Rat Model of Closed-Head Mild Traumatic Injury and its Validation

Yishu Liu; Tingting Wang; Changquan Zhang; Jifeng Cai

doi:10.3791/65849

Modelo de Lesão Traumática Leve de Cabeça Fechada em Rato e sua Validação

JoVE Journal
Neuroscience
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JoVE Journal Neuroscience

Rat Model of Closed-Head Mild Traumatic Injury and its Validation

Modelo de Lesão Traumática Leve de Cabeça Fechada em Rato e sua Validação

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08:07 min

September 22, 2023

DOI: 10.3791/65849-v

Yishu Liu*¹, Tingting Wang*¹, Changquan Zhang¹, Jifeng Cai¹

¹Department of Forensic Science,School of Basic Medical Science, Central South University

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Overview

This study introduces a closed-head mild traumatic brain injury (mTBI) rat model, validated to closely resemble human mTBI behavioral manifestations during acute and subacute stages. The model offers a novel approach for inducing mTBI and enables rapid assessment of injury outcomes to facilitate research into the injury's effects.

Key Study Components

Area of Science

Neuroscience
Behavioral Studies
Injury Models

Background

Mild traumatic brain injury (mTBI) is a significant health concern with unclear pathology.
Current models may not replicate the human condition adequately.
Validated models are necessary for understanding injury mechanisms and developing treatments.
The use of closed-head models may minimize confounding variables like inflammation.

Purpose of Study

To develop an accurate mTBI rat model that mimics clinical presentations of human injuries.
To provide a comprehensive and standardized methodology for inducing and assessing mTBI.
To facilitate further research on biomolecular markers associated with mTBI.

Methods Used

The model employs a closed-head impact scenario using a weighted mechanism.
Anesthetized rats undergo controlled impact with no scalp incision, reducing inflammatory responses.
Behavioral assessments include recovery time, seeking behavior, balance tasks, and memory tests.
Key evaluations include timing of recovery, performance on balance beams, and exploration in mazes.

Main Results

mTBI rats showed prolonged recovery durations and increased seeking behavior during recovery.
Behavioral testing highlighted balance impairments and anxiety-like behavior consistent with brain injury.
Performances on the beam balance task and water maze clearly differentiated mTBI from control groups.
The rat model provides insights into the recovery trajectory and behaviors post-injury.

Conclusions

This model effectively demonstrates the acute and subacute impacts of mTBI on behavior, paving the way for future research.
Understanding the recovery dynamics may inform therapeutic approaches for mTBI.
The results lay the groundwork for investigating potential biomolecular markers for clinical applications.

Frequently Asked Questions

What are the advantages of the closed-head mTBI model?

The closed-head mTBI model minimizes inflammatory responses that can confound results and closely simulates human injury scenarios.

How is the mild traumatic brain injury induced?

Anesthetized rats are positioned under a weighted impact mechanism, which simulates a closed-head trauma without scalp incision.

What types of behavioral assessments are performed?

Behavioral assessments include recovery time, balance performance on beams, exploration in an open field, and navigation in a water maze.

Can the methodology be adapted for other studies?

Yes, the model can be adapted for studies examining various recovery trajectories and interventions for brain injuries.

What limitations should be considered with this model?

Care must be taken to ensure behavioral assessments are standardized, and external factors affecting recovery are minimized.

What implications do these findings have for understanding mTBI?

The findings enhance our understanding of behavioral impairments and recovery associated with mTBI, guiding future therapeutic developments.

Aqui, apresentamos um modelo de traumatismo cranioencefálico (TCEm) de cabeça fechada em ratos e sua validação exibindo notável semelhança com o TCEm humano em relação às manifestações comportamentais durante as fases aguda e subaguda.

Neste estudo, introduzimos um modelo de lesão cerebral traumática leve de cabeça fechada em ratos e fornecemos uma visão abrangente de sua validação. Nosso objetivo era oferecer uma abordagem simples para replicar esse tipo de lesão cerebral e um método de avaliação rápida para confirmar o sucesso do modelo. Este modelo simula com sucesso um traumatismo cranioencefálico leve fechado, sem a necessidade de incisão no couro cabeludo ou abertura do crânio, fornecendo uma representação mais precisa do cenário de impacto observado em casos humanos.

Evitar a incisão do couro cabeludo ajuda a prevenir respostas inflamatórias que podem não se alinhar com a situação ativa. O traumatismo cranioencefálico leve carece de métodos diagnósticos subjetivos e precisos. No futuro, nosso laboratório continuará a explorar possíveis marcadores biomoleculares e seus mecanismos moleculares profundos, e ajudará a transformar os marcadores moleculares obtidos em práticas clínicas e forenses de identificação.

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