存活蛋白重组腺病毒载体的构建及其在树突状细胞的表达

本研究旨在构建含有人存活蛋白(survivin)基因的重组腺病毒载体,并探讨其在转染树突状细胞中的表达。以质粒pcDNA3.0-survivin为模板,通过PCR扩增获得survivin基因全长序列。PCR产物回收后经酶切,定向插入腺病毒穿梭质粒,获得重组质粒pShuttle-CMV-survivin。通过双酶切、PCR及插入片段测序鉴定后,将正确重组体pShuttle-CMV-survivin转化E.coliBJ5183菌(含腺病毒骨架质粒)并进行同源重组,然后筛选阳性克隆,提取质粒,将此重组腺病毒质粒分别进行酶切、线性化、纯化,用脂质体LipofectamineTM2000介导转染293细胞。制备病毒上清并测定其滴度,将病毒上清转染树突状细胞,应用Westernblot方法分析survivin的表达。结果表明成功构建了含有人survivin基因的重组腺病毒,病毒滴度为2.65×109pfu/ml。Westernblot鉴定显示,经重组腺病毒转染的DC可有效表达survivin。结论含survivin基因的重组腺病毒载体的构建成功,为下一步开展抗白血病免疫研究奠定实验基础。

Construction of Recombinant Adenovirus Vector Containing Human Survivin Gene and Its Expression in Dentritic Cells

The study was aimed to construct the recombinant adenovirus vectors containing human survivin gene, and to investigate their expression in transfected dendritic cells. Full length cDNA encoding survivin was obtained by PCR amplification from plasmid pcDNA3.0-survivin. The PCR product was restricted, and then inserted into pShuttle-CMV. The plasmids of pShuttle-CMV-survivin were linearized with PmeI, and the fragment containing survivin was ligated with pShuttle-CMV and transfected into E. coli BJ5183. After homologous recombination in bacteria, the extracted plasmid from the positive bacteria were linearized with PacI, transfected into HEK293 cells with liposome Lipofectamine 2000. Then, the harvested adenovirus supernatants were transfected into dendritic cells. The results showed that the recombinant adenovirus-survivin was constructed successfully and its titer was about 2.65 x 10(9) pfu/ml. The expression of survivin in transfected dendritic cells was confirmed by Western blot analysis. It is concluded that the recombinant adenovirus vector containing human survivin was constructed successfully, which may provide preliminary laboratory evidence for anti-leukemia immunotherapy.