Alpha-synuclein levels in patients with multiple system atrophy: a meta-analysis.

Area of Science:

• Neuroscience
• Biochemistry
• Clinical Neurology

Background:

• Multiple system atrophy (MSA) is a progressive neurodegenerative disorder.
• α-synuclein is a protein implicated in the pathogenesis of synucleinopathies like MSA.
• Understanding α-synuclein levels in different biological fluids and tissues is crucial for diagnostic and prognostic insights.

Purpose of the Study:

• To evaluate the relationship between multiple system atrophy (MSA) and α-synuclein levels.
• To investigate α-synuclein concentrations in cerebrospinal fluid (CSF), plasma, and neural tissue of MSA patients compared to controls.

Main Methods:

• A systematic literature search was conducted across electronic databases.
• Random-effects meta-analyses were performed on standardized mean differences of α-synuclein levels.
• Meta-regression analyses examined the influence of age, gender, and disease severity.

Main Results:

• Eleven studies included 378 MSA patients and 637 controls.
• Significantly lower CSF α-synuclein levels were observed in MSA patients (SMD: -0.99, p=0.001).
• Conversely, plasma and neural tissue α-synuclein levels were significantly higher in MSA patients. Male gender positively correlated with CSF α-synuclein levels in MSA.

Conclusions:

• α-synuclein levels are significantly altered in multiple system atrophy (MSA).
• CSF α-synuclein is lower in MSA patients.
• Higher α-synuclein in plasma and neural tissue, and a positive association with male gender in CSF, are key findings.