title: Tumor necrosis factor alpha-induced osteoclastogenesis requires tumor necrosis factor receptor-associated factor 6.
abstract: Although tumor necrosis factor receptor-associated factor 6 (TRAF6) is required in receptor activator of NF-kappaB-receptor activator of NF-kappaB ligand (RANK-RANKL) signaling for osteoclastogenesis, it has remained unclear whether TRAF6 is crucial in tumor necrosis factor alpha (TNF-alpha)-induced osteoclastogenesis. We examined TRAF6 function in the TNF-alpha-induced osteoclastogenesis by using osteoclast progenitor cells from TRAF6-deficient mice. The results indicated that TNF-alpha did not effectively induce osteoclast differentiation from osteoclast progenitor cells derived from these mice into mature multinucleated osteoclasts, although c-jun N-terminal kinase (JNK) and TNF-alpha activation was observed in osteoclast progenitor cells. Thus, we have provided the first evidence showing that TRAF6 is involved in TNF-alpha-induced osteoclastogenesis.
authors.affiliation: Department of Life Science, Tokyo Institute of Technology, Yokohama, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kaji
authors.forename: R
authors.initials: R
authors.lastname: Katogi
authors.forename: Y
authors.initials: Y
authors.lastname: Azuma
authors.forename: A
authors.initials: A
authors.lastname: Naito
authors.forename: J I
authors.initials: JI
authors.lastname: Inoue
authors.forename: A
authors.initials: A
authors.lastname: Kudo
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D048031:JNK Mitogen-Activated Protein Kinases; D051379:Mice; D018345:Mice, Knockout; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D016328:NF-kappa B / Q000378:metabolism; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D010012:Osteogenesis / Q000502:physiology*; D011506:Proteins / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D018124:Receptors, Tumor Necrosis Factor / Q000378:metabolism*; D015398:Signal Transduction; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D048029:TNF Receptor-Associated Factor 6; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism* / Q000494:pharmacology; D015854:Up-Regulation
chemical_list: D016328:NF-kappa B; D011506:Proteins; D018124:Receptors, Tumor Necrosis Factor; D048029:TNF Receptor-Associated Factor 6; D014409:Tumor Necrosis Factor-alpha; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases