title: Immunoregulation by T cells. I. Characterization of the IEk-specific Lbd self-reactive T cell clone that helps, suppresses and contrasupresses B cell responses.
abstract: This paper describes an L3T4+, Lyt-2- cloned T cell line of CBA/N origin that is specific for IEk-encoded products. Splenic dendritic cells are the predominant stimulatory populations for Lbd cells, being approximately 100 times more effective than large activated B cells. Small B cells and T cells are nonstimulatory. Lbd cells help large B cells to make polyclonal antibody responses, but are unable to activate small B cells and to replace antigen-specific helper T cells in T cell-dependent responses to phosphorylcholine or sheep red blood cells. In the presence of antigen-specific helper T cells, Lbd can amplify, suppress, or contrasuppress T cell function, depending on the type and relative ratios of antigen-reactive cells. We explain our findings as a consequence of the self reactivity among helper T cells.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000917:Antibody Formation; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology*; D002999:Clone Cells / Q000276:immunology; D006649:Histocompatibility Antigens / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007108:Immune Tolerance; D007156:Immunologic Memory; D008213:Lymphocyte Activation; D008285:Major Histocompatibility Complex; D051379:Mice; D008815:Mice, Inbred Strains; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000950:Antigens, Ly; D000954:Antigens, Surface; D006649:Histocompatibility Antigens; D000949:Histocompatibility Antigens Class II; C024138:I-E-antigen