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Osteoporosis International

, Volume 24, Issue 9, pp 2377–2386 | Cite as

NF-κB signaling and bone resorption

  • Y. Abu-Amer
Review

Abstract

The transcription factor NF-κB is a family of proteins involved in signaling pathways essential for normal cellular functions and development. Deletion of various components of this pathway resulted with abnormal skeletal development. Research in the last decade has established that NF-κB signaling mediates RANK ligand-induced osteoclastogenesis. Consistently, it was shown that inhibition of NF-κB was an effective approach to inhibit osteoclast formation and bone resorptive activity. Identification of the molecular machinery underlying NF-κB activation permitted osteoclast-specific deletion of the major components of this pathway. As a result, it was clear that deletion of members of the proximal IKK kinase complex and the distal NF-κB subunits and downstream regulators affected skeletal development. These studies provided several targets of therapeutic intervention in osteolytic diseases. NF-κB activity has been also described as the centerpiece of inflammatory responses and is considered a potent mediator of inflammatory osteolysis. Indeed, inflammatory insults exacerbate physiologic RANKL-induced NF-κB signals leading to exaggerated responses and to inflammatory osteolysis. These superimposed NF-κB activities appear to underlie several bone pathologies. This review will describe the individual roles of NF-κB molecules in bone resorption and inflammatory osteolysis.

Keywords

IKK NF-κB Osteoclast Osteolysis 

Notes

Acknowledgments

The author is supported by grants from the National Institute of Health/NIAMS (AR-049192, AR-054326) and the Shriners Hospital for Children (No. 85600).

Conflicts of interest

None.

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2013

Authors and Affiliations

  1. 1.Department of Orthopedic Surgery, Department of Cell Biology & PhysiologyWashington University School of MedicineSaint LouisUSA

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