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Related Experiment Video

Updated: May 6, 2026

A Mouse Model of Single and Repetitive Mild Traumatic Brain Injury
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PERK Deficiency Amplifies Molecular, Structural, and Network Vulnerability to Repetitive Mild Traumatic Brain Injury.

Marangelie Criado-Marrero1,2,3, Sakthivel Ravi1,2,3, Daylin Barroso1,2,3

  • 1Center for Translational Research in Neurodegenerative Disease (CTRND).

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PubMed
Summary
This summary is machine-generated.

Protein kinase RNA-like endoplasmic reticulum kinase (PERK) deficiency worsens brain damage after repetitive mild traumatic brain injury (rmTBI). PERK signaling is crucial for brain resilience against repeated injury and ER stress.

Keywords:
CHIMERAPERKdiffusion tensor imagingmicrogliaproteomicsrepetitive mild TBIresting state functional MRIstress

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Biochemistry

Background:

  • Repetitive mild traumatic brain injury (rmTBI) causes cumulative stress and progressive brain dysfunction.
  • Mechanisms of vulnerability to repeated brain injury are not fully understood.
  • Protein kinase RNA-like endoplasmic reticulum kinase (PERK) regulates cellular proteostasis and is involved in neurodegeneration and acute brain injury.

Purpose of the Study:

  • To investigate the role of neuronal PERK deficiency in the brain's response to rmTBI.
  • To determine if PERK signaling influences susceptibility and outcomes following repeated mild brain injuries.

Main Methods:

  • Utilized a mouse model with neuronal PERK deficiency.
  • Employed spatial proteomics, tissue analysis, resting-state functional MRI, and diffusion tensor imaging.
  • Assessed molecular, functional, and structural brain changes post-rmTBI.

Main Results:

  • PERK deficiency heightened susceptibility to rmTBI-induced protein homeostasis disruption.
  • Neuronal PERK deficiency altered large-scale functional connectivity.
  • Exacerbated white matter microstructural damage, indicating axonal and myelin injury, was observed in PERK-deficient mice.

Conclusions:

  • PERK signaling is a critical factor in determining brain resilience to repetitive mild injury.
  • Dysregulation of endoplasmic reticulum (ER) stress contributes to network-level dysfunction after rmTBI.
  • Molecular alterations correlate with imaging-defined network and white matter abnormalities.