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Correlation between overexpression of DNA polymerase beta gene and drug-resistence of human esophageal carcinoma cells
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 12
- DOI:
- 10.3321/j.issn:1000-2790.2007.12.003
- Key Word:
- DNA 聚合酶β;转染;食管肿瘤;肿瘤细胞,培养的;抗药性,肿瘤;四甲基偶氮唑蓝
Abstract： 目的:建立人食管癌顺铂耐药细胞系及稳定高表达人野生型DNA聚合酶beta(polβ)的食管癌细胞系,分析polβ高表达与食管癌细胞耐药的相关性.方法:顺铂(cDDP)中等浓度、间歇作用法历时9 mo建立耐药细胞系Ec9706/cDDP;同时脂质体转染法将人野生型polβ重组绿色荧光蛋白表达载体pEGFP-AC3转染入Ec9706细胞,经G418筛选得到稳定转染细胞系.荧光显微镜观察转染效果,普通倒置显微镜观察细胞形态变化.RT-PCR方法分别检测耐药细胞与转染细胞中polβmRNA的表达水平,MTT法检测各组细胞对cDDP的敏感性.结果:荧光显微镜下转染细胞荧光强,转染效率高,倒置显微镜下耐药细胞与转染前后细胞形态无明显改变.RT-PCR结果表明耐药细胞Ec9706/cDDP中polβ表达较亲本细胞增加,转染细胞的polβ表达较空载体转染细胞、对照细胞也增加.Ec9706/cDDP细胞耐药指数为15.70;转染后细胞对cDDP的敏感性降低,耐药指数为1.78.结论:成功建立了耐药细胞系Ec9706/cDDP与稳定高表达人野生型polβ的Ec9706细胞系,polβ的高表达可引起耐药性的产生,耐药细胞中polβ的表达也增高.polβ的表达与食管癌细胞的耐药性有一定相关性.
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