hTERT对HeLa细胞放疗后细胞周期的影响Study of effects of telomerase activity on cell proliferation and chemosensitivity in HeLa cells.
奚玲;吴鹏;朱涛;王常玉;王世宣;马丁;
摘要(Abstract)：
目的:研究端粒酶逆转录酶(hTERT)对HeLa细胞放疗后细胞周期的影响。方法:将野生型端粒酶逆转录酶(WT-hTERT)、端粒酶逆转录酶显性负突变体(DN-hTERT)和对照质粒(pBABE)电转染于HeLa细胞中,RT-PCR法检测hTERT表达,TRAP-ELISA检测HeLa细胞端粒酶活性改变,Southern-B lot检测端粒长度改变,各转染组细胞分别经5Gy和10Gy60Co照射,流式细胞仪检测其在照射后0、24、48和72h细胞周期分布和凋亡的情况。结果:转染DN-hTERT后,HeLa细胞端粒酶活性下降,端粒长度显著缩短,而转染WT-hTERT后,HeLa细胞端粒酶活性增强,端粒长度较对照组长;各转染组细胞周期分布相似,经60Co照射24h后,各组细胞G2M峰均升高,并随照射剂量增加得更明显,其中WT-hTERT组G2M峰最高,而DN-hTERT组G2M峰最低,60Co照射48h后各组细胞亚G1峰均升高,其中WT-hTERT组最低,而DN-hTERT组最高,对照组和DN-hTERT组G2M阻滞进一步增加,G1峰下降,而WT-hTERT组G2M下降,G1峰升高。结论:DN-hTERT能抑制HeLa细胞端粒酶活性,进而缩短其端粒长度,增强其对放射线的敏感性,而WT-hTERT通过增强G2M阻滞率促进损伤细胞修复。
关键词(KeyWords)： 端粒酶;人端粒酶逆转录酶;细胞凋亡;细胞周期;放射增敏
基金项目(Foundation): 国家自然科学基金(30271358);; 97-3基金(2002CB513100)资助课题
作者(Authors): 奚玲;吴鹏;朱涛;王常玉;王世宣;马丁;
DOI: 10.13283/j.cnki.xdfckjz.2006.04.007
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