【摘要】 目的:应用分子生物学技术,构建胰腺十二指肠同源框蛋白1(Pdx1)和神经分化因子1(NeuroD1)转录因子真核表达质粒,检测其能否在真核细胞中有效表达并诱导人肝细胞转分化的能力。方法:以人胚胎胰腺组织mRNA为模板经RT-PCR扩增获得Pdx1和NeuroD1基因,分别克隆到真核双表达载体pIRES质粒的多克隆位点A(MCSA)和B(MCSB)中,构建pI/Pdx1/NeuroD1真核表达质粒,并转染L02细胞。用RT-PCR、免疫组化、间接荧光法和Western blotting检测目的基因及NK转录因子相关的Nkx6.1(Nkx6.1)和葡萄糖运载体2(GLUT2)的表达情况。结果:目的基因克隆正确且在真核细胞中有效表达;并可诱导肝细胞表达胰腺β细胞功能相关的Nkx6.1和GLUT2因子。结论:pI/Pdx1/NeuroD1质粒成功构建和在人真核细胞表达,并诱导人肝细胞表达β细胞功能相关的Nkx6.1转录因子和GLUT2,提示Pdx1与NeuroD1可诱导肝细胞向胰腺内分泌细胞分化。更多还原

【Abstract】 AIM: To construct a recombinant plasmid vector containing human pancreatic duodenal homeobox1(Pdx1) and neurogenic differentiation 1(NeuroD1) genes,and to detect its effective expression in eukaryocytes and the ability to induce differentiation of hepatocytes.METHODS: Using human embryo pancreas mRNA as template,Pdx1 and NeuroD1 genes were amplified by RT-PCR and cloned into the two different multiple cloning sites(MCSA and MCSB) of plasmid pIRES.The recombinant plasmid pI/Pdx1/NeuroD1 was transfected into L02 cells.The expression of Pdx1 and NeuroD1 in transfected cells was detected by immunocytochemistry,IFA,RT-PCR and Western blotting,respectively.RESULTS: The length and sequence of cloned segments were correct.Pdx1 and NeuroD1 were expressed in eukaryocytes.Furthermore,the hepatic cells were induced to express glucose transporter 2(GLUT2) and eukaryocyte transcription factor Nkx6.1,which were functionally correlated to β cells.CONCLUSION: pI/Pdx1/NeuroD1 plasmid is successfully constructed and expressed in human eukaryocytes,with which the cells express the eukaryocyte transcription factor and GLUT2,indicating the transfected cells functionally correlates to β cells.The results suggest that Pdx1 and NeuroD1 genes can induce the differentiation the cells from hepatic cells to pancreatic endocrine secretion cells.更多还原