Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, 3584 CL, Utrecht, The Netherlands.
J Immunol. 2012 Jan 15;188(2):578-84. doi: 10.4049/jimmunol.1101972. Epub 2011 Dec 12.
In most species, γδ T cells preferentially reside in epithelial tissues like the skin. Lymph duct cannulation experiments in cattle revealed that bovine dermal γδ T cells are able to migrate from the skin to the draining lymph nodes via the afferent lymph. For αβ T cells, it is generally accepted that epithelial and mucosal tissue egress is regulated by expression of the CCR7 chemokine receptor. In this study, we tracked the migratory route of bovine lymph-derived γδ T cells and examined their CCR7 cell surface expression in several compartments along this route. Total lymph cells from afferent and efferent origin were labeled with PKH fluorescent dyes and injected into the bloodstream. PKH(+) cells already reappeared in the afferent lymph after 4 h. The vast majority of the PKH(+) cells retrieved from the afferent lymph were of the WC1(+) γδ T cell phenotype, proving that this PKH(+) γδ T cell subset is able to home to and subsequently exit the skin. PKH(+) γδ T cells from afferent and efferent lymph lack CCR7 surface expression and display high levels of CD62L compared with CD4 T cells, which do express CCR7. Skin homing receptors CCR4 and CCR10 in contrast were transcribed by both CD4 and γδ T cells. Our findings suggest that γδ T cell skin egress and migration into the peripheral lymphatics is CCR7-independent and possibly mediated by CD62L expression.
在大多数物种中,γδ T 细胞优先存在于皮肤等上皮组织中。牛皮肤γδ T 细胞通过输入淋巴管从皮肤迁移到引流淋巴结的淋巴导管插管实验表明,牛皮肤γδ T 细胞能够通过输入淋巴管从皮肤迁移到引流淋巴结。对于αβ T 细胞,通常认为上皮组织和粘膜组织的迁出受 CCR7 趋化因子受体的表达调控。在这项研究中,我们跟踪了牛淋巴来源的γδ T 细胞的迁移途径,并检查了它们在这条途径中的几个部位的 CCR7 细胞表面表达。来自输入和输出的总淋巴细胞用 PKH 荧光染料标记,并注入血液。PKH(+)细胞在 4 小时后已经重新出现在输入淋巴中。从输入淋巴中回收的绝大多数 PKH(+)细胞是 WC1(+)γδ T 细胞表型,证明这种 PKH(+)γδ T 细胞亚群能够归巢并随后离开皮肤。与表达 CCR7 的 CD4 T 细胞相比,来自输入和输出淋巴的 PKH(+)γδ T 细胞缺乏 CCR7 表面表达,并显示出高水平的 CD62L。相反,皮肤归巢受体 CCR4 和 CCR10 由 CD4 和γδ T 细胞转录。我们的研究结果表明,γδ T 细胞的皮肤迁出和迁移到外周淋巴系统是 CCR7 非依赖性的,可能通过 CD62L 表达介导。
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