Plasminogen activators, integrins, and the coordinated regulation of cell adhesion and migration.

Cellular migration is critically dependent on an interplay between forces of attachment and detachment. Recent studies show that the serine protease urokinase and its major inhibitor and receptor regulate the adhesive properties of integrins, at least in part through initiation of cellular signals. These new functions for an old protease system imply intricate connections between proteolysis and adhesion that operate at the cell surface to regulate migration.