Three chlorinated ethane and ethylene solvent products were examined for their genotoxicity in the Salmonella/microsome mutagenesis and hepatocyte primary culture DNA repair assays using vapor phase exposures. The positive control in this study, monochloroethylene (vinyl chloride), induced reversion mutation of Salmonella tester strains TA100 and TA1535 with enhancement by an exogenous activation system and elicited unscheduled DNA synthesis in rat hepatocytes in culture. Exposures to 1,1,1-trichloroethane (methyl chloroform) or 1,1,2-trichloroethylene samples which contained stabilizers resulted in increased recovery of revertant colonies of Salmonella at concentrations causing greater than 96% cell killing. However, these stabilized materials did not induce DNA repair and low-stabilized trichloroethylene did not induce reversion mutation or DNA repair. Exposure of Salmonella tester strains and hepatocytes to highly toxic vapor concentrations of technical grade 1,1,2,2-tetrochloroethylene, low-stabilized and stabilized, increased reversion mutation and elicited DNA repair. Tetrachloroethylene of high purity was not genotoxic. With all of these test products, the presence of an Aroclor-induced rat liver subcellular enzyme preparation in the mutagenesis assay did not have any effect on the results. These observations suggest that stabilizers or unknown impurities normally present at low concentrations in these products are responsible for the positive responses observed at the high exposure concentrations achievable under in vitro test conditions.
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Abbreviations
- HPC:
-
hepatocyte primary culture
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Shimada, T., Swanson, A.F., Leber, P. et al. Activities of chlorinated ethane and ethylene compounds in the Salmonella/rat microsome mutagenesis and rat hepatocyte/DNA repair assays under vapor phase exposure conditions. Cell Biol Toxicol 1, 159–179 (1985). https://doi.org/10.1007/BF00120162
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DOI: https://doi.org/10.1007/BF00120162