Autoradiographic evaluation of electromagnetic field effects on serotonin (5HT1A) receptors in rat brain.

Biomedical sciences instrumentation · 2003 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 5277

Study snapshot

PublicationBiomedical sciences instrumentation · 2003

Study typeanimal

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Serotonin (5HT1A) is a chemical mediator of inflammation and the largest single neurotransmitter system of the brain. Its secretion and physiological actions mediate stress and pain, affecting both immune and nervous system functions through the hypothalamic-pituitary-adrenal axis. Serotonin receptor dysfunction is well-characterized in mental disturbances like depression and anxiety. Transcranial magnetic stimulation has been used therapeutically to treat refractory disorders like non-responsive depression and may act in part through its effect on 5HT1A receptors. Previously we have shown that in vitro, 5HT1A receptor binding to a radioactive agonist can be modulated by specific intensity and frequency electromagnetic fields (EMFs). In the present report we have used quantitative receptor autoradiography to evaluate 5HT1A receptor density in rat brain and the impact of pulsed EMF exposure on receptor binding in key brain regions. Rats used in this study had whole body exposures to either a geofield control or to pulsed EMFs to evaluate the treatment for chemically-induced tendinitis. Since the brains were exposed coincidentally as a consequence of the main experiment, we investigated the potential for EMF-induced changes in areas such as the hippocampus. This pilot study should provide a detailed understanding of magnetic field effects on stress-responsive brain regions and will lead to a more coordinated approach to the use of such modalities for therapeutic intervention in humans.

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 directionunclear

PopulationRats

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 62% · Peer reviewed: yes

Main findings

Outcomes measured

5HT1A (serotonin) receptor density in rat brain
5HT1A receptor binding (autoradiography) in key brain regions (e.g., hippocampus)

Limitations

Pilot study
Brains were exposed coincidentally as a consequence of the main experiment (tendinitis treatment), not as the primary target
No exposure parameters (e.g., intensity, frequency, duration) reported in the abstract
No quantitative results or direction of change reported in the abstract

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": null,
    "source": "pulsed EMF (whole-body exposure)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Rats",
  "sample_size": null,
  "outcomes": [
    "5HT1A (serotonin) receptor density in rat brain",
    "5HT1A receptor binding (autoradiography) in key brain regions (e.g., hippocampus)"
  ],
  "main_findings": null,
  "effect_direction": "unclear",
  "limitations": [
    "Pilot study",
    "Brains were exposed coincidentally as a consequence of the main experiment (tendinitis treatment), not as the primary target",
    "No exposure parameters (e.g., intensity, frequency, duration) reported in the abstract",
    "No quantitative results or direction of change reported in the abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.62,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "pulsed electromagnetic fields",
    "EMF",
    "serotonin",
    "5HT1A receptor",
    "receptor autoradiography",
    "rat brain",
    "hippocampus",
    "transcranial magnetic stimulation",
    "stress",
    "pain",
    "tendinitis"
  ],
  "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: Not supplied
PubMed: 12724937

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