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Gastric Inhibitory Polypeptide Analogues

Do They Have a Therapeutic Role in Diabetes Mellitus Similar to That of Glucagon-Like Peptide-1?

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Abstract

Gastric inhibitory polypeptide (GIP, also called glucose-dependent insulinotropic polypeptide) and glucagon-like peptide-1 (GLP-1) are peptide hormones from the gut that enhance nutrient-stimulated insulin secretion (the ‘incretin’ effect). Judging from experiments in mice with targeted deletions of GIP and GLP-1 receptors, the incretin effect is essential for normal glucose tolerance. In patients with type 2 diabetes mellitus it turns out that the incretin effect is severely impaired or abolished. The explanation seems to be that both the secretion of GLP-1 and the effect of GIP are impaired (whereas both the secretion of GIP and the effect of GLP-1 are near normal). The impaired GLP-1 secretion is probably a consequence of diabetic metabolic disturbances. The known genetic variations in the GIP receptor sequence are not associated with type 2 diabetes mellitus, but a defective insulinotropic effect of GIP may be found in first degree relatives of the patients, suggesting a genetic background for the defect. The molecular nature of the defect is not known and given the close similarity of the two receptors and their signalling, the dissociation of their effects is remarkable. Whereas GLP-1 and its analogues are attractive as therapeutic agents for type 2 diabetes mellitus, analogues of GIP are unlikely to be effective. On the other hand, GIP seems to play an important role in lipid metabolism, promoting the disposal of ingested lipids, and mice with a targeted deletion of the GIP receptor do not become obese when exposed to a high-fat diet. Therefore, antagonistic analogues of GIP may be speculated to have a role in the pharmaceutical management of obesity.

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There are no potential conflicts of interest. The author’s work was supported by grants from The Danish Medical Research Council.

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  1. Department of Medical Physiology, University of Copenhagen, The Panum Institute, Blegdamsvej 3, Copenhagen N, DK-2200, Denmark

    Jens J. Holst

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Holst, J.J. Gastric Inhibitory Polypeptide Analogues. BioDrugs 16, 175–181 (2002). https://doi.org/10.2165/00063030-200216030-00002

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