title: B7.1 is a quantitatively stronger costimulus than B7.2 in the activation of naive CD8+ TCR-transgenic T cells.
abstract: Using a TCR transgenic mouse bred onto a recombinase-activating gene-2-deficient background, we have examined the influence of B7.1 and B7.2 on activation of naive, CD8+ T cells in vitro. We found that B7.1 was a more potent costimulus than B7.2 for induction of proliferation and IL-2 production by naive CD8+ T cells. This difference appeared to be quantitative in nature, as determined using transfectants expressing various defined levels of B7.1 or B7.2, or using purified B7.1 or B7.2 fusion proteins. In contrast to the quantitative differences seen in stimulation of naive T cells, B7.1 and B7.2 were comparable in their ability to costimulate responses in T cells previously primed in vitro. In addition, primed, but not naive, T cells were capable of proliferating and producing IL-2 in response to a TCR stimulus alone, apparently in the absence of B7 costimulation. Lastly, we found that B7.1 and B7.2 were equivalently capable of driving differentiation of naive CD8+ T cells into an IL-4-producing phenotype when exogenous IL-4 was added to the primary culture or to an IFN-gamma-producing phenotype in the presence of IL-12. These results indicate that signals generated by B7.1 and B7.2 are qualitatively similar, but that B7.1 is quantitatively stronger than B7.2. Further, our results indicate that the activation state of the responding T cell may influence the efficiency with which the T cell can respond to a costimulatory signal provided by either B7.1 or B7.2.
authors.affiliation: Department of Pathology, University of Chicago, IL 60637, USA.
authors.forename: P E
authors.initials: PE
authors.lastname: Fields
authors.forename: R J
authors.initials: RJ
authors.lastname: Finch
authors.forename: G S
authors.initials: GS
authors.lastname: Gray
authors.forename: R
authors.initials: R
authors.lastname: Zollner
authors.forename: J L
authors.initials: JL
authors.lastname: Thomas
authors.forename: K
authors.initials: K
authors.lastname: Sturmhoefel
authors.forename: K
authors.initials: K
authors.lastname: Lee
authors.forename: S
authors.initials: S
authors.lastname: Wolf
authors.forename: T F
authors.initials: TF
authors.lastname: Gajewski
authors.forename: F W
authors.initials: FW
authors.lastname: Fitch
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015703:Antigens, CD / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D018122:B7-1 Antigen / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D051940:B7-2 Antigen; D017252:CD3 Complex / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D018398:Homeodomain Proteins / Q000235:genetics; D006801:Humans; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology*; D012515:Mast-Cell Sarcoma; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D051379:Mice; D008817:Mice, Mutant Strains; D008822:Mice, Transgenic; D011948:Receptors, Antigen, T-Cell / Q000235:genetics*; D011993:Recombinant Fusion Proteins / Q000276:immunology / Q000494:pharmacology; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000378:metabolism; D014162:Transfection / Q000276:immunology; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D017252:CD3 Complex; C497964:CD86 protein, human; C497965:Cd86 protein, mouse; D018398:Homeodomain Proteins; D008562:Membrane Glycoproteins; D011948:Receptors, Antigen, T-Cell; D011993:Recombinant Fusion Proteins; C064658:RAG-1 protein