title: Requirement for CD40 ligand in costimulation induction, T cell activation, and experimental allergic encephalomyelitis.
abstract: The mechanism of CD40 ligand (CD40L)-mediated in vivo activation of CD4(+) T cells was examined by investigation of the development of experimental allergic encephalomyelitis (EAE) in CD40L-deficient mice that carried a transgenic T cell receptor specific for myelin basic protein. These mice failed to develop EAE after priming with antigen, and CD4(+) T cells remained quiescent and produced no interferon-gamma (IFN-gamma). T cells were primed to make IFN-gamma and induce EAE by providing these mice with B7.1(+) antigen-presenting cells (APCs). Thus, CD40L is required to induce costimulatory activity on APCs for in vivo activation of CD4(+) T cells to produce IFN-gamma and to evoke autoimmunity.
authors.affiliation: Howard Hughes Medical Institute, and Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA.
authors.forename: I S
authors.initials: IS
authors.lastname: Grewal
authors.forename: H G
authors.initials: HG
authors.lastname: Foellmer
authors.forename: K D
authors.initials: KD
authors.lastname: Grewal
authors.forename: J
authors.initials: J
authors.lastname: Xu
authors.forename: F
authors.initials: F
authors.lastname: Hardardottir
authors.forename: J L
authors.initials: JL
authors.lastname: Baron
authors.forename: C A
authors.initials: CA
authors.lastname: Janeway
authors.forename: R A
authors.initials: RA
authors.lastname: Flavell
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology*; D015703:Antigens, CD / Q000096:biosynthesis; D018122:B7-1 Antigen / Q000096:biosynthesis / Q000276:immunology; D051940:B7-2 Antigen; D001921:Brain / Q000276:immunology / Q000473:pathology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D023201:CD40 Ligand; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology* / Q000473:pathology; D007371:Interferon-gamma / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000276:immunology*; D051379:Mice; D008822:Mice, Transgenic; D004676:Myelin Basic Protein / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D013116:Spinal Cord / Q000276:immunology / Q000473:pathology; D015854:Up-Regulation
chemical_list: D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; C497965:Cd86 protein, mouse; D008562:Membrane Glycoproteins; D004676:Myelin Basic Protein; D011948:Receptors, Antigen, T-Cell; D023201:CD40 Ligand; D015847:Interleukin-4; D007371:Interferon-gamma