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机构地区:[1]中南大学湘雅三医院儿科,湖南长沙410013
出 处:《中国现代医学杂志》2008年第19期2792-2794,共3页China Journal of Modern Medicine
基 金:湖南省卫生厅科研基金(No:B2005-072);教育部留学回国启动基金(No:2006-331)
摘 要:目的探讨TGF-β1及其信号转导分子Smad3在肌成纤维细胞(C2C12)增殖中的作用。方法TGF-β1作用C2C12细胞,对Smad3基因进行RNA干扰,用[3H]测定法检测TGF-β1诱导的C2C12细胞增殖。结果0、1、5和10ng/mLTGF-β1作用C2C12细胞后,其[3H]值(cpm/min)分别是(630±17),(907±19),(1493±25),(1808±24),F=3080.499,P=0.000。经200pmol/LsiRNA-Smad3转染24h,再用5ng/mLTGF-β1作用24h,测定细胞增殖,其[3H]值(cpm/min)分别是(464±30)(空白对照组),(1062±50)(内对照组),(428±38)(实验组),F=412.186,P=0.000。结论TGF-β1通过Smad3信号转导促进C2C12细胞增殖并呈剂量依赖性,siRNA-Smad3可以有效地阻断其信号转导而降低C2C12细胞增殖。[Objective] To investigate the effects of smad3 on the growth of C2C12 cells induced by TGF-β1. [Methods] C2C12 cells were transfeeted with siRNA-Smad3 in vitro, and the cell proliferations were examined with 3H-Thymidine methods. [Results] After the C2C12 cells interfered with different concentrations of TGF-β1(0,1,5 and 10 ng/mL) for 24 h, the [3H] values (cpm/min) were (630±17), (907±19), (1493±25), (1808±24) respectively, F=3080.499, P=0.000. While the C2C12 cells were transfected with 200 pmol/L of siRNA-Smad3 for 24 h and then treated with 5 ng/mL TGF-β1 for 24 h,the [3H] values (epm/min) were (464±30) (blank control group), (1062±50) (internal control group), (428±38) (experimental group), (F=412.186, P=0.000). [Conclusion] The TGF-β1 could promote C2C12 cells proliferation by Smad3 and showed dose dependent manner. The siRNA-Smad3 could block the signal transduction and decreased C2C12 cells proliferation effectively.
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