SUMOylation of ROR-γt inhibits IL-17 expression and inflammation via HDAC2.

SUMOylation of ROR-γt inhibits IL-17 expression and inflammation via HDAC2.
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DOI:
10.1038/s41467-018-06924-5
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发表时间:
2018-10-30
影响因子:
16.6
通讯作者:
Venuprasad K
Venuprasad K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Singh AK;Khare P;Obaid A;Conlon KP;Basrur V;DePinho RA;Venuprasad K

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ROR-γ t介导的IL-17转录失调是几种炎性疾病发病机制的核心,但在IL-17调节中控制ROR-γt转录因子活性的分子机制尚未完全确定。我们发现SUMO结合酶Ubc 9与ROR-γt中保守的GKAE基序相互作用,诱导ROR-γt的SUMO化并抑制IL-17的表达。表达SUMO化缺陷型ROR-γt的Th 17细胞在转移至Rag 1-/-小鼠后具有高度大肠杆菌性。在机制上,ROR-γt的SUMO化促进HDAC 2与IL-17启动子的结合并抑制IL-17转录。在CD 4 + T细胞中条件性缺失HDAC 2的小鼠具有升高的IL-17表达和严重的结肠炎。调控IL-17表达的Ubc 9/ROR-γt/HDAC 2轴的鉴定可能为开发炎性疾病的治疗措施开辟新途径。分泌白细胞介素-17(IL-17)的CD 4 T细胞(Th 17)由主转录因子RORγt诱导,并且对于抗真菌免疫和炎症反应是重要的。在此,作者表明Ubc 9介导的RORγt的SUMO化诱导HDAC 2与IL-17启动子结合,以抑制Th 17细胞中的IL-17产生。
Dysregulated ROR-γt-mediated IL-17 transcription is central to the pathogenesis of several inflammatory disorders, yet the molecular mechanisms that govern the transcription factor activity of ROR-γt in the regulation of IL-17 are not fully defined. Here we show that SUMO-conjugating enzyme Ubc9 interacts with a conserved GKAE motif in ROR-γt to induce SUMOylation of ROR-γt and suppress IL-17 expression. Th17 cells expressing SUMOylation-defective ROR-γt are highly colitogenic upon transfer to Rag1–/– mice. Mechanistically, SUMOylation of ROR-γt facilitates the binding of HDAC2 to the IL-17 promoter and represses IL-17 transcription. Mice with conditional deletion of HDAC2 in CD4+ T cells have elevated IL-17 expression and severe colitis. The identification of the Ubc9/ROR-γt/HDAC2 axis that governs IL-17 expression may open new venues for the development of therapeutic measures for inflammatory disorders. Interleukin-17 (IL-17)-secreting CD4 T cells (Th17) are induced by the master transcription factor RORγt, and are important for anti-fungal immunity and inflammatory responses. Here the authors show that Ubc9-mediated SUMOylation of RORγt induces HDAC2 binding to IL-17 promoter for suppressing IL-17 production in Th17 cells.
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