cyclin E基因siRNA抑制K562细胞生长的研究

摘要

Objective To study the inhibitory effect of small interference RNA(siRNA) ofcyclin E gene on the growth ofK562cells. Methods siRNA targeting the 940 bp site of the cyclin E mRNA were designed and generated by PCR amplification.The PCR products containing U6 promoter and the siRNA were then transfected into K562 cells via LipofectamineTM2000.The cells transfected with non-functional siRNA served as the negative control group and those only treated with serum-free RPMI1640 as the blank control group. Cell counting, reverse transcriptase (RT)-PCR and flow cytometry were employed to evaluate the effect of RNA interference. Results Compared with the negative and blank control groups, the viable cell count in the interference group was decreased by approximately 80%, the ratio of G1-phase cells increased by nearly 30%, and growth arrest was observed. Cyclin E mRNA expression in the cells of the interference group was significantly lowered by about 70%as compared with that of the negative and blank control groups, whereas the latter two groups had similar expression levels.Conclusion RNA interference induces obvious inhibition of cyclin E gene expression, which consequently affects the proliferation ofK562 cells.%目的应用RNAi技术,研究cyclin E基因小干扰RNA(siRNA)对K562细胞生长的抑制作用.方法针对cyclin EmRNA设计siRNA序列,经PCR方法体外扩增,得到含有U6启动子以及siRNA序列的PCR产物,以LipofectamineTM2000脂质体法转染K562细胞,分别设置为干扰组、阴性对照组以及空白对照组,转染48 h后进行细胞计数、RT-PCR及通过PI染色进行流式细胞仪检测,观察其干扰效果.结果干扰组与阴性对照组和空白对照组相比,活细胞计数减少约80%,G1期细胞百分比增高30%,细胞基本停止增殖.干扰组cyclin E mRNA表达明显减弱,相对阴性对照组及空白对照组,干扰组mRNA表达下降70%.阴性对照组与空白对照组无显著性差异.结论应用RNAi技术可以有效地干扰cyclinE基因的表达,并进一步抑制细胞的生长,但对于干扰的长期有效性尚无实验结论,需通过长效表达载体实验验证.