RF Safe

High frequency electromagnetic fields (GSM signals) affect gene expression levels in tumor suppressor p53-deficient embryonic stem cells.

Bioelectromagnetics · 2004 · Mixed · Low evidence

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MixedLow evidencePaper 5228

Exposure to pulse-modulated EMF simulating GSM 1800 uplink (1.71 GHz) using the GSM-217 modulation scheme significantly upregulated hsp70 mRNA in p53-deficient differentiating ES cells, with a low and transient increase of c-jun, c-myc, and p21 in p53-deficie…

Study snapshot

PublicationBioelectromagnetics · 2004
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

Effects of electromagnetic fields (EMF) simulating exposure to the Global System for Mobile Communications (GSM) signals were studied using pluripotent embryonic stem (ES) cells in vitro. Wild-type ES cells and ES cells deficient for the tumor suppressor p53 were exposed to pulse modulated EMF at 1.71 GHz, lower end of the uplink band of GSM 1800, under standardized and controlled conditions, and transcripts of regulatory genes were analyzed during in vitro differentiation. Two dominant GSM modulation schemes (GSM-217 and GSM-Talk), which generate temporal changes between GSM-Basic (active during talking phases) and GSM-DTX (active during listening phases thus simulating a typical conversation), were applied to the cells at and below the basic safety limits for local exposures as defined for the general public by the International Commission on Nonionizing Radiation Protection (ICNIRP). GSM-217 EMF induced a significant upregulation of mRNA levels of the heat shock protein, hsp70 of p53-deficient ES cells differentiating in vitro, paralleled by a low and transient increase of c-jun, c-myc, and p21 levels in p53-deficient, but not in wild-type cells. No responses were observed in either cell type after EMF exposure to GSM-Talk applied at similar slot-averaged specific absorption rates (SAR), but at lower time-averaged SAR values. Cardiac differentiation and cell cycle characteristics were not affected in embryonic stem and embryonic carcinoma cells after exposure to GSM-217 EMF signals. Our data indicate that the genetic background determines cellular responses to GSM modulated EMF. Bioelectromagnetics 25:296-307, 2004.

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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
PopulationPluripotent embryonic stem (ES) cells in vitro (wild-type and p53-deficient); embryonic carcinoma cells also mentioned
Sample sizeNot supplied
ExposureRF · 1710 MHz
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Exposure to pulse-modulated EMF simulating GSM 1800 uplink (1.71 GHz) using the GSM-217 modulation scheme significantly upregulated hsp70 mRNA in p53-deficient differentiating ES cells, with a low and transient increase of c-jun, c-myc, and p21 in p53-deficient but not wild-type cells. No transcript responses were observed after GSM-Talk exposure at similar slot-averaged SAR but lower time-averaged SAR. Cardiac differentiation and cell cycle characteristics were not affected after GSM-217 exposure.

Outcomes measured

  • mRNA/transcript levels of regulatory genes during in vitro differentiation (including hsp70, c-jun, c-myc, p21)
  • cardiac differentiation
  • cell cycle characteristics

Limitations

  • In vitro study (cell culture), limiting direct inference to human health outcomes
  • Exposure duration not stated in the abstract
  • Specific SAR values not reported in the abstract (only described as at/below ICNIRP basic safety limits)
  • Gene expression changes observed only in p53-deficient cells and only for one modulation scheme (GSM-217), suggesting context-specific effects
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "mobile phone (GSM signal simulation)",
    "frequency_mhz": 1710,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Pluripotent embryonic stem (ES) cells in vitro (wild-type and p53-deficient); embryonic carcinoma cells also mentioned",
  "sample_size": null,
  "outcomes": [
    "mRNA/transcript levels of regulatory genes during in vitro differentiation (including hsp70, c-jun, c-myc, p21)",
    "cardiac differentiation",
    "cell cycle characteristics"
  ],
  "main_findings": "Exposure to pulse-modulated EMF simulating GSM 1800 uplink (1.71 GHz) using the GSM-217 modulation scheme significantly upregulated hsp70 mRNA in p53-deficient differentiating ES cells, with a low and transient increase of c-jun, c-myc, and p21 in p53-deficient but not wild-type cells. No transcript responses were observed after GSM-Talk exposure at similar slot-averaged SAR but lower time-averaged SAR. Cardiac differentiation and cell cycle characteristics were not affected after GSM-217 exposure.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro study (cell culture), limiting direct inference to human health outcomes",
    "Exposure duration not stated in the abstract",
    "Specific SAR values not reported in the abstract (only described as at/below ICNIRP basic safety limits)",
    "Gene expression changes observed only in p53-deficient cells and only for one modulation scheme (GSM-217), suggesting context-specific effects"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "GSM",
    "GSM 1800",
    "1.71 GHz",
    "pulse-modulated EMF",
    "GSM-217",
    "GSM-Talk",
    "GSM-DTX",
    "ICNIRP limits",
    "embryonic stem cells",
    "p53-deficient",
    "gene expression",
    "hsp70",
    "c-jun",
    "c-myc",
    "p21",
    "differentiation",
    "cell cycle"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.62,
      "reason": "Exposure described as applied at/below ICNIRP basic safety limits for the general public."
    }
  ]
}
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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.10199
PubMed: 15114639

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