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Background: Gastric ulcer is a discontinuity in the gastric mucosa that occurs due to imbalance between gastric mucosal protective factors and aggressive factors. The Aim of the present work was to test and compare the protective effects of an antisecretory H 2 receptor blocker; ranitidine and other recently suggested gastroprotective drugs: L-arginine; a precursor of NO, zinc sulfate; an anti-inflammatory antioxidant agent and pioglitazone; a PPAR-g agonist, on a rat model of aspirin induced gastric ulcer. Methods: Acute gastric lesion was induced in rats by a single oral dose of aspirin 300mg/ kg body weight. L-arginine 200mg / kg b. wt, zinc sulfate 80 mg/ kg b. wt, and pioglitazone 10 mg / kg b. wt. were given alone and in combination with ranitidine 50 mg / kg b. wt for 3 days before induction of gastric lesion. Results: Aspirin induced a significant increase in gastric mucosal lesion score and free and total gastric hydrochloric acid with a significant decrease in gastric nitric oxide and mucin levels as compared to normal group. A significant increase in gastric malondialdhyde and decrease in reduced glutathione as compared to normal group. L-arginine, zinc sulfate, and pioglitazone produced improvement of most of the measured parameters as compared to non-treated group. Combination of L-arginine and ranitidine was superior in prophylaxis against aspirin-induced gastric ulcer when compared to the effects of each drug used individually, and the other studied combinations. Conclusion: The role of HCl and NO seems more important in the pathogenesis of aspirin induced gastric ulcer, as evidenced by the better protective effects of combination of ranitidine and L-arginine in comparison to the ranitidine with either zinc sulfate or pioglitazone.

Effect of Sex Hormones on Progression of Diabetic Renal Disease in Experimental Model of Streptozotocin Induced Diabetic Rats