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An intrinsic role of IL-33 in Treg cell-mediated tumor immunoevasion.
Nature Immunology ( IF 27.7 ) Pub Date : 2019-12-16 , DOI: 10.1038/s41590-019-0555-2
Aikaterini Hatzioannou 1 , Aggelos Banos 1 , Theodore Sakelaropoulos 2, 3 , Constantinos Fedonidis 4 , Maria-Sophia Vidali 5 , Maren Köhne 6 , Kristian Händler 7 , Louis Boon 8 , Ana Henriques 9 , Vasiliki Koliaraki 9 , Panagiotis Georgiadis 5 , Jerome Zoidakis 10 , Aikaterini Termentzi 11 , Marc Beyer 6, 7 , Triantafyllos Chavakis 12, 13 , Dimitrios Boumpas 1, 14 , Aristotelis Tsirigos 2 , Panayotis Verginis 1, 12
Affiliation  

Regulatory T (Treg) cells accumulate into tumors, hindering the success of cancer immunotherapy. Yet, therapeutic targeting of Treg cells shows limited efficacy or leads to autoimmunity. The molecular mechanisms that guide Treg cell stability in tumors remain elusive. In the present study, we identify a cell-intrinsic role of the alarmin interleukin (IL)-33 in the functional stability of Treg cells. Specifically, IL-33-deficient Treg cells demonstrated attenuated suppressive properties in vivo and facilitated tumor regression in a suppression of tumorigenicity 2 receptor (ST2) (IL-33 receptor)-independent fashion. On activation, Il33-/- Treg cells exhibited epigenetic re-programming with increased chromatin accessibility of the Ifng locus, leading to elevated interferon (IFN)-γ production in a nuclear factor (NF)-κB-T-bet-dependent manner. IFN-γ was essential for Treg cell defective function because its ablation restored Il33-/- Treg cell-suppressive properties. Importantly, genetic ablation of Il33 potentiated the therapeutic effect of immunotherapy. Our findings reveal a new and therapeutically important intrinsic role of IL-33 in Treg cell stability in cancer.

中文翻译:

IL-33 在 Treg 细胞介导的肿瘤免疫逃逸中的内在作用。

调节性 T (Treg) 细胞在肿瘤中积累,阻碍了癌症免疫治疗的成功。然而,Treg 细胞的治疗靶向显示出有限的功效或导致自身免疫。指导肿瘤中 Treg 细胞稳定性的分子机制仍然难以捉摸。在本研究中,我们确定了警报素白介素 (IL)-33 在 Treg 细胞功能稳定性中的细胞内在作用。具体而言,IL-33 缺陷型 Treg 细胞在体内表现出减弱的抑制特性,并以不依赖致瘤性 2 受体 (ST2) (IL-33 受体) 的方式抑制肿瘤消退。激活时,Il33-/- Treg 细胞表现出表观遗传重编程,染色质对 Ifng 基因座的可及性增加,导致以核因子 (NF)-κB-T-bet 依赖性方式产生的干扰素 (IFN)-γ 增加。IFN-γ 对 Treg 细胞缺陷功能至关重要,因为它的消融恢复了 Il33-/- Treg 细胞抑制特性。重要的是,Il33 的基因消融增强了免疫疗法的治疗效果。我们的研究结果揭示了 IL-33 在癌症 Treg 细胞稳定性中的新的和治疗上重要的内在作用。
更新日期:2019-12-17
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