Omeprazole, a proton pump inhibitor is known to function not only as a proton pump inhibitor but also as an anti-inflammatory agent, an antioxidant or a stimulator of gastric mucus secretion. We have shown that the pathogenesis of acute gastric mucosal lesions induced by compound 48/80, a mast cell degranulator, in rats involves neutrophil infiltration, lipid peroxidation, and mucin depletion, but not acid secretion, in the gastric mucosal tissue. Therefore, we examined whether omeprazole protects against acute gastric mucosal lesions induced by compound 48/80 in rats. Rats were injected with omeprazole (10 or 50 mg kg-1, i.p.) at 0.5 h before injection of compound 48/80 (0.75 mg kg-1, i.p.). Omeprazole prevented gastric mucosal lesion development at 0.5 and 3 h after compound 48/80 injection. Omeprazole attenuated decreased nonprotein sulfhydryl content and increased myeloperoxidase and xanthine oxidase (XO) activities and lipid peroxide (LPO) content in the gastric mucosa at 0.5 h after compound 48/80 injection and increased myeloperoxidase and XO activities and LPO content, but not decreased hexosamine and adherent mucus contents, in the gastric mucosa at 3 h. These results indicate that omeprazole protects against compound 48/80-induced acute gastric mucosal lesions in rats possibly through its anti-inflammatory and antioxidant actions.
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