Role of the light chain of high molecular weight kininogen in adhesion, cell-associated proteolysis and angiogenesis.
Cleavage of high molecular weight kininogen (HK) by plasma kallikrein results in a light chain and a heavy chain (HK). The light chain has two domains: D6, which binds (pre)kallikrein, and D5, which binds to anionic surfaces, including heparin as well as zinc. Initially, HK was thought to be important for surface-activated coagulation. HKa or D5 binds to the urokinase receptor on endothelial cells, thereby enhancing the conversion of prourokinase to urokinase by kallikrein, and, thus, cell-associated fibrinolysis. HKa or D5 is antiadhesive by competing with vitronectin binding to the urokinase receptor and/or forming a complex with vitronectin. D5 inhibits endothelial cell migration, proliferation, tube formation and angiogenesis, thus modulating inflammation and neovascularization.
Sol Sherry Thrombosis Research Center, Temple University School of Medicine, Philadelphia, PA 19140, USA.
R W
RW
Colman
D000595:Amino Acid Sequence; D000818:Animals; D002448:Cell Adhesion / Q000502:physiology*; D006801:Humans; D007704:Kininogens / Q000737:chemistry / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D018919:Neovascularization, Physiologic / Q000502:physiology*
D007704:Kininogens