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- ArticleWazna MF, Stein T, Wise L.Ann Surg. 1977 Aug;186(2):130-5.The purpose of these studies was to evaluate the possible role of serotonin on pepsin secretion. The results of our data suggest that serotonin is a stimulator of pepsin secretion since (a) pretreatment with reserpine (which depletes serotonin stores) abolished the stimulatory effect of histamine on pepsin secretion; (b) pretreatment with UML-491 (a serotonin blocking agent at the effector level) augmented the pepsin inhibition induced by the intraduodenal infusion of fat, and (c) 5-hydroxytryptophan (a serotonin precursor) caused a significant stimulation of pepsin secretion. The mode of action of serotonin is probably by a direct hormonal action on the gastric chief cells.