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. 1991 Nov;104(3):743–749. doi: 10.1111/j.1476-5381.1991.tb12498.x

Differential effects of L-arginine on the inhibition by NG-nitro-L-arginine methyl ester of basal and agonist-stimulated EDRF activity.

M D Randall 1, T M Griffith 1
PMCID: PMC1908225  PMID: 1797335

Abstract

1. An isolated, buffer-perfused rabbit ear preparation was used to investigate the influence of NG-nitro-L-arginine methyl ester (L-NAME) on endothelium-dependent vasodiltation and modulation of vasoconstrictor responses and vascular conductance. 2. Acetylcholine (0.55 pmol-1.6 nmol) caused dose-related vasodilatation of preparations constricted by the combination of 5-hydroxytryptamine and histamine (both 1 microM), with an ED50 = 31.1 +/- 7.8 pmol and a maximum dilatation of 69.9 +/- 4.3%. In the presence of 10 microM L-NAME the dose-response for vasodilator effects was shifted significantly (P less than 0.001) to the right (ED50 = 3.07 +/- 1.18 nmol) and there was a significant (P less than 0.01) depression of the maximum response (Rmax = 44.3 +/- 4.0%). The higher concentration of 100 microM L-NAME completely abolished vasodilatation to acetylcholine. L-Arginine (10 mM) did not reverse the inhibitory actions of L-NAME at either concentration. 3. L-NAME 100 microM, augmented vascular tone induced by 1 microM 5-hydroxytryptamine and 1 microM histamine, thus altering the characteristics of both pressure/flow and conductance/flow relationships such that conductance was reduced at all flow rates. The augmentation of constrictor tone was reversed in a concentration-dependent manner by L-arginine (10 microM-10 mM) and the effect of L-NAME on the conductance/flow relationships was similarly reversed by 10 mM L-arginine. The augmentation of tone was endothelium-dependent as it did not occur following functional destruction of the endothelium by perfusion of the vascular bed with the detergent CHAPS (0.3%) for 150s.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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