Characterisation and glucoregulatory actions of a novel acylated form of the (Pro3)GIP receptor antagonist in type 2 diabetes.

Abstract:

:In this study, we tested the biological activity of a novel acylated form of (Pro3)glucose-dependent insulinotropic polypetide [(Pro3)GIP] prepared by conjugating palmitic acid to Lys16 to enhance its efficacy in vivo by promoting binding to albumin and extending its biological actions. Like the parent molecule (Pro3)GIP, (Pro3)GIPLys16PAL was completely stable to the actions of DPP-IV and significantly (p<0.01 to p<0.001) inhibited GIP-stimulated cAMP production and cellular insulin secretion. Furthermore, acute administration of (Pro3)GIPLys16PAL also significantly (p<0.05 to p<0.001) countered the glucose-lowering and insulin-releasing actions of GIP in ob/ob mice. Daily injection of (Pro3)GIPLys16PAL (25 nmol/kg bw) in 14-18-week-old ob/ob mice over 14 days had no effect on body weight, food intake or non-fasting plasma glucose and insulin concentrations. (Pro3)GIPLys16PAL treatment also failed to significantly alter the glycaemic response to an i.p. glucose load or test meal, but insulin concentrations were significantly reduced (1.5-fold; p<0.05) after the glucose load. Insulin sensitivity was enhanced (1.3-fold; p<0.05) and pancreatic insulin was significantly reduced (p<0.05) in the (Pro3)GIPLys16PAL-treated mice. These data demonstrate that acylation of Lys16 with palmitic acid in (Pro3)GIP does not improve its biological effectiveness as a GIP receptor antagonist.

journal_name

Biol Chem

journal_title

Biological chemistry

authors

Gault VA,Hunter K,Irwin N,Greer B,Green BD,Harriott P,O'Harte FP,Flatt PR

doi

10.1515/BC.2007.019

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

173-9

issue

2

eissn

1431-6730

issn

1437-4315

journal_volume

388

pub_type

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