促红细胞生成素对大鼠再灌注心律失常的影响

目的 观察促红细胞生成素(EPO)对大鼠再灌注心律失常的影响,并对其机制进行初步探讨.方法 以左冠状动脉前降支(LAD)穿线结扎法制备心肌缺血模型,松开结扎线造成再灌注.45只SD大鼠随机分成5组:①假手术(SHAM)组、②缺血再灌注(IR)组、③磷脂酰肌醇-3-激酶(P13K)的高选择性阻断剂LY294002(LY)组、④促红细胞生成素(EPO)组和⑤促红细胞生成素+LY294002(EPO+LY)组.观察各组大鼠在整个缺血再灌注期间心律失常发生情况,进行室性心律失常评分;检测血清肌酸磷酸激酶同功酶MB(CK-MB)和肌钙蛋白l(cTnI)水平;以硫代巴比妥酸显色法测定心肌组织丙二醛(MDA)的含量;以黄嘌呤氧化酶法测定心肌组织超氧化物歧化酶(SOD)的含量.结果 EPO组的心律失常评分明显低于IR、LY和EPO+LY组,差异有统计学意义(P<0.05);EPO血清CK-MB和cTnI水平组明显低于于IR、LY和EPO+LY组(P<0.001);EPO组SOD含量明湿高于IR、LY和EP0+LY组,差异有统汁学意义(P<0.001);EPO组MDA含量明显低于IR、LY和EPO+LY组,差异有统计学意义(P<0.001).结论 EP0 1000mg/kg再灌注前给药能有效降低大鼠再灌注心律失常的发生率,但此作用可被预先给予的LY294002所减弱,其作用机制与抗氧化作用有关,PI3K/AKt通路参与其信号转导.

Effect of erythropoietin on reperfusion arrhythmias in rats

Objective To explore the effect of erythropoietin (EPO) on reperfusion arrhythmias in rats and identify the possible mechanism involved. Methods Forty-five SD rats were randomized into a sham-operated group and 4 cardiac ischemia/reperfusion (IR) injury groups, which were further divided into IR group, LY294002 group, EPO group, and EPO+LY294002 group. Cardiac IR injury was induced in the 4 IR injury groups by ligating the left anterior descending branch of the coronary artery (LAD) for 30 min followed by r...