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Identification and Characterization of the Precursors Committed to Osteoclasts Induced by TNF-Related Activation-Induced Cytokine/Receptor Activator of NF-B Ligand¹

Ayako Mochizuki^2,*,, Masamichi Takami^2,3,*, Tadaharu Kawawa, Reina Suzumoto, Takahisa Sasaki, Akihiko Shiba, Hiroaki Tsukasaki, Baohong Zhao^*, Rika Yasuhara^*, Tetsuo Suzawa^*, Yoichi Miyamoto^*, Yongwon Choi and Ryutaro Kamijo^*

^* Department of Biochemistry, School of Dentistry, Showa University, Tokyo, Japan; Department of Prosthodontics, School of Dentistry, Showa University, Tokyo, Japan; Department of Oral Histology, School of Dentistry, Showa University, Tokyo, Japan; and Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104

Osteoclasts are terminally differentiated from cells of monocyte/macrophage lineage by stimulation with TNF-related activation-induced cytokine (TRANCE) (receptor activator of NF-B ligand/osteoprotegerin ligand/osteoclast differentiation factor/TNFSF11/CD254). In the present study, we attempted to determine when and how the cell fate of precursors becomes committed to osteoclasts following TRANCE stimulation. Although mouse bone marrow-derived macrophages (BMMs) were able to differentiate into either osteoclasts or dendritic cells, the cells no longer differentiated into dendritic cells after treatment with TRANCE for 24 h, indicating that their cell fate was committed to osteoclasts. Committed cells as well as BMMs were still quite weak in tartrate-resistant acid phosphatase activity, an osteoclast marker, and incorporated zymosan particles by phagocytosis. Interestingly, committed cells, but not BMMs, could still differentiate into osteoclasts even after incorporation of the zymosan particles. Furthermore, IL-4 and IFN-, potent inhibitors of osteoclast differentiation, failed to inhibit osteoclast differentiation from committed cells, and blocking of TRANCE stimulation by osteoprotegerin resulted in cell death. Adhesion to culture plates was believed to be essential for osteoclast differentiation; however, committed cells, but not BMMs, differentiated into multinucleated osteoclasts without adhesion to culture plates. Although LPS activated the NF-B-mediated pathway in BMMs as well as in committed cells, the mRNA expression level of TNF- in the committed cells was significantly lower than that in BMMs. These results suggest that characteristics of the committed cells induced by TRANCE are distinctively different from that of BMMs and osteoclasts.

The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ This work is supported by High-Tech Research Center Project for Private Universities from Ministry of Education, Culture, Sports, Science, and Technology, Japan, 2005–2009, and by Grants-in-Aid for Scientific Research from Japan Society for the Projection of Science.

² A.M. and M.T. contributed equally to this work.

³ Address correspondence and reprint requests to Dr. Masamichi Takami, Department of Biochemistry, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa, Tokyo 142-8555, Japan. E-mail address: takami{at}dent.showa-u.ac.jp

⁴ Abbreviations used in this paper: TRANCE, TNF-related activation-induced cytokine; BMM, bone marrow-derived macrophage; DAPI, 4',6'-diamidino-2-phenylindole dihydrochloride; ODF, osteoclast differentiation factor; OPG, osteoprotegerin; OSCAR, osteoclast-associated receptor; PI, propidium iodide; RANKL, receptor activator of NF-B ligand; TRAP, tartrate-resistant acid phosphatase.

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