title: High IFN-gamma production of individual CD8 T lymphocytes is controlled by CD152 (CTLA-4).
abstract: CD8 T cell expansion and cytokine production is needed to generate an effective defense against viral invasion of the host. These features of CD8 T lymphocytes are regulated, especially during primary responses, by positive and negative costimulation. We show in this study that surface expression of CD152 is highly up-regulated on activated CD8 T lymphocytes during primary immune responses, suggesting a prominent regulatory role. Indeed, production of the proinflammatory cytokine IFN-gamma, but not TNF-alpha, by CD8 T cells was inhibited by CD152 engagement. The inhibition was regulated independent of proliferation and IL-2 production, but dependent on the quality of the TCR signaling. We show that signals induced by CD152 on activated CD8 T lymphocytes reduce the frequency of IFN-gamma(high)-expressing cells. Our data also show that in activated CD8 T cells, the CD152-mediated inhibition of cytokine production is more pronounced than inhibition of their proliferation.
authors.affiliation: Charité-Universitätsmedizin Berlin, Deutsches Rheumaforschungszentrum, Berlin, Germany.
authors.forename: Pushpa
authors.initials: P
authors.lastname: Pandiyan
authors.forename: J Kolja E
authors.initials: JK
authors.lastname: Hegel
authors.forename: Manuela
authors.initials: M
authors.lastname: Krueger
authors.forename: Dagmar
authors.initials: D
authors.lastname: Quandt
authors.forename: Monika C
authors.initials: MC
authors.lastname: Brunner-Weinzierl
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D000943:Antigens, Differentiation / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D060908:CTLA-4 Antigen; D049109:Cell Proliferation; D007249:Inflammation / Q000276:immunology / Q000378:metabolism; D007371:Interferon-gamma / Q000096:biosynthesis / Q000276:immunology*; D007376:Interleukin-2 / Q000096:biosynthesis / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D018345:Mice, Knockout; D015398:Signal Transduction / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis / Q000276:immunology; D015854:Up-Regulation / Q000276:immunology*
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D060908:CTLA-4 Antigen; C556707:Ctla4 protein, mouse; D007376:Interleukin-2; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma