Involvement of α2-Adrenoceptors in the Gastric Protective Effect of Nitroglycerin Against Acidified Ethanol-Induced Mucosal Injury View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2007-11

AUTHORS

Felix W. Leung, Chi Chung Chan

ABSTRACT

Clinical observations reveal that alcohol intake is associated with an increase in upper gastrointestinal hemorrhage requiring hospitalization and that nitroglycerin or long-acting nitrates lower this risk. Nitroglycerin, a gastric vasodilator that can increase gastric fluid volume, protects the rodent stomach against damage, including that caused by 70% ethanol. Blockade of alpha(2)-adrenoceoptors attenuates gastric protection by intragastric nicotine against 40% ethanol. We tested the hypothesis that the protective effect of nitroglycerin is mediated by an increase in gastric fluid volume and alpha(2)-adrenoceoptors. Nitroglycerin, 5 mg/kg, vehicle, or acidified ethanol was administered intragastrically. In study 1 acidified ethanol-induced mucosal injury was measured. In study 2 the effect of increasing gastric volume (1 ml/kg) on mucosal injury was assessed. In study 3 the effect of yohimbine (alpha(2)-adrenoceoptor antagonist), 5 mg/kg subcutaneously, on the nitroglycerein-mediated protective effect was determined. Results showed that nitroglycerin significantly attenuated the number and length of mucosal lesions induced by acidified ethanol. Increase in gastric fluid volume by exogenously administered saline did not alter the protective effect. Yohimbine blocked the nitroglycerin-mediated protection. These experimental data are consistent with the observation that nitrates lower the risk of ethanol-induced gastrointestinal complications. alpha(2)-Adrenoceoptors are responsible in part for the protective effect of nitroglycerin. More... »

PAGES

3070-3074

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10620-006-9692-1

DOI

http://dx.doi.org/10.1007/s10620-006-9692-1

DIMENSIONS

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17394070


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55 schema:description Clinical observations reveal that alcohol intake is associated with an increase in upper gastrointestinal hemorrhage requiring hospitalization and that nitroglycerin or long-acting nitrates lower this risk. Nitroglycerin, a gastric vasodilator that can increase gastric fluid volume, protects the rodent stomach against damage, including that caused by 70% ethanol. Blockade of alpha(2)-adrenoceoptors attenuates gastric protection by intragastric nicotine against 40% ethanol. We tested the hypothesis that the protective effect of nitroglycerin is mediated by an increase in gastric fluid volume and alpha(2)-adrenoceoptors. Nitroglycerin, 5 mg/kg, vehicle, or acidified ethanol was administered intragastrically. In study 1 acidified ethanol-induced mucosal injury was measured. In study 2 the effect of increasing gastric volume (1 ml/kg) on mucosal injury was assessed. In study 3 the effect of yohimbine (alpha(2)-adrenoceoptor antagonist), 5 mg/kg subcutaneously, on the nitroglycerein-mediated protective effect was determined. Results showed that nitroglycerin significantly attenuated the number and length of mucosal lesions induced by acidified ethanol. Increase in gastric fluid volume by exogenously administered saline did not alter the protective effect. Yohimbine blocked the nitroglycerin-mediated protection. These experimental data are consistent with the observation that nitrates lower the risk of ethanol-induced gastrointestinal complications. alpha(2)-Adrenoceoptors are responsible in part for the protective effect of nitroglycerin.
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