Long-term oral administration of osteocalcin induces insulin resistance in male mice fed a high-fat, high-sucrose diet

Yu Yasutake, Akiko Mizokami, Tomoyo Kawakubo-Yasukochi, Sakura Chishaki, Ichiro Takahashi, Hiroshi Takeuchi, Masato Hirata

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Uncarboxylated osteocalcin (GluOC), a bone-derived hormone, regulates energy metabolism by stimulating insulin secretion, pancreatic β-cell proliferation, and adiponectin expression in adipocytes. Previously, we showed that long-term intermittent or daily oral administration of GluOC reduced the fasting blood glucose level, improved glucose tolerance, and increased the fasting serum insulin concentration as well as pancreatic β-cell area in female mice fed a normal or high-fat, high-sucrose diet. We have now performed similar experiments with male mice and found that such GluOC administration induced glucose intolerance, insulin resistance, and adipocyte hypertrophy in those fed a high-fat, high-sucrose diet. In addition, GluOC increased the circulating concentration of testosterone and reduced that of adiponectin in such mice. These phenotypes were not observed in male mice fed a high-fat, high-sucrose diet after orchidectomy, but they were apparent in orchidectomized male mice or intact female mice that were fed such a diet and subjected to continuous testosterone supplementation. Our results thus reveal a sex difference in the effects of GluOC on glucose homeostasis. Given that oral administration of GluOC has been considered a potentially safe and convenient option for the treatment or prevention of metabolic disorders, this sex difference will need to be taken into account in further investigations.

Original languageEnglish
Pages (from-to)E662-E675
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume310
Issue number8
DOIs
Publication statusPublished - Apr 15 2016

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Physiology (medical)

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