title: Macrophage T cell interaction in man: binding of antigen-specific human proliferating and helper T cells to antigen-pulsed macrophages.
abstract: Adsorption of T cells over monolayers of autologous, but not allogeneic, macrophages (M phi) pulsed with tetanus toxoid (TT) antigen resulted in the specific depletion of the capacity of the T cells to proliferate and to release T cell helper factor in response to stimulation, with TT antigen. T cells that bound to the TT-pulsed M phi monolayers were specifically enriched in their capacity to proliferate in response to TT. Turkey antiserum to the human B cell glycoprotein p 29,34, but not turkey antiserum to human beta 2 microglobulin, inhibited the binding of TT-reactive T cells to TT-pulsed M phi. This inhibition resulted from the binding of the anti-p 29,34 antiserum to DR determinants expressed on the surface of the M phi. Immunosorbent purified IgG anti-TT, added in great excess, did not inhibit the binding of TT-reactive T cells to TT-pulsed M phi monolayers. Soluble TT antigen and rabbit antiidiotypic IgG, directed against IgG F(ab')2 anti-TT obtained from the cell donor, minimally inhibited the binding of TT-reactive T cells to TT pulsed M phi monolayers. M phi pulsed with urea-denatured TT, which contained less than 1% native TT, depleted T cell reactivity to TT to an extent almost equivalent to that achieved by M phi pulsed with native TT. These results indicate that human antigen-reactive T cells bind to the DR determinants of M phi pulsed with antigen and that the immunogenic moiety of antigen recognized by the majority of antigen reactive human T cells may differ from native antigen.
mesh_terms: D000327:Adsorption; D000941:Antigens; D001665:Binding Sites; D002450:Cell Communication; D002455:Cell Division; D000939:Epitopes; D006801:Humans; D007106:Immune Sera / Q000494:pharmacology; D007074:Immunoglobulin G; D007130:Immunoglobulin Idiotypes; D007164:Immunosorbents; D008264:Macrophages / Q000276:immunology*; D013299:Streptodornase and Streptokinase / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013745:Tetanus Toxoid / Q000276:immunology; D014508:Urea / Q000494:pharmacology
chemical_list: D000941:Antigens; D000939:Epitopes; D007106:Immune Sera; D007074:Immunoglobulin G; D007130:Immunoglobulin Idiotypes; D007164:Immunosorbents; D013745:Tetanus Toxoid; D014508:Urea; D013299:Streptodornase and Streptokinase