| Literature DB >> 2421587 |
S J Pandol, K Dharmsathaphorn, M S Schoeffield, W Vale, J Rivier.
Abstract
From structure-activity relationship studies of rat growth hormone-releasing factor (rGFR) on the vasoactive intestinal peptide (VIP) receptor in an in vitro preparation of exocrine pancreas, we predicted that [4Cl-D-Phe6, Leu17]VIP would be a competitive antagonist for the action of VIP. Micromolar concentrations of synthetic [4Cl-D-Phe6, Leu17]VIP competitively antagonized VIP-stimulated amylase release in the pancreatic preparation and VIP-stimulated short-circuit current changes in a colonic tumor cell line. In addition, [4Cl-D-Phe6, Leu17]VIP inhibited amylase release stimulated by rGRF, high concentrations of secretin (agents that act through the VIP receptor), and peptide contaminants in a preparation of natural glucagon. Finally, [4Cl-D-Phe6, Leu17]VIP did not inhibit the action of agonists for the secretin, GRF, or glucagon receptors.Entities:
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Year: 1986 PMID: 2421587 DOI: 10.1152/ajpgi.1986.250.4.G553
Source DB: PubMed Journal: Am J Physiol ISSN: 0002-9513