JCEM:GSTA1表达与KCNJ5突变的肾上腺醛固酮腺瘤患者醛固酮水平的关系

2017-11-22 MedSci MedSci原创

大家都知道KCNJ5突变是醛固酮腺瘤(APA)的一个主要原因,然而目前除此原因之外的研究却很少。2017年11月21日在JCEM上发表的一篇文章则研究了除KCNJ5之外的影响醛固酮分泌的机制。

大家都知道KCNJ5突变是醛固酮腺瘤(APA)的一个主要原因,然而目前除此原因之外的研究却很少。2017年11月21日在JCEM上发表的一篇文章则研究了除KCNJ5之外的影响醛固酮分泌的机制。

该研究纳入了6对KCNJ5突变、高和低醛固酮分泌的AP,5例非KCNJ5突变突变的APAs及4例正常的肾上腺组织,利用Affymetrix人类转录组阵列2.0分析。总共113个APA样本用于研究谷胱甘肽硫转移酶A1(GSTA1)的表达,利用H295R细胞确定GSTA1的功能。

研究结果显示GSAT1是在高醛固酮KCNJ5突变的APAs患者中最下调的基因。与野生型KCNJ5 APAs相比,KCNJ5突变的APAs患者其GSTA1也是下调的。因此,KCNJ5突变减少了GSTA1的mRNA及蛋白表达水平。无论是在野生型还是突变的KCNJ5细胞中,GSAT1过表达抑制了醛固酮的分泌。加入依他尼酸或沉默GSAT1的表达可以通过增加活性(ROS)、超氧化物、过氧化氢水平及钙内流使得醛固酮分泌增加。抑制GSTA1后转录因子NR4A1、NR4A2及CAMK1和细胞内的钙的表达显着提高。在GSTA1被抑制的细胞中,NADPH氧化酶抑制剂、过氧化氢清除剂及受阻钙通道能够显着减少醛固酮的分泌。

由上述研究我们可以得出如下结论:(1)GSTA1表达与KCNJ5突变的APAs患者的醛固酮水平呈负相关;(2)GSTA1通过ROS及钙信号调节醛固酮分泌;(3)KCNJ5突变下调了GSTA1的表达,而GSTA1过表达可逆转KCNJ5突变的肾上腺细胞中增高的醛固酮。

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    2018-01-25 smallant2015
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    2018-05-28 achengzhao
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    2017-11-24 cmsvly