Acute exposure to 27.12 MHz radiofrequency electromagnetic field disrupts blood-brain barrier integrity via eNOS activation and occludin down-regulation.

Iranian journal of basic medical sciences · 2025 · Mixed · Low evidence

← Research stream

MixedLow evidencePaper 5863

30 min RF-EMF exposure (27.12 MHz) increased eNOS gene expression without evidence of oxidative stress or inflammation. Longer exposures (180 and 360 min) increased HIF-1α expression, decreased claudin-1 and occludin levels, and showed histopathological signs…

Study snapshot

PublicationIranian journal of basic medical sciences · 2025

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

OBJECTIVES: Controlled modulation of blood-brain barrier (BBB) permeability without inducing damage represents a promising strategy for enhancing central nervous system drug delivery. MATERIALS AND METHODS: This study investigated the effects of 27.12 MHz radiofrequency electromagnetic field (RF-EMF) exposure for 30, 180, and 360 min on BBB integrity in female Wistar rats (n=6 per group). Brain and cerebellar tissues were analyzed histologically and immunohistochemically (haptoglobin, CD31), and molecular analyses were performed for oxidative stress parameters (TAS, TOS, and OSI), inflammatory and hypoxia markers (IL-6 and HIF-1α), endothelial nitric oxide synthase (eNOS), and tight junction proteins (claudin-1 and occludin). RESULTS: RF-EMF exposure for 30 min significantly increased eNOS gene expression without triggering oxidative stress or inflammation. Longer exposures (180 and 360 min) resulted in increased HIF-1α expression, decreased levels of claudin-1 and occludin, and histopathological signs of hyperemia and edema, particularly in the cerebellar tissue. Notably, occludin expression decreased in all exposure groups, while eNOS was maximally up-regulated at 30 min. CONCLUSION: Thirty-minute RF-EMF exposure at 27.12 MHz transiently modulates BBB permeability via eNOS activation and occludin down-regulation without apparent tissue damage. These findings suggest that short-term RF-EMF application may serve as a non-invasive tool for targeted BBB modulation. Further studies are warranted to refine exposure parameters and assess translational potential in neuropharmacological applications.

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 typeanimal

Effect directionmixed

PopulationFemale Wistar rats

Sample size24

ExposureRF · 27.12 MHz · 30, 180, and 360 min

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Blood-brain barrier (BBB) integrity/permeability
Histopathology (hyperemia, edema) in brain and cerebellum
Immunohistochemistry markers (haptoglobin, CD31)
Oxidative stress parameters (TAS, TOS, OSI)
Inflammatory marker (IL-6)
Hypoxia marker (HIF-1α)
eNOS gene expression
Tight junction proteins (claudin-1, occludin)

Limitations

Exposure metric (e.g., SAR) not reported in abstract
Small group size (n=6 per group)
Animal study (female Wistar rats), limiting direct human generalizability
Exposure source/setup details not provided in abstract

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 27.12,
    "sar_wkg": null,
    "duration": "30, 180, and 360 min"
  },
  "population": "Female Wistar rats",
  "sample_size": 24,
  "outcomes": [
    "Blood-brain barrier (BBB) integrity/permeability",
    "Histopathology (hyperemia, edema) in brain and cerebellum",
    "Immunohistochemistry markers (haptoglobin, CD31)",
    "Oxidative stress parameters (TAS, TOS, OSI)",
    "Inflammatory marker (IL-6)",
    "Hypoxia marker (HIF-1α)",
    "eNOS gene expression",
    "Tight junction proteins (claudin-1, occludin)"
  ],
  "main_findings": "30 min RF-EMF exposure (27.12 MHz) increased eNOS gene expression without evidence of oxidative stress or inflammation. Longer exposures (180 and 360 min) increased HIF-1α expression, decreased claudin-1 and occludin levels, and showed histopathological signs of hyperemia and edema (noted particularly in cerebellum); occludin expression decreased in all exposure groups.",
  "effect_direction": "mixed",
  "limitations": [
    "Exposure metric (e.g., SAR) not reported in abstract",
    "Small group size (n=6 per group)",
    "Animal study (female Wistar rats), limiting direct human generalizability",
    "Exposure source/setup details not provided in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "27.12 MHz",
    "RF-EMF",
    "radiofrequency electromagnetic field",
    "blood-brain barrier",
    "BBB permeability",
    "eNOS",
    "occludin",
    "claudin-1",
    "HIF-1α",
    "oxidative stress",
    "IL-6",
    "cerebellum",
    "hyperemia",
    "edema"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

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: 10.22038/ijbms.2025.86952.18784
PubMed: 41586187

Read the original paper →

Related papers

← Back to the Research Library