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• W2009401108 abstract "Detection of micronuclei (MN) in skin cells from HRA/Skh hairless mice treated with chemical or physical agents may prove informative in qualitative and quantitative studies of skin carcinogenesis. MN induction and cell survival were estimated in cytokinesis-blocked keratinocytes, cultured for 4 days in vitro, after a single topical dose of various organic compounds. Treatment with 2.56 micrograms (10 nmol) 7,12-dimethylbenz[a] anthracene (DMBA) resulted in maximal MN induction in cells removed from skin 12-24 hr after topical administration (79-88 MN/1,000 cells compared with 10-16 MN/1,000 cells in acetone-treated controls). Even in cells removed only 1 hr after DMBA treatment, a significant increase in MN was evident. However, to allow sufficient time for metabolic activation, a sampling time for of 24 hr was adopted for all test substances. Dose-dependent increases in MN were observed with DMBA, benzo[a]pyrene, chrysene, and urethane. Increased numbers of micronucleated cells were detected at the lowest doses administered in the present study (0.128, 0.5, 50, and 50 micrograms, respectively). Although reduced cell recovery occurred following exposure of mice to acetone, pyrene, and other chemicals, there was no evidence that cytotoxicity contributed to MN scored in keratinocytes. Moreover, the probable noncarcinogen, pyrene, failed to induce MN at doses from 2.5 micrograms to 2.5 mg/mouse. These results show that it is possible to assess chemical exposure in skin by measuring cell survival and skin genotoxicity by measuring MN induction in cultured keratinocytes. The available data suggest that MN induction may be a useful indicator of the carcinogenic potential of chemicals applied to the skin." @default.
• W2009401108 created "2016-06-24" @default.
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• W2009401108 date "1991-01-01" @default.
• W2009401108 modified "2023-10-11" @default.
• W2009401108 title "Micronuclei in mouse skin cells following in vivo exposure to benzo[a]pyrene, 7,12-dimethylbenz[a]anthracene, chrysene, pyrene and urethane" @default.
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• W2009401108 doi "https://doi.org/10.1002/em.2850170305" @default.
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