The objective of the present study was to conduct a comparative material analysis of EV secreted into a liquid medium versus MBV integrated into the ECM using an in vitro 3T3 fibroblast cell culture model that allows selective harvesting of vesicles from liquid-phase or solid-phase extracellular compartments. 3T3 fibroblasts were seeded on polystyrene plates in the presence of ascorbic acid to induce deposition of ECM (41, 42). After 7 days, the cell culture medium containing liquid-phase EV was harvested, and the culture plates were decellularized to remove cells while maintaining the molecular composition and ultrastructure of the ECM. Following decellularization, MBVs were isolated from decellularized ECM by enzymatic digestion. We used LC-MS–based lipidomics and redox lipidomics to perform detailed analysis of liquid-phase EV and MBV phospholipids and conducted comprehensive RNA-seq and bioinformatic analysis of the intravesicular miRNA cargo.

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