β-Catenin induces transcriptional expression of PD-L1 to promote glioblastoma immune evasion.

β-Catenin induces transcriptional expression of PD-L1 to promote glioblastoma immune evasion.
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β-Catenin 诱导 PD-L1 转录表达促进胶质母细胞瘤免疫逃避

DOI:
10.1084/jem.20191115
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发表时间:
2020-11-02
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Lyu J
Lyu J
中科院分区:
其他
文献类型:
--
作者:
Du L;Lee JH;Jiang H;Wang C;Wang S;Zheng Z;Shao F;Xu D;Xia Y;Li J;Zheng Y;Qian X;Li X;Kim HR;Xing D;Liu P;Lu Z;Lyu J

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PD-L1在癌症中的上调有助于肿瘤细胞的免疫逃避。我们的发现揭示了依赖AKT的β-连环蛋白激活诱导PD-L1上调的一个重要机制,并强调了β-连环蛋白激活在肿瘤免疫逃逸中的临床意义。PD-L1在癌症中的上调有助于肿瘤细胞的免疫逃避。在这里,我们发现Wnt配体和激活的EGFR诱导β-catenin/Tcf/Lef复合体与CD274基因启动子区域的结合,从而诱导PD-L1的表达,其中AKT的激活起着重要作用。β-连环蛋白缺失、AKT抑制或PTEN表达降低了肿瘤细胞中PD-L1的表达,增强了CD8+T细胞的活化和肿瘤的侵袭,抑制了肿瘤的生长,同时延长了小鼠的生存时间。临床上可用的AKT抑制剂和抗PD-1抗体的联合治疗克服了肿瘤免疫逃避,并极大地抑制了肿瘤的生长。此外,AKT介导的β-连环蛋白S552磷酸化和核β-连环蛋白与PD-L1的表达呈正相关,与肿瘤组织中CD8+T细胞的侵袭呈负相关,凸显了β-连环蛋白活化在肿瘤免疫逃逸中的临床意义。
PD-L1 up-regulation in cancer contributes to immune evasion by tumor cells. Our findings reveal an important mechanism of PD-L1 up-regulation elicited by AKT-dependent β-catenin activation and highlight the clinical significance of β-catenin activation in tumor immune evasion. PD-L1 up-regulation in cancer contributes to immune evasion by tumor cells. Here, we show that Wnt ligand and activated EGFR induce the binding of the β-catenin/TCF/LEF complex to the CD274 gene promoter region to induce PD-L1 expression, in which AKT activation plays an important role. β-Catenin depletion, AKT inhibition, or PTEN expression reduces PD-L1 expression in tumor cells, enhances activation and tumor infiltration of CD8+ T cells, and reduces tumor growth, accompanied by prolonged mouse survival. Combined treatment with a clinically available AKT inhibitor and an anti–PD-1 antibody overcomes tumor immune evasion and greatly inhibits tumor growth. In addition, AKT-mediated β-catenin S552 phosphorylation and nuclear β-catenin are positively correlated with PD-L1 expression and inversely correlated with the tumor infiltration of CD8+ T cells in human glioblastoma specimens, highlighting the clinical significance of β-catenin activation in tumor immune evasion.
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