抑癌基因PTEN对人结肠癌LoVo细胞生长的影响

Effects of anticancer gene PTEN on human colon cancer LoVo growth

目的:探讨PTEN基因转染对结肠癌LoVo细胞的抑制作用。方法:将人野生型及突变型PTENcDNA通过脂质体导入结肠癌细胞LoVo中,并用RT-PCR、流式细胞术检测细胞的PTENmRNA和蛋白质表达。用流式细胞仪和MTT法分析5-Fu对转染前后LoVo细胞抑制周期和诱导凋亡的能力。结果:转染野生型PTEN基因可明显增强结肠癌LoVo细胞的PTEN表达,5-Fu对转染后的LoVo细胞抑制细胞周期和诱导凋亡的作用明显增强。突变型在结肠癌细胞LoVo中有表达但无明显抑制作用。结论:转染的PTEN基因可显著上调结肠癌LoVo细胞的PTEN表达,促进细胞凋亡;联合应用PTEN基因转染和5-Fu可获得协同的细胞毒作用。

Objective To study the inhibitive effect of transfected PTEN on LoVo cells. Method The human PTEN cDNA was transfered into LoVo cells via lipofectin and PTEN mRNA levels and its expression were analysized by flow cytometry. Before or after transfection, the activities of 5-Fu in inhibiting cell proliferation and inducing apoptosis were measured by flow cytometry and MTT. Results PTEN transfection significantly up-regulated PTEN expression in LoVo cells. 5-Fu inhibited cell proliferation and induced apoptosis in transfected LoVo cell. Conclusion Transfected PTEN remarkably up-regulated PTEN expression in LoVo cells and promoted the apoptosis. PTEN transfection associated with 5-Fu treatment had cooperatively cytotoxic effect.