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“It can suppress the secretion of serotonin , as well as the gastroenteropancreatic peptides gastrin, vasoactive intestinal peptide (VIP), insulin, glucagon, secretin , motilin, and pancreatic polypeptide.”
“These findings suggest that secretin promotes the metabolism of serotonin and dopamine in the central nervous system, which may contribute to improvement in clinical symptoms of autism.”
No to hattatsu = Brain and development • 2004 | View Paper
“Under the stimulation with secretin, 5-HT decreased the intracellular pH (pH(i)) and reduced the rate of pH(i) recovery after acid loading with NH(4)(+), suggesting that 5-HT inhibits the intracellular accumulation of HCO3(-).”
The Journal of clinical investigation • 2001 | View Paper
“In a separate study, intraduodenal, but not intraileal, 5-HT application induced a dose-dependent increase in pancreatic protein secretion , which was not blocked by the CCK-A antagonist CR-1409.”
American journal of physiology. Gastrointestinal and liver physiology • 2001 | View Paper
“ 5-HT inhibits spontaneous fluid secretion as well as stimulated secretion with secretin (cAMP mediated) or ACh (Ca2+ mediated) in the isolated guinea pig pancreatic ducts.”