Long-term electromagnetic field treatment enhances brain mitochondrial function of both Alzheimer's transgenic mice and normal mice: a mechanism for electromagnetic field-induced cognitive benefit?

Neuroscience · 2011 · Benefit · Low evidence

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BenefitLow evidencePaper 4465

Study snapshot

PublicationNeuroscience · 2011

Study typeanimal

Reported directionBenefit

Evidence ratingLow

Abstract

We have recently reported that long-term exposure to high frequency electromagnetic field (EMF) treatment not only prevents or reverses cognitive impairment in Alzheimer's transgenic (Tg) mice, but also improves memory in normal mice. To elucidate the possible mechanism(s) for these EMF-induced cognitive benefits, brain mitochondrial function was evaluated in aged Tg mice and non-transgenic (NT) littermates following 1 month of daily EMF exposure. In Tg mice, EMF treatment enhanced brain mitochondrial function by 50-150% across six established measures, being greatest in cognitively-important brain areas (e.g. cerebral cortex and hippocampus). EMF treatment also increased brain mitochondrial function in normal aged mice, although the enhancement was not as robust and less widespread compared to that of Tg mice. The EMF-induced enhancement of brain mitochondrial function in Tg mice was accompanied by 5-10 fold increases in soluble Aβ1-40 within the same mitochondrial preparations. These increases in mitochondrial soluble amyloid-β peptide (Aβ) were apparently due to the ability of EMF treatment to disaggregate Aβ oligomers, which are believed to be the form of Aβ causative to mitochondrial dysfunction in Alzheimer's disease (AD). Finally, the EMF-induced mitochondrial enhancement in both Tg and normal mice occurred through non-thermal effects because brain temperatures were either stable or decreased during/after EMF treatment. These results collectively suggest that brain mitochondrial enhancement may be a primary mechanism through which EMF treatment provides cognitive benefit to both Tg and NT mice. Especially in the context that mitochondrial dysfunction is an early and prominent characteristic of Alzheimer's pathogenesis, EMF treatment could have profound value in the disease's prevention and treatment through intervention at the mitochondrial level.

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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 directionbenefit

PopulationAged Alzheimer's transgenic (Tg) mice and non-transgenic (NT) littermates (normal aged mice)

Sample sizeNot supplied

ExposureRF · 1 month of daily EMF exposure

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

After 1 month of daily high-frequency EMF exposure, Tg mice showed 50–150% enhancement in brain mitochondrial function across six measures, greatest in cerebral cortex and hippocampus. Normal aged mice also showed increased mitochondrial function, though less robust and less widespread. In Tg mice, mitochondrial function enhancement was accompanied by 5–10 fold increases in soluble Aβ1-40 in mitochondrial preparations, which the authors attribute to EMF-related disaggregation of Aβ oligomers; brain temperatures were stable or decreased, suggesting non-thermal effects.

Outcomes measured

Brain mitochondrial function (six established measures)
Mitochondrial soluble Aβ1-40 levels
Brain temperature (thermal vs non-thermal effects)

Limitations

Frequency and dosimetry (e.g., SAR) not reported in the abstract
Sample size not reported in the abstract
Animal model findings may not generalize to humans
Cognitive outcomes are referenced as previously reported rather than presented here

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "1 month of daily EMF exposure"
  },
  "population": "Aged Alzheimer's transgenic (Tg) mice and non-transgenic (NT) littermates (normal aged mice)",
  "sample_size": null,
  "outcomes": [
    "Brain mitochondrial function (six established measures)",
    "Mitochondrial soluble Aβ1-40 levels",
    "Brain temperature (thermal vs non-thermal effects)"
  ],
  "main_findings": "After 1 month of daily high-frequency EMF exposure, Tg mice showed 50–150% enhancement in brain mitochondrial function across six measures, greatest in cerebral cortex and hippocampus. Normal aged mice also showed increased mitochondrial function, though less robust and less widespread. In Tg mice, mitochondrial function enhancement was accompanied by 5–10 fold increases in soluble Aβ1-40 in mitochondrial preparations, which the authors attribute to EMF-related disaggregation of Aβ oligomers; brain temperatures were stable or decreased, suggesting non-thermal effects.",
  "effect_direction": "benefit",
  "limitations": [
    "Frequency and dosimetry (e.g., SAR) not reported in the abstract",
    "Sample size not reported in the abstract",
    "Animal model findings may not generalize to humans",
    "Cognitive outcomes are referenced as previously reported rather than presented here"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic field",
    "high frequency",
    "RF",
    "Alzheimer's disease",
    "transgenic mice",
    "mitochondria",
    "hippocampus",
    "cerebral cortex",
    "amyloid-beta",
    "Aβ1-40",
    "non-thermal effects",
    "brain temperature"
  ],
  "suggested_hubs": []
}

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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: 10.1016/j.neuroscience.2011.04.012
PubMed: 21514369

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