RF Safe

[Effects of GSM 1800 MHz radiofrequency electromagnetic fields on DNA damage in Chinese hamster lung cells].

Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine] · 2006 · Mixed · Low evidence

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MixedLow evidencePaper 5120

Compared with sham exposure, 24-hour exposure to GSM 1800 MHz RF EMF at SAR 3.0 W/kg was associated with a significantly higher percentage of gammaH2AX foci-positive cells, while 1-hour exposure was not significantly different from sham.

Study snapshot

PublicationZhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine] · 2006
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

OBJECTIVE: To study the effects of GSM 1800 MHz radiofrequency electromagnetic fields (RF EMF) on DNA damage in Chinese hamster lung (CHL) cells. METHODS: The cells were intermittently exposed or sham-exposed to GSM 1800 MHz RF EMF (5 minutes on/10 minutes off) at a special absorption rate (SAR) of 3.0 W/kg for 1 hour or 24 hours. Meanwhile, cells exposed to 2-acetylaminofluorene, a DNA damage agent, at a final concentration of 20 mg/L for 2 hours were used as positive control. After exposure, cells were fixed by using 4% paraformaldehyde and processed for phosphorylated form of H2AX (gammaH2AX) immunofluorescence measurement. The primary antibody used for immunofluorescence was mouse monoclonal antibody against gammaH2AX and the secondary antibody was fluorescein isothiocyanate (FITC)-conjugated goat anti-mouse IgG. Nuclei were counterstained with 4, 6-diamidino-2-phenylindole (DAPI). The gammaH2AX foci and nuclei were visualized with an Olympus AX70 fluorescent microscope. Image Pro-Plus software was used to count the gammaH2AX foci in each cell. For each exposure condition, at least 50 cells were selected to detect gammaH2AX foci. Cells were classified as positive when more than five foci were detected. The percentage of gammaH2AX foci positive cells was adopted as the index of DNA damage. RESULTS: The percentage of gammaH2AX foci positive cell of 1800 MHz RF EMF exposure for 24 hours (37.9 +/- 8.6)% or 2-acetylaminofluorene exposure (50.9 +/- 9.4)% was significantly higher compared with the sham-exposure (28.0 +/- 8.4)%. However, there was no significant difference between the sham-exposure and RF EMF exposure for 1 hour (31.8 +/- 8.7)%. CONCLUSION: 1800 MHz RF EMF (SAR, 3.0 W/kg) for 24 hours might induce DNA damage in CHL cells.

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
PopulationChinese hamster lung (CHL) cells
Sample sizeNot supplied
ExposureRF · 1800 MHz · 3 W/kg · 1 hour or 24 hours (intermittent 5 min on/10 min off)
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Compared with sham exposure, 24-hour exposure to GSM 1800 MHz RF EMF at SAR 3.0 W/kg was associated with a significantly higher percentage of gammaH2AX foci-positive cells, while 1-hour exposure was not significantly different from sham.

Outcomes measured

  • DNA damage (gammaH2AX foci; % gammaH2AX-positive cells)

Limitations

  • In vitro cell study; findings may not generalize to in vivo or humans
  • Sample size not clearly reported beyond 'at least 50 cells' per condition
  • Only one SAR level (3.0 W/kg) and limited exposure durations assessed
  • Single DNA damage marker (gammaH2AX) used as outcome
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 1800,
    "sar_wkg": 3,
    "duration": "1 hour or 24 hours (intermittent 5 min on/10 min off)"
  },
  "population": "Chinese hamster lung (CHL) cells",
  "sample_size": null,
  "outcomes": [
    "DNA damage (gammaH2AX foci; % gammaH2AX-positive cells)"
  ],
  "main_findings": "Compared with sham exposure, 24-hour exposure to GSM 1800 MHz RF EMF at SAR 3.0 W/kg was associated with a significantly higher percentage of gammaH2AX foci-positive cells, while 1-hour exposure was not significantly different from sham.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro cell study; findings may not generalize to in vivo or humans",
    "Sample size not clearly reported beyond 'at least 50 cells' per condition",
    "Only one SAR level (3.0 W/kg) and limited exposure durations assessed",
    "Single DNA damage marker (gammaH2AX) used as outcome"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "GSM",
    "1800 MHz",
    "RF EMF",
    "radiofrequency electromagnetic fields",
    "SAR 3.0 W/kg",
    "Chinese hamster lung cells",
    "CHL cells",
    "DNA damage",
    "gammaH2AX",
    "immunofluorescence"
  ],
  "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: 16836873

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