| First Author | Yamada PM | Year | 2010 |
| Journal | Endocrinology | Volume | 151 |
| Issue | 12 | Pages | 5741-50 |
| PubMed ID | 20926583 | Mgi Jnum | J:168345 |
| Mgi Id | MGI:4888070 | Doi | 10.1210/en.2010-0672 |
| Citation | Yamada PM, et al. (2010) Evidence of a role for insulin-like growth factor binding protein (IGFBP)-3 in metabolic regulation. Endocrinology 151(12):5741-50 |
| abstractText | IGF-binding protein (IGFBP)-3 is a metabolic regulator that has been shown to inhibit insulin-stimulated glucose uptake in murine models. This finding contrasts with epidemiological evidence of decreased serum IGFBP-3 in patients with type 2 diabetes. The purpose of this study was to clarify the role of IGFBP-3 in metabolism. Four-week-old male IGFBP-3(-/-) and control mice were subjected to a high-fat diet (HFD) for 12 wk. IGFBP-3(-/-) mice were heavier before the initiation of HFD and at the end of the study period. Resting metabolic rate was significantly decreased in knockout mice; however, respiratory exchange ratio was not significantly different. Fasting blood glucose and insulin levels were significantly elevated in IGFBP-3(-/-) mice. However, IGFBP-3(-/-) mice had relatively normal glucose tolerance because the relative glucose excursion over time was not different between the groups. During hyperinsulinemic clamps, IGFBP-3(-/-) mice had increased basal hepatic glucose production, but after insulin stimulation, no differences in hepatic glucose production were observed. A second cohort of older IGFBP-3(-/-) mice on HFD displayed unexpected evidence of hepatic steatosis. In summary, glucose tolerance and clamp testing indicate that IGFBP-3(-/-) mice preserve insulin sensitivity despite evidence of increased basal glucose turnover and hepatic steatosis. We provide evidence that genetic deletion of IGFBP-3 modulates hepatic carbohydrate and lipid metabolism. |
