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Characterization of Functionally Associated miRNAs in Glioblastoma and their Engineering into Artificial Clusters for Gene Therapy
Published on: October 4, 2019
miR-133b inhibits glioma cell proliferation and invasion by targeting Sirt1
Chuntao Li1, Zhixiong Liu1, Kui Yang1
1Department of Neurosurgery, Xiangya Hospital of Central South University, Changsha, 410008 Hunan, China.
Abstract:
MicroRNAs (miRs) are a class of small non-coding RNAs that function as mediators of gene expression. Dysregulations of miRs have been implicated in the development and progression of glioma. In the present study, we investigated the role of miR-133b in mediating the proliferation and invasion of glioma cells, and the potential mechanism. Real-time RT-PCR results showed that miR-133b expression was significantly decreased in glioma tissues compared with normal brain tissues. Luciferase reporter assay further identified silent information regulator 1 (Sirt1) as a novel direct target of miR-133b in glioma U87 cells. Overexpression of miR-133b suppressed Sirt1 expression and reduced the proliferation and invasion of U87 cells, which could be partly rescued by forced expression of Sirt1. In addition, the Sirt1 mRNA level was significantly higher in glioma tissues than in normal brain tissues, and was inversely correlated with miR-133b level in glioma tissues. In summary, our study sheds light on the regulatory mechanism of miR-133b in glioma growth and metastasis via direct mediation of Sirt1 expression, and suggests that Sirt1 may serve as a potential therapeutic target for glioma.
Insights
MicroRNAs (miRs) regulate gene expression. This study shows reduced miR-133b in glioma, which targets Sirt1, inhibiting glioma cell proliferation and invasion, suggesting Sirt1 as a therapeutic target.
Area of Science:
- Molecular Biology
- Oncology
- Gene Regulation
Background:
- MicroRNAs (miRs) are key regulators of gene expression.
- Dysregulation of miRs is linked to glioma development and progression.
- Understanding miR roles in glioma is crucial for therapeutic strategies.
Purpose of the Study:
- To investigate the role of miR-133b in glioma cell proliferation and invasion.
- To elucidate the underlying molecular mechanism involving miR-133b.
- To identify potential therapeutic targets for glioma treatment.
Main Methods:
- Real-time RT-PCR to quantify miR-133b expression in glioma tissues.
- Luciferase reporter assay to identify direct targets of miR-133b.
- Cell culture experiments (U87 cells) to assess effects of miR-133b and Sirt1 manipulation.
Main Results:
- miR-133b expression was significantly decreased in glioma tissues compared to normal brain tissues.
- Silent information regulator 1 (Sirt1) was identified as a direct target of miR-133b.
- Overexpression of miR-133b suppressed Sirt1, reducing glioma cell proliferation and invasion, effects partially reversed by Sirt1 overexpression.
- Sirt1 mRNA levels were elevated in glioma tissues and inversely correlated with miR-133b levels.
Conclusions:
- miR-133b directly targets Sirt1, inhibiting glioma cell proliferation and invasion.
- The miR-133b/Sirt1 axis plays a critical role in glioma progression.
- Sirt1 represents a potential therapeutic target for glioma treatment.
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