title: Cellular requirements for antigen presentation in the induction of a thymus-independent antibody response in vitro.
abstract: The ability of various cell populations to bind and present the thymus-independent antigen TNP-Ficoll to a responding cell population was assessed. The in vitro antibody response to TNP-Ficoll depends upon the presence of B lymphocytes and plastic-adherent accessory cells, but does not require T lymphocytes. Purified B cells were the most effective population in binding and presenting TNP-Ficoll, and adherent cells did not perform this function. Antigen binding and presentation was antigen specific and could be blocked with anti-mu antibody, but not by antibodies directed against other immunoglobulin classes. Spleen cells from mice genetically unresponsive to TNP-Ficoll (CBA/N X BALB/c F1 males) were equally effective as normal spleen cells in antigen binding and presentation. We conclude that the initial events in the induction of the antibody response involves antigen binding by B cells, and that subsequent activation of the subset of B cells that can respond to TNP-Ficoll proceeds either via B cell-B cell interaction or B cell-dependent transfer of antigen to macrophage-like cells.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000941:Antigens; D001402:B-Lymphocytes / Q000276:immunology; D002448:Cell Adhesion; D002470:Cell Survival; D005260:Female; D005362:Ficoll / Q000276:immunology; D007111:Immunity, Cellular; D007075:Immunoglobulin M; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008811:Mice, Inbred DBA; D011817:Rabbits; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology*; D014301:Trinitrobenzenes / Q000276:immunology
chemical_list: D000941:Antigens; D007075:Immunoglobulin M; D014301:Trinitrobenzenes; D005362:Ficoll