O'Harte, Finbarr, Abdel-Wahab, Yasser, Conlon, JM and Flatt, Peter (1998) Amino terminal glycation of gastric inhibitory polypeptide enhances its insulinotropic action on clonal pancreatic B-cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS, 1425 (2). pp. 319-327. [Journal article]
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Gastric inhibitory polypeptide (GIP) is a potent insulin-releasing hormone of the enteroinsular axis. This study has examined glycation of GIP and effects of such structural modification on insulin secretion from a glucose-responsive clonal pancreatic B-cell line (BRIN-BD11). Monoglycated GIP (M-r 5149.5) was prepared by incubation with D-glucose under reducing conditions and purified by HPLC. Automated Edman degradation and mass spectrometric analysis indicated that GIP was specifically glycated at the amino terminus. Tn acute (20 min) incubations at 5.6 mM glucose, GIP (3 X 10(-11)-10(-8) M) significantly stimulated insulin secretion by 1.6-2.1-fold from BRIN-BD11 cells. The stimulatory effect induced by GIP over this concentration range was further enhanced by 1.5-2.5-fold following N-terminal glycation. These data indicate that GIP can be glycated under hyperglycaemic conditions at the amino terminal Tyr(1), and that this modification increases the glucose-dependent insulinotropic action of the peptide. (C) 1998 Elsevier Science B.V. All rights reserved.
|Item Type:||Journal article|
|Faculties and Schools:||Faculty of Life and Health Sciences|
Faculty of Life and Health Sciences > School of Biomedical Sciences
|Research Institutes and Groups:||Biomedical Sciences Research Institute|
Biomedical Sciences Research Institute > Diabetes
|Deposited By:||Professor Peter Flatt|
|Deposited On:||08 Jan 2010 14:29|
|Last Modified:||11 Jun 2010 12:06|
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