Abstract
The emergence and outgrowth of a population of tumour cells resistant to multiple drugs is a major problem in the chemotherapeutic treatment of cancer. We have used highly drug-resistant cell lines developed in vitro to study the molecular basis of multidrug resistance. In these cell lines high levels of resistance are frequently associated with amplification and overexpression of a small group of genes termed mdr (refs 1–3) or gp170 (ref. 4). Direct evaluation of the role of these genes in multidrug resistance has awaited the isolation of a member of this gene family in a biologically active form. Here we report the isolation of DNA clones complementary to the cellular messenger RNA transcripts of mdr genes and show that high-level expression of a full-length complementary DNA clone in an otherwise drug-sensitive cell confers a complete multidrug-resistant phenotype. Our results demonstrate that overexpression of a single member of the mdr group is sufficient to confer drug resistance. Furthermore, because the cDNA was isolated from a drug-sensitive cell, mutations in the primary sequence of mdr are not required to produce a multi-drug-resistance phenotype.
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Gros, P., Neriah, Y., Croop, J. et al. Isolation and expression of a complementary DNA that confers multidrug resistance. Nature 323, 728–731 (1986). https://doi.org/10.1038/323728a0
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DOI: https://doi.org/10.1038/323728a0
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