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Brain Injury Impairs Working Memory and Prefrontal Circuit Function.

Colin J Smith1, Guoxiang Xiong2, Jaclynn A Elkind2

  • 1Research Institute of Children's Hospital of Philadelphia , Philadelphia, PA , USA ; Neuroscience Graduate Group, University of Pennsylvania School of Medicine , Philadelphia, PA , USA.

Frontiers in Neurology
|December 1, 2015
PubMed
Summary
This summary is machine-generated.

Traumatic brain injury (TBI) impairs working memory by altering synaptic function in the prefrontal cortex. This study reveals specific changes in excitatory and inhibitory signaling that may explain cognitive deficits after brain injury.

Keywords:
intrinsic excitabilitylateral fluid percussion injurymedial prefrontal cortexsynaptic transmissiontraumatic brain injuryworking memory

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Area of Science:

  • Neuroscience
  • Traumatic Brain Injury Research
  • Synaptic Plasticity

Background:

  • Traumatic brain injury (TBI) affects millions annually, leading to persistent cognitive deficits.
  • Current treatments for TBI-related cognitive impairment are lacking.
  • The prefrontal cortex is crucial for working memory and is vulnerable to TBI.

Purpose of the Study:

  • To investigate the impact of TBI on working memory and synaptic function in the prefrontal cortex.
  • To identify specific alterations in excitatory and inhibitory neurotransmission following TBI.
  • To explore changes in neuronal intrinsic properties in response to TBI.

Main Methods:

  • Utilized the lateral fluid percussion injury (LFPI) model in mice to simulate TBI.
  • Assessed working memory using a T-maze behavioral task.
  • Performed electrophysiological recordings (field excitatory postsynaptic potentials, spontaneous/miniature postsynaptic currents) in prefrontal cortex slices.

Main Results:

  • LFPI significantly impaired working memory performance.
  • Reduced excitatory synaptic transmission and altered excitatory/inhibitory balance in layer 2/3 neurons.
  • Layer 2/3 neurons exhibited increased action potential threshold and decreased firing rate.
  • Layer 5 neurons showed reduced input resistance and action potential duration without changes in synaptic transmission.

Conclusions:

  • TBI induces significant synaptic and intrinsic neuronal alterations in the prefrontal cortex.
  • These circuit-level changes in the prefrontal cortex are associated with working memory deficits after TBI.
  • Findings provide insights into the neurobiological mechanisms underlying cognitive impairment post-TBI.