Human keratinocytes in culture exhibit no response when exposed to short duration, low amplitude, high frequency (900 MHz) electromagnetic fields in a reverberation chamber.

Bioelectromagnetics · 2011 · No effect · Low evidence

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No effectLow evidencePaper 3280

Study snapshot

PublicationBioelectromagnetics · 2011

Study typein_vitro

Reported directionNo effect

Evidence ratingLow

Abstract

We exposed normal human epidermal keratinocytes to short duration, high frequency, and low amplitude electromagnetic fields, similar to that used by mobile phone technologies. We paid particular attention to the control of the characteristics of the electromagnetic environment generated within a mode stirred reverberation chamber (statistical homogeneity and isotropy of the field and SAR distribution). Two non-thermal exposure conditions were tested on the epidermal cells: 10-min exposure with a field amplitude of 8 V/m, and 30 min with 41 V/m. Corresponding specific absorption rates ranged from 2.6 to 73 mW/kg (continuous wave, 900 MHz carrier frequency). We collected RNA from cells subjected to these conditions and used it for a large-scale microarray screening of over 47000 human genes. Under these conditions, exposure of keratinocytes to the electromagnetic field had little effect; only 20 genes displayed significant modulation. The expression ratios were very small (close to 1.5-fold change), and none of them were shared by the two tested conditions. Furthermore, those assayed using polymerase chain reaction did not display significant expression modulation (overall mean of the exposed samples: 1.20 ± 0.18). In conclusion, the data presented here show that cultured keratinocytes are not significantly affected by EMF exposure.

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 directionno_effect

PopulationNormal human epidermal keratinocytes in culture

Sample sizeNot supplied

ExposureRF · 900 MHz · 10 min (8 V/m) and 30 min (41 V/m); continuous wave

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Keratinocytes exposed to non-thermal 900 MHz fields (10 min at 8 V/m; 30 min at 41 V/m; SAR 2.6–73 mW/kg) showed little effect on gene expression: 20 genes were significantly modulated with small ratios (~1.5-fold) and none overlapped between exposure conditions. Genes assayed by PCR did not show significant expression modulation; authors conclude keratinocytes were not significantly affected under these conditions.

Outcomes measured

Gene expression (microarray screening of >47,000 genes)
Gene expression validation by PCR

Limitations

In vitro cell culture model (normal human epidermal keratinocytes)
Short-duration exposures (10 and 30 minutes)
Only two exposure conditions tested
Microarray findings showed small changes and lacked consistency across conditions; PCR validation did not confirm significant modulation
Sample size/replicates not reported in abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 900,
    "sar_wkg": null,
    "duration": "10 min (8 V/m) and 30 min (41 V/m); continuous wave"
  },
  "population": "Normal human epidermal keratinocytes in culture",
  "sample_size": null,
  "outcomes": [
    "Gene expression (microarray screening of >47,000 genes)",
    "Gene expression validation by PCR"
  ],
  "main_findings": "Keratinocytes exposed to non-thermal 900 MHz fields (10 min at 8 V/m; 30 min at 41 V/m; SAR 2.6–73 mW/kg) showed little effect on gene expression: 20 genes were significantly modulated with small ratios (~1.5-fold) and none overlapped between exposure conditions. Genes assayed by PCR did not show significant expression modulation; authors conclude keratinocytes were not significantly affected under these conditions.",
  "effect_direction": "no_effect",
  "limitations": [
    "In vitro cell culture model (normal human epidermal keratinocytes)",
    "Short-duration exposures (10 and 30 minutes)",
    "Only two exposure conditions tested",
    "Microarray findings showed small changes and lacked consistency across conditions; PCR validation did not confirm significant modulation",
    "Sample size/replicates not reported in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "keratinocytes",
    "in vitro",
    "RF-EMF",
    "900 MHz",
    "mobile phone",
    "reverberation chamber",
    "non-thermal exposure",
    "SAR",
    "microarray",
    "gene expression",
    "PCR"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phones-rf",
      "weight": 0.9,
      "reason": "Exposure described as similar to mobile phone technologies at 900 MHz with SAR reported."
    }
  ]
}

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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: 10.1002/bem.20641
PubMed: 21452360

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