Low Na, high K diet and the role of aldosterone in BK-mediated K excretion.

Low Na, high K diet and the role of aldosterone in BK-mediated K excretion.
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DOI:
10.1371/journal.pone.0115515
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发表时间:
2015
期刊:
影响因子:
3.7
通讯作者:
Sansom SC
Sansom SC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cornelius RJ;Wen D;Li H;Yuan Y;Wang-France J;Warner PC;Sansom SC

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在许多社会中,低钠、高钾饮食 (LNaHK) 与心血管 (CV) 疾病的低发病率相关。 LNaHK 的部分益处依赖于其利尿作用;然而,醛固酮 (aldo) 在利尿中的作用尚不清楚。 LNaHK 小鼠表现出肾 K 分泌增加,这取决于大的 Ca 激活 K 通道(BK-α 和辅助 BK-β4;BK-α/β4)。我们假设 aldo 通过增加 LNaHK 小鼠中 BK-α/β4 介导的 K 分泌而引起渗透性利尿。我们发现,与对照饮食(Con)小鼠相比,LNaHK 小鼠的血浆 aldo 浓度(P[aldo])升高了 10 倍。我们对 LNaHK 小鼠进行假手术 (sham)、肾上腺切除术 (ADX) 低醛替代 (ADX-LA) 或 ADX 高醛替代 (ADX-HA)。与假手术相比,ADX-LA 中的尿流量、钾排泄率、管内钾梯度 (TTKG) 以及 BK-α 和 BK-β4 表达均降低,但 ADX-HA 中没有差异。 BK-β4 敲除 (β4KO) 和 WT 小鼠在 ADX-LA 组中表现出相似的 K 清除率和 TTKG;然而,在假手术和ADX-HA中,β4KO的K清除率和TTKG低于WT。响应阿米洛利治疗,WT Con 中渗透压清除率增加,WT LNaHK 中渗透压清除率降低,β4KO LNaHK 中渗透压清除率不变。这些数据表明,LNaHK 小鼠的高 P[aldo] 对于产生 BK-α/β4 介导的 K 分泌的高速率是必要的,这产生渗透性利尿,可能有助于减少 CV 疾病。
A low Na, high K diet (LNaHK) is associated with a low rate of cardiovascular (CV) disease in many societies. Part of the benefit of LNaHK relies on its diuretic effects; however, the role of aldosterone (aldo) in the diuresis is not understood. LNaHK mice exhibit an increase in renal K secretion that is dependent on the large, Ca-activated K channel, (BK-α with accessory BK-β4; BK-α/β4). We hypothesized that aldo causes an osmotic diuresis by increasing BK-α/β4-mediated K secretion in LNaHK mice. We found that the plasma aldo concentration (P[aldo]) was elevated by 10-fold in LNaHK mice compared with control diet (Con) mice. We subjected LNaHK mice to either sham surgery (sham), adrenalectomy (ADX) with low aldo replacement (ADX-LA), or ADX with high aldo replacement (ADX-HA). Compared to sham, the urinary flow, K excretion rate, transtubular K gradient (TTKG), and BK-α and BK-β4 expressions, were decreased in ADX-LA, but not different in ADX-HA. BK-β4 knockout (β4KO) and WT mice exhibited similar K clearance and TTKG in the ADX-LA groups; however, in sham and ADX-HA, the K clearance and TTKG of β4KO were less than WT. In response to amiloride treatment, the osmolar clearance was increased in WT Con, decreased in WT LNaHK, and unchanged in β4KO LNaHK. These data show that the high P[aldo] of LNaHK mice is necessary to generate a high rate of BK-α/β4-mediated K secretion, which creates an osmotic diuresis that may contribute to a reduction in CV disease.
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