mTBI-Induced Systemic Vascular Dysfunction in a Mouse mTBI Model

Area of Science:

• Neuroscience
• Pathology
• Vascular Biology

Background:

• Mild traumatic brain injury (mTBI) is a common yet serious public health issue.
• Animal models are crucial for understanding TBI mechanisms and effects.
• Existing mTBI models have varying parameters influencing injury severity.

Purpose of the Study:

• To develop and characterize a reproducible mouse model for closed-head mTBI.
• To investigate the effects of single and repetitive mTBIs (rmTBIs) on endothelial function.
• To assess neuroinflammation and neurobehavioral deficits following mTBI.

Main Methods:

• Developed a closed-head mTBI mouse model using controlled impact forces (500-800 kdyn).
• Assessed brain injury via histological (GFAP staining) and molecular methods.
• Measured neuroinflammation using plasma cytokine assays (IL-1β, SOD) and neurobehavioral tests.
• Evaluated aortic endothelial function using isometric-tension studies.

Main Results:

• The mTBI model demonstrated repeatability and comparable pathological features.
• Significant acute neurobehavioral deficits and elevated GFAP staining were observed post-mTBI.
• Increased plasma IL-1β and SOD levels within 2 hours after mTBI.
• Repetitive mTBIs induced pronounced and persistent endothelial dysfunction in mouse aortas.

Conclusions:

• The developed mTBI mouse model is reliable for TBI research.
• mTBI leads to acute neuroinflammation and functional deficits.
• Repetitive mTBIs cause significant, long-term vascular endothelial dysfunction, underscoring a critical health concern.