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Divergent Spatial Learning, Enhanced Neuronal Transcription, and Blood-Brain Barrier Disruption Develop During

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Sleep fragmentation after traumatic brain injury (TBI) causes lasting behavioral changes and blood-brain barrier dysfunction, even after recovery. This highlights the need for managing sleep disturbances post-TBI for better outcomes.

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Area of Science:

  • Neuroscience
  • Traumatic Brain Injury Research
  • Inflammation and Immunology

Background:

  • Traumatic brain injury (TBI) can lead to chronic neuroinflammation and reduced quality of life.
  • Sleep fragmentation (SF) is a stressor that can worsen neuroinflammation after TBI.
  • Understanding the long-term effects of post-TBI SF is crucial for improving patient care.

Purpose of the Study:

  • To investigate the lasting behavioral and inflammatory consequences of sleep fragmentation (SF) following traumatic brain injury (TBI) in mice, even after a recovery period.
  • To determine if SF exacerbates neuroinflammation and blood-brain barrier (BBB) dysfunction after TBI.

Main Methods:

  • Male and female mice underwent either a moderate lateral fluid percussion TBI or sham surgery.
  • Half of the TBI and sham groups were exposed to daily SF for 30 days.
  • Mice recovered from SF (SF-R) for 30 days (30-60 days post-injury) before behavioral and molecular analyses.

Main Results:

  • While global cognitive performance was unaffected, TBI mice exposed to SF showed impaired learning within testing days after recovery.
  • These mice exhibited increased expression of neuronal genes and signs of blood-brain barrier (BBB) dysfunction.
  • Specifically, altered Aquaporin-4 (AQP4) expression and increased CD45+ cells indicated persistent BBB disruption and inflammation.

Conclusions:

  • Post-TBI sleep fragmentation induces persistent, divergent behavioral changes and neuroinflammation.
  • Lasting blood-brain barrier disruption is a key consequence of SF following TBI.
  • Managing sleep disturbances after TBI is essential for mitigating long-term negative outcomes.