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  • Title: Role of cholecystokinin in mediating GRP-stimulated gastric, biliary and pancreatic functions in man.
    Author: Hildebrand P, Drewe J, Luo H, Ketterer S, Gyr K, Beglinger C.
    Journal: Regul Pept; 1992 Sep 22; 41(2):119-29. PubMed ID: 1438984.
    Abstract:
    To explore the mechanisms of gastrin-releasing peptide (GRP)-induced gut functions in man, we investigated the effect on gallbladder contraction, exocrine pancreatic secretion and gastric acid secretion of a recently developed CCK receptor antagonist, loxiglumide, on GRP-stimulated effects in six healthy human subjects. Intravenous infusion of graded doses of synthetic human GRP (1-27 pmol/kg per h) caused significant and dose-dependent increases in pancreatic enzyme and gastric acid secretions and in gallbladder contraction. Intravenous administration of loxiglumide (10 mg/kg per h) abolished GRP-stimulated gallbladder contraction, augmented gastric acid secretion, but did not affect exocrine pancreatic secretion. The results suggest that endogenously released CCK is (1) responsible for GRP-stimulated gallbladder contraction, and (2) involved in regulating gastric acid secretion. The results further suggest that GRP-stimulated pancreatic secretion is not mediated by CCK, but has a direct response of GRP on the exocrine pancreas.
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