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Vol. 54, Issue 5, 802-814, November 1998
Departamento Hematologia-Oncologia, Universidad Catolica de Chile,
Santiago, Chile (M.A.),
Medicine Branch, The MRP gene contributes to one form of multidrug
resistance. To identify drugs interacting with MRP, we measured MRP
mRNA expression by quantitative PCR in 60 cell lines of the National Cancer Institute Anticancer Drug Screen. Expression was detected in all
cell lines (highest in lung carcinomas and central nervous system
tumors) with a range of 14-fold. A mean graph of MRP mRNA levels was
constructed to determine Pearson correlation coefficients (PCCs) with
mean graphs of >40,000 compounds using the COMPARE analysis.
Only 20 compounds had PCCs of
0.500. The PCCs for VP-16, doxorubicin,
and vincristine were 0.008, 0.13, and 0.257, respectively. Initially,
36 compounds with PCCs of
0.428 were analyzed using two
MRP-overexpressing cell lines; low levels of cross-resistance was
demonstrated for 23 compounds (1.3-9.4-fold). Twenty-four compounds
also were available for further studies. Using a fluorescence activated
cell sorter assay to measure competition of calcein efflux from
MRP-overexpressing cells, 10 compounds were found to increase calcein
retention by
2-fold. Ten compounds also were able to reduce
ATP-dependent [3H]LTC4 transport into
vesicles from MRP-overexpressing cells. These results contrast with
previous studies with MDR-1 in which high correlations were
found and confirmed for a large number of compounds. Although other
assays may be more revealing, in these unselected cell lines, MRP mRNA
expression was a poor predictor of drug sensitivity. This raises the
possibility that other factors, including conjugating enzymes,
glutathione levels, or other transporters, confound the MRP effect.
Copyright © 1998 by The American Society for Pharmacology and Experimental Therapeutics
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