Gastrin derivatives investigated for secretory potency and for changes in gastric mucosal histamine formation

Abstract
1 . Acid secretion and rate of histamine formation in the gastric mucosa were determined in rats after injection of hog gastrin II, gastrin pentapeptide and some substituted analogues of the C-terminal tetrapeptide of gastrin. 2 . Accelerated mucosal histamine formation was induced by hog gastrin II, gastrin pentapeptide and those analogues which elicited acid secretion, whereas secretorily inactive derivatives did not alter histamine formation.