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pubmed-article:9539639pubmed:abstractTextCholecystokinin prevents gastric injury by an unknown mechanism. This study was conducted in conscious, fasted female rats in order to assess the role of endogenous prostaglandins as a potential protective mechanism for cholecystokinin-induced gastroprotection. Intravenous administration of cholecystokinin (0.05-5 nmol/kg) dose-dependently reduced macroscopic injury to the glandular portion of the stomach caused by 1 ml of orally administered acidified ethanol (150 mM hydrochloric acid-50% ethanol), an effect corroborated by histologic analysis. In time course studies, this protective action occurred as early as 10 min following cholecystokinin injection (5 nmol/kg intravenously), but was absent at 1 hr. Cyclooxygenase inhibition with either indomethacin (5 mg/kg intraperitoneally) or aspirin (100 mg/kg intraperitoneally) resulted in a partial reversal in cholecystokinin-induced gastroprotection, effects that were similar in magnitude. However, while indomethacin reduced gastric mucosal prostaglandin synthesis (enzyme-linked immunoassay) by 60%, aspirin almost totally abolished prostaglandin synthesis (95% reduction). Cholecystokinin (5 nmol/kg intravenously) did not significantly enhance gastric mucosal prostaglandin synthesis in the absence of cyclooxygenase inhibition. These data indicate that cholecystokinin requires the presence of endogenous prostaglandins in order to fully exert its gastroprotective actions. However, release of endogenous prostaglandins does not entirely explain the protective response, and additional factors likely participate in this action.lld:pubmed
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pubmed-article:9539639pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:9539639pubmed:year1998lld:pubmed
pubmed-article:9539639pubmed:articleTitleCyclooxygenase inhibition attenuates cholecystokinin-induced gastroprotection.lld:pubmed
pubmed-article:9539639pubmed:affiliationDepartment of Surgery, The University of Texas-Houston Medical School, 77030, USA.lld:pubmed
pubmed-article:9539639pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9539639pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed