RS-33295-198 : a novel, potent modulator of P-glycoprotein-mediated multidrug resistance
1995
A novel multidrug resistance modulator RS-33295-198, circumvented drug resistance in human, mouse, and Chinese hamster cell lines overexpressing P-glycoprotein. It enhanced the antiproliferative activity of doxorubicin, vincristine, etoposide, and paclitaxel and increased doxorubicin retention in multidrug-resistant hamster CH R C5 cells. RS-33295-198 modulated doxorubicin resistance in a murine P388/ADR leukemia model when administered ip via continuous minipump delivery, ip by bolus injection, and orally ; it also improved the efficacy of vincristine toward P388/VCR leukemia when given ip or po. RS-33295-198 showed weak activity in enhancing doxorubicin efficacy against a multidrug-resistant human sarcoma xenograft.
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