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- W1566875206 abstract "Camptothecin (CPT) derivatives are presently in ongoing Phase I/II clinical trials. The interactions between 9-aminocamptothecin (9AC) and cisplatin (CDDP) have been studied in the IGROV-1 human ovarian cancer cell line used in the National Cancer Institute Drug Discovery Anticancer Screen. One-h simultaneous treatment with 9AC and CDDP produced synergistic cytotoxicity. Under these conditions, 9AC delayed the reversal of CDDP-induced DNA interstrand cross-links (ISCs) without modifying the maximum ISC frequency at 6 h after drug treatment. CDDP did not affect the amount and the kinetics of reversion of 9AC-induced DNA single-strand breaks. Simultaneous treatment with CDDP and 9AC prolonged the DNA synthesis inhibition produced by each drug alone. Consistently, flow cytometry analyses showed enhanced S-phase arrest in cells treated with the CDDP-9AC combination. The DNA polymerase inhibitor aphidicolin also increased the residual CDDP-induced ISCs. These results suggest that prolonged inhibition of DNA synthesis by CPTs potentiate the cytotoxicity of CDDP by inhibiting the reversal of CDDP-induced DNA damage. Therefore, the combination of CPTs and CDDP appears to be worthwhile in cancer chemotherapy." @default.
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- W1566875206 date "1996-04-01" @default.
- W1566875206 modified "2023-09-23" @default.
- W1566875206 title "Potentiation of cisplatin cytotoxicity by 9-aminocamptothecin." @default.
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