Cerebellar cortical atrophy in experimental autoimmune encephalomyelitis

Area of Science:

• Neuroscience
• Immunology
• Radiology

Background:

• Brain atrophy measured by MRI correlates with disability in multiple sclerosis (MS).
• The neuropathological mechanisms driving grey matter atrophy in MS are not fully understood.
• Investigating grey matter atrophy in animal models is crucial for understanding MS pathogenesis.

Purpose of the Study:

• To determine if brain atrophy occurs in the experimental autoimmune encephalomyelitis (EAE) mouse model.
• To investigate the neuropathological mechanisms underlying grey matter atrophy in EAE.
• To establish a preclinical model for studying grey matter atrophy in MS.

Main Methods:

• Postmortem high-resolution T2-weighted magnetic resonance microscopy (MRM) was used on 32 mouse brains (21 EAE, 11 control).
• A deformable atlas approach quantified volumetric changes in neuroanatomical structures.
• Histology and MRM were used to detect white matter lesions at early disease stages.

Main Results:

• A significant decrease in cerebellar cortex volume was observed in late-stage EAE mice compared to controls.
• Cerebellar cortical atrophy showed a direct correlation with disease duration.
• Cerebellar white matter lesions were detected by histology and MRM at 15 days post-induction.

Conclusions:

• Myelin-specific autoimmune responses can induce grey matter atrophy in the central nervous system (CNS).
• The EAE mouse model provides a valuable tool for investigating the mechanisms of grey matter atrophy in MS.
• This model can facilitate the development of targeted therapies for MS-related brain atrophy.