Guidance of super-enhancers in regulation of IL-9 induction and airway inflammation.

Guidance of super-enhancers in regulation of IL-9 induction and airway inflammation.
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DOI:
10.1084/jem.20170928
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发表时间:
2018-02-05
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Li XC
Li XC
中科院分区:
其他
文献类型:
--
作者:
Xiao X;Fan Y;Li J;Zhang X;Lou X;Dou Y;Shi X;Lan P;Xiao Y;Minze L;Li XC

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Xiao等人证明,在Il 9基因座处形成超级增强子对于稳健的IL-9表达和Th 9细胞诱导是关键的,并且Il 9超级增强子的组装由0X 40介导的染色质乙酰化驱动。Th 9细胞在过敏性肺部炎症中具有显著特征,但调节T辅助细胞中IL-9诱导的机制仍然不清楚。在这里,我们证明了超级增强子(SE)的形成在IL-9的稳健诱导中是至关重要的,并且Th细胞中的Il 9 SE的组装需要OX 40触发的染色质乙酰化。从机制上讲,我们发现OX 40共刺激诱导RelB表达,其将组蛋白乙酰转移酶p300募集到Il 9位点以催化H3 K27乙酰化。这允许SE因子Brd 4的结合以组织SE复合物的组装,这进而驱动稳健的IL-9表达和Th 9细胞诱导。因此,Th 9细胞在OX 40刺激后被强烈诱导,并且SE的破坏在体外消除了Th 9细胞诱导,并在体内抑制了Th 9细胞介导的过敏性气道炎症。总之,我们的数据表明SE的形成在IL-9表达和Th 9细胞诱导中是必需的。这些发现可能具有重要的临床意义。
Xiao et al. demonstrate that formation of super-enhancers at Il9 locus is critical for robust IL-9 expression and Th9 cell induction, and assembly of Il9 super-enhancers is driven by OX40-mediated chromatin acetylation. Th9 cells are prominently featured in allergic lung inflammation, but the mechanism that regulates IL-9 induction in T helper cells remains poorly defined. Here we demonstrate that formation of super-enhancers (SEs) is critical in robust induction of IL-9 and that assembly of the Il9 SEs in Th cells requires OX40-triggered chromatin acetylation. Mechanistically, we found that OX40 costimulation induces RelB expression, which recruits the histone acetyltransferase p300 to the Il9 locus to catalyze H3K27 acetylation. This allows binding of the SE factor Brd4 to organize assembly of the SE complex, which in turn drives robust IL-9 expression and Th9 cell induction. Thus, Th9 cells are strongly induced upon OX40 stimulation, and disruption of SEs abolished Th9 cell induction in vitro and inhibited Th9 cell–mediated allergic airway inflammation in vivo. Together, our data suggest that formation of SEs is essential in IL-9 expression and Th9 cell induction. These findings may have important clinical implications.
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