研究揭示CD8+T細胞代謝與腫瘤免疫機制
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小柯機器人發布時間:2019/8/7 16:00:38
上海交通大學醫學院鄒強/劉俊嶺/蘇冰課題組,發現了醯基甘油激酶(AGK)可維持CD8+T細胞的代謝狀態和免疫反應。 2019年8月,國際學術期刊《細胞—代謝》發表了這一成果。
該課題組研究人員發現,AGK在建立和維持CD8+T細胞的代謝和抗腫瘤功能中是必不可少的。AGK缺乏會抑制CD8+T細胞體內抗腫瘤和體外增殖的功能。磷脂醯肌醇-3-羥基激酶(PI3K)-哺乳動物雷帕黴素靶蛋白(mTOR)信號通路的激活可增強CD8+T細胞的糖酵解水平,且與AGK激酶活性密切相關。作用機制上,T細胞受體(TCR)和CD28刺激PTEN在細胞質膜處聚集,促進了AGK-PTEN結合及AGK介導的PTEN磷酸化,從而限制了PTEN磷酸酶在CD8+T細胞中的活性。這些結果表明,AGK通過抑制PTEN活性維持CD8+T細胞的代謝和抗腫瘤功能。
據悉,CD8+T細胞的擴增和功能發揮依賴於糖酵解途徑,但CD8+T細胞糖酵解代謝的機制仍不清楚。
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研究人員介紹,該項研究不僅揭示了CD8+ T細胞內部PTEN沉默機制,而且首次闡述了醯基甘油激酶AGK介導腫瘤免疫應答的糖代謝機制,提示了靶向增強AGK活性可能有效增強CD8+ T細胞抗腫瘤功能,為提高腫瘤免疫監測點單抗療效提供新的策略。(據上海交通大學醫學院上海市免疫學研究所)
附:英文原文
Title: Acylglycerol Kinase Maintains Metabolic State and Immune Responses of CD8+ T Cells
Author: Zhilin Hu, Guojun Qu, Xiaoyan Yu, Haojie Jiang, Xiao-Lu Teng, Lei Ding, Qianwen Hu, Xinwei Guo, Yan Zhou, Feng Wang, Hua-Bing Li, Lei Chen, Jin Jiang, Bing Su, Junling Liu, Qiang Zou
Issue&Volume:Volume 30 Issue 2
Abstract: CD8 + T cell expansions and functions rely on glycolysis, but the mechanisms underlying CD8 + T cell glycolytic metabolism remain elusive. Here, we show that acylglycerol kinase (AGK) is required for the establishment and maintenance of CD8 + T cell metabolic and functional fitness. AGK deficiency dampens CD8 + T cell antitumor functions in vivo and perturbs CD8 + T cell proliferation in vitro. Activation of phosphatidylinositol-3-OH kinase (PI3K)-mammalian target of rapamycin (mTOR) signaling, which mediates elevated CD8 + T cell glycolysis, is tightly dependent on AGK kinase activity. Mechanistically, T cell antigen receptor (TCR)- and CD28-stimulated recruitment of PTEN to the plasma membrane facilitates AGK-PTEN interaction and AGK-triggered PTEN phosphorylation, thereby restricting PTEN phosphatase activity in CD8 + T cells. Collectively, these results demonstrate that AGK maintains CD8 + T cell metabolic and functional state by restraining PTEN activity and highlight a critical role for AGK in CD8 + T cell metabolic programming and effector function.
DOI: https://doi.org/10.1016/j.cmet.2019.05.016
Source: https://www.cell.com/cell-metabolism/fulltext/S1550-4131(19)30256-6