PMID- 15722361 OWN - NLM STAT- MEDLINE DCOM- 20050623 LR - 20220408 IS - 0021-9258 (Print) IS - 0021-9258 (Linking) VI - 280 IP - 16 DP - 2005 Apr 22 TI - MCP-1 is induced by receptor activator of nuclear factor-kappaB ligand, promotes human osteoclast fusion, and rescues granulocyte macrophage colony-stimulating factor suppression of osteoclast formation. PG - 16163-9 AB - Human osteoclast formation from monocyte precursors under the action of receptor activator of nuclear factor-kappaB ligand (RANKL) was suppressed by granulocyte macrophage colony-stimulating factor (GM-CSF), with down-regulation of critical osteoclast-related nuclear factors. GM-CSF in the presence of RANKL and macrophage colony-stimulating factor resulted in mononuclear cells that were negative for tartrate-resistant acid phosphatase (TRAP) and negative for bone resorption. CD1a, a dendritic cell marker, was expressed in GM-CSF, RANKL, and macrophage colony-stimulating factor-treated cells and absent in osteoclasts. Microarray showed that the CC chemokine, monocyte chemotactic protein 1 (MCP-1), was profoundly repressed by GM-CSF. Addition of MCP-1 reversed GM-CSF suppression of osteoclast formation, recovering the bone resorption phenotype. MCP-1 and chemokine RANTES (regulated on activation normal T cell expressed and secreted) permitted formation of TRAP-positive multinuclear cells in the absence of RANKL. However, these cells were negative for bone resorption. In the presence of RANKL, MCP-1 significantly increased the number of TRAP-positive multinuclear bone-resorbing osteoclasts (p = 0.008). When RANKL signaling through NFATc1 was blocked with cyclosporin A, both MCP-1 and RANTES expression was down-regulated. Furthermore, addition of MCP-1 and RANTES reversed the effects of cyclosporin A and recovered the TRAP-positive multinuclear cell phenotype. Our model suggests that RANKL-induced chemokines are involved in osteoclast differentiation at the stage of multinucleation of osteoclast precursors and provides a rationale for increased osteoclast activity in inflammatory conditions where chemokines are abundant. FAU - Kim, Michael S AU - Kim MS AD - School of Medical Science, Griffith University Gold Coast Campus, Queensland 4215, Australia. FAU - Day, Christopher J AU - Day CJ FAU - Morrison, Nigel A AU - Morrison NA LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20050217 PL - United States TA - J Biol Chem JT - The Journal of biological chemistry JID - 2985121R RN - 0 (CCL2 protein, human) RN - 0 (Carrier Proteins) RN - 0 (Chemokine CCL2) RN - 0 (DNA-Binding Proteins) RN - 0 (Membrane Glycoproteins) RN - 0 (NFATC Transcription Factors) RN - 0 (NFATC1 protein, human) RN - 0 (Nuclear Proteins) RN - 0 (RANK Ligand) RN - 0 (Receptor Activator of Nuclear Factor-kappa B) RN - 0 (TNFRSF11A protein, human) RN - 0 (TNFSF11 protein, human) RN - 0 (Transcription Factors) RN - 83869-56-1 (Granulocyte-Macrophage Colony-Stimulating Factor) SB - IM MH - Carrier Proteins/*metabolism MH - Cell Differentiation/physiology MH - Cell Fusion MH - Chemokine CCL2/*metabolism MH - DNA-Binding Proteins/metabolism MH - Gene Dosage MH - Granulocyte-Macrophage Colony-Stimulating Factor/*metabolism MH - Humans MH - Membrane Glycoproteins/*metabolism MH - Monocytes/cytology/metabolism MH - NFATC Transcription Factors MH - Nuclear Proteins/metabolism MH - Osteoclasts/cytology/*metabolism MH - RANK Ligand MH - Receptor Activator of Nuclear Factor-kappa B MH - Transcription Factors/metabolism EDAT- 2005/02/22 09:00 MHDA- 2005/06/24 09:00 CRDT- 2005/02/22 09:00 PHST- 2005/02/22 09:00 [pubmed] PHST- 2005/06/24 09:00 [medline] PHST- 2005/02/22 09:00 [entrez] AID - S0021-9258(20)69296-1 [pii] AID - 10.1074/jbc.M412713200 [doi] PST - ppublish SO - J Biol Chem. 2005 Apr 22;280(16):16163-9. doi: 10.1074/jbc.M412713200. Epub 2005 Feb 17.