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  • Title: Melphalan-induced DNA cross-linking in human melanoma cells and phytohaemagglutinin-stimulated lymphocytes in relation to intracellular drug content and cellular levels of glutathione.
    Author: Hansson J, Edgren M, Ehrsson H, Lewensohn R, Ringborg U.
    Journal: Anticancer Res; 1987; 7(1):97-104. PubMed ID: 3566189.
    Abstract:
    Melphalan-induced DNA cross-linking was compared in a human melanoma cell line (RPMI 8322) and in phytohaemagglutinin (PHA)-stimulated lymphocytes. In both cell types a delayed induction of DNA cross-links was observed, with maximum DNA cross-linking occurring 6-12 hours after drug exposure. Significantly higher peak levels of DNA cross-links were found in PHA-stimulated lymphocytes, total DNA cross-linking being 2.5 times and DNA interstrand cross-linking 2.2 times higher. The intracellular content of free melphalan was 1.3-fold higher in RPMI 8322 cells, thus the lower DNA cross-linking was not due to a lower drug concentration in these cells. RPMI 8322 cells had a 1.8-fold higher level of glutathione, possibly indicating a higher capacity of these cells to inactivate melphalan.
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