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Updated: Jun 24, 2025
Characterization of Functionally Associated miRNAs in Glioblastoma and their Engineering into Artificial Clusters for Gene Therapy
Published on: October 4, 2019
A novel interplay between PRC2 and miR-3189 regulates epithelial-mesenchymal transition (EMT) via modulating COL6A2
Vikas Sharma1,2, Omkar Suhas Vinchure1,3, Garima Yadav1
1Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, New Delhi, India.
Abstract:
Recent studies have shed light on disrupted collagen signaling in Gliomas, yet the regulatory landscape remains largely unexplored. This study enquired into the role of polycomb repressive complex-2 (PRC2)-mediated H3K27me3 modification, a key epigenetic factor in glioma. Using in-house data, we identified miRNAs downregulated in glioblastoma (GBM) with the potential to regulate Collagen VI family genes. Notably, miR-3189 emerged as a prime PRC2 target. Its expression was significantly downregulated in Indian GBM patients as well as other glioma cohorts. Mechanistic insights, involving Luciferase assays, mutagenesis, and Western blot analysis, confirmed direct targeting of Collagen VI member COL6A2 by miR-3189-3p. Functional assays demonstrated that miR-3189-3p restrained GBM malignancy by inhibiting proliferation, migration, and epithelial-mesenchymal transition (EMT). Conversely, COL6A2 overexpressed in GBM patients, countered miR-3189, and promoted the malignant phenotype. Gene set enrichment analysis highlighted EMT enrichment in GBM patients with elevated COL6A2 expression, carrying prognostic implications. This study uncovers intricate interactions between two epigenetic regulators-H3K27me3 and miR-3189-working synergistically to modulate Collagen VI gene; thus, influencing the malignancy of GBM. Targeting this H3K27me3|miR-3189-3p|COL6A2 axis presents a potential therapeutic avenue against GBM.
Insights
This study reveals how epigenetic factor PRC2 and miR-3189 regulate Collagen VI in glioblastoma (GBM). Targeting this pathway may offer new GBM therapies.
Area of Science:
- Molecular Biology
- Epigenetics
- Oncology
Background:
- Disrupted collagen signaling is implicated in gliomas.
- The epigenetic regulation of this process, particularly by PRC2-mediated H3K27me3, is not well understood.
Purpose of the Study:
- To investigate the role of PRC2-mediated H3K27me3 in glioma.
- To identify miRNAs targeting Collagen VI family genes and their impact on glioblastoma (GBM) malignancy.
Main Methods:
- Analysis of in-house data to identify downregulated miRNAs in GBM.
- Luciferase assays, mutagenesis, and Western blot to confirm miRNA-target interactions.
- Functional assays (proliferation, migration, EMT) and Gene Set Enrichment Analysis (GSEA).
Main Results:
- miR-3189 was identified as a PRC2 target, significantly downregulated in GBM patients.
- miR-3189-3p directly targets COL6A2, inhibiting GBM proliferation, migration, and EMT.
- COL6A2 overexpression promotes GBM malignancy and is associated with EMT enrichment and poor prognosis.
Conclusions:
- The H3K27me3|miR-3189-3p|COL6A2 axis is a key regulator of GBM malignancy.
- This axis represents a potential therapeutic target for GBM treatment.
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