title: Accessory cell function in a Con A response: role of Ia and interleukin 1.
abstract: Accessory cell (A-cell) function in a Con A response was analyzed. Irradiated P388D1 cells efficiently induced a proliferative response to Con A of T cells purified from spleen cells, whereas paraformaldehyde-fixed P388D1 cells failed to serve as A cells. Although IL-1 containing culture supernatant (SN) of a macrophage hybridoma induced the Con A response of the T-cell preparations, the depletion of Ia+ cells by the treatment with anti-Ia antibody and complement abrogated the response in the presence of IL-1. Fixed P388D1 cells and the hybridoma SN synergized in the reconstitution of the response. A 15,000-Da fraction of the hybridoma SN or human recombinant IL-1 alpha was able to substitute the hybridoma SN for the response. The reconstitution of the response by IL-1 and fixed P388D1 cells was inhibited by the addition of monoclonal anti-Ia antibody. These results indicate that IL-1 or fixed P388D1 cell does not exert a sufficient signal by itself and both of them are required for the reconstitution of a Con A response of highly purified T cells, and that Ia on fixed P388D1 cells play an important role.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000938:Antigen-Presenting Cells / Q000276:immunology*; D000950:Antigens, Ly / Q000276:immunology; D002460:Cell Line; D003208:Concanavalin A / Q000494:pharmacology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D007375:Interleukin-1 / Q000276:immunology*; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000950:Antigens, Ly; D000949:Histocompatibility Antigens Class II; D007375:Interleukin-1; D003208:Concanavalin A