Cited by 327Microtubule and mitosis dynamicsElectromagnetic Fields and Biological EffectsMicrobial Inactivation Methods

The DOI matches its Crossref record; 69 of the 70 references it cites were found in a registry or an index; none of the 30 sources its claims cite is checked for support yet.

Mitotic Spindle Disruption by Alternating Electric Fields Leads to Improper Chromosome Segregation and Mitotic Catastrophe in Cancer Cells

Open access

Abstract

Tumor Treating Fields (TTFields) are low intensity, intermediate frequency, alternating electric fields. TTFields are a unique anti-mitotic treatment modality delivered in a continuous, noninvasive manner to the region of a tumor. It was previously postulated that by exerting directional forces on highly polar intracellular elements during mitosis, TTFields could disrupt the normal assembly of spindle microtubules. However there is limited evidence directly linking TTFields to an effect on microtubules. Here we report that TTFields decrease the ratio between polymerized and total tubulin and prevent proper mitotic spindle assembly. The aberrant mitotic events induced by TTFields lead to abnormal chromosome segregation, cellular multinucleation and caspase dependent apoptosis of daughter cells. The effect of TTFields on cell viability and clonogenic survival substantially depends upon the cell division rate. We show that by extending the duration of exposure to TTFields, slowly dividing cells can be affected to a similar extent as rapidly dividing cells.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

TTFields (low-intensity, intermediate-frequency alternating electric fields) disrupt mitotic spindle microtubules, reduce polymerized tubulin, and cause chromosome missegregation, multinucleation, and caspase-dependent apoptosis in cancer cells. Treatment efficacy depends strongly on cell division rate, and extending exposure improves effects in slowly dividing cells.

Key findings

  • TTFields decreased the polymerized-to-total tubulin ratio in A2780 ovarian carcinoma cells after 48 h at 200 kHz (12.8% decrease, p = 0.021), and increased depolymerized tubulin under rapid-turnover conditions after trypsinization/re-plating (p = 0.011); no significant change was seen at the slower-turnover 30-h time point.
  • TTFields caused abnormal mitotic spindle geometry and multinucleation: in U-87 MG cells, abnormal cells with multiple nuclei/micronuclear structures increased from 2% to 8% after 72 h (P = 0.002), and in MSTO-211H mesothelioma cells from 1% to 18% after 150 kHz treatment (P < 0.0001).
  • In Fischer rats with intracranial F-98 glioma, 7 days of 200 kHz TTFields at 200 V/m reduced tumor volume fold increase by 41% (p = 0.05; n = 14 treated vs n = 13 control) and significantly reduced normal metaphase and anaphase figures (p < 0.001 for both).
  • Across ten solid-tumor cell lines, all showed reduced cell count and clonogenic survival after 72 h TTFields, but response did not correlate with model chromosome number; it did correlate with doubling time for cell count (Spearman r = 0.7939; p = 0.008) and clonogenic survival (r = 0.7212; p = 0.023). Longer exposure improved efficacy in A2780 (doubling time 18.7 h), U-87 MG (39 h), and AsPC-1 (54 h) cells.

Methods

  • In vitro: multiple human cancer cell lines (e.g., A2780, A549, MDA-MB-231, U-87 MG, HeLa, MSTO-211H, AsPC-1) were treated with TTFields using the inovitro system at 175 V/m and cell-type-specific optimal frequencies; in vivo: F-98 glioma cells were implanted intracranially in Fischer rats and treated with 200 kHz TTFields at 200 V/m for 7 days, with tumor volume assessed by MRI and mitotic figures by H&E.
  • Assays included confocal fluorescence microscopy of mitotic spindles, tubulin polymerization assays with Western blotting for α-tubulin, time-lapse video microscopy of HeLa cells expressing Tubulin-GFP, flow cytometry for cell cycle/Annexin V/PI/caspase activity, SKY and chromosome spreads, cell counts, clonogenic survival, and β-galactosidase senescence assays.
  • Statistics used one-way ANOVA with Tukey’s test unless otherwise stated, and Spearman rank correlation for doubling time versus cell count/clonogenic survival.

Limitations

  • Stated: whether TTFields directly interfere with tubulin subunit addition or destroy existing microtubules remains undetermined; higher-resolution studies are needed. The initial triggers of caspase-dependent apoptosis are not fully understood, and it remains unclear whether post-mitotic death is solely due to aneuploidy or also delayed damage from mitosis.
  • Stated: the authors lack a clear explanation for divergent cell fates after TTFields exposure, and future randomized clinical trials are needed to confirm whether extended treatment duration improves clinical outcomes.
  • Evident: most mechanistic data are from in vitro cancer cell lines, with only one rat glioma model; several results are reported as “data not shown,” and p53 status, SAC status, and apoptotic signaling differences are proposed but not resolved in this study.

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Integrity signals

Registry

Crossref · 10.1038/srep18046

Cites

69 of 69 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

0 of 30 cited sources checked · 0 supported · 0 flagged

Show all 60 claims

  • It may state two separate claims as one. 18
  • The quote only partly states this claim. 2
  • Probably not a substantial claim. 16
31 of 31
  • The authors state this as an assumption.

    Electric fields exert directional forces on polar intracellular elements such as organelles and macromolecules.

    “A commonality among these hypotheses is the assumption that electric fields exert directional forces on polar intracellular elements such as organelles and macromolecules.”
  • The authors state this as an assumption.

    The progeny of cells that succeeded in completing previous mitosis under TTFields treatment were further damaged on consecutive mitotic events as treatment duration was extended.

    “It is reasonable to assume that the progeny of cells which succeeded in completing previous mitosis under TTFields treatment were further damaged on the consecutive mitotic events as the treatment duration was extended.”
  • The authors state this as an assumption.

    The application of TTFields resembles a state in which constant drug concentration is delivered to the tumor.

    “In this context, the application of TTFields presumably resembles a state in which constant drug concentration is delivered to the tumor.”
3 of 3

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • HeLa treatment frequency falls outside the stated TTFields range

    Minor

    The HeLa time-lapse experiment says it used 150 Hz TTFields, whereas the paper defines TTFields as operating at 100-300 kHz. The stated experimental frequency is outside that range.

  • The claimed field intensity for all studies differs from the rat experiment

    Minor

    The paper says 175 V/m was used for all studies, but reports applying 200 V/m in the rat experiment.

2 of 2

Citations

Cites

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Show all 70 references

1 of the 70 references couldn’t be matched to a known paper.

Research works printed but not linked: 1

  1. Elson, E. Biologic effects of radiofrequency and microwave fields: in vivo and in vitro experimental results in The biomedical engineering handbook (ed. Bronzino, J. D. ) 1417–1423 (CRC Press, 1995).

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Items 101–200 of 326

Metadata

Authors
Giladi, M., Schneiderman, R. S., Voloshin, T., Porat, Y., Munster, M., Blat, R., Sherbo, S., Bomzon, Z., Urman, N., Itzhaki, A., Cahal, S., Shteingauz, A., Chaudhry, A., Kirson, E. D., Weinberg, U., & Palti, Y.
Corresponding author
Giladi, Moshe
Venue
Scientific Reports
Published
2015-12-11
Volume
5
Issue
1
Pages
18046-18046
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2196065821
Cited by
327
References
70
Citations by year
2026: 31 · 2025: 28 · 2024: 32 · 2023: 40 · 2022: 47 · 2021: 34 · 2020: 34 · 2019: 27 · 2018: 28 · 2017: 15 · 2016: 11
FWCI
9.58
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Electromagnetic Fields and Biological Effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Microbial Inactivation Methods
Keywords
tumor treating fields, AC electric field, mitotic spindle disruption, microtubule assembly, tubulin, chromosome segregation, mitotic catastrophe, multinucleation, caspase-dependent apoptosis, clonogenic survival, cell division rate, tumor cell viability
MeSH terms
Animals, Cell Survival, Electricity, Humans, Microtubules, Mitosis, Spindle Apparatus, Neoplasms, Rats, Inbred F344, Tubulin, Apoptosis, Chromosome Segregation, Cell Line, Tumor, Rats, MCF-7 Cells

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