Mechanisms of action of hydrogen sulfide in relaxation of mouse distal colonic smooth muscle

European Journal of Pharmacology
Ingeborg DhaeseRomain A Lefebvre

Abstract

Hydrogen sulfide (H(2)S) has been suggested as a gaseous neuromodulator in mammals. The aim of this study was to examine the influence of H(2)S on contractility in mouse distal colon. The effect of sodium hydrogen sulfide (NaHS; H(2)S donor) on prostaglandin F(2alpha) (PGF(2alpha))-contracted circular muscle strips of mouse distal colon was investigated. In addition, tension and cytosolic calcium concentration ([Ca(2+)](cyt)) in the mouse distal colon strips were measured simultaneously in the presence of NaHS. NaHS caused concentration-dependent relaxation of the pre-contracted mouse distal colon strips. The NaHS-induced relaxation was not influenced by the K(+) channels blockers glibenclamide, apamin, charybdotoxin, barium chloride and 4-aminopyridine. The relaxation by NaHS was also not influenced by the nitric oxide inhibitor L-NAME, by the soluble guanylate cyclase respectively adenylate cyclase inhibitors ODQ and SQ 22536, by the nerve blockers capsazepine, omega-conotoxin and tetrodotoxin or by several channel and receptor blockers (ouabain, nifedipine, 2-aminoethyl diphenylborinate, ryanodine and thapsigargin). The initiation of the NaHS-induced relaxation was accompanied by an increase in [Ca(2+)](cyt), but once the re...Continue Reading

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Citations

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