title: A novel function of Valpha14+CD4+NKT cells: stimulation of IL-12 production by antigen-presenting cells in the innate immune system.
abstract: The balance between Th1 and Th2 development is determined by IL-4 and IL-12. While the role for CD4+ NK1.1+ T (NKT) cells in influencing this balance has been recognized based on their capacity to produce IL-4, it is unknown how IL-12 is produced in the innate immune system in which they participate. This study demonstrates that Ag-activated CD4+ NKT cells express CD40 ligand (CD40L) (CD154), which engages CD40 on APC and stimulates them to produce IL-12. Culture of B cell-depleted spleen cells from C57BL/6 mice with alpha-galactosylceramide (alpha-GalCer) capable of selectively stimulating Valpha14/Jalpha281+ NKT cells resulted in the production of IL-12 together with IFN-gamma and IL-4. alpha-GalCer-induced IL-12 production occurred in I-Abbeta-deficient mice, but not in beta2-microglobulin-deficient and Valpha14/Jalpha281 TCR-deficient mice, and was inhibited by anti-CD40L mAb. Of CD4+ and CD4- NKT cells, the capacity to express CD40L/CD154 and trigger IL-12 production following alpha-GalCer stimulation was exhibited preferentially by the CD4+ NKT subset. IL-12 production was also observed in alpha-GalCer-treated mice. Production of IL-12 preceded IFN-gamma production, and IL-12 was required for IFN-gamma, but not IL-4, production. A stimulatory/inhibitory relationship existed between IL-12 and IL-4 production. These results illustrate a novel function of CD4+ NKT cells that could be involved in the regulation of Th1 vs Th2 development.
authors.affiliation: Biomedical Research Center, Osaka University Medical School, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tomura
authors.forename: W G
authors.initials: WG
authors.lastname: Yu
authors.forename: H J
authors.initials: HJ
authors.lastname: Ahn
authors.forename: M
authors.initials: M
authors.lastname: Yamashita
authors.forename: Y F
authors.initials: YF
authors.lastname: Yang
authors.forename: S
authors.initials: S
authors.lastname: Ono
authors.forename: T
authors.initials: T
authors.lastname: Hamaoka
authors.forename: T
authors.initials: T
authors.lastname: Kawano
authors.forename: M
authors.initials: M
authors.lastname: Taniguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Koezuka
authors.forename: H
authors.initials: H
authors.lastname: Fujiwara
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology / Q000378:metabolism*; D001402:B-Lymphocytes; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D019013:CD40 Antigens / Q000096:biosynthesis; D023201:CD40 Ligand; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis; D005699:Galactosylceramides / Q000008:administration & dosage / Q000494:pharmacology; D007113:Immunity, Innate; D016130:Immunophenotyping; D007274:Injections, Intraperitoneal; D007371:Interferon-gamma / Q000096:biosynthesis; D018664:Interleukin-12 / Q000096:biosynthesis* / Q000502:physiology; D015847:Interleukin-4 / Q000096:biosynthesis / Q000502:physiology; D007694:Killer Cells, Natural / Q000276:immunology*; D008024:Ligands; D008213:Lymphocyte Activation / Q000187:drug effects; D008212:Lymphocyte Depletion; D008562:Membrane Glycoproteins / Q000096:biosynthesis; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000276:immunology*; D013154:Spleen / Q000166:cytology / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D019013:CD40 Antigens; D016207:Cytokines; D005699:Galactosylceramides; D008024:Ligands; D008562:Membrane Glycoproteins; D016693:Receptors, Antigen, T-Cell, alpha-beta; D023201:CD40 Ligand; D018664:Interleukin-12; D015847:Interleukin-4; D007371:Interferon-gamma