【摘要】 目的:构建人肌球蛋白2v基因启动子(pMLC2v)驱动的绿色荧光蛋白(GFP)和萤光素酶(Luc)报告基因慢病毒载体并观察其在人心肌细胞系(HCM)和人肺癌细胞株A549中的整合表达特征。方法:应用去毒化的人类I型免疫缺陷病毒和pMLC2v-GFP或pMLC2v-Luc报告基因构建慢病毒示踪载体,转染HCM和A549细胞,激光共聚焦显微镜及生物发光检测仪观察2种报告基因在不同细胞生长进程中的表达特征。非特异性启动子驱动的GFP(GFPC)和红色荧光蛋白(RFPC)报告基因作为对照。结果:2种细胞转染GFPC和RFPC后第3 d,都表达GFP和RFP;而HCM只在转染pMLC2v-GFP和pMLC2v-Luc 21 d后表达GFP和Luc,A549细胞不表达。结论:pMLC2v主要在培养21 d后新增殖的人心肌细胞中驱动GFP和Luc报告基因表达,这为监测干细胞向心肌细胞的分化进程提供了可靠的病理及活体示踪工具。更多还原

【Abstract】 AIM: To construct the lentiviral vectors with green fluorescent protein(GFP) and luciferase(Luc) reporter genes driven by human myosine light chain 2v gene promoter(pMLC2v) and to investigate their expression in human cardiomyocyte(HCM) cell line and human lung cancer cell line A549.METHODS: Human pMLC2v-specific lentiviral vectors with GFP(pMLC2v-GFP) or Luc(pMLC2v-Luc) were constructed and transfected into HCM and A549 cell lines.The expression characteristics of the reporter genes were observed by confocal fluorescent microscopy and bioluminescence detection.Common(nonspecific) promoter-driven GFP(GFPC) or red fluorescent protein(RFPC) lentiviral vectors were used as controls.RESULTS: Both cell lines expressed GFP and RFP 3 days after transfected with the nonspecific vectors.HCM specifically expressed GFP and Luc 3 weeks after transfected with the pMLC2v-GFP or pMLC2v-Luc vectors.However,A549 cells didn’t show the similar expression pattern.CONCLUSION: The pMLC2v-GFP and pMLC2v-Luc lentiviral vectors are specific for newly proliferative cardiomyocytes,indicating that they can be used as reliable tools for tracking the differentiation of stem cells into cardiomyocytes in vivo.更多还原