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- W2113887941 abstract "Calcitonin gene-related peptide (CGRP) exists in nerves throughout the gastrointestinal tract and pancreas, and exogenous CGRP has been reported to inhibit many endocrine and exocrine secretions of the gut and pancreas. Because somatostatin also has widespread inhibitory actions and because both gut and pancreatic somatostatin secretion may be under peptidergic control, we examined the influence of CGRP on circulating levels of somatostatin-like immunoreactivity (SLI) and on hormone output from the duodenal lobe of the dog pancreas in situ. Intravenous infusion of human CGRP in anesthetized dogs increased arterial SLI in a dose-dependent manner. During iv infusion of CGRP at 500 pmol/min, the increment of circulating SLI (change at 20 min, +175 +/- 24 fmol/ml) was composed of nearly equimolar amounts of SLI-14 and SLI-28, suggesting an effect of CGRP on both gastric and intestinal somatostatin secretion. The effect of iv CGRP (500 pmol/min) on arterial SLI exceeded those of iv CCK-8 (440 pmol/min), iv isoproterenol (10 nmol/min), and intragastric administration of acidified liver extract. In contrast, salmon calcitonin (500 pmol/min, iv) was without effect. CGRP did not stimulate pancreatic SLI output when infused iv (500 pmol/min) or when infused directly into a pancreatic artery (5 pmol/min). The pancreatic infusion of CGRP decreased insulin output slightly (change at 20 min, -21 +/- 8%), but did not affect glucagon output. We conclude that CGRP is a most effective yet selective stimulator of gastrointestinal somatostatin release, with little influence on islet function. We suggest that exogenous and possibly endogenous neuronal CGRP could exert inhibitory effects on gastrointestinal function via the release of somatostatin." @default.
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- W2113887941 date "1987-05-01" @default.
- W2113887941 modified "2023-10-15" @default.
- W2113887941 title "Calcitonin Gene-Related Peptide: A Potent and Selective Stimulator of Gastrointestinal Somatostatin Secretion*" @default.
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- W2113887941 doi "https://doi.org/10.1210/endo-120-5-1774" @default.
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