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Improved Characterization of EV Preparations Based on Protein to Lipid Ratio and Lipid Properties

XabierOsteikoetxea1, AndreaBalogh2, KatalinSzabó-Taylor1, AndreaNémeth1, Tamás GézaSzabó1, KrisztinaPálóczi1, BarbaraSódar1, ÁgnesKittel3, BenceGyörgy4,1, ÉvaPállinger1, JánosMatkó2, EditIrénBuzás1

PLOSONE|DOI:10.1371/journal.pone.0121184 March23,2015
In recent years the study of extracellular vesicles has gathered much scientific and clinical interest. As the field is expanding, it is becoming clear that better methods for characterization and quantification of extracellular vesicles as well as better standards to compare studies are warranted. The goal of the present work was to find improved parameters to characterize extracellular vesicle preparations. Here we introduce a simple 96 well plate-based total lipid assay for determination of lipid content and protein to lipid ratios of extracellular vesicle preparations from various myeloid and lymphoid cell lines as well as blood plasma. These preparations included apoptotic bodies, microvesicles/microparticles, and exosomes isolated by size-based fractionation. We also investigated lipid bilayer order of extracellular vesicle subpopulations using Di-4-ANEPPDHQ lipid probe, and lipid composition using affinity reagents to clustered cholesterol (monoclonal anti-cholesterol antibody) and gangliosid
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