Selective expression of claudin-5 in thymic endothelial cells regulates the blood-thymus barrier and T-cell export.

Selective expression of claudin-5 in thymic endothelial cells regulates the blood-thymus barrier and T-cell export.
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胸腺内皮细胞中claudin-5的选择性表达调节血-胸腺屏障和T细胞输出。

DOI:
10.1093/intimm/dxaa069
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发表时间:
2021-03-01
影响因子:
4.4
通讯作者:
Hamazaki Y
Hamazaki Y
中科院分区:
医学3区
文献类型:
--
作者:
Nagatake T;Zhao YC;Ito T;Itoh M;Kometani K;Furuse M;Saika A;Node E;Kunisawa J;Minato N;Hamazaki Y

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Claudin-5 如何调节血胸腺屏障 T 细胞发育取决于胸腺微环境,其中内皮细胞 (EC) 发挥着至关重要的作用。有趣的是,胸腺皮质的血管通透性低于其他器官,表明存在血胸腺屏障(BTB)。另一方面,携带自身抗原的血源性分子和树突状细胞可进入髓质,促进中枢耐受诱导,并且通过皮质髓质交界处(CMJ)的血管发生连续的T前体迁移和成熟胸腺细胞流出。我们发现,claudin-5 (Cld5),一种紧密连接的膜蛋白,在皮质脉管系统的几乎所有 EC 中表达,而髓质和 CMJ 的 EC 中大约一半缺乏 Cld5 表达。静脉注射的生物素示踪剂很难穿透皮质 Cld5+ 血管,但它通过 Cld5- 血管渗漏到髓质实质中。 EC 细胞系中的 Cld5 表达导致体外跨内皮阻力显着增加,并且生物素示踪剂从 Cldn5–/– 小鼠的皮质脉管系统中泄漏。此外,静脉注射的 1 磷酸鞘氨醇通过 Cld5- 血管选择性分布到髓质中,可能确保 CD3high 成熟胸腺细胞从 CMJ 处的 Cld5- 血管流出。这些结果表明,皮质和髓质中不同的 Cld5 表达谱可能分别控制 BTB 和 T 细胞通往血液循环的通道。
How claudin-5 regulates the blood-thymus barrier T-cell development depends on the thymic microenvironment, in which endothelial cells (ECs) play a vital role. Interestingly, vascular permeability of the thymic cortex is lower than in other organs, suggesting the existence of a blood–thymus barrier (BTB). On the other hand, blood-borne molecules and dendritic cells bearing self-antigens are accessible to the medulla, facilitating central tolerance induction, and continuous T-precursor immigration and mature thymocyte egress occur through the vessels at the cortico-medullary junction (CMJ). We found that claudin-5 (Cld5), a membrane protein of tight junctions, was expressed in essentially all ECs of the cortical vasculatures, whereas approximately half of the ECs of the medulla and CMJ lacked Cld5 expression. An intravenously (i.v.) injected biotin tracer hardly penetrated cortical Cld5+ vessels, but it leaked into the medullary parenchyma through Cld5– vessels. Cld5 expression in an EC cell line caused a remarkable increase in trans-endothelial resistance in vitro, and the biotin tracer leaked from the cortical vasculatures in Cldn5–/– mice. Furthermore, i.v.-injected sphingosine-1 phosphate distributed selectively into the medulla through the Cld5– vessels, probably ensuring the egress of CD3high mature thymocytes from Cld5– vessels at the CMJ. These results suggest that distinct Cld5 expression profiles in the cortex and medulla may control the BTB and the T-cell gateway to blood circulation, respectively.
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