| Literature DB >> 17937928 |
Chizumi Yamada1, Yuichiro Yamada, Katsushi Tsukiyama, Kotaro Yamada, Shunsuke Yamane, Norio Harada, Kazumasa Miyawaki, Yutaka Seino, Nobuya Inagaki.
Abstract
Aging is associated with increased fat mass and decreased lean mass, which is strongly associated with the development of insulin resistance. Gastric inhibitory polypeptide (GIP) is known to promote efficient storage of ingested nutrients into adipose tissue; we examined aging-associated changes in body composition using 10-week-old and 50-week-old wild-type (WT) and GIP receptor knockout (Gipr-/-) mice on a normal diet, which show no difference in body weight. We found that Gipr-/- mice showed significantly reduced fat mass without reduction of lean mass or food intake, while WT mice showed increased fat mass and decreased lean mass associated with aging. Moreover, aged Gipr-/- mice showed improved insulin sensitivity, which is associated with amelioration in glucose tolerance, higher plasma adiponectin levels, and increased spontaneous physical activity. We therefore conclude that genetic inactivation of GIP signaling can prevent the development of aging-associated insulin resistance through body composition changes.Entities:
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Year: 2007 PMID： 17937928 DOI： 10.1016/j.bbrc.2007.09.128
Source DB: PubMed Journal: Biochem Biophys Res Commun ISSN： 0006-291X Impact factor: 3.575