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Related Experiment Videos

Trans-synaptic plasticity: presynaptic initiation, postsynaptic memory.

Qin Wan1, Thomas W Abrams

  • 1Department of Pharmacology, University of Maryland School of Medicine, Baltimore, Maryland 21201-1559, USA.

Current Biology : CB
|March 13, 2008
PubMed
Summary
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Serotonin triggers persistent synaptic facilitation in Aplysia by enhancing glutamate responsiveness through rapid protein synthesis. This memory is postsynaptic, but initiated by increased presynaptic glutamate release.

Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Molecular Biology

Background:

  • Serotonin is known to modulate synaptic function.
  • Synaptic facilitation is a key mechanism for memory formation.
  • Understanding the molecular basis of long-term synaptic changes is crucial.

Purpose of the Study:

  • To elucidate the novel mechanism of persistent synaptic facilitation induced by serotonin in Aplysia.
  • To investigate the roles of postsynaptic protein synthesis and glutamate responsiveness.
  • To determine the presynaptic and postsynaptic contributions to the memory trace.

Main Methods:

  • Electrophysiological recordings of Aplysia synapses.
  • Application of serotonin to induce synaptic changes.
  • Assessment of postsynaptic responses to glutamate.

Related Experiment Videos

  • Analysis of spontaneous glutamate release from presynaptic terminals.

    • Main Results:

    • Serotonin induces persistent synaptic facilitation dependent on rapid postsynaptic protein synthesis.
    • Increased responsiveness to glutamate was observed postsynaptically.
    • The memory for synaptic change was localized postsynaptically.
    • An increase in spontaneous glutamate release from presynaptic terminals initiated the process.

    Conclusions:

    • A novel mechanism for serotonin-induced persistent synaptic facilitation in Aplysia has been identified.
    • The process involves rapid postsynaptic protein synthesis and enhanced glutamate sensitivity.
    • While the memory is postsynaptic, the initiating signal originates presynaptically.