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Related Experiment Videos

Mechanisms of electrical coupling between pyramidal cells

E J Vigmond1, J L Perez Velazquez, T A Valiante

  • 1Institute of Biomedical Engineering and Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S 3G9, Canada.

Journal of Neurophysiology
|February 7, 1998
PubMed
Summary

Electrical coupling in neurons involves gap junctions and extracellular fields. This study suggests that observed neuronal spikelets in vitro are likely caused by synchronized extracellular electric fields from multiple neurons, not gap junctions.

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Biophysics

Background:

  • Direct electrical coupling between neurons occurs via gap junctions and extracellular fields.
  • Intracellular recordings in rat hippocampal CA1 pyramidal neurons reveal distinct coupling potentials: short-duration spikelets and long-duration monophasic potentials.
  • Understanding the mechanisms of neuronal electrical coupling is crucial for deciphering neural circuit function.

Purpose of the Study:

  • To model and differentiate the contributions of gap junctional and extracellular electric field coupling to neuronal potentials.
  • To investigate the generation of spikelets and other coupling potentials in CA1 pyramidal neurons.
  • To assess the accuracy of intracellular electrode measurements in the presence of extracellular fields.

Main Methods:

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  • Developed a 3D morphological model of a pyramidal neuron.
  • Utilized a novel boundary element method formulation with triangular and cylindrical elements for computations.
  • Compared simulation results with in vitro intracellular recordings of neuronal potentials and spikelets.

Main Results:

  • Extracellular field effects generated waveforms resembling spikelets, though with smaller amplitudes than recorded in vitro.
  • Gap junctional coupling produced potentials similar to small excitatory postsynaptic potentials, accurately measured by electrodes.
  • Transmembrane voltage induced by electric fields was spatially dependent and significantly larger than electrode-measured activity.

Conclusions:

  • In vitro spikelets are unlikely to be mediated by gap junctions.
  • Extracellular electric fields from single neurons can produce spikelet-like waveforms, but with reduced amplitude.
  • Hypothesized that observed spikelets result from synchronized extracellular electric field effects of multiple local neurons.