辛伐他汀对大鼠心肌梗死后TNF-α、IL-6表达及心室重构的干预研究

摘要

Objective: To investigate the association between inflammatory cytokines and ventricular remodeling after acute myocardial infarction (AMI) in rats, and the effects of simvastain on inflammatory cytokines and ventricular remodeling after AMI thereof. Methods: After AMI was produced in female SD rats, the animals were divided into control group,simvastain group and sham-operated group. After transthoracic echocardiography, TNF-α, IL-6 and P Ⅲ NP of the serum and cardiac muscle were measured by radioimmunology technology. The comparative heart weight and infarct sizes were calculated.Results: Compared with the control group, the LVDd and LVDs decreased significantly (P ＜ 0.05), LVEF,LVFS and posterior wall thicking increased significantly (P ＜ 0.05) in simvastain group. The values of TNF-α, IL-6 and P Ⅲ NP increased significantly in simvastain and control group compared with those of sham-operated group(P ＜ 0.05 or P ＜ 0.01 ). The values ot TNF-α, IL-6 and pⅢ NP decreased significantly in simvastain group compared with those of the control group (P ＜ 0.05). The comparative heart weight and infarct size decreased significantly in simvastain group compared with those of the control group (P ＜ 0.05). Conclusion: Simvastain can ameliorate the ventricular remodeling and improve cardiac performance after AMI by restraining the overexpression of inflammatory cytokines.%目的:探讨炎性细胞因子与梗死后心室重构的关系,观察辛伐他汀对细胞因子以及心室重构的影响.方法:雌性SD大鼠建立急性心肌梗死(AMI)模型后随机分为辛伐他汀组、心梗对照组,另设假手术组.4周后二维超声心动图检测并计算心功能指标;放射免疫法测定血清及心肌组织Ⅲ型前胶原氨基末端肽(PⅢNP)及肿瘤坏死因子-α(TNF-α)、白细胞介素-6(IL-6)含量.处死动物计算心肌肥厚指数,心室切片染色后应用显微镜微机图像分析系统计算梗死面积.结果:与对照组相比,辛伐他汀组LVDd、LVDs显著降低(P＜0.05),LVEF、LVFS显著增加(P＜0.05).与假手术组相比,对照组、辛伐他汀组血清、心肌TNF-α、IL-6及血清PⅢNP含量增加(P＜0.05或P＜0.01);与对照组相比,辛伐他汀组血清TNF-α、IL-6及pⅢNP含量显著降低(均P＜0.05);与对照组非梗死区相比,辛伐他汀组非梗死区心肌TNF-α、IL-6含量显著降低(均P＜0.05).与假手术组相比,对照组、辛伐他汀组心脏相对质量明显增加(均P＜0.01).与对照组相比,辛伐他汀组心脏相对质量显著降低,梗死面积显著减少(均P＜0.05).结论:辛伐他汀降低AMI后TNF-α、IL-6的表达.改善了心室重构,抗炎作用可能是其机制之一.