We have developed a radioimmunoassay for human thrombin using rabbit anti-human thrombin IgG. The assay can measure 2 ng thrombin/ml plasma, 500-fold more sensitive than clotting assays. Human prothrombin is less reactive in the assay than thrombin by at least four orders of magnitude, and there is no demonstrable cross-reactivity with human factor Xa, the clotting factor structurally most simi...

background: factor v g1691a (fv leiden), fii ga20210, and methylenetetrahydrofolate reductase (mthfr) c677t mutations are the most common genetic risk factors for thromboembolism in the western countries. however, there is rare data in iran about cerebral venous and sinus thrombosis (cvst) patients. the aim of this study was to evaluate the frequency of common genetic thrombophilic factors in c...

S THE NUMBER of known intrinsic clotting factors has increased, it has become clear that the final reaction, the conversion of fibrinogen to fibrin by thrombin, must result from a series of preliminary reactions, each probably involving only two clotting factors. This means that each clotting factor must circulate either as a precursor or as a highly specific molecule which only reacts with ano...

Heparin cofactor II is a plasma protein that inhibits thrombin rapidly in the presence of either heparin or dermatan sulfate. We have determined the effects of two glycosaminoglycan-binding proteins, i.e., histidine-rich glycoprotein and platelet factor 4, on these reactions. Inhibition of thrombin by heparin cofactor II and heparin was completely prevented by purified histidine-rich glycoprote...

The process of human blood clotting involves a complex interaction of continuous-time/continuous-state processes and discrete-event/discrete-state phenomena, where the former comprise the various chemical rate equations (which can be written as differential equations) and the latter comprise both threshold-limited behaviors and qualitative facets of the coagulation cascade. We model this proces...

background: recurrent pregnancy loss (rpl) caused by various genetic and non-genetic factors. after chromosome abnormality, thrombophilia is one of the most important genetic factors that could cause rpl. factor v leiden and factor ii g20210a mutation were the most common mutations cause thrombophilia in the world. objective: the purpose of this study was to determine the frequency of factor v ...

A rabbit model in which intrinsic clotting was selectively impaired by injection of a human factor VIII antibody was used to evaluate the mechanism of endotoxininduced intravascular clotting in cortisonetreated rabbits. Three groups of animals were studied: a control group given factor VIII antibody followed by saline; a second control group given an inert material followed by endotoxin; and an...

Tissue factor (TF) is a low molecular weight glycoprotein that initiates the clotting cascade and is considered to be a major regulator of coagulation, hemostasis, and thrombosis. TF is not expressed in the intima or media of normal adult blood vessels. Accordingly, it has been hypothesized that the initiation of intravascular coagulation may require the "induced" expression of TF in the vessel...