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- W2564795955 abstract "Immunotherapy based on BCG vaccination is an effective treatment in bladder cancer, but a positive response is restricted to a subset of patients and for a limited period of time only. This suggests that T cells antitumour responses are effective but can become compromised in bladder cancer. To investigate the underlying mechanisms, we first identified peripheral blood monocytes and tumour macrophages using the pan-monocyte/macrophage marker CD14, and found that the PD-L1 expression on the monocytes/macrophages in bladder cancer patients was significantly higher than that in controls. The monocytes from bladder cancer patients were also more capable at inducing apoptosis and inhibiting proliferation in activated autologous T cells than monocytes from controls, which was directly associated with the level of PD-L1 expression. We next investigated the tumour cells' participation in upregulating PD-L1 in monocytes/macrophages. Significant elevation of PD-L1 was observed in monocytes after culturing with autologous tumour cells, which did not require direct contact but required soluble factors. The STAT phosphorylation pattern in monocytes after tumour cell co-culture was consistent with effects of the interleukin (IL)-10 signalling pathway. We then found that removal of IL-10 in monocyte-tumour cell co-culture reduced the PD-L1 upregulation in monocytes, but IL-10 by itself was unable to directly upregulate PD-L1. Primary bladder tumour cells secreted significant levels of IL-10, indicating that they could serve as the source of IL-10. Together, these results demonstrated a novel pathway that bladder cancer cells induced immunosuppression of T cells by supporting PD-L1 expression in tumour macrophages partially through IL-10." @default.
- W2564795955 created "2017-01-06" @default.
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- W2564795955 date "2017-01-06" @default.
- W2564795955 modified "2023-10-01" @default.
- W2564795955 title "Bladder cancer cells induce immunosuppression of T cells by supporting PD-L1 expression in tumour macrophages partially through interleukin 10" @default.
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- W2564795955 doi "https://doi.org/10.1002/cbin.10716" @default.
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