Abstract
The ECM is composed of various cell-adhesive glycoproteins, such as, fibronectin (FN), laminin (LN), and different types of glycosaminoglycans and proteoglycans. These building blocks of the ECM are linked together to form a dense and complex tissue that fills the interstitial spaces and comprises the boundaries between cells and tissues. The ECM is the major milieu in which immune cells function during inflammatory processes (Shimizu and Shaw, 1991; Yamada, 1991). Recognition of ECM-glycoproteins by immune cells is mediated by very late activation (VLA) receptors, also referred to as integrins of the β1-subfamily (Hynes, 1992). A prerequisite of lymphocyte-ECM interactions is activation of the cells by mitogens, or via their CD3-T cell receptor complex, either of these types of activation modulates the affinity of otherwise inactive β1-integrins (Shimizu, et al., 1990).
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