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- W2000208636 abstract "Nephrotoxic aristolochic acids (AAs) form covalently bonded DNA adducts upon metabolic activation. In this work, a non-invasive approach to detect AAs exposure by quantifying urinary excreted DNA-AA adducts is presented. The developed method entails solid-phase extraction (SPE) enrichment of the urine-excreted DNA-AAs adducts, addition of internal standard, and quantification by liquid chromatography coupled tandem mass spectrometric (LC–MS/MS) analysis. Quantitative analysis revealed 7-(deoxyadenosine-N6-yl)-aristolactam II and 7-(deoxyguanosine-N2-yl)-aristolactam I that were previously detected as major DNA-AA adducts in different organs of AA-dosed rats, were detected as the major urine excreted adducts. Lower levels of 7-(deoxyadenosine-N6-yl)-aristolactam I and 7-(deoxyguanosine-N2-yl)-aristolactam II were also detected in the collected urine samples. The identities of the detected urinary DNA-AA adducts were confirmed by comparing chromatographic retention time with synthetic standards, by high-accuracy MS, and MS/MS analyses. LC–MS/MS analysis of the urine samples collected from the AAs-dosed rats demonstrated a time-dependent decrease in the urinary adduct levels, indicating the urinary DNA-AA adduct levels were reflective of the tissue adduct levels. It is expected that the developed approach of detecting urinary DNA-AA adducts will facilitate further carcinogenesis investigations of AAs." @default.
- W2000208636 created "2016-06-24" @default.
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- W2000208636 date "2014-08-01" @default.
- W2000208636 modified "2023-10-01" @default.
- W2000208636 title "Noninvasive measurement of aristolochic acid-DNA adducts in urine samples from aristolochic acid-treated rats by liquid chromatography coupled tandem mass spectrometry: Evidence for DNA repair by nucleotide-excision repair mechanisms" @default.
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- W2000208636 doi "https://doi.org/10.1016/j.mrfmmm.2014.05.004" @default.
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