title: Expression of SV40 tumor antigen in SV40 transformed teratocarcinoma-derived cell lines.
abstract: The relative importance of viral tumor antigen expression and the cellular background in the maintenance of a transformation phenotype was examined in five SV40-transformed teratocarcinoma-derived cell lines. These cell lines show qualitative differences in growth characteristics associated with transformation, and vary in their state of differentiation. Viral T antigen expression was evaluated by two criteria: 1) the amount of immunoprecipitated antigen in growing cells, and 2) the amount and rate of antigen synthesis in density-inhibited cells. There was no direct correlation found between retention, or rate of synthesis, of the viral T antigen and the degree of transformation. These findings imply that the cellular environment has a more important influence on the growth properties of a stably transformed cell than the quantitative levels of viral T antigen expression.
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis*; D000956:Antigens, Viral / Q000032:analysis*; D002452:Cell Count; D002455:Cell Division; D002460:Cell Line; D002472:Cell Transformation, Viral; D003260:Contact Inhibition; D051379:Mice; D013539:Simian virus 40 / Q000276:immunology*; D013724:Teratoma
chemical_list: D000951:Antigens, Neoplasm; D000956:Antigens, Viral