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中文摘要：
目的构建人抗原R（HuR）的真核表达载体,观察其在NIH3T3细胞中的表达并初步分析其生物学功能。方法提取NIH3T3细胞总RNA并反转录为cDNA,以cDNA为模板PCR扩增得到小鼠HuR编码序列,酶切后克隆至pcDNA3.1-FLAG载体;重组载体经PCR、酶切、测序鉴定正确后瞬时转染NIH3T3细胞,采用Western blotting分析HuR在细胞中的表达,并采用Real-time PCR检测HuR过表达对DUSP1mRNA水平的影响。结果成功构建了重组质粒pcDNA3.1-HuR-FLAG,Western blotting显示该质粒能在NIH3T3细胞中高效表达,Real-time PCR结果表明HuR过表达可提高细胞内DUSP1基因的mRNA水平。结论成功构建了带FLAG标签的HuR真核表达载体,该载体能在NIH3T3细胞中有效表达,并具有相应的生物学功能,为深入研究肿瘤细胞中HuR对DUSP1基因表达的调控机制奠定基础。
英文摘要：
Objective To construct a eukaryotic expression vector for HuR and analyze its expression and biological function in NIH3T3 cells.Methods The total RNA was extracted from NIH3T3 cells and reverse transcribed to cDNAs.The coding region sequence of mouse HuR was then amplified by PCR and subcloned into the pcDNA3.1-FLAG plasmid.The recombinant plasmid pcDNA3.1-HuR-FLAG was verified by PCR and restriction endonuclease analysis,confirmed by DNA sequence analysis,and then transiently transfected into NIH3T3 cells with Lipofectamine LTX.The expression of HuR protein was determined by Western blotting,and the mRNA level of HuR and DUSP1 were analyzed by using real-time PCR.Result The recombinant plasmid pcDNA3.1-HuR-FLAG was correctly constructed.Twenty-four hours after transfection of the recombinant plasmid into NIH3T3 cells,the fusion protein was found to have highly expressed in the cells as revealed by Western blotting.Real-time PCR results detected that the over-expression of HuR could up-regulate the expression of DUSP1.Conclusion The eukaryotic expression vector for HuR-FLAG fusion protein has been successfully constructed and transiently expressed in NIH3T3 cells.It can be used in further analysis of the posttranscriptional regulation of DUSP1 by HuR in cancer cells.
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