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Sustained resveratrol infusion increases natriuresis independent of renal vasodilation
Author(s) -
Gordish Kevin L.,
Beierwaltes William H.
Publication year - 2014
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.12144
Subject(s) - resveratrol , excretion , natriuresis , renal function , endocrinology , chemistry , renal blood flow , medicine , vasodilation , kidney , nitric oxide , biochemistry
Resveratrol is reported to exert cardio‐renal protective effects in animal models of pathology, yet the mechanisms underlying these effects are poorly understood. Previously, we reported an i.v . bolus of resveratrol induces renal vasodilation by increasing nitric oxide bioavailability and inhibiting reactive oxygen species. Thus, we hypothesized a sustained infusion of resveratrol would also increase renal blood flow ( RBF ), and additionally glomerular filtration rate ( GFR ). We infused vehicle for 30 min followed by 30 min resveratrol at either: 0, 0.5, 1.0, 1.5 mg/min, and measured RBF , renal vascular resistance ( RVR ), GFR , and urinary sodium excretion. At all three doses, blood pressure and GFR remained unchanged. Control RBF was 7.69 ± 0.84 mL/min/gkw and remained unchanged by 0.5 mg/min resveratrol (7.88 ± 0.94 mL/min/gkw, n  = 9), but urinary sodium excretion increased from 2.19 ± 1.1 to 5.07 ± 0.92 μ mol/min/gkw ( n  = 7, P  < 0.01). In separate experiments, 1.0 mg/min resveratrol increased RBF by 17%, from 7.16 ± 0.29 to 8.35 ± 0.42 mL/min/gkw ( P  < 0.01, n  = 10), decreased RVR 16% from 13.63 ± 0.65 to 11.36 ± 0.75 ARU ( P  < 0.003) and increased sodium excretion from 1.57 ± 0.46 to 3.10 ± 0.80  μ mol/min/gkw ( n  = 7, P  < 0.04). At the 1.5 mg/min dose, resveratrol increased RBF 12% from 6.76 ± 0.57 to 7.58 ± 0.60 mL/min/gkw ( n  = 8, P  < 0.003), decreased RVR 15% (15.58 ± 1.35 to 13.27 ± 1.14 ARU , P  < 0.003) and increased sodium excretion (3.99 ± 1.71 to 7.80 ± 1.51  μ mol/min/gkw, n  = 8, P  < 0.04). We conclude that a constant infusion of resveratrol can induce significant renal vasodilation while not altering GFR or blood pressure. Also, resveratrol infusion produced significant natriuresis at all doses, suggesting it may have a direct effect on renal tubular sodium handling independent of renal perfusion pressure or flow.

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