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Decreasing GABA function within the medial prefrontal cortex or basolateral amygdala decreases sociability.

Tracie A Paine1, Nathan Swedlow1, Lucien Swetschinski1

  • 1Department of Neuroscience, Oberlin College, Oberlin, OH, 44074, United States.

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|October 13, 2016
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Summary

Decreasing GABA transmission in the medial prefrontal cortex (PFC) or basolateral amygdala (BLA) reduces social behavior in rats. This suggests GABA signaling deficits may cause social withdrawal in conditions like autism and schizophrenia.

Keywords:
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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Psychiatric Research

Background:

  • Decreased sociability is a symptom of autism spectrum disorder and schizophrenia.
  • These conditions are linked to reduced GABA function in the medial prefrontal cortex (PFC) and basolateral amygdala (BLA).
  • The PFC and BLA are key structures within the brain's social circuitry.

Purpose of the Study:

  • To investigate if reduced GABA transmission in the PFC or BLA affects social behavior.
  • To determine the role of GABAergic signaling in social interaction and preference.

Main Methods:

  • Rats received bilateral infusions of bicuculline methiodide (BMI), a GABAA receptor antagonist, into the PFC or BLA.
  • Behavioral tests included social interaction, social preference, sucrose preference, and locomotor activity.
  • BMI was administered at doses of 0, 25, or 50 ng/μl.

Main Results:

  • Infusions of BMI into the BLA or PFC significantly decreased social interaction time and instances.
  • Rats treated with 50 ng BMI showed no preference for social over non-social stimuli.
  • Observed changes in sociability were independent of alterations in reward processing or locomotor activity.

Conclusions:

  • Reduced GABA transmission in either the PFC or BLA diminishes social behavior.
  • GABA signaling deficits may underlie social withdrawal in psychiatric disorders like autism and schizophrenia.
  • Targeting GABA transmission could be a therapeutic strategy for social withdrawal.