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- W3037519998 abstract "The five-year survival rate of melanoma worsens significantly with advancing tumor stage. We hypothesized that regulatory B cells (Breg) might have participated in the pathogenesis of melanoma. In this study, the PD-L1+ Breg cells were investigated. The expression of PD-L1 by circulating B cells was very low in healthy controls. In melanoma patients, on the other hand, the expression of PD-L1 by circulating B cells was significantly elevated in a manner that was positively associated with tumor stage, with the highest level in stage IV bone metastasis patients. Compared to total B cells, PD-L1+ B cells presented higher IgM and higher IgD expression, and were almost exclusively CD20+CD27−, suggesting that the PD-L1+ B cells exhibited a naive B cell-like phenotype. Healthy naive B cells, which presented little PD-L1, and stage I and stage II melanoma patient naive B cells, which presented detectable but low PD-L1, were unable to suppress T cell response. However, stage III and stage IV naive B cells, which presented moderate PD-L1, could significantly suppress T cell response in a PD-L1-dependent manner. We further found that the level of PD-L1+ B cells was significantly higher in bone metastasis than in the primary tumors. Overall, we demonstrated that PD-L1+ B cells were upregulated in advanced melanoma and were enriched in metastasis compared to primary tumors. Furthermore, PD-L1+ naive B cells could act as a T cell suppressor in a PD-L1-dependent manner." @default.
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- W3037519998 date "2020-03-01" @default.
- W3037519998 modified "2023-10-14" @default.
- W3037519998 title "PD-L1+ regulatory B cells act as a T cell suppressor in a PD-L1-dependent manner in melanoma patients with bone metastasis" @default.
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- W3037519998 doi "https://doi.org/10.1016/j.molimm.2020.01.008" @default.
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