CCR6 is expressed on an IL-10-producing, autoreactive memory T cell population with context-dependent regulatory function.

CCR6 is expressed on an IL-10-producing, autoreactive memory T cell population with context-dependent regulatory function.
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DOI:
10.1084/jem.20091021
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发表时间:
2010-03-15
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Geginat J
Geginat J
中科院分区:
其他
文献类型:
--
作者:
Rivino L;Gruarin P;Häringer B;Steinfelder S;Lozza L;Steckel B;Weick A;Sugliano E;Jarrossay D;Kühl AA;Loddenkemper C;Abrignani S;Sallusto F;Lanzavecchia A;Geginat J

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由调节性T细胞亚群产生的白细胞介素(IL)-10对于预防自身免疫和免疫病理学是重要的,但对产生IL-10的记忆性T细胞的表型和功能知之甚少。人CD 4 + CCR 6+记忆T细胞含有相当数量的IL-17和IL-10产生细胞,并且CCR 6在Th 17促进条件下和在用转化生长因子(TGF)-β致耐受性T细胞引发后诱导。在正常人脾脏中,大多数CCR 6+记忆T细胞与CCR 6+髓样树突状细胞(mDC)紧密相邻,并且引人注目的是,其中一些原位分泌IL-10。此外,CCR 6+记忆T细胞在用自体未成熟mDC离体刺激时产生抑制性IL-10而不是IL-2,并且响应于用抗CD 3抗体的次优T细胞受体(TCR)刺激而有效地分泌IL-10。然而,CCR 6 + T细胞的最佳TCR刺激诱导IL-2、干扰素-γ、CCL 20和CD 40 L的表达,并且自身反应性CCR 6 + T细胞系对各种回忆抗原应答。值得注意的是,我们分离出具有上下文依赖性行为的自身反应性CCR 6 + T细胞克隆,其单独用自体mDC产生IL-10,但在用破伤风类毒素刺激时分泌IL-2并增殖。我们提出了一个新的概念,即记忆T细胞,这是完全装备参与二次免疫反应后,识别相关的回忆抗原,有助于维持稳态条件下的耐受性。
Interleukin (IL)-10 produced by regulatory T cell subsets is important for the prevention of autoimmunity and immunopathology, but little is known about the phenotype and function of IL-10–producing memory T cells. Human CD4+CCR6+ memory T cells contained comparable numbers of IL-17– and IL-10–producing cells, and CCR6 was induced under both Th17-promoting conditions and upon tolerogenic T cell priming with transforming growth factor (TGF)–β. In normal human spleens, the majority of CCR6+ memory T cells were in the close vicinity of CCR6+ myeloid dendritic cells (mDCs), and strikingly, some of them were secreting IL-10 in situ. Furthermore, CCR6+ memory T cells produced suppressive IL-10 but not IL-2 upon stimulation with autologous immature mDCs ex vivo, and secreted IL-10 efficiently in response to suboptimal T cell receptor (TCR) stimulation with anti-CD3 antibodies. However, optimal TCR stimulation of CCR6+ T cells induced expression of IL-2, interferon-γ, CCL20, and CD40L, and autoreactive CCR6+ T cell lines responded to various recall antigens. Notably, we isolated autoreactive CCR6+ T cell clones with context-dependent behavior that produced IL-10 with autologous mDCs alone, but that secreted IL-2 and proliferated upon stimulation with tetanus toxoid. We propose the novel concept that a population of memory T cells, which is fully equipped to participate in secondary immune responses upon recognition of a relevant recall antigen, contributes to the maintenance of tolerance under steady-state conditions.
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