In vitro schedule-dependent interaction between paclitaxel and cisplatin in human carcinoma cell lines

Cancer Chemotherapy and Pharmacology
Y KanoY Yazawa

Abstract

The schedule-dependent interaction of paclitaxel and cisplatin was studied in four human carcinoma cell lines: non-small cell lung cancer, A549; breast cancer, MCF7; ovarian cancer, PA1; and colon cancer, WiDr cells. The cells were exposed simultaneously to the drugs for 24 h and sequentially to paclitaxel first for 24 h followed by cisplatin for 24 h, or vice versa, and then incubated in drug-free medium for 4 and 3 days, respectively. Cell growth inhibition was then determined by the 1-(4,5-dimethylthiazol-2-yl)-3,5-diphenyltetrazolium bromide (MTT) reduction assay. The effects of drug combinations at the IC80 level were analyzed by the isobologram method. On simultaneous exposure to paclitaxel and cisplatin, additive and subadditive (slight antagonistic) effects were observed in A549, MCF7, and PA1 cells, while sub-additive and protective (antagonistic) effects were observed in WiDr cells. On sequential exposure to paclitaxel first, followed by cisplatin, additive effects were observed in all cell lines. On sequential exposure to cisplatin first, followed by paclitaxel, additive effects were observed in PA1 cells, while additive, sub-additive, and protective effects were observed in A549, MCF7, and WiDr cells. These findings...Continue Reading

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