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Nitric oxide enhances prostaglandin production in ethanol-induced gastric mucosal injury in rats.

Abstract：

:The interaction between endogenous nitric oxide (NO), elicited by administration of Escherichia coli lipopolysaccharide, and cyclooxygenase system, in ethanol-induced injury in rat gastric mucosa, was investigated. Administration of graded doses of lipopolysaccharide reduced the gastric mucosal injury in response to ethanol. The ex vivo production of both nitrite and prostaglandin E2 was increased in dose-related manner by lipopolysaccharide. Pretreatment with dexamethasone, L-N6-(1-Iminoethyl)lysine(dihydrochloride) and L-NG-nitro arginine methyl ester inhibited the protection associated with lipopolysaccharide treatment and the ex vivo production of both, nitrite and prostaglandin E2. The pretreatment with L-arginine counteracted the decrease of nitrite and prostaglandin E2 production in lipopolysaccharide-treated rats in which nitric oxide synthesis was blocked by L-N6-(1-Iminoethyl)lysine(dihydrochloride). Administration of sodium nitroprusside and S-nitroso-N-acetyl-D,L-penicillamine caused a dose related enhancement in the accumulation of prostaglandin E2. Indomethacin administration and N-(2-Cyclohexyloxy-4-nitrophenyl)methanesulfonamide were ineffective in suppressing lipopolysaccharide-mediated protection against ethanol-induced damage, and in suppressing ex vivo increase of nitrite whereas the ex vivo increase of prostaglandin E2 was prevented in a dose-related fashion. These results indicate that in ethanol-induced rat gastric injury, endogenous NO elicited by lipopolysaccharide or released by NO donors is able to activate the cyclooxygenase pathway, and the protective effect of lipopolysaccharide is dependent upon NO formation.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Franco L,Doria D

doi

10.1016/s0014-2999(98)00161-7

subject

Has Abstract

pub_date

1998-05-08 00:00:00

pages

247-56

issue

2-3

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(98)00161-7

journal_volume

348

pub_type

杂志文章

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