腺病毒介导的FasL基因转移及对肺癌细胞生长和凋亡的影响

Effects of human lung cancer A549 cell line by FasL gene transduction

目的:探讨FasL基因对人肺癌的作用以及FasL基因治疗肺癌的可能性。方法:通过腺病毒载体介导FasL基因转移到低水平表达FasL的人肺腺癌细胞系A549,对FasL基因的表达、细胞生长的抑制和肿瘤生长模型的治疗效果进行分析。结果:外源性FasL基因在靶细胞高水平的表达显著抑制了A549的生长和集落形成,流式细胞仪检测显示细胞G1期阻滞并发生了凋亡。瘤内注射Ad-FasL对裸鼠体内移植瘤有一定的抑瘤作用。结论:FasL基因参与了肿瘤细胞凋亡的诱导,能抑制肺腺癌细胞的生长,因此本基因在肿瘤的基因治疗上有着广泛的应用前景。

Purpose:To study the effect of FasL gene on human lung adenocarcinoma cell lines and possibility of ex- ogenous FasL gene for gene therapy of lung cancer.Methods:An adenoviral expression vector with full length cDNA of FasL gene insert was constructed(Ad-FasL) and transfected into A549 cells.The effect of exogenous FasL gene on the growth of A549 cells was examined in vitro and in vivo.Results:Expression of FasL gene in A549 cells was confirmed by FCM and RT-PCR.The in vitro growth of the Ad-FasL transfected A549 cells was significantly inhibited (inhibition rate: 84%) as compared to mock (Ad-LacZ) transfected A549 cells.Colony-forming activity in vitro of the Ad-FasL transfected A549 cells was completely inhibited.The Ad-FasL transfected cells became apoptotic which was confirmed by the appear- ance of pre-G_1 on flow cytometry (FCM).The growth of A549 xenografts in nude mice was retarded by intra-tumol injection of Ad-FasL.Conclusions:FasL gene participates in the induction of cell apoptosis.Its use in gene therapy of cancer is promising.