title: Regulation of dendritic cell survival and cytokine production by osteoprotegerin.
abstract: The TNF family ligand, RANKL, and its two TNFR family receptors, RANK and OPG, enable coordinated regulation between the skeletal and immune systems. Relatively little is known about how OPG influences RANKL-RANK interactions for the regulation of DCs. Here, we show that OPG KO bone marrow-derived DCs survive better and produce more TNF-alpha, IL-12p40, and IL-23 in response to Escherichia coli LPS than WT DCs. RANKL is induced on DCs within 24 h after LPS stimulation. OPG limits RANKL-RANK interactions between DCs, which can promote DC survival and elevated expression of proinflammatory cytokines. Survival of and cytokine production by OPG KO DCs are inhibited by soluble OPG; conversely, anti-OPG enhances survival and cytokine production by WT DCs. Bim KO DCs, like OPG KO, also survive longer and produce more TNF-alpha than WT DCs; however, unlike OPG KO, Bim KO DCs do not produce more IL-23. In addition, after inoculation with LPS, OPG KO mice produce more TNF-alpha and IL-12p40 than WT mice but not more IL-6. Thus, OPG regulates not only DC survival but also the nature of DC-dependent inflammatory responses.
authors.affiliation: Department of Oral Biology, School of Dentistry, University of Washington, Seattle, WA 98195-7132, USA. tchino@washington.edu
authors.forename: Takahiro
authors.initials: T
authors.lastname: Chino
authors.forename: Kevin E
authors.initials: KE
authors.lastname: Draves
authors.forename: Edward A
authors.initials: EA
authors.lastname: Clark
mesh_terms: D000818:Animals; D051017:Apoptosis Regulatory Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D000072224:Bcl-2-Like Protein 11; D002470:Cell Survival / Q000502:physiology; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis* / Q000276:immunology; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008565:Membrane Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D053244:Osteoprotegerin / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D053245:RANK Ligand / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D053246:Receptor Activator of Nuclear Factor-kappa B / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D013997:Time Factors
chemical_list: D051017:Apoptosis Regulatory Proteins; D000072224:Bcl-2-Like Protein 11; C000606776:Bcl2l11 protein, mouse; D016207:Cytokines; D008070:Lipopolysaccharides; D008565:Membrane Proteins; D053244:Osteoprotegerin; D011518:Proto-Oncogene Proteins; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; C505687:Tnfrsf11a protein, mouse; C506031:Tnfrsf11b protein, mouse; C505689:Tnfsf11 protein, mouse