Related Experiment Video
Updated: May 12, 2026
Tropomodulin 3 Overexpression as a Marker for Platinum Resistance and Immune Infiltration in Ovarian Cancer
Published on: August 2, 2024
Gain-of-function microRNA screens identify miR-193a regulating proliferation and apoptosis in epithelial ovarian
Haruo Nakano1, Yoji Yamada, Tatsuya Miyazawa
1Biologics Research Laboratories, Kyowa Hakko Kirin Co., Ltd., Machida-shi, Tokyo 194-8533, Japan.
Abstract:
MicroRNAs (miRNAs) are a small class of non‑coding RNAs that negatively regulate gene expression, and are considered as new therapeutic targets for treating cancer. In this study, we performed a gain-of-function screen using miRNA mimic library (319 miRNA species) to identify those affecting cell proliferation in human epithelial ovarian cancer cells (A2780). We discovered a number of miRNAs that increased or decreased the cell viability of A2780 cells. Pro-proliferative and anti-proliferative miRNAs include oncogenic miR-372 and miR-373, and tumor suppressive miR-124a, miR-7, miR-192 and miR-193a, respectively. We found that overexpression of miR-124a, miR-192, miR-193a and miR‑193b inhibited BrdU incorporation in A2780 cells, indicating that these miRNAs affected the cell cycle. Overexpression of miR‑193a and miR-193b induced an activation of caspase 3/7, and resulted in apoptotic cell death in A2780 cells. A genome‑wide gene expression analysis with miR-193a-transfected A2780 cells led to identification of ARHGAP19, CCND1, ERBB4, KRAS and MCL1 as potential miR-193a targets. We demonstrated that miR-193a decreased the amount of MCL1 protein by binding 3'UTR of its mRNA. Our study suggests the potential of miRNA screens to discover miRNAs as therapeutic tools to treat ovarian cancer.
Insights
MicroRNAs (miRNAs) are key regulators of gene expression and potential cancer therapeutics. This study identified specific miRNAs that modulate ovarian cancer cell proliferation and survival, highlighting their therapeutic potential.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- MicroRNAs (miRNAs) are non-coding RNAs that regulate gene expression and are emerging as therapeutic targets for cancer.
- Epithelial ovarian cancer remains a significant health challenge, necessitating novel therapeutic strategies.
Purpose of the Study:
- To identify microRNAs that influence cell proliferation and survival in human epithelial ovarian cancer cells (A2780).
- To explore the therapeutic potential of specific microRNAs in ovarian cancer treatment.
Main Methods:
- A gain-of-function screen was conducted using a miRNA mimic library (319 species) in A2780 cells.
- Cell viability, BrdU incorporation, caspase 3/7 activity, and genome-wide gene expression were analyzed.
- Potential miRNA targets were validated using mRNA and protein level analysis.
Main Results:
- Several miRNAs were identified that either increased or decreased A2780 cell viability.
- Oncogenic miRNAs (miR-372, miR-373) promoted proliferation, while tumor-suppressive miRNAs (miR-124a, miR-7, miR-192, miR-193a) inhibited it.
- miR-193a and miR-193b induced apoptosis and targeted genes including MCL1, which was validated at the protein level.
Conclusions:
- miRNA screening is a viable approach for discovering novel therapeutic targets in ovarian cancer.
- Specific miRNAs, such as miR-193a, demonstrate potential as therapeutic agents by inducing apoptosis and regulating key cancer-related genes.
Related Concept Videos
01:22MicroRNAs
01:22MicroRNAs