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Glymphatic Dysfunction, Brain Damage, and Clinical Disability in Spinocerebellar Ataxia Type 3
Jing Guo1,2,3, Jun Xie2,3, Yunshuang Fan2,3
17T Magnetic Resonance Translational Medicine Research Center, Department of Radiology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.
Summary
Glymphatic system function is impaired in spinocerebellar ataxia type 3 (SCA3), even before symptoms appear. This dysfunction is linked to brain damage and disability in SCA3 patients.
Area of Science:
- Neuroscience
- Neurology
- Biomedical Engineering
Background:
- The glymphatic system clears waste from the central nervous system and is a potential therapeutic target for neurodegenerative diseases.
- Spinocerebellar ataxia type 3 (SCA3) pathogenesis involves protein accumulation, potentially linked to glymphatic system dysfunction.
Purpose of the Study:
- To investigate glymphatic system function in SCA3 patients.
- To evaluate the relationship between glymphatic function, brain damage, and clinical disability in SCA3.
Main Methods:
- Ninety-two SCA3 patients (premanifest and manifest) and 98 healthy controls were assessed.
- Magnetic resonance imaging (MRI) was used to calculate the diffusion along the perivascular space (DTI-ALPS) index, gray matter volumes, and white matter microstructural properties.
Main Results:
- SCA3 patients, including those premanifest, showed lower ALPS indices than controls.
- Lower ALPS indices correlated with greater disability, longer disease duration (after 3 years), and increased neurodegeneration (cortical/subcortical atrophy, white matter changes).
Conclusions:
- Glymphatic function is impaired in SCA3, even in the presymptomatic stage.
- This impairment is associated with neurodegeneration and demyelination, suggesting a role in SCA3 pathogenesis.
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