BACKGROUND: The endothelium is a major source of tissue factor pathway inhibitor (TFPI), the endogenous regulator of TF-induced coagulation, and a significant proportion of the expressed TFPI remains associated with the endothelial surface. METHODS AND RESULTS: Phosphatidylinositol-specific phospholipase C (PI-PLC) treatment reduced TFPI at the surface of cultured endothelial cells by approximately 80%, and at least a portion of the TFPI released by PI-PLC contained an intrinsic glycosylphosphatidylinositol (GPI) anchor that is recognized by anti-crossreactive determinant antibodies. Endothelial cells express both of the alternatively spliced forms of TFPI mRNA at a ratio of TFPIbeta/TFPIalpha mRNA of approximately 0.1 to 0.2. In Chinese hamster ovary (CHO) cells, TFPIalpha is predominantly secreted, whereas TFPIbeta is a GPI-anchored membrane protein. Like TFPIbeta, the small proportion of the TFPIalpha expressed by CHO cells that remains surface associated is also released by PI-PLC treatment, suggesting that it is bound to a separate GPI-anchored protein(s) at the surface of the cells. CONCLUSIONS: Both direct (TFPIbeta) and indirect (TFPIalpha) GPI-mediated membrane anchorage is involved in localizing TFPI to the surface of cells.
BACKGROUND: The endothelium is a major source of tissue factor pathway inhibitor (TFPI), the endogenous regulator of TF-induced coagulation, and a significant proportion of the expressed TFPI remains associated with the endothelial surface. METHODS AND RESULTS:Phosphatidylinositol-specific phospholipase C (PI-PLC) treatment reduced TFPI at the surface of cultured endothelial cells by approximately 80%, and at least a portion of the TFPI released by PI-PLC contained an intrinsic glycosylphosphatidylinositol (GPI) anchor that is recognized by anti-crossreactive determinant antibodies. Endothelial cells express both of the alternatively spliced forms of TFPI mRNA at a ratio of TFPIbeta/TFPIalpha mRNA of approximately 0.1 to 0.2. In Chinese hamster ovary (CHO) cells, TFPIalpha is predominantly secreted, whereas TFPIbeta is a GPI-anchored membrane protein. Like TFPIbeta, the small proportion of the TFPIalpha expressed by CHO cells that remains surface associated is also released by PI-PLC treatment, suggesting that it is bound to a separate GPI-anchored protein(s) at the surface of the cells. CONCLUSIONS: Both direct (TFPIbeta) and indirect (TFPIalpha) GPI-mediated membrane anchorage is involved in localizing TFPI to the surface of cells.
Authors: Nadine Müller-Calleja; Anne Hollerbach; Svenja Ritter; Denise G Pedrosa; Dennis Strand; Claudine Graf; Christoph Reinhardt; Susanne Strand; Philippe Poncelet; John H Griffin; Karl J Lackner; Wolfram Ruf Journal: Blood Date: 2019-08-21 Impact factor: 22.113
Authors: Susan A Maroney; Sandra L Haberichter; Paul Friese; Maureen L Collins; Josephine P Ferrel; George L Dale; Alan E Mast Journal: Blood Date: 2006-11-02 Impact factor: 22.113
Authors: K F Eddy Lee; Evelyn J Salvaris; Jean-Christian Roussel; Simon C Robson; Anthony J F d'Apice; Peter J Cowan Journal: Xenotransplantation Date: 2008 May-Jun Impact factor: 3.907