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• W1968430039 endingPage "57" @default.
• W1968430039 startingPage "49" @default.
• W1968430039 abstract "Benzene is a widely used chemical and common environmental contaminant. It is carcinogenic in man and animals and is genotoxic in mice, rats, and occupationally exposed humans at doses above one part per million. In order to evaluate the genotoxic effects of prolonged exposures to very low concentrations of benzene, we exposed CD-1 mice to benzene by inhalation for 22 h per day, seven days per week for six weeks at 40, 100 and 1000 parts per billion (ppb). Additional groups were exposed to purified air or were housed in standard plastic cages. The effects of in vivo exposure to benzene were evaluated by using an autoradiogaaphic assay to determine the frequency of mutants which represent mutations at the hypoxanthine-guanine phosphoribosyl transferase (hprt) locus in spleen lymphocytes. At the end of the six weeks exposure period lymphocytes were recoverd from the spleens of the mice and cryopreserved prior to assay. Mutant cells were selected on the basis of their ability to incorporate tritiated thymidine in the presence of 6-thioguanine. The weighted mean variant (mutant) frequencies (Vf) of female mice (three per group) were 7.2 × 10−6 at 0 ppb; 29.2 × 10−6 at 40 ppb; 62.5 × 10−6 at 100 ppb and 25.0 × 10−6 at 1000 ppb. The Vf of unexposed mice housed in standard cages was 13.2 × 10−6. In male mice the same pattern of response was observed, but the increases in Vf in response to benzene were not as great. In both sexes of mice, the increases at 40 and 100 ppb were significantly greater than at 0 ppb (P < 0.05). The increase in Vf with exposure to 100 ppb and the decline at 1000 ppb parallel the results observed for chromosome damage in spleen lymphocytes from the same animals (Au et al., Mutation Res. 260 (1991) 219–224). These results indicate that sub-chronic exposure to benzene at levels below the current Occupational Safety and Health Administration Permitted Exposure Limit may induce gene mutations in lymphocytes in mice." @default.
• W1968430039 created "2016-06-24" @default.
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• W1968430039 date "1992-07-01" @default.
• W1968430039 modified "2023-10-09" @default.
• W1968430039 title "The mutagenic effects of low level sub-acute inhalation exposure to benzene in CD-1 mice" @default.
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• W1968430039 doi "https://doi.org/10.1016/0027-5107(92)90082-d" @default.
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