MicroRNA-146a regulates ICOS-ICOSL signalling to limit accumulation of T follicular helper cells and germinal centres.

MicroRNA-146a regulates ICOS-ICOSL signalling to limit accumulation of T follicular helper cells and germinal centres.
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DOI:
10.1038/ncomms7436
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发表时间:
2015-03-06
影响因子:
16.6
通讯作者:
Vinuesa, Carola G.
Vinuesa, Carola G.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Pratama, Alvin;Srivastava, Monika;Williams, Naomi J.;Papa, Ilenia;Lee, Sau K.;Dinh, Xuyen T.;Hutloff, Andreas;Jordan, Margaret A.;Zhao, Jimmy L.;Casellas, Rafael;Athanasopoulos, Vicki;Vinuesa, Carola G.

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严格控制T滤泡辅助细胞(Tfh)是生殖中心(GC)反应最佳成熟所必需的。控制Tfh细胞分化的分子机制仍然不完全清楚。在这里,我们发现microRNA-146 a(miR-146 a)在Tfh细胞中高度表达,并且峰值miR-146 a表达标志着免疫后Tfh应答的下降。miR-146 a的缺失导致Tfh和GC B细胞的细胞内在积累。miR-146 a抑制几种Tfh细胞表达的信使RNA,其中,ICOS是miR-146 a缺陷型T细胞中最强烈的细胞自主上调靶点。此外,miR-146 a缺陷导致GC B细胞和抗原呈递细胞上的ICOSL表达增加。通过注射低剂量的ICOSL阻断抗体或通过将miR-146 a缺陷型T细胞中的Icos基因剂量减半来部分阻断ICOS信号传导,可防止Tfh和GC B细胞积累。总的来说,miR-146 a作为转录后制动器出现,以限制Tfh细胞和GC反应。 在生发中心,产生抗体的B细胞的成熟是由T滤泡辅助细胞协调的。Pratama等人在此表明,miR-146 a通过靶向生发中心中的ICOS-ICOS配体信号传导来负调节T滤泡辅助细胞。
Tight control of T follicular helper (Tfh) cells is required for optimal maturation of the germinal centre (GC) response. The molecular mechanisms controlling Tfh-cell differentiation remain incompletely understood. Here we show that microRNA-146a (miR-146a) is highly expressed in Tfh cells and peak miR-146a expression marks the decline of the Tfh response after immunization. Loss of miR-146a causes cell-intrinsic accumulation of Tfh and GC B cells. MiR-146a represses several Tfh-cell-expressed messenger RNAs, and of these, ICOS is the most strongly cell autonomously upregulated target in miR-146a-deficient T cells. In addition, miR-146a deficiency leads to increased ICOSL expression on GC B cells and antigen-presenting cells. Partial blockade of ICOS signalling, either by injections of low dose of ICOSL blocking antibody or by halving the gene dose of Icos in miR-146a-deficient T cells, prevents the Tfh and GC B-cell accumulation. Collectively, miR-146a emerges as a post-transcriptional brake to limit Tfh cells and GC responses. Maturation of antibody-producing B cells in germinal centers is orchestrated by T follicular helper cells. Here Pratama et al. show that miR-146a negatively regulates T follicular helper cells by targeting ICOS-ICOS ligand signaling in germinal centers.
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