RF Safe

900-MHz microwave radiation enhances gamma-ray adverse effects on SHG44 cells.

Journal of toxicology and environmental health. Part A · 2009 · Harm · Low evidence

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HarmLow evidencePaper 4952

In SHG44 cells, exposure to 900-MHz EMF increased gamma-ray-associated damage. EMF preexposure enhanced the gamma-ray-induced decrease in cell proliferation and increased apoptosis; combined EMF and gamma-ray exposure produced a synergistic stress response wi…

Study snapshot

PublicationJournal of toxicology and environmental health. Part A · 2009
Study typein_vitro
Reported directionHarm
Evidence ratingLow

Abstract

Mobile phones are widely used globally. However, the biological effects due to exposure to electromagnetic fields (EMF) produced by mobile phones are largely unknown. Environmental and occupational exposure of humans to gamma-rays is a biologically relevant phenomenon. Consequently studies were undertaken to examine the interactions between gamma-rays and EMF on human health. In this study, exposure to 900-MHz EMF expanded gamma-ray damage to SHG44 cells. Preexposure EMF enhanced the decrease in cell proliferation induced by gamma-ray irradiation and the rate of apoptosis. The combination of EMF and gamma-ray exposure resulted in a synergistic effect by triggering stress response, which increased reactive oxygen species, but the expression of hsp70 at both mRNA and protein levels remained unaltered. Data indicate that the adverse effects of gamma-rays on cellular functions are strengthened by EMF.

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 directionharm
PopulationSHG44 cells (human cell line)
Sample sizeNot supplied
ExposureRF · 900 MHz
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In SHG44 cells, exposure to 900-MHz EMF increased gamma-ray-associated damage. EMF preexposure enhanced the gamma-ray-induced decrease in cell proliferation and increased apoptosis; combined EMF and gamma-ray exposure produced a synergistic stress response with increased ROS, while hsp70 expression at mRNA and protein levels was unchanged.

Outcomes measured

  • gamma-ray-induced cell damage
  • cell proliferation
  • apoptosis
  • stress response
  • reactive oxygen species (ROS)
  • hsp70 expression (mRNA and protein)

Limitations

  • In vitro cell model; findings may not translate to humans
  • Exposure parameters beyond frequency (e.g., SAR, duration) not reported in the abstract
  • Sample size not reported in the abstract
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 900,
    "sar_wkg": null,
    "duration": null
  },
  "population": "SHG44 cells (human cell line)",
  "sample_size": null,
  "outcomes": [
    "gamma-ray-induced cell damage",
    "cell proliferation",
    "apoptosis",
    "stress response",
    "reactive oxygen species (ROS)",
    "hsp70 expression (mRNA and protein)"
  ],
  "main_findings": "In SHG44 cells, exposure to 900-MHz EMF increased gamma-ray-associated damage. EMF preexposure enhanced the gamma-ray-induced decrease in cell proliferation and increased apoptosis; combined EMF and gamma-ray exposure produced a synergistic stress response with increased ROS, while hsp70 expression at mRNA and protein levels was unchanged.",
  "effect_direction": "harm",
  "limitations": [
    "In vitro cell model; findings may not translate to humans",
    "Exposure parameters beyond frequency (e.g., SAR, duration) not reported in the abstract",
    "Sample size not reported in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "900 MHz",
    "RF EMF",
    "mobile phone",
    "gamma rays",
    "SHG44 cells",
    "apoptosis",
    "cell proliferation",
    "reactive oxygen species",
    "hsp70",
    "synergistic effect",
    "stress response"
  ],
  "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: 10.1080/15287390902841466
PubMed: 19492235

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