Abstract
Previous studies showed that nicotine induces adrenergic nerve-dependent vasodilation that is mediated by endogenous calcitonin gene-related peptide (CGRP) released from CGRP-containing (CGRPergic) nerves. The mechanisms underlying the nicotine-induced vasodilation were further studied. Rat mesenteric vascular beds without endothelium were contracted by perfusion with Krebs solution containing methoxamine, and the perfusion pressure was measured with a pressure transducer. Perfusion of nicotine (1-100 microm) for 1 min caused concentration-dependent vasodilation. Capsazepine (vanilloid receptor-1 antagonist; 1-10 microm) and ruthenium red (inhibitor of vanilloid response; 1-30 microm) concentration-dependently inhibited the nicotine-induced vasodilation without affecting the vasodilator response to exogenous CGRP. Nicotine-induced vasodilation was not inhibited by treatment with 3,4-dihydroxyphenylalanine (DOPA) receptor antagonist (l-DOPA cyclohexyl ester; 0.001-10 microm), dopamine D1 receptor-selective antagonist (SCH23390; 1-10 microm), dopamine D2 receptor antagonist (haloperidol; 0.1-0.5 microm), ATP P2x receptor-desensitizing agonist (alpha,beta-methylene ATP; 1-10 microm), adenosine A2 receptor antagonist (8(p-sulfophen...Continue Reading
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