Germinal center B cell depletion diminishes CD4+ follicular T helper cells in autoimmune mice.

Germinal center B cell depletion diminishes CD4+ follicular T helper cells in autoimmune mice.
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DOI:
10.1371/journal.pone.0102791
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Wang Y
Wang Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yusuf I;Stern J;McCaughtry TM;Gallagher S;Sun H;Gao C;Tedder T;Carlesso G;Carter L;Herbst R;Wang Y

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滤泡 CD4+ T 辅助细胞 (Tfh) 的持续支持驱动生发中心 (GC) 反应,该反应持续数周以产生高亲和力记忆 B 细胞和浆细胞。在自身免疫 Sle1 和 NZB/W F1 小鼠中,Tfh 细胞数量持续增加,促进自身反应性 B 细胞的扩增。在几种自身免疫性疾病中也描述了循环 Tfh 样细胞的扩增。尽管现在已经很好地描述了 Tfh 分化所需的信号,但维持完全分化的 Tfh 的机制尚不清楚。最近的数据证明了 GC B 细胞在蛋白质免疫后维持 Tfh 的作用。鉴于 Tfh 在自身免疫性疾病中发挥的致病作用,我们探讨了 B 细胞是否是维持自身反应性 Tfh 所必需的。我们的数据表明成熟自身反应性 Tfh 细胞的数量受 GC B 细胞控制。 Sle1 自身免疫小鼠中 B 细胞的耗竭导致 Tfh 细胞急剧减少。在NZB/W F1自身免疫小鼠中,与SRBC免疫模型类似,GC B细胞支持成熟Tfh的维持,这主要依赖于ICOS。 CD28 相关途径对于 SRBC 免疫小鼠的 Tfh 维持是可有可无的,但在自发 NZB/W F1 模型中是必需的。这些数据表明,成熟的 Tfh 细胞需要来自 GC B 细胞的信号才能在自身免疫和免疫模型中维持其最佳数量和功能。因此,自身免疫性疾病中针对 B 细胞的免疫疗法可能会影响致病性 Tfh 细胞。
Continuous support from follicular CD4+ T helper (Tfh) cells drives germinal center (GC) responses, which last for several weeks to produce high affinity memory B cells and plasma cells. In autoimmune Sle1 and NZB/W F1 mice, elevated numbers of Tfh cells persist, promoting the expansion of self-reactive B cells. Expansion of circulating Tfh like cells have also been described in several autoimmune diseases. Although, the signals required for Tfh differentiation have now been well described, the mechanisms that sustain the maintenance of fully differentiated Tfh are less understood. Recent data demonstrate a role for GC B cells for Tfh maintenance after protein immunization. Given the pathogenic role Tfh play in autoimmune disease, we explored whether B cells are required for maintenance of autoreactive Tfh. Our data suggest that the number of mature autoreactive Tfh cells is controlled by GC B cells. Depletion of B cells in Sle1 autoimmune mice leads to a dramatic reduction in Tfh cells. In NZB/W F1 autoimmune mice, similar to the SRBC immunization model, GC B cells support the maintenance of mature Tfh, which is dependent mainly on ICOS. The CD28-associated pathway is dispensable for Tfh maintenance in SRBC immunized mice, but is required in the spontaneous NZB/W F1 model. These data suggest that mature Tfh cells require signals from GC B cells to sustain their optimal numbers and function in both autoimmune and immunization models. Thus, immunotherapies targeting B cells in autoimmune disease may affect pathogenic Tfh cells.
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