title: Accessory cell function of a lined macrophage in the induction of suppressor T cells in vitro.
abstract: Antigen-specific Ts against DTH to BCG were induced in vitro by culturing the splenic T cells of C3H/He mice together with the lined macrophage, SL-1, pulsed with PPD. The suppressor activity was determined by the suppression of DTH in CY-treated syngeneic recipients which had received the cultured cells before BCG sensitization. SL-1 cells express I-A and I-J antigens on the surface, while SL-4 cells, which originated in the same mouse strain as SL-1, do not express any Ia antigens. When I-A antigens on SL-1 were blocked by anti-I-A antibody without complement before PPD-pulsing, the induction of Ts was rather enhanced. When I-J antigens on SL-1 were blocked by anti-I-J alloantiserum, no Ts were induced. Instead, these I-J-blocked and PPD-pulsed SL-1 cells induced effector cells of DTH in vitro. Ia-negative lined macrophage SL-4 cells did not show any activity either in suppressor or in effector cell induction. From these results, we propose a model for the immune modulation led by APC.
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000502:physiology*; D002478:Cells, Cultured; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D006968:Hypersensitivity, Delayed / Q000276:immunology; D008213:Lymphocyte Activation; D008264:Macrophages / Q000502:physiology*; D051379:Mice; D008809:Mice, Inbred C3H; D009163:Mycobacterium bovis / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000502:physiology*; D014373:Tuberculin / Q000276:immunology
chemical_list: D000949:Histocompatibility Antigens Class II; D014373:Tuberculin