CD8(+) T cells drive autoimmune hematopoietic stem cell dysfunction and bone marrow failure.

CD8(+) T cells drive autoimmune hematopoietic stem cell dysfunction and bone marrow failure.
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DOI:
10.1016/j.jaut.2016.07.007
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发表时间:
2016-12
影响因子:
12.8
通讯作者:
Hoyer KK
Hoyer KK
中科院分区:
医学1区
文献类型:
--
作者:
Gravano DM;Al-Kuhlani M;Davini D;Sanders PD;Manilay JO;Hoyer KK

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骨髓衰竭综合征是一组以骨髓干细胞功能障碍为特征的疾病,导致不同程度的发育不全和全血细胞减少,许多患者具有自身免疫性和炎症性。Thelper 1(Th1)极化的CD4+T细胞在驱动骨髓衰竭中的重要作用已经在几个模型中得到了明确的证实。然而,证明CD8+T细胞在骨髓功能障碍中的功能作用的动物模型数据在很大程度上是缺乏的,我们的目的是验证CD8+T细胞在驱动骨髓功能障碍中发挥非冗余作用的假设。临床证据表明CD8+T细胞在骨髓衰竭中起有害作用,而Foxp3+调节性T细胞(Tregs)在维持骨髓免疫耐受中起有益作用。我们证明,IL-2缺陷的小鼠,功能树突状细胞的缺陷,会发展成自发性骨髓衰竭。此外,我们还证明了CD8+T细胞在骨髓衰竭的发生发展中的关键作用,这种作用依赖于细胞因子干扰素γ。CD8+T细胞促进造血干细胞功能障碍和髓系祖细胞的耗竭,导致贫血。过继转移实验表明,CD8+T细胞显著加快了疾病的进展,并促进了CD4+T细胞在骨髓中的积聚。因此,IL-2缺陷小鼠的骨髓失调是由产生Th1和干扰素γ的CD8+T细胞(Tc1)反应介导的。
Bone marrow (BM) failure syndrome encompasses a group of disorders characterized by BM stem cell dysfunction, resulting in varying degrees of hypoplasia and blood pancytopenia, and in many patients is autoimmune and inflammatory in nature. The important role of T helper 1 (Th1) polarized CD4+ T cells in driving BM failure has been clearly established in several models. However, animal model data demonstrating a functional role for CD8+ T cells in BM dysfunction is largely lacking and our objective was to test the hypothesis that CD8+ T cells play a non-redundant role in driving BM failure. Clinical evidence implicates a detrimental role for CD8+ T cells in BM failure and a beneficial role for Foxp3+ regulatory T cells (Tregs) in maintaining immune tolerance in the BM. We demonstrate that IL-2-deficient mice, which have a deficit in functional Tregs, develop spontaneous BM failure. Furthermore, we demonstrate a critical role for CD8+ T cells in the development of BM failure, which is dependent on the cytokine, IFNγ. CD8+ T cells promote hematopoietic stem cell dysfunction and depletion of myeloid lineage progenitor cells, resulting in anemia. Adoptive transfer experiments demonstrate that CD8+ T cells dramatically expedite disease progression and promote CD4+ T cell accumulation in the BM. Thus, BM dysregulation in IL-2-deficient mice is mediated by a Th1 and IFNγ-producing CD8+ T cell (Tc1) response.
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