title: Influence of various parameters on benzo(a)pyrene enhancement of adenovirus SA7 transformation of Syrian hamster embryo cells.
abstract: Several of the major variable factors in the Syrian hamster embryo/simian adenovirus SA7 (SHE/SA7) viral enhancement assay were identified and the effects of these parameters on assay sensitivity were assessed. The extent of dose-dependent cytotoxicity and enhancement of SA7 transformation of primary SHE target cells by benzo(a)pyrene was examined through analysis of data obtained from 37 assays performed over a 2-year period. The variables analyzed for contribution to assay sensitivity included the number of SA7-induced transformed SHE cell foci enumerated in ten replicate dishes in the negative control condition (background focus count) (range: 26-139); the age of the SHE cell cultures at the time of exposure to benzo(a)pyrene (range: 72-144 hr postseeding); and the source of the pregnant hamsters used to prepare the primary SHE cells (Wilmington colony vs Lakeview colony, Charles River Laboratories, Inc., Wilmington, MA). The benzo(a)pyrene-induced cytotoxicity and enhancement of SA7 transformation responses were found to be independent of each of these variables, within the range of values tested.
mesh_terms: D000256:Adenoviridae / Q000472:pathogenicity*; D000261:Adenoviruses, Simian / Q000472:pathogenicity*; D000818:Animals; D001564:Benzo(a)pyrene / Q000633:toxicity*; D002471:Cell Transformation, Neoplastic / Q000187:drug effects*; D002472:Cell Transformation, Viral / Q000187:drug effects*; D002478:Cells, Cultured; D003043:Cocarcinogenesis; D006224:Cricetinae; D004622:Embryo, Mammalian; D005260:Female; D008647:Mesocricetus
chemical_list: D001564:Benzo(a)pyrene