The K562 cell line derived from a chronic myelogenous leukemia (CML) patient exhibits ATP-dependent exclusion of the multidrug resistance (MDR)-type drugs. The protein tyrosine kinases inhibitors, imatinib mesylate and AG957 allowed for increased doxorubicin and calcein-AM accumulation in these cells. Maximal modulation was achieved at 3 and 10muM imatinib and AG957, respectively. This imatinib concentration is comparable to the plasma steady state levels observed in patients.
 


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