目的探究在紫外线暴露下环指蛋白20(ring finger protein 20,RNF20)低表达对胃癌细胞DNA损伤修复的影响及其相关作用机制。方法实验采用慢病毒载体构建稳定低表达胃癌细胞系,分为对照组和RNF20敲低组,用CCK-8法检测两组细胞的增殖情况,...目的探究在紫外线暴露下环指蛋白20(ring finger protein 20,RNF20)低表达对胃癌细胞DNA损伤修复的影响及其相关作用机制。方法实验采用慢病毒载体构建稳定低表达胃癌细胞系,分为对照组和RNF20敲低组,用CCK-8法检测两组细胞的增殖情况,用总共照射剂量为20 J/m^(2)紫外线照射胃癌MGC803细胞,采用Western blotting及免疫荧光技术检测两组细胞γ-H2AX、RAD51和p21的情况。结果荧光显微镜观察两组细胞均有绿色荧光蛋白表达;CCK-8显示RNF20表达降低会促进胃癌细胞增殖;敲低组细胞中RNF20蛋白较对照组表达降低。与对照组相比,经20 J/m^(2)紫外线照射细胞后,敲低组γ-H2AX消失更加迟缓,RAD51蛋白表达降低,p21蛋白表达下降趋势更慢。结论RNF20敲低会抑制紫外线诱导的胃癌细胞DNA损伤修复过程。展开更多
基金supported by the‘XiaoXiang Scholar’Talents Foundation of Hunan Normal University,China (23040609)Hunan Provincial Innovation Foundation for Postgraduate,China (CX2012B223)+1 种基金Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province,ChinaThe Hundred Talents Foundation of Hunan Province is gratefully acknowledged for the financial support to S. J. and S. R. K.~~