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Single- and double-strand DNA breaks in rat brain cells after acute exposure to radiofrequency electromagnetic radiation

Int J Radiat Biol · 1996 · Harm · Low evidence

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HarmLow evidencePaper 6684

After acute 2-hour exposure to either pulsed or continuous-wave 2450 MHz radiofrequency radiation (whole-body average SAR 1.2 W/kg), an increase in both single- and double-strand DNA breaks in individual rat brain cells was observed at 4 hours post-exposure. …

Study snapshot

PublicationInt J Radiat Biol · 1996
Study typeanimal
Reported directionHarm
Evidence ratingLow

Abstract

We investigated the effects of acute (2-h) exposure to pulsed (2-micros pulse width, 500 pulses s(-1)) and continuous wave 2450-MHz radiofrequency electromagnetic radiation on DNA strand breaks in brain cells of rat. The spatial averaged power density of the radiation was 2mW/cm2, which produced a whole-body average-specific absorption rate of 1.2W/kg. Single- and double-strand DNA breaks in individual brain cells were measured at 4h post-exposure using a microgel electrophoresis assay. An increase in both types of DNA strand breaks was observed after exposure to either the pulsed or continuous-wave radiation, No significant difference was observed between the effects of the two forms of radiation. We speculate that these effects could result from a direct effect of radiofrequency electromagnetic energy on DNA molecules and/or impairment of DNA-damage repair mechanisms in brain cells. Our data further support the results of earlier in vitro and in vivo studies showing effects of radiofrequency electromagnetic radiation on DNA.

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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 typeanimal
Effect directionharm
PopulationRat brain cells (in vivo)
Sample sizeNot supplied
Exposuremicrowave · 2450 MHz · 1.2 W/kg · acute 2-h exposure; DNA assessed 4 h post-exposure
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

After acute 2-hour exposure to either pulsed or continuous-wave 2450 MHz radiofrequency radiation (whole-body average SAR 1.2 W/kg), an increase in both single- and double-strand DNA breaks in individual rat brain cells was observed at 4 hours post-exposure. No significant difference was observed between pulsed and continuous-wave exposures.

Outcomes measured

  • Single-strand DNA breaks in brain cells
  • Double-strand DNA breaks in brain cells

Limitations

  • Sample size not reported in abstract
  • Only acute exposure assessed; outcomes measured at a single post-exposure time point (4 h)
  • Mechanism is speculative in abstract
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 2450,
    "sar_wkg": 1.2,
    "duration": "acute 2-h exposure; DNA assessed 4 h post-exposure"
  },
  "population": "Rat brain cells (in vivo)",
  "sample_size": null,
  "outcomes": [
    "Single-strand DNA breaks in brain cells",
    "Double-strand DNA breaks in brain cells"
  ],
  "main_findings": "After acute 2-hour exposure to either pulsed or continuous-wave 2450 MHz radiofrequency radiation (whole-body average SAR 1.2 W/kg), an increase in both single- and double-strand DNA breaks in individual rat brain cells was observed at 4 hours post-exposure. No significant difference was observed between pulsed and continuous-wave exposures.",
  "effect_direction": "harm",
  "limitations": [
    "Sample size not reported in abstract",
    "Only acute exposure assessed; outcomes measured at a single post-exposure time point (4 h)",
    "Mechanism is speculative in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency",
    "microwave",
    "2450 MHz",
    "pulsed radiation",
    "continuous wave",
    "rat",
    "brain cells",
    "DNA strand breaks",
    "single-strand breaks",
    "double-strand breaks",
    "microgel electrophoresis assay",
    "SAR 1.2 W/kg"
  ],
  "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: 10.1080/095530096145814
PubMed: 8627134

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