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Published on: August 2, 2024
MicroRNA-125b Suppresses Ovarian Cancer Progression via Suppression of the Epithelial-Mesenchymal Transition Pathway
Xiaoyan Ying1, Kuang Wei, Zhe Lin
1Department of Obstetrics and Gynecology, Second Affiliated Hospital of Nanjing Medical University, Nanjing, China.
Background/Aims:
MicroRNA-125b (miR-125b) is overexpressed in several types of cancer and contributes to chemotherapy resistance. However, its role in epithelial ovarian carcinoma remains unknown. The goal of this study was to identify the relationship between miR-125b and the epithelial-mesenchymal transition (EMT) in ovarian cancer.
Methods:
In total, 55patients with epithelial ovarian cancer (EOC) were included in our study. The relative expression of miR-125b was measured using real-time polymerase chain reaction (RT-PCR).The protein expression of SET and EMT-related indicators in cell lines were assessed by Western blot. The regulation of SET by miR-125b was confirmed using luciferase reporter assays. The effect of miR-125b on metastasis was evaluated using an in vivo metastasis model.
Results:
miR-125b expression was markedly lower in the EOC specimens. Ectopic expression of miR-125b in EOC cells significantly inhibited tumor invasion.miR-125b expression was negatively associated with both EMT and SET expression, in vivo and in vitro. Mechanistic studies identified SET as a direct target of miR-125b, and the downregulation of SET, observed during tumor migration, was affected by the overexpression of miR125b.
Conclusion:
miR-125b suppresses EOC cell migration and invasion by targeting the SET protein, and this study may provide a novel mechanism for understanding the progression of EOC.
Insights
MicroRNA-125b (miR-125b) suppresses ovarian cancer cell migration and invasion by targeting the SET protein. This finding reveals a novel mechanism in epithelial ovarian carcinoma (EOC) progression.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- MicroRNA-125b (miR-125b) is implicated in various cancers, often linked to chemotherapy resistance.
- The specific role of miR-125b in epithelial ovarian carcinoma (EOC) and its association with epithelial-mesenchymal transition (EMT) were previously unknown.
Purpose of the Study:
- To investigate the relationship between miR-125b and EMT in epithelial ovarian carcinoma.
- To elucidate the mechanism by which miR-125b influences ovarian cancer progression.
Main Methods:
- Real-time polymerase chain reaction (RT-PCR) to quantify miR-125b expression in 55 EOC patients.
- Western blot analysis to assess protein expression of SET and EMT markers.
- Luciferase reporter assays and in vivo metastasis models to confirm regulatory interactions and functional effects.
Main Results:
- miR-125b expression was significantly lower in EOC specimens.
- Ectopic miR-125b expression inhibited EOC cell invasion and metastasis.
- miR-125b directly targets SET protein, negatively correlating with EMT markers both in vitro and in vivo.
Conclusions:
- miR-125b acts as a tumor suppressor in EOC by inhibiting cell migration and invasion.
- Targeting the SET protein by miR-125b presents a novel mechanism for understanding EOC progression and potential therapeutic strategies.
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