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Published on: April 6, 2012
MicroRNA-19a targets tissue factor to inhibit colon cancer cells migration and invasion
1Department of General Surgery, First Hospital of Peking University, No. 8 Xishiku Street, West District, Beijing 100034, China.
Abstract:
The over-expression of tissue factor (TF) and its roles in colon cancer progression have attracted much attention. However, the mechanisms regulating TF expression have not yet been shown in detail. In this study, we over-expressed miR-19a, miR20a and miR-106b in colon cancer cells, and evaluated their impact on TF expression and cellular function. We provide evidence demonstrating that miR-19a inhibited TF expression in vitro. Luciferase reporter assay confirmed that TF was a direct target of miR-19a because the miR-19a mediated repression of luciferase activity was abolished by mutation of the putative binding site. Moreover, miR-19a suppressed colon cancer cell migration and invasion. This effect was due to the indirect down-regulation of matrix metalloproteinase 9. Finally, we investigated the relevance of TF and miR-19a expression in a total of 48 paired colon cancer samples and revealed that miR-19a was inversely correlated with TF expression in stages I and II cases. Therefore, our results suggested that miR-19a was capable of suppressing TF expression in vitro and inhibiting cell migration and invasion. Although it was not the unique mechanism responsible for the expression of TF in vivo, miR-19a was inversely correlated with TF expression in early stage colon cancer patients.
Insights
MicroRNA-19a (miR-19a) suppresses colon cancer progression by inhibiting tissue factor (TF) expression and reducing cell migration. This finding offers potential therapeutic targets for early-stage colon cancer.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Tissue factor (TF) is overexpressed in colon cancer, but regulatory mechanisms remain unclear.
- Understanding TF regulation is crucial for developing targeted colon cancer therapies.
Purpose of the Study:
- To investigate the role of miR-19a, miR20a, and miR-106b in regulating TF expression and colon cancer cell function.
- To elucidate the molecular mechanisms underlying miR-19a's impact on TF and cancer progression.
Main Methods:
- Overexpression of miR-19a, miR20a, and miR-106b in colon cancer cells.
- Luciferase reporter assays to confirm direct targeting of TF by miR-19a.
- Assessment of cell migration, invasion, and matrix metalloproteinase 9 (MMP-9) expression.
- Analysis of TF and miR-19a expression in patient-matched colon cancer tissues.
Main Results:
- miR-19a significantly inhibited TF expression in colon cancer cells.
- TF was identified as a direct target of miR-19a.
- miR-19a suppressed colon cancer cell migration and invasion, partly via MMP-9 down-regulation.
- A negative correlation between miR-19a and TF expression was observed in early-stage (I and II) colon cancer samples.
Conclusions:
- miR-19a suppresses TF expression and inhibits colon cancer cell migration and invasion.
- miR-19a represents a potential therapeutic target for early-stage colon cancer.
- While not the sole regulator, miR-19a's inverse correlation with TF in early stages highlights its clinical relevance.
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