Proteomic profiling of extracellular vesicles from cancer-associated fibroblast-induced myeloid-derived suppressor cells and related cell types

Cancer-associated fibroblast (CAF) promote immune suppression in the tumor microenvironment by polarizing monocytes to myeloid-derived suppressor cells (MDSC) that potently suppress T-cell function. Using a patient-derived coculture system, we found that extracellular vesicles (EV) released by CAF-induced MDSC directly suppress T-cell proliferation. In this study, we profiled the protein cargo of the EVs isolated from CAF-MDSC and compared to related cell types.