Abstract:
:Pancreatic duct bicarbonate secretion is mediated primarily by secretin-induced elevation of intracellular cyclic AMP, although little is known of the effects of other physiological regulators on pancreatic duct cyclic AMP metabolism. We investigated the effects of secretin and several other potential agonists on cyclic AMP levels in isolated guinea pig main and interlobular pancreatic duct segments and in cultured duct epithelial monolayers. Secretin (0.1 microM) caused a five- to eightfold elevation of cyclic AMP in both isolated ducts and cultured monolayers (EC50 = 0.15 nM). Main duct segments, while responsive, were less so than segments of interlobular duct. In isolated duct segments, carbachol, bombesin, cholecystokinin, substance P, calcitonin gene-related peptide, glucagon, insulin, isoproterenol, neurotensin, and prostaglandin E2 did not significantly alter resting or secretin-stimulated cyclic AMP levels. In contrast, 0.1 microM vasoactive intestinal peptide significantly increased cyclic AMP to a level comparable to that evoked by an equal concentration of secretin. Somatostatin significantly attenuated the effects of a submaximal (physiological) dose of secretin on duct cyclic AMP levels without altering resting cyclic AMP levels, suggesting that somatostatin's effects on pancreatic duct fluid secretion are mediated by inhibition of adenylyl cyclase activity.
journal_name
Pancreasjournal_title
Pancreasauthors
de Ondarza J,Hootman SRdoi
10.1097/00006676-199510000-00008subject
Has Abstractpub_date
1995-10-01 00:00:00pages
261-70issue
3eissn
0885-3177issn
1536-4828journal_volume
11pub_type
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