title: Role of L3T4 in antigen-driven activation of a class I-specific T cell hybridoma.
abstract: The expression of L3T4/Lyt-2 on murine T cells has led to the association of these surface markers with recognition of either class II or class I major histo-compatibility complex (MHC) antigens. It has been suggested that these T cell surface antigens interact with nonpolymorphic determinants on MHC antigens. We have examined the role of L3T4 in the recognition of H-2Dd by the T cell hybridoma, 3DT52.5. Mouse L cells transfected with either the H-2Dd gene, or with both the alpha and beta genes of I-Ak and the H-2Dd gene have been used to assess the role of an L3T4/la interaction at varying doses of H-2Dd. A role of L3T4 in activation of 3DT52.5 becomes evident only at limiting doses of antigen. It appears that an L3T4/la interaction can influence T cell function during suboptimal stimulation, implying that the L3T4/la interaction serves to raise the functional affinity of interaction between the T cell and the antigen-bearing cell.
mesh_terms: D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly / Q000276:immunology; D000954:Antigens, Surface / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000235:genetics / Q000276:immunology; D006825:Hybridomas / Q000276:immunology*; D007739:L Cells / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D014162:Transfection
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface; D000949:Histocompatibility Antigens Class II; D011948:Receptors, Antigen, T-Cell