Extracellular vesicles (EVs) play a pivotal role in various disease mechanisms, particularly in autoimmune and chronic diseases. For instance, a study demonstrated that mesenchymal stromal cells (MSCs) induce a significant increase in neutrophil aggregation and the release of EVs in systemic lupus erythematosus (SLE). The blockade of this EV storm was shown to abolish the therapeutic effects of MSCs, indicating that the EV storm can serve as a predictive marker for therapeutic efficacy in SLE patients (ref: Ou doi.org/10.1038/s41392-025-02442-1/). Similarly, in rheumatoid arthritis, engineered apoptotic EVs were developed to regulate the pathogenic axis involving neutrophils and macrophages, showcasing a novel approach to reconstruct the rheumatoid arthritis microenvironment and improve therapeutic outcomes (ref: Kang doi.org/10.1002/adma.202508072/). Furthermore, hepatocyte-derived EVs were found to promote endothelial dedifferentiation in chronic liver disease through specific miRNA pathways, highlighting the complex interplay between EVs and disease progression (ref: Abad-Jordà doi.org/10.1097/HEP.0000000000001567/). These studies collectively emphasize the multifaceted roles of EVs in mediating disease mechanisms and their potential as therapeutic targets or biomarkers. In cancer research, engineered dendritic cell progenitors expressing EV-internalizing receptors significantly enhanced cancer immunotherapy efficacy in mouse models. This approach facilitates the internalization of tumor-derived antigens, thereby improving the immune response against tumors (ref: Ghasemi doi.org/10.1038/s41467-025-64172-w/). Additionally, engineered neural stem cell-derived EVs activating Wnt signaling were shown to promote blood-brain barrier repair after cerebral hemorrhage, indicating their therapeutic potential in neurological disorders (ref: Li doi.org/10.1093/brain/). The heterogeneity of EVs, particularly in glioblastoma, was also explored, revealing distinct lipid and protein signatures that correlate with tumor characteristics, thus providing insights into their roles in cancer biology (ref: Xu doi.org/10.1002/jev2.70168/). Overall, the research underscores the diverse functions of EVs in disease mechanisms, suggesting their utility in diagnostics and therapy.