Open AccessGlucose‐dependent insulinotropic polypeptide deficiency reduced fat accumulation and insulin resistance, but deteriorated bone loss in ovariectomized mice
Author(s) -
ShimazuKuwahara Satoko,
Kanemaru Yoshinori,
Harada Norio,
Ikeguchi Eri,
Ueda Yohei,
Yamane Shunsuke,
Murata Yuki,
Yasoda Akihiro,
Kieffer Timothy J,
Inagaki Nobuya
Publication year - 2019
Publication title -
journal of diabetes investigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.089
H-Index - 50
eISSN - 2040-1124
pISSN - 2040-1116
DOI - 10.1111/jdi.12978
Subject(s) - ovariectomized rat , endocrinology , osteopenia , medicine , cancellous bone , insulin resistance , bone mineral , type 2 diabetes , weight gain , adipose tissue , cortical bone , obesity , diabetes mellitus , osteoporosis , estrogen , body weight , anatomy
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 (GIP gfp/+ ) or absent (GIP gfp/gfp ). In GIP gfp/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 GIP gfp/gfp mice compared with wild‐type mice. In GIP gfp/+ 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.