In:
Arteriosclerosis, Thrombosis, and Vascular Biology, Ovid Technologies (Wolters Kluwer Health), Vol. 34, No. suppl_1 ( 2014-05)
Abstract:
Inflammation is causally linked to many chronic human disorders and constitutes a growing problem in the ageing population. The inflammatory process is driven by interactions of activated leukocytes with the endothelial lining of blood vessels. This requires binding of leukocyte β2-integrins to endothelial ICAM-1 (InterCellular Adhesion Molecule-1), which allows leukocyte adhesion, spreading, crawling and transendothelial migration (TEM). Integrin binding induces ICAM-1 clustering and its consequent association to F-actin which enforces leukocyte adhesion. Here, we analyzed the molecular basis of this positive feedback loop. We show that ICAM-1 clustering promotes its binding to F-actin through distinct complexes with FilaminB, Cortactin and α-Actinin-4. We found that α-Actinin-4 regulates endothelial cell peripheral stiffness, which is sensed by adherent neutrophils and promotes adhesion, spreading, crawling and TEM. Conversely, increasing endothelial cell stiffness stimulates the ICAM-1-α-Actinin-4 interaction. Finally, we found that the endothelial lining of atherosclerotic plaques, which is characterized by increased stiffness and leukocyte infiltration, shows increased expression of α-Actinin-4. These results identify α-Actinin-4-regulated endothelial cell stiffness as a novel pro-inflammatory event that promotes ICAM-1-mediated leukocyte adhesion and TEM.
Type of Medium:
Online Resource
ISSN:
1079-5642
,
1524-4636
DOI:
10.1161/atvb.34.suppl_1.171
Language:
English
Publisher:
Ovid Technologies (Wolters Kluwer Health)
Publication Date:
2014
detail.hit.zdb_id:
1221433-4
detail.hit.zdb_id:
1494427-3
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