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Construction of a eukaryotic expression plasmid encoding the human HSF2 gene and its expression in Caco-2 cells

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Author:: No author available

Journal Title:: World Chinese Journal of Digestology

Issue:: 26

DOI:: No doi available

Key Word:: 热休克转录因子2;基因重组;真核表达;Caco-2;溃疡性结肠炎

Abstract：目的:构建人HSF2 pCMV-Myc真核表达载体,研究其在人结肠上皮肿瘤细胞Caco-2内的表达和定位.方法:以HSF2 Human cDNA ORF clone为模板,PCR法扩增出全长HSF2编码系列,用EcoRⅠ和pnⅠ对HSF2 PCR纯化产物双酶切后,采用基因重组技术将其插入至pCMV-Myc载体中.DNA测序正确后,脂质体法将重组质粒转染到Caco-2细胞内,提取细胞总RNA逆转录为cDNA后进行普通PCR检测HSF2 mRNA转录水平,提取细胞蛋白进行Western blot检测HSF2蛋白质水平及融合蛋白表达.采用激光共聚焦显微镜观察HSF2及融合蛋白在Caco-2内的表达和定位.结果:将人全长HSF2编码序列克隆到真核表达载体pCMV-Myc中,酶切鉴定片段为1 557 bp,重组质粒测序正确.转染重组质粒后,PCR显示HSF2在mRNA水平较未转染组和空载组升高；Western blot检测到融合蛋白正确表达,分子量约为70 kDa.与未转染组和空载组相比,重组质粒组HSF2蛋白质水平明显升高.激光共聚焦显微镜下观察到HSF2和融合蛋白定位一致,主要分布于Caco-2细胞质中,少量聚集在细胞核膜.结论:成功构建了人全长HSF2编码序列的pCMV-HSF2-FLAG真核表达载体,并在Caco-2细胞中成功表达,为进一步研究HSF2在溃疡性结肠炎中的作用奠定了良好的基础.

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