An enhanced level of LAMP-2A participates in CD4(+)T cell hyperactivity in patients with primary biliary cholangitis.

An enhanced level of LAMP-2A participates in CD4(+)T cell hyperactivity in patients with primary biliary cholangitis.
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LAMP-2A 水平升高参与原发性胆汁性胆管炎患者 CD4( )T 细胞过度活跃

DOI:
10.21037/atm-20-2427
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发表时间:
2021-01
影响因子:
--
通讯作者:
Han Y
Han Y
中科院分区:
医学4区
文献类型:
--
作者:
Sun K;Ma S;Tian S;Zhang M;Liu Y;Li B;Zhou X;Zheng X;Zhou X;Wang L;Han Y

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原发性胆汁性胆管炎(PBC)是一种免疫介导的慢性胆汁淤积,T细胞稳态在其中发挥着重要作用。溶酶体相关膜蛋白 2 亚型 A (LAMP-2A) 参与 CD4+T 细胞反应的调节。我们通过流式细胞术全面评估了 PBC 患者 (PBC, n=42)、慢性乙型肝炎 (CHB, n=20) 和健康对照受试者 (HC, n=20) 的 CD4+T 细胞免疫生物学,包括激活状态和 LAMP-2A 表达。此外,我们通过体外刺激研究了 PBC 初始 CD4+T 细胞的激活反应,并测试了删除编码 LAMP-2A 的基因引起的变化。首先,我们发现与 HC 受试者相比,PBC 患者循环 CD4+T 细胞的激活状态增强,并且 PBC 初始 CD4+T 细胞在体外刺激后表现出增强的反应。其次,与 HC 和 CHB 组相比,PBC 幼稚 CD4+T 细胞表达的 LAMP-2A 水平显着升高 [PBC vs. HC,1,954.74 (1,254.28–3,057.14) vs. 1,542.12 (961.18–2,277.98),P=0.03; vs. CHB,1,153.59 (726.87–1,275.48),P=0.02],并且 PBC 初始 CD4+T 细胞的过度反应可以通过体外干扰 LAMP-2A 表达来逆转。第三,PBC-naïve CD4+T细胞的LAMP-2A表达水平与疾病严重程度和药物反应相关。 PBC 初始 CD4+T 细胞的 LAMP-2A 表达异常增加可能与过度激活反应有关。 LAMP-2A 可能是治疗 PBC 的一个新的治疗靶点,可以逆转过度反应,从而减少胆道损伤。
Primary biliary cholangitis (PBC) is an immune-mediated chronic cholestasis, in which T cell homeostasis plays an important role. Lysosomal-associated membrane protein 2 isoform A (LAMP-2A) has been implicated in the regulation of CD4+T cell responses. We comprehensively evaluated the immunobiology of CD4+T cells in patients with PBC (PBC, n=42), chronic hepatitis B (CHB, n=20), and healthy control subjects (HC, n=20) by flow cytometry including activation status and LAMP-2A expression. Additionally, we investigated the activation responses of PBC-naïve CD4+T cells by stimulation in vitro and tested the changes caused by deleting the gene encoding LAMP-2A. Firstly, we found an increased activation status of circulating CD4+T cells from PBC patients compared to the HC subjects, and PBC-naïve CD4+T cells showed enhanced responses after stimulation in vitro. Secondly, PBC-naïve CD4+T cells expressed a significantly higher level of LAMP-2A compared to the HC and CHB groups [PBC vs. HC, 1,954.74 (1,254.28–3,057.14) vs. 1,542.12 (961.18–2,277.98), P=0.03; vs. CHB, 1,153.59 (726.87–1,275.48), P=0.02], and the overreactions of PBC-naïve CD4+T cells could be reversed by interfering with LAMP-2A expression in vitro. Thirdly, the LAMP-2A expression level of PBC-naïve CD4+T cells was related to disease severity and drug response. An abnormally increased LAMP-2A expression of PBC-naïve CD4+T cells might be related to excessive activation responses. LAMP-2A could be a novel therapeutic target for the treatment of PBC by reversing excessive responses and consequently reducing biliary injury.
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