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Related Experiment Videos

Possible mechanisms by which extremely low frequency magnetic fields affect opioid function

F S Prato1, J J Carson, K P Ossenkopp

  • 1Department of Medical Biophysics, University of Western Ontario, London, Canada.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|June 1, 1995
PubMed
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Extremely low frequency (ELF) magnetic fields inhibit snail analgesia, but only at specific amplitude and frequency combinations. This resonance-like effect suggests a direct magnetic field detection mechanism is involved.

Area of Science:

  • Neuroscience
  • Biophysics
  • Environmental Health

Background:

  • Extremely low frequency (ELF) magnetic fields (< 300 Hz) are known to have biological effects.
  • The precise mechanism by which organisms sense or respond to ELF magnetic fields remains largely unidentified.
  • Opioid peptide-mediated antinociception (analgesia) in the land snail Cepaea nemoralis provides a model system to study these effects.

Purpose of the Study:

  • To investigate the specific frequency and amplitude dependencies of ELF magnetic fields on snail analgesia.
  • To explore whether the observed effects are consistent with direct magnetic field sensing mechanisms.
  • To evaluate proposed models for ELF magnetic field detection.

Main Methods:

  • Snails (Cepaea nemoralis) with augmented opioid activity were exposed to time-varying sinusoidal ELF magnetic fields.

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  • Magnetic field parameters, including peak amplitude (0-547 microT) and frequency (10-240 Hz), were systematically varied.
  • A parallel static magnetic field was applied, and its influence was also assessed.
  • Analgesia was measured by the latency of response to a thermal stimulus.

    • Main Results:

    • A nonlinear reduction in analgesia was observed when the amplitude of a 60 Hz magnetic field was varied.
    • Significant inhibitory effects on analgesia occurred at specific frequencies: 30-35 Hz, 60-90 Hz, and 120-240 Hz.
    • Inhibition was observed across nearly all tested amplitudes of the static magnetic field when time-varying field parameters were constant.
    • The results demonstrated a resonance-like dependence on amplitude and frequency.

    Conclusions:

    • The observed resonance-like effects suggest a direct magnetic field detection mechanism, rather than induced currents, is responsible for the biological response.
    • These findings provide crucial insights into how organisms may directly sense weak ELF magnetic fields.
    • The study contributes to understanding the biological interactions with environmental magnetic fields.