PKM2 Drives Hepatocellular Carcinoma Progression by Inducing Immunosuppressive Microenvironment.

PKM2 Drives Hepatocellular Carcinoma Progression by Inducing Immunosuppressive Microenvironment.
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PKM2 通过诱导免疫抑制微环境驱动肝细胞癌进展

DOI:
10.3389/fimmu.2020.589997
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发表时间:
2020
影响因子:
7.3
通讯作者:
Qin LX
Qin LX
中科院分区:
医学2区
文献类型:
--
作者:
Li TE;Wang S;Shen XT;Zhang Z;Chen M;Wang H;Zhu Y;Xu D;Hu BY;Wei R;Zheng Y;Dong QZ;Qin LX

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背景和目的丙酮酸激酶M2(PKM2)是Warburg效应的重要调节因子,但其促进肝细胞癌(HCC)免疫逃逸的生物学功能尚不清楚。方法 采用 GEPIA 网络工具和免疫组织化学 (IHC) 分析来评估 PKM2 在 HCC 患者中的临床相关性。进行体外 CCK-8、集落形成和 Transwell 测定以及体内异种移植来评估 HCC 细胞的恶性程度。通过蛋白质印迹、qRT-PCR 和 IHC 检查 PKM2 和 PD-L1 水平。还研究了 PKM2 对体内免疫反应的作用。结果 PKM2 在 HCC 中显着上调,并与 HCC 患者的不良预后相关。敲除 PKM2 可抑制 HCC 细胞的体外增殖、迁移和侵袭,以及体内肿瘤生长。引人注目的是,PKM2 与 HCC 中免疫抑制细胞因子的表达和淋巴细胞浸润密切相关。 PKM2 的过度表达使 HCC 对免疫检查点阻断敏感,从而增强了 HCC 小鼠模型中 IFN-γ 阳性 CD8 T 细胞的数量。结论 PKM2 可能是 HCC 免疫检查点抑制剂的预测因子和潜在治疗靶点。
Background and Aims Pyruvate kinase M2 (PKM2) is an essential regulator of the Warburg effect, but its biological function promoting immune escape of hepatocellular carcinoma (HCC) is unclear. Methods GEPIA web tool and immunohistochemistry (IHC) analysis were employed to evaluate the clinical relevance of PKM2 in HCC patients. Both in vitro CCK-8, colony formation, and transwell assays, and in vivo xenografts were performed to evaluate the malignancy of HCC cells. PKM2 and PD-L1 levels were examined by Western blot, qRT-PCR, and IHC. The role of PKM2 on in vivo immune response was also investigated. Results PKM2 was significantly upregulated in HCC and associated with a poor prognosis of HCC patients. Knockdown of PKM2 inhibited in vitro proliferation, migration, and invasion of HCC cells, as well as in vivo tumor growth. Strikingly, PKM2 showed a strong correlation with the expression of immune inhibitory cytokines and lymphocyte infiltration in HCC. The overexpression of PKM2 sensitized HCC to immune checkpoint blockade, which enhanced IFN-γ positive CD8 T cells in HCC mice models. Conclusion PKM2 might be a predictor and a potential therapeutic target for immune checkpoint inhibitors in HCC.
DOI: 10.1126/science.aac9935
发表时间: 2016-04-08
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影响因子: --
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SAICAR刺激丙酮酸激酶同工型M2,并在葡萄糖有限的条件下促进癌细胞的存活。
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