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Sympathoadrenal contribution to nicotinic and muscarinic modulation of bradykinin-induced plasma extravasation in the knee joint of the rat

FJ Miao, NL Benowitz, AI Basbaum and JD Levine

Department of Medicine, San Francisco General Hospital Medical Center, School of Medicine, University of California.

Previous results from this laboratory demonstrated that plasma extravasation produced by intra-articular infusion of bradykinin in the rat is mediated by an action on the sympathetic terminals in the knee joint and that adrenal medullary epinephrine regulates the plasma extravasation provoked by bradykinin. Because the release of epinephrine is under cholinergic control, we have now evaluated the effect of nicotinic and muscarinic cholinergic agonists on bradykinin- induced plasma extravasation in the knee joint of the rat. We report that s.c. administration of nicotine and carbachol attenuated plasma extravasation induced by bradykinin; this attenuation was significantly antagonized by systemic injection of hexamethonium and atropine, respectively. The nicotine and carbachol effects were also significantly attenuated after removal of the adrenal medulla. These results indicate that both nicotine and carbachol can inhibit bradykinin-induced plasma extravasation and that this inhibition is mediated, at least in part, through activation of nicotinic and muscarinic receptors in the adrenal medulla. Finally, local perfusion of the knee joint with hexamethonium did not affect the inhibition of bradykinin-induced plasma extravasation produced by systemic nicotine. Intra-articular perfusion of atropine potentiated the inhibition of bradykinin-induced plasma extravasation by systemic carbachol, indicating that muscarinic receptors in the synovium also contribute to plasma extravasation. The inhibitory action of nicotine on plasma extravasation may contribute, in part, to the reported increased severity of arthritis in individuals who smoke.

Volume 262, Issue 3, pp. 889-895, 09/01/1992
Copyright © 1992 by American Society for Pharmacology and Experimental Therapeutics




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Copyright © 1992 by the American Society for Pharmacology and Experimental Therapeutics.