title: Proteomic analysis of microvesicles from plasma of healthy donors reveals high individual variability.
abstract: Healthy blood plasma is required for several therapeutic procedures. To maximize successful therapeutic outcomes it is critical to control the quality of blood plasma. Clearly initiatives to improve the safety of blood transfusions will have a high economical and social impact. A detailed knowledge of the composition of healthy blood plasma is essential to facilitate such improvements. Apart from free proteins, lipids and metabolites, blood plasma also contains cell-derived microvesicles, including exosomes and microparticles from several different cellular origins. In this study, we have purified microvesicles smaller than 220nm from plasma of healthy donors and performed proteomic, ultra-structural, biochemical and functional analyses. We have detected 161 microvesicle-associated proteins, including many associated with the complement and coagulation signal-transduction cascades. Several proteases and protease inhibitors associated with acute phase responses were present, indicating that these microvesicles may be involved in these processes. There was a remarkably high variability in the protein content of plasma from different donors. In addition, we report that this variability could be relevant for their interaction with cellular systems. This work provides valuable information on plasma microvesicles and a foundation to understand microvesicle biology and clinical implications.
authors.affiliation: LIRAD-BST, Institut d'Investigació en Ciències de la Salut Germans Trias i Pujol, Barcelona, Badalona, Spain.
authors.forename: Patricia
authors.initials: P
authors.lastname: Bastos-Amador
authors.forename: Felix
authors.initials: F
authors.lastname: Royo
authors.forename: Esperanza
authors.initials: E
authors.lastname: Gonzalez
authors.forename: Javier
authors.initials: J
authors.lastname: Conde-Vancells
authors.forename: Laura
authors.initials: L
authors.lastname: Palomo-Diez
authors.forename: Francesc E
authors.initials: FE
authors.lastname: Borras
authors.forename: Juan M
authors.initials: JM
authors.lastname: Falcon-Perez
mesh_terms: D001782:Blood Donors; D001798:Blood Proteins / Q000032:analysis* / Q000378:metabolism; D055252:Cell-Derived Microparticles; D055354:Exosomes / Q000378:metabolism*; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods*; D010449:Peptide Mapping / Q000379:methods*; D010949:Plasma / Q000737:chemistry*; D020543:Proteome / Q000032:analysis / Q000378:metabolism*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D001798:Blood Proteins; D020543:Proteome