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Related Experiment Videos

[Intrasynaptic ephaptic feedback in central synapses].

L L Voronin1

  • 1Brain Research Institute, Russian Academy of Medical Sciences, Moscow, Russia.

Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova
|October 8, 1999
PubMed
Summary
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Researchers explored electrical linking in central synapses, finding that postsynaptic membrane potential changes can control synaptic efficacy. This novel feedback mechanism influences synaptic strength, particularly in large synapses.

Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Computational Neuroscience

Context:

  • Investigating synaptic transmission mechanisms in the central nervous system.
  • Examining A. L. Byzow's hypothesis of ephatic linking in central synapses.
  • Utilizing rat visual cortex and hippocampus slices for experimental analysis.

Purpose:

  • To test the existence of positive feedback in central synapses via electrical (ephatic) linking.
  • To determine if postsynaptic membrane potential (MP) hyperpolarization influences presynaptic transmitter release.
  • To analyze changes in synaptic parameters during hyperpolarization.

Summary:

  • Experiments on rat brain slices revealed that postsynaptic hyperpolarization can increase presynaptic transmitter release, supporting the ephatic linking hypothesis.

Related Experiment Videos

  • Observed non-classical effects, including supralinear amplitude-voltage relations and voltage-dependent paired-pulse facilitation, were prominent in giant mossy fibre-CA3 synapses.
  • These effects, consistent with simulations of Byzov's synaptic model, suggest a novel feedback mechanism where postsynaptic neurons control synaptic efficacy.

    • Impact:

    • Reveals a novel feedback mechanism allowing postsynaptic neurons to modulate synaptic efficacy.
    • Demonstrates that postsynaptic MP modifications can control a subset of central synapses.
    • Explains the role of increased "perforated" synapses in long-term potentiation and behavioral conditioning.