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Updated: May 21, 2025
Mouse Bladder Wall Injection
Published on: July 12, 2011
MiR-125b suppresses bladder Cancer cell growth and triggers apoptosis by regulating IL-6/IL-6R/STAT3 axis in vitro
Fang Lin1, Shaorun Hu1, Jinxiang Chen1
1Basic Medicine Research Innovation Center for cardiometabolic diseases, Ministry of Education; Laboratory for Cardiovascular Pharmacology, Department of Pharmacology, School of Pharmacy, Southwest Medical University, Luzhou, Sichuan, China; Municipal Key Laboratory of Thrombosis and Vascular Biology, Luzhou, Sichuan, China; Department of Pharmacy, The Second People's Hospital of Yibin, Yibin, Sichuan, China.
Abstract:
Bladder cancer (BLCA) is an aggressive malignancy characterized by limited therapeutic options and a poor prognosis. Research has indicated that abnormally expressed miRNAs play a significant role in the pathogenesis of BLCA, although the specific mechanisms remain unclear. MiR-125b plays a tumor suppressor role in a variety of cancers and affects the biological processes of cancer cells such as proliferation, invasion, migration and apoptosis by regulating different signaling pathways. Elucidation of the molecular mechanisms underlying miR-125b may provide clinical therapeutic strategies for bladder cancer. Here, miR-125b was downregulated whereas its targets IL-6R and STAT3 were upregulated in BLCA, as evidenced by bioinformatics analysis. Kaplan-Meier analysis confirmed that miR-125b serves as an independent prognostic factor linked to overall survival (OS) in patients with bladder cancer. Furthermore, overexpression of miR-125b significantly inhibited BLCA cell proliferation, migration, and invasion, while promoting apoptosis, as evidenced by an increased Bax/Bcl-2 ratio and activated cleaved caspase-3. Further investigations demonstrated that miR-125b directly targets and downregulates both IL-6R and STAT3. In a xenograft model, miR-125b overexpression effectively inhibited tumor growth in bladder cancer by blocking IL-6/IL-6R and STAT3 signaling pathways. Collectively, these findings broaden our understanding of the mechanism by which miR-125b acting as a BLCA suppressor in apoptotic regulation by targeting the IL-6/IL-6R/STAT3 signaling pathway, providing novel insights regarding the design of novel miRNA based therapeutic strategies against BLCA.
Insights
MicroRNA-125b (miR-125b) acts as a tumor suppressor in bladder cancer (BLCA) by inhibiting cell proliferation and invasion. Overexpression of miR-125b targets the IL-6/IL-6R/STAT3 pathway, offering potential therapeutic strategies for BLCA.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Bladder cancer (BLCA) is an aggressive malignancy with limited treatment options and poor prognosis.
- Aberrant microRNA (miRNA) expression is implicated in BLCA pathogenesis, but specific mechanisms are unclear.
- MiR-125b exhibits tumor-suppressive roles in various cancers, influencing cell proliferation, invasion, migration, and apoptosis.
Purpose of the Study:
- To elucidate the molecular mechanisms of miR-125b in bladder cancer.
- To investigate the role of miR-125b in regulating the IL-6/IL-6R/STAT3 signaling pathway in BLCA.
- To evaluate miR-125b as a potential prognostic factor and therapeutic target for BLCA.
Main Methods:
- Bioinformatics analysis to identify dysregulated miRNAs and their targets in BLCA.
- Kaplan-Meier analysis to assess the prognostic significance of miR-125b.
- In vitro experiments to evaluate the effects of miR-125b overexpression on BLCA cell behavior.
- Western blot analysis to confirm target protein expression.
- Xenograft models to assess tumor growth inhibition in vivo.
Main Results:
- MiR-125b was downregulated, while its targets IL-6 receptor (IL-6R) and STAT3 were upregulated in BLCA.
- MiR-125b overexpression suppressed BLCA cell proliferation, migration, and invasion, and induced apoptosis.
- MiR-125b directly targets and downregulates IL-6R and STAT3.
- Overexpression of miR-125b inhibited tumor growth in a xenograft model by blocking the IL-6/IL-6R/STAT3 pathway.
Conclusions:
- MiR-125b functions as a tumor suppressor in bladder cancer.
- The tumor-suppressive activity of miR-125b is mediated through the regulation of the IL-6/IL-6R/STAT3 signaling pathway.
- MiR-125b represents a promising therapeutic target for bladder cancer treatment.
