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Ubiquitin‐Specific Protease 34 Inhibits Osteoclast Differentiation by Regulating NF‐κB Signaling
Author(s) -
Li Qiwen,
Wang Mengyuan,
Xue Hanxiao,
Liu Weiqing,
Guo Yuchen,
Xu Ruoshi,
Shao Bin,
Yuan Quan
Publication year - 2020
Publication title -
journal of bone and mineral research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.882
H-Index - 241
eISSN - 1523-4681
pISSN - 0884-0431
DOI - 10.1002/jbmr.4015
Subject(s) - osteoclast , ubiquitin , microbiology and biotechnology , bone resorption , deubiquitinating enzyme , chemistry , conditional gene knockout , signal transduction , gene knockdown , nf κb , cellular differentiation , iκbα , biology , endocrinology , biochemistry , receptor , apoptosis , phenotype , gene
The ubiquitination and deubiquitination enzymes ensure the stability and proper function of most cellular proteins. Disturbance of either enzyme compromises tissue homeostasis. We recently have identified that the ubiquitin‐specific protease 34 (USP34) contributes to bone formation by promoting osteogenic differentiation of mesenchymal stem cells. However, its role in bone resorption, which couples bone formation, remains unknown. Here we show that knockdown of Usp34 promotes osteoclast differentiation of RAW264.7 cells. Conditional knockout of Usp34 in bone marrow–derived macrophages (BMMs) or in osteoclasts leads to elevated osteoclast function and low bone mass. Mechanically, we identify that USP34 restrains NF‐κB signaling by deubiquitinating and stabilizing the NF‐κB inhibitor alpha (IκBα). Overexpression of IκBα represses osteoclastic hyperfunction of Usp34 ‐deficient RAW264.7 cells. Collectively, our results show that USP34 inhibits osteoclastogenesis by regulating NF‐κB signaling. © 2020 American Society for Bone and Mineral Research.