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Electromagnetic field-induced converse cell growth during a long-term observation.

International journal of radiation biology · 2013 · Mixed · Low evidence

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MixedLow evidencePaper 4591

Cultured human cancer cells (DU145 and Jurkat) exposed to a 60 Hz, 1 mT magnetic field for 3 days showed growth effects that were promotive or suppressive depending on the period. The period-dependent converse growth effect was reported as consistent across i…

Study snapshot

PublicationInternational journal of radiation biology · 2013
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

PURPOSE: Professional and public concern about the potential adverse effects of man-made electromagnetic fields (EMF) on the human body has dramatically expanded in recent years. Despite numerous attempts to investigate this issue, the long-standing challenge of reproducibility surrounding alternating EMF effects on human health remains unresolved. Our chief aim was to investigate a plausible mechanism for this phenomenon. MATERIALS AND METHODS: Growth of cultured human cancer cells, DU145 and Jurkat, exposed to power frequency magnetic field (MF) (60 Hz, 1 mT) for 3 days, was determined using a 2-(4-Iodophenyl)- 3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium (WST-1) assay and a trypan blue exclusion assay. This experiment was repeated at incubators long-term monitoring period up to 5.3 years. A periodogram analysis was performed to investigate periodic patterns in the MF and sham effects on cell growth. RESULTS: Unlike conventional assumptions, the MF effect on growth in both cell types was promotive or suppressive in a period-dependent manner. The converse cell growth induced by the MF was consistent in incubators, with little variation. CONCLUSIONS: Spatiotemporal evidence suggests that the period-dependent converse cell growth by the MF may contribute to the poor reproducibility and explain the adverse effects observed in previous experimental and epidemiological investigations. Additionally, the novel approach of this study may be applied to design features required to experimentally determine the effects of EMF on living organisms in a convincing manner.

Machine Enhanced Logic

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
PopulationNot supplied
Sample sizeNot supplied
ExposureELF · 6e-05 MHz · 3 days (repeated during long-term monitoring up to 5.3 years)
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Cultured human cancer cells (DU145 and Jurkat) exposed to a 60 Hz, 1 mT magnetic field for 3 days showed growth effects that were promotive or suppressive depending on the period. The period-dependent converse growth effect was reported as consistent across incubators with little variation during long-term monitoring up to 5.3 years.

Outcomes measured

  • Cell growth (DU145 and Jurkat)
  • WST-1 assay results
  • Trypan blue exclusion assay results
  • Periodicity/period-dependent patterns in MF and sham effects on cell growth

Limitations

  • In vitro study using cultured human cancer cell lines (DU145, Jurkat); generalizability to humans/health outcomes not established in abstract
  • Sample size and replication details not reported in abstract
  • Exposure conditions beyond frequency/intensity and 3-day duration not detailed in abstract
  • Mechanistic explanation remains suggestive; conclusions refer to plausibility rather than direct demonstration
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": "power frequency magnetic field",
    "frequency_mhz": 6e-05,
    "sar_wkg": null,
    "duration": "3 days (repeated during long-term monitoring up to 5.3 years)"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Cell growth (DU145 and Jurkat)",
    "WST-1 assay results",
    "Trypan blue exclusion assay results",
    "Periodicity/period-dependent patterns in MF and sham effects on cell growth"
  ],
  "main_findings": "Cultured human cancer cells (DU145 and Jurkat) exposed to a 60 Hz, 1 mT magnetic field for 3 days showed growth effects that were promotive or suppressive depending on the period. The period-dependent converse growth effect was reported as consistent across incubators with little variation during long-term monitoring up to 5.3 years.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro study using cultured human cancer cell lines (DU145, Jurkat); generalizability to humans/health outcomes not established in abstract",
    "Sample size and replication details not reported in abstract",
    "Exposure conditions beyond frequency/intensity and 3-day duration not detailed in abstract",
    "Mechanistic explanation remains suggestive; conclusions refer to plausibility rather than direct demonstration"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic fields",
    "ELF",
    "power frequency",
    "magnetic field",
    "60 Hz",
    "1 mT",
    "cell growth",
    "DU145",
    "Jurkat",
    "WST-1",
    "trypan blue",
    "periodogram analysis",
    "reproducibility",
    "period-dependent effects"
  ],
  "suggested_hubs": []
}
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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: 10.3109/09553002.2013.825063
PubMed: 23859432

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