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Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
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Central amygdala micro-circuits mediate fear extinction.

Nigel Whittle1,2, Jonathan Fadok1,3, Kathryn P MacPherson4

  • 1Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.

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|July 7, 2021
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Summary
This summary is machine-generated.

Fear extinction involves changes in the central amygdala (CEA). Specific inhibitory microcircuits in the CEA are crucial for forming extinction memories and reducing fear responses.

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Area of Science:

  • Neuroscience
  • Behavioral Science

Background:

  • Fear extinction is an adaptive process that reduces defensive responses after encountering fear stimuli without harm.
  • The central amygdala (CEA) plays a key role in fear extinction, with previous research suggesting it acts as an output relay.
  • Emerging evidence indicates the CEA comprises diverse neuronal subpopulations that regulate fear responses.

Purpose of the Study:

  • To investigate the role of specific neuronal subpopulations within the lateral (CEl) and medial (CEm) CEA during fear extinction.
  • To determine if fear extinction induces stimulus- and context-specific changes in neuronal activity within the CEA.
  • To identify the contribution of protein kinase C delta-expressing (PKCδ) CEl neurons to fear extinction.

Main Methods:

  • Behavioral analysis of fear responses in mice.
  • In vivo electrophysiological recordings to monitor neuronal activity.
  • Anatomical tracing and optogenetic manipulation of specific neuronal populations.
  • Genetic profiling of CEA cell types.

Main Results:

  • Fear extinction resulted in reversible, stimulus- and context-specific alterations in neuronal responses within the CEl and CEm.
  • These neuronal changes were absent in cases of deficient fear extinction.
  • Selective inhibition of PKCδ-expressing CEl neurons significantly impaired fear extinction.

Conclusions:

  • The CEA contains functionally and genetically distinct neuronal subpopulations that are dynamically modulated during fear extinction.
  • Inhibitory microcircuits within the CEA, particularly those involving PKCδ CEl neurons, are critical for mediating fear extinction memories.
  • These findings reveal novel cellular mechanisms underlying fear extinction within the corticolimbic network.