Activation of prothrombin in the presence of human umbilical-vein endothelial cells.
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ABSTRACT: Addition of Factor Xa, Factor Va and prothrombin to immobilized cultured human umbilical-vein endothelial cells resulted after a time delay in thrombin formation. The prothrombin-converting (prothrombinase) activity, however, was not associated with the cell surface. Rather, perturbation by thrombin, either formed in situ or exogenously added, induced a procoagulant phospholipid surface in the fluid phase, which, in the presence of Factor Xa and Factor Va, enabled the assembly of prothrombinase.
SUBMITTER: Schoen P
PROVIDER: S-EPMC1130741 | biostudies-other | 1992 Feb
REPOSITORIES: biostudies-other
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