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Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
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A subiculum-hypothalamic pathway functions in dynamic threat detection and memory updating.

Juliette M A Viellard1, Fernando F Melleu2, Alicia M Tamais2

  • 1Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP 05508-000, Brazil; Institut des Maladies Neurodégénératives, Université de Bordeaux, CNRS UMR 5293, Bordeaux, France.

Current Biology : CB
|May 29, 2024
PubMed
Summary

Animals use a specific brain circuit to detect threats, respond defensively, and update fear memories. This circuit, involving the dorsal premammillary nucleus (PMd), is crucial for navigating dangerous environments.

Keywords:
defensive behaviorfear memoryhypothalamusinnate fearperiaqueductal gray

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Systems Neuroscience

Background:

  • Animals must detect threats, respond defensively, and remember locations to ensure survival.
  • A septo-hippocampal-hypothalamic circuit is implicated in processing ethological threats.

Purpose of the Study:

  • To investigate the role of the dorsal premammillary nucleus (PMd) within the septo-hippocampal-hypothalamic circuit in threat detection and memory.
  • To elucidate how this circuit manages the threat imminence continuum.

Main Methods:

  • Photometry analysis of PMd activity in freely behaving animals.
  • Chemogenetic silencing of PMd to assess its role in defensive responses and memory.
  • Optogenetic silencing of PMd projections to the periaqueductal gray and anterior medial thalamus.

Main Results:

  • The PMd functions as a threat detector, sensing dynamic changes during threat approach and avoidance.
  • PMd silencing impaired threat detection and defensive responses, while also updating fear memory.
  • PMd projections differentially influence defensive behaviors and contextual memory.

Conclusions:

  • The identified septo-hippalamic-hypothalamic circuit is vital for real-time threat detection and adaptive memory updating.
  • Understanding this circuit aids in comprehending how animals manage perceived threats and update fear associations.