Genotoxic effects of exposure to radiofrequency electromagnetic fields (RF-EMF) in cultured mammalian cells are not independently reproducible.

Mutation research · 2007 · No effect · Low evidence

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No effectLow evidencePaper 5086

Study snapshot

PublicationMutation research · 2007

Study typein_vitro

Reported directionNo effect

Evidence ratingLow

Abstract

Conflicting results have been published regarding the induction of genotoxic effects by exposure to radiofrequency electromagnetic fields (RF-EMF). Using the comet assay, the micronucleus test and the chromosome aberration test with human fibroblasts (ES1 cells), the EU-funded "REFLEX" project (Risk Evaluation of Potential Environmental Hazards From Low Energy Electromagnetic Field Exposure Using Sensitive in vitro Methods) reported clearly positive effects for various exposure conditions. Because of the ongoing discussion on the biological significance of the effects observed, it was the aim of the present study to independently repeat the results using the same cells, the same equipment and the same exposure conditions. We therefore exposed ES1 cells to RF-EMF (1800 MHz; SAR 2 W/kg, continuous wave with intermittent exposure) for different time periods and then performed the alkaline (pH>13) comet assay and the micronucleus test (MNT). For both tests, clearly negative results were obtained in independently repeated experiments. We also performed these experiments with V79 cells, a sensitive Chinese hamster cell line that is frequently used in genotoxicity testing, and also did not measure any genotoxic effect in the comet assay and the MNT. Appropriate measures of quality control were considered to exclude variations in the test performance, failure of the RF-EMF exposure or an evaluation bias. The reasons for the difference between the results reported by the REFLEX project and our experiments remain unclear.

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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 directionno_effect

PopulationCultured mammalian cells (human fibroblasts ES1; Chinese hamster V79)

Sample sizeNot supplied

ExposureRF · 1800 MHz · 2 W/kg · different time periods

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

ES1 human fibroblasts exposed to 1800 MHz RF-EMF at SAR 2 W/kg (continuous wave with intermittent exposure) showed clearly negative results in the alkaline comet assay and micronucleus test across independently repeated experiments. Similar experiments in V79 Chinese hamster cells also did not show genotoxic effects in the comet assay or micronucleus test; reasons for discrepancies with prior REFLEX project positive findings were unclear.

Outcomes measured

DNA damage (alkaline comet assay)
Micronuclei (micronucleus test)
Genotoxic effects

Limitations

Exposure duration/time periods not specified in the abstract
Sample sizes not reported in the abstract
Only comet assay and micronucleus test results are reported here (chromosome aberration test mentioned as used in REFLEX, not reported for this study)
Reasons for discrepancy with prior REFLEX findings remain unclear

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 1800,
    "sar_wkg": 2,
    "duration": "different time periods"
  },
  "population": "Cultured mammalian cells (human fibroblasts ES1; Chinese hamster V79)",
  "sample_size": null,
  "outcomes": [
    "DNA damage (alkaline comet assay)",
    "Micronuclei (micronucleus test)",
    "Genotoxic effects"
  ],
  "main_findings": "ES1 human fibroblasts exposed to 1800 MHz RF-EMF at SAR 2 W/kg (continuous wave with intermittent exposure) showed clearly negative results in the alkaline comet assay and micronucleus test across independently repeated experiments. Similar experiments in V79 Chinese hamster cells also did not show genotoxic effects in the comet assay or micronucleus test; reasons for discrepancies with prior REFLEX project positive findings were unclear.",
  "effect_direction": "no_effect",
  "limitations": [
    "Exposure duration/time periods not specified in the abstract",
    "Sample sizes not reported in the abstract",
    "Only comet assay and micronucleus test results are reported here (chromosome aberration test mentioned as used in REFLEX, not reported for this study)",
    "Reasons for discrepancy with prior REFLEX findings remain unclear"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "RF-EMF",
    "radiofrequency electromagnetic fields",
    "1800 MHz",
    "SAR 2 W/kg",
    "comet assay",
    "micronucleus test",
    "genotoxicity",
    "in vitro",
    "human fibroblasts",
    "V79 cells",
    "REFLEX project",
    "reproducibility"
  ],
  "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: 10.1016/j.mrgentox.2006.08.003
PubMed: 16997616

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