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poster
Optimization of a translational murine model of closed-head traumatic brain injury
Introduction: Traumatic brain injury (TBI) from closed-head trauma is a leading cause of disability, with limited effective interventions. Many murine models for researching TBI impact the brain parenchyma directly and are limited by the fact that these forces do not recapitulate clinically relevant closed head injury. An alternative model applying clinically relevant injury mechanics to the intact skull may lead to variable results and as a result, preclinical modeling of TBI remains a challenge. Current models often do not explore sex differences in TBI, which is critically important for translation to clinical practice.
Objective: The current study aims to characterize a clinically relevant murine model of closed-head TBI and analyze the impact of system parameters on motor coordination, spatial learning, and neuronal damage, with comparisons made between sexes.
Methods: We systematically investigated sources of variability in a murine model of closed-head TBI and developed a framework to reduce variability across severity and sex. We manipulated pressure, dwell time, and displacement to determine effects on motor coordination, spatial learning, and neuronal damage in 10-week-old male and female mice.
Results: Increasing pressure beyond 70 psi had a ceiling effect on cellular and behavioral outcomes, while manipulating dwell time only affected behavioral performance. Increasing displacement precisely graded injury severity in both sexes across all outcomes. Physical signs of trauma occurred more frequently at higher displacements. Stratifying severity based on day-1 rotarod performance retained histological relationships and separated both sexes into injury severity cohorts with distinct patterns of behavioral recovery. Utilizing this stratification strategy, within-group rotarod variability over 6 days post-injury was reduced by 50%.
Conclusions: These results have important implications for translational research in TBI and provide a framework for using this clinically relevant model in both male and female mice.
