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Updated: Jun 4, 2026
Long-term Live-cell Imaging to Assess Cell Fate in Response to Paclitaxel
Published on: May 14, 2018
A microarray based expression profiling of paclitaxel and vincristine resistant MCF-7 cells
Meltem Demirel Kars1, Ozlem Darcansoy Işeri, Ufuk Gündüz
1Middle East Technical University, Department of Biological Sciences, 06531, Ankara, Turkey. meltem@selcuk.edu.tr
Abstract:
Resistance to the broad spectrum of chemotherapeutic agents in cancer cell lines and tumors has been called multiple drug resistance (MDR). In this study, the molecular mechanisms of resistance to two anticancer agents (paclitaxel and vincristine) in mammary carcinoma cell line MCF-7 were investigated. Drug resistant sublines to paclitaxel (MCF-7/Pac) and vincristine (MCF-7/Vinc) that were developed from sensitive MCF-7 cells (MCF-7/S) were used. cDNA microarray analysis was performed for the RNA samples of sensitive and resistant cells in duplicate experiments. GeneSpring GX 7.3.1 Software was used in data analysis. The results indicated that the upregulation of MDR1 gene is the dominating mechanism of the paclitaxel and vincristine drug resistance. Additionally the upregulation of the genes encoding the detoxifying enzymes (i.e. GSTP1) was observed. Significant downregulation of apoptotic genes (i.e. PDCD2/4/6/8) and upregulation of some cell cycle regulatory genes (CDKN2A, CCNA2 etc.) was seen which may be in close relation to MDR in breast cancer. Drug resistant cancer cells exhibit different gene expression patterns depending on drug treatment, and each drug resistance phenotype is probably genetically different. Further functional studies are needed to demonstrate the complete set of genes contributing to the drug resistance phenotype in breast cancer cells.
Insights
Multiple drug resistance (MDR) in breast cancer involves complex gene expression changes. Upregulation of MDR1 and detoxifying enzymes, alongside altered apoptotic and cell cycle genes, contributes to paclitaxel and vincristine resistance in MCF-7 cells.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Multiple drug resistance (MDR) is a significant challenge in cancer chemotherapy.
- Understanding the molecular basis of MDR is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the molecular mechanisms of resistance to paclitaxel and vincristine in MCF-7 breast cancer cells.
- To identify key genes and pathways involved in drug resistance.
Main Methods:
- Development of drug-resistant sublines (MCF-7/Pac, MCF-7/Vinc) from sensitive MCF-7 cells.
- cDNA microarray analysis to compare gene expression profiles of sensitive and resistant cells.
- Data analysis using GeneSpring GX 7.3.1 Software.
Main Results:
- Upregulation of the MDR1 gene was identified as a dominant mechanism for paclitaxel and vincristine resistance.
- Upregulation of detoxifying enzyme genes (e.g., GSTP1) was observed.
- Downregulation of apoptotic genes (e.g., PDCD family) and upregulation of cell cycle regulatory genes (e.g., CDKN2A, CCNA2) were noted.
Conclusions:
- Gene expression patterns in drug-resistant cancer cells vary based on the specific drug treatment.
- The MDR1 gene and altered expression of detoxifying, apoptotic, and cell cycle genes play significant roles in breast cancer drug resistance.
- Further functional studies are required to fully elucidate the genetic basis of drug resistance phenotypes.
