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Monitoring the expression profiles of doxorubicin-induced and doxorubicin-resistant cancer cells by cDNA microarray
1Department of Medicine and The Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Brunswick 08901, USA.
Abstract:
Drug resistance in cancer is a major obstacle to successful chemotherapy. Cancer cells exposed to antitumor drugs may be directly induced to express a subset of genes that could confer resistance, thus allowing some cells to escape killing and form the relapsed resistant tumor. Alternatively, some cancer cells may be expressing an array of genes that could confer intrinsic resistance, and exposure to cytotoxic drugs select for the survival of these cells that form the relapsed tumor. We have used cDNA microarray to monitor the expression profiles of MCF-7 cells that are either transiently treated with doxorubicin or selected for resistance to doxorubicin. Our results showed that transient treatment with doxorubicin altered the expression of a diverse group of genes in a time-dependent manner. A subset of the induced genes was also found to be constitutively overexpressed in cells selected for resistance to doxorubicin. This distinct set of overlapping genes may represent the signature profile of doxorubicin-induced gene expression and resistance in cancer cells. Our studies demonstrate the feasibility of obtaining potential molecular profile or fingerprint of anticancer drugs in cancer cells by cDNA microarray, which might yield further insights into the mechanisms of drug resistance and suggest alternative methods of treatment.
Insights
Cancer cells can develop drug resistance through gene expression changes. This study identifies a gene expression signature linked to doxorubicin resistance in cancer cells, aiding in understanding and potentially overcoming this challenge.
Area of Science:
- Oncology
- Molecular Biology
- Genomics
Background:
- Drug resistance is a significant challenge in cancer chemotherapy.
- Cancer cells can acquire resistance intrinsically or develop it upon drug exposure.
- Understanding gene expression changes is crucial for overcoming resistance.
Purpose of the Study:
- To investigate gene expression profiles in MCF-7 cells treated with doxorubicin.
- To identify genes associated with transient drug exposure and acquired resistance.
- To establish a molecular fingerprint for doxorubicin-induced gene expression and resistance.
Main Methods:
- Utilized cDNA microarray technology.
- Monitored gene expression profiles in MCF-7 cells.
- Compared expression patterns after transient doxorubicin treatment and selection for resistance.
Main Results:
- Transient doxorubicin treatment induced time-dependent changes in gene expression.
- A subset of induced genes was also overexpressed in doxorubicin-resistant cells.
- Identified an overlapping gene set potentially representing a resistance signature.
Conclusions:
- cDNA microarray can reveal molecular drug profiles in cancer cells.
- The identified gene signature offers insights into doxorubicin resistance mechanisms.
- Findings may guide alternative treatment strategies for resistant cancers.