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首页> 外文期刊>Infection and immunity >Increased Activation and Oligoclonality of Peripheral CD8+ T Cells in the Chronic Human Helminth Infection Alveolar Echinococcosis
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Increased Activation and Oligoclonality of Peripheral CD8+ T Cells in the Chronic Human Helminth Infection Alveolar Echinococcosis

机译:慢性人类蠕虫感染肺泡棘球co病外周CD8 + T细胞的激活和寡克隆的增加。

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Alveolar echinococcosis (AE) in humans is a chronic disease characterized by slowly expanding liver lesions. Cellular immunity restricts the spreading of the extracellular pathogen, but functional contributions of CD4+ and CD8+ T cells are not defined. Here we studied ex vivo the phenotype and function of circulating T-cell subsets in AE patients by means of flow cytometry, T-cell receptor spectratyping, and lymphocyte proliferation. AE patients with parasitic lesions displayed a significant increase of activation of predominantly CD8+ T cells compared to healthy controls and AE patients without lesions. In vitro, proliferative T-cell responses to polyclonal stimulation with recall antigens and Echinococcus multilocularis vesicular fluid antigen were sustained during chronic persisting infection in all AE patients. Only in AE patients with parasitic lesions did T-cell receptor spectratyping reveal increased oligoclonality of CD8+ but not CD4+ T cells, suggesting a persistent antigenic drive for CD8+ T cells with subsequent proliferation of selected clonotypes. Thus, our data provide strong evidence for an active role of CD8+ T cells in AE.
机译:人类的肺泡棘球co病(AE)是一种慢性疾病,其特征是肝脏病变逐渐扩大。细胞免疫限制了细胞外病原体的传播,但尚未定义CD4 + 和CD8 + T细胞的功能贡献。在这里,我们通过流式细胞仪,T细胞受体谱型和淋巴细胞增殖研究了AE患者中循环T细胞亚型的表型和功能。与健康对照组和无病变的AE患者相比,有寄生性病变的AE患者表现出主要是CD8 + T细胞活化的显着增加。在体外,在所有持久性持续感染期间,召回抗原和多球棘球E 囊泡液抗原对多克隆刺激的增殖性T细胞反应持续存在。仅在具有寄生虫病灶的AE患者中,T细胞受体谱型显示CD8 + 的寡聚性增加,但CD4 + T细胞的寡聚性增加,表明对CD8 的持久抗原驱动+ T细胞,随后克隆出某些克隆型。因此,我们的数据为CD8 + T细胞在AE中的活跃作用提供了有力的证据。

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