title: Induction of tolerance by IL-10-treated dendritic cells.
abstract: Dendritic cells (DC) form a specialized system for presenting Ag to naive or quiescent T cells and consequently play a central role in the induction of T and B cell immunity. In this study we used DC generated from peripheral progenitors to analyze the effect of IL-10 on the accessory function of human DC. We demonstrate that immature DC, harvested on days 9 to 11 and exposed to IL-10 for the last 2 days of culture, show a strongly reduced capacity to stimulate a CD4+ T cell response in an allogeneic MLR in a dose-dependent manner. In contrast, fully mature DC are completely resistant to the effects of IL-10. These results were obtained in both an alloantigen-induced MLR and an anti-CD3 mAb-induced response of primed and naive (CD45RA+) CD4+ T cells. FACS analysis revealed inhibition of the up-regulation of the costimulatory molecules CD58 and CD86 and the specific DC marker CD83 in DC pretreated with IL-10. These data suggest that IL-10 inhibited the development of fully mature DC. Furthermore, DC precultured with IL-10, but not controls, induced a state of alloantigen-specific anergy in CD4+ T cells and of peptide-specific anergy in the influenza hemagglutinin-specific T cell clone HA1.7. Analysis of the supernatants of these anergic T cells revealed a reduced production of IL-2 and IFN-gamma compared with that in control cells. Collectively, these data suggest that IL-10 converts immature DC into tolerogenic APC, which might be a useful tool in the therapy of patients with autoimmune or allergic diseases.
authors.affiliation: Department of Dermatology, University of Mainz, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Steinbrink
authors.forename: M
authors.initials: M
authors.lastname: Wölfl
authors.forename: H
authors.initials: H
authors.lastname: Jonuleit
authors.forename: J
authors.initials: J
authors.lastname: Knop
authors.forename: A H
authors.initials: AH
authors.lastname: Enk
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology; D017951:Antigen Presentation / Q000187:drug effects; D017252:CD3 Complex / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology; D002478:Cells, Cultured; D017635:Clonal Anergy / Q000187:drug effects; D002999:Clone Cells; D003713:Dendritic Cells / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D004306:Dose-Response Relationship, Immunologic; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D006131:Growth Inhibitors / Q000494:pharmacology; D006684:HLA-DR Antigens / Q000096:biosynthesis; D006801:Humans; D007108:Immune Tolerance / Q000187:drug effects*; D007166:Immunosuppressive Agents / Q000494:pharmacology; D016753:Interleukin-10 / Q000494:pharmacology* / Q000502:physiology; D007519:Isoantigens / Q000276:immunology; D017493:Leukocyte Common Antigens / Q000032:analysis; D008213:Lymphocyte Activation / Q000187:drug effects; D015854:Up-Regulation / Q000187:drug effects / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D017252:CD3 Complex; D018984:Epitopes, T-Lymphocyte; D006131:Growth Inhibitors; D006684:HLA-DR Antigens; D007166:Immunosuppressive Agents; D007519:Isoantigens; D016753:Interleukin-10; D017493:Leukocyte Common Antigens