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Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
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Chronic Alterations in Systemic Immune Function after Traumatic Brain Injury.

Rodney M Ritzel1, Sarah J Doran1, James P Barrett1

  • 1Department of Anesthesiology and Center for Shock, Trauma and Anesthesiology Research (STAR), University of Maryland School of Medicine , Baltimore, Maryland.

Journal of Neurotrauma
|February 10, 2018
PubMed
Summary

Traumatic brain injury (TBI) causes long-term immune suppression and cellular dysfunction. Chronic TBI in mice shows impaired immune responses and signs of accelerated immune aging, impacting recovery.

Keywords:
chronic inflammationimmunosuppressionsystemic immunitytraumatic brain injury

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Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Traumatic brain injury (TBI) is linked to immune suppression.
  • Long-term effects of TBI on systemic immunity remain unclear.

Purpose of the Study:

  • To investigate the chronic consequences of TBI on systemic immune function in mice.
  • To analyze immune cell composition, function, and cytokine production post-TBI.

Main Methods:

  • Controlled cortical impact (CCI) model in adult male mice.
  • Flow cytometry analysis of bone marrow, blood, thymus, and spleen at multiple time points.
  • In vitro immune challenge studies with bone marrow-derived macrophages (BMDMs).

Main Results:

  • TBI induced acute neutrophilia and impaired neutrophil/monocyte function.
  • Chronic TBI led to elevated ROS, impaired macrophage polarization, thymic involution, and altered T cell profiles.
  • Deficits in innate and adaptive immune responses were observed long-term.

Conclusions:

  • TBI causes widespread, long-lasting suppression of innate and adaptive immunity.
  • Chronic TBI in mice exhibits hallmarks of accelerated immune aging.
  • These findings highlight the profound impact of TBI on systemic immune homeostasis.