The roles of adhesion molecules and proteinases in lymphocyte transendothelial migration

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
J A MadriT Haas

Abstract

T cell extravasation into perivascular tissue during inflammation involves transmigration through the endothelial cell (EC) layer and basement membrane. We have demonstrated that matrix metalloxproteinase-2 (MMP-2) is induced in T cells upon adhesion to endothelial cells and that the induction of MMP-2 is mediated by binding of T cell VLA-4 to VCAM-1. Cloned murine Th1 cells antigenic to myelin basic protein, either expressing VLA-4 on their cell surface and causing experimental autoimmune encephalomyelitis (EAE) or not expressing VLA-4 and not causing EAE, were used. VLA-4 positive (+) T cells that adhered to VCAM-1 positive (+) endothelial cells exhibited an induction in MMP-2 mRNA, protein, and activity, whereas MMP-2 was not induced in the T cells that adhered to the VCAM-1 negative (-) endothelial cells or VLA-4 negative (-) T cells that adhered to VCAM-1+ endothelial cells. Incubating T cells with rVCAM-1-coated dishes showed that VLA-4+ T cells adhered to the molecule and that adhesion to rVCAM-1 was sufficient to induce MMP-2. VLA-4+ T cells that had transmigrated through a VCAM-1+ endothelial cell monolayer exhibited MMP-2 activity. TIMP-2 was shown to reduce T cell transmigration in vitro. Transmigrated T cells exhibi...Continue Reading

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Adhesion Molecules in Health and Disease

Cell adhesion molecules are a subset of cell adhesion proteins located on the cell surface involved in binding with other cells or with the extracellular matrix in the process called cell adhesion. In essence, cell adhesion molecules help cells stick to each other and to their surroundings. Cell adhesion is a crucial component in maintaining tissue structure and function. Discover the latest research on adhesion molecule and their role in health and disease here.