RF Safe

8-oxoG DNA glycosylase-1 inhibition sensitizes Neuro-2a cells to oxidative DNA base damage induced by 900 MHz radiofrequency electromagnetic radiation.

Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology · 2015 · Mixed · Low evidence

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MixedLow evidencePaper 4743

Neuro-2a cells exposed to 900 MHz GSM talk signals for 24 h showed increased oxidative DNA base damage accompanied by increased ROS. Without OGG1 siRNA, oxidative base damage was observed at 2 W/kg; with OGG1 siRNA, base damage was observed at 1 W/kg. No DNA …

Study snapshot

PublicationCellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology · 2015
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

BACKGROUND/AIMS: The purpose of this study was to explore the in vitro putative genotoxicity during exposure of Neuro-2a cells to radiofrequency electromagnetic fields (RF-EMFs) with or without silencing of 8-oxoG DNA glycosylase-1 (OGG1). METHODS: Neuro-2a cells treated with or without OGG1 siRNA were exposed to 900 MHz Global System for Mobile Communication (GSM) Talk signals continuously at a specific absorption rate (SAR) of 0, 0.5, 1 or 2 W/kg for 24 h. DNA strand breakage and DNA base damage were measured by the alkaline comet assay and a modified comet assay using formamidopyrimidine DNA glycosylase (FPG), respectively. Reactive oxygen species (ROS) levels and cell viability were monitored using the non-fluorescent probe 2, 7-dichlorofluorescein diacetate (DCFH-DA) and CCK-8 assay. RESULTS: Exposure to 900 MHz RF-EMFs with insufficient energy could induce oxidative DNA base damage in Neuro-2a cells. These increases were concomitant with similar increases in the generation of reactive oxygen species (ROS). Without OGG1 siRNA, 2 W/kg RF-EMFs induced oxidative DNA base damage in Neuro-2a cells. Interestingly, with OGG1 siRNA, RF-EMFs could cause DNA base damage in Neuro-2a cells as low as 1 W/kg. However, neither DNA strand breakage nor altered cell viability was observed. CONCLUSION: Even if further studies remain conducted we support the hypothesis that OGG1 is involved in the process of DNA base repair and may play a pivotal role in protecting DNA bases from RF-EMF induced oxidative damage.

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
PopulationNeuro-2a cells (mouse neuroblastoma cell line)
Sample sizeNot supplied
ExposureRF · 900 MHz · 24 h continuous
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Neuro-2a cells exposed to 900 MHz GSM talk signals for 24 h showed increased oxidative DNA base damage accompanied by increased ROS. Without OGG1 siRNA, oxidative base damage was observed at 2 W/kg; with OGG1 siRNA, base damage was observed at 1 W/kg. No DNA strand breakage or changes in cell viability were observed.

Outcomes measured

  • Oxidative DNA base damage (FPG-modified comet assay)
  • DNA strand breakage (alkaline comet assay)
  • Reactive oxygen species (ROS) levels (DCFH-DA)
  • Cell viability (CCK-8 assay)

Limitations

  • In vitro cell-line study; findings may not generalize to in vivo conditions
  • Sample size not reported in abstract
  • Exposure conditions limited to 24 h and SAR levels 0–2 W/kg
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 900,
    "sar_wkg": null,
    "duration": "24 h continuous"
  },
  "population": "Neuro-2a cells (mouse neuroblastoma cell line)",
  "sample_size": null,
  "outcomes": [
    "Oxidative DNA base damage (FPG-modified comet assay)",
    "DNA strand breakage (alkaline comet assay)",
    "Reactive oxygen species (ROS) levels (DCFH-DA)",
    "Cell viability (CCK-8 assay)"
  ],
  "main_findings": "Neuro-2a cells exposed to 900 MHz GSM talk signals for 24 h showed increased oxidative DNA base damage accompanied by increased ROS. Without OGG1 siRNA, oxidative base damage was observed at 2 W/kg; with OGG1 siRNA, base damage was observed at 1 W/kg. No DNA strand breakage or changes in cell viability were observed.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro cell-line study; findings may not generalize to in vivo conditions",
    "Sample size not reported in abstract",
    "Exposure conditions limited to 24 h and SAR levels 0–2 W/kg"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "900 MHz",
    "GSM",
    "radiofrequency electromagnetic fields",
    "RF-EMF",
    "Neuro-2a",
    "OGG1",
    "siRNA",
    "oxidative DNA base damage",
    "FPG-modified comet assay",
    "ROS",
    "cell viability"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phones-rf",
      "weight": 0.9,
      "reason": "Exposure described as 900 MHz GSM talk signals (mobile phone RF)."
    }
  ]
}
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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: 10.1159/000430233
PubMed: 26401913

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