逆转录病毒载体介导HSV1-tk/GCV肿瘤自杀基因治疗系统的构建  

Retroviral Vector Introduced in the Construction of HSV1-tk/GCV Antitumor Suicide-gene Therapeutic System

作　　者：杜标炎[1] 谭宇蕙[2] 吴映雅[2] 赵鹏[1] 周联[3] 赵亚刚[4] 

机构地区：[1]广州中医药大学病理教研室,广州510405 [2]广州中医药大学生化教研室,广州510405 [3]广州中医药大学免疫教研室,广州510405 [4]广州军区广州总医院消化科,广州510010

出　　处：《广州中医药大学学报》2004年第5期395-398,共4页Journal of Guangzhou University of Traditional Chinese Medicine

基　　金：国家自然科学基金(编号:30171201);广东省中医药管理局资助项目(编号:A401028);广州市科技计划项目(编号:2002J1-C7041)

摘　　要：[目的]探讨自杀基因抗肿瘤系统构建的方法.[方法]用DNA重组技术将单纯疱疹病毒胸苷激酶(HSV1 tk)定向克隆入逆转录病毒载体pLXSN,并用限制性内切酶进行酶切及测序鉴定;用PolyFect Transfection试剂介导重组逆转录病毒转染入包装细胞系PT67,通过G418筛选建立稳定产病毒的细胞株,将病毒感染人胃癌细胞,检测HSV1 tk自杀基因治疗系统在体外的抗肿瘤效应.[结果]经酶切鉴定和DNA序列测定,证明HSV1 tk基因成功定向插入到pLXSN载体中;重组病毒DNA转染包装细胞,筛选出对G418具稳定抗性的克隆PT67/tk,扩大培养,获取病毒滴度为4×104cfu/mL的重组逆转录病毒培养液;感染胃癌细胞SGC 7901后再筛选出G418抗性克隆株SGC 7901/tk.丙氧鸟苷(GCV)对SGC 7901/tk有明显杀伤作用,对SGC 7901无明显毒性,证明该病毒表达HSV1 tk基因,表达产物具有生物活性.[结论]将HSV1 tk定向克隆入逆转录病毒载体的方法可成功获取表达HSV1 tk基因的逆转录病毒,成功建立了肿瘤自杀基因治疗系统,这将为进一步研究中医药对自杀基因抗肿瘤的增效作用奠定基础.【Objective】 To explore a method for the construction of antitumor suicide-gene therapeutic system. 【Methods】 The thymidine kinase gene of herpes simplex virus type 1 (HSV1-tk) was orientationally cloned into the retroviral vector plasmid (pLXSN) by DNA recombinant technique, and then the recombinant plasmid of pLXSN-tk was identified by restriction endonuclease cutting and DNA sequencing. Introduced by PolyFect Transfection reagent, the recombinant plasmid was transfected into the packaging cell line PT67. Screened by G418, a cell line, which could produce virus stably, was obtained. The virus was transfected into human gastric carcinomatous cell strain SGC-7901 and the transfected SGC-7901 was applied to evaluate an anti-tumor effect. 【Results】 The identification with restriction endonuclease cutting and DNA sequencing showed that HSV1-tk was successfully inserted into the recombined plasmid of pLXSN-tk. The stable cloned PT67/tk was obtained by screening with G418 and then its amount was enlarged by culture, the titer of the PT67/tk solution being 4×10~4 cfu/mL. The anti-G418 cloned cell line SGC-7901/tk was got by infecting SGC-7901 with the virus. Anti-tumor experiment showed that GCV had an obvious toxic effect on SGC-7901/tk but had no effect on SGC-7901, indicating recombinant retroviral HSV1-tk expressed HSV1-tk gene which had biological activity. 【Conclusion】 Cloning HSV1-tk into the retroviral vector is effective in obtaining the recombinant retroviral HSV1-tk which can express HSV1-tk gene, and also effective in establishing an antitumor suicide-gene therapeutic system. This research naturally lays a foundation for further studying of Chinese medicines having synergistic anti-tumor action with suicide gene.

关 键 词：自杀基因 DNA 重组 基因 肿瘤抑制 基因疗法 

分 类 号：R285.5[医药卫生—中药学]