Dietary salt promotes neurovascular and cognitive dysfunction through a gut-initiated TH17 response.

Dietary salt promotes neurovascular and cognitive dysfunction through a gut-initiated TH17 response.
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DOI:
10.1038/s41593-017-0059-z
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发表时间:
2018-03
影响因子:
25
通讯作者:
Iadecola C
Iadecola C
中科院分区:
医学1区
文献类型:
--
作者:
Faraco G;Brea D;Garcia-Bonilla L;Wang G;Racchumi G;Chang H;Buendia I;Santisteban MM;Segarra SG;Koizumi K;Sugiyama Y;Murphy M;Voss H;Anrather J;Iadecola C

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富含盐的饮食与脑血管疾病和痴呆症的风险增加有关,但目前尚不清楚饮食中的盐如何损害大脑。我们报告,在小鼠中,过量的饮食盐抑制静息脑血流和内皮功能,导致认知障碍。该效应取决于小肠中TH 17细胞的扩增,导致血浆白细胞介素-17(IL-17)的显著增加。循环IL-17反过来通过Rho激酶依赖性抑制性磷酸化内皮一氧化氮合酶和减少脑内皮细胞中的一氧化氮产生来促进内皮功能障碍和认知障碍。这些发现揭示了一个新的肠-脑轴,通过肠道启动的适应性免疫反应,通过循环IL-17损害脑功能,将饮食习惯与认知障碍联系起来。因此,TH 17细胞-IL-17途径是对抗由膳食盐和与TH 17极化相关的其他疾病诱导的有害脑效应的推定靶标。
A diet rich in salt is linked to an increased risk of cerebrovascular diseases and dementia, but it remains unclear how dietary salt harms the brain. We report that, in mice, excess dietary salt suppresses resting cerebral blood flow and endothelial function, leading to cognitive impairment. The effect depends on expansion of TH17 cells in the small intestine, resulting in a marked increase in plasma interleukin-17 (IL-17). Circulating IL-17, in turn, promotes endothelial dysfunction and cognitive impairment by the Rho kinase-dependent inhibitory phosphorylation of endothelial nitric oxide synthase and reduced nitric oxide production in cerebral endothelial cells. The findings reveal a new gut-brain axis linking dietary habits to cognitive impairment through a gut-initiated adaptive immune response compromising brain function via circulating IL-17. Thus, the TH17 cell-IL-17 pathway is a putative target to counter the deleterious brain effects induced by dietary salt and other diseases associated with TH17 polarization.
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