Modified device for fluid percussion injury in rodents

Area of Science:

• Neuroscience
• Biomedical Engineering

Background:

• The fluid percussion (FP) injury model is widely used for studying traumatic brain injury (TBI) in animal models.
• Existing FP devices have limitations in validity and reliability that need addressing.

Purpose of the Study:

• To enhance the validity and reliability of the FP injury model for TBI research.
• To develop a more automatic and accurate FP device for inducing TBI in mice.

Main Methods:

• Adapted the FP device with an electromagnetic protractor, stainless-steel cylinder, adjustable pressure transducer, and foam pads.
• Implemented a graphic user interface for real-time measurement and display of FP pulse parameters.
• Administered lateral fluid percussion injury (FPI) to the right frontal motor-sensory region of male C57BL/6J mice.
• Collected behavioral, cognitive, electrophysiological, and immunohistochemical data to assess TBI effects.

Main Results:

• The modified FP device produced reliable and accurate FP pulses, improving pendulum leveling accuracy.
• TBI mice exhibited significant motor, cognitive, and functional impairments compared to sham controls.
• Reduced neuronal firing rates and theta powers in the hippocampal CA1 region were observed in TBI mice.
• Histopathological findings correlated with the observed neurobehavioral deficits.

Conclusions:

• The adapted FP device successfully induced TBI-like effects in mice, consistent with existing models.
• The modifications enhance the device's accuracy, reliability, and automation, potentially increasing its utility in TBI research.
• These findings validate the adjustments made to the FP device for TBI studies.