期刊
ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY
卷 32, 期 8, 页码 E90-U141出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/ATVBAHA.112.252080
关键词
vascular endothelial-cadherin; platelet endothelial cell adhesion molecule-1; F-actin; tumor necrosis factor-alpha; endothelial barrier function
资金
- Ludwig Institute for Cancer Research, Cancer Research UK
- Association for International Cancer Research
- EC FP6 project [LSHG-CT-2003-502935]
- Marie Curie fellowship [HPMF-CT-2000-01061]
- British Heart Foundation intermediate fellowship [FS/04/006]
- Spanish Government [SAF2008-01936, SAF2011-22624]
- FPI fellowship from Spanish government
- JAE pre fellowship from Consejo Superior de Investigaciones Cientificas
- Royal Society University Research Fellowship
- Wellcome Trust
- British Heart Foundation
- [BFU2011-22859]
Objective-Endothelial cells provide a barrier between the blood and tissues, which is reduced during inflammation to allow selective passage of molecules and cells. Adherens junctions (AJ) play a central role in regulating this barrier. We aim to investigate the role of a distinctive 3-dimensional reticular network of AJ found in the endothelium. Methods and Results-In endothelial AJ, vascular endothelial-cadherin recruits the cytoplasmic proteins beta-catenin and p120-catenin. beta-catenin binds to alpha-catenin, which links AJ to actin filaments. AJ are usually described as linear structures along the actin-rich intercellular contacts. Here, we show that these AJ components can also be organized in reticular domains that contain low levels of actin. Reticular AJ are localized in areas where neighboring cells overlap and encompass the cell adhesion receptor platelet endothelial cell adhesion molecule-1 (PECAM-1). Superresolution microscopy revealed that PECAM-1 forms discrete structures distinct from and distributed along AJ, within the voids of reticular domains. Inflammatory tumor necrosis factor-alpha increases permeability by mechanisms that are independent of actomyosin-mediated tension and remain incompletely understood. Reticular AJ, but not actin-rich linear AJ, were disorganized by tumor necrosis factor-alpha. This correlated with PECAM-1 dispersal from cell borders. PECAM-1 inhibition with blocking antibodies or small interfering RNA specifically disrupted reticular AJ, leaving linear AJ intact. This disruption recapitulated typical tumor necrosis factor-alpha-induced alterations of barrier function, including increased beta-catenin phosphorylation, without altering the actomyosin cytoskeleton. Conclusion-We propose that reticular AJ act coordinately with PECAM-1 to maintain endothelial barrier function in regions of low actomyosin-mediated tension. Selective disruption of reticular AJ contributes to permeability increase in response to tumor necrosis factor-alpha. (Arterioscler Thromb Vasc Biol. 2012;32:e90-102.)
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