Glucose-dependent insulinotropic polypeptide deficiency reduced fat accumulation and insulin resistance, but deteriorated bone loss in ovariectomized mice.
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| Abstract |
Given the established roles of glucose-dependent insulinotropic polypeptide (GIP) in promoting fat storage and bone formation, we assessed the contribution of GIP to obesity and osteopenia in ovariectomized mice with a gene encoding green fluorescent protein (GFP) inserted into the GIP locus, in which GIP was either reduced (GIPgfp/+ ) or absent (GIPgfp/gfp ). In GIPgfp/gfp mice, weight gain, subcutaneous and visceral fat mass were reduced, and glucose intolerance was improved compared with wild-type mice with the same magnitude of insulin responses. Cancellous bone mineral density and bone cortical thickness were reduced in GIPgfp/gfp mice compared with wild-type mice. In GIPgfp/+ mice, weight gain, glucose intolerance and cancellous bone mineral density were not different from that of wild-type mice. These results indicate that the total elimination of GIP ameliorates weight gain and adiposity in ovariectomized mice, but it enhances osteopenia, particularly in cancellous bone by partly suppressing bone formation.
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| Authors | Satoko Shimazu-Kuwahara, Yoshinori Kanemaru, Norio Harada, Eri Ikeguchi, Yohei Ueda, Shunsuke Yamane, Yuki Murata, Akihiro Yasoda, Timothy J Kieffer, Nobuya Inagaki |
| Journal | Journal of diabetes investigation (J Diabetes Investig) Vol. 10 Issue 4 Pg. 909-914 (Jul 2019) ISSN: 2040-1124 [Electronic] Japan |
| PMID | 30451382 (Publication Type: Journal Article) |
| Copyright | © 2018 The Authors. Journal of Diabetes Investigation published by Asian Association for the Study of Diabetes (AASD) and John Wiley & Sons Australia, Ltd. |
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