Cerebrospinal Fluid-Derived Extracellular Vesicles: A Proteomic and Transcriptomic Comparative Analysis of Enrichment...

Area of Science:

• Neuroscience
• Biochemistry
• Molecular Biology

Background:

• Cerebrospinal fluid (CSF)-derived extracellular vesicles (EVs) are crucial for understanding central nervous system (CNS) diseases.
• EVs may serve as biomarkers, but standardized isolation methods are lacking.
• Limited comparative studies exist for CSF EV enrichment protocols.

Purpose of the Study:

• To compare the yield and purity of four different CSF EV enrichment protocols.
• To characterize the proteomic and transcriptomic profiles of enriched EVs.
• To identify potential CSF-derived EV biomarkers.

Main Methods:

• Four distinct EV enrichment protocols were applied to a large CSF pool.
• Characterization included morphological and biochemical analysis.
• Proteomic and transcriptomic analyses were performed on EV preparations.

Main Results:

• Ultracentrifugation (UC) and ultrafiltration-size exclusion chromatography (UF-SEC) yielded particles with small EV characteristics.
• UF-SEC preparations showed higher particle yields.
• UC preparations yielded a greater number of identified proteins.
• A core proteome of 45 proteins was identified across multiple experiments, suggesting potential CSF-derived EV markers.
• UF-SEC preparations had higher enrichment scores for contaminants like albumin and apolipoprotein E.

Conclusions:

• All tested protocols enriched for small EV characteristics.
• UF-SEC provided the highest yield and purity of CSF EVs.
• The identified core proteome may offer valuable CSF-derived EV biomarkers for CNS disease research.