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Updated: Sep 18, 2025
Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment
Published on: June 2, 2020
Small Extracellular Vesicles from Radioresistant H3K27M-Pediatric Diffuse Midline Glioma Cells Modulate Tumor
Viral D Oza1,2, Kenan A Flores1, Yelena Chernyavskaya1
1Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY, USA.
Abstract:
Pediatric diffuse midline gliomas with the Histone 3 lysine 27-to-methionine mutation (H3K27M-pDMG) are aggressive brain tumors characterized by intrinsic resistance to radiation therapy, the current standard of care. These tumors exhibit significant intratumoral heterogeneity, with distinct subclonal populations likely contributing to therapy resistance. Emerging evidence suggests that small extracellular vesicles (sEV) mediate oncogenic signaling within glioma stem cell populations, yet their role under radiation-induced stress remains poorly understood. In this study, we characterized sEV uptake dynamics among H3K27M-pDMG tumor cells, identified key sEV surface proteins, and demonstrated that sEVs derived from radioresistant (RR) H3K27M-pDMG cells confer radioprotective effects on radiosensitive tumor cells. Molecular profiling revealed that RR-sEVs carry proteins, microRNAs (miRNAs), and metabolites associated with glycolysis, oxidative phosphorylation, and DNA repair. Upon uptake, RR-sEVs reprogrammed recipient cells by altering gene expression and metabolic pathways, and enhancing DNA repair and survival following radiation exposure. These findings provide insights into the role of sEV-mediated intratumoral communication as a contributor to radiation resistance in H3K27M-pDMG and suggest potential therapeutic strategies to disrupt this process and enhance radiation efficacy.
Insights
Pediatric diffuse midline gliomas (H3K27M-pDMG) resist radiation therapy. Small extracellular vesicles (sEVs) from radioresistant tumors protect sensitive cells, suggesting sEVs drive H3K27M-pDMG radiation resistance.
Area of Science:
- Neuro-oncology
- Cancer biology
- Cellular communication
Background:
- Pediatric diffuse midline gliomas (H3K27M-pDMG) are aggressive brain tumors.
- H3K27M-pDMG exhibit intrinsic resistance to radiation therapy.
- Intratumoral heterogeneity and small extracellular vesicles (sEVs) may contribute to therapy resistance.
Purpose of the Study:
- Investigate the role of sEVs in H3K27M-pDMG radiation resistance.
- Characterize sEV uptake and identify key sEV surface proteins.
- Determine if sEVs from radioresistant cells confer protection to radiosensitive cells.
Main Methods:
- Characterized sEV uptake dynamics in H3K27M-pDMG cells.
- Identified key sEV surface proteins.
- Performed molecular profiling of sEVs (proteins, miRNAs, metabolites).
- Assessed gene expression, metabolic pathways, DNA repair, and survival post-radiation.
Main Results:
- sEVs from radioresistant H3K27M-pDMG cells protected radiosensitive cells from radiation.
- RR-sEVs carry cargo (proteins, miRNAs, metabolites) linked to glycolysis, oxidative phosphorylation, and DNA repair.
- Uptake of RR-sEVs reprogrammed recipient cells, enhancing survival and DNA repair post-radiation.
Conclusions:
- sEV-mediated communication contributes to radiation resistance in H3K27M-pDMG.
- RR-sEVs reprogram recipient cells to promote survival and DNA repair.
- Targeting sEV-mediated communication may enhance radiation therapy efficacy for H3K27M-pDMG.
