title: Ox40 costimulation enhances the development of T cell responses induced by dendritic cells in vivo.
abstract: Dendritic cells (DCs) are bone marrow-derived APCs that display unique properties aimed at stimulating naive T cells. Several members of the TNF/TNFR families have been implicated in T cell functions. In this study, we examined the role that Ox40 costimulation might play on the ability of DCs to regulate CD4(+) and CD8(+) T cell responses in vivo. Administration of anti-mouse Ox40 mAb enhanced the Th response induced by immunization with Ag-pulsed DCs, and introduced a bias toward a Th1 immune response. However, anti-Ox40 treatment enhanced the production of Th2 cytokines in IFN-gamma(-/-) mice after immunization with Ag-pulsed DCs, suggesting that the production of IFN-gamma during the immune response could interfere with the development of Th2 lymphocytes induced by DCs. Coadministration of anti-Ox40 with DCs during Ag rechallenge enhanced both Th1 and Th2 responses induced during a primary immunization with DCs, and did not reverse an existing Th2 response. This suggests that Ox40 costimulation amplifies an ongoing immune response, regardless of Th differentiation potential. In an OVA-TCR class II-restricted adoptive transfer system, anti-Ox40 treatment greatly enhanced the level of cytokine secretion per Ag-specific CD4(+) T cell induced by immunization with DCs. In an OVA-TCR class I-restricted adoptive transfer system, administration of anti-Ox40 strongly enhanced expansion, IFN-gamma secretion, and cytotoxic activity of Ag-specific CD8(+) T cells induced by immunization with DCs. Thus, by enhancing immune responses induced by DCs in vivo, the Ox40 pathway might be a target for immune intervention in therapeutic settings that use DCs as Ag-delivery vehicles.
authors.affiliation: Discovery Research Department, Immunex Corporation, Seattle, WA 98101, USA. desmedtt@immunex.com
authors.forename: Thibaut
authors.initials: T
authors.lastname: De Smedt
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Smith
authors.forename: Peter
authors.initials: P
authors.lastname: Baum
authors.forename: William
authors.initials: W
authors.lastname: Fanslow
authors.forename: Eric
authors.initials: E
authors.lastname: Butz
authors.forename: Charles
authors.initials: C
authors.lastname: Maliszewski
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage; D019264:Adoptive Transfer; D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology; D002465:Cell Movement / Q000276:immunology; D016207:Cytokines / Q000096:biosynthesis; D003713:Dendritic Cells / Q000276:immunology / Q000637:transplantation*; D004655:Emulsions; D005260:Female; D006433:Hemocyanins / Q000008:administration & dosage; D007275:Injections, Intravenous; D007279:Injections, Subcutaneous; D007371:Interferon-gamma / Q000172:deficiency / Q000235:genetics; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology*; D018655:Lymphocyte Count; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D008822:Mice, Transgenic; D011948:Receptors, Antigen, T-Cell / Q000008:administration & dosage / Q000172:deficiency / Q000235:genetics; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism* / Q000637:transplantation; D018417:Th1 Cells / Q000276:immunology / Q000378:metabolism; D018418:Th2 Cells / Q000276:immunology / Q000378:metabolism; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7 / Q000276:immunology / Q000502:physiology*
chemical_list: D000276:Adjuvants, Immunologic; D000911:Antibodies, Monoclonal; D016207:Cytokines; D004655:Emulsions; D011948:Receptors, Antigen, T-Cell; D053262:Receptors, OX40; D018124:Receptors, Tumor Necrosis Factor; C505717:Tnfrsf4 protein, mouse; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D007371:Interferon-gamma; D006433:Hemocyanins; C032808:keyhole-limpet hemocyanin