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Protection against gastric ischemia-reperfusion injury by nitric oxide generators.

Abstract：

:Nitric oxide appears to play an important role in maintaining gastric mucosal integrity. This study aimed to investigate whether a nitric oxide donor (sodium nitroprusside) or stimulation of endogenous nitric oxide synthesis (with acetylcholine) protects against gastric ischemia-reperfusion injury. Rats were subjected to 30 min of ischemia followed by 15 min of reperfusion. Injury was assessed by quantitative histology. Intravenous sodium nitroprusside (50-75 micrograms/kg) or acetylcholine (10-25 micrograms/kg), immediately before reperfusion, significantly reduced the percentage of mucosal injury compared with controls. Inhibition of nitric oxide synthesis by topical application of 12.5 mg/kg NG-methyl-L-arginine before acetylcholine treatment, abolished the effects of acetylcholine. The protective effects of acetylcholine and sodium nitroprusside did not appear to be related to local vasodilation since neither drug improved gastric blood flow and infusion of a non-nitric oxide vasodilator (papaverine, 1 mg/kg), had no protective effect on reperfusion injury. Sodium nitroprusside (50 micrograms/kg) and acetylcholine (25 micrograms/kg) significantly reduced polymorphonuclear leukocyte infiltration and extravasation into the mucosa compared with controls. NG-Methyl-L-arginine pretreatment before acetylcholine abolished these effects. We conclude that nitric oxide generators significantly reduce mucosal injury following ischemia-reperfusion and that this may occur via a reduction in polymorphonuclear leukocyte infiltration into the mucosa.

journal_name

Dig Dis Sci

journal_title

Digestive diseases and sciences

authors

Andrews FJ,Malcontenti-Wilson C,O'Brien PE

doi

10.1007/BF02090210

subject

Has Abstract

pub_date

1994-02-01 00:00:00

pages

366-73

issue

2

eissn

0163-2116

issn

1573-2568

journal_volume

39

pub_type

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