Na+-sensitive elevation in blood pressure is ENaC independent in diet-induced obesity and insulin resistance.

Na+-sensitive elevation in blood pressure is ENaC independent in diet-induced obesity and insulin resistance.
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Na 敏感性血压升高在饮食引起的肥胖和胰岛素抵抗中与 ENaC 无关。

DOI:
10.1152/ajprenal.00265.2015
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发表时间:
2016
期刊:
American journal of physiology. Renal physiology
影响因子:
--
通讯作者:
Bhalla,Vivek
Bhalla,Vivek
中科院分区:
--
文献类型:
--
作者:
Nizar,JonathanM;Dong,Wuxing;McClellan,RobertB;Labarca,Mariana;Zhou,Yuehan;Wong,Jared;Goens,DonaldG;Zhao,Mingming;Velarde,Nona;Bernstein,Daniel;Pellizzon,Michael;Satlin,LisaM;Bhalla,Vivek

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大多数患有肥胖、胰岛素抵抗和代谢综合征的患者都有高血压,但高血压的机制尚不清楚。在这些患者中,钠排泄障碍在钠敏感性高血压的发生中起关键作用,先前的研究表明上皮性钠离子通道(ENaC)在这种综合征中起到了作用。我们以高脂喂养的小鼠为模型,研究ENaC介导的Na+重吸收在肥胖和胰岛素抵抗中的作用。高脂饮食的小鼠表现出Na+排泄障碍和血压升高,与低脂饮食的对照组小鼠相比,高Na+饮食的小鼠血压显著升高。然而,高脂肪喂养的小鼠的ENaC活性并没有增加,这是通过Na+跨微灌流皮质收集管的运输、电解质排泄或血压来衡量的。此外,我们还发现,在正常或高钠饮食组之间,内源性尿醛固酮排泄量没有差异。高脂喂养的小鼠提供了一种代谢综合征、重复性肥胖、胰岛素抵抗、钠尿受损以及对钠离子敏感的血压升高的模型。令人惊讶的是,与之前的研究相反,我们的数据表明,高脂肪喂养小鼠会损害钠尿,并产生独立于ENaC活性的血压升高,可能是由于对醛固酮敏感的远端肾单位上游Na+重吸收增加所致。
The majority of patients with obesity, insulin resistance, and metabolic syndrome have hypertension, but the mechanisms of hypertension are poorly understood. In these patients, impaired sodium excretion is critical for the genesis of Na+-sensitive hypertension, and prior studies have proposed a role for the epithelial Na+channel (ENaC) in this syndrome. We characterized high fat-fed mice as a model in which to study the contribution of ENaC-mediated Na+reabsorption in obesity and insulin resistance. High fat-fed mice demonstrated impaired Na+excretion and elevated blood pressure, which was significantly higher on a high-Na+diet compared with low fat-fed control mice. However, high fat-fed mice had no increase in ENaC activity as measured by Na+transport across microperfused cortical collecting ducts, electrolyte excretion, or blood pressure. In addition, we found no difference in endogenous urinary aldosterone excretion between groups on a normal or high-Na+diet. High fat-fed mice provide a model of metabolic syndrome, recapitulating obesity, insulin resistance, impaired natriuresis, and a Na+-sensitive elevation in blood pressure. Surprisingly, in contrast to previous studies, our data demonstrate that high fat feeding of mice impairs natriuresis and produces elevated blood pressure that is independent of ENaC activity and likely caused by increased Na+reabsorption upstream of the aldosterone-sensitive distal nephron.
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