人截短型凋亡诱导因子的表达对HeLa细胞的促凋亡作用

目的：观察人截短型AIF基因的表达对HeLa细胞的促凋亡作用。方法：用RT-PCR法分段克隆全长人AIF基因，经改造截去其N-端线粒体定位信号及部分Spacer区域（1-120位氨基酸）的编码序列，从而获得人截短型AIF（AIF△1-120）基因。将其克隆入pIRES2-EGFP绿色荧光蛋白（EGFP）共表达载体，用脂质体法转染HeLa细胞，通过荧光显微镜观察。免疫组织化学检测，间接免疫荧光检测，电镜观察等方法。检测目的基因在转染细胞中的表达，以及对转染细胞的形态及生长状况的影响。结果：成功地构建了人截短型AIF（AIF△1-120)基因的真核表达载体。转染HeLa细胞后，可检测到人截短型AIF分子的表达，随着转染后时间的延长，可观察到表达人截短型AIF分子的HeLa细胞呈现典型的凋亡特征。结论：人截短型AIF基因的表达可诱导HeLa细胞凋亡。

Effect of the truncated human apoptosis-inducing factor expression on apoptosis of HeLa cells

AIM: To observe the expression of the truncated human apoptosis-inducing factor (AIF) gene and its apoptosis-in-ducing effect on HeLa cells. METHODS: Full-length human AIF gene was cloned by RT-PCR, then the truncated AIF gene was constructed by deleting the N-terminal mitochondria! location sequence (MLS), and inserted into the EGFP co-expression vector plRES2-EGFP. After being transfected into HeLa cells with Lipofectamin, the expression of the truncated AIF gene and its effect on HeLa cells morphology and growth condition were detected by fluorescence microscope, immunohistocnemical staining, indirect fluoroimmu-noassay and electron microscope analysis. RESULTS: The eukaryotic expression vector plRES2-EGFP containing of truncated human AIF gene was constructed successfully. The AIF protein could be detected in the transfected HeLa cells. After transfection, typical apoptotic feature of the transfected HeLa cells and a mass of cell death were observed under electron microscope. CONCLUSION: The expression of the truncated human AIF gene can induce apop-tosis of the transfected human HeLa cells.