Effects of radiofrequency radiation exposure on blood-brain barrier permeability in male and female rats

Electromagn Biol Med · 2011 · Mixed · Low evidence

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MixedLow evidencePaper 2436

Rats were exposed to 0.9 and 1.8 GHz continuous-wave RFR for 20 minutes (SARs 4.26 mW/kg and 1.46 mW/kg). Female rats showed no albumin extravasation after exposure, while male rats showed a significant increase in albumin in the brain compared with sham-expo…

Study snapshot

PublicationElectromagn Biol Med · 2011

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

During the last several decades, numerous studies have been performed aiming at the question of whether or not exposure to radiofrequency radiation (RFR) influences the permeability of the blood-brain barrier (BBB). The objective of this study was to investigate the effect of RFR on the permeability of BBB in male and female Wistar albino rats. Right brain, left brain, cerebellum, and total brain were analyzed separately in the study. Rats were exposed to 0.9 and 1.8 GHz continuous-wave (CW) RFR for 20 min (at SARs of 4.26 mW/kg and 1.46 mW/kg, respectively) while under anesthesia. Control rats were sham-exposed. Disruption of BBB integrity was detected spectrophotometrically using the Evans-blue dye, which has been used as a BBB tracer and is known to be bound to serum albumin. Right brain, left brain, cerebellum, and total brain were evaluated for BBB permeability. In female rats, no albumin extravasation was found in in the brain after RFR exposure. A significant increase in albumin was found in the brains of the RF-exposed male rats when compared to sham-exposed male brains. These results suggest that exposure to 0.9 and 1.8 GHz CW RFR at levels below the international limits can affect the vascular permeability in the brain of male rats. The possible risk of RFR exposure in humans is a major concern for the society. Thus, this topic should be investigated more thoroughly in the future.

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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 typeanimal

Effect directionmixed

PopulationMale and female Wistar albino rats (anesthetized)

Sample sizeNot supplied

ExposureRF · 20 min

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Blood-brain barrier (BBB) permeability
Albumin extravasation (Evans-blue dye tracer)

Limitations

Sample size not reported in abstract
Exposure source/setup details not described in abstract
Short, single exposure duration (20 min)
Animals were under anesthesia during exposure
Findings differ by sex; generalizability unclear

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "20 min"
  },
  "population": "Male and female Wistar albino rats (anesthetized)",
  "sample_size": null,
  "outcomes": [
    "Blood-brain barrier (BBB) permeability",
    "Albumin extravasation (Evans-blue dye tracer)"
  ],
  "main_findings": "Rats were exposed to 0.9 and 1.8 GHz continuous-wave RFR for 20 minutes (SARs 4.26 mW/kg and 1.46 mW/kg). Female rats showed no albumin extravasation after exposure, while male rats showed a significant increase in albumin in the brain compared with sham-exposed males, suggesting increased vascular/BBB permeability in males under these conditions.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Exposure source/setup details not described in abstract",
    "Short, single exposure duration (20 min)",
    "Animals were under anesthesia during exposure",
    "Findings differ by sex; generalizability unclear"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "radiofrequency radiation",
    "RFR",
    "blood-brain barrier",
    "BBB permeability",
    "Evans-blue dye",
    "albumin extravasation",
    "Wistar albino rats",
    "0.9 GHz",
    "1.8 GHz",
    "continuous-wave",
    "SAR"
  ],
  "suggested_hubs": [
    {
      "slug": "animal-studies",
      "weight": 0.9,
      "reason": "Experimental study in rats assessing BBB permeability after RF exposure."
    }
  ]
}

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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: 10.3109/15368378.2011.600167
PubMed: 22047463

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