Abstract
The osteoclasts are bone-resorbing multinucleatedcells formed by the fusion of mononuclearpreosteoclasts (pOCs) of hematopoietic origin.Although receptor activator of NF-κBligand (RANKL) has been shown to regulate osteoclastdifferentiation and function, its effect on the fusionof pOCs into multinucleated osteoclast-like cells(OCLs) has not been known. Using our fusion assaysystem, that is not contaminated with multinucleatedcells (MNCs) and osteoblastic cells, we determined theeffect of RANKL on the fusion of pOCs into MNCs. WhenpOCs were cultured on the plates, most of pOCs diedand disappeared from the plates within 24 h in theabsence of additives, but pOCs were fused to MNCswithin 6 h in the presence of RANKL. RANKL-inducedMNCs showed typical properties of OCL such astartrate-resistant acid phosphatase (TRAP) activity,actin ring formation, and bone-resorbing activity. Thefusion of pOCs into OCLs induced by osteoblastic cellsor RANKL was inhibited by OPG/OCIF, but that inducedby IL-1β was not. Both RANKL- andIL-1β-induced OCL formation from pOCs wasinhibited by ZLLL-H, a peptide inhibitor ofproteasome. These findings indicate that RANKLsupports the survival of pOCs and induces the fusionof pOCs into OCLs and suggest that NF-κBactivation is involved in these processes induced byRANKL and IL-1β.
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Woo, JT., Kato, M., Takami, M. et al. Receptor activator of NF-κB ligand induces the fusion of mononuclear preosteoclasts into multinucleated osteoclasts. Cytotechnology 33, 203–211 (2000). https://doi.org/10.1023/A:1008198120670
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DOI: https://doi.org/10.1023/A:1008198120670