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Development of a modified weight-drop apparatus for closed-skull, repetitive mild traumatic brain injuries in a mouse model.

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Development of a Modified Weight-Drop Apparatus for Closed-Skull, Repetitive Mild Traumatic Brain Injuries in a Mouse

Anthony B Crum1, Cara D Nielson2, Kaylin J Sevilla Lopez3,4,5

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Summary

A new mouse model precisely quantifies repetitive mild traumatic brain injury (rmTBI) impacts. This model reveals progressive olfactory deficits and sex-specific microglial activation, crucial for understanding rmTBI

Keywords:
concussionkinematicsneuroinflammationolfactionpreclinicaltraumatic brain injury

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Area of Science:

  • Neuroscience
  • Traumatic Brain Injury Research
  • Biomechanical Engineering

Background:

  • Repetitive mild traumatic brain injury (rmTBI) is linked to neurological issues.
  • Existing preclinical models often lack precise control over impact forces.
  • Accurate biomechanical quantification is essential for rmTBI research.

Purpose of the Study:

  • To develop and validate a reproducible mouse model for rmTBI.
  • To precisely control and quantify biomechanical forces during impacts.
  • To investigate behavioral and histological outcomes, including sex-specific differences.

Main Methods:

  • A custom weight-drop apparatus with advanced tracking systems was engineered.
  • Adult male and female mice underwent single or nine daily impacts.
  • Head kinematics, behavioral tests (olfaction), and immunohistochemistry were analyzed.

Main Results:

  • The model delivered consistent impact forces with low variability.
  • Mice showed delayed righting reflex and progressive olfactory impairment.
  • Sex-dependent microglial activation (higher in males) was observed, particularly in the corpus callosum, neocortex, and olfactory tubercle.

Conclusions:

  • The developed model offers precise rmTBI simulation for preclinical studies.
  • Findings highlight progressive olfactory deficits and sex-specific neuroinflammation.
  • The model is valuable for exploring injury thresholds and therapeutic strategies in repetitive head trauma.