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Synaptic plasticity associated with a memory engram in the basolateral amygdala.

Ayako Nonaka1, Takeshi Toyoda1, Yuki Miura1

  • 1Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 11, 2014
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Summary

Fear learning strengthens specific synapses in a subset of mouse basolateral amygdala (BLA) neurons, reorganizing neuronal ensembles to form fear memories.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Learning and Memory

Background:

  • Synaptic plasticity is crucial for learning and memory.
  • It remains unknown if learning affects all neurons or a specific subset.

Purpose of the Study:

  • To investigate if contextual fear learning induces global or subset-specific synaptic modifications in the mouse basolateral amygdala (BLA).
  • To determine the role of synaptic plasticity in fear memory formation and neuronal ensemble reorganization.

Main Methods:

  • Genetically identifying neurons activated during contextual fear learning in mice.
  • Recording synaptic efficacy in recruited and non-recruited BLA neurons.
  • Analyzing changes in miniature EPSC frequency and paired-pulse ratio.

Main Results:

  • Fear learning induced presynaptic potentiation in cortical synapses targeting recruited BLA neurons.
  • Synaptic changes were specific to recruited neurons, not global.
  • Fear learning reorganized neuronal ensembles responsive to the conditioning context.

Conclusions:

  • Synaptic plasticity in a subset of BLA neurons contributes to fear memory.
  • Ensemble reorganization, driven by targeted synaptic plasticity, underlies fear memory expression.