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Decreased aortic smooth muscle contraction in a rat model of multibacterial sepsis
Author(s) -
Wang Changhua,
Mansard Arnaud,
Giummelly Philippe,
Atkinson Jeffrey
Publication year - 2004
Publication title -
fundamental and clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 73
eISSN - 1472-8206
pISSN - 0767-3981
DOI - 10.1111/j.1472-8206.2004.00293.x
Subject(s) - contraction (grammar) , contractility , nitric oxide synthase , nitric oxide , vasodilation , soluble guanylyl cyclase , chemistry , urotensin ii , medicine , endocrinology , vascular smooth muscle , vasoconstriction , smooth muscle , pharmacology , guanylate cyclase , receptor
We investigated whether blockade of the smooth muscle cell (SMC) inducible nitric oxide synthase (iNOS)–soluble guanylyl cyclase (sGC) vasodilator pathway would restore the fall in vasoreactivity produced by sepsis following cecal ligation and perforation (CLP) in rats. Contraction of adjacent aortic rings paired for the presence or absence of endothelial cells (EC) was recorded following high [K + ] e (40 m m ) or norepinephrine (NE, 10 −8 to 10 −5 m ) in the presence of the nitric oxide synthase inhibitor (NOS), N G ‐nitro‐ l ‐arginine methyl ester ( l ‐NAME, 0.3 m m ) or the sGC inhibitor, 1H‐[1,2,4]oxadiazolo[4,3‐alpha]quinoxalin‐1‐one (ODQ, 5 μ m ). In EC‐denuded rings, sepsis halved SMC contraction induced by high [K + ] e or NE; neither l ‐NAME nor ODQ produced an increase in NE E max or high [K + ] e ‐evoked contraction. In conclusion, SMC contractility is globally reduced in CLP; this reduction does not appear to be explained by induction of SMC NOS in this CLP model.