AMP-Activated Protein Kinase Attenuates High Salt-Induced Activation of Epithelial Sodium Channels (ENaC) in Human Umbilical Vein Endothelial Cells.

AMP-Activated Protein Kinase Attenuates High Salt-Induced Activation of Epithelial Sodium Channels (ENaC) in Human Umbilical Vein Endothelial Cells.
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AMP 激活的蛋白激酶可减弱人脐静脉内皮细胞中高盐诱导的上皮钠通道 (ENaC) 的激活。

DOI:
10.1155/2016/1531392
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发表时间:
2016
影响因子:
--
通讯作者:
Zhang ZR
Zhang ZR
中科院分区:
生物学2区
文献类型:
--
作者:
Zheng WW;Li XY;Liu HB;Wang ZR;Hu QQ;Li YX;Song BL;Lou J;Wang QS;Ma HP;Zhang ZR

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最近的研究表明,上皮钠通道(ENaC)在内皮细胞中表达。为了测试高盐是否通过调节内皮ENaC影响NO产生,将人脐静脉内皮细胞(HUVEC)在含有正常或高钠(另外20 mM NaCl)的溶液中孵育。我们的数据显示高钠处理显著增加HUVECs中α-、β-和γ-ENaC的表达水平。采用细胞贴附式膜片钳技术,我们证明高钠处理显著增加ENaC开放概率(PO)。此外,一氧化氮合酶(eNOS)的磷酸化(Ser 1177)水平和NO的产生显着降低高钠在HUVECs;高钠对eNOS磷酸化和NO的产生的影响被一个特定的ENaC阻断剂,阿米洛利抑制。我们的研究结果表明,高钠降低内皮细胞中AMP激活激酶(AMPK)的磷酸化。另一方面,二甲双胍,一种AMPK激活剂,阻止高钠诱导的ENaC表达和PO的上调。此外,二甲双胍防止高盐诱导的NO产生和eNOS磷酸化的减少。这些结果表明,高钠刺激ENaC激活通过负性调节AMPK活性,从而导致内皮细胞中eNOS活性和NO产生的减少。
Recent studies suggest that the epithelial sodium channel (ENaC) is expressed in the endothelial cells. To test whether high salt affects the NO production via regulation of endothelial ENaC, human umbilical vein endothelial cells (HUVECs) were incubated in solutions containing either normal or high sodium (additional 20 mM NaCl). Our data showed that high sodium treatment significantly increased α-, β-, and γ-ENaC expression levels in HUVECs. Using the cell-attached patch-clamp technique, we demonstrated that high sodium treatment significantly increased ENaC open probability (P O). Moreover, nitric oxide synthase (eNOS) phosphorylation (Ser 1177) levels and NO production were significantly decreased by high sodium in HUVECs; the effects of high sodium on eNOS phosphorylation and NO production were inhibited by a specific ENaC blocker, amiloride. Our results showed that high sodium decreased AMP-activated kinase (AMPK) phosphorylation in endothelial cells. On the other hand, metformin, an AMPK activator, prevented high sodium-induced upregulation of ENaC expression and P O. Moreover, metformin prevented high salt-induced decrease in NO production and eNOS phosphorylation. These results suggest that high sodium stimulates ENaC activation by negatively modulating AMPK activity, thereby leading to reduction in eNOS activity and NO production in endothelial cells.
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