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Abstract Extracellular vesicles (EVs) are present in biofluids and may be useful biomarkers to non-invasively monitor brain cells, but isolating cell type-specific EVs remains challenging. Here we introduce an approach to immuno-isolate EVs from neurons and glia based on protein surface markers. We first selected transmembrane proteins suitable as cell type-specific EV markers based on gene expression and EV proteomic data.
Abstract L1CAM is a transmembrane protein expressed on neurons that was presumed to be found on neuron-derived extracellular vesicles (NDEVs) in human biofluids. We developed a panel of single-molecule array assays to evaluate the use of L1CAM for NDEV isolation. We demonstrate that L1CAM is not associated with extracellular vesicles in human plasma or cerebrospinal fluid and therefore recommend against its use as a marker in NDEV isolation protocols.
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