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Zeng KQ, Gong FY, Pan XH, Miao J, Gong Z, Wang J, Zhong Q, Dai XQ, Gao XM. IgG Immunocomplexes Drive the Differentiation of a Novel Subset of Osteoclasts Independent of RANKL and Inflammatory Cytokines. J Bone Miner Res 2021; 36:1174-1188. [PMID: 33651383 DOI: 10.1002/jbmr.4281] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 12/14/2022]
Abstract
Potentiation of receptor activator of NF-κB ligand (RANKL)-induced osteoclastogenesis by IgG immunocomplexes (ICs) is generally considered an important pathway leading to cartilage and bone destruction in rheumatoid arthritis (RA). However, whether IgG ICs possess pro-osteoclastogenic potential independent of RANKL and inflammatory cytokines is unclear. Here we demonstrate that by fully cross-linking human FcγRIIa (hFcγRIIa) or co-ligating hFcγRIIa and TLR4, IgG ICs alone could drive the differentiation of human blood monocytes into nuclear factor of activated T cells cytoplasmic 1 (NFATc1-negative nonclassical osteoclasts (NOCs). Surprisingly, IgG ICs could also overrule RANKL-induced classical osteoclast (COC) differentiation in vitro. In mouse model of collagen-induced arthritis, hFcγRIIa-transgenic, but not nontransgenic control, mice suffered from cartilage/bone destruction accompanied by the presence of NFATc1- NOCs lining the eroded cartilage surface in affected joints. Our results not only identify a novel subset of IC-induced NOCs but also provide a possible explanation for the uncoupling of FcγR-mediated cartilage destruction from RANKL-related bone erosion in autoinflammatory arthritis. © 2021 American Society for Bone and Mineral Research (ASBMR)..
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Affiliation(s)
- Ke-Qin Zeng
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China.,Department of Rheumatology, The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Fang-Yuan Gong
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China.,Key Laboratory of Systemic Biology of Suzhou, Suzhou, China
| | - Xiao-Hua Pan
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Jie Miao
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Zheng Gong
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Jun Wang
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China.,Key Laboratory of Systemic Biology of Suzhou, Suzhou, China
| | - Qiao Zhong
- Department of Laboratory Medicine, Suzhou Municipal Hospital, Suzhou, China
| | - Xia-Qiu Dai
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China.,Key Laboratory of Systemic Biology of Suzhou, Suzhou, China
| | - Xiao-Ming Gao
- Institute of Biology and Medical Sciences, School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China.,Key Laboratory of Systemic Biology of Suzhou, Suzhou, China
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