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SW-620 cells treated with topoisomerase I inhibitor SN-38: gene expression profiling
Vinicius Souza1, Yan Bin Dong, H Sam Zhou
1Division of Surgical Oncology, Department of Surgery, University of Louisville School of Medicine, Louisville, Kentucky, USA. vinniesouza@hotmail.com
Background:
The goal of this study was to evaluate changes in gene expression in SW-620 cells in response to SN-38 in order to further elucidate the mechanisms by which SN-38 causes apoptosis and cell cycle arrest.
Methods:
We used a quantitative gene expression microarray assay to identify the genes regulated by SN-38 treatment in colon cancer cells and confirmed our results with RT-PCR. By gene expression profiling, we first screened a proprietary list of about 22,000 genes.
Results:
Treatment with SN-38 cells resulted in two-fold or greater alteration in the level of expression of 192 genes compared to control treatment. Most of the affected genes were not known to be responsive to SN-38 prior to this study. SN-38 treatment of these cells was found to affect the expression of various genes involved in DNA replication, transcription, signal transduction, growth factors, cell cycle regulation, and apoptosis, as well as other genes with unknown function. Changes in expression of 14 genes were confirmed by quantitative real-time polymerase chain reaction (RT-PCR).
Conclusion:
This study leads to an increased understanding of the biochemical pathways involved in SN-38-induced apoptosis and possibly to the identification of new therapeutic targets.
Insights
SN-38 treatment alters gene expression in colon cancer cells, impacting DNA replication, cell cycle, and apoptosis pathways. This research identifies new potential therapeutic targets for cancer treatment.
Area of Science:
- Molecular Biology
- Cancer Research
- Genomics
Background:
- Colon cancer cells (SW-620) were studied to understand SN-38's effects.
- SN-38 is known to induce apoptosis and cell cycle arrest.
Purpose of the Study:
- To evaluate gene expression changes in SW-620 cells treated with SN-38.
- To elucidate the mechanisms of SN-38-induced apoptosis and cell cycle arrest.
Main Methods:
- Quantitative gene expression microarray assay used to screen ~22,000 genes.
- Gene expression profiling identified SN-38-regulated genes in colon cancer cells.
- Results confirmed using quantitative real-time polymerase chain reaction (RT-PCR).
Main Results:
- SN-38 treatment altered the expression of 192 genes by two-fold or more.
- Affected genes are involved in DNA replication, transcription, signal transduction, growth factors, cell cycle regulation, and apoptosis.
- 14 gene expression changes were validated by RT-PCR.
Conclusions:
- Enhanced understanding of SN-38's role in apoptosis biochemical pathways.
- Potential identification of novel therapeutic targets for colon cancer treatment.
