Ewing Sarcoma (EwS) is a non-T cell-inflamed, pediatric bone and soft tissue tumor with high metastatic capacity. Here, we show that EwS extracellular vesicles (EVs) elicit a pro-inflammatory response in CD14+ and CD33+ myeloid cells and impair their maturation and stimulatory function. In parallel, EwS EVs upregulated endogenous retroelements and satellite repeats in myeloid cells. Therefore, EwS EVs may pathologically activate myeloid cells in the blood and the tumor microenvironment promoting tumor-infiltrating immunosuppressive myeloid cells in EwS patients.
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Ewing Sarcoma (EwS) is a non-T cell-inflamed, pediatric bone and soft tissue tumor with high metastatic capacity. Here, we show that EwS extracellular vesicles (EVs) elicit a pro-inflammatory response in CD14+ and CD33+ myeloid cells and impair their maturation and stimulatory function. In parallel, EwS EVs upregulated endogenous retroelements and satellite repeats in myeloid cells. Therefore, EwS EVs may pathologically activate myeloid cells in the blood and the tumor microenvironment promoting...
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