Division of Immunology and Molecular Medicine, Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO 80045, USA; RNA Bioscience Initiative, University of Colorado School of Medicine, Aurora, CO 80045, USA.
Cell Rep. 2024 Sep 24;43(9):114724. doi: 10.1016/j.celrep.2024.114724. Epub 2024 Sep 11.
The immunosuppressive function of regulatory T (Treg) cells is essential for maintaining immune homeostasis. Enhancer of zeste homolog 2 (EZH2), a histone H3 lysine 27 (H3K27) methyltransferase, plays a key role in maintaining Treg cell function upon CD28 co-stimulation, and Ezh2 deletion in Treg cells causes autoimmunity. Here, we assess whether increasing H3K27me3 levels, by using an Ezh2 gain-of-function mutation, will improve Treg cell function. We find that Treg cells expressing Ezh2 display an effector Treg phenotype, are poised for improved homing to organ tissues, and can accelerate remission from autoimmunity. The H3K27me3 landscape and transcriptome of naive Ezh2 Treg cells exhibit a redistribution of H3K27me3 modifications that recapitulates the gene expression profile of activated Ezh2 Treg cells after CD28 co-stimulation. Altogether, increased H3K27me3 levels promote the differentiation of effector Treg cells that can better suppress autoimmunity.
调节性 T (Treg) 细胞的免疫抑制功能对于维持免疫稳态至关重要。增强子结合抑制因子 2 (EZH2) 是一种组蛋白 H3 赖氨酸 27 (H3K27) 甲基转移酶,在 CD28 共刺激下维持 Treg 细胞功能方面发挥着关键作用,而 Treg 细胞中 Ezh2 的缺失会导致自身免疫。在这里,我们评估了通过使用 Ezh2 功能获得性突变来增加 H3K27me3 水平是否会改善 Treg 细胞功能。我们发现,表达 Ezh2 的 Treg 细胞表现出效应性 Treg 表型,更倾向于向器官组织归巢,并且可以加速自身免疫的缓解。幼稚 Ezh2 Treg 细胞的 H3K27me3 图谱和转录组显示 H3K27me3 修饰的重新分布,再现了 CD28 共刺激后激活的 Ezh2 Treg 细胞的基因表达谱。总之,增加 H3K27me3 水平促进了效应性 Treg 细胞的分化,从而更好地抑制自身免疫。
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