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In order to elucidate the action of an H2 blocker (cimetidine) and gastric mucosal protection agents (sucralfate and sofalcone) on the relapse and recurrence of gastric ulcer, the effects of cimetidine, sucralfate and sofalcone on the contents of histamine and serotonin and histidine decarboxylase (HDC) activity in the gastric mucosa were examined in the ulcer region and the intact region at the 10th day after the operation to produce acetic acid-induced gastric ulcer in rats. The following results were obtained: 1) HDC activity in the gastric mucosa of rats treated with cimetidine (100 mg/kg twice daily) tended to increase in the intact region, and it was significantly increased in the ulcer region. 2) Increased HDC activity due to cimetidine treatment was observed at the 10th day after interruption of cimetidine administration. 3) The HDC activity in the gastric mucosa was not changed by the treatment with sucralfate (500 mg/kg/day) and sofalcone (200 mg/kg/day). The results suggest that the increased HDC activity in the gastric mucosa might participate in the relapse and recurrence of gastric ulcer after discontinuation of cimetidine administration.

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Effects of the anti-ulcer agents on the amine contents and regulating enzyme activity of gastric mucosa during the healing process of acetic acid induced gastric ulcer in rats.