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    Horm Metab Res. 2004 Nov-Dec;36(11-12):771-4.

    Physiology of GIP--a lesson from GIP receptor knockout mice.

    Yamada Y, Seino Y.

    Department of Diabetes and Clinical Nutrition, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan. yamada@metab.kuhp.kyoto-u.ac.jp

    A much greater insulin response is observed after oral glucose load than after intravenous injection of glucose. The hormonal factor(s) implicated as transmitters of signals from the gut to pancreatic beta-cells was referred to incretin; gastric inhibitory polypeptide or glucose-dependent insulinotropic polypeptide (GIP) is identified as one of the incretins. GIP exerts its effects by binding to its specific receptor, the GIP receptor, which is expressed in various tissues including pancreatic islets, adipose tissue, and brain. However, the physiological role of GIP has been generally thought to stimulate insulin secretion from pancreatic beta-cells, and the other actions of GIP have received little attention. We have bred and characterized mice with a targeted mutation of the GIP receptor gene. From these studies, we now know that GIP not only mediates early insulin secretion by acting on pancreatic beta-cells, but also links overnutrition to obesity by acting on adipocytes.

    PMID: 15655707 [PubMed - indexed for MEDLINE]

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