胰岛素样生长因子-1在病毒性心肌炎小鼠中的变化及对心肌的保护作用

目的 探讨病毒性心肌炎（VMC）小鼠血清胰岛素样生长因子-1（IGF-1）水平的变化及外源性IGF-1对凋亡相关蛋白Bcl-2和Bax表达的影响。方法 Balb／c雄性小鼠随机分为3组：正常对照组、柯萨奇B3病毒（CVB3）感染组（感染组）和病毒感染加IGF-1治疗组。分别在实验d7、d14处死动物，留取血清、心肌标本。放射免疫法检测血清IGF-1水平，免疫组织化学法检测心肌组织Bcl-2和Bax蛋白表达。结果 感染组血清IGF-1水平较对照组明显降低，Bcl-2表达减少、Bax表达增加（P〈0．01）；治疗组较感染组Bcl-2表达增加、Bax表达减少（P〈0．01）。结论 IGF-1对VM小鼠的心肌细胞有保护作用。

Changes of Insulin - Like Growth Factor - 1 in Mice with Viral Myocarditis and Their Protective Effects on Myocardium

Objective To determine the significance of change of insulin-like growth factor-1(IGF-1) and study the effect of IGF-1 on expression of Bcl-2 and Bax.Methods Male Balb/c mice were randomly divided into control group,coxsackie B3(CVB3) infection group(infection group),CVB3 infection with IGF-1 treated group.Animals were killed at d7,d14.The immunohistochemical studies and medical imagine analysis system were performed to evaluate the expression of Bcl-2 and Bax in myocardial tissue.Serum IGF-1 concentrations were assayed by radioimmunoassay(RIA).Results In infection group,the concentrations of IGF-1 were more decreased than that of control group and the expression of Bcl-2 reduced and Bax increased(P<0.01).As compared to infection group,the expression of Bcl-2 increased and Bax reduced in treated group(P<0.01).Conclusion IGF-1 may offer protection to cardiomyocyte of viral myocarditis in mice.