Spatial learning, monoamines and oxidative stress in rats exposed to 900 MHz electromagnetic field in combination with iron overload.

Behavioural brain research · 2014 · Mixed · Low evidence

← Research stream

MixedLow evidencePaper 4568

Study snapshot

PublicationBehavioural brain research · 2014

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

The increasing use of mobile phone technology over the last decade raises concerns about the impact of high frequency electromagnetic fields (EMF) on health. More recently, a link between EMF, iron overload in the brain and neurodegenerative disorders including Parkinson's and Alzheimer's diseases has been suggested. Co-exposure to EMF and brain iron overload may have a greater impact on brain tissues and cognitive processes than each treatment by itself. To examine this hypothesis, Long-Evans rats submitted to 900 MHz exposure or combined 900 MHz EMF and iron overload treatments were tested in various spatial learning tasks (navigation task in the Morris water maze, working memory task in the radial-arm maze, and object exploration task involving spatial and non spatial processing). Biogenic monoamines and metabolites (dopamine, serotonin) and oxidative stress were measured. Rats exposed to EMF were impaired in the object exploration task but not in the navigation and working memory tasks. They also showed alterations of monoamine content in several brain areas but mainly in the hippocampus. Rats that received combined treatment did not show greater behavioral and neurochemical deficits than EMF-exposed rats. None of the two treatments produced global oxidative stress. These results show that there is an impact of EMF on the brain and cognitive processes but this impact is revealed only in a task exploiting spontaneous exploratory activity. In contrast, there are no synergistic effects between EMF and a high content of iron in the brain.

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

PopulationLong-Evans rats

Sample sizeNot supplied

ExposureRF · 900 MHz

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Rats exposed to 900 MHz EMF were impaired in the object exploration task but not in Morris water maze navigation or radial-arm maze working memory tasks. EMF-exposed rats showed alterations of monoamine content in several brain areas, mainly the hippocampus. Combined EMF plus iron overload did not produce greater behavioral or neurochemical deficits than EMF alone, and neither treatment produced global oxidative stress.

Outcomes measured

Spatial learning performance (Morris water maze navigation task)
Working memory performance (radial-arm maze)
Object exploration task performance (spatial and non-spatial processing)
Brain monoamines and metabolites (dopamine, serotonin)
Oxidative stress (global)
Synergistic effects of EMF + brain iron overload

Limitations

Exposure duration and dosimetry (e.g., SAR) not reported in the abstract
Sample size not reported in the abstract
Details of the iron overload protocol not reported in the abstract
Oxidative stress assessment described only as 'global' in the abstract; specific biomarkers not provided

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 900,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Long-Evans rats",
  "sample_size": null,
  "outcomes": [
    "Spatial learning performance (Morris water maze navigation task)",
    "Working memory performance (radial-arm maze)",
    "Object exploration task performance (spatial and non-spatial processing)",
    "Brain monoamines and metabolites (dopamine, serotonin)",
    "Oxidative stress (global)",
    "Synergistic effects of EMF + brain iron overload"
  ],
  "main_findings": "Rats exposed to 900 MHz EMF were impaired in the object exploration task but not in Morris water maze navigation or radial-arm maze working memory tasks. EMF-exposed rats showed alterations of monoamine content in several brain areas, mainly the hippocampus. Combined EMF plus iron overload did not produce greater behavioral or neurochemical deficits than EMF alone, and neither treatment produced global oxidative stress.",
  "effect_direction": "mixed",
  "limitations": [
    "Exposure duration and dosimetry (e.g., SAR) not reported in the abstract",
    "Sample size not reported in the abstract",
    "Details of the iron overload protocol not reported in the abstract",
    "Oxidative stress assessment described only as 'global' in the abstract; specific biomarkers not provided"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "900 MHz",
    "RF-EMF",
    "rats",
    "iron overload",
    "spatial learning",
    "Morris water maze",
    "radial-arm maze",
    "object exploration",
    "dopamine",
    "serotonin",
    "monoamines",
    "hippocampus",
    "oxidative stress",
    "synergy"
  ],
  "suggested_hubs": [
    {
      "slug": "mobile-phones",
      "weight": 0.9,
      "reason": "Study uses 900 MHz exposure framed in context of mobile phone technology."
    },
    {
      "slug": "animal-studies",
      "weight": 0.85,
      "reason": "Long-Evans rat experiment assessing behavior and neurochemistry."
    }
  ]
}

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: 10.1016/j.bbr.2013.10.016
PubMed: 24144546

Read the original paper →

Related papers

← Back to the Research Library