RF Safe

[GSM 1,800 MHz radiofrequency electromagnetic fields induced clustering of membrane surface receptors and interference by noise magnetic fields].

Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases · 2006 · Mixed · Low evidence

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MixedLow evidencePaper 5105

EGF receptor clustering was observed after exposure to 1,800 MHz RF EMF modulated at 217 Hz or 50 Hz at SARs 0.5–4.0 W/kg for 15 min, but not at 0.1 W/kg. No clustering was found after unmodulated RF EMF or 2 microT noise magnetic field alone, and superpositi…

Study snapshot

PublicationZhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases · 2006
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

OBJECTIVE: To investigate the possible effect of exposure to GSM 1,800 MHz radiofrequency electromagnetic fields (RF EMF) on epidermal growth factor (EGF) receptor and its possible interference by noise magnetic fields (MF). METHODS: Chinese hamster lung fibroblasts (CHL) were exposed to 1,800 MHz RF EMF (modulated by 217 Hz or 50 Hz, or unmodulated), 2 microT noise MF, and RF EMF combined with 2 microT noise MF for 15 min, respectively. The specific absorption rates (SARs) of RF EMF were 0.1, 0.5, 1.0, 2.0 and 4.0 W/kg. Commercial EGF (1 ng/ml) treatment was used as positive control. EGF receptors on the cell membrane were observed under a laser scanning confocal microscope after indirect immunofluorescence staining. RESULTS: EGF receptor clustering was induced after exposure to GSM 1,800 MHz RF EMF modulated by 217 Hz or 50 Hz MF at SARs of 0.5, 1.0, 2.0, 4.0 W/kg for 15 min as induced by 1 ng/ml EGF, but not at SAR of 0.1 W/kg. And no EGF receptor clustering was found in cells after exposure to unmodulated RF EMF or 2 microT noise MF. In addition, superposition of 2 microT noise MF could inhibit the EGF receptor clustering induced by GSM 1,800 MHz RF EMF. CONCLUSION: EGF receptor clustering in CHL cells can be induced by GSM 1,800 MHz RF EMF at the lowest SAR of 0.5 W/kg and inhibited by noise MF. The modulation of wave may play an important role in the inducement of receptor clustering after RF exposure.

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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 directionmixed
PopulationChinese hamster lung fibroblasts (CHL)
Sample sizeNot supplied
ExposureRF · 1800 MHz · 15 min
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

EGF receptor clustering was observed after exposure to 1,800 MHz RF EMF modulated at 217 Hz or 50 Hz at SARs 0.5–4.0 W/kg for 15 min, but not at 0.1 W/kg. No clustering was found after unmodulated RF EMF or 2 microT noise magnetic field alone, and superposition of 2 microT noise magnetic field inhibited RF-induced clustering.

Outcomes measured

  • EGF receptor clustering on cell membrane (immunofluorescence/confocal microscopy)

Limitations

  • In vitro cell model (CHL fibroblasts); generalizability to humans not addressed
  • Sample size and replication not reported in abstract
  • Outcome is a cellular/microscopy endpoint; no downstream functional or health outcomes reported
  • Exposure duration limited to 15 minutes
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 1800,
    "sar_wkg": null,
    "duration": "15 min"
  },
  "population": "Chinese hamster lung fibroblasts (CHL)",
  "sample_size": null,
  "outcomes": [
    "EGF receptor clustering on cell membrane (immunofluorescence/confocal microscopy)"
  ],
  "main_findings": "EGF receptor clustering was observed after exposure to 1,800 MHz RF EMF modulated at 217 Hz or 50 Hz at SARs 0.5–4.0 W/kg for 15 min, but not at 0.1 W/kg. No clustering was found after unmodulated RF EMF or 2 microT noise magnetic field alone, and superposition of 2 microT noise magnetic field inhibited RF-induced clustering.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro cell model (CHL fibroblasts); generalizability to humans not addressed",
    "Sample size and replication not reported in abstract",
    "Outcome is a cellular/microscopy endpoint; no downstream functional or health outcomes reported",
    "Exposure duration limited to 15 minutes"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "GSM",
    "1800 MHz",
    "radiofrequency electromagnetic fields",
    "RF EMF",
    "specific absorption rate",
    "SAR",
    "epidermal growth factor receptor",
    "EGF receptor",
    "receptor clustering",
    "noise magnetic field",
    "2 microT",
    "modulation",
    "217 Hz",
    "50 Hz",
    "Chinese hamster lung fibroblasts",
    "confocal microscopy",
    "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: 16978511

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