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Effects of a new antiulcer drug, MCI-727, on gastric and duodenal lesions, gastric secretion and gastric motility were studied in comparison with cimetidine and teprenone. MCI-727 dose-dependently (3-100 mg/kg, p.o. or i.d.) inhibited the development of acute gastric or duodenal lesions such as pyrolus ligation-, water-immersion stress-, indomethacin-, HCl-, HCl-ethanol-induced gastric lesions and cysteamine-induced duodenal lesions in rats and histamine-induced duodenal lesions in guinea pigs. These antiulcer effects exceeded those of cimetidine or teprenone. Repeated administration of MCI-727 (0.3-3 mg/kg/day, p.o., for 10 days) significantly promoted the spontaneous healing of acetic acid-induced chronic gastric ulcers. Concerning gastric acid secretion, MCI-727 selectively inhibited tetragastrin-stimulated acid secretion without effecting basal acid secretion and acid secretion by other stimuli. Cimetidine and teprenone inhibited acid secretion in several cases. MCI-727 and teprenone had inhibitory effects on gastric motility, although cimetidine had no effect. These results suggest that MCI-727 has a wide spectrum of antiulcer activity, and its mode of antiulcer action is different from that of cimetidine or teprenone.

Effects of MCI-727, a New Antiulcer Agent, on Various Gastric and Duodenal Lesions in Experimental Animals.