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• W1540572733 abstract "Pretreatment of a cloned rat embryo fibroblast cell line (CREF) with methyl methanesulfonate (MMS) prior to infection with a specific cold-sensitive type 5 adenovirus mutant, H5hr1, results in a unique carcinogen enhancement of transformation phenotype. MMS induces a dose-dependent increase in the absolute number of transformed foci in comparison with solvent-treated controls as well as an increase in transformation frequency when normalized for carcinogen-induced cell toxicity. To determine if the carcinogen enhancement of transformation phenotype was a consequence of the carcinogen altering the pattern of type 5 adenovirus (Ad5) DNA integration into the genome of CREF cells and/or if carcinogen treatment modified the phenotype of established H5hr1-transformed CREF cells, we have analyzed a series of single cell-derived H5hr1-transformed CREF cultures which were isolated from cultures pretreated with carcinogen-solvent or MMS prior to infection with H5hr1. Analysis of viral DNA integration by DNA filter-transfer hybridization (Southern blotting) indicated that MMS pretreatment did not increase the copy number of Ad5 DNA sequences which persisted in H5hr1-transformed clones or result in transformants which contained identical DNA restriction enzyme cleavage patterns. MMS-pretreated H5hr1-transformed clones also did not differ significantly from solvent-pretreated H5hr1-transformed clones in their ability to grow in agar, bind 125I-epidermal growth factor, or form tumors in athymic nude mice. MMS-pretreated H5hr1-transformed CREF clones retained a similar cold-sensitive negative regulation in the expression of the transformed cell phenotype as did H5hr1-transformed clones not exposed to carcinogens. These findings suggest that the unique carcinogen enhancement of transformation phenotype displayed by CREF cells pretreated with MMS prior to infection with H5hr1 does not result in transformants which either contain increased concentrations of Ad5 DNA or similar patterns of Ad5 DNA integration. Furthermore, carcinogen-pretreated H5hr1 transformants did not display novel phenotypes not expressed by cloned H5hr1-transformed CREF cell lines exposed to solvent prior to viral infection." @default.
• W1540572733 created "2016-06-24" @default.
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• W1540572733 date "1988-06-01" @default.
• W1540572733 modified "2023-09-23" @default.
• W1540572733 title "Effect of methyl methanesulfonate on type 5 adenovirus DNA integration and the phenotypic properties of cold-sensitive type 5 adenovirus-transformed cloned rat embryo fibroblast cells." @default.
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