PMID: 11921181Mar 29, 2002Paper

Evidence for the presence of mutagenic arylamines in human breast milk and DNA adducts in exfoliated breast ductal epithelial cells

Environmental and Molecular Mutagenesis
Patricia A ThompsonChristine B Ambrosone

Abstract

Aromatic and heterocyclic amines are ubiquitous environmental mutagens present in combustion emissions, fried meats, and tobacco smoke, and are suspect human mammary carcinogens. To determine the presence of arylamines in breast tissue and fluid, we examined exfoliated breast ductal epithelial cells for DNA adducts and matched human milk samples for mutagenicity. Breast milk was obtained from 50 women who were 4-6 weeks postpartum, and exfoliated epithelial-cell DNA was evaluated for bulky, nonpolar DNA adducts by (32)P-postlabeling and thin-layer chromatography. Milk was processed by acid hydrolysis, and the extracted organics were examined in the standard plate-incorporation Ames Salmonella assay using primarily strain YG1024, which detects frameshift mutations and overexpresses aryl amine N-acetyltransferase. DNA adducts were identified in 66% of the specimens, and bulky adducts migrated in a pattern similar to that of 4-aminobiphenyl standards. The distribution of adducts did not vary by NAT2 genotype status. Of whole milk samples, 88% (22/25) had mutagenic activity. Among the samples for which we had both DNA adduct and mutagenicity data, 58% (14/19) of the samples with adducts were also mutagenic, and 85% (11/13) of the m...Continue Reading

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