通心络下调caspase-3蛋白表达及活性抑制软脂酸诱导的人外周血内皮祖细胞凋亡

目的:探讨通心络(tongxinluo,TXL)对软脂酸(palmitic acid,PA)诱导的人外周血内皮祖细胞(endothelialprogenitor cell,EPCs)凋亡及caspase-3蛋白表达和活性的影响。方法:密度梯度离心法获取人外周血单个核细胞,培养7d后,贴壁细胞分成7组:对照组以M199培养液培养48h;PA各浓度组(共3组)分别用含200,400,800μmol/L PA的M199培养液孵育48h;通心络干预组(共3组)分别先用含100,200,400μmol/L TXL的M199培养液干预2h后,再加入400μmol/L PA孵育48h。采用流式细胞仪检测细胞凋亡率;提取细胞蛋白,采用Westernblot技术检测caspase-3蛋白表达水平;采用分光光度法检测caspase-3蛋白活性水平。结果:PA呈浓度依赖性诱导EPCs凋亡;加入TXL干预,EPCs细胞凋亡率明显降低;Western blot和分光光度法检测显示,PA组EPCs的caspase-3蛋白表达及活性明显高于对照组,200和400μmol/L TXL干预组明显低于PA组(P0.05)。结论:PA呈浓度依赖性诱导EPCs凋亡,TXL能部分抑制PA的上述作用,其机制与下调caspase-3蛋白表达及活性有关。

Tongxinluo inhibits palmitic acid-induced apoptosis of human endothelial progenitor cells by down-regulating expression and activity of caspase-3 protein

AIM:To explore the effect of tongxinluo(TXL)on apoptosis,expression and activity of caspase-3 in palmitic acid(PA)-induced peripheral blood-derived human endothelial progenitor cells in vitro.METHODS:Total mononuclear cells were isolated from peripheral blood in vitro by Ficoll density gradient centrifugation and plated on fibronectin-coated culture dishes.After 7 days,the attached cells were divided into seven groups:one control group(normal cells),three PA groups [attached cells were incubated with differ...