Effects of prolonged iron overload and low frequency electromagnetic exposure on spatial learning and memory in the young rat.

Neurobiology of learning and memory · 2009 · Mixed · Low evidence

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MixedLow evidencePaper 4961

Study snapshot

PublicationNeurobiology of learning and memory · 2009

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

Low-frequency electromagnetic fields (EMF) have been suggested to affect the brain via alterations of blood-brain barrier permeability to iron. Because of an immature blood-brain barrier, the young brain may be particularly vulnerable to EMF exposure. It is therefore possible that behavioral and neurotoxic effects resulting from EMF-induced iron excess in the brain would be greater in young adults. The objective of the present study was to investigate the interaction between low-frequency EMF and iron overload in young rats. In Experiment 1, we tested the effects of iron overload on spatial learning and memory. Iron treatment did not affect performance in a reference (Morris water maze) and a working memory task (8-arm radial maze). In contrast, detection of a spatial change in an object exploration task was impaired. These effects correlated with modifications of the serotoninergic metabolism. In Experiment 2, the combination of EMF exposure and iron overload was tested. As in Experiment 1, rats were not impaired in reference and working memory tasks but were mildly impaired in the detection of the spatial change. Overall, the results showed an effect of iron overload on spontaneous spatial memory processes. However, low-frequency EMF exposure did not potentiate the effects of iron overload in young rats.

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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

PopulationYoung rats

Sample sizeNot supplied

ExposureELF

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Iron overload did not affect performance in the Morris water maze or 8-arm radial maze, but impaired detection of a spatial change in an object exploration task, correlating with modifications of serotoninergic metabolism. In a second experiment, combined low-frequency EMF exposure and iron overload produced similar mild impairment in spatial change detection, and EMF exposure did not potentiate the effects of iron overload in young rats.

Outcomes measured

Spatial learning (Morris water maze)
Working memory (8-arm radial maze)
Detection of spatial change (object exploration task)
Serotoninergic metabolism (correlates)

Limitations

EMF exposure parameters (e.g., frequency, intensity, duration) not reported in the abstract
Sample size not reported in the abstract
Findings are from an animal model (young rats), limiting direct generalization to humans

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Young rats",
  "sample_size": null,
  "outcomes": [
    "Spatial learning (Morris water maze)",
    "Working memory (8-arm radial maze)",
    "Detection of spatial change (object exploration task)",
    "Serotoninergic metabolism (correlates)"
  ],
  "main_findings": "Iron overload did not affect performance in the Morris water maze or 8-arm radial maze, but impaired detection of a spatial change in an object exploration task, correlating with modifications of serotoninergic metabolism. In a second experiment, combined low-frequency EMF exposure and iron overload produced similar mild impairment in spatial change detection, and EMF exposure did not potentiate the effects of iron overload in young rats.",
  "effect_direction": "mixed",
  "limitations": [
    "EMF exposure parameters (e.g., frequency, intensity, duration) not reported in the abstract",
    "Sample size not reported in the abstract",
    "Findings are from an animal model (young rats), limiting direct generalization to humans"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "low-frequency electromagnetic fields",
    "ELF EMF",
    "iron overload",
    "blood-brain barrier",
    "spatial learning",
    "memory",
    "Morris water maze",
    "radial maze",
    "object exploration",
    "serotoninergic metabolism",
    "young rats"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.2,
      "reason": "Addresses low-frequency EMF biological effects relevant to exposure guidelines, though no policy discussion is included."
    }
  ]
}

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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.nlm.2009.04.002
PubMed: 19394433

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