【摘要】 目的:观察钙敏感受体(CaSR)在大鼠心肌缺血/再灌注时的表达变化,揭示其与心肌缺血/再灌注损伤的关系。方法:Wistar大鼠随机分为5组:假手术组(sham组)、缺血再灌注1、2、4和6h组(I/R1h、2h、4h、6h组)。采用冠状动脉结扎和松结的方法,复制大鼠在体心肌缺血/再灌注损伤模型,记录左室收缩压(LVSP)和左室内压最大变化速率(±dp/dtmax),测定血清LDH、SOD活性和MDA含量,透射电镜观察心肌超微结构变化,RT-PCR法检测心肌组织中CaSR mRNA的表达变化。结果:LVSP、左室内压±dp/dtmax及SOD活性随再灌注时间延长而减低,LDH活性和MDA含量在再灌注2h时最高;心肌超微结构损伤在再灌注1h、2h较重,随再灌注时间延长而减轻;大鼠心肌缺血/再灌注1h、2h心肌组织CaSR的mRNA表达升高,再灌注4h、6h后降低。结论:CaSR mRNA表达多时心肌损伤较重,CaSR可能参与了心肌缺血/再灌注损伤。更多还原

【Abstract】 AIM: To investigate the expression of calcium sensing receptor(CaSR) during myocardial injury induced by ischemia/reperfusion and disclose the relationship between CaSR and myocardial ischemia/reperfusion. METHODS: The experimental model was established by the 30 min ligating and 1 h, 2 h, 4 h, 6 h reperfusing the left descending coronary artery (LAD) in rats. Wistar rats were randomly divided into 5 groups: sham group, ischemia/reperfusion 1 h, 2 h, 4 h, 6 h groups (I/R 1 h, 2 h, 4 h, 6 h group). CaSR mRNA expression was detected by RT-PCR. Left ventricular function was recorded. The levels of plasma lactate dehydrogenase (LDH), alondialdehyde (MDA) and superoxide dismutase (SOD) were measured. The change of ultrastructure in the ischemia/reperfusion myocardium of rats was observed by electron microscopy. RESULTS: LVSP,±dp/dtmax and SOD activity decreased gradually with the reperfusion time prolonged. LDH and MDA peaked at 2 h. The ultramicro-structural injury at the 1 h and 2 h was more serious than that at 4 h and 6 h. The expression of CaSR increased significantly after reperfusion of 1 h and 2 h, and decreased after 4 h and 6 h. CONCLUSION: The increased expression of CaSR mRNA and serious injure of myocardium were observed. CaSR may be associated with the myocardial ischemia/reperfusion injury.更多还原