title: Differential induction of tumour antigens by transformation-defective virus mutants.
abstract: Normal rat kidney cells infected by a variety of transformation-defective temperature-sensitive avian leukosis sarcoma virus mutants were tested for the expression of transformation characteristics at permissive and restrictive temperature. Morphology, growth behaviour and agglutinability by concanavalin A corresponded fully to the phenotype of the infected cells: at permissive temperature the cells resembled wild type virus transformed cells, whereas when grown under restrictive conditions they became virtually indistinguishable from normal cells. The quantitative expression of allo- or xenogeneic cell surface antigens was not significantly affected by the phenotype of the cells. Two out of the five tested mutants induced tumour antigens in the expected temperature-dependent manner, whereas the other three mutants were able to induce tumour-specific cell surface antigens even in the revertant cells cultured at the restrictive temperature. These findings extend previous results about tumour antigen induction in mutant-infected cells of the natural host, the chicken embryo fibroblasts. The value of transformation-defective tumour antigen-positive mutants for vaccination purposes will be discussed.
mesh_terms: D001355:Alpharetrovirus / Q000254:growth & development*; D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis; D002455:Cell Division; D002460:Cell Line; D002462:Cell Membrane / Q000276:immunology; D002471:Cell Transformation, Neoplastic; D009154:Mutation; D010641:Phenotype; D051381:Rats; D013696:Temperature
chemical_list: D000951:Antigens, Neoplasm