T follicular helper cells mediate expansion of regulatory B cells via IL-21 in Lupus-prone MRL/lpr mice.

T follicular helper cells mediate expansion of regulatory B cells via IL-21 in Lupus-prone MRL/lpr mice.
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在狼疮倾向的 MRL/lpr 小鼠中,滤泡辅助 T 细胞通过 IL-21 介导调节性 B 细胞的扩增。

DOI:
10.1371/journal.pone.0062855
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Zou H
Zou H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yang X;Yang J;Chu Y;Wang J;Guan M;Zhu X;Xue Y;Zou H

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滤泡辅助 T (Tfh) 细胞可以介导体液免疫反应并增强自身免疫,而 Tfh 细胞在自身免疫性疾病中对调节性 B (B10) 细胞的作用尚不清楚。在这里,我们研究了狼疮易发性 MRL/Mp-lpr/lpr (MRL/lpr) 小鼠中 Tfh 细胞和 B10 细胞的百分比,并检查了 Tfh 细胞来源的白细胞介素 21 (IL-21) 对 B10 细胞分化过程中 IL-10 产生的影响和机制。 Tfh 细胞和 B10 细胞均在 MRL/lpr 小鼠的脾脏中扩增。此外,观察到Tfh细胞和B10细胞的比例之间呈正相关。 MRL/lpr 小鼠的 Tfh 细胞来源的 IL-21 可以促进 B10 细胞分化过程中 IL-10 的产生。重要的是,IL-21 的中和可抑制 IL-10 的产生以及 B10 细胞在体外和体内的扩增。 IL-21 通过激活磷酸化信号转导和转录激活剂 3 (p-STAT3) 诱导 IL-10 产生。抑制 p-STAT3 可有效阻止 B10 细胞分化过程中 IL-10 的产生。此外,IL-21诱导的IL-10通过抑制T细胞增殖发挥调节功能。这些数据表明,Tfh 细胞不仅介导体液免疫反应和增强自身免疫,而且还通过诱导 IL-10 产生在免疫调节作用中发挥更广泛的作用。
T follicular helper (Tfh) cells can mediate humoral immune responses and augment autoimmunity, whereas the role of Tfh cells on regulatory B (B10) cells in autoimmunity diseases is not clear. Here, we investigated the percentages of Tfh cells and B10 cells in lupus-prone MRL/Mp-lpr/lpr (MRL/lpr) mice and examined the effects and mechanism of Tfh cell-derived interleukin-21 (IL-21) on IL-10 production during the differentiation of B10 cells. Both Tfh cells and B10 cells were expanded in spleens of MRL/lpr mice. In addition, a positive correlation between the proportions of Tfh cells and B10 cells was observed. Tfh cell-derived IL-21 from MRL/lpr mice could promote IL-10 production during the differentiation of B10 cells. Importantly, neutralization of IL-21 inhibited IL-10 production and expansion of B10 cells both in vitro and in vivo. IL-21 induced IL-10 production via activation of phosphorylated signal transduction and activator of transcription 3 (p-STAT3). Inhibition of p-STAT3 effectively blocked IL-10 production during the differentiation of B10 cells. Moreover, IL-21-induced IL-10 exerted a regulatory function by inhibiting the proliferation of T cells. These data suggest that Tfh cells not only mediate humoral immune responses and augment autoimmunity but also play a broader role in immune regulatory actions via the induction of IL-10 production.
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