Mesenchymal stem cell-derived exosome surface and extracellular targets (MSC-Exo targets)

Mesenchymal stem cell-derived exosomes (MSC-Exos) are a class of extracellular vesicles that serve as critical mediators of paracrine signaling, carrying a diverse payload of proteins, lipids, and nucleic acids (Signal Transduct Target Ther. 2020; 5: 202). The cell-surface and extracellular targets of these exosomes include a variety of receptors and matrix components on recipient cells, such as toll-like receptors, integrins, and cytokine receptors, which facilitate vesicle docking and internalization (Journal of Nanobiotechnology, 2021). By interacting with these targets, MSC-Exos can modulate key intracellular pathways, including the PI3K/Akt and MAPK/ERK cascades, to promote tissue repair and suppress inflammatory responses (Frontiers in Cell and Developmental Biology, 2021). In clinical research, these interactions are being leveraged to develop cell-free therapies for conditions like myocardial infarction, osteoarthritis, and acute kidney injury. The surface of MSC-Exos is characterized by specific markers such as tetraspanins (CD63, CD81, CD9) and MSC-associated proteins (CD73, CD90), which are essential for their biological activity and targeting specificity (Pharmaceutics, 2022). However, the complexity and heterogeneity of these surface interactions present significant challenges for standardization and targeted delivery in a therapeutic context. Furthermore, while generally considered safe, the potential for MSC-Exos to promote tumor growth or induce unwanted immune responses remains a subject of ongoing investigation (Frontiers in Oncology, 2020).

Other names

MSC-ExosMSC-EVsMesenchymal stem cell-derived extracellular vesiclesMSC-derived exosomal surface proteins

MSC-derived exosomes interact with extracellular targets via ligand-receptor binding, direct membrane fusion, and endocytosis to deliver bioactive cargo (miRNAs, proteins, lipids) that modulates recipient cell signaling pathways such as PI3K/Akt, MAPK/ERK, and NF-kB.