Hypoxia-inducible factor-1α protein negatively regulates load-induced bone formation

Ryan C. Riddle, Julie M. Leslie, Ted S. Gross, Thomas L. Clemens

Research output: Contribution to journalArticle

Abstract

Mechanical loads induce profound anabolic effects in the skeleton, but the molecular mechanisms that transduce such signals are still poorly understood. In this study, we demonstrate that the hypoxia-inducible factor-1α (Hif-1α) is acutely up-regulated in response to exogenous mechanical stimuli secondary to prostanoid signaling and Akt/mTOR (mammalian target of rapamycin) activation. In this context, Hif-1α associates with β-catenin to inhibit Wnt target genes associated with bone anabolic activity. Mice lacking Hif-1α in osteoblasts and osteocytes form more bone when subjected to tibia loading as a result of increased osteoblast activity. Taken together, these studies indicate that Hif-1α serves as a negative regulator of skeletal mechanotransduction to suppress load-induced bone formation by altering the sensitivity of osteoblasts and osteocytes to mechanical signals.

Original languageEnglish (US)
Pages (from-to)44449-44456
Number of pages8
JournalJournal of Biological Chemistry
Volume286
Issue number52
DOIs
StatePublished - Dec 30 2011

    Fingerprint

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this