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. 1988 Nov;95(3):835–843. doi: 10.1111/j.1476-5381.1988.tb11712.x

Endothelium-derived relaxing factor and the effects of acetylcholine and histamine on resistance blood vessels.

R Bhardwaj 1, P K Moore 1
PMCID: PMC1854209  PMID: 3264734

Abstract

1. The role of endothelium-derived relaxing factor (EDRF) in the action of vasodilator (acetylcholine, histamine, nitroprusside) and vasoconstrictor (noradrenaline, vasopressin) drugs on vascular resistance in the isolated perfused kidney and mesentery of the rat was studied. 2. Acetylcholine (EC50 = 0.18 +/- 0.05 nmol and 3.1 +/- 0.06 nmol, n = 8) and histamine (EC50 = 31.2 +/- 4.9 nmol and 46.2 +/- 3.9 nmol, n = 8) produced dose-related vasodilatation in noradrenaline-preconstricted (i.e. 'high tone') rat renal and mesenteric blood vessels. The response to both vasodilators (but not nitroprusside) was abolished by infusion of CHAPS (4.7 mg ml-1, 30 s). By use of an immunocytochemical staining procedure CHAPS was demonstrated to remove vascular endothelial cells lining intrarenal blood vessels. 3. Gossypol (3 microM), metyrapone (10 microM) and nordihydroguaiaretic acid, (NDGA, 30 microM), presumed inhibitors of EDRF biosynthesis, reduced or abolished the response to acetylcholine and histamine in perfused kidney and mesentery of the rat without affecting vasodilatation due to nitroprusside. Mepacrine (10 microM) similarly abolished the response to acetylcholine and histamine but in addition, reduced the response to nitroprusside in both preparations. 4. Methylene blue (100 microM), a presumed antagonist of the effect of EDRF, abolished vasodilatation due to acetylcholine and histamine and reduced the response to nitroprusside in perfused rat kidney and mesentery. Superoxide dismutase, SOD (15 u ml-1), was without effect.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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