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Correlation of multidrug resistance (MDR1) protein expression with functional dye/drug efflux in acute myeloid leukemia by multiparameter flow cytometry: identification of discordant MDR-/efflux+ and MDR1+/efflux- cases

CP Leith, IM Chen, KJ Kopecky, FR Appelbaum, DR Head, JE Godwin, JK Weick and CL Willman

University of New Mexico School of Medicine, Department of Pathology, Albuquerque, NM, USA.

Resistance to chemotherapy is a major factor limiting successful treatment of acute myeloid leukemia (AML); one of the best characterized drug resistance mechanisms is extrusion of drugs by the energy-dependent multidrug resistance (MDR1) transport protein. Expression of MDR1 is common in AML and has been linked to lower remission induction rates and decreased remission durations. Because MDR1 efflux function may be modified by drugs such as cyclosporin A, accurate identification of MDR1+/efflux+ AML cases will be critical to identify patients who may benefit from therapies that contain such MDR1 modulators. We have optimized single and multiparameter flow cytometric assays to detect efflux of drugs or fluorescent dyes by previously cryopreserved AML blasts. These assays allowed precise identification of efflux by leukemic blasts, and correlation with CD34 and MDR1 expression. We subsequently studied a series of 60 previously untreated AML cases. Functional efflux was identified in 39 cases and was significantly correlated with MDR1 expression (P = .0002). However, discrepant cases were identified; 10 cases were efflux+ without significant MDR1 expression, whereas 6 MDR1+ cases were efflux-. There was also a highly significant correlation of efflux with CD34; 31 (79%) of the 39 efflux+ cases were CD34+ in comparison with only 5 (24%) of the 21 efflux- cases (P < .0001). Multivariate analysis showed that efflux was significantly associated with independent effects of both CD34 (P = .0011) and MDR1 expression (P = .034); the majority of efflux+ cases were CD34+, whereas 5 of the 6 MDR1+ efflux- cases lacked CD34 expression. Cyclosporin A blocked efflux in all but 2 cases regardless of MDR1 expression. Functional efflux in AML is frequently detected without the classic MDR1+ phenotype indicating that alternate non-MDR1-mediated efflux mechanisms may be important. Efflux assays may better identify patients who would benefit from therapies that include efflux modulators.

Volume 86, Issue 6, pp. 2329-2342, 09/15/1995
Copyright © 1995 by The American Society of Hematology


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