Renal hemodynamic effects of dietary protein in the rat: role of nitric oxide.
The biologic mediator(s) of the renal hemodynamic effects of a high dietary protein intake (hyperfiltration and renal vasodilation) are unknown. The endogenous nitrovasodilator nitric oxide (NO) derives from the amino acid L-arginine, and NO has been demonstrated to mediate the hyperfiltration and vasodilation observed during amino acid infusion in rats. We therefore hypothesized that NO may also mediate the long-term renal hemodynamic effects of variations in dietary protein intake. We studied rats maintained with low protein (6%) and high-protein (50%) diets for 2 weeks. An additional group of rats receiving a high-protein diet was also treated with the NO synthase inhibitor, L-nitro-arginine-methyl ester (NAME, 100 mg per liter of drinking water). After 2 weeks a high-protein diet was associated with a significant increase in glomerular filtration rate (GFR) (50% protein group vs 6% protein group, 1.01 +/- 0.03 vs 0.61 +/- 0.03 ml/min; p < 0.05) and renal vasodilation (renal vascular resistance: 50% protein group vs 6% protein group, 11.70 +/- 0.88 vs 17.65 +/- 1.55 mm Hg/min/ml; p < 0.05) compared with a low-protein diet.(ABSTRACT TRUNCATED AT 250 WORDS)
Tolins
J P
JP
Renal Transplant Service, Minneapolis Veterans Affairs Medical Center, MN 55417.
Shultz
P J
PJ
Westberg
G
G
Raij
L
L
D000594:Amino Acid Oxidoreductases / Q000037:antagonists & inhibitors; D000818:Animals; D001120:Arginine / Q000031:analogs & derivatives / Q000494:pharmacology; D006152:Cyclic GMP / Q000652:urine; D004044:Dietary Proteins / Q000008:administration & dosage / Q000494:pharmacology*; D005919:Glomerular Filtration Rate; D006439:Hemodynamics; D007668:Kidney / Q000098:blood supply*; D008297:Male; D019331:NG-Nitroarginine Methyl Ester; D009566:Nitrates / Q000652:urine; D009569:Nitric Oxide / Q000502:physiology*; D019001:Nitric Oxide Synthase; D009573:Nitrites / Q000652:urine; D051381:Rats; D017207:Rats, Sprague-Dawley; D014655:Vascular Resistance / Q000187:drug effects; D014664:Vasodilation / Q000187:drug effects
D004044:Dietary Proteins; D009566:Nitrates; D009573:Nitrites; D009569:Nitric Oxide; D001120:Arginine; D019001:Nitric Oxide Synthase; D000594:Amino Acid Oxidoreductases; D006152:Cyclic GMP; D019331:NG-Nitroarginine Methyl Ester