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- W2100084105 abstract "Abstract Resistance to chemotherapy is one of the principal causes of cancer mortality and is generally considered a late event in tumor progression. Although cellular models of drug resistance have been useful in identifying the molecules responsible for conferring drug resistance, most of these cellular models are derived from cell lines isolated from patients at a late stage in cancer progression. To ask at which stage in the tumorigenic progression does the cell gain the ability to acquire drug resistance, we generated a series of pretumorigenic and tumorigenic cells from human embryonic skin fibroblasts by introducing, sequentially, the catalytic subunit of telomerase, SV40 large T and small T oncoproteins, and an oncogenic form of ras. We show that the ability to acquire multidrug resistance (MDR) can arise before the malignant transformation stage. The minimal set of changes necessary to obtain pretumorigenic drug-resistant cells is expression of telomerase and inactivation of p53 and pRb. Thus, the pathways inactivated during tumorigenesis also confer the ability to acquire drug resistance. Microarray and functional studies of drug-resistant pretumorigenic cells indicate that the drug efflux pump P-glycoprotein is responsible for the MDR phenotype in this pretumorigenic cell model. [Cancer Res 2007;67(3):1130–7]" @default.
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- W2100084105 date "2007-02-01" @default.
- W2100084105 modified "2023-10-14" @default.
- W2100084105 title "Ability to Acquire Drug Resistance Arises Early during the Tumorigenesis Process" @default.
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- W2100084105 doi "https://doi.org/10.1158/0008-5472.can-06-2574" @default.
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