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Published on: August 2, 2024
MiR-125b targets BCL3 and suppresses ovarian cancer proliferation
Yi Guan1, Hailan Yao, Zhihong Zheng
1Department of Medical Genetics, China Medical University, Shenyang, China.
Abstract:
Micro-RNAs (miRNAs) important for post-transcriptional gene expression as negative regulators are endogenous 21- to 23-nucleotide noncoding RNAs. Many miRNAs are expressed in ovarian cancer (OC). In this study, we reported that miR-125b was underexpressed in human OC specimens. Ectopic expression of miR-125b in OC cells induced cell cycle arrest and led to reduction in proliferation and clonal formation. This inhibitory effect on OC cell growth was mediated by miR-125b inhibition of the translation of an mRNA encoding a proto-oncogene, BCL3. Furthermore, expression of miR-125b suppressed the tumor formation generated by injecting OC cells in nude mice. Our results suggest that aberrantly expressed miR-125b may contribute to OC development.
Insights
Micro-RNAs (miRNAs) are key gene regulators. This study found that reduced miR-125b levels in ovarian cancer (OC) promote tumor growth by increasing the proto-oncogene BCL3, suggesting miR-125b as a potential tumor suppressor.
Area of Science:
- Molecular Biology
- Genetics
- Oncology
Background:
- Micro-RNAs (miRNAs) are endogenous noncoding RNAs regulating gene expression post-transcriptionally.
- Aberrant miRNA expression is implicated in various cancers, including ovarian cancer (OC).
Purpose of the Study:
- To investigate the role of miR-125b in ovarian cancer development and progression.
- To identify the molecular mechanisms underlying miR-125b's function in OC cells.
Main Methods:
- Analysis of miR-125b expression levels in human OC specimens.
- Overexpression of miR-125b in OC cell lines to assess its effects on cell proliferation, cell cycle, and colony formation.
- Luciferase reporter assays to confirm BCL3 as a direct target of miR-125b.
- In vivo tumor formation assays in nude mice.
Main Results:
- miR-125b was found to be significantly underexpressed in human OC tissues compared to normal tissues.
- Ectopic expression of miR-125b inhibited OC cell proliferation, induced cell cycle arrest, and reduced clonal formation.
- miR-125b directly targeted and inhibited the translation of BCL3 mRNA, a proto-oncogene.
- Overexpression of miR-125b suppressed tumor growth in a xenograft mouse model.
Conclusions:
- Aberrant downregulation of miR-125b may contribute to ovarian cancer pathogenesis.
- miR-125b functions as a tumor suppressor in ovarian cancer by inhibiting BCL3 expression.
- Restoring miR-125b levels could be a potential therapeutic strategy for ovarian cancer.
