人线粒体超氧化物歧化酶真核表达载体的构建及其在HUVEC中的表达

目的：构建人线粒体超氧化物歧化酶2（SOD2）的真核细胞表达载体，探讨其在人脐静脉内皮细胞（HUVEC）中的表达效果。方法：以HUVEC mRNA为原始模板,应用RT-PCR技术,扩增编码线粒体SOD2全长的cDNA片段。利用分子生物学技术，将扩增的cDNA片段与真核细胞表达载体pcDNA3.0的多酶切位点相连接，构成重组质粒并转染到HUVEC，将细胞分为HUVEC母细胞组、转染pcDNA3.0空载组和转染pcDNA3.0-SOD2组。应用RT-PCR方法检测SOD2在HUVEC中的表达情况。结果：将表达SOD2全长cDNA片段定向克隆至质粒pcDNA3.0，测序结果表明成功构建人线粒体SOD2的真核细胞表达载体pcDNA3.0-SOD2。该载体稳定转染HUVEC后，在细胞内获得了稳定表达。与母细胞组和空载组比较，转染pcDNA3.0-SOD2组SOD2 mRNA表达水平明显增加。结论：成功构建SOD2的真核细胞表达载体pcDNA3.0-SOD2，并在人HUVEC中成功表达。本研究为SOD2对细胞保护作用研究提供了实验模型。

Construction of eukaryotic expression vector of human mitochondrial superoxide dismutase and its expression in HUVEC

To construct the recombinant eukaryotic expression vector of mitochondrial superoxide dismutase 2 (SOD2) and to explore its expression efficacy in human umbilical vein endothelial cells (HUVEC).Methods SOD2 gene full-length cDNA was amplified from HUVEC by RT-PCR and the target gene SOD2 was connected with the plasmid pcDNA3.0 vector.The recombinant plasmid was constructed and transfected into HUVEC.The cells were grouped into HUVEC,pcDNA3.0 and pcDNA3.0-SOD2 transfected groups.The expression of SOD2 in HUVEC was detected by RT- PCR.