Electromagnetic Controlled Closed-Head Model of Mild Traumatic Brain Injury in Mice
September 28th, 2022
The protocol describes mild traumatic brain injury in a mouse model. In particular, a step-by-step protocol to induce a mild midline closed head injury and the characterization of the animal model is fully explained.
Most traumatic brain injuries are mild, or more commonly known as a concussion.The CHI procedure models pathologists that can occur following a mild TBI in people.The CHI protocol is highly reproducible with low variability, and only requires a single closed head impact, making the model accessible to new users.In addition to understanding how the brain changes after a mild TBI, the CHI model can be used to test therapies to speed recovery.One of the challenging steps in performing the CHI surgery is securing the animal into the stereotaxic frame.In particular, the most difficult part is placing the ear bars.This can only be learned with practice.Use a designated surgical area, such as a hood or dedicated surgical room to perform surgery.Ensure that the surgical area includes a heating pad, a stereotaxic frame equipped with an electromagnetic impactor, and an anesthesia mask designed to administer isoflurane gas.For impactor setup, select the five-millimeter probe tip.Screw the probe tip to the piston at the bottom center of the actuator, and gently tighten the probe without applying excessive force.Re-tighten the tip between impacts.Next, set up the impact velocity by rotating the large knob on the left side of the control box until an impact velocity of 5.0
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Overview
This protocol describes the induction of mild traumatic brain injury (TBI) using a closed head impact (CHI) model in mice. It details the steps required for the procedure as well as the characterization of the animal model, aiding in understanding recovery mechanisms from mild TBIs.
Key Study Components
Area of Science
- Neuroscience
- Traumatic Brain Injury
- Animal Models
Background
- Mild TBIs, commonly known as concussions, are prevalent and can affect brain function.
- The CHI procedure is designed to model injuries and recovery processes observed in human concussions.
- This model provides a reproducible method for new researchers in the field.
Purpose of Study
- To replicate mild TBI conditions in an animal model for research purposes.
- To understand the biological changes following a mild TBI.
- To test potential therapies aimed at accelerating recovery from mild TBIs.
Methods Used
- The platform involves surgical techniques to induce a mild midline closed head injury.
- The model uses mice to evaluate the effects of mild TBI following a singular closed head impact.
- Critical steps include securing the animal in a stereotaxic frame and administering isoflurane gas for anesthesia.
- The impact setup is described, including using a five-millimeter probe tip and setting appropriate impact velocities.
Main Results
- The protocol showcases a method to induce mild TBI and outlines the important mechanical setup for reproducibility.
- Results detail how this model can inform recovery pathways and test therapeutic interventions.
Conclusions
- The study provides a structured approach for researchers to investigate mild TBI effects and recovery.
- This model enhances the understanding of neuronal responses to injury and aids in evaluating recovery therapies.
