The dioxin TCDD protects against aflatoxin-induced mutation in female rats, but not in male rats

2,3,7,8-Tetrachlorodibenzo- p-dioxin (TCDD) is an environmental contaminant and a potent carcinogen in laboratory rodents. When combined with other environmental toxins, it has been shown to increase the (geno)toxicity of some compounds. In this study, the effect of TCDD on the mutagenicity of aflat...

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Bibliographic Details
Published in:Mutation research. Genetic toxicology and environmental mutagenesis 2004-07, Vol.561 (1), p.147-152
Main Authors: Thornton, A.S., Oda, Y., Stuart, G.R., Holcroft, J., de Boer, J.G.
Format: Article
Language:English
Subjects:
Aflatoxin
Biological and medical sciences
Dioxin
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Medical sciences
Mixtures
Mutation
Mutation prevention
Rat
Toxicology
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Summary:2,3,7,8-Tetrachlorodibenzo- p-dioxin (TCDD) is an environmental contaminant and a potent carcinogen in laboratory rodents. When combined with other environmental toxins, it has been shown to increase the (geno)toxicity of some compounds. In this study, the effect of TCDD on the mutagenicity of aflatoxin-B 1 (AFB 1) was examined in the rat liver using a lacI transgenic rodent mutation assay. AFB 1 induces GC→TA transversions. Since TCDD is known to have a differential effect in male and female rodents, both sexes were studied. The data showed that a 6-week pre-exposure to TCDD had no significant effect on the frequency of aflatoxin-induced mutation in the liver of male rats. However, the TCDD treatment completely prevented the aflatoxin-induced transversion mutations in female animals.
ISSN:1383-5718
1879-3592
DOI:10.1016/j.mrgentox.2004.05.001