Plasma-derived EV characterizzation. (A) Plasma derived EV purification protocol. (B) Dynamic light scatter analyses of particle size and concentration of plasma derived EV before (pre-MI) and after (post-MI) myocardial infarction (n=5 repeated measurements of 5 different plasma samples per group), red lines represent standard deviations. (C) Western blot analysis of specific exosomal markers TSG101, CD63 and CD81. (D) Quantification of plasma derived EV cytotoxicity on rat primary neonatal cardiomyocytes. n=4 independent experiments treated with 4 different pools of EV. Left panels are representative images of viability assay for the conditions without EV (w/o EV), EV derived from plasma before (EV pre-MI) and after (EV post-MI) myocardial infarction.Viable cells stain green, dead cells red. All data are presented as mean ± SEM and analyzed by one-way analyses of variance-ANOVA with post-hoc multiple comparisons using the Bonferroni correction (**p < 0.01). Mean, SEM and statistics are reported in full in Table S1.