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Stimulation of Notch Signaling in Mouse Osteoclast Precursors
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Transforming growth factor-beta enables NFATc1 expression during osteoclastogenesis.

S W Fox1, K E Evans, A C Lovibond

  • 1School of Biological Science, Ecotoxicology and Stress Biology Group, Room 404 Davy, University of Plymouth, PL4 8AA, UK.

Biochemical and Biophysical Research Communications
|December 7, 2007
PubMed
Summary
This summary is machine-generated.

Transforming growth factor-beta (TGF-β) primes monocytes for osteoclast formation within 24 hours by regulating NFATc1 expression. This process is crucial for coordinated osteoclast differentiation involving RANKL and TNF-α.

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Area of Science:

  • Cell Biology
  • Immunology
  • Bone Biology

Background:

  • Osteoclastogenesis, the formation of bone-resorbing cells, requires specific priming and activating signals.
  • Transforming growth factor-beta (TGF-β) is a known cytokine that primes monocytes for osteoclast differentiation, enhancing responses to RANKL and TNF-α.
  • The exact timing and molecular mechanisms by which TGF-β influences early osteoclastogenesis remain unclear.

Purpose of the Study:

  • To investigate the temporal role of TGF-β in monocyte priming for osteoclastogenesis.
  • To elucidate the molecular mechanisms by which TGF-β regulates osteoclast differentiation.
  • To determine the interplay between TGF-β, RANKL, and TNF-α in controlling NFATc1 during early osteoclast formation.

Main Methods:

  • Monocyte culture and differentiation assays.
  • Analysis of NFATc1 expression and localization (cytoplasmic and nuclear).
  • Treatment with TGF-β, RANKL, and TNF-α at different time points.

Main Results:

  • TGF-β directly induces cytoplasmic NFATc1 expression in monocytes within 24 hours.
  • TGF-β alone does not promote NFATc1 nuclear translocation.
  • RANKL-induced NFATc1 expression and TNF-α-mediated osteoclastogenesis are dependent on TGF-β presence during early differentiation stages.
  • TNF-α facilitates osteoclastogenesis by promoting the nuclear translocation of TGF-β-induced NFATc1.

Conclusions:

  • Osteoclast formation is critically dependent on the coordinated action of TGF-β with RANKL and TNF-α.
  • TGF-β regulates the expression and intracellular localization of NFATc1, a key transcription factor, during the initial phases of osteoclast differentiation.
  • These findings reveal a novel mechanism for TGF-β in controlling early osteoclastogenesis.