دانلود رایگان مقاله انگلیسی ترادیسیدن فاکتور رشد بیماری فروکاهی دگزامتازون القا شده بیان ژن تترانکتین در زمان کانی سازی آزمایشگاهی SV-HFO رده سلولی استخوان ساز انسانی به همراه ترجمه فارسی
عنوان فارسی مقاله: | ترادیسیدن فاکتور رشد بیماری فروکاهی دگزامتازون القا شده بیان ژن تترانکتین در زمان کانی سازی آزمایشگاهی SV-HFO رده سلولی استخوان ساز انسانی |
عنوان انگلیسی مقاله: | Transforming growth factor-ill downregulates dexamethasone-induced tetranectin gene expression during the in vitro mineralization of the human osteoblastic cell line SV-HFO |
رشته های مرتبط: | پزشکی و زیست شناسی، ژنتیک، علوم سلولی و مولکولی، آسیب شناسی پزشکی و ژنتیک پزشکی |
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نشریه | الزویر – Elsevier |
کد محصول | f427 |
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بخشی از ترجمه فارسی مقاله: 1.مقدمه 2.مواد و روش ها |
بخشی از مقاله انگلیسی: 1. Introduction Transforming growth factor fll (TGF-flj) is a multifunctional compound that affects the proliferation, differentiation and gene expression pattern of several cell types, including osteoblasts [1-3]. Bone is an abundant source of TGFofll [1,2] and in vivo studies have shown that TGF-fll is a local regulator of bone formation. In osteoblast cell culture systems, TGF-fll regulates the mineralization process and the expression of osteoblastic markers, including alkaline phosphatase, c~1 (I) procollagen, osteopontin, osteonectin and osteocalcin [4-22]. We have recently established a human osteoblastic cell line, SV-HFO, by immortalizing normal human fetal calvaria osteoblasts with simian virus 40 (SV-40) [23]. The cells had morphological and ultrastructural features characteristic of osteoblasts and produced low levels of osteoblastic markers like alkaline phosphatase and osteocalcin. The osteoblastic SVHFO cells responded to osteotropic factors 1 ~,25-dihydroxyvitamin D3, retinoic acid and TGF-flj [24]. The direct effect of TGF-fll on SV-HFO cells included a reduction of the amount of both alkaline phosphatase and osteocalcin [24]. More recently, we have shown that the cells undergo mineralization upon treatment with glucocorticoids [25]. In the present study, we used this human osteoblastic in vitro model system to begin analysing the regulation of tetranectin gene expression during mineralization. Tetranectin is a protein originally isolated from plasma [26] that was found to be expressed in bone at a time and space coincident with mineralization in vivo and in vitro [27]. We report that dexamethasone treatment induced the expression of tetranectin mRNA and that TGF-fl~ inhibited mineralization and the induction of tetranectin mRNA. 2. Materials and methods 2.1. Cell culture The human osteoblastic SV-HFO cell line was established, cloned and maintained as previously described at 37°C in a humidified atmosphere of 95% air and 5% CO2 [23]. The cells at passage 14 were seeded at a cell density of 1 x l0 4 cells/cm 2 on 35- or 100-mm culture dishes (Corning Glass Works, Corning, NY) in c~-minimal essential medium (c~-MEM; GIBCO Laboratories, Grand Island, NY) supplemented with 10% fetal bovine serum (FBS; HR Bioscience, Lenexa, KS), 10 mM fl-glycerophosphate (fl-GP; Sigma, St Louis, MO), 100 U/ml penicillin and 100/lg/ml streptomycin (Immuno Biological Laboratories, Fujioka, Japan) and 20 mM N-2-hydroxyethylpiperazine-N’-ethane sulfonic acid (Hepes; Sigma). After 6 days of culture, the cells had reached confluence and dexamethasone (10 -6 M; Orgadrone, Sankyo, Tokyo, Japan) was added to the cultures either alone or together with TGF-fll (human platelet-derived TGF-fl6 Sigma) at various concentrations (0.5 or 5 ng/ml). The cultures were maintained for another 7 or 21 days and then examined by von Kossa staining for minerals, calcium (Ca) and phosphate (P) measurements and used for the isolation of total RNA. The complete culture medium was renewed every 2-3 days. |