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. 1989 Jul;97(3):739–744. doi: 10.1111/j.1476-5381.1989.tb12011.x

The effect of arginine and nitric oxide on resistance blood vessels of the perfused rat kidney.

R Bhardwaj 1, P K Moore 1
PMCID: PMC1854551  PMID: 2758240

Abstract

1. The vasodilator effects of arginine, nitric oxide (NO), acetylcholine (ACh) and sodium nitroprusside (NP) in the noradrenaline-preconstricted ('high tone') perfused rat kidney have been examined. 2. L-Arginine (0.6-23 mumol) caused a biphasic change in renal perfusion pressure. D-Arginine (0.6-23 mumol) was without effect. The second vasodilator component was abolished and the first vasoconstrictor effect augmented following CHAPS-induced removal of the vascular endothelium suggesting that vasodilatation was endothelium-dependent. 3. L-Arginine salts produced transient and dose-related vasodilatation. L-Arginine methylester was the most potent with an ED50 of 2.2 +/- 0.4 mumol (n = 6). The rank order of potency of the salts tested was: methylester greater than hydroxamate greater than chloride. L-Homoarginine chloride was also vasodilator (ED50, 12.0 +/- 1.3 mumol, n = 5). D-Arginine chloride was without effect at doses up to 170 mumol. Responses to L-arginine chloride were endothelium-derived relaxing factor (EDRF)-dependent being abolished by CHAPS (4.7 mg ml-1, 30 s) and significantly inhibited (greater than 70%) by gossypol (3 microM) and nordihydroguaiaretic acid (NDGA, 10 microM). 4. Vasodilatation due to NO was unaffected by CHAPS and gossypol treatment but inhibited by NDGA. NO was approximately 3 times less potent than ACh but 3000 times more potent than L-arginine methylester. 5. Kidneys perfused for 1 h with Krebs solution containing L-arginine chloride (100 microM) or L-canavanine (50 microM) showed no change in sensitivity towards ACh or NP. Higher concentrations of L-arginine chloride (500 microM) or L-canavanine (150 microM) significantly reduced the response to both vasodilators.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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