PD-L1 co-stimulation contributes to ligand-induced T cell receptor down-modulation on CD8+ T cells.

PD-L1 co-stimulation contributes to ligand-induced T cell receptor down-modulation on CD8+ T cells.
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DOI:
10.1002/emmm.201100165
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发表时间:
2011-10
影响因子:
11.1
通讯作者:
Escors, David
Escors, David
中科院分区:
医学1区
文献类型:
--
作者:
Karwacz, Katarzyna;Bricogne, Christopher;MacDonald, Douglas;Arce, Frederick;Bennett, Clare L.;Collins, Mary;Escors, David

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T cell receptor (TCR) down-modulation after antigen presentation is a fundamental process that regulates TCR signal transduction. Current understanding of this process is that intrinsic TCR/CD28 signal transduction leads to TCR down-modulation. Here, we show that the interaction between programmed cell death 1 ligand 1 (PD-L1) on dendritic cells (DCs) and programmed death 1 (PD-1) on CD8 T cells contributes to ligand-induced TCR down-modulation. We provide evidence that this occurs via Casitas B-lymphoma (Cbl)-b E3 ubiquitin ligase up-regulation in CD8 T cells. Interference with PD-L1/PD-1 signalling markedly inhibits TCR down-modulation leading to hyper-activated, proliferative CD8 T cells as assessed in vitro and in vivo in an arthritis model. PD-L1 silencing accelerates anti-tumour immune responses and strongly potentiates DC anti-tumour capacities, when combined with mitogen-activated kinase (MAPK) modulators that promote DC activation.
旧CD8+ T细胞上的B7-H1表达对老年动物的免疫反应的激活负调节。
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