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Distinction between antiulcer effect and cytoprotection.

A Robert, C Lancaster, J P Davis

    Scandinavian Journal of Gastroenterology. Supplement
    |January 1, 1984
    PubMed
    Summary
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    Antisecretory drugs protect against aspirin-induced ulcers only with low stomach acid. True cytoprotective agents like 16,16-dimethyl PGE2 prevent ulcers even with high acidity, unlike antisecretory drugs.

    Area of Science:

    • Gastroenterology
    • Pharmacology

    Background:

    • Aspirin (ASA) is a common cause of gastric ulcers.
    • The role of gastric acid and cytoprotective mechanisms in ulcer formation is complex.

    Purpose of the Study:

    • To investigate the efficacy of antisecretory agents versus cytoprotective agents in preventing aspirin-induced gastric ulcers under varying acidity conditions.
    • To compare the protective effects of cimetidine, anticholinergics, and 16,16-dimethyl PGE2 against aspirin and ethanol-induced gastric lesions.

    Main Methods:

    • Gastric ulcerations were induced in rats using oral aspirin (ASA) with varying concentrations of hydrochloric acid (HCl).
    • Ethanol-induced gastric mucosal necrosis was also studied.
    • The effects of antisecretory drugs (cimetidine, pro-banthine) and a cytoprotective agent (16,16-dimethyl PGE2) were evaluated.

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    Main Results:

    • Antisecretory agents prevented ASA-induced ulcers only at low HCl concentrations (≤0.15 M).
    • At high HCl concentrations (0.35 M), antisecretory agents were ineffective, but 16,16-dimethyl PGE2 prevented ulcers.
    • 16,16-dimethyl PGE2, but not cimetidine or anticholinergics, prevented ethanol-induced lesions.

    Conclusions:

    • Antisecretory drugs are effective against ASA-induced ulcers when exogenous acid is low.
    • High concentrations of exogenous acid can overcome the protective effects of antisecretory drugs.
    • Cytoprotective agents like 16,16-dimethyl PGE2 offer protection independent of gastric acid levels and are effective against both ASA- and ethanol-induced lesions.