Adhesive Proteins At Endothelial Cell-To-Cell Junctions And Leukocyte Extravasation

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Abstract
Endothelial cell junctions are complex structures formed by transmembrane adhesive molecules linked to a network of cytoplasmic/cytoskeletal proteins. At least four different types of endothelial junctions have been described (tight junctions, gap junctions, adherence junctions and syndesmos or complexus adhaerentes). Leukocytes adhesion to endothelial cells is frequently followed by their extravasation. The mechanisms which regulate the passage of leukocytes through endothelial clefts remain to be clarified. Many indirect data suggest that leukocytes might transfer signals to endothelial cells both through the release of active agents and adhesion to the endothelial cell surface. These signals could induce the disorganization of interendothelial junctions and facilitate leukocyte transmigration.

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