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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
MicroRNA-206 Inhibited the Progression of Glioblastoma Through BCL-2
Wenjiong Hao1,2, Wei Luo3, Mangmang Bai2
1Department of Neurosurgery, The First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, 710061, People's Republic of China.
Abstract:
Gliomas are the most common type of brain tumor and have a poor prognosis. MicroRNAs (miRNAs) are a class of small, endogenous, and non-coding RNAs that play crucial roles in cell proliferation, survival, and invasion. Deregulated expression of miR-206 has been investigated in many cancers. However, the role of miR-206 in glioblastoma is still unclear. In the present study, we found that the expression of miR-206 was decreased in cancer tissues compared with normal tissues. However, the expression level of BCL-2 was higher in cancer tissues than that in normal tissues (all p < 0.001). Statistically, the expression level of BCL-2 was inversely correlated with the miR-206. In addition, the overall survival of glioblastoma patients with lower miR-206 expression was significantly shorter than those with high miR-206 expression (p < 0.001). Besides, the expression of miR-206 was also decreased in U87 and U251 cells. In vitro assays showed that ectopic miR-206 expression affected the proliferation, cell cycle, and invasion in U87 and U251 cells. Importantly, we identified BCL-2 as a direct target of miR-206 in U87 and U251 cells using luciferase assay. Overexpression of BCL-2 partially attenuated the miR-206-mediated cell proliferation. In vivo, overexpression of miR-206 suppressed the progression of glioblastoma cells using mice xenograft model. In conclusion, this study suggested that miR-206 could act as a tumor suppressor gene through inhibiting BCL-2 in the development of glioblastoma.
Insights
MicroRNA-206 (miR-206) acts as a tumor suppressor in glioblastoma by inhibiting BCL-2. Lower miR-206 levels correlate with poor prognosis, while its overexpression suppresses tumor growth.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Gliomas, particularly glioblastoma, are aggressive brain tumors with poor outcomes.
- MicroRNAs (miRNAs) regulate critical cellular processes, and their dysregulation is implicated in cancer.
- The specific role of miR-206 in glioblastoma pathogenesis remained largely undefined.
Purpose of the Study:
- To investigate the expression and function of miR-206 in glioblastoma.
- To determine the relationship between miR-206, BCL-2, and patient survival.
- To elucidate the therapeutic potential of miR-206 in glioblastoma.
Main Methods:
- Quantitative analysis of miR-206 and BCL-2 expression in glioblastoma tissues and cell lines.
- In vitro functional assays (proliferation, cell cycle, invasion) following miR-206 manipulation.
- Luciferase reporter assays to confirm BCL-2 as a direct miR-206 target.
- In vivo studies using a mouse xenograft model.
Main Results:
- miR-206 expression was significantly decreased in glioblastoma tissues and cells compared to normal controls.
- BCL-2 expression was inversely correlated with miR-206 levels and positively correlated with tumor progression.
- Lower miR-206 expression was associated with shorter overall survival in glioblastoma patients.
- Overexpression of miR-206 inhibited glioblastoma cell proliferation, cell cycle progression, and invasion in vitro and suppressed tumor growth in vivo.
- BCL-2 was validated as a direct target of miR-206, and its overexpression partially rescued miR-206's anti-proliferative effects.
Conclusions:
- miR-206 functions as a tumor suppressor in glioblastoma.
- The tumor-suppressive role of miR-206 is mediated, at least in part, by the inhibition of its direct target, BCL-2.
- miR-206 represents a potential therapeutic target for glioblastoma treatment.
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