钙敏感受体在缺氧复氧大鼠心肌细胞凋亡中的作用

目的:观察钙敏感受体(CaSR)在乳鼠心肌细胞缺氧复氧损伤模型中对细胞凋亡的影响.方法:利用原代培养的SD乳鼠心肌细胞建立缺氧复氧损伤(H/R)模型,分正常对照组、缺氧复氧组、激动剂组、阻断剂组、肝细胞生长因子(HGF)小(10 ng/m1)、中(20 ng/m1)大剂量(40 ng/ml)组.运用TUNEL染色方法检测心肌细胞凋亡率,RT-PCR检测心肌细胞肿瘤坏死因子(TNF-α)的表达,乳酸脱氢酶(LDH)试剂盒测定培养液LDH含量.结果:与对照组相比,H/R组细胞凋亡率、LDH和TNF-α表达增高(p<0.01),给予CaSR激动剂后这三者的表达均进一步升高(P<0.01).而给予阻断剂后这三者的表达与激动剂组相比,差别无统计学意义(P>0.05),而HGF小、中和大剂量组这三者的表达较阻断剂绢进一步下降,且呈剂量依赖性.结论:CaSR激活后可能通过引起细胞内钙超载、自由基产生增多、TNF-α等炎性因子合成增多,参与了心肌缺血再灌注损伤,促进心肌细胞凋亡.而HGF预处理可以明显降低缺血再灌注心肌细胞的凋亡,减轻缺氧复氧心肌细胞损伤,保护心肌,且呈量效关系.

Role of calcium sensing receptor in apoptosis of rat cardiomyocyte induced by hypoxia/reoxygenation

Objective:To observe the role of calcium sensing receptor(CaSR) in apoptosis of rat cardiomyocyte induced by hypoxi- a / reoxygenation (H / R). Methods:After myocardial hypoxia / reoxygenation model was established by culturing primary myocardial cell of neonatal rat in vivo. The myocardial cells were divided into seven groups, the control group,H / R group,calcimimetic group (Ldcl3 group),inhibitor group,small-(10 ng / ml),middle-(20 ng / ml) and large-dose (40 ng / ml) of hepatocyte growth factor(HGF) gro...