小鼠Collectrin正反义真核表达载体的构建及其功能

目的:构建新基因Collectrin的正反义真核表达载体,研究其与细胞生长的关系.方法:以PCR的方法扩增Collectrin的开放阅读框序列,与载体pcDNA3.1/V5-His相连构成融合基因表达质粒.将重组后的质粒进行细菌转化,质粒扩增、纯化后,测序鉴定Collectrin的正义及反义序列.以脂质体介导的方法体外转染肾皮质集合管细胞系(M-1).以β-Gal staining的方法测定转染效率.分别行逆转录-PCR和Western blot,检测不同融合基因转染后细胞Collectrin mRNA和蛋白水平的表达变化.以四甲基偶氮唑蓝(MTF)参入法分别在第24小时、第48小时测定不同融合基因转染后细胞增殖活性.结果:M-1细胞在融合基因转染第24小时转染效率最高.Collectrin正义转染组较反义、空载体和正常对照组在核酸和蛋白水平表达量都显著增高,Collectrin反义转染组蛋白表达较其他组明显下调.反义转染组细胞较其他组明显减少.结论:成功构建了Collectrin正义及反义真核表达载体,Collectrin是维持细胞生长存活的重要元件.

Construction of sense and antisense eukaryotic expression vector of novel gene Collectrin and its function in cell growth

OBJECTIVE: To construct sense and antisense eukaryotic expression vector of novel gene Collectrin and identify its function in cell growth. METHODS: The open reading frame of Collectrin was amplified by PCR and inserted into pcDNA3.1/V5-His plasmid. The recombinant plasmid was identified by restriction enzyme analysis and sequencing analysis. The recombinant plasmid was transfected into M-1 cell by using lipofectin mediation after being identified by restriction enzyme analysis and sequencing analysis. RT-PCR and Western blot were performed to identify the expression of Collectrin. Beta-Gal staining was used to define the effect of transfection.The growth of M-1 cells was examined by MTT and cell counting. RESULTS: Compared with control group, the expression of Collectrin was decreased significantly at both nucleotide and protein levels transfected by antisense vector, but elevated in sense group. The cell growth was blocked after being transfected by antisense plasmid. CONCLUSION: The sense and antisense eukaryotic expression vector of novel gene Collectrin was successfully constructed. Collectrin was one of basic factors in cell growth.