title: Differential effect of IL-10 on dendritic cell-induced T cell proliferation and IFN-gamma production.
abstract: IL-10 has previously been shown to inhibit cytokine production by Th1 cells by blocking macrophage accessory cell function. In this study we demonstrate that dendritic cell-induced Th1 proliferation was unaffected by IL-10, whereas macrophage-stimulated proliferation was inhibited in the same system. In contrast dendritic cell induced IFN-gamma production by the Th1 clones was down-regulated by IL-10. Inasmuch as dendritic cells have been shown to be potent APC for T cells in primary responses we determined the effect of IL-10 on dendritic cell-induced proliferation and IFN-gamma production by CD4+ and CD8+ T cells. Dendritic cells were effective at stimulating both proliferation and IFN-gamma secretion of CD4+ or CD8+ T cells in a primary allogeneic mixed leukocyte response. In contrast, IL-10 markedly inhibited dendritic cell driven IFN-gamma production by purified CD4+ and CD8+ T cells. Down-regulation of dendritic cell-induced IFN-gamma production suggests a role for IL-10 in inhibiting the initiation of cell-mediated immune responses.
authors.affiliation: DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94303.
authors.forename: S E
authors.initials: SE
authors.lastname: Macatonia
authors.forename: T M
authors.initials: TM
authors.lastname: Doherty
authors.forename: S C
authors.initials: SC
authors.lastname: Knight
authors.forename: A
authors.initials: A
authors.lastname: O'Garra
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D003713:Dendritic Cells / Q000187:drug effects* / Q000502:physiology; D005260:Female; D007371:Interferon-gamma / Q000096:biosynthesis*; D016753:Interleukin-10 / Q000494:pharmacology*; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008264:Macrophages / Q000187:drug effects / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D008808:Mice, Inbred CBA; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism
chemical_list: D007376:Interleukin-2; D016753:Interleukin-10; D007371:Interferon-gamma