TDP-43 pathology occurs infrequently in multiple system atrophy

Area of Science:

• Neuroscience
• Neuropathology
• Proteinopathies

Background:

• Multiple system atrophy (MSA) shares clinical and pathological features with TDP-43 and FUS proteinopathies.
• Investigating TDP-43 and FUS pathology in MSA is crucial for understanding disease mechanisms.

Purpose of the Study:

• To examine autopsy-derived brain tissue from 29 MSA patients for evidence of TDP-43 or FUS pathology.
• To differentiate the pathogenetic mechanisms of MSA from TDP-43 and FUS-linked neurodegenerative diseases.

Main Methods:

• Immunohistochemical studies were performed on autopsy material from 29 MSA patients.
• Analysis focused on the presence and distribution of TDP-43 and FUS pathology.

Main Results:

• TDP-43 pathology was rare in MSA cases.
• No fused in sarcoma (FUS) lesions were detected.
• Observed TDP-43 lesions were primarily dystrophic, perivascular, and subpial, located in the medio-temporal lobe and subcortical areas.

Conclusions:

• The clinical manifestations of MSA, including neurobehavioral, cognitive, and pyramidal signs, are not attributed to TDP-43 or FUS pathology.
• MSA appears to be primarily an α-synuclein-mediated oligodendrogliopathy, characterized by glial cytoplasmic inclusions and neurodegeneration.
• The pathogenesis of MSA differs from that of neurodegenerative diseases associated with pathological TDP-43.