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• W2036755280 abstract "Fluorescence emission spectra from anthracycline-treated cells suspended in buffer have been studied. The kinetics of uptake and the nuclear concentration of anthracyclines in human lymphocytes have thus been determined using the fluorescence properties of these drugs. Four anthracyclines have been used: adriamycin (ADR), 4′-O-tetrahydropyranyladriamycin (THP-ADR), carminomycin (CAR) and aclacinomycin A (ACM). We have shown that no quenching of the drug fluorescence is obtained through interaction of the drugs with the various components of the cell except the nucleus. No quenching is observed with cell lacking nucleus such as platelets and erythrocytes. Quenching of drug fluorescence occurs when drugs intercalate between base pairs of DNA only. This allows rapid determination of the amount of drug intercalated between nuclear base pairs in the steady state. We have thus estimated that one molecule of drug can bind for every 10, 8.3, 10 and 6.7 DNA base pairs in the case of ADR, THP-ADR, ACM and CAR, respectively. The kinetics of drug incorporation into the nucleus, once the cells have been solubilized with triton X-100, is very fast for the four drugs. However, the kinetics of drug uptake by the intacts cells strongly depends on the nature of the drug. When 109 cells/l are incubated with 1 μM drug, 50% of the final nuclear concentration is reached within 97 min, 3.2 min, 3.0 min and 1.2 min in the case of ADR, THP-ADR, CAR and ACM, respectively. The kinetics directly correlates with the polarity of the molecule." @default.
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• W2036755280 date "1989-09-01" @default.
• W2036755280 modified "2023-10-16" @default.
• W2036755280 title "Anthracycline incorporation in human lymphocytes. Kinetics of uptake and nuclear concentration" @default.
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• W2036755280 doi "https://doi.org/10.1016/0167-4889(89)90038-4" @default.
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