title: Osteoclast lineage commitment of bone marrow precursors through expression of membrane-bound TRANCE.
abstract: Osteoclast formation from hemopoietic precursors is induced by TRANCE (also called RANKL, ODF, and OPGL), a membrane-bound ligand expressed by bone marrow stromal cells. Because soluble recombinant TRANCE is a suboptimal osteoclastogenic stimulus, and to eliminate the need for such dependence on stromal cells, membrane-bound TRANCE was expressed in hematopoietic precursors using retroviral gene transfer. Four TRANCE-expressing osteoclast cell lines were established that continuously generate large numbers of multinucleated cells and express tartrate-resistant acid phosphatase and calcitonin receptors. The multinuclear cells are long-lived and either fuse continuously with each other and with mononuclear cells to form enormous syncytia, or separate to form daughter multinuclear cells. When formed on bone, but not on plastic, the majority of multinuclear cells develop actin rings on bone, and resorb bone, suggesting that bone matrix may provide additional signals that facilitate osteoclastic functional maturation. Surprisingly, multinuclear cells originate from fusion of proliferating mononuclear cells that strongly express the mature macrophage markers F4/80 and Fc receptor, which are not expressed by osteoclasts. These results indicate that osteoclasts can be derived from F4/80-positive and Fc receptor-positive cells, and that TRANCE induces osteoclastic differentiation partly by suppressing the macrophage phenotype.
authors.affiliation: Department of Histopathology, St. George's Hospital Medical School, London, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Lean
authors.forename: K
authors.initials: K
authors.lastname: Matsuo
authors.forename: S W
authors.initials: SW
authors.lastname: Fox
authors.forename: K
authors.initials: K
authors.lastname: Fuller
authors.forename: F M
authors.initials: FM
authors.lastname: Gibson
authors.forename: G
authors.initials: G
authors.lastname: Draycott
authors.forename: M R
authors.initials: MR
authors.lastname: Wani
authors.forename: K E
authors.initials: KE
authors.lastname: Bayley
authors.forename: B R
authors.initials: BR
authors.lastname: Wong
authors.forename: Y
authors.initials: Y
authors.lastname: Choi
authors.forename: E F
authors.initials: EF
authors.lastname: Wagner
authors.forename: T J
authors.initials: TJ
authors.lastname: Chambers
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000166:cytology* / Q000502:physiology*; D002352:Carrier Proteins / Q000502:physiology*; D002454:Cell Differentiation / Q000502:physiology; D019070:Cell Lineage / Q000502:physiology*; D015870:Gene Expression; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D006801:Humans; D008297:Male; D008562:Membrane Glycoproteins / Q000502:physiology*; D051379:Mice; D010010:Osteoclasts / Q000166:cytology* / Q000502:physiology; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; D012190:Retroviridae
chemical_list: D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; C505686:TNFRSF11A protein, human; C505688:TNFSF11 protein, human; C505687:Tnfrsf11a protein, mouse; C505689:Tnfsf11 protein, mouse