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Amygdala inputs to the ventral hippocampus bidirectionally modulate social behavior.

Ada C Felix-Ortiz1, Kay M Tye

  • 1Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 10, 2014
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Summary

Researchers found that manipulating the basolateral amygdala (BLA) to ventral hippocampus (vHPC) pathway bidirectionally controls social behaviors in mice. Inhibiting this pathway increased social interaction, while activating it decreased social interaction.

Keywords:
ChR2NpHRamygdalahippocampusoptogeneticssocial

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Psychiatric Research

Background:

  • Social interaction impairments are key symptoms in psychiatric disorders like autism and schizophrenia.
  • The amygdala's role in social behavior is established, but its specific connections' functions are less understood.

Purpose of the Study:

  • To investigate the role of basolateral amygdala (BLA) projections to the ventral hippocampus (vHPC) in modulating social behaviors.
  • To examine the bidirectional control of social interaction by the BLA-vHPC pathway.

Main Methods:

  • Used optogenetic tools (channelrhodopsin-2 and halorhodopsin) in mice to manipulate BLA terminals in the vHPC.
  • Employed viral vectors (AAV5) and optical fibers for targeted neural pathway activation and inhibition.
  • Assessed social behavior using the resident-juvenile-intruder home-cage test and the three-chamber sociability test.

Main Results:

  • Inhibition of BLA-vHPC projections via halorhodopsin significantly increased social interaction.
  • Activation of BLA-vHPC projections via channelrhodopsin-2 significantly reduced social behaviors.
  • Demonstrated a bidirectional modulation of social behaviors by the BLA-vHPC pathway.

Conclusions:

  • The BLA to vHPC pathway plays a critical role in regulating social behaviors.
  • Targeting the BLA-vHPC connection offers potential for novel therapeutic strategies for social deficits in psychiatric conditions.