title: Heparanase-A Link between Coagulation, Angiogenesis, and Cancer.
abstract: Heparanase that was cloned from and is abundant in the placenta is implicated in cell invasion, tumor metastasis, and angiogenesis. Recently we have demonstrated that heparanase may also affect the hemostatic system in a non-enzymatic manner. Heparanase was shown to up-regulate tissue factor (TF) expression and interact with tissue factor pathway inhibitor (TFPI) on the cell surface, leading to dissociation of TFPI from the cell membrane of endothelial and tumor cells, resulting in increased cell surface coagulation activity. More recently, we have shown that heparanase directly enhances TF activity, resulting in increased factor Xa production and activation of the coagulation system. Data indicate increased levels and possible involvement of heparanase in vascular complications in pregnancy. Taking into account the prometastatic and proangiogenic functions of heparanase, overexpression in human malignancies, and abundance in platelets and placenta, its involvement in the coagulation machinery is an intriguing novel arena for further research.
authors.affiliation: Thrombosis and Hemostasis Unit, Department of Hematology, Rambam Health Care Campus and Technion-Israel Institute of Technology, Haifa, Israel.
authors.forename: Yona
authors.initials: Y
authors.lastname: Nadir
authors.forename: Benjamin
authors.initials: B
authors.lastname: Brenner
keywords: Heparanase; cancer; tissue factor; tissue factor pathway inhibitor
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