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- Title
Chondrocyte β-Catenin Signaling Regulates Postnatal Bone Remodeling Through Modulation of Osteoclast Formation in a Murine Model.
- Authors
Wang, Baoli; Jin, Hongting; Zhu, Mei; Li, Jia; Zhao, Lan; Zhang, Yejia; Tang, Dezhi; Xiao, Guozhi; Xing, Lianping; Boyce, Brendan F.; Chen, Di
- Abstract
Objective To investigate whether β-catenin signaling in chondrocytes regulates osteoclastogenesis, thereby contributing to postnatal bone growth and bone remodeling. Methods Mice with conditional knockout (cKO) or conditional activation (cAct) of chondrocyte-specific β- catenin were generated. Changes in bone mass, osteoclast numbers, and osteoblast activity were examined. The mechanisms by which β-catenin signaling in chondrocytes regulates osteoclast formation were determined. Results The β- catenin cKO mice developed localized bone loss, whereas cAct mice developed a high bone mass phenotype. Histologic findings suggested that these phenotypes were caused primarily by impaired osteoclast formation, rather than impaired bone formation. Further molecular signaling analyses revealed that β-catenin signaling controlled this process by regulating the expression of the RANKL and osteoprotegerin (OPG) genes in chondrocytes. Activation of β-catenin signaling in chondrocytes suppressed Rankl gene transcription through a glucocorticoid receptor-dependent mechanism. The severe bone loss phenotype observed in β- catenin cKO mice was largely restored by treatment with human recombinant OPG or transgenic overexpression of Opg in chondrocytes. Conclusion β-catenin signaling in chondrocytes plays a key role in postnatal bone growth and bone remodeling through its regulation of osteoclast formation.
- Publication
Arthritis & Rheumatology, 2014, Vol 66, Issue 1, p107
- ISSN
2326-5191
- Publication type
Journal Article
- DOI
10.1002/art.38195