MiR-122 is one of the non-coding RNAs which showed its effects on the lipo-metablism, virus infection and HCC forming through regulation of liver gene expression. Its eukaryotic expression vector was constructed by us...MiR-122 is one of the non-coding RNAs which showed its effects on the lipo-metablism, virus infection and HCC forming through regulation of liver gene expression. Its eukaryotic expression vector was constructed by using pSuper which was widely applied in the siRNA expression. The precursor of human miR-122 gene was amplified by polymerase chain reaction （PCR） from the human genomic DNA. The positive clones were screened by PCR and restriction enzyme digestion. The new expression vector of miR-122 was named pHsa-m122. PHsa-m122 and its controls were transfected to HepG2 cells. The miR-122 expression activity was evaluated by GFP122i sensor reporter plasmid through fluorescence detection and Western blot. It was shown that the fluorescence intensity of GFP122si and pHsa-m122 co-transfection group was weaker than that of the controls, so the functional activity of expressed miR-122 was detected. When HepG2 cells were co-transfected with HBV1.3 and pHsa-m122 plasmids, the results showed miR-122 may down-regulate the gene expression of HBV. The human liver specific microRNA eukaryotic expression vector of miR-122 was constructed successfully, which may facilitate further study of its function in the development of liver virus infection diseases and HCC. Cellular ＆ Molecular Immunology.展开更多
为了探讨靶向人端粒酶反转录酶(hTERT)基因的小干扰RNA(s iRNA)表达载体是否具有抑制H eL a细胞端粒酶活性的能力,人工合成2条64个核苷酸(n t)的片段,其中19n t与hTERT基因1789-1807位碱基同源,将其退火、连接到质粒pSU PER中,构建pSU P...为了探讨靶向人端粒酶反转录酶(hTERT)基因的小干扰RNA(s iRNA)表达载体是否具有抑制H eL a细胞端粒酶活性的能力,人工合成2条64个核苷酸(n t)的片段,其中19n t与hTERT基因1789-1807位碱基同源,将其退火、连接到质粒pSU PER中,构建pSU P-hTE。在pSU P-hTE基础上,把该质粒的启动子和64n t插入片段酶切、克隆到质粒pEGFP-C 1中生成pEGFP-hTE,从而获得新霉素抗性筛选质粒。将pEGFP-hTE用脂质体转染H eL a细胞,G 418筛选后获得抗性克隆并将其收获、传代,用不同方法检测hTERT的mRNA和蛋白表达水平、H eL a细胞的端粒酶活性以及细胞的增殖能力。结果显示,pEGFP-hTE转染的H eL a细胞与对照组比较,hTERT的mRNA水平下降及蛋白表达减少、细胞端粒酶活性降低38%,但细胞增殖能力没有明显改变。以上结果表明,pEGFP-hTE能通过RNA干扰(RNA i)途径特异性抑制H eL a细胞hTERT基因的表达,从而有效抑制细胞端粒酶活性,这可能将为肿瘤生物治疗提供一条新的途径。展开更多
基金financially supported by the grants from Natural Science Foundation of Hubei Province(No.2006ABA143)Foundation of Tongji Medical College of Huazhong University of Science and Technology(No.01510747).
文摘MiR-122 is one of the non-coding RNAs which showed its effects on the lipo-metablism, virus infection and HCC forming through regulation of liver gene expression. Its eukaryotic expression vector was constructed by using pSuper which was widely applied in the siRNA expression. The precursor of human miR-122 gene was amplified by polymerase chain reaction （PCR） from the human genomic DNA. The positive clones were screened by PCR and restriction enzyme digestion. The new expression vector of miR-122 was named pHsa-m122. PHsa-m122 and its controls were transfected to HepG2 cells. The miR-122 expression activity was evaluated by GFP122i sensor reporter plasmid through fluorescence detection and Western blot. It was shown that the fluorescence intensity of GFP122si and pHsa-m122 co-transfection group was weaker than that of the controls, so the functional activity of expressed miR-122 was detected. When HepG2 cells were co-transfected with HBV1.3 and pHsa-m122 plasmids, the results showed miR-122 may down-regulate the gene expression of HBV. The human liver specific microRNA eukaryotic expression vector of miR-122 was constructed successfully, which may facilitate further study of its function in the development of liver virus infection diseases and HCC. Cellular ＆ Molecular Immunology.
文摘为了探讨靶向人端粒酶反转录酶(hTERT)基因的小干扰RNA(s iRNA)表达载体是否具有抑制H eL a细胞端粒酶活性的能力,人工合成2条64个核苷酸(n t)的片段,其中19n t与hTERT基因1789-1807位碱基同源,将其退火、连接到质粒pSU PER中,构建pSU P-hTE。在pSU P-hTE基础上,把该质粒的启动子和64n t插入片段酶切、克隆到质粒pEGFP-C 1中生成pEGFP-hTE,从而获得新霉素抗性筛选质粒。将pEGFP-hTE用脂质体转染H eL a细胞,G 418筛选后获得抗性克隆并将其收获、传代,用不同方法检测hTERT的mRNA和蛋白表达水平、H eL a细胞的端粒酶活性以及细胞的增殖能力。结果显示,pEGFP-hTE转染的H eL a细胞与对照组比较,hTERT的mRNA水平下降及蛋白表达减少、细胞端粒酶活性降低38%,但细胞增殖能力没有明显改变。以上结果表明,pEGFP-hTE能通过RNA干扰(RNA i)途径特异性抑制H eL a细胞hTERT基因的表达,从而有效抑制细胞端粒酶活性,这可能将为肿瘤生物治疗提供一条新的途径。
