Effects of sucralfate on gastroduodenal bicarbonate secretion and prostaglandin E2 metabolism.

The mechanism of action of sucralfate has been investigated. Using homogenized rabbit mucosa, the drug increased arachidonic acid conversion to prostaglandin E2 without affecting catabolism. Luminal administration of sucralfate (0.5 g/liter) caused marked stimulation of bicarbonate secretion by isolated amphibian gastric mucosa but not duodenal mucosa. In a higher dose (1 g/liter), duodenal bicarbonate secretion was also stimulated. These effects are likely to be due to endogenous prostaglandin formation since they are inhibited by indomethacin. The results suggest that the cytoprotective action of sucralfate is due to stimulation of endogenous prostaglandin formation and may involve various mucosal defensive factors.