BCL6 controls Th9 cell development by repressing Il9 transcription.

BCL6 controls Th9 cell development by repressing Il9 transcription.
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DOI:
10.4049/jimmunol.1303184
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发表时间:
2014-07-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Elyaman W
Elyaman W
中科院分区:
其他
文献类型:
--
作者:
Bassil R;Orent W;Olah M;Kurdi AT;Frangieh M;Buttrick T;Khoury SJ;Elyaman W

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转录抑制因子B细胞淋巴瘤6(BCL 6)是T辅助(Th)滤泡细胞发育所需的,并且已显示其抑制Th 2细胞分化。我们证明BCL 6是Th 9细胞发育的关键调节因子。BCL 6表达在极化的Th 9细胞中瞬时下调,并且BCL 6在Th 9细胞中的强制表达损害Th 9细胞分化。相反,BCL 6敲低上调Th 9细胞中白细胞介素(IL)-9的产生。BCL 6在Th 9细胞中的功能受IL-2/Janus激酶3(JAK 3)/信号转导和转录激活因子5(STAT 5)信号通路的调控。使用染色质免疫沉淀(ChIP),我们表明,在Th 9细胞,BCL 6和STAT 5结合到相邻的图案在IL 9启动子。此外,我们发现STAT 5结合与Il 9启动子处的容许组蛋白标记的丰度相关,而在BCL 6结合占主导地位的条件下,抑制性组蛋白标记是普遍的。使用IL-9-荧光素酶报告基因测定进一步证明了STAT 5和BCL 6对IL-9转录的影响,其中BCL 6抑制STAT 5介导的IL-9反式激活。在实验性自身免疫性脑脊髓炎(EAE)中,髓鞘少突胶质细胞糖蛋白(MOG)35-55特异性Th 9细胞中BCL 6的强制表达导致IL-9产生减少和IFNγ诱导,从而引起临床疾病的恶化。我们的研究结果表明BCL 6在调节Th 9细胞发育及其致脑炎性中的新作用。
The transcriptional repressor B-cell lymphoma 6 (BCL6) is required for the development of T helper (Th) follicular cells and it has been shown to suppress Th2 cell differentiation. We demonstrate that BCL6 is a key regulator of Th9 cell development. BCL6 expression is transiently downregulated in polarized Th9 cells and forced expression of BCL6 in Th9 cells impairs Th9 cell differentiation. In contrast, BCL6 knockdown up-regulated interleukin (IL)-9 production in Th9 cells. The function of BCL6 in Th9 cells is under the control of IL-2/Janus kinase 3 (JAK3)/signal transducer and activator of transcription 5 (STAT5) signaling pathway. Using chromatin immunoprecipitation (ChIP), we show that in Th9 cells, BCL6 and STAT5 bind to adjacent motifs in the Il9 promoter. Furthermore, we found that STAT5 binding was associated with the abundance of a permissive histone mark at the Il9 promoter, while under conditions where BCL6 binding was predominant a repressive histone mark was prevalent. The effects of STAT5 and BCL6 on IL-9 transcription were further demonstrated using an IL-9-luciferase reporter assay where BCL6 repressed STAT5-mediated Il9 transactivation. In experimental autoimmune encephalomyelitis (EAE), forced expression of BCL6 in myelin oligodendrocyte glycoprotein (MOG)35–55-specific Th9 cells resulted in decreased IL-9 production and induction of IFNγ causing an exacerbation of the clinical disease. Our findings demonstrate a novel role of BCL6 in the regulation of Th9 cell development and their encephalitogenicity.
T-BET的丧失,但不是STAT1阻止了实验性自身免疫性脑脊髓炎的发展。
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