Inhibition of gastric inhibitory polypeptide signaling prevents obesity |
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Authors: | Miyawaki Kazumasa Yamada Yuichiro Ban Nobuhiro Ihara Yu Tsukiyama Katsushi Zhou Heying Fujimoto Shimpei Oku Akira Tsuda Kinsuke Toyokuni Shinya Hiai Hiroshi Mizunoya Wataru Fushiki Tohru Holst Jens Juul Makino Mitsuhiro Tashita Akira Kobara Yukari Tsubamoto Yoshiharu Jinnouchi Takayoshi Jomori Takahito Seino Yutaka |
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Affiliation: | Department of Diabetes and Clinical Nutrition, Graduate School of Medicine, Kyoto University, Kyoto, Japan. |
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Abstract: | Secretion of gastric inhibitory polypeptide (GIP), a duodenal hormone, is primarily induced by absorption of ingested fat. Here we describe a novel pathway of obesity promotion via GIP. Wild-type mice fed a high-fat diet exhibited both hypersecretion of GIP and extreme visceral and subcutaneous fat deposition with insulin resistance. In contrast, mice lacking the GIP receptor (Gipr(-/-)) fed a high-fat diet were clearly protected from both the obesity and the insulin resistance. Moreover, double-homozygous mice (Gipr(-/-), Lep(ob)/Lep(ob)) generated by crossbreeding Gipr(-/-) and obese ob/ob (Lep(ob)/Lep(ob)) mice gained less weight and had lower adiposity than Lep(ob)/Lep(ob) mice. The Gipr(-/-) mice had a lower respiratory quotient and used fat as the preferred energy substrate, and were thus resistant to obesity. Therefore, GIP directly links overnutrition to obesity and it is a potential target for anti-obesity drugs. |
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