Susceptibility of Friend virus antigen-modulated erythroleukemic cells to lysis by T lymphocytes from mice with dormant Friend virus infections.
Spleen cells from DBA/2 mice with dormant Friend leukemia virus (FLV) infections or from mice immunized with x-irradiated FLC-745 erythroleukemic cells are not cytolytic for FLC-745 cells when tested directly, but acquire cytolytic activity in vitro by cultivation with x-irradiated FLC-745 cells. Spleen cells cultured from normal mice do not acquire such cytolytic activity. Cytolytic activity resides in the T lymphocyte population. Alloantiserum, but not antisera against FLV-virion polypeptides, inhibited the lysis of FLC-745 cells by cytolytic T lymphocytes. To understand further the role of cellular and humoral immune anti-FLV responses in mice with dormant FLV-infections, in vitro experiments were conducted that mimicked the in vivo FLV-specific immune environment of these mice. We found that FLV-immune serum from mice with dormant FLV-infections modulated FLV-antigen expression on the surfaces of FLC-745 cells without affecting their susceptibility to lysis by cytolytic T lymphocytes. These results suggest that cytolytic T lymphocyte restrain the outgrowth of FLV-antigen-modulated erythroleukemic cells in mice with dormant FLV infections and that the targets for cell-mediated lysis may be H-2d-associated antigens.
D000818:Animals; D000937:Antigen-Antibody Reactions; D000956:Antigens, Viral; D003602:Cytotoxicity, Immunologic; D005622:Friend murine leukemia virus / Q000276:immunology; D006649:Histocompatibility Antigens / Q000276:immunology; D004915:Leukemia, Erythroblastic, Acute / Q000276:immunology*; D007942:Leukemia, Experimental / Q000276:immunology*; D051379:Mice; D008811:Mice, Inbred DBA; D013601:T-Lymphocytes / Q000276:immunology*
D000956:Antigens, Viral; D006649:Histocompatibility Antigens