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FoxO1: a molecule for all seasons.

Stavroula Kousteni1

  • 1Department of Medicine, Division of Endocrinology, College of Physicians and Surgeons, Columbia University, New York, NY, USA. sk2836@columbia.edu

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|May 5, 2011
PubMed
Summary

Forkhead box O1 (FoxO1) transcription factors regulate bone homeostasis and glucose metabolism. FoxO1 promotes osteoblast proliferation while also influencing glucose regulation through osteocalcin, integrating skeletal and metabolic functions.

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Area of Science:

  • Molecular Biology
  • Endocrinology
  • Skeletal Biology

Background:

  • The Forkhead box O (FoxO) transcription factors are key regulators of conserved signaling pathways.
  • FoxO proteins control vital cellular functions including differentiation, proliferation, survival, metabolism, tumor suppression, and antioxidant defense.
  • FoxO1 is a primary target of insulin signaling, crucial for metabolic homeostasis and organismal survival.

Purpose of the Study:

  • To investigate the unique role of FoxO1 in skeletal biology and its dual function in bone homeostasis and glucose metabolism.
  • To elucidate how FoxO1 regulates osteoblast proliferation and the endocrine function of the skeleton.

Main Methods:

  • The study focuses on the molecular mechanisms of FoxO1 action in osteoblasts and its impact on glucose-regulating tissues.
  • Analysis of FoxO1's direct effects on osteoblast proliferation, protein synthesis, and redox balance.
  • Investigation of FoxO1's indirect endocrine actions via osteocalcin on pancreatic beta cells and hepatocytes.

Main Results:

  • FoxO1 directly promotes osteoblast proliferation by maintaining protein synthesis and redox balance, thus supporting bone homeostasis.
  • FoxO1 exerts endocrine effects through osteocalcin, suppressing glucose production and decreasing insulin sensitivity and production.
  • These opposing actions highlight an integrated physiological mechanism linking skeletal and metabolic health.

Conclusions:

  • FoxO1 plays a dual role in skeletal biology, promoting bone health directly and modulating glucose metabolism indirectly.
  • The integration of skeletal and metabolic functions by FoxO1 represents an adaptive response beneficial for whole-body physiology during stress and aging.
  • Understanding FoxO1's multifaceted roles offers insights into treating metabolic disorders and bone diseases.