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Evaluation of Blood-Brain Barrier Breakdown in a Mouse Model of Mild Traumatic Brain Injury
Published on: October 18, 2024
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Application of Delayed Contrast Extravasation Magnetic Resonance Imaging for Depicting Subtle Blood-Brain Barrier
Sigal Liraz Zaltsman1,2,3, Shirley Sharabi4, David Guez4
1The Joseph Sagol Neuroscience Center, Sheba Medical Center, Tel Hashomer, Israel.
Journal of Neurotrauma
|September 30, 2023
Summary
Delayed contrast extravasation MRI (DCM) detects subtle, long-term blood-brain barrier disruption (BBBd) after traumatic brain injury (TBI) in mice, even when standard MRI methods fail. This sensitive imaging approach reveals chronic BBBd, enhancing understanding of TBI
Area of Science:
- Neuroscience
- Medical Imaging
- Pathophysiology
Background:
- The blood-brain barrier (BBB) protects the central nervous system but can be disrupted after traumatic brain injury (TBI).
- Chronic BBB disruption (BBBd) post-TBI is difficult to detect with current technologies, leaving its long-term effects unclear.
- Subtle BBBd may contribute significantly to secondary, long-term damage following TBI.
Purpose of the Study:
- To develop and validate a sensitive magnetic resonance imaging (MRI) method for detecting subtle, long-term BBB disruption (BBBd) after TBI.
- To investigate the dynamics and presence of chronic BBBd up to 540 days post-TBI.
- To compare the sensitivity of delayed contrast extravasation MRI (DCM) with standard MRI techniques for BBBd detection.
Main Methods:
- Thirty mice underwent TBI using a weight-drop model; 19 served as controls.
- High-resolution, high-sensitivity delayed contrast extravasation MRI (DCM) was used to map BBB permeability up to 540 days post-injury.
- Brain tissue was analyzed histologically for BBB biomarkers (GFAP, AQP4, ZO-1, IgG) to validate MRI findings.
Main Results:
- DCM successfully depicted subtle BBB disruption up to 1.5 years post-TBI, outperforming standard T1-weighted and T2-weighted MRI.
- In 33% of cases, DCM detected significant BBBd where standard MRI showed no abnormalities.
- Chronic BBBd in TBI mice was significantly higher than in age-matched controls at multiple time points (30, 60, 540 days).
- Histological validation confirmed a strong correlation between DCM-derived BBB disruption levels and pathological markers.
Conclusions:
- Delayed contrast extravasation MRI (DCM) is a highly sensitive tool for detecting subtle, chronic blood-brain barrier disruption (BBBd) after traumatic brain injury (TBI).
- This advanced imaging technique can reveal BBBd missed by standard MRI, offering new insights into TBI pathophysiology.
- Routine use of sensitive, non-invasive BBBd measurement methods like DCM is expected to advance the understanding and management of TBI and potentially other CNS disorders.
