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Related Experiment Video

Updated: Jul 12, 2025

Controlled Cortical Impact Model for Traumatic Brain Injury
05:30

Controlled Cortical Impact Model for Traumatic Brain Injury

Published on: August 5, 2014

28.7K

Experimental traumatic brain injury increases epichaperome formation.

Sarah E Svirsky1, Youming Li2, Jeremy Henchir2

  • 1Center for Neuroscience, University of Pittsburgh, Pittsburgh, PA, USA; Department of Neurological Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA.

Neurobiology of Disease
|October 20, 2023
PubMed
Summary

Traumatic brain injury (TBI) disrupts the normal protein interactions of the chaperome, forming the epichaperome. This study reveals epichaperome formation in TBI, linking it to protein misfolding and neurodegeneration risk.

Keywords:
EpichaperomeNeurodegenerationTraumatic brain injuryhippocampus

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Heat shock proteins normally form the "chaperome" through dynamic interactions.
  • Cellular stress can alter the chaperome into the "epichaperome," leading to protein misfolding and aggregation.
  • The epichaperome's role in traumatic brain injury (TBI) is currently unknown.

Purpose of the Study:

  • This study is the first to investigate the epichaperome mechanism in TBI.
  • To examine the formation and dynamics of the epichaperome in the hippocampus after controlled cortical impact (CCI).
  • To determine the effects of injury and sex on epichaperome formation over time.

Main Methods:

  • Adult male and female Sprague-Dawley rats underwent CCI to induce TBI.
  • Hippocampal tissues were collected at 24 hours, 1, 2, and 4 weeks post-injury.
  • Epichaperome complex formation was assessed by measuring HSP90, HSC70, and HOP expression using native-PAGE, normalized to monomeric protein levels.
  • Two-way ANOVA was used to analyze the effects of injury and sex.

Main Results:

  • Controlled cortical impact significantly increased epichaperome formation across all measured proteins (HSP90, HSC70, HOP) at all time points.
  • A significant effect of injury was observed for native HSP90, HSC70, and HOP expression.
  • HSC70 and HOP also showed significant sex-specific effects at 24 hours and 4 weeks post-injury.

Conclusions:

  • CCI in rats leads to a significant increase in epichaperome formation in the hippocampus.
  • This suggests the epichaperome is a key pathological mechanism in TBI-induced protein dishomeostasis.
  • Further research into the epichaperome may elucidate the link between TBI and neurodegenerative diseases, offering therapeutic targets.