GPI-PLD过表达对肝癌细胞株HepG2生物学特征的影响

目的:研究GPI-PLD基因转染并过度表达对HepG2细胞的影响.方法:用脂质体转染法将本室已经构建的GPI-PLD真核表达载体pcDNA3.1( )/GPI-PLD转入HepG2细胞,以未转染的HepG2细胞及转染空载体pcDNA3.1( )的细胞为对照,G418筛选出阳性细胞克隆.用自制具完整GPI结构的胎盘碱性磷酸酶为底物,定量检测GPI-PLD活性,RT-PCR法确定GPI-PLD mRNA表达水平.细胞计数绘制生长曲线,荧光染色观察HepG2细胞形态学改变,流式细胞术检测凋亡,台盼蓝排斥法观察补体介导的细胞毒(CDC)杀伤率,ELISA检测癌胚抗原(CEA)的表达情况.结果:阳性细胞克隆GPI-PLD酶活性水平比对照组升高约2倍,GPI-PLD mRNA表达水平约增加5倍;GPI-PLD基因过度表达可促进GPI锚定的蛋白质如CEA和PLAP等被大量水解释放入培养基,导致细胞增殖能力减弱,对补体杀伤的敏感性增强,细胞呈现典型的凋亡形态特征,流式细胞术检测到凋亡峰,细胞凋亡率明显增加.结论:成功将GPI-PLD基因转染入HepG2细胞,并在细胞中稳定表达.GPI-PLD过表达能抑制肿瘤细胞增殖,促进肿瘤细胞的凋亡,增强肿瘤细胞对补体杀伤的敏感性.

Effect of overexpression of glycosylphosphatidylinositol-specific phospholipase D on biological character of hepatocellular carcinoma cell line HepG2

Objective To investigate the effect of overexpression of glycosylphosphatidyl-inositol-specific phospholipase D (GPI-PLD) on the biological character of hepatocellular carcinoma cell line HepG2. Methods The GPI-PLD gene eukaryon expression vector pcDNA3.1(+)/ GPI-PLD was transiently transfected into HepG2 cell by lipid-media transfection. The untransfected HepG2 and HepG2 transfected with pcDNA3.1(+) were used as controls. After screening with G418, the single clone was obtained. The expression level of GPI...