igf1对肾小管上皮细胞转分化作用机制的影响-effects of i gf1 on the mechanism of transdifferentiation of renal tubular epithelial cells.docx
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igf1对肾小管上皮细胞转分化作用机制的影响-effects of i gf1 on the mechanism of transdifferentiation of renal tubular epithelial cells
目录中文摘要...................................................................................................................1英文摘要...................................................................................................................3常用英文缩略词表..................................................................................................6前言.........................................................................................................................7材料与方法.............................................................................................................12结果.........................................................................................................................21讨论.........................................................................................................................30结论.........................................................................................................................35参考文献.................................................................................................................36综述……………………………………………………………………………….40参考文献…………………………………………………………………………..46致谢………………………………………………………………………………..49IGF-1对肾小管上皮细胞转分化作用机制的影响研究生:林美卿导师:黄国良教授中文摘要目的:探讨PI3K/Akt通路在IGF-1诱导的人肾小管上皮细胞(humankidneyproximaltubularepithelialcellline,HKCs)间质转分化过程中的作用和意义。方法:用含10%胎牛血清(FBS)的DMEM/F12(1:1)培养液将HKCs细胞培养于6孔板或培养瓶中,待细胞生长至亚融合状态,吸弃培养基,换成无血清(freeserummedium,FSM)的培养基继续培养24h,然后分成:①正常对照组:用10%FBS的DMEM/F12培养液培养细胞;②IGF-1(50ug/L)组:用50ug/LIGF-1培养细胞;③IGF-1+PI3K/Akt抑制剂LY294002组:用50ug/LIGF-1+15umol/LLY294002培养细胞;按以上分组分别培养24h、48h和72h。免疫印迹法(westernblotting)方法检测a-平滑肌肌动蛋白(a-SMA)、总Akt(t-Akt)和磷酸化Akt(p-Akt)蛋白表达。再按上述方法将细胞分为:①正常对照组;②IGF-1(50ug/L)组;③IGF-1+不同浓度的LY294002(5、15、20umol/L)组,共同培养48h。倒置相差显微镜观察细胞形态变化;聚合酶链式反应(RT-PCR)方法检测a-SMA和p-AktmRNA表达水平。DAPI染色法检测HKCs细胞凋亡的情况。结果:(1)WB结果显示:随着IGF-1(50ug/L)作用时间的延长,a-SMA蛋白表达上调(p0.05),Akt蛋白表达上调(p0.05),p-Akt蛋白表达上调(p0.05),且作用呈时间依赖性。(2)与IGF-1(50ug/L)单独作用于HKCs细胞相比,IGF-1(50ug/L)和LY294002(15umol/L)共同作用后,a-SMA蛋白表达下
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