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远程预处理通过下调钙网蛋白高表达减轻在体大鼠心肌细胞缺血再灌注损伤 被引量:5

Remote preconditioning provides myocardial protection against myocardial ischemia/reperfusion injury through downregulating the expression of calreticulin in rats
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摘要 目的:研究远程预处理(remote preconditioning,RP)对在体缺血再灌注心肌的保护作用,探讨钙网蛋白(calreticulin,CRT)在远程预处理心肌细胞缺血再灌注(ischemia reperfusion,IR)损伤的作用。方法:30只成年SD大鼠,随机分成5组(n=6),分别为缺血再灌注组、缺血预处理组、远程预处理Ⅰ组、远程预处理Ⅱ组和假手术组。建立大鼠在体缺血再灌注损伤模型,观察各组缺血再灌注前后心功能变化,并检测再灌注末血清肌钙蛋白T(cardiac troponin T,cTnT)、丙二醛(malondialdehyde,MDA)、超氧化物歧化酶(superoxide dismutase,SOD)的变化以及心肌组织钙网蛋白的表达。结果:远程预处理Ⅰ组心功能、cTnT、MDA、SOD值、CRT的表达与缺血再灌注组无显著差异(P>0.05);缺血预处理组、远程预处理Ⅱ组SOD值均显著高于缺血再灌注组(P<0.05),cTnT、MDA值、CRT的表达均显著低于缺血再灌注组(P<0.05)。结论:远程预处理可以模拟缺血预处理的心肌保护作用;远程预处理可能通过下调钙网蛋白高表达减轻在体大鼠心肌细胞缺血再灌注损伤。 AIM : To evaluate the role of calreticulin (CRT) in myocardial protection of remote preconditioning against myocardial ischemia/reperfusion injury. METHODS: Thirty SD rats were randomly divided into 5 groups: ischemia reperfusion group (IR), ischemia preconditioning group (IP), remote preconditioning group I (RPI), remote preconditioning group Ⅱ (RPII) and pseudo-operation group (PO). The ischemia/reperfusion model was established in vivo. Hemodynamic changes of heart function were observed. Serum cardiac troponin T (cTnT) , superoxide dismutase (SOD), malondialdehyde (MDA) and the expression of calreticulin in myocardium were detected. RESULTS: Hemody- namic data, serum cTnT, DA, SOl) and the expression of CRT in RPI and IR group were not statistically different (P 〉 0. 05). SOD level in IP and RPII group was higher than that in IR group (P 〈 0. 05). Accordingly, cTnT, MDA and the expression of CRT in these two groups were lower than those in IR group (P 〈 0. 05). CONCLUSION : Remote precondi- tioning may mimic the protective effect of ischemic preconditioning. Remote preconditioning attenuates myocardial ischemia/reperfusion injury in vivo possibly through down - regulation of CRT expression in rats.
出处 《中国病理生理杂志》 CAS CSCD 北大核心 2009年第8期1469-1473,共5页 Chinese Journal of Pathophysiology
基金 国家杰出青年科学基金资助项目(No.30525020) 教育部博士点基金资助项目(No.20050558050) 人事部留学人员资助项目(No.粤人发2006 -11) 广东省省科技厅国际合作资助项目(No.2007B050200024) 广东省卫生厅基金资助项目(No.B2007038 No.A2008173)
关键词 远程预处理 缺血预处理 再灌注损伤 钙网蛋白 心肌细胞 Remote preconditioning Ischemic preconditioning Reperfusion injury Calreticulin Cardiomyocytes
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