title: Susceptibility of Ad12-transformed S (+) and S (-) mouse cells to cell-mediated immunity in vitro.
abstract: Adenovirus type 12 (Ad12)-transformed mouse cells were examined for their susceptibility to cell-mediated immunity in vitro, with respect to the activity of the virus-specific surface (S) antigen in the cells. A transformed cell line, C57AT1, was established from embryonic cells of C57BL/6 mice by Ad12 infection. In fluorescent antibody tests, the transformed cells were positive for the S antigen when the cells were maintained as cultures, whereas when the cells were grown as tumors in animals they became negative for the antigen (referred to as S(+) and S(-) cells, respectively). These S(+) and S(-) cells were subjected to the 51Cr-release test for cell lysis by immune spleen cells (ISC) raised in syngeneic mice by Ad12 infection. When the S(+) cells at various passage levels were exposed to ISC, all of them were lysed extensively and to a similar extent irrespective of their passage history. In contrast, the S(-) cells were consistently refractory to the action of ISC. In addition, the cytotoxic action of ISC was markedly impeded by pretreating the S(+) cells with antiserum to the S antigen, or the ISC with anti-Thy-1,2 serum plus complement. Taken these findings together, the S(+) cells were assumed to be injured by ISC through direct interaction of the S antigen with T-lymphocytes.
mesh_terms: D000256:Adenoviridae / Q000276:immunology*; D000818:Animals; D000954:Antigens, Surface / Q000276:immunology; D000956:Antigens, Viral / Q000276:immunology; D002472:Cell Transformation, Viral; D007111:Immunity, Cellular; D008297:Male; D051379:Mice; D009858:Oncogenic Viruses / Q000276:immunology; D013154:Spleen / Q000276:immunology; D014412:Tumor Virus Infections / Q000276:immunology*
chemical_list: D000954:Antigens, Surface; D000956:Antigens, Viral