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- Title
hFcgγIIa: a double-edged sword in osteoclastogenesis and bone balance in transgenic mice.
- Authors
Jie Miao; Hong-Min Wang; Xiao-Hua Pan; Zheng Gong; Xiao-Ming Gao; Fang-Yuan Gong
- Abstract
Rheumatoid arthritis (RA) is a chronic autoimmune disease accompanied by local and systemic bone loss. Fcgγs, especially FcgRIIa (hFcgγIIa), have been implicated in the pathogenesis of RA. However, the contribution of hFcγgIIa to bone loss has not been fully elucidated. In the present study, we demonstrated the doubleedged sword role of hFcgγIIa on osteoclast differentiation through investigations involving hFcgγIIa-transgenic (hFcgγIIa-Tg) mice. Our findings reveal that hFcgRIIa-Tg mice, previously shown to exhibit heightened susceptibility to collagen-induced arthritis (CIA), displayed increased osteoporosis during CIA or at advanced ages (40 weeks), accompanied by heightened in vivo osteoclast differentiation. Notably, bone marrow cells from hFcgγIIa-Tg mice exhibited enhanced efficiency in differentiating into osteoclasts and bone resorption in vitro compared to wild-type mice when stimulated with receptor activators of NF-kB ligand (RANKL). Additionally, hFcgγIIa-Tg mice exhibited augmented sensitivity to RANKL-induced bone loss in vivo, highlighting the osteoclastpromoting role of hFcgγIIa. Mechanistically, bone marrow cells from hFcgγIIa-Tg mice displayed heightened Syk self-activation, leading to mTOR-pS6 pathway activation, thereby promoting RANKL-driven osteoclast differentiation. Intriguingly, while hFcgRIIa crosslinking hindered RANKL-induced osteoclast differentiation, it activated the kinase cAbl, subsequently triggering STAT5 activation and inhibiting the expression of osteoclast-associated genes. This study provides novel insights into hFcgγIIa-mediated osteoclast biology, suggesting promising therapeutic targets for managing bone remodeling disorders.
- Publication
Frontiers in Immunology, 2024, p1
- ISSN
1664-3224
- Publication type
Article
- DOI
10.3389/fimmu.2024.1425670