Alveolar macrophages are cell's important in immune defense and inflammation in the lung, and the coagulation system participates in these reactions. In earlier experiments, it was found that alveolar macrophages contain and produce tissue factor, the extrinsic clotting pathway activator. The present experiments explore possible production by alveolar macrophages of the sequence of the clotting...

BACKGROUND The contribution of hypercoagulability to the pathophysiology of sickle cell disease (SCD) remains poorly defined. We sought to evaluate the association of markers of coagulation and platelet activation with specific clinical complications and laboratory variables in patients with SCD. DESIGN AND METHODS Plasma markers of coagulation activation (D-dimer and TAT), platelet activatio...

BACKGROUND Phospholipases A(2) (PLA(2)) are aggressive enzymes that can destroy phospholipids of cell membranes. The resulting cell fragments trigger the kallikrein-mediated contact phase of coagulation. The aim of the present study was to expose citrated whole blood to PLA(2) and to quantify thrombin generation in recalcified plasma. METHODS Normal citrated blood was exposed to bovine pancre...

Recent studies have indicated that endothelial cell function includes elaboration of growth factors and regulation of coagulation. In this paper we demonstrate that activated coagulation Factor X (Factor Xa), a product of the coagulation mechanism generated before thrombin, induces enhanced release of endothelial cell mitogens, linking these two functions. Mitogenic activity generated by cultur...

Phosphodiesterase (PDE) enzyme activity was screened in four Egyptian snake venoms belonging to families Elapidae and Viperadae and a highly active enzyme (Nn-PDEII), from the richest snake venom species Naja nigricollis, was purified and characterized in a set of biochemical, immunological and biological assays. Purification was followed in two successive steps including gel filtration and ion...

Background Hemophilia A and B are disorders resulting from a deficiency in factor VIII (FVIII), and factor IX (FIX), respectively. Tissue Factor (TF) is a key component of the extrinsic pathway and plays a role in the coagulation defect of hemophilic blood. Neutralizing the activity of TFPI represents a promising treatment concept in patients with hereditary or acquired hemophilia. ARC19499 is ...

The general hypothesis for the biological function of 112W glycoprotein I is that it neutralizes all negatively charged macromolecules that might enter the bloodstream and diminishes unwanted activation of the blood coagulation. In the present study we report that $2-glycoprotein I inhibits the activation of the contact phase system of the intrinsic pathway of blood coagulation. Activation was ...

it has been recognized that patients with cyanotic congenital heart disease (cchd) show significant bleeding tendency which can be secondary to coagulopathies in these patients. some coagulation abnormalities are thrombocytopenia, factor deficiencies, fibrinolysis and disseminated intravascular coagulation  (dic). according to high prevalence of cchd and major operations in theses patients, the...