Glymphatic Clearance Dynamics in Traumatic Brain Injury: Mechanisms, Imaging Biomarkers, and Application Prospects

Area of Science:

• Neuroscience
• Neurology
• Biomedical Engineering

Background:

• Traumatic brain injury (TBI) causes pathological increases in brain catabolites, correlating with neurodegenerative disease risk.
• Glymphatic clearance dysfunction is a key pathogenic mechanism following TBI.
• The glymphatic system, crucial for brain fluid exchange and waste removal, is impaired by TBI.

Purpose of the Study:

• To review the pathogenic role of glymphatic clearance dysfunction in TBI.
• To explore recent advances in neuroimaging and therapeutic strategies for TBI-related glymphatic impairment.

Main Methods:

• Review of existing literature on glymphatic function, TBI pathology, and neuroimaging techniques.
• Analysis of studies utilizing dynamic contrast-enhanced MRI and diffusion tensor imaging.
• Examination of preclinical and clinical data on therapeutic interventions.

Main Results:

• TBI disrupts glymphatic function by affecting aquaporin-4, neuroinflammation, and blood-brain barrier integrity.
• Advanced neuroimaging reveals delayed tracer clearance and perivascular space abnormalities post-TBI.
• Therapeutic strategies including exercise, cannabidiol, and angiotensin II receptor antagonists show potential for improving glymphatic function.

Conclusions:

• Glymphatic clearance dysfunction is a significant contributor to secondary injury after TBI.
• Novel imaging techniques offer improved assessment of glymphatic impairment.
• Targeting lymphatic pathways and utilizing multimodal approaches hold promise for TBI treatment and precision medicine.