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Neurophysiological Effects Induced in the Nervous Tissue by Low-Frequency, Pulsed Magnetic Fields

Author

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  • A. Wieraszko

    (The College of Staten Island/CUNY)

  • Z. Ahmed

    (The College of Staten Island/CUNY)

  • J. Armani

    (The College of Staten Island/CUNY)

  • N. Maqsood

    (The College of Staten Island/CUNY)

  • S. Philips

    (The College of Staten Island/CUNY)

  • H. Raja

    (The College of Staten Island/CUNY)

Abstract

Summary The influence of pulsed magnetic fields (PMF) on the properties of nervous tissue was investigated. Hippocampal slices or synaptosomes obtained from hippocampal tissue were used as model systems. The amplitude of potentials recorded in vitro from one of the hippocampal pathways (Schaffer collaterals that use glutamate as a neurotransmitter) was employed as a measure of the influence of magnetic fields on synaptic efficiency. The synaptic glutamate turnover and radioactive calcium accumulation were used as markers of the PMF influence on biochemistry of synaptic mechanisms. The exposure of hippocampal slices for 30 min to PMF amplified evoked potentials. While the frequency of 0.16 Hz exerted the strongest effect, lower (0.01, 0.07, 0.03 Hz) and higher (0.5 Hz) frequencies were much less effective. The enhancement of the neuronal excitability was correlated with significant increase in the neuronal spontaneous activity mediated by electrical synapses. The PMF-induced changes in the excitability of the tissue were accompanied by an increase in the synaptic turnover of glutamate. The release of radioactive D-Aspartate (a glutamate analog used as a marker for glutamate turnover) from the slices, and its uptake by synaptosomes were enhanced, and reduced respectively, following the stimulation with pulsed magnetic fields. The frequency which was the most efficient in amplification of evoked potentials (0.16 Hz) was also the most effective in the modulation of the release and uptake processes. The PMF-induced changes in neurotransmitter turnover coincided with an increase in 45Ca2+ accumulation observed in hippocampal slices exposed to PMF.

Suggested Citation

  • A. Wieraszko & Z. Ahmed & J. Armani & N. Maqsood & S. Philips & H. Raja, 2005. "Neurophysiological Effects Induced in the Nervous Tissue by Low-Frequency, Pulsed Magnetic Fields," Environment Systems and Decisions, Springer, vol. 25(2), pages 145-155, December.
    • Handle: RePEc:spr:envsyd:v:25:y:2005:i:2:d:10.1007_s10669-005-4277-7
    DOI: 10.1007/s10669-005-4277-7
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    References listed on IDEAS

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    1. Ferdinand A. Gul & Judy S. L. Tsui, 2004. "Introduction and overview," Palgrave Macmillan Books, in: The Governance of East Asian Corporations, chapter 1, pages 1-26, Palgrave Macmillan.
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