title: Lineage-specific requirement for signal transducer and activator of transcription (Stat)4 in interferon gamma production from CD4(+) versus CD8(+) T cells.
abstract: CD4(+) and CD8(+) T cells exhibit important differences in their major effector functions. CD8(+) T cells provide protection against pathogens through cytolytic activity, whereas CD4(+) T cells exert important regulatory activity through production of cytokines. However, both lineages can produce interferon (IFN)-gamma, which can contribute to protective immunity. Here we show that CD4(+) and CD8(+) T cells differ in their regulation of IFN-gamma production. Both lineages require signal transducer and activator of transcription (Stat)4 activation for IFN-gamma induced by interleukin (IL)-12/IL-18 signaling, but only CD4(+) T cells require Stat4 for IFN-gamma induction via the TCR pathway. In response to antigen, CD8(+) T cells can produce IFN-gamma independently of IL-12, whereas CD4(+) T cells require IL-12 and Stat4 activation. Thus, there is a lineage-specific requirement for Stat4 activation in antigen-induced IFN-gamma production based on differences in TCR signaling between CD4(+) and CD8(+) T cells.
authors: Department of Pathology and Center for Immunology, Howard Hughes Medical Institute, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
authors: L L
authors: LL
authors: Carter
authors: K M
authors: KM
authors: Murphy
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D004268:DNA-Binding Proteins / Q000276:immunology*; D005434:Flow Cytometry; D007371:Interferon-gamma / Q000378:metabolism*; D018664:Interleukin-12 / Q000378:metabolism; D020382:Interleukin-18 / Q000378:metabolism; D051379:Mice; D008822:Mice, Transgenic; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D050797:STAT4 Transcription Factor; D015398:Signal Transduction / Q000276:immunology; D015534:Trans-Activators / Q000276:immunology*
chemical_list: D004268:DNA-Binding Proteins; D020382:Interleukin-18; D011948:Receptors, Antigen, T-Cell; D050797:STAT4 Transcription Factor; C494091:Stat4 protein, mouse; D015534:Trans-Activators; D018664:Interleukin-12; D007371:Interferon-gamma