The effect of long-term treatment with antisecretory and antiulcer drugs on gastric secretory and motor responsiveness to caerulein in rats with chronic ulcers.

In the present paper the gastric secretory and motor responsiveness to a gastrin-like peptide, caerulein, was assessed in rats with a chronic gastric ulcer induced by 'isolation', 48 h after completing prolonged treatments (30 and 60 days) with cimetidine (80 and 160 mg/kg), pirenzepine (8 and 16 mg/kg) and sulglycotide (160 mg/kg) administered orally as a single daily dose. After a 30 day pretreatment with both doses of cimetidine, gastric acid secretion was inhibited and the pylorus spasmogenic activity induced by caerulein was enhanced. The gastric effects of the peptide were not modified by pirenzepine pretreatment while an antisecretory action was shown by sulglycotide after the completion of prolonged treatment (60 days). The ulcers were significantly reduced by cimetidine (low dose) and sulglycotide after 30 day pretreatment. The effects are more likely to be related to the treatment than to the presence of the drugs on gastric receptors.