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首页> 外文期刊>Cellular and Molecular Bioengineering >Dual Regulation of L-Selectin-Mediated Leukocyte Adhesion by Endothelial Surface Glycocalyx
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Dual Regulation of L-Selectin-Mediated Leukocyte Adhesion by Endothelial Surface Glycocalyx

机译:L-选择素介导的内皮表面糖萼粘附的双重调控

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摘要

Endothelial surface glycocalyx (ESG) is a carbohydrate-rich, gel-like layer found on vascular endothelium, serving critical functions in mechanotransduction of blood flows, maintenance of the endothelial permeability, and the control of leukocyte adhesion and inflammation. This study aimed to clarify the role of ESG in the adhesion between leukocytes and Human Umbilical Vein Endothelial Cells (HUVECs) under resting or inflammatory conditions. Using an atomic force microscopy-based single-cell adhesion assay, we directly quantified the detachment force and work perpendicular to the cell membrane. Detachment force and work were measured for every separation event of a leukocyte from a HUVEC with ESG, or with the major ESG glycosaminoglycan components, heparan sulfate (HS) and hyaluronic acid (HA) removed. For the resting HUVECs, when HS and/or HA were removed, the detachment force and work increased dramatically. For the HUVECs activated by inflammatory cytokine tumor necrosis factor alpha, we observed increases in the detachment force and work compared to the resting HUVECs, and removal of HS and/or HA resulted in significant decreases in the detachment force and work. The results demonstrate that the ESG layer serves a dual function: (1) on resting endothelium, it prevents leukocyte adhesion, and (2) under inflammatory conditions, it participates in endothelial-leukocyte interactions with molecules such as selectins.
机译:内皮表面糖萼 (ESG) 是一种富含碳水化合物的凝胶状层,存在于血管内皮上,在血流的机械转导、维持内皮通透性以及控制白细胞粘附和炎症方面发挥关键作用。本研究旨在阐明ESG在静息或炎症条件下白细胞与人脐静脉内皮细胞(HUVECs)粘附中的作用。使用基于原子力显微镜的单细胞粘附测定,我们直接量化了垂直于细胞膜的分离力和功。测量具有 ESG 或去除主要 ESG 糖胺聚糖成分、硫酸乙酰肝素 (HS) 和透明质酸 (HA) 的 HUVEC 中白细胞的每次分离事件的分离力和功。对于静止的HUVEC,当HS和/或HA被移除时,分离力和功急剧增加。对于由炎性细胞因子肿瘤坏死因子α激活的HUVEC,我们观察到与静息HUVEC相比,分离力和功增加,HS和/或HA的去除导致分离力和功显着降低。结果表明,ESG层具有双重功能:(1)在静息内皮上,它阻止白细胞粘附,以及(2)在炎症条件下,它参与内皮-白细胞与选择素等分子的相互作用。

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