Aging Disease:Apelin通过AMPK依赖性通路改善了高糖引起的心肌细胞Cx43下调

2018-03-04 王子君 “ 罂粟花”微信号

apelin能够减弱高糖诱导的Cx43下调,部分通过AMPK途径改善缝隙连接功能的受损。

背景与目的

糖尿病是一种常见的代谢性疾病,可使心律失常的发生风险增加。研究显示,高血糖可改变缝隙连接蛋白的表达和缝隙连接重构,从而导致心律失常甚至猝死。缝隙连接蛋白43(Cx43)是构成心脏缝隙连接的主要蛋白,发现在高糖时下调,并抑制缝隙连接细胞间通信(GJIC)。此外,apelin是一种有益的脂肪因子,可增加小鼠和人胚胎干细胞中Cx43蛋白的表达。

方  法

本实验通过细胞转染和Western blotting技术观察CX43的表达情况。

结  果

我们发现在高糖时,Cx43蛋白表达降低,GJIC受损,而给予apelin48后可逆转。我们同时发现,apelin增加了正常血糖时的Cx43蛋白表达。实时PCR显示,apelin或高糖+apelin组的Cx43 mRNA在高糖环境下没有显着差异。有趣的是,我们发现在给予AMPK受体激动剂AICAR后,Cx43表达增加。通过siRNA-AMPKα1和siRNA-AMPKα2转染抑制AMPKα后,可消除apelin对Cx43的作用。

结  论

apelin能够减弱高糖诱导的Cx43下调,部分通过AMPK途径改善缝隙连接功能的受损。

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    2018-06-29 智智灵药
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    2018-04-01 feather89
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    2018-05-01 qindq
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    2018-03-06 一叶知秋
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    2018-03-04 wqkm

    ^_^^_^^_^

    0

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