抑制ATM表达致鼻咽癌细胞CNE1辐射增敏的细胞周期阻滞研究

被引:17
作者
王宏梅 [1 ]
陈龙华 [1 ]
郑小康 [1 ]
伍新尧 [2 ]
夏云飞 [3 ]
机构
[1] 南方医科大学南方医院放疗科
[2] 中山大学基础医学院法医物证教研室
[3] 华南肿瘤学国家重点实验室
关键词
ATM基因; CNE1细胞; 细胞周期; 调控; 鼻咽肿瘤;
D O I
暂无
中图分类号
R739.63 [咽肿瘤];
学科分类号
100213 [耳鼻咽喉科学];
摘要
背景与目的:细胞周期调控是决定细胞辐射敏感性的决定性因素之一。共济失调毛细血管扩张症突变基因(ataxia-telangiectasia mutant,ATM)功能与细胞DNA损伤修复、细胞周期检查点调控密切相关。我们前期研究通过反义RNA抑制ATM基因表达可增加鼻咽癌细胞系CNE1辐射敏感性,本研究拟探讨其辐射增敏的细胞周期阻滞调控机制。方法:ATM反义组细胞CNE1/pDOR-atm及对照组细胞CNE1/pDOR经2Gy、5GyX线照射后不同时间点(1h、4h、8h、24h、48h)收获,应用流式细胞仪(flowcytometer,FCM)检测各细胞周期百分比及凋亡率。结果:两组细胞X线照射后均未出现明显G1期阻滞和细胞凋亡,但分别在照射后1h、4h、8h出现明显S期阻滞,24h、48h出现明显G2期阻滞,其中反义组S期细胞百分率总均数水平低于对照组(P<0.05),而G2/M期细胞百分率总均数水平高于对照组(P<0.05)。结论:反义RNA抑制ATM表达致CNE1辐射增敏的细胞周期调控机制可能与减少S期细胞比例,增加G2/M期细胞比例有关,与G1期阻滞和细胞凋亡的调控无关。
引用
收藏
页码:466 / 470
页数:5
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