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Related Experiment Videos

Activity-dependent short-term enhancement of intercellular coupling

A E Pereda1, D S Faber

  • 1Department of Anatomy and Neurobiology, Medical College of Pennsylvania, Philadelphia, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 1, 1996
PubMed
Summary

Short-term potentiation of neuronal responses can be induced by specific nerve stimulation patterns. This enhancement, lasting minutes, involves NMDA-receptor activation and postsynaptic calcium signaling, impacting both electrotonic and chemical synaptic transmission.

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Synaptic Plasticity

Background:

  • Previous studies showed long-term potentiation of electrotonic and chemical EPSPs in Mauthner cells via nerve tetanization.
  • The mechanisms and time course of short-term synaptic modifications were not fully elucidated.

Purpose of the Study:

  • To investigate the induction and mechanisms of short-term synaptic enhancements in Mauthner cells.
  • To differentiate the roles of presynaptic and postsynaptic factors in modulating electrotonic and chemical synaptic transmission.

Main Methods:

  • Stimulation of the posterior eight nerve with different tetanization patterns.
  • Electrophysiological recordings of excitatory postsynaptic potentials (EPSPs) in Mauthner cell dendrites.
  • Pharmacological manipulation using NMDA-receptor antagonists and postsynaptic calcium chelation.

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Main Results:

  • A specific tetanization pattern induced short-term (approx. 3 min) enhancements of both electrotonic and chemical EPSPs.
  • Presynaptic calcium increase selectively facilitated the chemical EPSP, not electrotonic coupling.
  • Short-lasting potentiation of electrotonic coupling required NMDA-receptor activation and postsynaptic calcium, independent of presynaptic calcium.

Conclusions:

  • Short-term synaptic enhancements involve distinct mechanisms for electrotonic and chemical components.
  • Postsynaptic factors, including NMDA-receptor activation and calcium signaling, are crucial for modulating electrotonic coupling.
  • Hemichannels at gap junctions can be independently regulated, with potential implications for widespread neural plasticity.