11,12-EET和缺血预处置对在体大鼠正常及再灌注心肌磷酸化ERK和p38 MAPK表达的影响  

Effects of 11, 12-EET and ischemic preconditioning on phosphorylated ERK and p38 MAPK during ischemia and reperfusion in rat myocardium

作　　者：王红霞[1] 闫丽[1] 芦玲巧[1] 曾翔俊[1] 张立克[1] 

机构地区：[1]首都医科大学病理生理学教研室,北京100054

出　　处：《中国病理生理杂志》2004年第12期2194-2197,共4页Chinese Journal of Pathophysiology

基　　金：北京市自然科学基金资助项目(No.7962010)

摘　　要：目的观察11,12-环氧二十碳三烯酸(11,12-EET)和缺血预处置对大鼠再灌注心肌组织磷酸化ERK1/ERK2和p38MAPK表达的影响,了解大鼠心肌磷酸化ERK1/ERK2和p38MAPK表达与预处置有否关系。方法使用雄性Wistar大鼠,通过结扎(60min)和松开(30min)冠状动脉左前降支,复制缺血/再灌注模型;采用缺血5min,再灌注5min两次造成缺血预处置。大鼠经手术并静脉给予624×10-8mol/L11,12-EET,稳定20min,结扎冠脉复制缺血/再灌注模型。实验分5组①正常组(norm);②假手术组(sham);③缺血再灌注组(I/R);④短阵缺血预处置组(SI+I/R);⑤11,12-EET预处置缺血/再灌注组(EET+I/R)。采用Westernblot法测定心肌细胞外调节的蛋白激酶(ERK1/2)和p38MAPK的表达程度,并观察再灌注过程中心功能的变化。结果再灌注30min时,I/R组+dp/dtmax%、-dp/dtmax%和LVDP均显著低于sham组、SI+I/R组和EET+I/R组(P<005);而I/R组大鼠心肌ERK1/2磷酸化表达明显高于sham组(P<005),明显低于SI+I/R组和EET+I/R组(P<005);I/R组大鼠心肌p38MAPK磷酸化表达I/R组显著高于sham组、norm组、SI+I/R及EET+I/R组(P<005)。结论624×10-811,12-EETmol/L具有保护心功能的作用,这种保护作用可能与大量激活磷酸化ERK1/2和抑制p38MAPK有关。AIM: In order to study the relationship between the ERK and p38 MAPK activation and the protection of 11, 12-epoxyeicosatrienoic acid (11, 12-EET) and ischemia preconditioning (IP), the effects of 11, 12-EET and ischemic preconditioning on phosphorylated ERK and p38 MAPK during ischemia and reperfusion in rat myocardium were examined. METHODS: The rat heart was subjected to ischemia for 5 min by ligating the left anterior descending coronary artery followed by reperfusion for 5 min (two times) to undergo ischemia preconditioning. The rats were divided into 5 groups: (1) control; (2) sham group; (3) ischemia/reperfusion (I/R) group, in which the rat heart suffered from 60 min ischemia followed by 30 min reperfusion; (4) IP plus I/R group; (5) EET plus I/R group, in which 6.28×10 -8 mol/L 11, 12-EET was injected intravenously 20 min before I/R. The heart function was examined, and phosphorylated ERK and p38 MAPK were detected by Western blot. RESULTS: At 30 min reperfusion, +dp/dt max ,-dp/dt max and LVDP decreased significantly in I/R group compared with sham group, IP plus I/R group and EET plus I/R group; Phosphorylated ERK1/2 level was higher in I/R group than sham group, but was lower in I/R group than IP plus I/R group and EET plus I/R group; Phosphorylated p38 MAPK level was lower in control, sham, IP plus I/R and EET plus I/R group than I/R group. CONCLUSION: 11,12-EET protects rat heart against ischemia/reperfusion injury, the mechanism may be related to activation of ERK1/2 and inhibition of p38 MAPK. [

关 键 词：11 12-环氧二十碳三烯酸 缺血预处理 P38MAP激酶 

分 类 号：R363[医药卫生—病理学]