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  • Original Paper
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Gene expression and amplification in breast carcinoma cells with intrinsic and acquired doxorubicin resistance

Abstract

The multidrug resistance (MDR) phenotype is a major cause of cancer treatment failure. Here the expressions of 4224 genes were analysed for association with intrinsic or acquired doxorubicin (DOX) resistance. A cluster of overexpressed genes related to DOX resistance was observed. Included in this cluster was ABCB1 the P-glycoprotein transporter protein gene and MMP1 (Matrix Metalloproteinase 1), indicative of the invasive nature of resistant cells, and the oxytocin receptor (OXTR), a potential new therapeutic target. Overexpression of genes associated with xenobiotic transformation, cell transformation, cell signalling and lymphocyte activation was also associated with DOX resistance as was estrogen receptor negativity. In all carcinoma cells, compared with HBL100 a putatively normal breast epithelial cell line, a cluster of overexpressed genes was identified which included several keratins, in particular keratins 8 and 18 which are regulated through the ras signalling pathway. Analysis of genomic amplifications and deletions revealed specific genetic alterations common to both intrinsic and acquired DOX resistance including ABCB1, PGY3 (ABCB4) and BAK. The findings shown here indicate new possibilities for the diagnosis of DOX resistance using gene expression, and potential novel therapeutic targets for pharmacological intervention.

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Acknowledgements

The authors would like to thank Drs M Eisen and J DeRisi for their generous provision of software, Profs G Cohen, R Walker and Drs B Coyle and P Glynn for critical reading of the manuscript Dr K Lilley and colleagues for sequencing and David Jones and colleagues in the University MSB workshops for arrayer construction. TW Gant thanks Drs CA Shari, E Nuwaysir and Ms K Hayes for initial training at NIEHS. Particular thanks are due to Prof G Cohen (deputy director of the MRC Toxicology Unit) for his support of the microarray project.

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Turton, N., Judah, D., Riley, J. et al. Gene expression and amplification in breast carcinoma cells with intrinsic and acquired doxorubicin resistance. Oncogene 20, 1300–1306 (2001). https://doi.org/10.1038/sj.onc.1204235

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