Objective To study the effects of microRNA101(miR-101)on radiosensitization of human uterine cervix cancer HeLa cells and underlying mechanism. Methods HeLa cells were divided into three groups including blank contr...Objective To study the effects of microRNA101(miR-101)on radiosensitization of human uterine cervix cancer HeLa cells and underlying mechanism. Methods HeLa cells were divided into three groups including blank control, miRNA negative control and miR-101 transfection group. The cells were irradiated by 160 kVp X-ray generated from a linear accelerator at a 目的 研究microRNA101(miR-101)对体外培养的人宫颈癌HeLa细胞辐射敏感性的影响及其作用机制.方法 实验设为3组,分别为空白对照组、阴性对照组和实验组.采用160 kVp X射线照射细胞,吸收剂量率为1.15 Gy/min.实时定量PCR(qRT-PCR)法检测miR-101的过表达情况;克隆形成实验检测miR-101对HeLa细胞辐射敏感性的影响;γ-H2AX免疫荧光法检测细胞DNA双链断裂,Western blot实验观察ATM和DNA-PKcs蛋白表达量变化.结果 转染48 h后,实验组的细胞与空白对照组相比,miR-101的表达量明显增加(t=14.16,P〈0.05).过表达miR-101的HeLa细胞存活率明显降低(t=10.75,P〈0.05).miR-101能增加HeLa细胞的辐射敏感性(F=7.72,P〈0.05),辐射增敏比为1.29.γ-H2AX免疫荧光显示,miR-101能抑制辐照后细胞DNA损伤修复.过表达miR-101的HeLa细胞与对照组相比,ATM和DNA-PKcs蛋白表达量明显减少.结论 miR-101 mimic对HeLa细胞的生长有抑制作用.miR-101过表达能增加HeLa细胞的辐射敏感性,miR-101通过抑制辐照后DNA损伤修复提高辐射敏感性.展开更多
文摘Objective To study the effects of microRNA101(miR-101)on radiosensitization of human uterine cervix cancer HeLa cells and underlying mechanism. Methods HeLa cells were divided into three groups including blank control, miRNA negative control and miR-101 transfection group. The cells were irradiated by 160 kVp X-ray generated from a linear accelerator at a 目的 研究microRNA101(miR-101)对体外培养的人宫颈癌HeLa细胞辐射敏感性的影响及其作用机制.方法 实验设为3组,分别为空白对照组、阴性对照组和实验组.采用160 kVp X射线照射细胞,吸收剂量率为1.15 Gy/min.实时定量PCR(qRT-PCR)法检测miR-101的过表达情况;克隆形成实验检测miR-101对HeLa细胞辐射敏感性的影响;γ-H2AX免疫荧光法检测细胞DNA双链断裂,Western blot实验观察ATM和DNA-PKcs蛋白表达量变化.结果 转染48 h后,实验组的细胞与空白对照组相比,miR-101的表达量明显增加(t=14.16,P〈0.05).过表达miR-101的HeLa细胞存活率明显降低(t=10.75,P〈0.05).miR-101能增加HeLa细胞的辐射敏感性(F=7.72,P〈0.05),辐射增敏比为1.29.γ-H2AX免疫荧光显示,miR-101能抑制辐照后细胞DNA损伤修复.过表达miR-101的HeLa细胞与对照组相比,ATM和DNA-PKcs蛋白表达量明显减少.结论 miR-101 mimic对HeLa细胞的生长有抑制作用.miR-101过表达能增加HeLa细胞的辐射敏感性,miR-101通过抑制辐照后DNA损伤修复提高辐射敏感性.