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白细胞介素 6 改变系统性红斑狼疮中 CD4Foxp3 调节性 T 细胞的迁移能力。

IL-6 alters migration capacity of CD4Foxp3 regulatory T cells in systemic lupus erythematosus.

机构信息

Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

出版信息

Scand J Immunol. 2021 Nov;94(5):e13099. doi: 10.1111/sji.13099. Epub 2021 Sep 8.

Abstract

Regulatory T cells (Tregs) are impaired in human systemic lupus erythematosus (SLE) and involved in disease pathogenesis. However, the mechanisms responsible for the Treg dysfunction in SLE remain unclear. In this study, we aimed to investigate the chemotaxis of Treg response to inflammatory stimulation. Sixty two patients were enrolled, and chemokine receptors, including CCR4, CCR5, CCR6, CCR8 and CXCR3 on CD4+Foxp3+Tregs and non-Treg CD4 T cells, were analysed using FACS. The expression of CCR4 and CCR6 on Tregs of SLE patients decreased, while the expression of CCR4 on non-Treg CD4 T cells increased, as compared with those of age- and sex-matched healthy donors. In parallel, in SLE, the chemotactic capacity of non-Treg CD4 T cells response to CCR4 and CCR6 ligands dramatically increased, while that of Tregs significantly decreased. Moreover, we found that cytokines IL-6 and IL-10 positively and negatively modulate the expression of those receptors respectively. IL-6, the significantly increased cytokine in active SLE, dramatically elevated CCR4 and CCR6 expression on non-Treg CD4 T cells. However, as for Tregs, these cells produced more IL-10 than non-Treg CD4 T cells upon IL-6 stimulation, and these IL-10 led to the inhibition of CCR4 and CCR6. In sum, our data provided new evidence suggesting a functional deficiency of Tregs in SLE. It may suggest that those dysfunctional Tregs have less access to the inflammation locus to exert inhibitory capacity.

摘要

调节性 T 细胞(Tregs)在人类系统性红斑狼疮(SLE)中受损,并参与疾病发病机制。然而,导致 SLE 中 Treg 功能障碍的机制尚不清楚。在这项研究中,我们旨在研究 Treg 对炎症刺激的趋化反应。共纳入 62 例患者,使用 FACS 分析 CD4+Foxp3+Tregs 和非 Treg CD4 T 细胞上的趋化因子受体,包括 CCR4、CCR5、CCR6、CCR8 和 CXCR3。与年龄和性别匹配的健康供体相比,SLE 患者 Treg 上的 CCR4 和 CCR6 表达降低,而非 Treg CD4 T 细胞上的 CCR4 表达增加。同时,在 SLE 中,非 Treg CD4 T 细胞对 CCR4 和 CCR6 配体的趋化能力显著增加,而 Treg 的趋化能力显著降低。此外,我们发现细胞因子 IL-6 和 IL-10 分别正向和负向调节这些受体的表达。在活动期 SLE 中显著增加的细胞因子 IL-6 显著增加了非 Treg CD4 T 细胞上的 CCR4 和 CCR6 表达。然而,对于 Tregs,这些细胞在 IL-6 刺激下产生比非 Treg CD4 T 细胞更多的 IL-10,并且这些 IL-10 导致 CCR4 和 CCR6 的抑制。总之,我们的数据提供了新的证据表明 SLE 中 Treg 存在功能缺陷。这可能表明这些功能失调的 Tregs 较少进入炎症部位发挥抑制作用。

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