Abstract
We have investigated the effect of 13 flavonoid derivatives on [(14)C]paclitaxel transport in two human breast cancer cell lines, the adriamycin-resistant NCI/ADR-RES and sensitive MDA-MB-435. For this study, we selected representatives of aurones, chalcones, flavones, flavonols, chromones, and isoflavones with known binding affinity toward nucleotide-binding domain (NBD2) of P-glycoprotein and for which no reported work is available regarding paclitaxel transport. Aurones CB-284, CB-285, CB-287, and ML-50 most effectively inhibited P-gp related transport in the resistant line in comparison with chalcones, flavones, flavonols, chromones, and isoflavone derivatives and accordingly increased the accumulation of [(14)C]paclitaxel and decreased its efflux. Those agents efficiently modulated paclitaxel transport in P-gp highly expressing resistant human breast cancer cells and they could increase the efficiency of chemotherapy in paclitaxel-resistant tumors. In contrast, the sensitive cell line responded reversely in that CB-284, CB-285, CB-287, and ML-50 significantly inhibited accumulation of [(14)C]paclitaxel and especially CB-287, which significantly stimulated its efflux. Some, but not all, of the data correlated with the bindi...Continue Reading
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