The proliferation rates of HT-1080 human fibrosarcoma cells can be accelerated or inhibited by weak static and extremely low frequency magnetic fields

Frontiers in Public Health · 2025 · Mixed · Low evidence

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MixedLow evidencePaper 2621

Study snapshot

PublicationFrontiers in Public Health · 2025

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

Category: Cell Biology Tags: electromagnetic fields, cell proliferation, HT-1080, fibrosarcoma, static magnetic field, low frequency magnetic fields, bioenergetics DOI: 10.3389/fpubh.2025.1535155 URL: frontiersin.org Introduction Weak static and low-frequency magnetic fields (MFs) have been hypothesized to influence biological systems through mechanisms involving nuclear spin coupling. This study investigates how such fields modulate the proliferation of HT-1080 fibrosarcoma cells. Methods - HT-1080 cells were exposed in vitro for 4 days to weak MFs with a 10 μT amplitude and frequencies between 12 Hz and 33 Hz, superimposed on a 45 μT static background field. - Changes in cell growth, mitochondrial superoxide (O2-), calcium ion (Ca2+) concentrations, and membrane potential were measured. Results - MFs could either increase or decrease fibrosarcoma cell growth in a frequency- and amplitude-dependent manner. - Inversions in growth rates were observed near 16.5 Hz, where a 0.5 Hz shift or amplitude changes as small as 250 nT reversed effects relative to controls. - Reversing the static field direction also inverted growth outcomes. - Changes in membrane potential, Ca2+, and mitochondrial superoxide levels supported a role for bioenergetic modulation. Discussion These findings suggest that weak MFs affect cell proliferation through spin-dependent chemical reaction rate changes. The pronounced sensitivity of fibrosarcoma cells compared to normal fibroblasts points to potential therapeutic applications via selective MF-based modulation.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro

Effect directionmixed

PopulationHT-1080 human fibrosarcoma cells (in vitro)

Sample sizeNot supplied

ExposureELF · 4 days

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

HT-1080 fibrosarcoma cells exposed for 4 days to weak magnetic fields (10 μT; 12–33 Hz) superimposed on a 45 μT static background showed frequency- and amplitude-dependent changes in growth, with effects that could be either increased or decreased relative to controls. Growth-rate inversions were reported near 16.5 Hz with small frequency shifts (0.5 Hz) or amplitude changes (~250 nT), and reversing the static field direction also inverted growth outcomes; accompanying changes in membrane potential, Ca2+, and mitochondrial superoxide were reported.

Outcomes measured

cell proliferation/growth
mitochondrial superoxide (O2-)
intracellular calcium (Ca2+) concentration
membrane potential

Limitations

In vitro cell-line study; findings may not generalize to humans or in vivo conditions
Sample size and replication details not provided in the abstract
Exposure characterization beyond stated amplitudes/frequencies (e.g., field uniformity, dosimetry details) not provided in the abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "4 days"
  },
  "population": "HT-1080 human fibrosarcoma cells (in vitro)",
  "sample_size": null,
  "outcomes": [
    "cell proliferation/growth",
    "mitochondrial superoxide (O2-)",
    "intracellular calcium (Ca2+) concentration",
    "membrane potential"
  ],
  "main_findings": "HT-1080 fibrosarcoma cells exposed for 4 days to weak magnetic fields (10 μT; 12–33 Hz) superimposed on a 45 μT static background showed frequency- and amplitude-dependent changes in growth, with effects that could be either increased or decreased relative to controls. Growth-rate inversions were reported near 16.5 Hz with small frequency shifts (0.5 Hz) or amplitude changes (~250 nT), and reversing the static field direction also inverted growth outcomes; accompanying changes in membrane potential, Ca2+, and mitochondrial superoxide were reported.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro cell-line study; findings may not generalize to humans or in vivo conditions",
    "Sample size and replication details not provided in the abstract",
    "Exposure characterization beyond stated amplitudes/frequencies (e.g., field uniformity, dosimetry details) not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic fields",
    "magnetic fields",
    "static magnetic field",
    "extremely low frequency",
    "ELF",
    "cell proliferation",
    "HT-1080",
    "fibrosarcoma",
    "bioenergetics",
    "mitochondrial superoxide",
    "calcium",
    "membrane potential"
  ],
  "suggested_hubs": [
    {
      "slug": "elf-emf",
      "weight": 0.9,
      "reason": "Study examines extremely low frequency magnetic fields (12–33 Hz) and biological effects."
    },
    {
      "slug": "static-magnetic-fields",
      "weight": 0.75,
      "reason": "Exposure includes a 45 μT static background field and tests static field direction reversal."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.3389/fpubh.2025.1535155
PubMed: Not supplied

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