ICOS receptor instructs T follicular helper cell versus effector cell differentiation via induction of the transcriptional repressor Bcl6.

ICOS receptor instructs T follicular helper cell versus effector cell differentiation via induction of the transcriptional repressor Bcl6.
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DOI:
10.1016/j.immuni.2011.03.023
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发表时间:
2011-06-24
期刊:
影响因子:
32.4
通讯作者:
Crotty S
Crotty S
中科院分区:
医学1区
文献类型:
--
作者:
Choi YS;Kageyama R;Eto D;Escobar TC;Johnston RJ;Monticelli L;Lao C;Crotty S

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滤泡辅助性CD4+ T(Tfh)细胞分化的性质仍然存在争议,包括Tfh分化所需的最小信号,以及Tfh分化发生的时间。在这里,我们确定Tfh的发展立即启动树突状细胞(DC)在体内引发。我们证明,诱导型共刺激分子(ICOS)提供了一个关键的早期信号,以诱导转录因子Bcl 6,Bcl 6然后诱导CXCR5,Tfh细胞的典型特征。引人注目的是,在急性病毒感染后第2天,通过CD4+ T细胞的第二次细胞分裂可测量Tfh和效应Th细胞之间的分歧:IL 2R αint细胞表达Bcl 6和CXCR 5(Tfh细胞程序),而IL 2R αhi细胞表现出强烈的Blimp 1表达,抑制Bcl 6(效应Th细胞程序)。即使没有B细胞,Bcl 6 + Tfh细胞和Blimp 1+效应Th细胞群之间的几乎完全极化在72小时时形成。Tfh细胞随后在不存在B细胞的情况下丢失,证明了通过顺序ICOS信号维持Bcl 6和Tfh细胞定型的B细胞需要。
The nature of follicular helper CD4+ T (Tfh) cell differentiation remains controversial, including the minimal signals required for Tfh differentiation, and the time at which Tfh differentiation occurs. Here we determine that Tfh development initiates immediately during dendritic cell (DC) priming in vivo. We demonstrate that inducible costimulator (ICOS) provides a critical early signal to induce the transcription factor Bcl6, and Bcl6 then induces CXCR5, the canonical feature of Tfh cells. Strikingly, a bifurcation between Tfh and effector Th cells was measurable by the second cell division of CD4+ T cells, at day 2 after an acute viral infection: IL2Rαint cells expressed Bcl6 and CXCR5 (Tfh cell program), whereas IL2Rαhi cells exhibited strong Blimp1 expression that repressed Bcl6 (effector Th cell program). Virtually complete polarization between Bcl6+ Tfh cells and Blimp1+ effector Th cell populations developed by 72 hours, even without B cells. Tfh cells were subsequently lost in the absence of B cells, demonstrating a B cell requirement for maintenance of Bcl6 and Tfh cell commitment via sequential ICOS signals.
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