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Updated: Aug 9, 2025
Characterization of Functionally Associated miRNAs in Glioblastoma and their Engineering into Artificial Clusters for Gene Therapy
Published on: October 4, 2019
Identification of Dysregulated microRNAs in Glioblastoma Stem-like Cells
Lara Evers1, Agnes Schäfer1, Raffaella Pini2
1Department of Neurosurgery, Philipps-University Marburg, University Hospital Marburg (UKGM), Baldingerstrasse, 35043 Marburg, Germany.
Abstract:
Glioblastoma multiforme (GBM) is the most common malignant primary brain tumor in adults. Despite multimodal therapy, median survival is poor at 12-15 months. At the molecular level, radio-/chemoresistance and resulting tumor progression are attributed to a small fraction of tumor cells, termed glioblastoma stem-like cells (GSCs). These CD133-expressing, self-renewing cells display the properties of multi-lineage differentiation, resulting in the heterogenous composition of GBM. MicroRNAs (miRNAs) as regulators of gene expression at the post-transcriptional level can alter many pathways pivotal to cancer stem cell fate. This study explored changes in the miRNA expression profiles in patient-derived GSCs altered on differentiation into glial fiber acid protein (GFAP)-expressing, astrocytic tumor cells using a polymerase chain reaction (PCR) array. Initially, 22 miRNAs showed higher expression in GSCs and 9 miRNAs in differentiated cells. The two most downregulated miRNAs in differentiated GSCs were miR-17-5p and miR-425-5p, whilst the most upregulated miRNAs were miR-223-3p and let-7-5p. Among those, miR-425-5p showed the highest consistency in an upregulation in all three GSCs. By transfection of a 425-5p miRNA mimic, we demonstrated downregulation of the GFAP protein in differentiated patient-derived GBM cells, providing potential evidence for direct regulation of miRNAs in the GSC/GBM cell transition.
Insights
MicroRNAs regulate glioblastoma stem-like cells (GSCs). This study found miR-425-5p is upregulated in differentiated GSCs and may directly regulate glial fiber acid protein, impacting brain tumor progression.
Area of Science:
- Neuro-oncology
- Molecular biology
- Cancer stem cell research
Background:
- Glioblastoma multiforme (GBM) is an aggressive brain tumor with poor prognosis.
- Glioblastoma stem-like cells (GSCs) drive tumor heterogeneity and therapy resistance.
- MicroRNAs (miRNAs) are key regulators of gene expression and cancer stem cell properties.
Purpose of the Study:
- To investigate miRNA expression profile changes during GSC differentiation.
- To identify specific miRNAs involved in the transition from GSCs to astrocytic tumor cells.
- To explore the functional role of dysregulated miRNAs in GBM.
Main Methods:
- Utilized patient-derived GSCs and differentiated cells.
- Employed polymerase chain reaction (PCR) arrays for miRNA profiling.
- Performed miRNA mimic transfection to assess functional impact.
Main Results:
- Identified significant differences in miRNA expression between GSCs and differentiated cells.
- miR-425-5p was consistently upregulated in differentiated GSCs across multiple samples.
- Transfection with a miR-425-5p mimic downregulated glial fiber acid protein (GFAP) in differentiated GBM cells.
Conclusions:
- Specific miRNAs are dysregulated during GSC differentiation into astrocytic tumor cells.
- miR-425-5p may play a direct role in regulating GFAP expression, influencing GBM cell transition.
- These findings offer potential therapeutic targets for GBM treatment.
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