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- W2056326084 abstract "Since dietary salt loading enhances nitric oxide (NO) generation in the kidney, we investigated the hypothesis that changes in salt intake have specific effects on vascular resistance in the kidney mediated by the L-arginine-NO pathway. We contrasted changes in renal and hindquarter vascular resistances (RVR and HQVR) in anesthetized rats during intravenous infusions of graded doses of the NO synthase inhibitor NG-nitro-L-arginine methyl ester (L-NAME). Groups (N = 8 to 10) of rats were maintained on a high salt (HS) or low salt (LS) diet for two weeks. Compared to those on LS, rats on HS had a greater increase in mean arterial pressure (delta MAP; +32 +/- 4 vs. +22 +/- 3%; P = 0.05) and RVR (+160 +/- 17 vs. +83 +/- 10%; P < 0.005) and a greater fall in renal blood flow (delta RBF; -47 +/- 3 vs. -32 +/- 4%; P < 0.01); changes in HQVR were similar in the two groups. The enhanced RVR response to L-NAME in HS rats could not be ascribed to the higher renal perfusion pressure (RPP) since it persisted in rats whose RPP was controlled by adjustment of a suprarenal aortic clamp. Changes in RVR with an NO donor (SIN-1) were similar in HS and LS rats. L-NAME reduced plasma renin activity in both HS and LS rats. After inhibition of ACE with captopril, or of angiotensin II type I (AT1) receptor with losartan, the increase in RVR with L-NAME remained greater in HS than LS rats.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2056326084 date "1994-09-01" @default.
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- W2056326084 title "Renal vasoconstriction during inhibition of NO synthase: Effects of dietary salt" @default.
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- W2056326084 doi "https://doi.org/10.1038/ki.1994.316" @default.
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