用表达T7RNA聚合酶细胞系拯救麻疹病毒微复制子  

Rescue of Minireplicon by Using the Cell Line Stably Expressing the T7 RNA Polymerase

作　　者：修梅红[1] 王芹[1] 唐丽华[1] 曹守春[1] 李伟红[1] 韦燕[1] 陆鹏[1] 梁米芳[1] 李德新[1] 

机构地区：[1]中国疾病预防控制中心病毒病预防控制所传染病预防控制国家重点实验室,北京100052

出　　处：《病毒学报》2007年第4期326-330,共5页Chinese Journal of Virology

基　　金：863计划以麻疹病毒疫苗株为载体的新型疫苗研究(863-2001AA215131)

摘　　要：构建稳定表达T7RNA聚合酶的细胞系,用于提高拯救麻疹病毒微复制子效率。PCR扩增T7RNA聚合酶基因,克隆到真核表达载体,转染Vero细胞,用G418筛选到稳定表达的细胞株Vero/pcDNA3-T7。用Westernblotting证明了T7RNA聚合酶在细胞中的表达。将T7启动子控制绿色荧光蛋白表达的质粒转染该细胞后,绿色荧光蛋白在细胞株中得到表达。反向插入报告基因的微复制子转染感染麻疹病毒的Vero/pcDNA3-T7细胞后,细胞中能够检测到报告基因的表达。用细胞系取代痘苗病毒系统,可以提高拯救效率。To improve the rescue efficiency of measles virus cDNA clone, the cell line that stably expressed the T7 RNA polymerase was established. Firstly, the T7 RNA polymerase gene was amplified by PCR and then the PCR product was inserted into pcDNA3 to obtain plasmid pcDNA3-T7. Vero cell was transfected with the plasmid and G418 was added to the cell 24h later to kill the cells without the plasmid. Western blotting analysis showed that the Vero/pcDNA3-T7 cell could express T7 RNA polymerase. To analyze the gene function of T7 RNA polymerase, the pT7IP EGFP plasmid was transfected into the Vero/pcDNA3 T7 cell and EGFP was analized by fluorescence. The result suggested that T7 RNA polymerase expressed in the Vero/pcDNA3-T7 cell could transcribe the gene under control of the T7 promoter. Moreovet, the minigenome PminiEGFP inserted reversely with report gene EGFP was established. After trans fection with the plasmid and infection with measles virus, EGFP was expressed, indicating the Vero/pcDNA3-T7 cell could rescue the minigenome.

关 键 词：T7RNA聚合酶 细胞系 反向遗传 麻疹病毒 

分 类 号：R373.11[医药卫生—病原生物学]