MiR-34a inhibits migration and invasion by regulating the SIRT1/p53 pathway in human SW480 cells
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Mingguang Lai1, Gang Du2, Ruiyue Shi1
1Department of Gastroenterology, Shenzhen People's Hospital, Shenzhen, Guangdong 518020, P.R. China.
Abstract:
MicroRNA-34a (miR-34a) is a direct transcriptional target of p53, and is downregulated in several different types of cancer. However, the underlying mechanism of the miR-34a effects in colorectal cancer is not well understood. In this study, we explored the role of miR-34a in cell invasion, migration, and apoptosis. Transient overexpression of miR-34a in SW480 cells caused a severe decrease in cell migration and invasion (both, p<0.05) compared to the control groups. Combining miR-34a transfection with 5-fluorouracil (5-FU) treatment further enhanced the inhibition in SW480 cell migration and invasion (both, p<0.05) compared to 5-FU treatment alone. These cellular changes were associated with upregulation of acetylated‑p53 (ac-p53) and p21 and downregulation of sirtuin 1 (SIRT1). These data demonstrate that miR-34a regulates the expression of a number of critical proteins involved in apoptosis, proliferation and the response to chemotherapy. In summary, miR-34a increases the sensitivity of colon cancer cells to 5-FU treatment through specific regulation of the SIRT1/p53 pathway.
Insights
MicroRNA-34a (miR-34a) enhances colon cancer cell sensitivity to 5-fluorouracil (5-FU) chemotherapy. This involves regulating SIRT1/p53 pathway proteins, decreasing cell invasion and migration.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- MicroRNA-34a (miR-34a) is a tumor suppressor targeted by p53, but its role in colorectal cancer remains unclear.
- Understanding miR-34a's mechanism is crucial for developing targeted colorectal cancer therapies.
Purpose of the Study:
- To investigate the functional role of miR-34a in colorectal cancer cell invasion, migration, and apoptosis.
- To elucidate the molecular mechanisms underlying miR-34a's effects, particularly in conjunction with 5-fluorouracil (5-FU) chemotherapy.
Main Methods:
- Transient overexpression of miR-34a in SW480 colorectal cancer cells.
- Assessment of cell migration and invasion assays.
- Analysis of protein expression, including acetylated-p53 (ac-p53), p21, and sirtuin 1 (SIRT1).
Main Results:
- Overexpression of miR-34a significantly reduced SW480 cell migration and invasion.
- Combined miR-34a transfection and 5-FU treatment further inhibited cell migration and invasion.
- These effects correlated with increased ac-p53 and p21, and decreased SIRT1 expression.
Conclusions:
- miR-34a plays a critical role in suppressing colorectal cancer cell invasion and migration.
- miR-34a enhances the efficacy of 5-FU chemotherapy in colon cancer cells.
- The SIRT1/p53 pathway is a key mediator of miR-34a's tumor-suppressive functions and chemosensitization effects.
