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Novel MicroRNA Sponges to Specifically Modulate Gene Expression in Colon Cancer Cells
Ana R Rama1,2,3, Gloria Perazzoli1,2, Laura Cabeza1,2,3
1Institute of Biopathology and Regenerative Medicine (IBIMER), Center of Biomedical Research (CIBM), University of Granada, Granada, Spain.
Abstract:
MicroRNA (miRNA) sponges allow the selective blockade of a complete family of associated miRNAs, which induce post-transcriptional gene silencing in their target through binding to 3'UTR mRNA. miRNA-365 and miRNA-145 are downregulated in colorectal cancer (CRC) but not in healthy tissues. Based on this, we constructed two vectors by inserting miRNA sponges (one for miRNA-365 and other for miRNA-145), and used enhanced green fluorescent protein (EGFP) as a 3'UTR reporter gene to analyze the ability of each sponge to catch its respective miRNA. Quantitative polymerase chain reaction (qPCR) results corroborated that the expression levels of both miRNAs were lower in CRC cell lines than in normal colon cell lines. Flow cytometry analysis revealed a decrease of the EGFP expression levels in the cell lines transfected with both sponges, being higher on the normal cell line while CRC cell lines presented a minimal decline. Also, this decrease was inversely proportional to the levels of expression of both miRNAs obtained by qPCR. These results were corroborated by fluorescence microscopy, showing a similar decrease in fluorescence. We propose a new vector system to carry in a specific way the expression of genes to CRC cells without affecting healthy cells, preventing damage to healthy tissues.
Insights
Researchers developed novel miRNA sponges to target colorectal cancer (CRC) cells. These sponges selectively block specific microRNAs (miRNAs) in cancer cells, offering a potential strategy to deliver therapeutic genes specifically to tumors while sparing healthy tissues.
Area of Science:
- Molecular Biology
- Cancer Research
- Gene Regulation
Background:
- MicroRNAs (miRNAs) regulate gene expression post-transcriptionally by binding to mRNA 3'UTRs.
- Downregulation of miRNA-365 and miRNA-145 is observed in colorectal cancer (CRC) but not in healthy tissues.
- Targeting specific miRNAs in cancer cells offers a potential therapeutic strategy.
Purpose of the Study:
- To construct and validate miRNA sponges for miRNA-365 and miRNA-145.
- To assess the efficacy of these sponges in selectively targeting CRC cells.
- To propose a novel vector system for targeted gene delivery in CRC.
Main Methods:
- Construction of two vectors containing miRNA sponges for miRNA-365 and miRNA-145.
- Utilized enhanced green fluorescent protein (EGFP) as a 3'UTR reporter gene.
- Quantitative polymerase chain reaction (qPCR) and flow cytometry for expression analysis.
- Fluorescence microscopy to visualize EGFP expression.
Main Results:
- qPCR confirmed lower expression of miRNA-365 and miRNA-145 in CRC cell lines compared to normal colon cell lines.
- Flow cytometry showed decreased EGFP expression in cells transfected with sponges, with a greater decrease in normal cells.
- EGFP expression reduction was inversely proportional to endogenous miRNA levels.
- Fluorescence microscopy corroborated the flow cytometry findings.
Conclusions:
- The developed miRNA sponges effectively capture their target miRNAs.
- This vector system demonstrates potential for targeted gene delivery to CRC cells.
- The approach minimizes damage to healthy tissues by sparing normal cells.
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