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Gastric mucosal histamine in duodenal-ulcer patients: release by secretin.

In 5 duodenal-ulcer patients with anaphylactic skin reaction to intradermal secretin and in 4 healthy controls, biopsy samples from the fundic region of the stomach were superfused with phosphate buffer alone and with phosphate buffer containing 20 C.U./ml synthetic secretin. In response to secretin, the mucosa from duodenal-ulcer patients released significantly increasing amounts of histamine (P is less than 0.05) whereas control tissue did not respond. Additionally, in duodenal-ulcer patients the histamine content of untreated gastric mucosa was about twice as high as in controls (P is less than 0.02). It is suggested that the elevated mucosal histamine could account for the basal and stimulated gastric hypersecretion of duodenal-ulcer patients. In addition, the results are compatible with the concept that in a certain type of duodenal ulceration, secretin does drive rather than inhibit gastric secretion.