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Updated: Apr 26, 2026
Isolation, Enrichment, and Maintenance of Medulloblastoma Stem Cells
Published on: September 1, 2010
miR-106b is overexpressed in medulloblastomas and interacts directly with PTEN
Kay Ka-Wai Li1, Tian Xia, Fanny Man Ting Ma
1Department of Anatomical and Cellular Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China; Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.
Aims:
MicroRNAs (miRNAs) are an abundant group of small non-coding RNAs that have been implicated in tumorigenesis. They regulate expression of target genes by complementary base pairing. The purposes of this study were to delineate miR-106b expression in medulloblastoma (MB) and to explore its functional contributions to MB pathogenesis.
Methods:
We analysed expression of miR-106b in 32 MB samples by quantitative RT-PCR. We applied gain- and loss-of-function strategies to delineate the functional roles of miR-106b in MB. Luciferase reporter assay was conducted to confirm target gene of miR-106b.
Results:
Expression of miR-106b was overexpressed in MB, and was significantly associated with its host gene MCM7 (P = 0.020). Transfection of miR-106b inhibitor in MB cell lines markedly reduced cell proliferation, migration and invasion potential, and tumour sphere formation. Cell cycle analysis indicated that miR-106b inhibition induced G1 arrest and apoptosis. The cell cycle regulators, p21 and cyclin D1, and apoptotic marker cleaved PARP were differentially expressed in miR-106b inhibitor-transfected cells. PTEN was identified as a direct target gene of miR-106b. Luciferase reporter assay confirmed miR-106b directly interacted with the 3' UTR of PTEN. We found miR-106b directly targeted PTEN at transcriptional and translational levels. Immunohistochemistry revealed a trend between PTEN and miR-106b in MB tumours (P = 0.07).
Conclusions:
These data suggested the upregulation of miR-106b in MB and the involvement of miR-106b in MB biology.
Insights
MicroRNA-106b (miR-106b) is upregulated in medulloblastoma (MB). Inhibiting miR-106b reduces MB cell proliferation and invasion, suggesting its role in MB pathogenesis.
Area of Science:
- Molecular Biology
- Oncology
- Gene Regulation
Background:
- MicroRNAs (miRNAs) are small non-coding RNAs crucial in gene regulation.
- Aberrant miRNA expression is linked to various cancers, including medulloblastoma (MB).
- Understanding specific miRNA roles in MB pathogenesis is vital for targeted therapies.
Purpose of the Study:
- To investigate the expression levels of miR-106b in medulloblastoma.
- To explore the functional significance of miR-106b in MB cell behavior and tumorigenesis.
- To identify direct target genes of miR-106b in MB.
Main Methods:
- Quantitative RT-PCR was used to analyze miR-106b expression in 32 MB samples.
- Gain- and loss-of-function experiments were performed in MB cell lines.
- Luciferase reporter assays were employed to validate direct miRNA-target interactions.
Main Results:
- miR-106b was significantly overexpressed in MB tissues and correlated with its host gene MCM7.
- Inhibition of miR-106b suppressed MB cell proliferation, migration, invasion, and sphere formation.
- miR-106b inhibition induced G1 cell cycle arrest and apoptosis, affecting p21, cyclin D1, and cleaved PARP.
- PTEN was identified as a direct transcriptional and translational target of miR-106b.
Conclusions:
- miR-106b is upregulated in medulloblastoma, contributing to its pathogenesis.
- Targeting miR-106b presents a potential therapeutic strategy for MB.
- PTEN acts as a direct downstream effector of miR-106b in MB.
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