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RANKing intracellular signaling in osteoclasts
1Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA. xfeng@path.uab.edu
IUBMB Life
|July 14, 2005
Summary
Receptor Activator of NF-kappaB Ligand (RANKL) is crucial for osteoclast function. This review details RANK signaling pathways and how factors like interferons (IFNs) and costimulatory signals crosstalk with RANK signaling to regulate bone resorption.
Area of Science:
- Cell Biology
- Molecular Biology
- Immunology
Background:
- Osteoclasts are key bone-resorbing cells, and their differentiation, function, and survival are regulated by Receptor Activator of NF-kappaB Ligand (RANKL).
- RANKL binds to its receptor, RANK, activating multiple signaling pathways including NFATc1, NF-kappaB, Akt/PKB, JNK, ERK, and p38, which are critical for osteoclastogenesis.
Purpose of the Study:
- To review the current understanding of RANK signaling pathways in osteoclasts.
- To discuss the crosstalk between RANK signaling and other regulatory factors involved in osteoclastogenesis.
Main Methods:
- Literature review of recent studies on RANK signaling and its regulation.
- Analysis of molecular mechanisms underlying osteoclast differentiation and function.
Main Results:
- RANK signaling activates key pathways essential for osteoclast activity.
- Interferon-gamma (IFN-gamma) and Interferon-beta (IFN-beta) inhibit osteoclastogenesis through distinct mechanisms, involving TRAF6 degradation and c-fos downregulation, respectively.
- ITAM-activated costimulatory signals promote osteoclastogenesis by activating NFATc1 via FcRgamma and DAP12 adaptors.
Conclusions:
- RANK signaling is a central hub for osteoclast regulation.
- Crosstalk between RANK and various signaling molecules, including IFNs and costimulatory signals, provides intricate control over osteoclastogenesis.