In vivo regulation of Bcl6 and T follicular helper cell development.

In vivo regulation of Bcl6 and T follicular helper cell development.
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DOI:
10.4049/jimmunol.0904023
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发表时间:
2010-07-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Craft J
Craft J
中科院分区:
其他
文献类型:
--
作者:
Poholek AC;Hansen K;Hernandez SG;Eto D;Chandele A;Weinstein JS;Dong X;Odegard JM;Kaech SM;Dent AL;Crotty S;Craft J

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滤泡辅助性T(TFH)细胞通过表面标志物CXCR5和PD - 1的表达以及IL - 21的合成来界定,其在生发中心的B细胞成熟过程中的发育和功能需要转录抑制因子Bcl6的上调。我们已经探究了B细胞以及细胞因子IL - 6和IL - 21在体内对Bcl6表达和TFH细胞发育的调节作用。我们发现TFH细胞的特征是P - 选择素糖蛋白配体 - 1(PSGL1,一种CCL19和CCL21结合蛋白)的Bcl6依赖性下调,这表明,如同CXCR5和PD - 1的上调一样,PSGL1表达的调节是TFH细胞分化程序的一部分。B细胞对于Bcl6的初始上调以及PSGL1的下调都不是必需的,这表明这些事件发生在T - B细胞相互作用之前,尽管它们对于TFH细胞表型的充分发育(包括CXCR5和PD - 1的上调以及IL - 21的合成)是必需的。Bcl6的上调和TFH细胞的分化不依赖于IL - 6和IL - 21,这表明在体内,任何一种细胞因子对于Bcl6⁺ TFH细胞的发育都不是绝对必需的。这些数据增进了我们对TFH细胞中Bcl6调节及其在体内分化的理解,并确定了一个在该亚群中可能具有功能相关性的新的表面标志物。
Follicular helper T (TFH) cells, defined by expression of the surface markers CXCR5 and PD-1 and synthesis of IL-21, require upregulation of the transcriptional repressor Bcl6 for their development and function in B cell maturation in germinal centers. We have explored the role of B cells, and the cytokines IL-6 and IL-21, in the in vivo regulation of Bcl6 expression and TFH cell development. We found that TFH cells are characterized by a Bcl6-dependent downregulation of P-selectin glycoprotein ligand-1 (PSGL1, a CCL19- and CCL21-binding protein), indicating that, like CXCR5 and PD-1 upregulation, modulation of PSGL1 expression is part of the TFH cell program of differentiation. B cells were neither required for initial upregulation of Bcl6 nor PSGL1 downregulation, suggesting these events preceded T-B cell interactions, although they were required for full development of the TFH cell phenotype, including CXCR5 and PD-1 upregulation, and IL-21 synthesis. Bcl6 upregulation and TFH cell differentiation were independent of IL-6 and IL-21, revealing that either cytokine is not absolutely required for development of Bcl6+ TFH cells in vivo. These data increase our understanding of Bcl6 regulation in TFH cells and their differentiation in vivo, and identifies a new surface marker that may be functionally relevant in this subset.
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