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Published on: February 28, 2017
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
Summary
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.
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.
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