小凹蛋白-1在大鼠骨髓间质干细胞分化为神经元样细胞中的作用

目的 应用RNA干扰(RNA interference)技术,抑制沉默小凹蛋白-1(caveolin-1)基因的表达,观察小凹蛋白-1在骨髓间充质干细胞(MSCs)分化为神经元样细胞的作用.方法 构建大鼠caveolin-1 siRNA(small interfering RNA),然后传染大鼠MSCs,诱导分化并在倒置显微镜下进行形态学观察,用MTT比色法检测细胞存活率,采用免疫细胞化学染色法检测Nestin、 NSE(神经元标记物) 、GFAP(神经胶质细胞标记物)的表达,设诱导未传染组和传染对照组作为对照研究.结果 用caveolin-1 siRNA传染MSCs后,caveolin-1基因表达消失,传染后24 h和3 d MSCs细胞存活率下降,与诱导未传染组和传染对照组比较差异有统计学意义(P<0.01),传染caveolin-1 siRNA的MSCs向神经元样细胞分化效率显著提高,诱导24 h后NSE阳性细胞率为(75.5±2.5)%,6 d后达(81.6±3.5)%,且未见GFAP的表达,与诱导未传染组和传染对照组比较差异有统计学意义(P<0.01).结论 caveolin-1 siRNA抑制caveolin-1基因的表达,可提高MSCs向神经元样细胞的分化效率. Abstract： Objective To investigate the role of caveolin-1 in bone marrow mesenchymal stem cells(MSCs) differentiating into neuron-like cells by transfecting MSCs with small interfering RNA(siRNA). Methods Construct caveolin-1 siRNA and then transfect into MSCs cultured in vitro. Cell growth was observed by an inverted phase contrast microscope. The survival ratio of MSCs was determined by MTT before transfection,24 hour, 3 days after transfection,respectively. MSCs was induced to differentiate into neuron-like cells by-ME. The neural cell specific marker Nestin,NSE,GFAP were determined by immunocytochemistry stain technique. Results Expresion of caveolin-1 vanished by tranfection of caveolin-1 siRNA,survival ratio of MSCs by transfection decreased and there was significant differences between no-transfection and transfection-controlling group after 24 hours and 3 days of transfection(P<0.01).The differentiation efficiency of MSCs transfected by caveolin-1 siRNA into neuron-like cells and the expression of NSE were increased significantly than no-transfection and transfection-controlling group, The percentage of positive NSE was(75.5±2.5)% after 24 hours and(81.6±3.5)% after 6 days, there was no expression of GFAP. There was significant differences between no-transfection and transfection-controlling group(P<0.01). Conclusions The differentiation efficiency of MSCs increased by suppressing caveolin-1 expression.

Effect of caveolin-1 on differentiation of rat bone marrow messenchymal stem cells into neuron-like cells

Marrow mesenchymal stem cells Neuron-like cells Caveolin-1 RNA interfering