BK channels and a new form of hypertension.

BK channels and a new form of hypertension.
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DOI:
10.1038/ki.2010.272
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发表时间:
2010-11
影响因子:
19.6
通讯作者:
Sansom, Steven C.
Sansom, Steven C.
中科院分区:
医学1区
文献类型:
--
作者:
Grimm, P. Richard;Sansom, Steven C.

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大的钙激活钾通道(BK)由一个α孔(BKα)和四个β亚基之一(BKβ1-4)组成。当BKβ1基因被敲除(BKβ1-KO)时,结果是血管平滑肌的肌源性张力增加和高血压。我们重新检查了高血压是否完全是由于血管张力增加,因为大多数单基因型高血压都有肾脏起源,BKβ1存在于肾脏连接小管(CNT)细胞中。此外,BKβ1位于肾上腺中,在那里它可以控制醛固酮的产生。本文将总结我们的报告,即BKβ1-KO的高血压大多数是由于饮食中钾处理不足,导致血浆钾升高和醛固酮增多症,后者促进钠和液体潴留。高钾饮食可加重液体潴留和高血压,依普利酮(一种醛固酮受体抑制剂)可减轻液体潴留和高血压。存在于闰细胞中的BKβ4的基因敲除(BKβ4-KO)也表现出钾排泄不足、液体潴留和轻度高血压,当动物接受高钾饮食治疗时,这种情况不会加剧。这些结果表明,与BKβ1-KO相关的高血压的发生是由于增加的液体潴留以及先前描述的血管功能障碍。
Large, Ca-activated K channels (BK) are comprised of an alpha pore (BKα) and one of four beta subunits (BKβ1-4). When the gene for BKβ1 is knocked out (BKβ1-KO) the result is increased myogenic tone of vascular smooth muscle and hypertension. We re-examined whether the hypertension is entirely due to increased vascular tone because most monogenic forms of hypertension have renal origins and BKβ1 resides in renal connecting tubule (CNT) cells. Moreover, BKβ1 is localized in the adrenal glands where it may control production of aldosterone. This review will summarize our report that a majority of the hypertension of BKβ1-KO is the result of insufficient handling of dietary K, resulting in increased plasma K and hyperaldosteronism, the latter promoting Na and fluid retention. The fluid retention and hypertension are exacerbated by a high K diet and reduced by eplerenone, an aldosterone receptor inhibitor. Genetic knock out of the BKβ4 (BKβ4-KO), which resides in intercalated cells, also exhibit deficient K excretion, fluid retention and mild hypertension that is not exacerbated when animals are treated a high K diet. These results show that the hypertension associated with BKβ1-KO occurs because of enhanced fluid retention as well as the previously described vascular dysfunction.
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发表时间: 2009-07-14
影响因子: 11.1
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