The interaction of plasminogen activator with a reconstituted basement membrane matrix and extracellular macromolecules produced by cultured epithelial cells

Journal of Cellular Biochemistry
P G McGuire, N W Seeds

Abstract

Laminin and fibronectin are glycoproteins that influence cell behavior and mediate cell/substratum adhesion. We have examined the interaction of these macromolecules with the serine protease plasminogen activator (PA) in two types of extracellular matrices; one produced by the murine Engelbreth-Holm-Swarm (EHS) tumor (Matrigel), and another by normal kidney epithelial cells in culture. Matrigel was found to contain significant quantities of tissue-type PA (tPA). Two of the major components of Matrigel, laminin and type IV collagen, were also examined. Tissue-type PA was associated with purified preparations of laminin; however, it was not found associated with type IV collagen. Normal kidney epithelial cells in culture secrete large amounts of urokinase (UK) and deposit a subepithelial matrix containing both laminin and fibronectin. These matrix macromolecules were isolated from the deposited matrix by immunoprecipitation, examined by zymography, and found to contain UK. The potential role of this interaction in the mechanisms of cell migration and matrix remodeling is discussed.

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