title: Induction of suppressor T cells by intravenous administration of monoclonal anti-I-A antibody.
abstract: Intravenously administered monoclonal anti-I-A antibodies successfully induced suppressor T (Ts) cells specific for alloantigen-specific delayed-type hypersensitivity (DTH) responses in mice. These Ts cells exerted their effects in the effector phase and had no H-2 restrictions. Phenotypic analysis revealed L3T4 antigens on their cell surface but failed to reveal Lyt-2 antigen. Ts cell activity was abrogated by a 30-min incubation with the anti-I-A antibodies used for Ts cell induction. Incubation in the anti-I-A-antibody-coated plate also abrogated the Ts cell activity. Since anti-I-A antibody is idiotypic for the I-A antigen, it is suggested that these Ts cells might express antiidiotypic receptors for I-A antigens. These findings are considered to be consistent with previous observations of hapten-specific systems, in which antiidiotypic Ts cells are inducible by idiotypic antibodies.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000954:Antigens, Surface / Q000032:analysis; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006968:Hypersensitivity, Delayed / Q000276:immunology; D007108:Immune Tolerance; D007111:Immunity, Cellular; D007116:Immunization, Passive; D007130:Immunoglobulin Idiotypes / Q000276:immunology; D007275:Injections, Intravenous; D007518:Isoantibodies / Q000008:administration & dosage*; D051379:Mice; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D000949:Histocompatibility Antigens Class II; D007130:Immunoglobulin Idiotypes; D007518:Isoantibodies