Cited by 111Glioma Diagnosis and TreatmentElectromagnetic Fields and Biological EffectsUltrasound and Hyperthermia Applications

Biological activity of tumor-treating fields in preclinical glioma models

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Silginer, Manuela, Weller, Michael, Stupp, Roger, Roth, Patrick·2017·Cell Death & Disease

Abstract

Glioblastoma is the most common and aggressive form of intrinsic brain tumor with a very poor prognosis. Thus, novel therapeutic approaches are urgently needed. Tumor-treating fields (TTFields) may represent such a novel treatment option. The aim of this study was to investigate the effects of TTFields on glioma cells, as well as the functional characterization of the underlying mechanisms. Here, we assessed the anti-glioma activity of TTFields in several preclinical models. Applying TTFields resulted in the induction of cell death in a frequency- and intensity-dependent manner in long-term glioma cell lines, as well as glioma-initiating cells. Cell death occurred in the absence of caspase activation, but involved autophagy and necroptosis. Severe alterations in cell cycle progression and aberrant mitotic features, such as poly- and micronucleation, preceded the induction of cell death. Furthermore, exposure to TTFields led to reduced migration and invasion, which are both biological hallmarks of glioma cells. The combination of TTFields with irradiation or the alkylating agent, temozolomide (TMZ), resulted in additive or synergistic effects, and the O 6-methyl-guanine DNA methyltransferase status did not influence the efficacy of TTFields. Importantly, TMZ-resistant glioma cells were responsive to TTFields application, highlighting the clinical potential of this therapeutic approach. In summary, our results indicate that TTFields induce autophagy, as well as necroptosis and hamper the migration and invasiveness of glioma cells. These findings may allow for a more detailed clinical evaluation of TTFields beyond the clinical data available so far.

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Crossref · 10.1038/cddis.2017.171

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  1. Weller M, Wick W, Aldape K, Brada M, Berger M, Pfister SM et al. Glioma. Nat Rev Dis Primers 2015; 1: 15017. 27188790

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Authors
Silginer, M., Weller, M., Stupp, R., & Roth, P.
Affiliations
University of Zurich (CH)
Corresponding author
Roth, Patrick
Venue
Cell Death & Disease
Published
2017-04-20
Volume
8
Issue
4
Pages
e2753-e2753
ISSN
2041-4889 (ISSN-L)
OpenAlex
W2606398715
Cited by
111
References
33
Citations by year
2026: 9 · 2025: 6 · 2024: 11 · 2023: 14 · 2022: 16 · 2021: 15 · 2020: 16 · 2019: 10 · 2018: 14
FWCI
6.29
Type
journal article
Language
en
Open access
Locations
  • Cell Death and Disease (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Zurich Open Repository and Archive (University of Zurich) (acceptedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich) (submittedVersion, cc-by)
  • Zurich Open Repository and Archive (University of Zurich)
Funders
Novocure
Topics
  • Health Sciences › Medicine › Genetics › Glioma Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Electromagnetic Fields and Biological Effects
  • Physical Sciences › Engineering › Biomedical Engineering › Ultrasound and Hyperthermia Applications
Keywords
tumor treating fields, glioblastoma, glioma, glioma stem cells, autophagy, necroptosis, caspase-independent cell death, cell cycle arrest, micronucleation, cell migration, tumor invasion, temozolomide resistance, radiosensitization, O6-methylguanine-DNA methyltransferase, combination therapy
MeSH terms
Temozolomide, Brain Neoplasms, Cell Cycle, Cell Movement, Cell Survival, Dacarbazine, Glioma, Humans, Neoplasm Invasiveness, DNA Modification Methylases, Apoptosis, Caspases, Tumor Suppressor Proteins, DNA Repair Enzymes, Cell Line, Tumor

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