Effects of the novel (Pro(3))GIP antagonist and exendin(9-39)amide on GIP- and GLP-1-induced cyclic AMP generation, insulin secretion and postprandial insulin release in obese diabetic (ob/ob) mice: evidence that GIP is the major physiological incretin

Victor Gault, Finbarr O'Harte, P Harriott, MH Mooney, BD Green, Peter Flatt

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Abstract

Aims/hypothesis. This study examined the biological effects of the GIP receptor antagonist, (Pro(3))GIP and the GLP-1 receptor antagonist, exendin(9-39)amide. Methods Cyclic AMP production was assessed in Chinese hamster lung fibroblasts transfected with human GIP or GLP-1 receptors, respectively. In vitro insulin release studies were assessed in BRIN-BD11 cells while in vivo insulinotropic and glycaemic responses were measured in obese diabetic (ob/ob) mice. Results. In GIP receptor-transfected fibroblasts, (Pro(3))-GIP or exendin(9-39)amide inhibited GIP-stimulated cyclic AMP production with maximal inhibition of 70.0+/-3.5% and 73.5+/-3.2% at 10(-6) mol/l, respectively. In GLP-1 receptor-transfected fibroblasts, exendin-(9-39)amide inhibited GLP-1-stimulated cyclic AMP production with maximal inhibition of 60+/-0.7% at 10(-6) Mol/l, whereas (Pro(3))GIP had no effect. (Pro(3))GIP specifically inhibited GIP-stimulated insulin release (86%;p
Original languageEnglish
Pages (from-to)222-230
JournalDiabetologia
Volume46
Issue number2
DOIs
Publication statusPublished - Feb 2003

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