右美托咪定对氧糖剥夺再复氧下Huvecs的保护机制

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目的 探讨右美托咪定(DEX)预处理对氧糖剥夺再复氧条件下人脐静脉内皮细胞(Huvecs)的保护机制.方法 人工培养Huvecs,实验分为2部分,氧糖剥夺前细胞分3组:对照组(NC组)、DEX组、DEX+育亨宾(YHB)组.DEX组、DEX+YHB组加入50μmol/L的DEX和100μmol/L的YHB处理细胞2 h,DEX组加入50μmol/L的DEX处理细胞2 h.氧糖剥夺再复氧后细胞分为4组:对照组(NC组)、ogd/r组、DEX+ogd/r组、DEX+YHB+ogd/r组.DEX+ogd/r组加入50μmol/L DEX预处理2 h,DEX+YHB+ogd/r组加入50μmol/L DEX和100μmol/L YHB处理2 h,ogd/r组加入等体积的PBS,随后将3组细胞置于Hank\'s液中于缺氧恒温细胞培养箱内培养12 h,之后换正常培养基置于常氧恒温培养箱内培养4 h,NC组置于正常条件下培养18 h.采用Western blot检测各组Huvecs内部AMP依赖的蛋白激酶α(AMPKα)磷酸化水平,通过Seahorse能量分析检测缺氧复氧前各组Huvecs线粒体呼吸功能.结果 与NC组相比,DEX组线粒体基础氧耗速率升高(P<0.05),最大氧气消耗速率升高(P<0.05),线粒体三磷酸腺苷(ATP)产生能力升高(P<0.05);与DEX组相比,DEX+YHB组线粒体基础氧耗速率降低(P<0.05),最大氧气消耗速率降低(P<0.05),线粒体ATP产生能力降低(P<0.05);与ogd/r组相比,DEX+ogd/r组AMPKα磷酸化水平升高(P<0.05);与DEX+ogd/r组相比,DEX+YHB+ogd/r组AMPKα磷酸化水平降低(P<0.05).结论 DEX预处理激活AMPKα分子可提高Huvecs的线粒体呼吸功能,减轻氧糖剥夺再复氧条件下的损伤.
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