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Electromagnetic fields (GSM 1800) do not alter blood-brain barrier permeability to sucrose in models in vitro with high barrier tightness.

Bioelectromagnetics · 2005 · No effect · Low evidence

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No effectLow evidencePaper 5164

Across three in vitro BBB models with improved/high barrier tightness, sucrose permeation remained unaffected after exposure to a GSM 1800 field for up to 5 days at an average SAR of 0.3 W/kg. The study did not confirm previously reported EMF-related increase…

Study snapshot

PublicationBioelectromagnetics · 2005
Study typein_vitro
Reported directionNo effect
Evidence ratingLow

Abstract

We previously reported that electromagnetic fields (EMFs) [GSM 1800 standard (Global System for Mobile Communications, 1800 MHz)] increased sucrose permeation across the blood-brain barrier (BBB) in vitro. The cell culture model used in our previous study was comprised of rat astrocytes in coculture with porcine brain microvascular endothelial cells (PBECs). In this study, after optimization of cell culture conditions, distinctly improved barrier tightness was observed, accompanied by a loss of susceptibility to EMF-related effects on BBB permeability. Cell cultures were exposed for 1-5 days at an average specific absorption rate (SAR) of 0.3 W/kg in the identical exposure system as described before. To quantify barrier tightness, sucrose permeation across exposed PBEC was measured and compared to values of sham exposed cells and to a control group. Additionally, observations in the BBB coculture system were complemented by similar experiments using two other in vitro models, composed of PBEC monocultures with or without serum. These three models display distinctly higher barrier tightness than the previously used system. In all three BBB models, sucrose permeation across the cell layers remained unaffected by exposure to a GSM 1800 field for up to 5 days. We thus could not confirm enhanced permeability of the BBB in vitro after EMF exposure as reported before since the in vitro barrier tightness in these experiments is now more like that of the in vivo situation.

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
PopulationNot supplied
Sample sizeNot supplied
ExposureRF · 1800 MHz · 0.3 W/kg · 1–5 days
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Across three in vitro BBB models with improved/high barrier tightness, sucrose permeation remained unaffected after exposure to a GSM 1800 field for up to 5 days at an average SAR of 0.3 W/kg. The study did not confirm previously reported EMF-related increases in BBB permeability under earlier, less tight culture conditions.

Outcomes measured

  • Blood-brain barrier (BBB) permeability to sucrose (sucrose permeation across endothelial cell layers)
  • Barrier tightness (as quantified via sucrose permeation)

Limitations

  • In vitro models only (no in vivo data)
  • Sample size not reported in abstract
  • Exposure limited to GSM 1800 at average SAR 0.3 W/kg and duration up to 5 days
  • Findings may depend on specific cell culture conditions/barrier tightness and the particular exposure system used
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "mobile phone (GSM 1800)",
    "frequency_mhz": 1800,
    "sar_wkg": 0.3,
    "duration": "1–5 days"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Blood-brain barrier (BBB) permeability to sucrose (sucrose permeation across endothelial cell layers)",
    "Barrier tightness (as quantified via sucrose permeation)"
  ],
  "main_findings": "Across three in vitro BBB models with improved/high barrier tightness, sucrose permeation remained unaffected after exposure to a GSM 1800 field for up to 5 days at an average SAR of 0.3 W/kg. The study did not confirm previously reported EMF-related increases in BBB permeability under earlier, less tight culture conditions.",
  "effect_direction": "no_effect",
  "limitations": [
    "In vitro models only (no in vivo data)",
    "Sample size not reported in abstract",
    "Exposure limited to GSM 1800 at average SAR 0.3 W/kg and duration up to 5 days",
    "Findings may depend on specific cell culture conditions/barrier tightness and the particular exposure system used"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "GSM 1800",
    "1800 MHz",
    "RF-EMF",
    "blood-brain barrier",
    "BBB",
    "sucrose permeation",
    "permeability",
    "porcine brain microvascular endothelial cells",
    "PBEC",
    "astrocyte coculture",
    "in vitro",
    "SAR 0.3 W/kg"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.2,
      "reason": "Study addresses RF-EMF bioeffects relevant to health risk assessment discussions, though no policy content is described."
    }
  ]
}
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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.20123
PubMed: 16142784

Read the original paper →

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