Cutting Edge: Hypoxia-Induced Ubc9 Promoter Hypermethylation Regulates IL-17 Expression in Ulcerative Colitis.
Cutting Edge: Hypoxia-Induced Ubc9 Promoter Hypermethylation Regulates IL-17 Expression in Ulcerative Colitis.
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DOI:
10.4049/jimmunol.2000015
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发表时间:
2021-03-01
期刊:
影响因子:
--
通讯作者:
Venuprasad K
中科院分区:
文献类型:
--
作者:
Kumar R;Singh AK;Starokadomskyy P;Luo W;Theiss AL;Burstein E;Venuprasad K
Dysregulated IL-17 expression is central to the pathogenesis of several inflammatory disorders including ulcerative colitis (UC). We have shown earlier that sumoylation of ROR-γt, the transcription factor for IL-17, regulates colonic inflammation. Here, we show that the expression of Ubc9, the E2 enzyme that targets ROR-γt for sumoylation is significantly reduced in the colonic mucosa of UC patients. Mechanistically, we demonstrate that hypoxia-inducible factor 1α (HIF-1α) binds to a CpG island within the Ubc9 gene promoter resulting in its hyper methylation and reduced Ubc9 expression. CRISPR-Cas9-mediated inhibition of HIF-1α normalized Ubc9 and attenuated IL-17 expression in Th17 cells and reduced diseases severity in Rag1−/− mice upon adoptive transfer. Collectively, our study reveals a novel epigenetic mechanism of regulation of ROR-γt which could be exploited in inflammatory diseases.
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