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αS-SETMAR: Inducing Protective Chaos in Glioblastoma?
Sarah-Anne David1, Sara Benharrat1, Oriane Lié1
1Université de Tours, INSERM, Imaging Brain & Neuropsychiatry, iBraiN U1253, 37032 Tours, France.
Background/Objectives:
Glioblastoma remains the most aggressive and lethal form of brain cancer, with no effective cure to date. The molecular mechanisms sustaining its development and relentless proliferation are still not fully understood. SETMAR, a protein lysine methyltransferase involved in various DNA repair and chromatin processes, has been reported as dysregulated in several cancers, including glioblastoma. Interestingly, S-SETMAR, a shorter isoform of SETMAR, has been suggested to antagonize the oncogenic properties of the full-length protein. Here, we explored the cellular and molecular consequences of S-SETMAR overexpression in glioblastoma cells.
Methods:
We compared native glioblastoma cells (8MGBA) with a recombinant 8MGBA line stably over-expressing αS-SETMAR, a stable form of S-SETMAR, using complementary cellular and molecular approaches.
Results:
Overexpression of αS-SETMAR markedly prolonged the cell cycle duration (from 27 to 37 h), leading to a significant decrease in cell proliferation. Unexpectedly, αS-SETMAR triggered genomic alterations characterized by an increased DNA content and extensive chromosomal instability, including aneuploidy, chromoanasynthesis-like rearrangements, and tripolar mitoses. Moreover, αS-SETMAR-expressing cells displayed heightened sensitivity to stress conditions mimicking chemotherapy and radiotherapy, resulting in increased apoptosis.
Conclusions:
Our findings identify αS-SETMAR as a dual modulator of glioblastoma cell fate-simultaneously slowing proliferation and promoting chromosomal instability while enhancing vulnerability to genotoxic stress. These results suggest that αS-SETMAR could serve as both a prognostic marker and a potential therapeutic tool in glioblastoma management.
Insights
Overexpressing S-SETMAR in glioblastoma cells slows proliferation and increases chromosomal instability. This dual effect enhances sensitivity to genotoxic stress, suggesting S-SETMAR as a potential therapeutic target for brain cancer.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Glioblastoma is an aggressive brain cancer with poorly understood molecular drivers.
- SETMAR, a DNA repair protein, is dysregulated in glioblastoma.
- S-SETMAR, a shorter SETMAR isoform, may counteract oncogenic functions.
Purpose of the Study:
- To investigate the effects of S-SETMAR overexpression in glioblastoma cells.
- To explore the molecular and cellular consequences of S-SETMAR in brain cancer.
Main Methods:
- Compared native glioblastoma cells (8MGBA) with cells overexpressing αS-SETMAR.
- Utilized complementary cellular and molecular analyses.
Main Results:
- αS-SETMAR overexpression prolonged cell cycle and decreased proliferation.
- Induced genomic alterations: increased DNA content, aneuploidy, and chromosomal instability.
- Enhanced sensitivity to chemotherapy/radiotherapy mimics, increasing apoptosis.
Conclusions:
- αS-SETMAR dual-modulates glioblastoma: slows proliferation, promotes instability, and increases genotoxic stress vulnerability.
- Suggests αS-SETMAR as a prognostic marker and potential therapeutic strategy for glioblastoma.
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