期刊
MOLECULAR AND CELLULAR BIOLOGY
卷 31, 期 23, 页码 4706-4719出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.05980-11
关键词
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资金
- University of Texas Southwestern Medical Center
- BD Biosciences Research Grant
- CPRIT [RP100841]
- March of Dimes [5-FY10-1]
- Welch Foundation [I-1751]
- NIH [R01 DK089113, R01 DK066556, R01 DK064261, R01 DK088220]
- American Heart Association South Central Affiliate
Wnt/beta-catenin signaling is a critical regulator of skeletal physiology. However, previous studies have mainly focused on its roles in osteoblasts, while its specific function in osteoclasts is unknown. This is a clinically important question because neutralizing antibodies against Wnt antagonists are promising new drugs for bone diseases. Here, we show that in osteoclastogenesis, beta-catenin is induced during the macrophage colony-stimulating factor (M-CSF)-mediated quiescence-to-proliferation switch but suppressed during the RANKL-mediated proliferation-to-differentiation switch. Genetically, beta-catenin deletion blocks osteoclast precursor proliferation, while beta-catenin constitutive activation sustains proliferation but prevents osteoclast differentiation, both causing osteopetrosis. In contrast, beta-catenin heterozygosity enhances osteoclast differentiation, causing osteoporosis. Biochemically, Wnt activation attenuates whereas Wnt inhibition stimulates osteoclastogenesis. Mechanistically, beta-catenin activation increases GATA2/Evi1 expression but abolishes RANKL-induced c-Jun phosphorylation. Therefore, beta-catenin exerts a pivotal biphasic and dosage-dependent regulation of osteoclastogenesis. Importantly, these findings suggest that Wnt activation is a more effective treatment for skeletal fragility than previously recognized that confers dual anabolic and anti-catabolic benefits.
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