Cutting edge: circulating plasmablasts induce the differentiation of human T follicular helper cells via IL-6 production.

Cutting edge: circulating plasmablasts induce the differentiation of human T follicular helper cells via IL-6 production.
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尖端:循环静脉曲张通过IL-6产生诱导人T卵泡细胞的分化。

DOI:
10.4049/jimmunol.1401190
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发表时间:
2015-03-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Ehrenstein MR
Ehrenstein MR
中科院分区:
其他
文献类型:
--
作者:
Chavele KM;Merry E;Ehrenstein MR

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B细胞需要CD 4 + T滤泡辅助(Tfh)细胞通过生发中心并提供保护性Ab应答。在这篇文章中,我们揭示了一个相互作用,循环的人浆母细胞是Tfh细胞分化程序的有效诱导剂,包括其关键转录因子Bcl-6的表达。与幼稚B细胞相比,浆母细胞诱导Tfh细胞分化的显著增加的倾向是由于它们增加的IL-6的产生。在类风湿性关节炎患者中使用托珠单抗治疗特异性靶向IL-6导致循环Tfh细胞数量和IL-21产生显著减少,这与浆母细胞形成减少相关。我们的数据揭示了循环浆母细胞和Tfh细胞之间的正反馈回路,可以维持自身免疫并将Ab驱动的炎症传播到未受影响的部位;这代表了一个重要的治疗靶点,并揭示了托珠单抗的新作用机制。
B cells require CD4+ T follicular helper (Tfh) cells to progress through the germinal center and provide protective Ab responses. In this article, we reveal a reciprocal interaction whereby circulating human plasmablasts are potent inducers of the Tfh cell–differentiation program, including the expression of their key transcription factor Bcl-6. The markedly increased propensity of plasmablasts, compared with naive B cells, to induce Tfh cell differentiation was due to their increased production of IL-6. Specific targeting of IL-6 using tocilizumab therapy in patients with rheumatoid arthritis led to a significant reduction in circulating Tfh cell numbers and IL-21 production, which was correlated with reduced plasmablast formation. Our data uncover a positive-feedback loop between circulating plasmablasts and Tfh cells that could sustain autoimmunity and spread Ab-driven inflammation to unaffected sites; this represents an important therapeutic target, as well as reveals a novel mechanism of action for tocilizumab.
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