hamster embryo fibroblasts

    International Nuclear Information System (INIS)

    Wakshull, E.; Kraemer, P.M.; Wharton, W.

    1985-01-01

    Whole Chinese hamster embryo lineages have been shown to undergo multistep spontaneous neoplastic progression during serial passage in culture. The authors have studied the binding, internalization, and degradation of 125 I-labeled epidermal growth factor at four different stages of transformation. The whole Chinese hamster embryo cells lost cell surface epidermal growth factor receptors gradually during the course of neoplastic progression until only 10% of the receptor number present in the early-passage cells (precrisis) were retained in the late-passage cells (tumorigenic). No differences in internalization rates, chloroquine sensitivity, or ability to degrade hormone between the various passage levels were seen. No evidence for the presence in conditioned medium of transforming growth factors which might mask or down-regulate epidermal growth factor receptor was obtained. These results suggest that a reduction in cell surface epidermal growth factor receptor might be an early event during spontaneous transformation in whole Chinese hamster embryo cells

  2. Glycosaminoglycan synthesis and shedding induced by growth factors are cell and compound specific.

    Science.gov (United States)

    Suarez, Eloah R; Nohara, Angela S; Mataveli, Fábio D; de Matos, Leandro L; Nader, Helena B; Pinhal, Maria Aparecida S

    2007-02-01

    The interactions between growth factors and sulphated glycosaminoglycans (GAG) have been extensively studied. The aim of this study is to investigate if growth factors would show specificity of action on the synthesis and shedding of sulphated GAG, using two different cell lines: endothelial and smooth muscle cells. The cells were grown in the presence or absence of growth factors: EGF, FGF2, VEGF121, VEGF165. Transfection assays were also performed using recombinant pcDNA3.1, containing VEGF165 cDNA. In order to analyse the different types of GAG the cells were metabolically labelled with [(35)S]-sulphate. At low doses, VEGF121 was the only growth factor able to increase both the synthesis and secretion of heparan sulphate (HS) in endothelial cells. Over expression of VEGF165 stimulated HS synthesis in both cells. The combined results showed that growth factors affect GAG synthesis in a cell specific and dose dependent manner.

  3. Preparation of cultured skin for transplantation using insulin-like growth factor I in conjunction with insulin-like growth factor binding protein 5, epidermal growth factor, and vitronectin.

    Science.gov (United States)

    Dawson, Rebecca A; Upton, Zee; Malda, Jos; Harkin, Damien G

    2006-06-27

    Cultured skin for transplantation is routinely prepared by growing patient keratinocytes in the presence of semidefined sources of growth factors including serum and feeder cells, but these materials require substantial risk remediation and can contribute to transplant rejection. We have therefore investigated the potential of a novel combination of recombinant and purified growth factors to replace serum and feeder cells in cultures of human keratinocytes suitable for clinical application. Our technique was investigated with respect to culture establishment, serial propagation, colony-forming efficiency, immunocytochemistry, epidermal reconstruction, and suitability to support transplantation by aerosolization. We demonstrate that insulin-like growth factor (IGF)-I--used in conjunction with epidermal growth factor (EGF), insulin-like growth factor binding protein (IGFBP)-5 and vitronectin--supports growth in the absence of serum. Moreover, a threefold greater number of cells are generated within 7 days compared to those grown under current best practice conditions using serum (P<0.05). The resulting test cultures are suitable for epidermal reconstruction and support the option for delivery in the form of an aerosolized cell suspension. Serial propagation, with the view to producing confluent sheets for extensive injuries, was achieved but with less consistency and this result correlated with a significant decline in colony-forming efficiency compared to controls. IGF-I used in conjunction with IGFBP-5, EGF, and vitronectin provides a superior alternative to serum for the rapid expansion and transplantation of cultured keratinocytes within the first week of treatment. Nevertheless, further optimization is required with respect to elimination of feeder cells and serial expansion of cultures for treatment of extensive injuries.

  4. Anti-vascular endothelial growth factor for neovascular glaucoma.

    Science.gov (United States)

    Simha, Arathi; Braganza, Andrew; Abraham, Lekha; Samuel, Prasanna; Lindsley, Kristina

    2013-10-02

    Neovascular glaucoma (NVG) is a potentially blinding secondary glaucoma. It is caused by the formation of abnormal new blood vessels which prevent normal drainage of aqueous from the anterior segment of the eye. Anti-vascular endothelial growth factor (anti-VEGF) agents are specific inhibitors of the primary mediators of neovascularization. Studies have reported the effectiveness of anti-VEGFs for the control of intraocular pressure (IOP) in NVG. To compare the IOP lowering effects of intraocular anti-VEGF agents to no anti-VEGF treatment, as an adjunct to existing modalities for the treatment of NVG. We searched CENTRAL (which contains the Cochrane Eyes and Vision Group Trials Register) (The Cochrane Library 2012, Issue 12), Ovid MEDLINE, Ovid MEDLINE In-Process and Other Non-Indexed Citations, Ovid MEDLINE Daily, Ovid OLDMEDLINE, (January 1950 to January 2013), EMBASE (January 1980 to January 2013), Latin American and Caribbean Literature on Health Sciences (LILACS) (January 1982 to January 2013), the metaRegister of Controlled Trials (mRCT) (www.controlled-trials.com), ClinicalTrials.gov (www.clinicaltrials.gov/) and the WHO International Clinical Trials Registry Platform (ICTRP) (www.who.int/ictrp/search/en). We did not use any date or language restrictions in the electronic searches for trials. We last searched the electronic databases on 11 January 2013. We included randomized controlled trials (RCTs) and quasi-RCTs of people treated with anti-VEGF agents for NVG. Two authors independently assessed the search results for trials to be included in the review. Discrepancies were resolved by discussion with a third author. Since no trial met our inclusion criteria, no assessment of risk of bias or meta-analysis was undertaken. No RCTs were found that met the inclusion criteria for this review. Two RCTs of anti-VEGF agents for treating NVG were not included in the review due to the heterogeneity and uncontrolled assignment of adjunct treatments received by the

  5. Transforming growth factor-beta, but not ciliary neurotrophic factor, inhibits DNA synthesis of adrenal medullary cells in vitro

    DEFF Research Database (Denmark)

    Wolf, N; Krohn, K; Bieger, S

    1999-01-01

    of fibroblast growth factor-2 and insulin-like growth factor-II, transforming growth factor-beta1 (0.08 nM) reduced 5-bromo-2'-deoxyuridine labeling by about 50%, without interfering with chromaffin cell survival or death. Doses lower and higher than 0.08 nM were less effective. Similar effects were seen...... immunocytochemistry as a marker for young postnatal rat chromaffin cells, we show that treatment with fibroblast growth factor-2 (1 nM) and insulin-like growth factor-II (10 nM) increased the fraction of 5-bromo-2'-deoxyuridine-labeled nuclei from 1% to about 40% of the cells in the absence of serum. In the presence...... by the neuroendocrine chromaffin cells, which also express the transforming growth factor-beta receptor type II. In contrast to the developmentally related sympathetic neurons, chromaffin cells continue to proliferate throughout postnatal life. Using 5-bromo-2'-deoxyuridine pulse labeling and tyrosine hydroxylase...

  6. Ignored Aetiologic Factors of Growth Faltering/Stunting In Sierra ...

    African Journals Online (AJOL)

    Until recently, the role of aflatoxins as a causative agent of stunting was never explored. Recent studies carried out in Benin, Togo and The Gambia have implicated aflatoxin in the aetiology of stunting/growth faltering in children. Studies carried out in the Southern province (Bo and Njala) have demonstrated that children not ...

  7. Factors Associated with Growth in Daily Smoking among Indigenous Adolescents

    Science.gov (United States)

    Whitlock, Les B.; Sittner Hartshorn, Kelley J.; McQuillan, Julia; Crawford, Devan M.

    2012-01-01

    North American Indigenous adolescents smoke earlier, smoke more, and are more likely to become regular smokers as adults than youth from any other ethnic group, yet we know very little about their early smoking trajectories. We use multilevel growth modeling across five waves of data from Indigenous adolescents (aged 10-13 years at Wave 1) to…

  8. Influence of bioregion and environmental factors on the growth, size ...

    African Journals Online (AJOL)

    2017-06-28

    Jun 28, 2017 ... production and reproduction traits of Bonsmara cows were analysed by means of cluster analysis and analysis of variance ..... Table 3 Effects of bioregion on growth and size traits (Least square means and standard errors (S.E)) of. Bonsmara ..... Burfening P.J., Kress, D.D. & Hanford K. 1987. Effect of region ...

  9. Manipulation of photoperiod in growth factors of beluga sturgeon ...

    African Journals Online (AJOL)

    USER

    2010-03-29

    Mar 29, 2010 ... The fifteen manipulated photoperiod tanks were covered by black nylon screens and the daylight lamps placed. 1 m above tanks with controlling digital timers. A random sample of three individuals per tank was taken in each biometric time for measuring the biometrical data. Specific growth rate (SGR) was ...

  10. Bank market power, factor reallocation, and aggregate growth

    NARCIS (Netherlands)

    Inklaar, Robert; Koetter, Michael; Noth, Felix

    Using a unique firm-level sample of approximately 700,000 firm-year observations of German small and medium-sized enterprises (SMEs), this study seeks to identify the effect of bank market power on aggregate growth components. We test for a pre-crisis sample whether bank market power spurs or

  11. Non-genetic factors affecting growth performance and carcass ...

    African Journals Online (AJOL)

    South African Journal of Animal Science ... This study was based on 20 079 and 12 169 growth and 5 406 and 2 533 carcass data collected on performance tested pigs between 1990 and 2008 from Large White and Landrace breeds ... Herd of origin, year of testing and their interaction significantly affected all traits.

  12. Decreased plasma brain-derived neurotrophic factor and vascular endothelial growth factor concentrations during military training.

    Directory of Open Access Journals (Sweden)

    Go Suzuki

    Full Text Available Decreased concentrations of plasma brain-derived neurotrophic factor (BDNF and serum BDNF have been proposed to be a state marker of depression and a biological indicator of loaded psychosocial stress. Stress evaluations of participants in military mission are critically important and appropriate objective biological parameters that evaluate stress are needed. In military circumstances, there are several problems to adopt plasma BDNF concentration as a stress biomarker. First, in addition to psychosocial stress, military missions inevitably involve physical exercise that increases plasma BDNF concentrations. Second, most participants in the mission do not have adequate quality or quantity of sleep, and sleep deprivation has also been reported to increase plasma BDNF concentration. We evaluated plasma BDNF concentrations in 52 participants on a 9-week military mission. The present study revealed that plasma BDNF concentration significantly decreased despite elevated serum enzymes that escaped from muscle and decreased quantity and quality of sleep, as detected by a wearable watch-type sensor. In addition, we observed a significant decrease in plasma vascular endothelial growth factor (VEGF during the mission. VEGF is also neurotrophic and its expression in the brain has been reported to be up-regulated by antidepressive treatments and down-regulated by stress. This is the first report of decreased plasma VEGF concentrations by stress. We conclude that decreased plasma concentrations of neurotrophins can be candidates for mental stress indicators in actual stressful environments that include physical exercise and limited sleep.

  13. Gene expression of fibroblast growth factors in human gliomas and meningiomas: Demonstration of cellular source of basic fibroblast growth factor mRNA and peptide in tumor tissues

    International Nuclear Information System (INIS)

    Takahashi, J.A.; Mori, Hirotaka; Fukumoto, Manabu; Oda, Yoshifumi; Kikuchi, Haruhiko; Hatanaka, Masakazu; Igarashi, Koichi; Jaye, M.

    1990-01-01

    The growth autonomy of human tumor cells is considered due to the endogenous production of growth factors. Transcriptional expression of candidates for autocrine stimulatory factors such as basic fibroblast growth factor (FGF), acidic FGF, and transforming growth factor type β were determined in human brain tumors. Basic FGF was expressed abundantly in 17 of 18 gliomas, 20 of 22 meningiomas, and 0 of 5 metastatic brain tumors. The level of mRNA expression of acidic FGF in gliomas was significant. In contrast, transforming growth factor type β1 was expressed in all the samples investigated. The mRNA for basic FGF and its peptide were localized in tumor cells in vivo by in situ hybridization and immunohistochemistry, showing that basic FGF is actually produced in tumor cells. The results suggest that tumor-derived basic FGF is involved in the progression of gliomas and meningiomas in vivo, whereas acidic FGF is expressed in a tumor origin-specific manner, suggesting that acidic FGF works in tandem with basic FGF in glioma tumorigenesis

  14. Demography, Education, and the Future of Total Factor Productivity Growth

    OpenAIRE

    Sanderson, W.C.; Striessnig, E.

    2009-01-01

    In this paper we present new data on total factor productivity for eight world regions over the period 1970 to 2001. The regions are North America, Western Europe, Japan/Oceania, the China Region, South Asia, Other Pacific Asia, Latin America and the Caribbean, and Sub-Saharan Africa. We propose and estimate a new model of the determinants of total factor productivity based on the framework of conditional convergence. The model allows us to distinguish between factors that influence the level...

  15. Correlation between Nerve Growth Factor (NGF with Brain Derived Neurotropic Factor (BDNF in Ischemic Stroke Patient

    Directory of Open Access Journals (Sweden)

    Joko Widodo

    2016-05-01

    Full Text Available Background: The neurotrophins nerve growth factor (NGF and brain-derived neurotrophic factor (BDNF is a family of polypeptides that play critical role during neuronal development, appear to mediate protective role on neurorepair in ischemic stroke. Naturally in adult brain neurorepair process consist of: angiogenesis, neurogenesis, and neuronal plasticity, it can also be stimulated by endogenous neurorepair. In this study we observed correlation between NGF and BDNF ischemic stroke patient’s onset: 7-30 and over 30 days. Methods: This is cross sectional study on 46 subjects aged 38 – 74 years old with ischemic stroke from The Indonesian Central Hospital of Army Gatot Subroto Jakarta. Diagnosis of ischemic stroke was made using clinical examination and magnetic resonance imaging (MRI by neurologist. Subjects were divided into 2 groups based on stroke onset: 7 – 30 days (Group A: 19 subjects and > 30 days (Group B: 27 Subjects. Serum NGF levels were measured with ELISA method and BDNF levels were measured using multiplex method with Luminex Magpix. Results: Levels of NGF and BDNF were significantly different between onset group A and B (NGF p= 0.022, and BDNF p=0.008, with mean levels NGF in group A higher than group B, indicating that BDNF levels is lower in group A than group B. There was no significant correlation between NGF and BDNF levels in all groups. Conclusion: The variations in neurotrophic factor levels reflect an endogenous attempt at neuroprotection against biochemical and molecular changes after ischemic stroke. NGF represents an early marker of brain injury while BDNF recovery is most prominent during the first 14 days after onsite but continuous for more than 30 days. There is no significant correlation between NGF and BDNF in each group.  

  16. Exogenous growth factors do not affect the development of individually cultured murine embryos.

    Science.gov (United States)

    Herrick, Jason R; Greene-Ermisch, Alison F; Schoolcraft, William B; Krisher, Rebecca L

    2017-12-21

    The objective of this study was to evaluate the effects of multiple growth factors on the development of individually cultured murine embryos. Embryos produced by in vitro fertilization using in vitro (IVM) or in vivo (IVO) matured oocytes from three strains of mice (CF1, Swiss Webster, B6D2F1) were cultured individually (10 μl) in the absence (control) or presence of growth factors (paf, epidermal growth factor [EGF], insulin-like growth factor 1 [IGF-1], and granulocyte-macrophage colony-stimulating factor [GM-CSF]). Blastocyst formation, hatching, and blastocyst cell numbers (trophectoderm, inner cell mass, and total) were evaluated on days 4 and 5 of culture. Post-hatching development of CF1 IVO embryos was also evaluated in vitro and in vivo. The presence of growth factors did not improve the proportion of embryos forming blastocysts or initiating hatching for any of the types of embryos tested. The only significant (P embryos that formed blastocysts by day 5 in CF1 IVM embryos. The presence of growth factors also did not affect blastocyst cell numbers. For CF1 IVO embryos, the presence of growth factors during culture did not affect the proportion of embryos that attached to fibronectin-coated dishes, the size of the resulting outgrowths, or in vivo development following transfer. Combinations of paf, EGF, GM-CSF, and IGF-1 did not improve development of murine embryos cultured individually in a sequential medium containing a defined protein source.

  17. Rearing Mozambique tilapia in tidally-changing salinities: Effects on growth and the growth hormone/insulin-like growth factor I axis.

    Science.gov (United States)

    Moorman, Benjamin P; Yamaguchi, Yoko; Lerner, Darren T; Grau, E Gordon; Seale, Andre P

    2016-08-01

    The growth hormone (GH)/insulin-like growth factor (IGF) axis plays a central role in the regulation of growth in teleosts and has been shown to be affected by acclimation salinity. This study was aimed at characterizing the effects of rearing tilapia, Oreochromis mossambicus, in a tidally-changing salinity on the GH/IGF axis and growth. Tilapia were raised in fresh water (FW), seawater (SW), or in a tidally-changing environment, in which salinity is switched between FW (TF) and SW (TS) every 6h, for 4months. Growth was measured over all time points recorded and fish reared in a tidally-changing environment grew significantly faster than other groups. The levels of circulating growth hormone (GH), insulin-like growth factor I (IGF-I), pituitary GH mRNA, gene expression of IGF-I, IGF-II, and growth hormone receptor 2 (GHR) in the muscle and liver were also determined. Plasma IGF-I was higher in FW and TS than in SW and TF tilapia. Pituitary GH mRNA was higher in TF and TS than in FW and SW tilapia. Gene expression of IGF-I in the liver and of GHR in both the muscle and liver changed between TF and TS fish. Fish growth was positively correlated with GH mRNA expression in the pituitary, and GHR mRNA expression in muscle and liver tissues. Our study indicates that rearing fish under tidally-changing salinities elicits a distinct pattern of endocrine regulation from that observed in fish reared in steady-state conditions, and may provide a new approach to increase tilapia growth rate and study the regulation of growth in euryhaline fish. Copyright © 2016 Elsevier Inc. All rights reserved.

  18. Paths of economic development: modelling factors of endogenous growth

    OpenAIRE

    Fusari, Angelo

    1994-01-01

    This article sets out a model giving an interpretation of the engine of economic development and growth, and business cycle. Based on a peculiar concept of dynamic competition, the model explains innovation and uncertainty and describes the way equilibrating and disequilibrating processes are intertwined and operate. It also carries out concise application to successive stages of economic development, along with some econometric application, that demonstrates the degree of gene...

  19. Genetic And Environmental Factors Affecting Growth Traits Of Goats ...

    African Journals Online (AJOL)

    Growth performance of 194 kids of Sahel (S), Red Sokoto (RS) and West African Dwarf (WAD) breeds of goats from birth to 9 months of age was studied. Effect of breed was significant (p<0.001) with S (2.07kg – 13.49kg) breed being heavier than RS (1.81kg – 13.77kg) and WAD (1.42KG – 8.63 kg) though they were ...

  20. Signal transduction growth factors: the effective governance of transcription and cellular adhesion in cancer invasion.

    Science.gov (United States)

    Di Domenico, Marina; Giordano, Antonio

    2017-05-30

    Giulio Bizzozero classified the tissues concerning their capacity to self-renew during the adult life in labile, stable and permanent tissues. In 1940 Viktor Hamburger and Rita Levi Montalcini exposed the possibility to induce the growth of permanent cells thanks to a specific ligand Nerve Growth Factor (NGF). Stanley Cohen purified a protein the Epidermal Growth Factor (EGF), able to induce epidermis proliferation and to elicit precocious eye disclosure and teeth eruption, establishing the "inverse" relationships between the proliferation and differentiation. These two biological effects induced by EGF were according to EGFR signaling is involved in a large array of cellular functions such as proliferation, survival, adhesion, migration and differentiation. This review is focused on the key role of growth factors signaling and their downstream effectors in physiological and in pathological phenomena, the authors highlight the governance of Growth factors during the EMT in cancer invasion.

  1. Nutrition, insulin-like growth factor-1 and retinopathy of prematurity

    Science.gov (United States)

    Hård, Anna-Lena; Smith, Lois E.; Hellström, Ann

    2013-01-01

    SUMMARY Retinopathy of prematurity is a potentially blinding disease starting with impaired retinal vessel growth in the neonatal period. Weeks to months later, peripheral retinal hypoxia induces pathologic neo-vascularization that may lead to retinal detachment and blindness. Current treatment strategies target late stage disease and it would be advantageous if retinopathy of prematurity could be prevented. Poor general growth after very preterm birth is a universal problem associated with increased risk of retinopathy. Loss of the maternal–fetal interaction results not only in loss of nutrients but also of other factors provided in utero. The importance of nutrition and factors such as insulin-like growth factor-1 and ω-3 long chain fatty acids for proper retinal vascularization has been defined in animal studies. Increasing evidence of the applicability of these findings to human infants is accumulating. This review focuses on factors essential for neonatal growth and possible strategies to improve growth and prevent retinopathy. PMID:23428885

  2. Imatinib mesylate attenuates myocardial remodeling through inhibition of platelet-derived growth factor and transforming growth factor activation in a rat model of hypertension.

    Science.gov (United States)

    Jang, Sung-Won; Ihm, Sang-Hyun; Choo, Eun-Ho; Kim, Ok-Ran; Chang, Kiyuk; Park, Chan-Seok; Kim, Hee-Yeol; Seung, Ki-Bae

    2014-06-01

    Imatinib mesylate is a specific tyrosine kinase inhibitor that may block the platelet-derived growth factor and transforming growth factor pathways. These pathways are known to provoke fibroblast activation. We evaluated whether imatinib, by inhibiting these pathways, prevents diastolic dysfunction and attenuates myocardial remodeling using spontaneously hypertensive rats (SHRs). Eight-week-old male SHRs were randomly assigned to either imatinib treatment group (30 mg/kg per day; n=10; SHR-I) or hypertensive control group (distilled water, n=10; SHR-C). Wistar-Kyoto rats were used as normal controls (n=10). At 16 weeks, all rats underwent hemodynamic studies and Doppler echocardiography and then were euthanized. Their hearts were extracted for histopathologic, immunoblotting, and quantitative reverse transcriptase polymerase chain reaction analyses. Although imatinib did not affect blood pressure, it markedly reduced perivascular and interstitial fibrosis in the hearts of SHR. Echocardiogram showed that imatinib significantly reduced the left ventricular wall thickness (septal/posterior wall; SHR-C versus SHR-I, 18±1/19±2 versus 15±1/15±1 mm; Pimatinib significantly reduced the mRNA expression of collagen type I, III, and platelet-derived growth factor receptor-β phosphorylation in the hearts of SHR. In addition, imatinib reduced collagen production by inhibiting the phosphorylation of c-abl and platelet-derived growth factor receptor-β in rat cardiac fibroblasts. In conclusion, these results suggest that imatinib could attenuate myocardial remodeling and improve left ventricular diastolic dysfunction in a hypertensive rat model by affecting platelet-derived growth factor and transforming growth factor-β1 pathway without the blood pressure-lowering effect.

  3. Establishment of a rabbit Oct4 promoter-based EGFP reporter system.

    Directory of Open Access Journals (Sweden)

    Longquan Quan

    Full Text Available Rabbits are commonly used as laboratory animal models to investigate human diseases and phylogenetic development. However, pluripotent stem cells that contribute to germline transmission have yet to be established in rabbits. The transcription factor Oct4, also known as Pou5f1, is considered essential for the maintenance of the pluripotency of stem cells. Hence, pluripotent cells can be identified by monitoring Oct4 expression using a well-established Oct4 promoter-based reporter system. This study developed a rabbit Oct4 promoter-based enhanced green fluorescent protein (EGFP reporter system by transfecting pROP2-EGFP into rabbit fetal fibroblasts (RFFs. The transgenic RFFs were used as donor cells for somatic cell nuclear transfer (SCNT. The EGFP expression was detected in the blastocysts and genital ridges of SCNT fetuses. Fibroblasts and neural stem cells (NSCs were derived from the SCNT fetuses. EGFP was also reactivated in blastocysts after the second SCNT, and induced pluripotent stem cells (iPSCs were obtained after reprogramming using Yamanaka's factors. The results above indicated that a rabbit reporter system used to monitor the differentiating status of cells was successfully developed.

  4. The role of hormones and growth factors in the cellular proliferation control in mammals

    International Nuclear Information System (INIS)

    Armelin, H.A.

    1978-01-01

    A review is done about fibroblast proliferation, its control by classic hormones and hormonal growth factors, showing their main implications and the stage of this research at present. The control exerted on fibronlast proliferation by hormonal growth factors and classic hormones is demonstrated. The existence of basic mechanisms valid for all types of cells is suggested. Experiences are carried out with the aim of finding growth mutants useful in the elucidation of the biochemical mechanisms involved in growth regulation. Radiactive precursors and autoradiographic techniques are used in the research. (M.A.) [pt

  5. Procyanidins Mitigate Osteoarthritis Pathogenesis by, at Least in Part, Suppressing Vascular Endothelial Growth Factor Signaling

    Directory of Open Access Journals (Sweden)

    Angela Wang

    2016-12-01

    Full Text Available Procyanidins are a family of plant metabolites that have been suggested to mitigate osteoarthritis pathogenesis in mice. However, the underlying mechanism is largely unknown. This study aimed to determine whether procyanidins mitigate traumatic injury-induced osteoarthritis (OA disease progression, and whether procyanidins exert a chondroprotective effect by, at least in part, suppressing vascular endothelial growth factor signaling. Procyanidins (extracts from pine bark, orally administered to mice subjected to surgery for destabilization of the medial meniscus, significantly slowed OA disease progression. Real-time polymerase chain reaction revealed that procyanidin treatment reduced expression of vascular endothelial growth factor and effectors in OA pathogenesis that are regulated by vascular endothelial growth factor. Procyanidin-suppressed vascular endothelial growth factor expression was correlated with reduced phosphorylation of vascular endothelial growth factor receptor 2 in human OA primary chondrocytes. Moreover, components of procyanidins, procyanidin B2 and procyanidin B3 exerted effects similar to those of total procyanidins in mitigating the OA-related gene expression profile in the primary culture of human OA chondrocytes in the presence of vascular endothelial growth factor. Together, these findings suggest procyanidins mitigate OA pathogenesis, which is mediated, at least in part, by suppressing vascular endothelial growth factor signaling.

  6. Regulation of endocrine and paracrine sources of insulin-like growth factors and growth hormone receptor during compensatory growth in hybrid striped bass (Morone chrysops x Morone saxatilis)

    DEFF Research Database (Denmark)

    Picha, Matthew E; Turano, Marc J; Tipsmark, Christian K

    2008-01-01

    Compensatory growth (CG) is a period of growth acceleration that exceeds normal rates after animals are alleviated of certain growth-stunting conditions. In hybrid striped bass (HSB, Morone chrysops x M. saxatilis), 3 weeks of complete feed restriction results in a catabolic state that, when...... relieved, renders a subsequent phase of CG. The catabolic state was characterized by depressed levels of hepatic Type I and II GH receptor (Ghr1, Ghr2) and insulin-like growth factor-I (Igf-I) mRNA, along with considerable decreases in plasma IGF-I. The state of catabolism also resulted in significant...... declines in hepatic Igf-II mRNA and in circulating 40kDa IGF binding protein (IGFBP). Skeletal muscle expression of Ghr2 mRNA was significantly increased. Upon realimentation, specific growth rates (SGR) were significantly higher than sized-matched controls, indicating a period of CG. Hepatic Ghr1, Ghr2...

  7. Enhancing hair growth in male androgenetic alopecia by a combination of fractional CO2 laser therapy and hair growth factors.

    Science.gov (United States)

    Huang, Yue; Zhuo, Fenglin; Li, Linfeng

    2017-11-01

    Laser therapy and growth factors have been used as alternative treatments for male androgenetic alopecia (MAA). The aim of this study is to determine the efficacy and safety of hair growth factors alone or combined with ablative carbon dioxide (CO 2 ) fractional laser therapy in MAA. Twenty-eight men were enrolled in this randomized half-split study based on a left-head to right-head pattern. Fractional CO 2 laser treatment was unilaterally performed; hair growth factors were bilaterally applied. Six sessions with 2-week intervals were performed. Global photographs and dermoscopy assessments were performed at the baseline and 4 months after first treatment. Global photographs underwent blinded review by three independent dermatologists. Scanning electron microscopy was used to compare changes in hair-follicle phase and hair-shaft diameter. Twenty-seven participants completed the 4-month treatment schedule. One patient was lost. Mean hair density increased from 114 ± 27 to 143 ± 25/cm 2 (P hair follicles appeared to transition from telogen to anagen, and hair-shaft diameter increased in five randomly selected patients. Ablative fractional CO 2 laser combined with hair growth factors may serve as an alternative treatment for MAA in individuals unwilling/unable to undergo medical or surgical treatment.

  8. The growth factor from plerocercoid larvae of the tapeworm, Spirometra mansonoides, stimulates growth but is not diabetogenic.

    Science.gov (United States)

    Salem, M A; Phares, C K

    1989-06-01

    A factor produced by plerocercoids of the tapeworm Spirometra mansonoides is similar to human growth hormone (hGH) in that it stimulates body growth, binds to hGH receptors, cross-reacts with anti-hGH antibodies, and has lactogenic and insulin-like activities. The purpose of this study was to determine whether plerocercoid growth factor (PGF) is similar to hGH in expressing diabetogenic activity in the genetically obese (ob/ob) mouse. To determine an effective dose for use in the obese mice, the ability of daily injections of PGF to stimulate growth of phenotypically normal mice of the same strain was assessed in a 10-day weight gain assay. Injections of PGF stimulated a dose-dependent weight gain (r = 0.83) and 25 ng eq/day of PGF stimulated a response not significantly different from that produced by 100 micrograms of bovine growth hormone/day. Diabetogenicity was assessed using fasting blood glucose and glucose tolerance tests in obese mice that had been injected for 3 days with saline, hGH, or PGF. Human growth hormone caused a significant increase (P less than 0.005) in fasting blood glucose and glucose tolerance of the obese mice was impaired (P less than 0.01). All of the doses of PGF used to test diabetogenicity in the obese mice were at least twice that required to stimulate a maximal growth response in normal mice, yet none of the doses of PGF increased fasting blood glucose or decreased glucose tolerance. These results show that PGF was a potent growth stimulant but was not diabetogenic.

  9. Growth-supporting activity for Legionella pneumophila in tap water cultures and implication of hartmannellid amoebae as growth factors.

    Science.gov (United States)

    Wadowsky, R M; Butler, L J; Cook, M K; Verma, S M; Paul, M A; Fields, B S; Keleti, G; Sykora, J L; Yee, R B

    1988-11-01

    Photosynthetic cyanobacteria, heterotrophic bacteria, free-living amoebae, and ciliated protozoa may support growth of Legionella pneumophila. Studies were done with two tap water cultures (WS1 and WS2) containing L. pneumophila and associated microbiota to characterize growth-supporting activity and assess the relative importance of the microbiota in supporting multiplication of L. pneumophila. The water cultures were incubated in the dark at 35 degrees C. The growth-supporting factor(s) was separated from each culture by filtration through 1-micron-pore-size membrane filters. The retentate was then suspended in sterile tap water. Multiplication of L. pneumophila occurred when both the retentate suspension and the filtrate from either culture were inoculated into sterile tap water. L. pneumophila did not multiply in tap water inoculated with only the filtrate, even though filtration did not reduce the concentration of L. pneumophila or heterotrophic bacteria in either culture. Growth-supporting activity of the retentate suspension from WS1 was inactivated at 60 degrees C but unaffected at 0, 25, and 45 degrees C after 30-min incubations. Filtration experiments indicated that the growth-supporting factor(s) in WS1 was 2 to 5 micron in diameter. Ciliated protozoa were not detected in either culture. Hartmannellid amoebae were conclusively demonstrated in WS2 but not in WS1. L. pneumophila multiplied in tap water inoculated with the amoebae (10(3)/ml) and the 1-micron filtrate of WS2. No multiplication occurred in tap water inoculated with the filtrate only. Growth-supporting activity for L. pneumophila may be present in plumbing systems; hartmannellid amoebae appear to be important determinants of multiplication of L. pneumophila in some tap water cultures.

  10. Growth factors and chemotactic factors from parasitic helminths: molecular evidence for roles in host-parasite interactions versus parasite development.

    Science.gov (United States)

    Freitas, Tori C; Pearce, Edward J

    2010-06-01

    For decades molecular helminthologists have been interested in identifying proteins expressed by the parasite that have roles in modulating the host immune response. In some cases, the aim was targeting parasite-derived orthologues of mammalian cytokines and growth factors known to have functions in immune modulation. In others, novel proteins without homology to mammalian cytokines were isolated by investigating effects of purified worm extracts on various immunological processes. Often, the role parasite-derived growth factors play in worm development was ignored. Here, we review growth factors and chemotactic factors expressed by parasitic helminths and discuss their recognised and potential roles in immunomodulation and/or parasite development. (c) 2010 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.

  11. p8 inhibits the growth of human pancreatic cancer cells and its expression is induced through pathways involved in growth inhibition and repressed by factors promoting cell growth

    Directory of Open Access Journals (Sweden)

    Vasseur Sophie

    2003-11-01

    Full Text Available Abstract Background p8 is a stress-induced protein with multiple functions and biochemically related to the architectural factor HMG-I/Y. We analyzed the expression and function of p8 in pancreatic cancer-derived cells. Methods Expression of p8 was silenced in the human pancreatic cancer cell lines Panc-1 and BxPc-3 by infection with a retrovirus expressing p8 RNA in the antisense orientation. Cell growth was measured in control and p8-silenced cells. Influence on p8 expression of the induction of intracellular pathways promoting cellular growth or growth arrest was monitored. Results p8-silenced cells grew more rapidly than control cells transfected with the empty retrovirus. Activation of the Ras→Raf→MEK→ERK and JNK intracellular pathways down-regulated p8 expression. In addition, the MEK1/2 inhibitor U0126 and the JNK inhibitor SP600125 up-regulates expression of p8. Conversely, p38 or TGFβ-1 induced p8 expression whereas the specific p38 inhibitor SB203580 down-regulated p8 expression. Finally, TGFβ-1 induction was in part mediated through p38. Conclusions p8 inhibits the growth of human pancreatic cancer cells. p8 expression is induced through pathways involved in growth inhibition and repressed by factors that promote cell growth. These results suggest that p8 belongs to a pathway regulating the growth of pancreatic cancer cells.

  12. Growth factor delivery-based tissue engineering: general approaches and a review of recent developments.

    Science.gov (United States)

    Lee, Kangwon; Silva, Eduardo A; Mooney, David J

    2011-02-06

    The identification and production of recombinant morphogens and growth factors that play key roles in tissue regeneration have generated much enthusiasm and numerous clinical trials, but the results of many of these trials have been largely disappointing. Interestingly, the trials that have shown benefit all contain a common denominator, the presence of a material carrier, suggesting strongly that spatio-temporal control over the location and bioactivity of factors after introduction into the body is crucial to achieve tangible therapeutic effect. Sophisticated materials systems that regulate the biological presentation of growth factors represent an attractive new generation of therapeutic agents for the treatment of a wide variety of diseases. This review provides an overview of growth factor delivery in tissue engineering. Certain fundamental issues and design strategies relevant to the material carriers that are being actively pursued to address specific technical objectives are discussed. Recent progress highlights the importance of materials science and engineering in growth factor delivery approaches to regenerative medicine.

  13. Insulin-like growth factor II: complexity of biosynthesis and receptor binding

    DEFF Research Database (Denmark)

    Gammeltoft, S; Christiansen, Jan; Nielsen, F C

    1991-01-01

    Insulin-like growth factor II (IGF-II) belongs to the insulin family of peptides and acts as a growth factor in many fetal tissues and tumors. The gene expression of IGF-II is initiated at three different promoters which gives rise to multiple transcripts. In a human rhabdomyosarcoma cell line......, Man-6-P induces cellular responses. We have studied rat brain neuronal precursor cells where Man-6-P acted as a mitogen suggesting that phosphomannosylated proteins may act as growth factors via the Man-6-P/IGF-II receptor. In conclusion, the gene expression and mechanism of action of IGF-II is very...

  14. News Related to Future GDP Growth as a Risk Factor in Equity Returns

    OpenAIRE

    Vassalou, Maria

    2001-01-01

    A model that includes a factor that captures news related to future Gross Domestic Product (GDP) growth along with the market factor can explain the cross-section of equity returns about as well as the Fama-French model can. Furthermore, the Fama-French factors HML and SMB appear to contain mainly news related to future GDP growth. When news related to future GDP growth is present in the asset-pricing model, HML and SMB lose their ability to explain the cross-section.

  15. Chitosan conduits combined with nerve growth factor microspheres repair facial nerve defects

    OpenAIRE

    Liu, Huawei; Wen, Weisheng; Hu, Min; Bi, Wenting; Chen, Lijie; Liu, Sanxia; Chen, Peng; Tan, Xinying

    2013-01-01

    Microspheres containing nerve growth factor for sustained release were prepared by a compound method, and implanted into chitosan conduits to repair 10-mm defects on the right buccal branches of the facial nerve in rabbits. In addition, chitosan conduits combined with nerve growth factor or normal saline, as well as autologous nerve, were used as controls. At 90 days post-surgery, the muscular atrophy on the right upper lip was more evident in the nerve growth factor and normal sa-line groups...

  16. Mechanism of divergent growth factor effects in mesenchymal stem cell differentiation

    DEFF Research Database (Denmark)

    Kratchmarova, Irina; Blagoev, Blagoy; Haack-Sorensen, M.

    2005-01-01

    Closely related signals often lead to very different cellular outcomes. We found that the differentiation of human mesenchymal stem cells into bone-forming cells is stimulated by epidermal growth factor (EGF) but not platelet-derived growth factor (PDGF). We used mass spectrometry-based proteomics...... it as a possible control point. Indeed, chemical inhibition of PI3K in PDGF-stimulated cells removed the differential effect of the two growth factors, bestowing full differentiation effect onto PDGF. Thus, quantitative proteomics can directly compare entire signaling networks and discover critical differences...

  17. Modulation of growth factors by growth hormone in children with chronic renal failure. The Southwest Pediatric Nephrology Study Group.

    Science.gov (United States)

    Powell, D R; Liu, F; Baker, B K; Hintz, R L; Lee, P D; Durham, S K; Brewer, E D; Frane, J W; Watkins, S L; Hogg, R J

    1997-06-01

    Anthropometric measurements and circulating growth factors were studied serially in 44 prepubertal children with growth failure and chronic renal failure (GFR = 10 to 40 ml/min/1.73 m2) who were randomized to receive either recombinant human growth hormone (rhGH; N = 30) or no treatment (N = 14). RhGH was given as Nutropin, 0.05 mg/kg/day, and the studies were carried out at baseline and after 3 and 12 months. At baseline, serum insulin-like growth factor binding protein (IGFBP)-1 and -2 levels were, while IGFBP-3 levels were not, higher than those of children with normal renal function. In addition, height SDS at baseline correlated inversely with serum IGFBP-2 levels (r = -0.461, P = 0.0016), but did not correlate significantly with any other factor. After 12 months of study, the 30 children receiving rhGH showed: (i) greater increase in height (9.1 +/- 2.8 vs. 5.5 +/- 1.9 cm, P < 0.0001); (ii) increases in serum levels of IGF-I, IGF-II, free IGF-I, IGFBP-3 and acid labile subunit (ALS); (iii) a greater decrease in serum IGFBP-1 levels; and (iv) no significant difference in serum IGFBP-2 levels, when compared to the 14 control patients. The change in height SDS after 12 months of rhGH (+0.8) in the 30 treated children correlated significantly and positively with serum ALS, IGFBP-3, total IGF, IGF-I, IGF-II and free IGF-I levels measured during treatment. These observations suggest that, in children with growth failure associated with chronic renal failure: (i) IGFBP-2, and not IGFBP-3, is likely to be a growth inhibitor; (ii) rhGH stimulates catch-up growth in part by increasing serum levels of IGF peptides; and (iii) linear growth is influenced by the balance between growth stimulating IGFs and growth inhibitory IGFBPs.

  18. Import Substitution as a Factor of Regional Economic Growth

    Directory of Open Access Journals (Sweden)

    Sukhanova Irina Fedorovna

    2014-11-01

    Full Text Available The current state of import substitution in Russia is considered. The authors’ definition is given to the concept of import substitution. The features of short-term and longterm strategies of import substitution are opened. The authors prove the need of diversification of the directions of foreign economic activity by reorientation of the foreign trade communications of Russia to the markets of the countries of CIS, the customs union and CES as well as the countries of the Asia Pacific region. The reasons of growth of import deliveries of foodstuff are opened. The comparative analysis of food consumption level in Russia is conducted. The food coefficients dependence on the most important food are calculated. The comparative analysis of productive indicators of domestic agricultural production with similar indicators of the foreign states is made. The strategies of import substitution for domestic agriculture taking into account its specifics and production potential, is offered. The assessment of potential of import substitution of Saratov region is presented. The priority actions on ensuring food security and growth of economy of the region are offered.

  19. Insulin-like growth factor 1 and growth hormone in chronic liver disease

    DEFF Research Database (Denmark)

    Møller, Søren; Becker, Povl Ulrik

    1992-01-01

    mainly due to the decreased liver function. Low levels of somatomedins are also seen in patients with growth hormone (GH) insufficiency, renal impairment, and malnutrition. GH stimulates the production of IGF-1, and both are part of a negative feedback system acting on hepatic, pituitary...

  20. Exploring Serum Levels of Brain Derived Neurotrophic Factor and Nerve Growth Factor Across Glaucoma Stages.

    Directory of Open Access Journals (Sweden)

    Francesco Oddone

    Full Text Available To investigate the serum levels of Brain Derived Neurotrophic Factor (BDNF and Nerve Growth Factor (NGF in patients affected by primary open angle glaucoma with a wide spectrum of disease severity compared to healthy controls and to explore their relationship with morphological and functional glaucoma parameters.45 patients affected by glaucoma at different stages and 15 age-matched healthy control subjects underwent visual field testing, peripapillary retinal nerve fibre layer thickness measurement using Spectral Domain Optical Coherence Tomography and blood collection for both neurotrophins detection by Enzyme-Linked Immunosorbent Assay. Statistical analysis and association between biostrumental and biochemical data were investigated.Serum levels of BDNF in glaucoma patients were significantly lower than those measured in healthy controls (261.2±75.0 pg/ml vs 313.6±79.6 pg/ml, p = 0.03. Subgroups analysis showed that serum levels of BDNF were significantly lower in early (253.8±40.7 pg/ml, p = 0.019 and moderate glaucoma (231.3±54.3 pg/ml, p = 0.04 but not in advanced glaucoma (296.2±103.1 pg/ml, p = 0.06 compared to healthy controls. Serum levels of NGF in glaucoma patients were significantly lower than those measured in the healthy controls (4.1±1 pg/mL vs 5.5±1.2 pg/mL, p = 0.01. Subgroups analysis showed that serum levels of NGF were significantly lower in early (3.5±0.9 pg/mL, p = 0.0008 and moderate glaucoma (3.8±0.7 pg/ml, p<0.0001 but not in advanced glaucoma (5.0±0.7 pg/ml, p = 0.32 compared to healthy controls. BDNF serum levels were not related to age, visual field mean deviation or retinal nerve fibre layer thickness either in glaucoma or in controls while NGF levels were significantly related to visual field mean deviation in the glaucoma group (r2 = 0.26, p = 0.004.BDNF and NGF serum levels are reduced in the early and moderate glaucoma stages, suggesting the possibility that both factors could be further investigated

  1. Muscle Atrophy Reversed by Growth Factor Activation of Satellite Cells in a Mouse Muscle Atrophy Model

    DEFF Research Database (Denmark)

    Hauerslev, Simon; Vissing, John; Krag, Thomas O

    2014-01-01

    control factor, myostatin and atrophy markers MAFbx and MuRF1. Hypoxia-induced atrophy was partially restored by hepatocyte growth factor combined with leukemia inhibitory factor treatment. Dividing satellite cells were three-fold increased in the treatment group compared to control. Finally, we...

  2. Hematological and hepatic effects of vascular epidermal growth factor (VEGF) used to stimulate hair growth in an animal model.

    Science.gov (United States)

    Gnann, Laís Angelo; Castro, Rafael Ferreira; Azzalis, Ligia Ajaime; Feder, David; Perazzo, Fabio Ferreira; Pereira, Edimar Cristiano; Rosa, Paulo César Pires; Junqueira, Virginia Berlanga Campos; Rocha, Katya Cristina; Machado, Carlos D' Aparecida; Paschoal, Francisco Camargo; de Abreu, Luiz Carlos; Valenti, Vitor Engrácia; Fonseca, Fernando Luiz Affonso

    2013-10-29

    Alopecia areata is the hair loss usually reversible, in sharply defined areas. The treatment of alopecia using growth factors shows interesting activity in promoting hair growth. In this concept, VEGF (vascular endothelial growth factor) is a marker of angiogenesis, stimulating hair growth by facilitating the supply of nutrients to the hair follicle, increasing follicular diameter. The aim of this study was the evaluation of a topical gel enriched with VEGF liposomes on the hair growth stimulation and its toxicological aspects. Mesocricetus auratus were randomly divided into three groups. Control group was treated with Aristoflex® gel, 1% group with the same gel but added 1% VEGF and 3% group with 3% VEGF. Biochemical, hematological and histological analyses were done. At the end of the experiment (15th day of VEGF treatment) efficacy was determined macroscopically by hair density dermatoscopy analysis, and microscopically by hair diameter analysis. They both demonstrated that hair of the VEGF group increased faster and thicker than control. On the other hand, biochemical and hematological results had shown that VEGF was not 100% inert. VEGF increased hair follicle area, but more studies are necessary to confirm its toxicity.

  3. Morpholino-Mediated Isoform Modulation of Vascular Endothelial Growth Factor Receptor-2 (VEGFR2) Reduces Colon Cancer Xenograft Growth

    Energy Technology Data Exchange (ETDEWEB)

    Stagg, Brian C., E-mail: briancstagg@gmail.com; Uehara, Hironori; Lambert, Nathan; Rai, Ruju; Gupta, Isha; Radmall, Bryce; Bates, Taylor; Ambati, Balamurali K. [John A Moran Eye Center, University of Utah, Salt Lake City, UT, 65 Mario Capecchi Drive, Salt Lake City, UT 84132 (United States)

    2014-11-26

    Angiogenesis plays a key role in tumor growth. Vascular endothelial growth factor (VEGF) is a pro-angiogenic that is involved in tumor angiogenesis. When VEGF binds to membrane-bound vascular endothelial growth factor receptor 2 (mVEGFR2), it promotes angiogenesis. Through alternative polyadenylation, VEGFR2 is also expressed in a soluble form (sVEGFR2). sVEGFR2 sequesters VEGF and is therefore anti-angiogenic. The aim of this study was to show that treatment with a previously developed and reported antisense morpholino oligomer that shifts expression from mVEGFR2 to sVEGFR2 would lead to reduced tumor vascularization and growth in a murine colon cancer xenograft model. Xenografts were generated by implanting human HCT-116 colon cancer cells into the flanks of NMRI nu/nu mice. Treatment with the therapeutic morpholino reduced both tumor growth and tumor vascularization. Because the HCT-116 cells used for the experiments did not express VEGFR2 and because the treatment morpholino targeted mouse rather than human VEGFR2, it is likely that treatment morpholino was acting on the mouse endothelial cells rather than directly on the tumor cells.

  4. Controllable mineral coatings on scaffolds as carriers for growth factor release for bone tissue engineering

    Science.gov (United States)

    Saurez-Gonzalez, Darilis

    The work presented in this document, focused on the development and characterization of mineral coatings on scaffold materials to serve as templates for growth factor binding and release. Mineral coatings were formed using a biomimetic approach that consisted in the incubation of scaffolds in modified simulated body fluids (mSBF). To modulate the properties of the mineral coating, which we hypothesized would dictate growth factor release, we used carbonate (HCO3) concentration in mSBF of 4.2 mM, 25mM, and 100mM. Analysis of the mineral coatings formed using scanning electron microscopy indicated growth of a continuous layer of mineral with different morphologies. X-ray diffraction analysis showed peaks associated with hydroxyapatite. FTIR data confirmed the substitution of HCO3 in the mineral. As the extent of HCO3 substitution increased, the coating exhibited more rapid dissolution kinetics in an environment deficient in calcium and phosphate. The mineral coatings provided an effective mechanism for bioactive growth factor binding and release. Peptide versions of vascular endothelial growth factor (VEGF) and bone morphogenetic protein 2 (BMP2) were bound with efficiencies up to 90% to mineral-coated PCL scaffolds. Recombinant human vascular endothelial growth factor (rhVEGF) also bound to mineral coated scaffolds with lower efficiency (20%) and released with faster release kinetics compared to peptides growth factor. Released rhVEGF induced human umbilical vein endothelial cell (HUVEC) proliferation in vitro and enhanced blood vessel formation in vivo in an intramuscular sheep model. In addition to the use the mineral coatings for single growth factor release, we expanded the concept and bound both an angiogenic (rhVEGF) and osteogenic (mBMP2) growth factor by a simple double dipping process. Sustained release of both growth factors was demonstrated for over 60 days. Released rhVEGF enhanced blood vessel formation in vivo in sheep and its biological activity was

  5. Angiogenic factors stimulate growth of adult neural stem cells.

    Directory of Open Access Journals (Sweden)

    Andreas Androutsellis-Theotokis

    2010-02-01

    Full Text Available The ability to grow a uniform cell type from the adult central nervous system (CNS is valuable for developing cell therapies and new strategies for drug discovery. The adult mammalian brain is a source of neural stem cells (NSC found in both neurogenic and non-neurogenic zones but difficulties in culturing these hinders their use as research tools.Here we show that NSCs can be efficiently grown in adherent cell cultures when angiogenic signals are included in the medium. These signals include both anti-angiogenic factors (the soluble form of the Notch receptor ligand, Dll4 and pro-angiogenic factors (the Tie-2 receptor ligand, Angiopoietin 2. These treatments support the self renewal state of cultured NSCs and expression of the transcription factor Hes3, which also identifies the cancer stem cell population in human tumors. In an organotypic slice model, angiogenic factors maintain vascular structure and increase the density of dopamine neuron processes.We demonstrate new properties of adult NSCs and a method to generate efficient adult NSC cultures from various central nervous system areas. These findings will help establish cellular models relevant to cancer and regeneration.

  6. fibroblast growth factor, MTDH/Astrocyte elevated gene-1

    African Journals Online (AJOL)

    2012-12-05

    Dec 5, 2012 ... Background: The etiopathogenesis of prostate cancer (PC) is still not clear, but hormonal, genetic, and environmental factors are thought to play a role in the tumor pathogenesis. Astrocyte elevated gene-1(AEG-1) as a novel transmembrane protein is predominantly located in the perinuclear region and ...

  7. Factors affecting yeast growth and protein yield production from ...

    African Journals Online (AJOL)

    Agricultural residues rich in carbohydrates can be utilized in fermentation proceses to produce microbial protein which in turn can be used to upgrade both human and animal feeds. Studies to determine the factors influencing cell biomass production with Candida sp. using citrus fruit wastes showed that the test strain was ...

  8. Ethical crossroads: A study of factors impeding professional growth ...

    African Journals Online (AJOL)

    Research on current discourses on educational change in general and teacher education in particular have identified reasons why some teacher education courses fail to connect with trainees. This study sought to investigate factors that underlie pre-service teachers\\' resistance to an innovative religious and moral ...

  9. [Infants of diabetic mothers (IDM). I -- Macrosomia and growth factors].

    Science.gov (United States)

    Martín Carballo, G; Fernández Cano, G; Grande Aragón, C; Méndez Alavedra, J; Hawkins Carranza, F; Gracia Bouthelier, R

    1997-09-01

    The objective of this study was to determine the incidence of macrosomia in infants of diabetic mothers (IDM) and to analyze its possible correlation with insulin, C-peptide, growth hormone (GH) and IGF-I levels in umbilical cord blood. A prospective study of 58 IDM and 58 control newborns (33 males and 25 females in both groups) was carried out. The incidence of macrosomia was 25.8% in the IDM group and 61.5% in the IIDDM group (infant of insulin-dependent diabetic mother) compared to 5% in the control group. There was a positive correlation between maternal Hgb Alc levels in the third trimester of gestation and insulin and C-peptide levels with newborn weight in the IDM group (especially in the IIDDM group). IGF-I levels were positively correlated with newborn weight in both control and IDM groups. There was no correlation between GH and IGF-I levels in any group.

  10. Analysis on the Factors that Determine Sustainable Growth of Small Firms in Namibia

    OpenAIRE

    Asa Romeo Asa; Navneel Shalendra Prasad

    2014-01-01

    The demise rate of small firms every year is high worldwide and mostly these businesses struggle for many years without significant growth. Therefore, this study focused on identifying factors that contribute to the sustainability of growth for small firms in a developing country. Small firms are vital in the development and growth of bottom billion economies and are part of solutions to social problems that Namibia experience, inter alia, high unemployment rate. In developing countries, it i...

  11. Transport Sector CO(2) Emissions Growth in Asia : Underlying Factors and Policy Options

    OpenAIRE

    Timilsina, G. R.; Shrestha, A.

    2009-01-01

    This study analyze the potential factors influencing the growth of transport sector carbon dioxide (CO(2)) emissions in selected Asian countries during the 1980-2005 period by decomposing annual emissions growth into components representing changes in fuel mix, modal shift, per capita gross domestic product (GDP) and population, as well as changes in emission coefficients and transportation energy intensity. We find that changes in per capita GDP, population growth and transportation energy i...

  12. Expression of transforming growth factor-beta (TGF-beta) receptors, TGF-beta 1 and TGF-beta 2 production and autocrine growth control in osteosarcoma cells

    NARCIS (Netherlands)

    Kloen, P.; Jennings, C. L.; Gebhardt, M. C.; Springfield, D. S.; Mankin, H. J.

    1994-01-01

    Transforming growth factor-beta (TGF-beta) is a polypeptide with multiple physiological functions. Isoforms of this growth factor have important roles in control of the cell cycle, in regulation of cell-cell interactions and in growth and development. Malignant transformation has been shown to be

  13. Public health leadership development: factors contributing to growth.

    Science.gov (United States)

    Olson, Linda G

    2013-01-01

    This study compares pre- and posttest Leadership Practices Inventory (LPI-Self) scores for public health leaders who completed the Regional Institute for Health and Environmental Leadership (RIHEL) training program at least 2 years earlier; it seeks to identify factors contributing to changes in practices and overall leadership development for public health and environment leaders. Sixty-seven alumni who completed the yearlong RIHEL program between 1999 and 2002 participated through mailed surveys and phone interviews. The Leadership Practices Inventory, an alumni leadership development survey, and interviews provided evidence for positive change in leadership practices. Alumni experienced significant increases in pre- to post-LPI scores, collaborative leadership practices, and communication skills consistent with those taught in the RIHEL program. Women presented higher Encourage the Heart scores than men. Years of public health service negatively correlated with Total Change scores of LPI. The RIHEL program as a training intervention was credited significantly with changes in leadership practices for alumni studied. Nine influencing factors were identified for leadership development and are embedded in a Leadership Development Influence Model. These include self-awareness, a leadership development framework, and skills important in multiple leadership situations. Confidence was both an encouraging factor and a resulting factor to the increased exemplary leadership practices. Leadership development in public health must include multiple factors to create consistent increases in exemplary leadership practices. While the study focused on the leadership development process itself, RIHEL training was reported as having a positive, significant impact overall in participant leadership development. This study adds research data as a foundation for training content areas of focus. Studies to further test the Leadership Development Influence Model will allow public health

  14. Growth factors in breast milk and their effect on gastrointestinal development.

    Science.gov (United States)

    Oguchi, S; Shinohara, K; Yamashiro, Y; Walker, W A; Sanderson, I R

    1997-01-01

    Breast milk contains various biologically active factors including, hormones, peptide growth factors, and cytokines. Epidermal growth factor (EGF) and insulinlike growth factor-I (IGF-I) are two of the major milk-derived peptide growth factors. Colostrum contains higher levels of these growth factors than mature milk does, and, these factors are relatively resistant to proteolysis and stable in the G-I tract. There are specific receptors found in G-I mucosa. Luminal EGF and IGF-I stimulate growth and development of gastrointestinal tract. Intestinal epithelial Caco-2 cells are a good model for studying physiological roles of exogenous growth factors in the G-I development. Effect of EGF and IGF-I on proliferation, differentiation, and IGF-binding protein (IGFBP) production of intestinal Caco-2 cells were studied. Both EGF and IGF-I increased cell proliferation in dose dependent manner. The number of IGF-I receptors on Caco-2 cells increased after differentiation, in contrast to EGF binding which was reported to decrease. Caco-2 cells produced at least three IGFBPs, namely IGFBP-2, -3, and -4. The profile of these IGFBPs varied with differentiation. Secretion of IGFBP-2 and -3 increased with differentiation, but IGFBP-4 diminished. IGF-I stimulated mainly IGFBP-3 production, while EGF stimulated predominantly IGFBP-4. The effects of IGF-I and EGF on IGFBP secretion diminished with increasing cell differentiation. Thus, the interaction between intestinal epithelial cells and extrinsic growth factors are complex and the stage of differentiation is an important determinant of this phenomenon.

  15. Regulatory mechanism and research progress of connective tissue growth factor in diabetic retinopathy

    Directory of Open Access Journals (Sweden)

    Xi-Da Liang

    2016-04-01

    Full Text Available Diabetic retinopathy is one of the microvascular abnormal diseases. In the late stage of disease progression, the antibody of vascular endothelial growth factor can significantly inhibit the formation of new blood vessels and improve macular edema, which is widely used in clinical. However, the aggravation of pro-fibrotic influence after long-term treated by the medicine also attracts a wide range of attention. Connective tissue growth factor, as an important cytokine in intraocular fibrosis, over expressed after treated by the drug, is considered to be one of the most important factors in the side effect of the drug, and is also a potential therapeutic target. After finishing the current research, the regulation mechanism of connective tissue growth factor, includes two ways, regulation of gene expression and direct binding to other cell factors or receptors. Because of its special four module structure, it has many kinds of cell factor specific binding sites, and its regulation mode is more dependent on the latter, which promotes or inhibits the expression of several important cytokine pathways. In diabetic retinopathy, its expression goes throughout the disease process. The accumulation of connective tissue growth factor plays an important role in promoting the thickening of basement membrane and the formation of new blood vessels in the early stage of the clinical stage and the formation of the new blood vessels. In this paper, the regulatory mechanism of connective tissue growth factor and the research progress of this factor in DR are systematically expounded.

  16. Glycosylation of fibroblast growth factor receptor 4 is a key regulator of fibroblast growth factor 19-mediated down-regulation of cytochrome P450 7A1

    NARCIS (Netherlands)

    Triantis, Vassilis; Saeland, Eirikur; Bijl, Nora; Oude-Elferink, Ronald P.; Jansen, Peter L. M.

    2010-01-01

    De novo bile acid synthesis in the liver needs to be tightly regulated in order to maintain optimal bile flow and prevent cholestasis. In the liver, fibroblast growth factor 19 (FGF19) regulates bile acid synthesis by down-regulating messenger RNA levels of cytochrome P450 7A1 (CYP7A1). FGF19 acts

  17. The human gallbladder secretes fibroblast growth factor 19 into bile: Towards defining the role of fibroblast growth factor 19 in the enterobiliary tract

    NARCIS (Netherlands)

    Zweers, Serge J. L. B.; Booij, Klaske A. C.; Komuta, Mina; Roskams, Tania; Gouma, Dirk J.; Jansen, Peter L. M.; Schaap, Frank G.

    2012-01-01

    Fibroblast growth factor 19 (FGF19) plays a crucial role in the negative feedback regulation of bile salt synthesis. In the postprandial state, activation of ileal farnesoid X receptor (FXR) by bile salts results in transcriptional induction of FGF19 and elevation of circulating FGF19 levels. An

  18. Effects of immune challenge on concentrations of serum insulin-like growth factor-I and growth performance in pigs.

    OpenAIRE

    Hevener, W; Routh, P A; Almond, G W

    1999-01-01

    This study was designed to determine the long-term effects of repeated endotoxin treatment or immunization against human serum albumin on concentrations of serum insulin-like growth factor-I (IGF-I) and other indicators of growth performance in growing pigs. Thirty gilts (38.5 +/- 0.9 kg) were randomly assigned to 5 treatment groups (n = 6 animals/group): 1) lipopolysaccharide injections, 2) lipopolysaccharide pair-fed, 3) human serum albumin immunization, 4) human serum albumin pair-fed, and...

  19. Total factor productivity (TFP) growth agriculture in pakistan: trends in different time horizons

    International Nuclear Information System (INIS)

    Ali, A.; Mushtaq, K.; Ashfaq, M.

    2008-01-01

    The present study estimated total factor productivity (TFP) growth of agriculture sector of Pakistan for the period 1971-2006 by employing Tornqvist-Theil (T-T) index number methodology. Most of the conventional inputs were used in constructing the input index. The output index includes major crops, minor crops, important fruits and vegetables and four categories of livestock products. The study estimated TFP growth rates for different decades. The results showed that TFP growth rate was lowest during the decade of 70s (0.96 percent) and highest during the last six years of the study period (2.86 percent). The decade of 80s and 90s registered TFP growth rate of 2.24 percent and 2.46 percent, respectively. The results also explained that TFP growth contributed about 33 percent to total agricultural output growth during the decade of 70s and this contribution increased up to 83 percent during the last six years of the study period. The contribution of TFP growth to total agricultural output growth was 53 and 81 percent during the decades of 80s and 90s, respectively. The study observed that macro level government policies, institutional factors and weather conditions are the major key factors that influenced TFP growth. (author)

  20. Structure of rat acidic fibroblast growth factor at 1.4 A resolution

    DEFF Research Database (Denmark)

    Kulahin, Nikolaj; Kiselyov, Vladislav; Kochoyan, Artur

    2007-01-01

    Fibroblast growth factors (FGFs) constitute a family of 22 structurally related heparin-binding polypeptides that are involved in the regulation of cell growth, survival, differentiation and migration. Here, a 1.4 A resolution X-ray structure of rat FGF1 is presented. Two molecules are present...

  1. Serum insulin-like growth factor-I and body composition in community dwelling older people

    NARCIS (Netherlands)

    Jakobsdottir, S.; van Nieuwpoort, I.C.; Schaap, L.A.; van Schoor, N.M.; Lips, P.T.A.M.; Drent, M.L.

    2010-01-01

    Objectives The decline in the growth hormoneinsulin-like growth factor-I (GHIGF-I) axis during normal aging might be involved in the changes in body composition associated with increasing age. We conducted a study to investigate serum IGF-I levels across different age categories and a possible

  2. Effect of feed cycling on specific growth rate, condition factor and ...

    African Journals Online (AJOL)

    A study was conducted to evaluate the effect of feed cycling on specific growth rate, condition factor and RNA/DNA ratio of Labeo rohita. Fingerling L. rohita were randomly collected from Qadria Fish Farm and Hatchery, Multan, Pakistan and divided into control, 5 days and 10 days feed cycling groups. Specific growth rate ...

  3. Diagnostic utility of leptin and insulin-like growth factor binding ...

    African Journals Online (AJOL)

    modulate glucose and insulin homeostasis through activation in peripheral tissues [6]. The insulin-like growth factor (IGF) system has a highly conserved function in mammals and plays a critical role in energy metabolism and cell renewal in response to nutrients. IGF pathway is not only involved in cell growth in tissue ...

  4. Preoperative Factors Associated with Infiltrative Histologic Growth Patterns in Extremity Soft Tissue Sarcoma

    Directory of Open Access Journals (Sweden)

    Jong Woong Park

    2017-01-01

    Full Text Available Soft tissue sarcoma (STS with an infiltrative histologic growth pattern, when compared to STS with an expansile pattern, may pose difficulties in local control. Preoperative assessment of the presence of infiltrative histologic growth pattern would be helpful in deciding treatment strategies. A review of 144 patients who underwent surgery for extremity STS was performed. Microscopically, the histologic growth pattern was defined as infiltrative if the penetration of the tumor cells into the surrounding tissue was observed. Possible clinicopathologic factors that might be associated with infiltrative histologic growth pattern were investigated with regard to patient demographics, tumor characteristics, and MRI findings. Of the 144 tumors, 71 (49% showed infiltrative histologic growth pattern. On multivariate analysis, histological subtypes other than liposarcoma (OR = 4.57, p=0.02 and infiltrative border on MRI (OR = 2.48, p=0.01 were independent factors associated with infiltrative histologic growth pattern. Predictive index based on these two factors showed a significant improved accuracy (ROC-AUC = 0.647 for predicting infiltrative histologic growth pattern compared to either factor alone. Our data suggests that liposarcoma histology and tumor border on MRI can predict histologic growth pattern in extremity STS.

  5. Defects in articular cartilage metabolism and early arthritis in fibroblast growth factor receptor 3 deficient mice

    NARCIS (Netherlands)

    Valverde-Franco, G.; Binette, J.S.; Li, W.; Wang, H.; Chai, S.; Laflamme, F.; Tran-Khanh, N.; Quenneville, E.; Meijers, T.; Poole, A.R.; Mort, J.S.; Buschmann, M.D.; Henderson, J.E.

    2006-01-01

    Fibroblast growth factor (FGF) receptor 3 has been identified as a key regulator of endochondral bone development and of post-natal bone metabolism through its action on growth plate chondrocytes and osteoblasts, respectively. It has also been shown to promote chondrogenesis and cartilage production

  6. Transforming growth factor-beta1 induces tumor stroma and reduces tumor infiltrate in cervical cancer

    NARCIS (Netherlands)

    Hazelbag, Suzanne; Gorter, Arko; Kenter, Gemma G.; van den Broek, Lambert; Fleuren, Gertjan

    2002-01-01

    Cervical carcinomas consist of tumor cell nests surrounded by varying amounts of intratumoral stroma containing different quantities and types of immune cells. Besides controlling (epithelial) cell growth, the multifunctional cytokine transforming growth factor-beta(1) (TGF-beta(1)) is involved in

  7. Detection of polymorphism of the insulin-like growth factor-I (IGF-I ...

    African Journals Online (AJOL)

    Molecular genetic selection on individual genes is a promising method to genetically improve economically important traits in chickens. The insulin-like growth factor-I (IGF-I) gene may play important roles in growth of multiple tissues, including muscle cells, cartilage and bone. In the present study, polymorphism of the ...

  8. Data and hypotheses on the role of nerve growth factor and other neurotrophins in psychiatric disorders

    NARCIS (Netherlands)

    Bersani, G; Lannitelli, A; Fiore, M; Angelucci, F; Aloe, L

    Nerve growth factor (NGF) was discovered and characterized for its role on the growth, differentiation and maintenance of specific neurons of the peripheral nervous system. Subsequent studies revealed that NGF is synthesized and released within the central nervous system and exerts a trophic and

  9. Soil-Site Factors Affecting Southern Upland Oak Managment and Growth

    Science.gov (United States)

    John K. Francis

    1980-01-01

    Soil supplies trees with physical support, moisture, oxygen, and nutrients. Amount of moisture most limits tree growth; and soil and topographic factors such as texture and aspect, which influence available soil moisture. are most useful in predicting growth. Equations that include soil and topographic variables can be used to predict site index. Foresters can also...

  10. Factors of Economic growth in KSA An empirical analysis from 2000:2014

    Directory of Open Access Journals (Sweden)

    Hanaa Abdelaty Hasan Esmail

    2015-11-01

    Full Text Available This paper aims to conduct analysis of the impact of Oil Revenue and its relationship with all factors that affect growth in domestic product and also focuses on investment opportunity and economic growth in Saudi Arabia which has made the country an increasingly attractive destination of investment for foreign investors.

  11. Factors of Economic growth in KSA An empirical analysis from 2000:2014

    OpenAIRE

    Hanaa Abdelaty Hasan Esmail

    2015-01-01

    This paper aims to conduct analysis of the impact of Oil Revenue and its relationship with all factors that affect growth in domestic product and also focuses on investment opportunity and economic growth in Saudi Arabia which has made the country an increasingly attractive destination of investment for foreign investors.

  12. Circulating concentrations of insulin-like growth factor-1 in dogs with naturally occurring mitral regurgitation

    DEFF Research Database (Denmark)

    Pedersen, Henrik Duelund; Falk, Bo Torkel; Häggström, Jens

    2005-01-01

    Insulin-like growth factor-1 (IGF-1), which mediates most effects of growth hormone, has effects on cardiac mass and function, and plays an important role in the regulation of vascular tone. In humans, an inverse relationship between degree of heart failure (HF) and circulating IGF-1 concentratio...

  13. Clinical, radiological, and flow-related risk factors for growth of untreated, unruptured intracranial aneurysms

    NARCIS (Netherlands)

    Bor, A. Stijntje E|info:eu-repo/dai/nl/314109080; Tiel Groenestege, Andreas T.; terBrugge, Karel G.; Agid, Ronit; Velthuis, Birgitta K.|info:eu-repo/dai/nl/176956301; Rinkel, Gabriel J E|info:eu-repo/dai/nl/085712000; Wermer, Marieke J H

    2015-01-01

    BACKGROUND AND PURPOSE: Unruptured intracranial aneurysms are frequently followed to monitor aneurysm growth. We studied the yield of follow-up imaging and analyzed risk factors for aneurysm growth. METHODS: We included patients with untreated, unruptured intracranial aneurysms and ≥6 months of

  14. Dealing with Interpretability Issues in Predicting Firm Growth: Factor Analysis Approach

    Directory of Open Access Journals (Sweden)

    Bilandžić Ana

    2016-09-01

    Full Text Available Background: Alongside the theoretical progress made in understanding the factors that influence firm growth, many methodological challenges are yet to be overcome. Authors point to the notion of interpretability of growth prediction models as an important prerequisite for further advancement of the field as well as enhancement of models’ practical values.

  15. Growth hormone is a growth factor for the differentiated pancreatic beta-cell

    DEFF Research Database (Denmark)

    Linde, S; Welinder, B S; Billestrup, N

    1989-01-01

    The regulation of the growth of the pancreatic beta-cell is poorly understood. There are previous indications of a role of GH in the growth and insulin production of the pancreatic islets. In the present study we present evidence for a direct long-term effect of GH on proliferation and insulin...... biosynthesis of pancreatic beta-cells in monolayer culture. In culture medium RPMI 1640 supplemented with 2% normal human serum islets or dissociated islet cells from newborn rats maintained their insulin-producing capacity. When supplemented with 1-1000 ng/ml pituitary or recombinant human GH the islet cells...... was accompanied with a continuous increase in insulin release to the culture medium reaching a 10- 20-fold increase after 2-3 months with a half-maximal effect at about 10 ng/ml human GH. The biosynthesis of (pro)insulin was markedly increased with a normal rate of conversion of proinsulin to insulin...

  16. Reduction of urinary connective tissue growth factor by Losartan in type 1 patients with diabetic nephropathy

    NARCIS (Netherlands)

    Andersen, S; van Nieuwenhoven, FA; Tarnow, L; Rossing, P; Rossing, K; Wieten, L; Goldschmeding, R; Parving, HH

    Background. Connective tissue growth factor (CTGF) is an important profibrotic cytokine implicated in development of diabetic glomerulosclerosis. Urinary CTGF is reported to be significantly increased in patients with diabetic nephropathy. The present study aimed to investigate the short- and long

  17. Agonists of fibroblast growth factor receptor induce neurite outgrowth and survival of cerebellar granule neurons

    DEFF Research Database (Denmark)

    Li, Shizhong; Christensen, Claus; Køhler, Lene B

    2009-01-01

    Fibroblast growth factor receptor (FGFR) signaling is pivotal in the regulation of neurogenesis, neuronal differentiation and survival, and synaptic plasticity both during development and in adulthood. In order to develop low molecular weight agonists of FGFR, seven peptides, termed hexafins...

  18. Skin rejuvenation using cosmetic products containing growth factors, cytokines, and matrikines: a review of the literature

    Directory of Open Access Journals (Sweden)

    Aldag C

    2016-11-01

    Full Text Available Caroline Aldag,1,* Diana Nogueira Teixeira,1,* Phillip S Leventhal2 1Merz Pharmaceuticals GmbH, Frankfurt am Main, Germany; 24Clinics, Paris, France *These authors contributed equally to this work Abstract: Skin aging is primarily due to alterations in the dermal extracellular matrix, especially a decrease in collagen I content, fragmentation of collagen fibrils, and accumulation of amorphous elastin material, also known as elastosis. Growth factors and cytokines are included in several cosmetic products intended for skin rejuvenation because of their ability to promote collagen synthesis. Matrikines and matrikine-like peptides offer the advantage of growth factor-like activities but better skin penetration due to their much smaller molecular size. In this review, we summarize the commercially available products containing growth factors, cytokines, and matrikines for which there is evidence that they promote skin rejuvenation. Keywords: cosmetics, skin, aging, growth factor, cytokine, matrikine

  19. Curative effect of surgery combined with nerve growth factor preparation treatment of acute cerebral hemorrhage

    Directory of Open Access Journals (Sweden)

    Fei Luo

    2017-01-01

    Conclusion: Surgery combined with nerve growth factor preparation treatment of acute cerebral hemorrhage can improve neural nutritional status and reduce nerve injury degree, and it is beneficial to the recovery of neural function.

  20. Evaluating the Factor Structure of the Persian Version of Posttraumatic Growth Inventory in Cancer Patients

    Directory of Open Access Journals (Sweden)

    Mehdi Heidarzadeh, Ph.D., RN

    2017-09-01

    Conclusions: This study revealed that P-PTGI has an acceptable validity and reliability for posttraumatic growth assessment in Iranian cancer patients and its factor structure is similar to that of the original form developed by Tedeschi and Calhoun.

  1. Supramolecular Nanofibers Enhance Growth Factor Signaling by Increasing Lipid Raft Mobility

    Energy Technology Data Exchange (ETDEWEB)

    Newcomb, Christina J.; Sur, Shantanu; Lee, Sungsoo S.; Yu, Jeong Min; Zhou, Yan; Snead, Malcolm L.; Stupp, Samuel I. (NWU); (USC)

    2016-04-12

    The nanostructures of self-assembling biomaterials have been previously designed to tune the release of growth factors in order to optimize biological repair and regeneration. We report here on the discovery that weakly cohesive peptide nanostructures in terms of intermolecular hydrogen bonding, when combined with low concentrations of osteogenic growth factor, enhance both BMP-2 and Wnt mediated signaling in myoblasts and bone marrow stromal cells, respectively. Conversely, analogous nanostructures with enhanced levels of internal hydrogen bonding and cohesion lead to an overall reduction in BMP-2 signaling. We propose that the mechanism for enhanced growth factor signaling by the nanostructures is related to their ability to increase diffusion within membrane lipid rafts. The phenomenon reported here could lead to new nanomedicine strategies to mediate growth factor signaling for translational targets.

  2. Self-assembling peptide amphiphiles and related methods for growth factor delivery

    Science.gov (United States)

    Stupp, Samuel I [Chicago, IL; Donners, Jack J. J. M.; Silva, Gabriel A [Chicago, IL; Behanna, Heather A [Chicago, IL; Anthony, Shawn G [New Stanton, PA

    2009-06-09

    Amphiphilic peptide compounds comprising one or more epitope sequences for binding interaction with one or more corresponding growth factors, micellar assemblies of such compounds and related methods of use.

  3. Factors affecting the growth of bifidobacteria in human milk

    Czech Academy of Sciences Publication Activity Database

    Ročková, Š.; Nevoral, J.; Rada, V.; Maršík, Petr; Sklenář, Jan; Hlinková, A.; Vlková, E.; Marounek, Milan

    2011-01-01

    Roč. 21, č. 7 (2011), s. 504-508 ISSN 0958-6946 R&D Projects: GA ČR GA523/07/0572; GA ČR GD525/08/H060 Institutional research plan: CEZ:AV0Z50380511; CEZ:AV0Z50200510; CEZ:AV0Z50450515 Keywords : OLIGOSACCHARIDES * INFANTS * PREBIOTICS Subject RIV: EC - Immunology Impact factor: 2.401, year: 2011

  4. Discerning environmental factors affecting current tree growth in Central Europe

    Czech Academy of Sciences Publication Activity Database

    Cienciala, E.; Russ, R.; Šantrůčková, H.; Altman, Jan; Kopáček, Jiří; Hůnová, I.; Štěpánek, Petr; Oulehle, Filip; Tumajer, J.; Stähl, G.

    2016-01-01

    Roč. 573, dec (2016), s. 541-554 ISSN 0048-9697 R&D Projects: GA ČR(CZ) GA14-12262S Institutional support: RVO:67179843 ; RVO:67985939 ; RVO:60077344 Keywords : Norway spruce * Environmental change * Drought * N-deposition * Managed forest * Tree increment Subject RIV: EH - Ecology, Behaviour; EF - Botanics (BU-J); GK - Forestry (BC-A) Impact factor: 4.900, year: 2016

  5. Factor analysis and growth prospects of potable water local market

    OpenAIRE

    MEKUSH G. E.; ANTONOVA A. V.; LAVROV A. M.; BUVALTSEVA V. I.

    2016-01-01

    Currently, the clean potable water is globally the restricted economic benefit. In highly urbanized and environmentally unfavorable regions, including the Kemerovo region, development of food plants to fill drinking water is the most promising way to solve the problem of potable water availability. Factors and conditions of the drinking water market formation are studied by integral evaluation of drinking water availability in all municipal districts of the region, using the criteria of avail...

  6. The glial growth factors deficiency and synaptic destabilization hypothesis of schizophrenia

    Directory of Open Access Journals (Sweden)

    Zoega Tomas

    2002-07-01

    Full Text Available Abstract Background A systems approach to understanding the etiology of schizophrenia requires a theory which is able to integrate genetic as well as neurodevelopmental factors. Presentation of the hypothesis Based on a co-localization of loci approach and a large amount of circumstantial evidence, we here propose that a functional deficiency of glial growth factors and of growth factors produced by glial cells are among the distal causes in the genotype-to-phenotype chain leading to the development of schizophrenia. These factors include neuregulin, insulin-like growth factor I, insulin, epidermal growth factor, neurotrophic growth factors, erbB receptors, phosphatidylinositol-3 kinase, growth arrest specific genes, neuritin, tumor necrosis factor alpha, glutamate, NMDA and cholinergic receptors. A genetically and epigenetically determined low baseline of glial growth factor signaling and synaptic strength is expected to increase the vulnerability for additional reductions (e.g., by viruses such as HHV-6 and JC virus infecting glial cells. This should lead to a weakening of the positive feedback loop between the presynaptic neuron and its targets, and below a certain threshold to synaptic destabilization and schizophrenia. Testing the hypothesis Supported by informed conjectures and empirical facts, the hypothesis makes an attractive case for a large number of further investigations. Implications of the hypothesis The hypothesis suggests glial cells as the locus of the genes-environment interactions in schizophrenia, with glial asthenia as an important factor for the genetic liability to the disorder, and an increase of prolactin and/or insulin as possible working mechanisms of traditional and atypical neuroleptic treatments.

  7. Expression of transforming growth factor beta(1), beta(3), and basic fibroblast growth factor in full-thickness skin wounds of equine limbs and thorax.

    Science.gov (United States)

    Theoret, C L; Barber, S M; Moyana, T N; Gordon, J R

    2001-01-01

    To map the expression of transforming growth factor (TGF)-beta(1), TGF-beta(3), and basic fibroblast growth factor (bFGF) in full-thickness skin wounds of the horse. To determine whether their expression differs between limbs and thorax, to understand the pathogenesis of exuberant granulation tissue. Six wounds were created on one lateral metacarpal area and one midthoracic area of each horse. Sequential wound biopsies allowed comparison of the temporal expression of growth factors between limb and thoracic wounds. Four 2- to 4-year-old horses. Wounds were assessed grossly and histologically at 12 and 24 hours, and 2, 5, 10, and 14 days postoperatively. ELISAs were used to measure the growth factor concentrations of homogenates of wound biopsies taken at the same timepoints. TGF-beta(1) peaked at 24 hours in both locations and returned to baseline in thoracic wounds by 14 days but remained elevated in limb wounds for the duration of the study. Expression kinetics of TGF-beta(3) differed from those of TGF-beta(1). TGF-beta(3) concentrations gradually increased over time, showing a trend toward an earlier and higher peak in thoracic compared with limb wounds. bFGF expression kinetics resembled those of TGF-beta(1), but no statistically significant differences existed between limb and thoracic wounds. Growth factor expression is up-regulated during normal equine wound repair. TGF-beta(1) and TGF-beta(3) show a reciprocal temporal regulation. Statistically significant differences exist between limb and thoracic wounds with respect to TGF-beta(1) expression. The persistence of TGF-beta(1) expression in leg wounds may be related to the development of exuberant granulation tissue in this location, because TGF-beta(1) is profibrotic. Copyright 2001 by The American College of Veterinary Surgeons

  8. Franchised fast food brands: An empirical study of factors influencing growth

    OpenAIRE

    Christopher A. Wingrove; Boris Urban

    2017-01-01

    Orientation: Franchising is a popular and multifaceted business arrangement that captures a sizeable portion of the restaurant industry worldwide. Research purpose: The study empirically investigated the influence of various site location and branding factors on the growth of franchised fast food restaurant brands across the greater Gauteng region. Motivation of the study: Researching which factors influence the growth of franchised fast food restaurant brands is important for an emer...

  9. Influence of root canal disinfectants on growth factor release from dentin.

    Science.gov (United States)

    Galler, Kerstin M; Buchalla, Wolfgang; Hiller, Karl-Anton; Federlin, Marianne; Eidt, Andreas; Schiefersteiner, Mona; Schmalz, Gottfried

    2015-03-01

    During dentinogenesis, growth factors become entrapped in the dentin matrix that can later be released by demineralization. Their effect on pulpal stem cell migration, proliferation, and differentiation could be beneficial for regenerative endodontic therapies. However, precondition for success, as for conventional root canal treatment, will be sufficient disinfection of the root canal system. Various irrigation solutions and intracanal dressings are available for clinical use. The aim of this study was 2-fold: to identify a demineralizing solution suitable for growth factor release directly from dentin and to evaluate whether commonly used disinfectants for endodontic treatment will compromise this effect. Dentin disks were prepared from extracted human teeth and treated with EDTA or citric acid at different concentrations or pH for different exposure periods. The amount of transforming growth factor-β1 (TGF-β1), fibroblast growth factor 2, and vascular endothelial growth factor were quantified via enzyme-linked immunosorbent assay and visualized by gold labeling. Subsequently, different irrigation solutions (5.25% sodium hypochloride, 0.12% chlorhexidine digluconate) and intracanal dressings (corticoid-antibiotic paste, calcium hydroxide: water-based and oil-based, triple antibiotic paste, chlorhexidine gel) were tested, and the release of TGF-β1 was measured after a subsequent conditioning step with EDTA. Conditioning with 10% EDTA at pH 7 rendered the highest amounts of TGF-β1 among all test solutions. Fibroblast growth factor 2 and vascular endothelial growth factor were detected after EDTA conditioning at minute concentrations. Irrigation with chlorhexidine before EDTA conditioning increased TGF-β1 release; sodium hypochloride had the opposite effect. All tested intracanal dressings interfered with TGF-β1 release except water-based calcium hydroxide. Growth factors can be released directly from dentin via EDTA conditioning. The use of disinfecting

  10. Chronic systemic treatment with epidermal growth factor induces hypergastrinaemia in Goettingen minipigs

    DEFF Research Database (Denmark)

    Vinter-Jensen, Lars; Juhl, C O; Rehfeld, J F

    1995-01-01

    Epidermal growth factor (EGF) is an inhibitor of gastric acid secretion. The impact of chronic systemic treatment with EGF on intragastric pH and serum gastrin concentrations has not been investigated previously.......Epidermal growth factor (EGF) is an inhibitor of gastric acid secretion. The impact of chronic systemic treatment with EGF on intragastric pH and serum gastrin concentrations has not been investigated previously....

  11. The effect of growth factors on the osseointegration of dental implants

    OpenAIRE

    Magalhães, Helena Margarida Assis

    2017-01-01

    Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2017 Introduction: Dental implants have been an option of treatment commonly used in dentistry. Osseointegration is a measure of implant stability and can be enhanced by increasing the contact of bone to implant. Many strategies such as osteogenic coatings with growth factors have been studied in order to achieve it. Objective: To evaluate the effect of growth factors coating dental implants on the...

  12. Chromosomal aberrations as etiological factors of intrauterine growth retardation

    Directory of Open Access Journals (Sweden)

    Petrović Bojana

    2008-01-01

    Full Text Available Background/Aim. Intrauterine growth retardation (IUGR is a pathological condition of pregnancy characterised by birth weight below the 10th centile. A number of fetal, placental and maternal causes can lead to IUGR; although, in most cases no specific causes can be identified. The aim of this study was to determine the part of chromosomal abnormalities in IUGR etiology. Methods. Fetal blood karyotype taken by cordocentesis from 168 fetuses with diagnosed IUGR was analyzed. Results. Chromosomal rearrangements both numerical and structural were detected in 14 cases (12.2%. Two cases were triploid. Patau syndrome, Edwards syndrome and Down syndrome were found in two cases each. There was one case of trisomy 7 (47, XY, +7 and one case of trisomy 16 (47, XX, +16; one translocation, 46, XY, t (2; 14(q23; q32 and a deletion 46, XYdel (12 (p12 as well as two cases of sex chromosomes abnormalities, 45, X (Turner syndrome and 47, XYY. Conclusion. These findings suggest that a consistent number of symmetrical IUGR cases (about 12% can be associated with chromosomal rearrangements. Chromosomal aberrations that cause IUGR are heterogeneous, aberration of autosomes, mostly autosomal trisomies, being the most common.

  13. HCG variants, the growth factors which drive human malignancies

    Science.gov (United States)

    Cole, Laurence A

    2012-01-01

    The term human chorionic gonadotropin (hCG) refers to a group of 5 molecules, each sharing the common amino acid sequence but each differing in meric structure and carbohydrate side chain structure. The 5 molecules are each produced by separate cells and each having separate biological functions. hCG and sulfated hCG are hormones produced by placental syncytiotrophoblast cells and pituitary gonadotrope cells. Hyperglycosylated hCG is an autocrine produced by placental cytotrophoblast cells. Hyperglycosylated hCG drives malignancy in placental cancers, and in testicular and ovarian germ cell malignancies. hCGβ and hyperglycosylated hCGβ are autocrines produce by most advanced malignancies. These molecules, particularly the malignancy promoters are presented in this review on hCG and cancer. hCGβ and hyperglycosylated hCGβ are critical to the growth and invasion, or malignancy of most advanced cancers. In many ways, while hCG may appear like a nothing, a hormone associated with pregnancy, it is not, and may be at the center of cancer research. PMID:22206043

  14. Epidermal growth factor receptor structural alterations in gastric cancer

    International Nuclear Information System (INIS)

    Moutinho, Cátia; Mateus, Ana R; Milanezi, Fernanda; Carneiro, Fátima; Seruca, Raquel; Suriano, Gianpaolo

    2008-01-01

    EGFR overexpression has been described in many human tumours including gastric cancer. In NSCLC patients somatic EGFR mutations, within the kinase domain of the protein, as well as gene amplification were associated with a good clinical response to EGFR inhibitors. In gastric tumours data concerning structural alterations of EGFR remains controversial. Given its possible therapeutic relevance, we aimed to determine the frequency and type of structural alterations of the EGFR gene in a series of primary gastric carcinomas. Direct sequencing of the kinase domain of the EGFR gene was performed in a series of 77 primary gastric carcinomas. FISH analysis was performed in 30 cases. Association studies between EGFR alterations and the clinical pathological features of the tumours were performed. Within the 77 primary gastric carcinomas we found two EGFR somatic mutations and several EGFR polymorphisms in exon 20. Six different intronic sequence variants of EGFR were also found. Four gastric carcinomas showed balanced polysomy or EGFR gene amplification. We verified that gastric carcinoma with alterations of EGFR (somatic mutations or copy number variation) showed a significant increase of tumour size (p = 0.0094) in comparison to wild-type EGFR carcinomas. We demonstrate that EGFR structural alterations are rare in gastric carcinoma, but whenever present, it leads to tumour growth. We considered that searching for EGFR alterations in gastric cancer is likely to be clinically important in order to identify patients susceptible to respond to tyrosine kinase inhibitors

  15. Serum insulin-like growth factor-I (IGF-I) and growth in children born after assisted reproduction

    DEFF Research Database (Denmark)

    Kai, Claudia Mau; Main, Katharina M; Andersen, Anders Nyboe

    2006-01-01

    cohorts was normal. Our findings of subtle differences in target height attainment and serum IGF-I levels between infants born after assisted reproduction techniques and controls may not be clinically significant. However, these observations indicate that further systematic follow-up of growth and puberty......CONTEXT: Concern has been raised about the safety of assisted reproduction techniques for the offspring. OBJECTIVES: The objective of the study was to investigate postnatal growth and growth factors in children born after intra-cytoplasmatic sperm injection (ICSI) and in vitro fertilization (IVF......). DESIGN: The study had two cohorts: a population-based longitudinal infant cohort 0-36 months [236 ICSI, 173 IVF, 1530 naturally conceived (NC)], and a cross-sectional child cohort at 5 yr (68 ICSI, 67 IVF, 70 NC). INTERVENTION: Anthropometrical measurements were made at birth, 3, 18, 36 (infant cohort...

  16. Growth factor-functionalized silk membranes support wound healing in vitro.

    Science.gov (United States)

    Bienert, M; Hoss, M; Bartneck, M; Weinandy, S; Böbel, M; Jockenhövel, S; Knüchel, R; Pottbacker, K; Wöltje, M; Jahnen-Dechent, W; Neuss, S

    2017-08-16

    Chronic wounds represent a serious problem in daily medical routine requiring improved wound care. Silk of the domesticated silkworm (Bombyx mori) has been used to form a variety of biomaterials for medical applications. We genetically engineered B. mori to produce silk functionalized with growth factors to promote wound healing in vitro. In this study FGF-, EGF-, KGF-, PDGF- or VEGF-functionalized silk membranes were compared to native B. mori silk membranes without growth factors for their ability to support wound healing in vitro. All silk membranes were cytocompatible and supported macrophage secretion of neutrophil recruiting factor CXCL1 and monocyte chemoattractant protein 1 (MCP-1). VEGF-functionalized silk significantly outperformed other growth factor-functionalized silk membranes, but not native silk in angiogenesis assays. In addition, EGF- and VEGF-functionalized silk membranes slightly enhanced macrophage adhesion compared to silk without growth factors. In wound healing assays in vitro (reduction of wound lesion), dermal equivalents showed a higher wound healing capacity when covered with EGF-, FGF- or VEGF-functionalized silk membranes compared to native, KGF- or PDGF-functionalized silk membranes. Keratinocyte migration and growth is overstimulated by KGF- and VEGF-functionalized silk membranes. In conclusion, growth factor-functionalized silk membranes prepared from genetically engineered silk worm glands are promising wound dressings for future wound healing therapies.

  17. Growth Factor Identity Is Encoded by Discrete Coiled-Coil Rotamers in the EGFR Juxtamembrane Region.

    Science.gov (United States)

    Doerner, Amy; Scheck, Rebecca; Schepartz, Alanna

    2015-06-18

    Binding of transforming growth factor α (TGF-α) to the epidermal growth factor receptor (EGFR) extracellular domain is encoded through the formation of a unique antiparallel coiled coil within the juxtamembrane segment. This new coiled coil is an "inside-out" version of the coiled coil formed in the presence of epidermal growth factor (EGF). A third, intermediary coiled-coil interface is formed in the juxtamembrane region when EGFR is stimulated with betacellulin. The seven growth factors that activate EGFR in mammalian systems (EGF, TGF-α, epigen, epiregulin, betacellulin, heparin-binding EGF, and amphiregulin) fall into distinct categories in which the structure of the coiled coil induced within the juxtamembrane region correlates with cell state. The observation that coiled-coil state tracks with the downstream signaling profiles for each ligand provides evidence for growth factor functional selectivity by EGFR. Encoding growth factor identity in alternative coiled-coil rotamers provides a simple and elegant method for communicating chemical information across the plasma membrane. Copyright © 2015 Elsevier Ltd. All rights reserved.

  18. Early diet, insulin-like growth factor-1, growth and later obesity

    DEFF Research Database (Denmark)

    Michaelsen, Kim F; Larnkjær, Anni; Mølgaard, Christian

    2013-01-01

    There is increasing evidence that factors in early life are important for the risk of developing overweight and obesity later in childhood. Among the postnatal factors, breastfeeding and complementary feeding are especially interesting because the pattern of these two factors can be changed...... the complementary feeding period does not seem to be a risk factor for later obesity. Thus, the dietary pattern during this period is different from the pattern seen in older children and adults where a high fat intake is associated with a higher risk of obesity and a high protein intake in some studies seems....... Breastfeeding has been shown to reduce the risk of later obesity, although the effect is not substantial. Complementary feeding also seems to play a role. There is some evidence that a high protein intake is associated with a higher risk of obesity later in childhood, whereas a high fat intake during...

  19. Recombinant vascular endothelial growth factor 121 injection for the prevention of fetal growth restriction in a preeclampsia mouse model.

    Science.gov (United States)

    Sulistyowati, Sri; Bachnas, Muhammad Adrianes; Anggraini, Nuri Dyah; Yuliantara, Eric Edwin; Prabowo, Wisnu; Anggraini, Nutria Widya Purna; Pramono, Mochammad Besari Adi; Adityawarman; Dachlan, Erry Gumilar; Andonotopo, Wiku

    2017-02-01

    To discover the potential role of recombinant VEGF121 (rVEGF121) injection for the prevention of fetal growth restriction in a preeclampsia (PE) mouse model (Mus musculus). This is an experimental study of 30 pregnant mice that were randomly divided into three groups: normal, PE, and PE with rVEGF121 injection. The PE mouse model was created by injecting anti Qa-2 10 ng iv, which is deleterious to Qa-2 expression (homologous to HLA-G), from the first to the fourth day of gestation. PE was validated by measuring serum levels of soluble fms-like tyrosine kinase-1 (sFlt-1) and placental growth factor(PIGF) and also by kidney histopathology. Recombinant VEGF121 was given on the ninth day until the 11th day of pregnancy; mice were terminated on the 16th day. Fetal weights were acquired with a Denver analytical balance. Serum levels of sFlt-1 and PlGF were measured using enzyme-linked immunosorbent assay (ELISA). The data were statistically analyzed via analysis of variance (ANOVA). On average, fetal birth weight was 0.7150 g in the normal group, 0.4936 g in the PE group, and 0.6768 g in the PE with rVEGF121 injection group. ANOVA showed significant growth restriction in the PE group (P=0.006), confirming the use of anti Qa-2 as a suitable PE model. Kidney histopathology results, sFlt-1 levels, and PlGF levels also demonstrated that anti Qa-2 consistently conferred hallmarks of PE in mice. Vascular endothelial growth factor (VEGF) injection prevented fetal growth restriction; comparable fetal weights were observed between the PE model with VEGF treatment and the normal group (P=0.610) but differed from the untreated PE group (P=0.021). Injection of rVEGF121 has the potential to prevent fetal growth restriction in a newly proposed PE mouse model.

  20. Collagen and Stretch Modulate Autocrine Secretion of Insulin-like Growth Factor-1 and Insulin-like Growth Factor Binding Proteins from Differentiated Skeletal Muscle Cells

    Science.gov (United States)

    Perrone, Carmen E.; Fenwick-Smith, Daniela; Vandenburgh, Herman H.

    1995-01-01

    Stretch-induced skeletal muscle growth may involve increased autocrine secretion of insulin-like growth factor-1 (IGF-1) since IGF-1 is a potent growth factor for skeletal muscle hypertrophy, and stretch elevates IGF-1 mRNA levels in vivo. In tissue cultures of differentiated avian pectoralis skeletal muscle cells, nanomolar concentrations of exogenous IGF-1 stimulated growth in mechanically stretched but not static cultures. These cultures released up to 100 pg of endogenously produced IGF-1/micro-g of protein/day, as well as three major IGF binding proteins of 31, 36, and 43 kilodaltons (kDa). IGF-1 was secreted from both myofibers and fibroblasts coexisting in the muscle cultures. Repetitive stretch/relaxation of the differentiated skeletal muscle cells stimulated the acute release of IGF-1 during the first 4 h after initiating mechanical activity, but caused no increase in the long-term secretion over 24-72 h of IGF-1, or its binding proteins. Varying the intensity and frequency of stretch had no effect on the long-term efflux of IGF-1. In contrast to stretch, embedding the differentiated muscle cells in a three-dimensional collagen (Type I) matrix resulted in a 2-5-fold increase in long-term IGF-1 efflux over 24-72 h. Collagen also caused a 2-5-fold increase in the release of the IGF binding proteins. Thus, both the extracellular matrix protein type I collagen and stretch stimulate the autocrine secretion of IGF-1, but with different time kinetics. This endogenously produced growth factor may be important for the growth response of skeletal myofibers to both types of external stimuli.

  1. Histamine-stimulated expression of insulin-like growth factors in human glioma cells.

    OpenAIRE

    Van der Ven, L. T.; Van Buul-Offers, S. C.; Gloudemans, T.; Roholl, P. J.; Sussenbach, J. S.; Den Otter, W.

    1997-01-01

    Glioma tumour growth is associated with the expression of insulin-like growth factors I and II (IGFs) and of both type I and type II IGF receptors. It has also been shown that IGFs can stimulate proliferation of cultured glioma cells. We previously reported that histamine too can stimulate the growth of glioma cells in vitro. In this report, we study whether the histamine-induced growth of G47 glioma cells is mediated by the IGFs. We found that histamine stimulates the expression of both IGF-...

  2. Transforming Growth Factor Beta Family: Insight into the Role of Growth Factors in Regulation of Fracture Healing Biology and Potential Clinical Applications

    Directory of Open Access Journals (Sweden)

    Łukasz A. Poniatowski

    2015-01-01

    Full Text Available The transforming growth factor beta (TGF-β family forms a group of three isoforms, TGF-β1, TGF-β2, and TGF-β3, with their structure formed by interrelated dimeric polypeptide chains. Pleiotropic and redundant functions of the TGF-β family concern control of numerous aspects and effects of cell functions, including proliferation, differentiation, and migration, in all tissues of the human body. Amongst many cytokines and growth factors, the TGF-β family is considered a group playing one of numerous key roles in control of physiological phenomena concerning maintenance of metabolic homeostasis in the bone tissue. By breaking the continuity of bone tissue, a spread-over-time and complex bone healing process is initiated, considered a recapitulation of embryonic intracartilaginous ossification. This process is a cascade of local and systemic phenomena spread over time, involving whole cell lineages and various cytokines and growth factors. Numerous in vivo and in vitro studies in various models analysing cytokines and growth factors’ involvement have shown that TGF-β has a leading role in the fracture healing process. This paper sums up current knowledge on the basis of available literature concerning the role of the TGF-β family in the fracture healing process.

  3. Klotho and the Growth Hormone/Insulin-Like Growth Factor 1 Axis: Novel Insights into Complex Interactions.

    Science.gov (United States)

    Rubinek, T; Modan-Moses, D

    2016-01-01

    The growth hormone (GH)/insulin-like growth factor (IGF)-1 axis is pivotal for many metabolic functions, including proper development and growth of bones, skeletal muscles, and adipose tissue. Defects in the axis' activity during childhood result in growth abnormalities, while increased secretion of GH from the pituitary results in acromegaly. In order to keep narrow physiologic concentration, GH and IGF-1 secretion and activity are tightly regulated by hypothalamic, pituitary, endocrine, paracrine, and autocrine factors. Klotho was first discovered as an aging-suppressor gene. Mice that do not express klotho die prematurely with multiple symptoms of aging, several of them are also characteristic of decreased GH/IGF-1 axis activity. Klotho is highly expressed in the brain, the kidney, and parathyroid and pituitary glands, but can also serve as a circulating hormone by its shedding, forming soluble klotho that can be detected in blood, cerebrospinal fluid, and urine. Several lines of evidence suggest an association between klotho levels and activity of the GH/IGF-1 axis: the GH-secreting cells in the anterior pituitary of klotho-deficient mice are hypotrophic; klotho levels are altered in subjects with pathologies of the GH/IGF-1 axis; and accumulating data indicate that klotho is a direct regulator of GH secretion. Thus, klotho seems to be a new player in the intricate regulation of the GH/IGF-1 axis. © 2016 Elsevier Inc. All rights reserved.

  4. Interplay between pro-inflammatory cytokines and growth factors in depressive illnesses

    Directory of Open Access Journals (Sweden)

    Marie-Claude eAudet

    2013-05-01

    Full Text Available The development of depressive disorders had long been attributed to monoamine variations, and pharmacological treatment strategies likewise focused on methods of altering monoamine availability. However, the limited success achieved by treatments that altered these processes spurred the search for alternative mechanisms and treatments. Here we provide a brief overview concerning a possible role for pro-inflammatory cytokines and growth factors in major depression, as well as the possibility of targeting these factors in treating this disorder. The data suggest that focusing on one or another cytokine or growth factor might be counterproductive, especially as these factors may act sequentially or in parallel in affecting depressive disorders. It is also suggested that cytokines and growth factors might be useful biomarkers for individualized treatments of depressive illnesses.

  5. Dihydrotestosterone inhibits hair growth in mice by inhibiting insulin-like growth factor-I production in dermal papillae.

    Science.gov (United States)

    Zhao, Juan; Harada, Naoaki; Okajima, Kenji

    2011-10-01

    We demonstrated that insulin-like growth factor-I (IGF-I) production in dermal papillae was increased and hair growth was promoted after sensory neuron stimulation in mice. Although the androgen metabolite dihydrotestosterone (DHT) inhibits hair growth by negatively modulating growth-regulatory effects of dermal papillae, relationship between androgen metabolism and IGF-I production in dermal papillae is not fully understood. We examined whether DHT inhibits IGF-I production by inhibiting sensory neuron stimulation, thereby preventing hair growth in mice. Effect of DHT on sensory neuron stimulation was examined using cultured dorsal root ganglion (DRG) neurons isolated from mice. DHT inhibits calcitonin gene-related peptide (CGRP) release from cultured DRG neurons. The non-steroidal androgen-receptor antagonist flutamide reversed DHT-induced inhibition of CGRP release. Dermal levels of IGF-I and IGF-I mRNA, and the number of IGF-I-positive fibroblasts around hair follicles were increased at 6h after CGRP administration. DHT administration for 3weeks decreased dermal levels of CGRP, IGF-I, and IGF-I mRNA in mice. Immunohistochemical expression of IGF-I and the number of proliferating cells in hair follicles were decreased and hair re-growth was inhibited in animals administered DHT. Co-administration of flutamide and CGRP reversed these changes induced by DHT administration. These observations suggest that DHT may decrease IGF-I production in dermal papillae by inhibiting sensory neuron stimulation through interaction with the androgen receptor, thereby inhibiting hair growth in mice. Copyright © 2011 Elsevier Ltd. All rights reserved.

  6. Facile modification of gelatin-based microcarriers with multiporous surface and proliferative growth factors delivery to enhance cell growth

    International Nuclear Information System (INIS)

    Huang Sha; Wang Yijuan; Deng, Tianzheng; Jin Fang; Liu Shouxin; Zhang Yongjie; Feng Feng; Jin Yan

    2008-01-01

    The design of microcarriers plays an important role in the success of cell expansion. The present article provides a facile approach to modify the gelatin-based particles and investigates the feasibility of their acting as microcarriers for cell attachment and growth. Gelatin particles (150-320 μm) were modified by cryogenic treatment and lyophilization to develop the surface with the features of multiporous morphology and were incorporated with proliferative growth factors (bFGF) by adsorption during the post-preparation, which enables them to serve as microcarriers for cells amplification, together with the advantages of larger cell-surface contact area and capability of promoting cell propagation. The microstructure and release assay of the modified microcarriers demonstrated that the pores on surface were uniform and bFGF was released in a controlled manner. Through in vitro fibroblast culture, these features resulted in a prominent increase in the cell attachment rate and cell growth rate relative to the conditions without modification. Although the scanning electron microscopy and optical microscopy analysis results indicated that cells attached, spread, and proliferated on all the microcarriers, cell growth clearly showed a significant correlation with the multiporous structure of microcarriers, in particular on bFGF combined ones. These results validate our previous assumption that the facile modification could improve cell growth on the gelatin-based microcarriers obviously and the novel microcarriers may be a promising candidate in tissue engineering

  7. Epidermal growth factor and active caspase-3 expression in the levator ani muscle of dogs with and without perineal hernia.

    Science.gov (United States)

    Pérez-Gutiérrez, J F; Argüelles, J C; Iglesias-Núñez, M; Oliveira, K S; De La Muela, M Sánchez

    2011-07-01

    To perform a histological and immunohistochemical study of epidermal growth factor, transforming growth factor-alpha and their receptor, as well as the apoptotic signal active caspase-3 in the levator ani muscle of dogs with and without perineal hernia. Biopsy specimens of the levator ani muscle were obtained from 25 dogs with perineal hernia and 4 non-affected dogs and were processed for Masson and immunohistochemical staining. The affected dogs exhibited myopathological features, internalised nuclei, destruction and abnormal size of muscle fibres, which were replaced by collagen. The immunohistochemical study revealed active caspase-3, epidermal growth factor, transforming growth factor-alpha and epidermal growth factor receptor in the levator ani. Compared to the healthy muscle, transforming growth factor-alpha staining intensity was lower in the affected muscle, whereas epidermal growth factor receptor and active caspase-3 staining were higher. Pelvic diaphragm muscle weakening is the leading cause of perineal hernia in the dog. Survival and death signals expressed in these muscles may contribute to the pathogenesis of this disease. This study reports epidermal growth factor, transforming growth factor-alpha and epidermal growth factor receptor immunohistochemical expression in the skeletal muscle and suggests that perineal hernia in the dog is accompanied by levator ani muscle atrophy, increased expression of epidermal growth factor receptor, caspase-3 activation, and decreased expression of transforming growth factor-alpha. © 2011 British Small Animal Veterinary Association.

  8. Molecular analysis of expansion, differentiation, and growth factor treatment of human chondrocytes identifies differentiation markers and growth-related genes.

    Science.gov (United States)

    Benz, Karin; Breit, Stephen; Lukoschek, Martin; Mau, Hans; Richter, Wiltrud

    2002-04-26

    This study is intended to optimise expansion and differentiation of cultured human chondrocytes by growth factor application and to identify molecular markers to monitor their differentiation state. We dissected the molecular consequences of matrix release, monolayer, and 3D-alginate culture, growth factor optimised expansion, and re-differentiation protocols by gene expression analysis. Among 19 common cartilage molecules assessed by cDNA array, six proved best to monitor differentiation. Instant down-regulation at release of cells from the matrix was strongest for COL 2A1, fibromodulin, and PRELP while LUM, CHI3L1, and CHI3L2 were expansion-related. Both gene sets reflected the physiologic effects of the most potent growth-inducing (PDGF-BB) and proteoglycan-inducing (BMP-4) factors. Only CRTAC1 expression correlated with 2D/3D switches while the molecular phenotype of native chondrocytes was not restored. The markers and optimised protocols we suggest can help to improve cell therapy of cartilage defects and chondrocyte differentiation from stem cell sources.

  9. Release of Growth Factors into Root Canal by Irrigations in Regenerative Endodontics.

    Science.gov (United States)

    Zeng, Qian; Nguyen, Sean; Zhang, Hongming; Chebrolu, Hari Priya; Alzebdeh, Dalia; Badi, Mustafa A; Kim, Jong Ryul; Ling, Junqi; Yang, Maobin

    2016-12-01

    The aim of this study was to investigate the release of growth factors into root canal space after the irrigation procedure of regenerative endodontic procedure. Sixty standardized root segments were prepared from extracted single-root teeth. Nail varnish was applied to all surfaces except the root canal surface. Root segments were irrigated with 1.5% NaOCl + 17% EDTA, 2.5% NaOCl + 17% EDTA, 17% EDTA, or deionized water. The profile of growth factors that were released after irrigation was studied by growth factor array. Enzyme-linked immunosorbent assay was used to validate the release of transforming growth factor (TGF)-β1 and basic fibroblast growth factor (bFGF) at 4 hours, 1 day, and 3 days after irrigation. The final concentrations were calculated on the basis of the root canal volume measured by cone-beam computed tomography. Dental pulp stem cell migration on growth factors released from root segments was measured by using Transwell assay. Total of 11 of 41 growth factors were detected by growth factors array. Enzyme-linked immunosorbent assay showed that TGF-β1 was released in all irrigation groups. Compared with the group with 17% EDTA (6.92 ± 4.49 ng/mL), the groups with 1.5% NaOCl + 17% EDTA and 2.5% NaOCl + 17% EDTA had significantly higher release of TGF-β1 (69.04 ± 30.41 ng/mL and 59.26 ± 3.37 ng/mL, respectively), with a peak release at day 1. The release of bFGF was detected at a low level in all groups (0 ng/mL to 0.43 ± 0.22 ng/mL). Migration assay showed the growth factors released from root segments induced dental pulp stem cell migration. The root segment model in present study simulated clinical scenario and indicated that the current irrigation protocol released a significant amount of TGF-β1 but not bFGF. The growth factors released into root canal space induced dental pulp stem cell migration. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  10. Correlation of Serum Insulin-like Growth Factor 1 with Prostate Cancer

    Directory of Open Access Journals (Sweden)

    Mohsen Ayati

    2012-10-01

    Full Text Available Background: Insulin-like growth factor-1 can act in both an autocrine and paracrine manner to promote normal growth and malignant cellular proliferation. The importance of this factor as a major regulatory peptide has been established for cells, in vitro and in vivo. However, the role of serum insulin-like growth factor-1 levels in the etiology of benign prostatic hyperplasia and prostate cancer has not received sufficient attention. The aim of this study was to determine the relationship between benign prostatic hyperplasia, prostate cancer, and serum insulin-like growth factor-1 levels.Methods: We collected blood samples from 68 individuals with prostate cancer (cases and 68 individuals with benign prostatic hyperplasia (controls who were patients at Imam Khomeini Hospital in Tehran, Iran. Those with benign prostatic hyperplasia had normal prostatic specific antigen levels 0.05. Mean serum insulin-like growth factor-1 levels were 219 ng/ml for the case group and 133 ng/ml for the control group, which was significant (P=0.0009. We did not observe any correlation between age and insulin-like growth factor-1 in the case group (P=0.83, r= -0.47, however there was a significant correlation in the control group (P=0.007, r=0.549. Although correlation between prostate volume and serum insulin-like growth factor-1 levels was not statistically significant in the case group (P=0.38, r=0.213, therewas a positive correlation observed in the control group (P<0.008, r=0.537.Conclusion: Our findings suggest that insulin-like growth factor-1 may have an etiologic role in prostate cancer. This interpretation is strengthened by the significant difference observed between serum insulin-like growth factor-1 levels in benign prostatic hyperplasia and prostate cancer patients. These results also offer additional opportunities for evaluating patients who have abnormal digital rectal exams or prostate specific antigen levels, yet their biopsies are normal. Under

  11. Plasticity of tumor cell invasion: governance by growth factors and cytokines.

    Science.gov (United States)

    Odenthal, Julia; Takes, Robert; Friedl, Peter

    2016-12-01

    Tumor cell migration, the basis for metastatic dissemination, is an adaptive process which depends upon coordinated cell interaction with the environment, influencing cell-matrix and cell-cell adhesion, cytoskeletal dynamics and extracellular matrix remodeling. Growth factors and cytokines, released within the reactive tumor microenvironment and their intracellular effector signals strongly impact mechanocoupling functions in tumor cells and thereby control the mode and extent of tumor invasion, including collective and single-cell migration and their interconversions. Besides their role in controlling tumor cell growth and survival, cytokines and growth factors thus provide complex orchestration of the metastatic cascade and tumor cell adaptation to environmental challenge. We here review the mechanisms by which growth factors and cytokines control the reciprocal interactions between tumor cells and their microenvironment, and the consequences for the efficacy and plasticity of invasion programs and metastasis. © The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  12. The pivotal role of insulin-like growth factor I in normal mammary development.

    Science.gov (United States)

    Kleinberg, David L; Barcellos-Hoff, Mary Helen

    2011-09-01

    Mammary development begins in puberty in response to an estrogen (E(2)) surge. E(2) does not act alone. It relies on pituitary growth hormone (GH) to induce insulin-like growth factor I (IGF-I) production in the mammary stromal compartment. In turn, IGF-I permits E(2) (and progesterone) action. During puberty, E(2) and IGF-I synergize for ductal morphogenesis. During pregnancy, progesterone joins IGF-I and E(2) to stimulate secretory differentiation necessary to produce milk. Prolactin stimulates milk production, while transforming growth factor-β inhibits proliferation. The orchestrated action of hormones, growth factors, and receptors necessary for mammary development and function are also critical in breast cancer. Copyright © 2011. Published by Elsevier Inc.

  13. PWSCC Growth Assessment Model Considering Stress Triaxiality Factor for Primary Alloy 600 Components

    Directory of Open Access Journals (Sweden)

    Jong-Sung Kim

    2016-08-01

    Full Text Available We propose a primary water stress corrosion cracking (PWSCC initiation model of Alloy 600 that considers the stress triaxiality factor to apply to finite element analysis. We investigated the correlation between stress triaxiality effects and PWSCC growth behavior in cold-worked Alloy 600 stream generator tubes, and identified an additional stress triaxiality factor that can be added to Garud's PWSCC initiation model. By applying the proposed PWSCC initiation model considering the stress triaxiality factor, PWSCC growth simulations based on the macroscopic phenomenological damage mechanics approach were carried out on the PWSCC growth tests of various cold-worked Alloy 600 steam generator tubes and compact tension specimens. As a result, PWSCC growth behavior results from the finite element prediction are in good agreement with the experimental results.

  14. Epidermal transformation leads to increased perlecan synthesis with heparin-binding-growth-factor affinity

    DEFF Research Database (Denmark)

    Tapanadechopone, P; Tumova, S; Jiang, X

    2001-01-01

    . Despite this, the heparan sulphate of RT101- and JB6-derived perlecan bound fibroblast growth factor-1, -2, -4 and -7 and heparin-binding epidermal growth factor with similar affinity. Therefore abundant tumour-derived perlecan may support the angiogenic responses seen in vivo and be a key player......Perlecan, a proteoglycan of basement membrane and extracellular matrices, has important roles in both normal biological and pathological processes. As a result of its ability to store and protect growth factors, perlecan may have crucial roles in tumour-cell growth and invasion. Since...... the biological functions of different types of glycosaminoglycan vary with cellular origin and structural modifications, we analysed the expression and biological functions of perlecan produced by a normal epidermal cell line (JB6) and its transformed counterpart (RT101). Expression of perlecan in tumorigenic...

  15. Growth factor signaling to mTORC1 by amino acid–laden macropinosomes

    Science.gov (United States)

    Yoshida, Sei; Pacitto, Regina; Yao, Yao; Inoki, Ken

    2015-01-01

    The rapid activation of the mechanistic target of rapamycin complex-1 (mTORC1) by growth factors is increased by extracellular amino acids through yet-undefined mechanisms of amino acid transfer into endolysosomes. Because the endocytic process of macropinocytosis concentrates extracellular solutes into endolysosomes and is increased in cells stimulated by growth factors or tumor-promoting phorbol esters, we analyzed its role in amino acid–dependent activation of mTORC1. Here, we show that growth factor-dependent activation of mTORC1 by amino acids, but not glucose, requires macropinocytosis. In murine bone marrow–derived macrophages and murine embryonic fibroblasts stimulated with their cognate growth factors or with phorbol myristate acetate, activation of mTORC1 required an Akt-independent vesicular pathway of amino acid delivery into endolysosomes, mediated by the actin cytoskeleton. Macropinocytosis delivered small, fluorescent fluid-phase solutes into endolysosomes sufficiently fast to explain growth factor–mediated signaling by amino acids. Therefore, the amino acid–laden macropinosome is an essential and discrete unit of growth factor receptor signaling to mTORC1. PMID:26438830

  16. Controllable mineral coatings on PCL scaffolds as carriers for growth factor release.

    Science.gov (United States)

    Suárez-González, Darilis; Barnhart, Kara; Migneco, Francesco; Flanagan, Colleen; Hollister, Scott J; Murphy, William L

    2012-01-01

    In this study, we have developed mineral coatings on polycaprolactone scaffolds to serve as templates for growth factor binding and release. Mineral coatings were formed using a biomimetic approach that consisted in the incubation of scaffolds in modified simulated body fluids (mSBF). To modulate the properties of the mineral coating, which we hypothesized would dictate growth factor release, we used carbonate (HCO(3)) concentration in mSBF of 4.2 mm, 25 mm, and 100 mm. Analysis of the mineral coatings formed using scanning electron microscopy indicated growth of a continuous layer of mineral with different morphologies. X-ray diffraction analysis showed peaks associated with hydroxyapatite, the major inorganic constituent of human bone tissue in coatings formed in all HCO(3) concentrations. Mineral coatings with increased HCO(3) substitution showed more rapid dissolution kinetics in an environment deficient in calcium and phosphate but showed re-precipitation in an environment with the aforementioned ions. The mineral coating provided an effective mechanism for growth factor binding and release. Peptide versions of vascular endothelial growth factor (VEGF) and bone morphogenetic protein 2 (BMP2) were bound with efficiencies up to 90% to mineral mineral-coated PCL scaffolds. We also demonstrated sustained release of all growth factors with release kinetics that were strongly dependent in the solubility of the mineral coating. Copyright © 2011 Elsevier Ltd. All rights reserved.

  17. The Analysis of Theoretical Approaches to Identification of Factors of Regional Economic Growth

    Directory of Open Access Journals (Sweden)

    Kosyrieva Olena V.

    2016-05-01

    Full Text Available The article is devoted to the investigation of current approaches to identification of factors of economic growth in the regions. The theory of new economic geography based on works and studies of P. Krugman has been considered. There highlighted the key issues of regional economic growth requiring an in-depth studying and consideration in the elaboration of strategies for sustainable development of the regions. The views of leading domestic and foreign scholars as well as the OECD experts, the World Bank, the National Statistics Service of the United Kingdom and others on the main drivers of economic growth have been analyzed. On the basis of the study the factors of regional economic growth most commonly encountered in theory and practice have been generalized. It is proved that scientists and analysts most often classify as the factors of regional economic growth the following ones: those characterizing human potential, scientific-technical and innovative activity, management and institutional capacity. The factors less frequently correlated by specialists and scientists with the regional economic growth include: those characterizing the environment, business and sociopolitical factors, which is associated with difficulty of their quantification, but in any case does not diminish their importance.

  18. [Methodology comparison and influence factors analysis of epidermal growth factor receptor mutation detection].

    Science.gov (United States)

    Qian, Xiaoyan; Wang, Shuai; Shen, Yinchen; Wu, Di; Zhang, Zhishang; Feng, Yun; Han, Xiaohong; Shi, Yuankai

    2015-01-13

    To compare two different methods in detecting epidermal growth factor receptor (EGFR) mutation status of non-small cell lung cancer (NSCLC) , and investing the influences of different conserving methods in DNA quantity, quality and detecting results of formalin-fixed paraffin embedded (FFPE) tissue samples. One hundred and fifty FFPE samples of advanced NSCLC were collected in Cancer Institute/Hospital, Chinese Academy of Medical Sciences from November 2010 to August 2011. Both scorpions amplification refractory mutation system (scorpions ARMS) and direct sequencing were used to detect EGFR mutation in exon 18, 19, 20 and 21, together analyzed the differences between these two methods. Samples with inconsistent results were collected clinical treatment and survival information for further analysis. Extracted DNA from 30 FFPE samples and conserved at -20 °C for 3 years, meanwhile the same 30 FFPE samples DNA were extracted after conserving for 3 years. The DNA quantity, quality and testing results of the two conserving methods were compared. The detection success rate of Scorpions ARMS (100%) was higher than direct sequencing (87.3%), with statistical significance ( χ(2) = 20.28, P < 0.05). The consistent rate of the two methods was 84.7%, and there were no significant differences between these two methods, with a high consistence (Kappa = 0.738, P < 0.001) . The clinical treatment and survival status of 5 patients with different testing results were analysed, which were consistent with ARMS testing results. The quality of DNA extracted from FFPE tissues which were conserved for 3 years according to the conventional way was worse and with more fragments compared with DNA conserved at -20 °C for 3 years, but the EGFR mutation detecting results of the DNA acquired from the two conserved ways were consistent. Combination of Scorpions ARMS and direct sequencing could make the detecting result more comprehensive and reliable. Clinical treatment and survival data may

  19. Induction of vascular endothelial growth factor messenger ribonucleic acid expression in stored micrografts by aminoguanidine.

    Science.gov (United States)

    Krugluger, Walter; Rohrbacher, Wolfgang; Moser, Karl; Moser, Claudia; Laciak, Katharina; Hugeneck, Joerg

    2005-11-01

    Aminoguanidine (AMG) has been found to inhibit apoptotic cell death in hair follicle micrografts and improves the viability of isolated micrografts during the storage period in hair restoration surgery. In this study, we investigated the effect of AMG on messenger ribonucleic acid (mRNA) synthesis of growth factors in stored micrografts and primary cultures of follicle-derived cell populations. Hair follicles were obtained from 10 different patients undergoing routine micrograft transplant and were stored for 5 hours at room temperature in phosphate-buffered saline containing different concentrations of AMG. After a culture period of 72 hours, quantitative changes of mRNA for basic fibroblast growth factor (bFGF), insulin-like growth factor 1 (IGF-1), and vascular endothelial growth factor (VEGF) were determined by real-time reverse transcriptase-polymerase chain reaction (RT-PCR). Primary cell cultures of dermal papilla and outer root sheath cells were stimulated for 72 hours with AMG followed by RT-PCR measurement of growth factor mRNA. A dose-dependent induction of VEGF mRNA could be demonstrated in stored micrografts after stimulation with AMG (unstimulated: 1.0 [0.7-2.2]; AMG 10 pg/mL: 5.6 [3.1-9.7], p micrografts by AMG. Although the clinical relevance in post-transplant hair growth and wound healing needs further evaluation, the possibility of actively influencing growth factor production in isolated micrografts during the storage period is the basis for the development of hair follicle growth-promoting storage solutions in the future.

  20. Skeletal muscle hypertrophy and regeneration: interplay between the myogenic regulatory factors (MRFs) and insulin-like growth factors (IGFs) pathways.

    Science.gov (United States)

    Zanou, Nadège; Gailly, Philippe

    2013-11-01

    Adult skeletal muscle can regenerate in response to muscle damage. This ability is conferred by the presence of myogenic stem cells called satellite cells. In response to stimuli such as injury or exercise, these cells become activated and express myogenic regulatory factors (MRFs), i.e., transcription factors of the myogenic lineage including Myf5, MyoD, myogenin, and Mrf4 to proliferate and differentiate into myofibers. The MRF family of proteins controls the transcription of important muscle-specific proteins such as myosin heavy chain and muscle creatine kinase. Different growth factors are secreted during muscle repair among which insulin-like growth factors (IGFs) are the only ones that promote both muscle cell proliferation and differentiation and that play a key role in muscle regeneration and hypertrophy. Different isoforms of IGFs are expressed during muscle repair: IGF-IEa, IGF-IEb, or IGF-IEc (also known as mechano growth factor, MGF) and IGF-II. MGF is expressed first and is observed in satellite cells and in proliferating myoblasts whereas IGF-Ia and IGF-II expression occurs at the state of muscle fiber formation. Interestingly, several studies report the induction of MRFs in response to IGFs stimulation. Inversely, IGFs expression may also be regulated by MRFs. Various mechanisms are proposed to support these interactions. In this review, we describe the general process of muscle hypertrophy and regeneration and decipher the interactions between the two groups of factors involved in the process.