Abstract
In contrast to the skin and some visceral organs the capability of capsaicin-sensitive sensory nerves of evoking an inflammatory response in the gastrointestinal tract is equivocal. We have therefore investigated the neurogenic plasma extravasation induced by local application of capsaicin to the stomach, duodenum, jejunum, ileum and colon of the rat. Permeable vessels were visualised histologically with the vascular labelling technique using colloidal silver. In the smooth muscle layer of the small intestine, capsaicin elicited a 3-fold increase in the density of labelled blood vessels (diameter, 7-35 microns). Significant capsaicin-evoked plasma extravasation was also observed in the submucosa of the jejunum and ileum, and in the basal layer of the jejunal mucosa. Capsaicin-induced extravasation was not noted in the stomach and the colon. The data suggest the involvement of capsaicin-sensitive afferents in inflammatory processes in the rat small intestine.
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