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Silent Synapses in Cocaine-Associated Memory and Beyond.

William J Wright1, Yan Dong1

  • 1Department of Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 william.wright@pitt.edu yandong@pitt.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 11, 2021
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Cocaine use creates new, silent synapses that store drug memories. These silent synapses mature and dynamically change, driving cocaine craving and relapse.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Addiction Research

Background:

  • Glutamatergic synapses are crucial for memory formation.
  • Cocaine addiction involves synaptic adaptations and the creation of new synapses.
  • Silent synapses, lacking stable AMPA receptors, are implicated in memory encoding.

Purpose of the Study:

  • To review the molecular mechanisms of silent synapse dynamics in cocaine memory.
  • To discuss the role of silent synapses in neural circuit remodeling and cocaine-driven behaviors.
  • To propose how silent synapses form neuronal ensembles and circuit engrams for cocaine-specific behaviors.

Main Methods:

  • Review of existing literature on synaptic plasticity and cocaine addiction.
  • Analysis of molecular mechanisms underlying silent synapse formation and maturation.
  • Hypothesizing the role of silent synapses in encoding cocaine memories and driving relapse.

Main Results:

  • Cocaine experience generates new, AMPA receptor-silent synapses in the nucleus accumbens.
  • These silent synapses mature by recruiting AMPA receptors, consolidating cocaine-associated memories.
  • Matured silent synapses exhibit dynamic state changes correlating with memory destabilization and reconsolidation.

Conclusions:

  • Cocaine-generated silent synapses are distinct substrates for cocaine memory.
  • These synapses play a critical role in circuit remodeling and cocaine-memory-driven behaviors.
  • Silent synapse dynamics are hypothesized to drive cocaine relapse.