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

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.

AI evidence extraction

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

{
    "study_type": "animal",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": 2450,
        "sar_wkg": 1.1999999999999999555910790149937383830547332763671875,
        "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": 0.7800000000000000266453525910037569701671600341796875,
    "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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