【摘要】 目的构建PDX-1绿色荧光蛋白融合表达载体,电穿孔转染入大鼠胎肝干细胞以得到稳定表达。方法从SK900/BLSCRIPT质粒中扩增PDX-1,将其插入pEGFP-C1的多克隆位点中,构建重组质粒pEGFP-C1-PDX-1;分离培养大鼠胎肝干细胞,经鉴定后用电穿孔法转染;分析转染前后细胞生长曲线,荧光显微镜下观察、RT-PCR鉴定转染结果。结果重组质粒经酶切鉴定正确无误,经电穿孔转染后GFP和PDX-1基因均能在胎肝干细胞中保持较长时间稳定表达,并对胎肝干细胞的生长增殖影响较小。结论成功构建了PDX-1绿色荧光蛋白融合表达载体,能在胎肝干细胞中较稳定表达,为研究PDX-1在干细胞定向分化为胰岛素分泌细胞中的调控作用提供了物质基础。更多还原

【Abstract】 Objective To construct the fusion expression vector of pancreatic-duodenal homeobox gene 1 (PDX-1) fused to green fluorescent protein (GFP) capable of stable expression in fetal rat hepatic stem cells after tranfection by electroporation. Methods PDX-1 cDNA was amplified from SK900/BLSCRIPT plasmid and cloned into the multiple cloning site of pEGFP-C1 to obtain the recombined plasmid pEGFP-C1-PDX-1. Rat fetal hepatic stem cells were isolated, cultured, identified and transfected with the recombinant vector by electroporation, followed by observation of these cells with fluorescent microscope. The result of transfection was analyzed by RT-PCR and cell growth curve. Results Identification by enzyme digestion confirmed successful construction of the recombinant vector. Fetal hepatic stem cells can stably express GFP and PDX-1 for a period of time, and their growth and proliferation was not obviously affected after transfection. Conclusion The fusion expression vector of EGFP-PDX-1 is successfully constructed and stably expressed in rat fetal hepatic stem cells, which may facilitate the study of the role of PDX-1 in stem cell differentiation into insulin-producing cells.更多还原