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• W1828528528 startingPage "661" @default.
• W1828528528 abstract "The anticancer anthracycline compound Adriamycin is a known topoisomerase II inhibitor but is also capable of exerting other cellular consequences. After intercalation, Adriamycin can form covalent adducts with DNA, and the magnitude of these adducts appears to be limited by the cellular availability of formaldehyde. Adducts produced by Adriamycin in the presence of formaldehyde have been well characterized in cell-free systems but not in cells. In this study, we show that when Adriamycin is used in conjunction with the formaldehyde-releasing prodrug AN-9 in IMR-32 tumor cells, this allows the formation of sufficiently high levels of adducts in genomic DNA to enable detection of their DNA sequence specificity for the first time. The 340-bp alpha-satellite EcoRI repeat sequence was isolated from drug-treated cells and digested with lambda-exonuclease to determine adduct sites at which exonuclease digestion was blocked. The Adriamycin adducts were formed predominantly at 5'-GC and GG sequences and unstable with respect to elevated temperatures and extended times at 37 degrees C. The use of three anthracycline derivatives lacking a 3'amino group demonstrated that this amino portion is critical for the formation of anthracycline adducts in cells. The structure of these drug-DNA adducts can therefore be considered to be identical to the Adriamycin adducts, which have been characterized rigorously in cell-free systems by X-ray crystallography, two-dimensional nuclear magnetic resonance, and mass spectrometry." @default.
• W1828528528 created "2016-06-24" @default.
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• W1828528528 date "2003-07-01" @default.
• W1828528528 modified "2023-09-23" @default.
• W1828528528 title "Sequence specificity of adriamycin-DNA adducts in human tumor cells." @default.
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