Journal
JOURNAL OF EXTRACELLULAR VESICLES
Volume 8, Issue 1, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/20013078.2019.1568780
Keywords
Extracellular vesicles; stem cell; Raman spectroscopy; size exclusion chromatography; ultracentrifugation; regenerative medicine
Categories
Funding
- Italian Ministry of Health
- People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013/[REA grant] [612224: EVEStemInjury]
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Extracellular vesicles (EVs) from a variety of stem cell sources are believed to harbour regenerative capacity, which may be exploited for therapeutic purposes. Because of EV interaction with other soluble secreted factors, EV activity may depend on the employed purification method, which limits cross-study comparisons and therapeutic development. Raman spectroscopy (RS) is a quick and easy method to assess EV purity and composition, giving in-depth biochemical overview on EV preparation. Hereby, we show how this method can be used to characterise EVs isolated from human liver stem cells and bone marrow mesenchymal stem/stromal cells by means of conventional ultracentrifugation (UC) and size exclusion chromatography (SEC) protocols. The obtained EV preparations were demonstrated to be characterised by different degrees of purity and a specific Raman fingerprint that represents both the cell source and the isolation procedure used. Moreover, RS provided useful hints to explore the factors underlying the functional diversity of EV preparations from the same cell source, thus representing a valuable tool to assess EV quality prior to functional assays or therapeutic application.
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