Exosomal PD-L1 contributes to immunosuppression and is associated with anti-PD-1 response.

Exosomal PD-L1 contributes to immunosuppression and is associated with anti-PD-1 response.
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外泌体 PD-L1 有助于免疫抑制并与抗 PD-1 反应相关

DOI:
10.1038/s41586-018-0392-8
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发表时间:
2018-08
期刊:
影响因子:
64.8
通讯作者:
Guo W
Guo W
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chen G;Huang AC;Zhang W;Zhang G;Wu M;Xu W;Yu Z;Yang J;Wang B;Sun H;Xia H;Man Q;Zhong W;Antelo LF;Wu B;Xiong X;Liu X;Guan L;Li T;Liu S;Yang R;Lu Y;Dong L;McGettigan S;Somasundaram R;Radhakrishnan R;Mills G;Lu Y;Kim J;Chen YH;Dong H;Zhao Y;Karakousis GC;Mitchell TC;Schuchter LM;Herlyn M;Wherry EJ;Xu X;Guo W

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肿瘤细胞通过上调程序性死亡配体1(PD-L1)的表面表达来逃避免疫监视,所述程序性死亡配体1与T细胞上的程序性死亡-1(PD-1)受体相互作用以引发免疫检查点应答。抗PD-1抗体在治疗肿瘤(包括转移性黑色素瘤)方面显示出了显着的前景。然而,患者的反应率很低。需要更好地了解PD-L1介导的免疫逃避,以预测患者的反应并提高治疗效果。在这里,我们报告了转移性黑色素瘤释放细胞外囊泡,主要以外泌体的形式,在其表面携带PD-L1。干扰素-γ(IFN-γ)刺激增加了这些囊泡上PD-L1的量,这抑制了CD 8 T细胞的功能并促进了肿瘤生长。在转移性黑色素瘤患者中,循环外泌体PD-L1水平与IFN-γ水平正相关,并且在抗PD-1治疗过程中发生变化。在治疗的早期阶段,作为肿瘤细胞对T细胞复苏的适应性反应的指标,循环外泌体PD-L1的增加幅度将临床反应者与非反应者分层。我们的研究揭示了肿瘤细胞系统性抑制免疫系统的机制,并为外泌体PD-L1作为抗PD-1治疗的预测因子的应用提供了理论基础。
Tumour cells evade immune surveillance by upregulating the surface expression of programmed death-ligand 1 (PD-L1), which interacts with programmed death-1 (PD-1) receptor on T cells to elicit the immune checkpoint response,. Anti-PD-1 antibodies have shown remarkable promise in treating tumours, including metastatic melanoma, –. However, the patient response rate is low,. A better understanding of PD-L1-mediated immune evasion is needed to predict patient response and improve treatment efficacy. Here we report that metastatic melanomas release extracellular vesicles, mostly in the form of exosomes, that carry PD-L1 on their surface. Stimulation with interferon-γ (IFN-γ) increases the amount of PD-L1 on these vesicles, which suppresses the function of CD8 T cells and facilitates tumour growth. In patients with metastatic melanoma, the level of circulating exosomal PD-L1 positively correlates with that of IFN-γ, and varies during the course of anti-PD-1 therapy. The magnitudes of the increase in circulating exosomal PD-L1 during early stages of treatment, as an indicator of the adaptive response of the tumour cells to T cell reinvigoration, stratifies clinical responders from non-responders. Our study unveils a mechanism by which tumour cells systemically suppress the immune system, and provides a rationale for the application of exosomal PD-L1 as a predictor for anti-PD-1 therapy.
头颈癌患者血浆中 PD-L1(+) 外泌体的临床意义。
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