title: Simultaneous induction of CD4 T cell tolerance and CD8 T cell immunity by semimature dendritic cells.
abstract: Previous studies suggested that depending on their maturation state, dendritic cells (DC) could either induce T cell tolerance (immature and semimature DC) or T cell activation (mature DC). Pretreatment of C57BL/6 mice with encephalitogenic myelin oligodendrocyte glycoprotein (MOG)(35-55) peptide-loaded semimature DC protected from MOG-induced autoimmune encephalomyelitis. This protection was mediated by IL-10-producing CD4 T cells specific for the self Ag. Here we show that semimature DC loaded with the MHC class II-restricted nonself peptide Ag (OVA) induce an identical regulatory T cell cytokine pattern. However, semimature DC loaded simultaneously with MHC class II- and MHC class I-restricted peptides, could efficiently initiate CD8 T cell responses leading to autoimmune diabetes in a TCR-transgenic adoptive transfer model. Double-peptide-loaded semimature DC also induced simultaneously in the same animal partially activated CD8 T cells with cytolytic function as well as protection from MOG-induced autoimmune encephalomyelitis. Our study suggests that the decision between tolerance and immunity not only depends on the DC, but also on the type and activation requirements of the responding T cell.
authors.affiliation: Institute for Immunology, Ludwig-Maximilians-Universität München, Munich, Germany.
authors.forename: Petra
authors.initials: P
authors.lastname: Kleindienst
authors.forename: Carsten
authors.initials: C
authors.lastname: Wiethe
authors.forename: Manfred B
authors.initials: MB
authors.lastname: Lutz
authors.forename: Thomas
authors.initials: T
authors.lastname: Brocker
mesh_terms: D000818:Animals; D017951:Antigen Presentation; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D003713:Dendritic Cells / Q000276:immunology* / Q000502:physiology; D003921:Diabetes Mellitus, Experimental / Q000276:immunology; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology; D006023:Glycoproteins / Q000276:immunology; D007108:Immune Tolerance; D007111:Immunity, Cellular; D008213:Lymphocyte Activation / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D063308:Myelin-Oligodendrocyte Glycoprotein; D010047:Ovalbumin / Q000276:immunology; D010446:Peptide Fragments / Q000276:immunology
chemical_list: D006023:Glycoproteins; D063308:Myelin-Oligodendrocyte Glycoprotein; D010446:Peptide Fragments; C445081:myelin oligodendrocyte glycoprotein (35-55); D010047:Ovalbumin