Gastroenterology

Gastroenterology

Volume 111, Issue 4, October 1996, Pages 968-980
Gastroenterology

Kappa, but not mu or delta, opioids attenuate responses to distention of afferent fibers innervating the rat colon

https://doi.org/10.1016/S0016-5085(96)70064-1Get rights and content

Abstract

BACKGROUND & AIMS: Discomfort and pain are the principal conscious sensations that arise from the viscera, and both are increased in frequency and intensity in patients with a functional bowel disorder. Visceral receptors, perhaps sensitized, may contribute to these altered sensations. The aim of this study was to evaluate the effects of opioid receptor-selective agonists on afferent fibers innervating the colon. METHODS: Mechanosensitive pelvic nerve afferent fibers were recorded from the decentralized S1 dorsal root in anesthetized rats. The effects of opioid agonists, given intra-arterially, were studied based on the fiber's responses to noxious colorectal distention (CRD) (80 mm Hg, 30 seconds). RESULTS: A total of 115 distention-sensitive fibers innervating the colon were studied, including 32 that were studied after colonic inflammation with 2.5% acetic acid. Neither mu-(morphine and fentanyl) nor delta- ([D-Pen2, D-Pen5]enkephalin- and SNC-80) opioid receptor agonists affected responses to CRD. In contrast, kappa- (U-50,488 and fedotozine) opioid receptor agonists dose-dependently attenuated responses to CRD. Acetic acid sensitized about half of the fibers studied, but neither the potency nor the efficacy of U-50, 488 or FDZ were changed after colonic inflammation. CONCLUSIONS: These results suggest a role for peripheral kappa-opioid receptors in the modulation of visceral nociception. (Gastroenterology 1996 Oct;111(4):968-80)

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