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Updated: Sep 15, 2025
Electromagnetic Controlled Closed-Head Model of Mild Traumatic Brain Injury in Mice
Published on: September 28, 2022
Early-Life Mild Traumatic Brain Injury Alters Neurodevelopment and Behavior in Mice
Rachel R Corrigan1, Anna O Lanier1, Emily S Dresher1
1Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA.
Insights
Early life mild traumatic brain injury (mTBI) in mice caused lasting white matter loss and behavioral deficits. This research highlights potential long-term neurodevelopmental consequences of pediatric head injuries.
Area of Science:
- Neuroscience
- Developmental Biology
- Pediatric Traumatology
Background:
- Mild traumatic brain injury (mTBI) affects many children, with some experiencing persistent behavioral and cognitive issues.
- The mechanisms by which early-life mTBI impacts brain development are not well understood.
Purpose of the Study:
- To investigate the effects of early-life mTBI on neurodevelopment and behavior in a mouse model.
- To explore the underlying biological changes in the brain following mild injury.
Main Methods:
- Induced mTBI in P7 mice using a weight-drop model with varying impact intensities.
- Assessed white matter integrity via myelin basic protein (MBP) immunoreactivity.
- Examined microglial activation (Iba1) and complement signaling.
- Evaluated developmental milestones and ultrasonic vocalizations (USVs).
Main Results:
- Significant white matter loss observed at 5 days post-injury (dpi).
- Increased expression of complement signaling proteins involved in synaptic pruning.
- Injured mice showed delayed developmental milestones and altered communication patterns (USVs).
Conclusions:
- Early-life mTBI can lead to significant neurodevelopmental consequences, including white matter damage and lasting behavioral deficits.
- Microglial-mediated synaptic pruning may be affected by mTBI during critical developmental periods.
- Further research is warranted to understand the mechanisms driving these long-term neurological effects of mild pediatric head injuries.
Abstract:
Approximately 280 children per 100,000 experience closed-head injuries each year, with over 80% being mild in severity. While most children with mild injuries do not require admission to a hospital and recover well over time, some children experience persistent behavioral and cognitive abnormalities that continue into adolescence. Mild traumatic brain injury (mTBI) during early life has potential to disrupt critical developmental processes and lead to long-term consequences; however, the mechanistic underpinnings of mTBI's effects on brain development remain understudied. Here, we investigated the effects of early-life mTBI on developmental outcomes using a mouse model. Injury was induced on post-natal day 7 by a single weight drop of one of three different impact intensities. Injury resulted in significant white matter loss as measured by myelin basic protein immunoreactivity at 5 days post injury (dpi). There was no change in the extent of Iba1-positive microglial staining at 5 dpi; however, there was increased expression of complement signaling proteins responsible for microglial-regulated synaptic pruning during this time in development. To assess the neurological consequences of mTBI, we examined the development of innate behaviors and ultrasonic vocalization communication. Injured mice were slower to achieve developmental milestones and exhibited altered communication, indicating functional deficits associated with mild injury. Altogether, this study provides evidence for neurodevelopmental consequences of mTBI and demonstrates lasting behavioral effects, suggesting further investigation of mechanisms contributing to neurological effects of mild injury in early life is warranted.
