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• W2076277189 abstract "An excess of osteoclastic bone resorption relative to osteoblastic bone formation results in progressive bone loss, characteristic of osteoporosis. Understanding the mechanisms of osteoclast differentiation is essential to develop novel therapeutic approaches to prevent and treat osteoporosis. We showed previously that Wrch1/RhoU is the only RhoGTPase whose expression is induced by RANKL during osteoclastogenesis. It associates with podosomes and the suppression of Wrch1 in osteoclast precursors leads to defective multinucleated cell formation. Here we further explore the functions of this RhoGTPase in osteoclasts, using RAW264.7 cells and bone marrow macrophages as osteoclast precursors. Suppression of Wrch1 did not prevent induction of classical osteoclastic markers such as NFATc1, Src, TRAP (Tartrate-Resistant Acid Phosphatase) or cathepsin K. ATP6v0d2 and DC-STAMP, which are essential for fusion, were also expressed normally. Similar to the effect of RANKL, we observed that Wrch1 expression increased osteoclast precursor aggregation and reduced their adhesion onto vitronectin but not onto fibronectin. We further found that Wrch1 could bind integrin ß3 cytoplasmic domain and interfered with adhesion-induced Pyk2 and paxillin phosphorylation. Wrch1 also acted as an inhibitor of M-CSF-induced prefusion osteoclast migration. In mature osteoclasts, high Wrch1 activity inhibited podosome belt formation. Nevertheless, it had no effect on mineralized matrix resorption. Our observations suggest that during osteoclastogenesis, Wrch1 potentially acts through the modulation of αvß3 signaling to regulate osteoclast precursor adhesion and migration and allow fusion. As an essential actor of osteoclast differentiation, the atypical RhoGTPase Wrch1/RhoU could be an interesting target for the development of novel antiresorptive drugs." @default.
• W2076277189 created "2016-06-24" @default.
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• W2076277189 date "2009-06-01" @default.
• W2076277189 modified "2023-10-02" @default.
• W2076277189 title "The Rho GTPase Wrch1 regulates osteoclast precursor adhesion and migration" @default.
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• W2076277189 doi "https://doi.org/10.1016/j.biocel.2008.12.007" @default.
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