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- W3176848374 abstract "Tumor necrosis factor receptor-associated factors (TRAFs) are crucial for receptor activator of nuclear factor-κB (RANK) activation in osteoclasts. However, the upstream mechanisms of TRAF members in the osteoclastic lineage remain largely unknown. Here, we demonstrated that Rictor, a key component of mechanistic target of rapamycin complex 2 (mTORC2), was crucial for TRAF6/TRAF3 expression in osteoclasts. Our ex vivo and in vivo studies showed that Rictor ablation from the osteoclastic lineage reduced osteoclast numbers and increased bone mass in mice. Mechanistically, we found that Rictor ablation restricted osteoclast formation, which disrupted TRAF6 stability and caused autophagy block in a manner distinct from mTORC1, resulting in reduced TRAF3 degradation. Boosting TRAF6 expression or knockdown of TRAF3 levels in Rictor-deficient cells could both overcome the defect. Moreover, Rictor could interact with TRAF6 upon RANK ligand (RANKL) stimulation and loss of Rictor impaired TRAF6 stability and promoted its ubiquitinated degradation. These findings established an innovative link between Rictor, TRAF protein levels, and autophagic block. More importantly, mTOR complexes in the osteoclastic lineage are likely switches for coordinating TRAF6 and TRAF3 protein levels, and Rictor may function as an essential upstream regulator of TRAF6/TRAF3 that is partially independent of mTORC1 activity. Inhibitors targeting Rictor may therefore be valuable for preventing or treating osteoclast-related diseases. © 2021 American Society for Bone and Mineral Research (ASBMR)." @default.
- W3176848374 created "2021-07-05" @default.
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- W3176848374 date "2021-07-01" @default.
- W3176848374 modified "2023-10-18" @default.
- W3176848374 title "Rictor Is a Novel Regulator of <scp>TRAF6</scp>/<scp>TRAF3</scp> in Osteoclasts" @default.
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- W3176848374 doi "https://doi.org/10.1002/jbmr.4398" @default.
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