RF Safe

Radiofrequency (microwave) radiation exposure of mammalian cells during UV-induced DNA repair synthesis.

Radiation research · 1987 · No effect · Low evidence

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No effectLow evidencePaper 6223

In MRC-5 human fibroblasts, continuous-wave and pulsed-wave microwave-range RFR exposures (350, 850, and 1200 MHz) for 1–3 h at 37°C showed no effect on the rate of UV-induced DNA repair synthesis. Pulsed-wave exposures at 350 and 850 MHz with medium held at …

Study snapshot

PublicationRadiation research · 1987
Study typein_vitro
Reported directionNo effect
Evidence ratingLow

Abstract

The effect of continuous-wave (CW) and pulsed-wave (PW) radiofrequency radiation (RFR) in the microwave range on UV-induced DNA repair has been investigated in MRC-5 normal human diploid fibroblasts. RFR exposure at power densities of 1 (or 5) and 10 mW/cm2 gave a maximum specific absorption rate (SAR) (at 10 mW/cm2) of 0.39 +/- 0.15 W/kg for 350 MHz RFR, 4.5 +/- 3.0 W/kg for 850 MHz RFR, and 2.7 +/- 1.6 W/kg for 1.2 GHz RFR. RFR exposures for 1 to 3 h at 37 degrees C, in either continuous-wave or pulsed-wave modes, had no effect on the rate of repair replication label incorporated into preexisting UV-damaged DNA. RFR exposures (PW), with a constant medium temperature of 39 degrees C at 350 and 850 MHz during the repair period after UV damage, also had no effect. Assay for induction of repair synthesis by RFR exposure alone in non-UV irradiated cells was negative for the 350-, 850-, and 1200-MHz CW and PW RFR at 37 degrees C and the 350- and 850-MHz PW RFR at 39 degrees C. RFR does not induce DNA repair under these exposure conditions. In preliminary experiments--with the tissue culture medium maintained at 39 degrees C and RFR exposures (PW) at the frequencies of 350, 850, and 1200 MHz--no effect on incorporation of [3H]thymidine into DNA undergoing semiconservative synthesis was observed.

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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
PopulationMRC-5 normal human diploid fibroblasts (cell culture)
Sample sizeNot supplied
ExposureRF · 1 to 3 h
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In MRC-5 human fibroblasts, continuous-wave and pulsed-wave microwave-range RFR exposures (350, 850, and 1200 MHz) for 1–3 h at 37°C showed no effect on the rate of UV-induced DNA repair synthesis. Pulsed-wave exposures at 350 and 850 MHz with medium held at 39°C during the post-UV repair period also showed no effect. RFR exposure alone did not induce repair synthesis under the tested conditions, and preliminary experiments found no effect on semiconservative DNA synthesis ([3H]thymidine incorporation) at 39°C.

Outcomes measured

  • UV-induced DNA repair synthesis (repair replication label incorporation into UV-damaged DNA)
  • Induction of repair synthesis by RFR alone (non-UV irradiated cells)
  • [3H]thymidine incorporation into DNA undergoing semiconservative synthesis (preliminary experiments)

Limitations

  • Sample size not reported in abstract
  • Exposure source/setup not described beyond frequency, power density, SAR, and temperature
  • Some results described as preliminary (semiconservative DNA synthesis)
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "1 to 3 h"
  },
  "population": "MRC-5 normal human diploid fibroblasts (cell culture)",
  "sample_size": null,
  "outcomes": [
    "UV-induced DNA repair synthesis (repair replication label incorporation into UV-damaged DNA)",
    "Induction of repair synthesis by RFR alone (non-UV irradiated cells)",
    "[3H]thymidine incorporation into DNA undergoing semiconservative synthesis (preliminary experiments)"
  ],
  "main_findings": "In MRC-5 human fibroblasts, continuous-wave and pulsed-wave microwave-range RFR exposures (350, 850, and 1200 MHz) for 1–3 h at 37°C showed no effect on the rate of UV-induced DNA repair synthesis. Pulsed-wave exposures at 350 and 850 MHz with medium held at 39°C during the post-UV repair period also showed no effect. RFR exposure alone did not induce repair synthesis under the tested conditions, and preliminary experiments found no effect on semiconservative DNA synthesis ([3H]thymidine incorporation) at 39°C.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sample size not reported in abstract",
    "Exposure source/setup not described beyond frequency, power density, SAR, and temperature",
    "Some results described as preliminary (semiconservative DNA synthesis)"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency radiation",
    "microwave",
    "continuous-wave",
    "pulsed-wave",
    "MRC-5",
    "human fibroblasts",
    "UV-induced DNA repair",
    "repair synthesis",
    "specific absorption rate",
    "power density",
    "350 MHz",
    "850 MHz",
    "1200 MHz"
  ],
  "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: Not supplied
PubMed: 3575655

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