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• W1501188086 abstract "Hormone stimulation of responsive neoplasms is a potential strategy for improving the target selectivity of cancer chemotherapy. Using an alkaline DNA-unwinding technique to detect drug-induced DNA strand breakage, we have shown that estrogen stimulation of T-47D human breast cancer cells enhances induction of DNA cleavage by etoposide (VP-16), 4',9-acridinylaminomethanesulfon-m-anisidide (m-AMSA), mitoxantrone, and doxorubicin, drugs known to interact with the DNA-modifying enzyme topoisomerase II. No enhancement of DNA cleavage or cytotoxicity was seen in estrogen-treated cells exposed to X-rays or bleomycin. Novobiocin (an inhibitor of topoisomerase II) markedly antagonized the enhancing effect of estrogen on VP-16-induced DNA cleavage, while neutral nucleoid sedimentation detected less than 10% of such strand breaks revealed in estrogen-treated cells by alkaline unwinding. Estrogen did not affect DNA repair of lesions induced by X-rays, VP-16, or ultraviolet radiation. Enhancement of DNA cleavage was accompanied by a corresponding enhancement of cytotoxicity in cells treated with VP-16 or m-AMSA, but only minimal enhancement of cytotoxicity was seen following treatment with mitoxantrone or doxorubicin. Estrogen-treated and control cells treated with VP-16 and m-AMSA sustained similar levels of DNA cleavage for equivalent levels of cytotoxicity. These findings suggest that estrogen potentiates the cytotoxicity of VP-16 and m-AMSA by enhancing topoisomerase II-mediated DNA damage but that such damage does not contribute significantly to cytotoxicity induced by mitoxantrone or doxorubicin. Estrogen stimulation of receptor-positive breast cancer may prove to be a clinically relevant strategy for improving the selectivity and cytotoxicity of some, but not all, topoisomerase II-interactive drugs." @default.
• W1501188086 created "2016-06-24" @default.
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• W1501188086 date "1988-01-15" @default.
• W1501188086 modified "2023-10-12" @default.
• W1501188086 title "Estrogen-induced potentiation of DNA damage and cytotoxicity in human breast cancer cells treated with topoisomerase II-interactive antitumor drugs." @default.
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