Bcl-2和PCNA表达在大鼠成肌细胞氧化应激损伤中的作用

摘要

目的:探讨Bcl-2、PCNA等蛋白表达在成肌细胞氧化应激损伤中的意义.方法:将对数生长期成肌细胞进行分组,结合碱性成纤维细胞生长因子(bFGF)预处理2 h及过氧化氢处理,分为正常对照(control)组、单纯bFGF组、氧化应激组(H2O2组)和干预组(bFGF+H2O2组).免疫组化检测Bcl-2和Bax阳性沉积颗粒;免疫荧光观察成肌细胞形态及Bcl-2和Bax荧光表达;Western blot检测Bcl-2、PCNA等蛋白表达情况.结果:免疫荧光及免疫组化结果显示,与氧化应激组比较,干预组Bcl-2表达增加,Bax表达减少;Western blot显示,干预组Bcl-2和PCNA水平增加,Bax水平降低.结论:氧化应激诱导的大鼠成肌细胞损伤参与肌细胞病理进程.Bcl-2和PCNA表达上调可减轻成肌细胞损伤程度.%AIM:To explore the role of Bcl-2 and PCNA expression in the injury of rat myoblasts induced by hydrogen peroxide (H2O2).METHODS:Rat myoblasts at growth phase were divided into 4 groups based on basic fibroblast growth factor (bFGF) and H2O2 levels:normal control group, bFGF group, model group (H2O2 group) and treatment group (bFGF+H2O2 group).The expression of Bcl-2 and Bax was observed by immunohistochemistry and fluorescence methods.The protein levels of Bax, Bcl-2 and PCNA were determined by Western blot.RESULTS:Compared with model group, both immunofuorescence and fluorescence in treatment group showed enhanced Bcl-2 and low expression of Bax.Furthermore, the results of Western blot showed up-regulated PCNA and Bcl-2 protein and decreased Bax expression in treatment group.CONCLUSION:Oxidative stress results in the pathologic changes of myoblasts, and the up-regulation of Bcl-2 and PCNA may attenuate myoblast injury.