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Related Experiment Video

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A Mouse Model of Single and Repetitive Mild Traumatic Brain Injury
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How repetitive traumatic injury alters long-term brain function.

Navpreet K Dhillon1, Nikhil T Linaval, Jacqueline O'Rourke

  • 1From the Department of Surgery, Division of Trauma and Critical Care (N.K.D., N.T.L., G.B., A.Y., E.J.L.), and Regenerative Medicine Institute (J.O., N.C., O.S.), Cedars-Sinai Medical Center, Los Angeles, California.

The Journal of Trauma and Acute Care Surgery
|May 31, 2020
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Summary

Recurrent traumatic brain injury (rTBI) causes lasting motor deficits and brain changes, including thinning cortex and reduced neuroprotection pathways, years after injury. This highlights ongoing deterioration due to rTBI

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Area of Science:

  • Neuroscience
  • Traumatic Brain Injury Research

Background:

  • Long-term effects of recurrent traumatic brain injury (rTBI) on brain function remain poorly understood.
  • Investigating the mechanisms behind persistent brain deterioration after rTBI is crucial for developing effective interventions.

Purpose of the Study:

  • To characterize the mechanistic causes of long-term brain deterioration following rTBI.
  • To assess persistent motor deficits and structural brain changes in a rat model of rTBI.

Main Methods:

  • Bilateral rTBI or sham treatment was administered to Sprague-Dawley rats weekly for 5 weeks.
  • Motor function was evaluated using rotarod, beam walk, and grip strength tests.
  • Brain tissue analysis included volume computation, gene expression profiling (RNA sequencing), and BDNF level measurement.

Main Results:

  • Rats subjected to rTBI exhibited permanent motor deficits one year post-injury.
  • rTBI resulted in cortical and corpus callosum thinning, enlarged ventricles, and differential gene expression, notably downregulating neuroprotection and neuroplasticity pathways.
  • Brain-derived neurotrophic factor (BDNF) levels were significantly reduced in rTBI rats compared to controls.

Conclusions:

  • rTBI induces significant, long-term brain alterations, leading to persistent motor deficits and structural damage.
  • Reduced expression of genes involved in neuroplasticity and neuroprotection, along with decreased BDNF, contributes to ongoing brain deterioration after rTBI.
  • The study underscores that rTBI can lead to delayed neurological abnormalities and continued brain decline.