title: Evaluation of Ia+ tumor cell lines and peritoneal exudate macrophages as accessory cells: differential requirements for the activation of certain T cell functions.
abstract: Several Ia+ (BC3A, TA3, D1B) or Ia-inducible (WEHI-3, P388D1) tumor lines were tested for accessory cell function for the activation of antigen-specific T cell proliferation and for the induction of T helper cells that help B cells in antibody production. All lines were able to induce antigen-specific T cell proliferation in an MHC-restricted way, but none activated T helper cells to soluble antigens under all conditions tested. In comparison, starch-induced peritoneal exudate macrophages induced T cell proliferation as well as T cell help. Some of the lines tested induced nonspecific suppressor cells that were Ly-2-positive and partially or completely inhibited antibody responses. The induction of suppressor cells, however, is not the reason for the failure of the tumor lines to activate T helper cells. These data indicate that antigen-specific T cell proliferation and helper activity do not necessarily correlate.
mesh_terms: D000818:Animals; D000961:Antilymphocyte Serum / Q000494:pharmacology; D002460:Cell Line; D002471:Cell Transformation, Neoplastic / Q000276:immunology; D003208:Concanavalin A / Q000494:pharmacology; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007108:Immune Tolerance; D008213:Lymphocyte Activation; D008211:Lymphocyte Cooperation; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D008805:Mice, Inbred A; D008807:Mice, Inbred BALB C; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000961:Antilymphocyte Serum; D000949:Histocompatibility Antigens Class II; D003208:Concanavalin A