title: OX40 ligand expressed by DCs costimulates NKT and CD4+ Th cell antitumor immunity in mice.
abstract: The exceptional immunostimulatory capacity of DCs makes them potential targets for investigation of cancer immunotherapeutics. We show here in mice that TNF-alpha-stimulated DC maturation was accompanied by increased expression of OX40 ligand (OX40L), the lack of which resulted in an inability of mature DCs to generate cellular antitumor immunity. Furthermore, intratumoral administration of DCs modified to express OX40L suppressed tumor growth through the generation of tumor-specific cytolytic T cell responses, which were mediated by CD4+ T cells and NKT cells. In the tumors treated with OX40L-expressing DCs, the NKT cell population significantly increased and exhibited a substantial level of IFN-gamma production essential for antitumor immunity. Additional studies evaluating NKT cell activation status, in terms of IFN-gamma production and CD69 expression, indicated that NKT cell activation by DCs presenting alpha-galactosylceramide in the context of CD1d was potentiated by OX40 expression on NKT cells. These results show a critical role for OX40L on DCs, via binding to OX40 on NKT cells and CD4+ T cells, in the induction of antitumor immunity in tumor-bearing mice.
authors.affiliation: Department of Respiratory Oncology and Molecular Medicine, Institute of Development, Aging and Cancer, Graduate School of Medicine, Faculty of Medicine, Tohoku University, Sendai, Japan.
authors.forename: Jamal
authors.initials: J
authors.lastname: Zaini
authors.forename: Sita
authors.initials: S
authors.lastname: Andarini
authors.forename: Minoru
authors.initials: M
authors.lastname: Tahara
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Saijo
authors.forename: Naoto
authors.initials: N
authors.lastname: Ishii
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Kawakami
authors.forename: Masaru
authors.initials: M
authors.lastname: Taniguchi
authors.forename: Kazuo
authors.initials: K
authors.lastname: Sugamura
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Nukiwa
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Kikuchi
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002460:Cell Line; D003602:Cytotoxicity, Immunologic / Q000502:physiology; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology*; D005260:Female; D007111:Immunity, Cellular / Q000502:physiology*; D007371:Interferon-gamma / Q000276:immunology; D007694:Killer Cells, Natural / Q000166:cytology / Q000276:immunology*; D008213:Lymphocyte Activation; D016131:Lymphocyte Subsets; D008562:Membrane Glycoproteins / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009374:Neoplasms, Experimental / Q000276:immunology; D053278:OX40 Ligand; D053262:Receptors, OX40 / Q000235:genetics / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology; D048069:Tumor Necrosis Factors / Q000235:genetics / Q000276:immunology*
chemical_list: D008562:Membrane Glycoproteins; D053278:OX40 Ligand; D053262:Receptors, OX40; C505717:Tnfrsf4 protein, mouse; C504586:Tnfsf4 protein, mouse; D014409:Tumor Necrosis Factor-alpha; D048069:Tumor Necrosis Factors; D007371:Interferon-gamma