Gcn5 is required for PU.1-dependent IL-9 induction in Th9 cells.

Gcn5 is required for PU.1-dependent IL-9 induction in Th9 cells.
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DOI:
10.4049/jimmunol.1201496
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发表时间:
2012-09-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Kaplan MH
Kaplan MH
中科院分区:
其他
文献类型:
--
作者:
Goswami R;Kaplan MH

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幼稚CD 4 +T细胞分化成各种效应T辅助细胞亚群,这取决于它们遇到的抗原和细胞因子微环境。分泌IL-9的Th 9细胞是最近描述的辅助性T细胞亚群。PU.1是Th 9细胞发育所需的转录因子之一,与Il 9基因结合。在这项研究中,我们表明,PU.1通过与组蛋白乙酰转移酶(HAT)的直接相互作用增加组蛋白乙酰化在Il 9位点。在不存在PU.1的情况下,在Th 9细胞中,在Il 9基因座处存在Gcn 5和PCAF的降低的关联,以及HDAC的增加的关联。抑制组蛋白脱乙酰酶活性可增加PU.1依赖性IL-9的产生。PU.1与Gcn 5形成复合物,并且抑制Gcn 5的表达导致IL-9产生减少。此外,Gcn 5对IL-9产生的影响是特异性的,因为IL-10和IL-21(Th 9细胞产生的两种额外的细胞因子)的产生在Gcn 5表达降低后不改变。总之,这些数据定义了Th 9细胞中组蛋白乙酰化和Il 9基因座表达改变的PU.1依赖性机制。
Naïve CD4+T cells differentiate into various effector T helper subsets depending on the antigens and cytokine microenvironment they encounter. IL-9-secreting Th9 cells are the most recent T helper subset to be described. PU.1, one of the transcription factors required for the development of Th9 cells, binds to the Il9 gene. In this study we show that PU.1 increases histone acetylation at the Il9 locus through direct interactions with histone acetyltransferases (HAT). In the absence of PU.1, there is decreased association of Gcn5 and PCAF, and increased association of HDACs at the Il9 locus in Th9 cells. Inhibiting histone deacetylase activity augments PU.1-dependent IL-9 production. PU.1 forms a complex with Gcn5, and inhibiting the expression of Gcn5 results in reduced IL-9 production. Moreover, the effects of Gcn5 on IL-9 production are specific as the production of IL-10 and IL-21, two additional cytokines produced by Th9 cells, is not altered following decreased Gcn5 expression. Together, these data define a PU.1-dependent mechanism for altered histone acetylation and expression of the Il9 locus in Th9 cells.
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