α-Synuclein impairs oligodendrocyte progenitor maturation in multiple system atrophy

Area of Science:

• Neuroscience
• Cell Biology
• Pathology

Background:

• Multiple system atrophy (MSA) is an atypical parkinsonian disorder.
• It is characterized by alpha-synuclein inclusions in mature oligodendrocytes.
• Oligodendrocyte progenitor cells (OPCs) have potential to replace damaged oligodendrocytes, but their role in MSA is unknown.

Purpose of the Study:

• Investigate the role of OPCs in MSA.
• Determine if OPCs can replace mature oligodendrocytes in MSA.
• Elucidate the molecular mechanisms affecting OPC maturation in MSA.

Main Methods:

• Postmortem analysis of MSA patient brains.
• Analysis of an established MSA mouse model.
• In vitro studies using an oligodendroglial cell line expressing human alpha-synuclein.

Main Results:

• Alpha-synuclein was found within OPCs, with increased OPC numbers in the striatum of MSA patients.
• An age-dependent increase in dividing OPCs was observed in the striatum and cortex of an MSA mouse model.
• Alpha-synuclein significantly delayed OPC maturation by downregulating key myelin genes and reducing brain-derived neurotrophic factor (BDNF).

Conclusions:

• OPCs are present and proliferate in MSA, but their maturation is impaired by alpha-synuclein.
• Reduced BDNF levels contribute to the delayed OPC maturation phenotype in MSA.
• Targeting OPC maturation presents a potential therapeutic strategy for restoring glial and neuronal function in MSA.