重组腺病毒介导的KDR-CDglyTK基因靶向杀伤胃癌细胞的体外实验研究  

Inhibitory effect of recombinant adenovirus containing CDglyTK double suicide gene driven by KDR promoter on human stomach adneocarcinoma SCG7901 cells in vitro

作　　者：李强[1] 黄宗海[1] 厉周[1] 俞金龙[1] 

机构地区：[1]南方医科大学珠江医院普外科,广东广州510282

出　　处：《南方医科大学学报》2010年第1期16-20,24,共6页Journal of Southern Medical University

基　　金：国家863计划项目(2001AA217171);广东省自然科学基金项目(013072)

摘　　要：目的探讨腺病毒介导KDR启动子驱动的双自杀基因体系对人胃癌细胞SCG7901靶向杀伤作用以及是否存在旁观者效应。方法用MOI=100时,将携带融合基因重组腺病毒Ad-KDR-CDglyTK及Ad-CMV-CDglyTK体外感染SCG7901、ECV304和HepG2细胞,检测细胞的感染效率以及转基因肿瘤细胞在mRNA水平上融合基因的表达;在前药5-氟胞嘧啶(5-FC)和/或更昔洛韦分别按不同浓度、不同作用时间和方式下,观察双自杀基因体系对SCG7901细胞的靶向杀伤作用和旁观者效应。结果携带双自杀基因(CDglyTK)和报告基因(GFP)的重组腺病毒载体,感染复数为100时,95%以上的受感染SCG7901、HepG2和ECV304细胞中有GFP表达。感染腺病毒Ad-CMV-CDglyTK的各细胞以及感染腺病毒Ad-KDR-CDglyTK的SCG7901及ECV304细胞对单一前药具有较高的敏感性,细胞的存活率各随单一前药浓度的增加而递减;而感染腺病毒的Ad-KDR-CDglyTK的HepG2细胞对前药不敏感。感染腺病毒Ad-KDR-CDglyTK的SCG7901及ECV304细胞分别在同一浓度前药的作用下,细胞的存活率与时间存在依赖关系,而感染腺病毒Ad-KDR-CDglyTK的HepG2细胞不存在依赖关系。将感染腺病毒的细胞与未感染的细胞按不同比例混合培养,观察到该体系明显的旁观者效应,并随转基因细胞的比例增加逐渐递增。转基因SCG7901和同种细胞混合,在联合应用前药时,不同混合细胞比例下均出现药物协同作用。结论Ad-KDR-CDglyTK双自杀基因可在体外靶向杀伤SCG7901、ECV304细胞并观察到在细胞中存在旁观者效应,联合应用前药可产生明显的协同作用。Objective To study the inhibitory effect of adenovirus-mediated fusion gene system driven by KDR promoter on the proliferation of human gastric adneocarcinoma SCG7901 cells and observe the bystander effect in vitro. Methods SCG7901, ECV304 and HepG2 cells were infected with Ad-KDR-CDglyTK and Ad-CMV-CDglyTK at a multiplicity of infection （MOI） of 100, and the infection efficiency and the mRNA expressions of the transferred fusion gene were investigated. GCV and/or 5-FC at different concentrations were added into the culture medium of the infected cells to observe the targeted antitumor effect and bystander effect of CDglyTK suicide gene driven by KDR promoter. Results With the MOI of the adenovirus of 100, the fluorescence emitted by green fluorescent protein （GFP） was observed in 95% of the infected SCG7901, ECV304 and HepG2 cells. All the cells infected by Ad-CMV-CDglyTK and SCG7901 and ECV304 cells infected by Ad-KDR-CDglyTK were highly sensitive to the prodrugs. In comparison, HepG2 cells infected with Ad-KDR-CDglyTK did not show much sensitivity to the two prodrugs. Following treatment with the prodrugs at the same concentration, the infected SCG7901 and ECV304 cells exhibited gradually lowered survival rates as the culture time was prolonged, whereas the transgenic HepG2 cells showed no such time-dependent changes. When the non-infected cells were cocultured with the transgenic cells, the bystander effect of CDglyTK gene was observed, which increased with the ratio of the transgenic cells. In these mixed cell culture systems, GCV and 5-FC showed obvious synergetic effect in suppressing the cell survival. Conclusion The CDglyTK fusion gene system driven by KDR promoter can inhibit the proliferation of SCG7901 and ECV304 cells with obvious bystander effect in vitro. The combination of the prodrugs produces obvious synergetic effect against the cell survival.

关 键 词：胃癌 自杀基因治疗 血管内皮生长因子受体 旁观者效应 

分 类 号：R735.2[医药卫生—肿瘤]