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We studied the effects of nine cytotoxic drugs on three groups of B-lymphoblastoid cell lines transformed by Epstein-Barr virus (EBV): group 1, mortal cell lines from normal individuals; group 2, immortalized cell lines from normal individuals with strong telomerase activity; group 3, mortal cell lines from Werner's syndrome (WS) patients. Aminoglycoside antibiotics and alkylating drugs showed significantly stronger cytotoxic effects on immortalized cell lines than on mortal cell lines or the cell lines before immortalization. In contrast, topoisomerase II inhibitors showed no difference or they tended to be less cytotoxic to immortalized cell lines. Mortal cell lines from normal individuals and WS patients showed no difference in sensitivity against all the drugs examined except for the topoisomerase I inhibitor, camptothecin, which had a stronger cytotoxic effect on WS cell lines than other cell lines. We discuss the mechanisms underlying these cytotoxic effects.

Differential Effects of Cytotoxic Drugs on Mortal and Immortalized B-Lymphoblastoid Cell Lines from Normal and Werner's Syndrome Patients.