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Urokinase-type plasminogen activator receptor (uPAR) is a cell surface receptor that binds urokinase-type plasminogen activator (uPA) with high affinity, thereby promoting the activation of plasminogen cells. It is a multidomain glycoprotein anchored to the cell membrane via GPI and was originally identified as a cell surface urokinase saturation binding site. uPAR binds urokinase, limiting the activation of plasminogen closest to the cell membrane periphery. In addition to the main ligand urokinase, uPAR also interacts with other proteins, among which vitronectin is a uPAR-associated protein and an integrin family membrane protein.