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- W2971235103 abstract "Abstract Radiotherapy induces immune-related responses in cancer patients by various mechanisms. Here, we investigate the immunomodulatory role of tumor-derived microparticles (TMPs)—extracellular vesicles shed from tumor cells—following radiotherapy. We demonstrate that breast carcinoma cells exposed to radiation shed TMPs containing elevated levels of immune-modulating proteins, one of which is programmed death-ligand 1 (PD-L1). These TMPs inhibit cytotoxic T lymphocyte (CTL) activity both in vitro and in vivo, and thus promote tumor growth. Evidently, adoptive transfer of CTLs pre-cultured with TMPs from irradiated breast carcinoma cells increases tumor growth rates in mice recipients in comparison with control mice receiving CTLs pre-cultured with TMPs from untreated tumor cells. In addition, blocking the PD-1-PD-L1 axis, either genetically or pharmacologically, partially alleviates TMP-mediated inhibition of CTL activity, suggesting that the immunomodulatory effects of TMPs in response to radiotherapy is mediated, in part, by PD-L1. Overall, our findings provide mechanistic insights into the tumor immune surveillance state in response to radiotherapy and suggest a therapeutic synergy between radiotherapy and immune checkpoint inhibitors." @default.
- W2971235103 created "2019-09-05" @default.
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- W2971235103 date "2019-08-29" @default.
- W2971235103 modified "2023-10-18" @default.
- W2971235103 title "Microparticles from tumors exposed to radiation promote immune evasion in part by PD-L1" @default.
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- W2971235103 doi "https://doi.org/10.1038/s41388-019-0971-7" @default.
- W2971235103 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6937213" @default.
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- W2971235103 hasPublicationYear "2019" @default.
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