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  1. Home
  3. Microglia Regulate Nucleus Accumbens Synaptic Development And Circuit Function Underlying Threat Avoidance Behaviors.
  1. Home
  3. Microglia Regulate Nucleus Accumbens Synaptic Development And Circuit Function Underlying Threat Avoidance Behaviors.

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Microglia regulate nucleus accumbens synaptic development and circuit function underlying threat avoidance behaviors.

Michael W Gongwer1,2,3, Fanny Etienne1, Eric N Moca1

  • 1Department of Physiology, University of California Los Angeles, CA, USA.

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|February 20, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Microglia are crucial for synapse development in the brain's nucleus accumbens. Their absence impairs excitatory synapse formation, impacting emotional regulation and behavior later in life.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Central nervous system (CNS) microglia are known for synapse pruning during neurodevelopment.
  • Limited research exists on microglial roles in synapse formation, particularly in brain regions beyond the cortex.

Purpose of the Study:

  • To investigate the impact of microglial absence on synaptic development in the nucleus accumbens (NAc).
  • To understand the role of microglia in early NAc development and its implications for psychiatric disorders.

Main Methods:

  • Utilized a genetically modified mouse model lacking microglia (Csf1rΔFIRE/ΔFIRE).
  • Analyzed excitatory synapse formation, electrophysiology, and NAc proteomics.
  • Assessed threat avoidance behavior and NAc neuronal activity.

Main Results:

  • Absence of microglia led to blunted excitatory synapse formation in the NAc, most prominent in early postnatal weeks.
  • Observed increased presynaptic release probability and altered postsynaptic kinetics.
  • Proteomics revealed impacts on synapse structure and signaling proteins; astrocyte-derived cues remained unaffected.
  • Despite normalization of synaptic changes by adulthood, lasting behavioral deficits in threat avoidance were noted, linked to altered NAc neuronal activity.

Conclusions:

  • Microglia play a critical role in shaping the developing NAc synaptic landscape.
  • Microglial-derived factors are essential for proper synapse formation in the NAc.
  • Early microglial function influences the establishment of adult behavioral circuits and neuronal activity.