PMID: 7524993Aug 1, 1994Paper

Cutaneous vasodilatation induced by nitric oxide-evoked stimulation of afferent nerves in the rat

British Journal of Pharmacology
P Holzer, M Jocic


1. The site of action at which nitric oxide (NO) may contribute to neurogenic vasodilatation in the hindpaw skin of urethane-anaesthetized rats was examined by the use of NG-nitro-L-arginine methyl ester (L-NAME), an inhibitor of NO synthase. 2. Skin blood flow was measured by laser Doppler flowmetry, and neurogenic vasodilatation was evoked either by topical application of mustard oil (5%) or antidromic electrical stimulation of the saphenous nerve (antidromic vasodilatation). 3. L-NAME (60 mumol kg-1, i.v.) attenuated the hyperaemia evoked by mustard oil in an enantiomer-specific manner but failed to reduce antidromic vasodilatation and the vasodilatation due to i.v. injected calcitonin gene-related peptide (CGRP) and substance P (0.1-1 nmol kg-1 each), two proposed mediators of neurogenic vasodilatation. 4. Pretreatment of rats with capsaicin (125 mg kg-1, s.c. 2 weeks beforehand), to defunctionalize afferent neurones, reduced the hyperaemic response to mustard oil and prevented L-NAME from further decreasing the vasodilatation evoked by mustard oil. 5. Intraplantar infusion of sodium nitroprusside (SNP, 0.15 nmol in 1 min), a donor of NO, induced hyperaemia which was significantly diminished by the CGRP antagonist CGRP8-37 ...Continue Reading


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