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Related Experiment Videos

An evaluation of synapse independence.

B Barbour1

  • 1Laboratoire de Neurobiologie, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8544, Ecole Normale Supérieure, 75230 Paris Cedex 05, France.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 6, 2001
PubMed
Summary
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Brain information storage relies on independent synapses. Simulations show glutamate spillover minimally affects neighboring glutamatergic synapses, supporting independent synaptic function and maximizing brain storage capacity.

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Synaptic Plasticity

Background:

  • Information storage in the brain is thought to depend on synaptic efficacy modifications.
  • Maximizing brain storage capacity may require maximizing the number of independently operating synapses.
  • Glutamatergic synapses, prevalent in the brain, risk compromised independence due to glutamate spillover to neighboring synapses.

Purpose of the Study:

  • To evaluate the independence of central glutamatergic synapses.
  • To compare direct synaptic activation with activation resulting from glutamate spillover.
  • To determine if glutamate spillover significantly impacts neighboring synapses.

Main Methods:

  • Simulated synaptic activation and spillover responses using a computational model.

Related Experiment Videos

  • Model based on hippocampal synapse data and includes extrasynaptic space representation.
  • Incorporated recent data on glutamate transporter distribution and properties.

    • Main Results:

    • For a single vesicle release, the estimated mean response at the nearest neighboring synapse was less than 5% of the direct synaptic response.
    • Investigated factors influencing synaptic and spillover responses.
    • Model suggests minimal cross-activation between adjacent synapses.

    Conclusions:

    • Central synapses, particularly glutamatergic ones, can operate independently.
    • Glutamate spillover has a limited impact on neighboring synapses, supporting the hypothesis of independent synaptic function.
    • Independent synaptic operation is likely crucial for maximizing the brain's information storage capacity.