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Predominance of functional multidrug resistance (MDR-1) phenotype in CD34+
acute myeloid leukemia cells
PA te Boekhorst, K de Leeuw, M Schoester, S Wittebol, K Nooter, A Hagemeijer, B Lowenberg and P Sonneveld
Department of Hematology, Erasmus University, Rotterdam, The Netherlands.
The expression of the MDR-1-encoded P-170 glycoprotein (P-170) associated
with clinical multidrug resistance (MDR) was investigated in 52 consecutive
patients with untreated acute myeloid leukemia (AML). P- 170 expression was
analyzed in correlation with CD34 expression and clinical response. Thirty
of 52 patients expressed P-170 (58%). Eight of 30 P-170+ as compared with
16 of 22 P-170- patients achieved a complete remission (CR) (27% v 73%, P =
.003). In 21 of 30 P-170+ patients, expression of the CD34 antigen was
observed in greater than 10% of the blast cells, as compared with 14 of 22
P-170- patients (70% v 64%, P > .05). The CR rate of CD34+ and CD34-
patients was 31% and 76%, respectively (P = .006). In AMLs that
simultaneously expressed both P-170 and CD34, the CR rate was worse as
compared with those negative for P-170 and CD34 (5% v 63%, P = .004). In 12
patients (8 P- 170+, 4 P-170-) CD34 and P-170 expression were further
characterized by double fluorescence studies. It was shown that P-170+
cells were largely, but not exclusively, restricted to the CD34+ cell
population. For the 8 P-170+ AML samples, the median ratio of P-170+/P-170-
in CD34+ cells was 4.845 (range, 0.60 to 25.00) as compared with 0.135
(range, 0.02 to 0.67) in CD34- cells. In these 12 AML samples, the presence
of functional resistance as defined by reduced daunorubicin accumulation
was evaluated in CD34+ and CD34- AML cells. In 8 of 8 P- 170+ patients,
intracellular daunorubicin accumulation in CD34+ AML blast cells was lower
than in CD34- cells, and it increased after cyclosporin addition. No
difference of intracellular daunorubicin accumulation was observed between
CD34+ and CD34- AML cells of 4 P-170- patients. These data indicate that
P-170 expression in AML with a heterogeneous CD34+ phenotype seems
predominantly present in CD34+ AML blast cells.
Volume 82,
Issue 10,
pp. 3157-3162,
11/15/1993
Copyright © 1993 by The American Society of Hematology

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