Proteomics Profiling of Neuron-Derived Small Extracellular Vesicles from Human Plasma: Enabling Single-Subject...

Area of Science:

• Neuroscience
• Biochemistry
• Proteomics

Background:

• Small extracellular vesicles (sEVs) are studied as biomarkers for neurodegenerative disorders.
• Neuron-derived sEVs (NDsEVs) in blood offer insights into brain pathology.
• Current methods lack sensitivity for NDsEV isolation and proteome characterization in individual patients.

Purpose of the Study:

• To develop a rapid method for isolating and characterizing plasma NDsEVs from individual Parkinson's disease (PD) patients.
• To explore the proteome of NDsEVs for potential PD biomarkers.

Main Methods:

• Utilized an immunoplate coated with anti-L1CAM antibody for NDsEV isolation.
• Employed liquid chromatography-tandem mass spectrometry (LC-MS/MS) for proteome characterization.
• Analyzed isolated vesicles for morphological characteristics consistent with exosomes.

Main Results:

• Successfully isolated and characterized plasma NDsEVs from individual PD patients.
• Identified an average of 349 ± 38 protein groups per sample.
• Found 20 proteins highly expressed in the brain and 213 shared with neuronal NDsEVs.
• Detected 23 proteins linked to the Parkinson's disease KEGG pathway and known PD biomarkers.

Conclusions:

• The developed method enables sensitive isolation and proteome profiling of plasma NDsEVs.
• This approach facilitates the identification of potential PD biomarkers from blood.
• The findings support the use of NDsEVs as a diagnostic tool for neurodegenerative diseases.