Expression of Foxp3 by T follicular helper cells in end-stage germinal centers.

Expression of Foxp3 by T follicular helper cells in end-stage germinal centers.
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DOI:
10.1126/science.abe5146
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发表时间:
2021-07-16
期刊:
Science (New York, N.Y.)
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生发中心 (GC) 是免疫球蛋白体细胞超突变和亲和力成熟的场所,这些过程对于有效的抗体反应至关重要。 GC 的形成已被详细研究,但对于导致其消退和最终终止的因素知之甚少,这些因素最终限制了抗体在单次反应中成熟的程度。我们发现,在免疫诱导的 GC 收缩之前,GC 驻留的 Foxp3+ T 细胞会急剧激增,这至少部分归因于滤泡辅助 T (Tfh) 细胞对转录因子 Foxp3 的上调。 Tfh 细胞中 Foxp3 的异位表达足以减小 GC 大小,这表明 Tfh 细胞自然上调 Foxp3 作为 GC 寿命的潜在调节剂。
Germinal centers (GCs) are the site of immunoglobulin somatic hypermutation and affinity maturation, processes essential to an effective antibody response. The formation of GCs has been studied in detail, but less is known about what leads to their regression and eventual termination, factors that ultimately limit the extent to which antibodies mature within a single reaction. We show that contraction of immunization-induced GCs is immediately preceded by an acute surge in GC-resident Foxp3+ T cells, attributed at least partly to upregulation of the transcription factor Foxp3 by T follicular helper (Tfh) cells. Ectopic expression of Foxp3 in Tfh cells is sufficient to decrease GC size, implicating the natural upregulation of Foxp3 by Tfh cells as a potential regulator of GC lifetimes.
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