Effect of extremely low frequency electromagnetic field parameters on the proliferation of human breast cancer.

Abstract

Extremely low-frequency electromagnetic field (ELF-EMF) exposures influence many biological systems. These effects are mainly related to the intensity, duration, frequency, and pattern of the ELF-EMF. Our intent was to characterize the effect of specific pulsed electromagnetic fields on the in vitro proliferation of MCF-7 adenocarcinoma and MDA-MB-231 breast cancer cell lines and one non-cancerous M10 breast epithelial cell line. The following four important parameters of ELF-EMF were examined: frequencies (7.83 ± 0.3, 23.49 ± 0.3, and 39.15 ± 0.3 Hz), flux density (0.5 and 1 mT), exposure duration (12, 24, and 48 h), and the exposure methodology (continuous exposure versus switching exposure). The viability of MDA-MB-231 cells exposed to the optimized ELF-EMF pattern (7.83 ± 0.3 Hz, 1 mT, and 6 h switching exposure) was 40.1%. By contrast, the optimized ELF-EMF parameters that were most cytotoxic to breast cancer MDA-MB-231 cells were not damaging to normal M10 cells. In vitro studies also showed that exposure of MDA-MB-231 cells to the optimized ELF-EMF pattern promoted Ca influx and resulted in apoptosis. These data confirm that exposure to this specific ELF-EMF pattern can influence cellular processes and inhibit cancer cell growth. The specific ELF-EMF pattern determined in this study may provide a potential anti-cancer treatment in the future.

AI evidence extraction

Main findings

Pulsed ELF-EMF parameters (frequency, flux density, duration, and exposure methodology) were evaluated for effects on in vitro proliferation/viability of MCF-7 and MDA-MB-231 breast cancer cells and M10 normal breast epithelial cells. An optimized switching exposure pattern (7.83 ± 0.3 Hz, 1 mT, 6 h switching exposure) reduced MDA-MB-231 cell viability to 40.1% and was reported as not damaging to M10 cells; in MDA-MB-231 cells it promoted Ca influx and resulted in apoptosis.

Outcomes measured

• Cell proliferation/viability
• Cytotoxicity to cancer vs normal cells
• Calcium (Ca) influx
• Apoptosis

Limitations

• In vitro cell-line study; findings may not translate to in vivo or clinical outcomes
• Sample size/replication and statistical details not provided in abstract
• Exposure source/device and detailed dosimetry beyond frequency/flux density not described in abstract

{
    "study_type": "in_vitro",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "12, 24, and 48 h (tested); optimized pattern included 6 h switching exposure"
    },
    "population": "Human breast cancer cell lines (MCF-7, MDA-MB-231) and non-cancerous breast epithelial cell line (M10) in vitro",
    "sample_size": null,
    "outcomes": [
        "Cell proliferation/viability",
        "Cytotoxicity to cancer vs normal cells",
        "Calcium (Ca) influx",
        "Apoptosis"
    ],
    "main_findings": "Pulsed ELF-EMF parameters (frequency, flux density, duration, and exposure methodology) were evaluated for effects on in vitro proliferation/viability of MCF-7 and MDA-MB-231 breast cancer cells and M10 normal breast epithelial cells. An optimized switching exposure pattern (7.83 ± 0.3 Hz, 1 mT, 6 h switching exposure) reduced MDA-MB-231 cell viability to 40.1% and was reported as not damaging to M10 cells; in MDA-MB-231 cells it promoted Ca influx and resulted in apoptosis.",
    "effect_direction": "benefit",
    "limitations": [
        "In vitro cell-line study; findings may not translate to in vivo or clinical outcomes",
        "Sample size/replication and statistical details not provided in abstract",
        "Exposure source/device and detailed dosimetry beyond frequency/flux density not described in abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "ELF-EMF",
        "pulsed electromagnetic field",
        "breast cancer",
        "MCF-7",
        "MDA-MB-231",
        "M10",
        "frequency",
        "flux density",
        "switching exposure",
        "cell viability",
        "calcium influx",
        "apoptosis"
    ],
    "suggested_hubs": []
}

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