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Molecular Profiling of the Invasive Tumor Microenvironment in a 3-Dimensional Model of Colorectal Cancer Cells and Ex vivo Fibroblasts
Published on: April 29, 2014
MicroRNA profiling in human colon cancer cells during 5-fluorouracil-induced autophagy
1Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, China.
Abstract:
Autophagy modulation is now recognized as a potential therapeutic approach for cancer (including colorectal cancer), yet the molecular mechanisms regulating autophagy in response to cellular stress are still not well understood. MicroRNAs (miRNAs) have been found to play important roles in controlling many cellular functions, including growth, metabolism and stress response. The physiological importance of the miRNA-autophagy interconnection is only beginning to be elucidated. MiRNA microarray technology facilitates analysis of global miRNA expression in certain situations. In this study, we explored the expression profile of miRNAs during the response of human colon cancer cells (HT29s) to 5-FU treatment and nutrient starvation using miRNA microarray analysis. The alteration of miRNA expression showed the same pattern under both conditions was further testified by qRT-PCR in three human colon cancer cell lines. In addition, bioinformatic prediction of target genes, pathway analysis and gene network analysis were performed to better understand the roles of these miRNAs in the regulation of autophagy. We identified and selected four downregulated miRNAs including hsa-miR-302a-3p and 27 upregulated miRNAs under these two conditions as having the potential to target genes involved in the regulation of autophagy in human colon cancer cells. They have the potential to modulate autophagy in 5-FU-based chemotherapy in colorectal cancer.
Insights
MicroRNAs (miRNAs) regulate autophagy, a key process in cancer. This study identified specific miRNAs that change during stress, offering potential targets for colorectal cancer therapies.
Area of Science:
- Molecular Biology
- Cellular Biology
- Oncology
Background:
- Autophagy modulation is a promising cancer therapy, but its regulation by cellular stress is not fully understood.
- MicroRNAs (miRNAs) are crucial regulators of cellular functions, including stress responses.
- The interplay between miRNAs and autophagy is an emerging area of research.
Purpose of the Study:
- To investigate miRNA expression profiles in human colon cancer cells under stress conditions (5-FU treatment and nutrient starvation).
- To identify specific miRNAs involved in regulating autophagy in colorectal cancer.
- To explore the potential of these miRNAs in modulating autophagy for cancer therapy.
Main Methods:
- Utilized miRNA microarray analysis to profile miRNA expression in HT29 colon cancer cells.
- Validated miRNA expression changes using quantitative reverse transcription PCR (qRT-PCR) across three colon cancer cell lines.
- Employed bioinformatic tools for target gene prediction, pathway analysis, and gene network analysis.
Main Results:
- Identified a consistent pattern of miRNA expression alterations under both 5-FU treatment and nutrient starvation.
- Discovered four downregulated miRNAs, including hsa-miR-302a-3p, and 27 upregulated miRNAs.
- These miRNAs were predicted to target genes critical for autophagy regulation in colon cancer cells.
Conclusions:
- Specific miRNA expression patterns are associated with cellular stress responses in colorectal cancer.
- Certain miRNAs, like hsa-miR-302a-3p, show potential as regulators of autophagy.
- These findings suggest novel therapeutic strategies for colorectal cancer by targeting miRNA-autophagy pathways in chemotherapy.
