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- W2157876917 abstract "Two doxorubicin-selected human tumor cell lines, H69AR and HT1080/DR4, display a multidrug resistance phenotype but do not overexpress P-glycoprotein. Recently, a 6.5-kilobase mRNA encoding a novel member of the ATP-binding cassette superfamily of transport proteins, designated multidrug resistance-associated protein (MRP), has been identified in the H69AR cell line. In the present study, the levels of MRP mRNA were found to be 14-fold higher in HT1080/DR4 cells relative to sensitive HT1080 cells. Southern blotting indicates that gene amplification contributes to the overexpression of MRP in HT1080/DR4 cells. Using a 4-kilobase MRP complementary DNA probe, MRP genes were localized to 2-5 chromosomes bearing homogeneously staining regions and to multiple double minute chromosomes in H69AR cells. Resistant H69AR cells also contained a new der(16) with a structural aberration affecting 16p13.1, the normal cellular locus of the MRP gene. The MRP probe hybridized to two small homogeneously staining regions (hsr) in HT1080/DR4 cells including hsr(7)(p12p15). MRP localization was restricted to the normal cellular locus, 16p13.1, in the parental H69 and HT1080 cells and the drug-sensitive H69PR revertant cells. Our data provide combined evidence that amplification of the MRP gene is associated with the expression of drug resistance in selected solid tumor cell lines." @default.
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- W2157876917 date "1993-07-15" @default.
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- W2157876917 title "Localization of a novel multidrug resistance-associated gene in the HT1080/DR4 and H69AR human tumor cell lines." @default.
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