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• W2944215902 abstract "It has previously been shown that high dietary salt impairs vascular function independent of changes in blood pressure. Rodent studies suggest that NADPH-derived reactive oxygen species mediate the deleterious effect of high salt on the vasculature, and here we translate these findings to humans. Twenty-nine healthy adults (34 ± 2 yr) participated in a controlled feeding study. Participants completed 7 days of a low-sodium diet (LS; 20 mmol sodium/day) and 7 days of a high-sodium diet (HS; 300 mmol sodium/day) in random order. All participants were salt resistant, defined as a ≤5-mmHg change in 24-h mean BP determined while on the LS and HS diets. Laser Doppler flowmetry was used to assess cutaneous vasodilation in response to local heating (42°C) during local delivery of Ringer’s ( n = 29), 20 mM ascorbic acid (AA; n = 29), 10 µM Tempol ( n = 22), and 100 µM apocynin ( n = 22). Additionally, endothelial cells were obtained in a subset of participants from an antecubital vein and stained for nitrotyrosine ( n = 14). Cutaneous vasodilation was attenuated by the HS diet compared with LS [LS 93.0 ± 2.2 vs. HS 86.8 ± 2.0 percentage of maximal cutaneous vascular conductance (%CVC max) ; P < 0.05] and was restored by AA during the HS diet (AA 90.7 ± 1.2 %CVC max ; P < 0.05 vs. HS). Cutaneous vasodilation was also restored with the local infusion of both apocynin ( P < 0.01) and Tempol ( P < 0.05) on the HS diet. Nitrotyrosine expression was increased on the HS diet compared with LS ( P < 0.05). These findings provide direct evidence of dietary sodium-induced endothelial cell oxidative stress and suggest that NADPH-derived reactive oxygen species contribute to sodium-induced declines in microvascular function. NEW & NOTEWORTHY High-sodium diets have deleterious effects on vascular function, likely mediating, in part, the increased cardiovascular risk associated with a high sodium intake. Local infusion of apocynin and Tempol improved microvascular function in salt-resistant adults on a high-salt diet, providing evidence that reactive oxygen species contribute to impairments in microvascular function from high salt. This study provides insight into the blood pressure-independent mechanisms by which dietary sodium impairs vascular function. Listen to this article’s corresponding podcast at https://ajpheart.podbean.com/e/dietary-sodium-oxidative-stress-and-microvascular-function/ ." @default.
• W2944215902 created "2019-05-16" @default.
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• W2944215902 date "2019-07-01" @default.
• W2944215902 modified "2023-10-12" @default.
• W2944215902 title "Apocynin and Tempol ameliorate dietary sodium-induced declines in cutaneous microvascular function in salt-resistant humans" @default.
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• W2944215902 doi "https://doi.org/10.1152/ajpheart.00786.2018" @default.
• W2944215902 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6692730" @default.
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