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BACKGROUND Thrombin is the most potent agonist of platelets and plays a critical role in the development of arterial thrombosis. Human platelets express dual thrombin receptors, protease-activated receptor (PAR) 1 and PAR4; however, there are no therapeutic strategies that effectively target both receptors. METHODS AND RESULTS Platelet aggregation studies(More)
Sepsis is a deadly disease characterized by considerable derangement of the proinflammatory, anti-inflammatory and coagulation responses. Protease-activated receptor 1 (PAR1), an important regulator of endothelial barrier function and blood coagulation, has been proposed to be involved in the lethal sequelae of sepsis, but it is unknown whether activation(More)
The chemokine receptor CXCR4, which normally regulates stromal stem cell interactions in the bone marrow, is highly expressed on a variety of malignant hematologic cells, including lymphoma and lymphocytic leukemias. A new treatment concept has arisen wherein CXCR4 may be an effective therapeutic target as an adjunct to treatment of hematologic neoplasms(More)
The aerial parts and roots of Leontopodium alpinum Cass. (Asteraceae) were investigated for their in vivo topical anti-inflammatory activity using the inhibition of Croton oil-induced ear dermatitis in mice. For both of the plant parts, the dichloromethane extract induced a dose-dependent oedema reduction, being more active than the methanol and 70% aqueous(More)
OBJECTIVE Antithrombin exerts direct effects on neutrophils by inhibiting chemokine-induced migration. This study examined the potency of different pharmaceutical antithrombin preparations in inhibiting neutrophil chemotaxis toward interleukin 8. METHODS Cell migration was tested by the leading front assay in modified Boyden microchemotaxis chambers(More)
BACKGROUND Eosinophil infiltration is a characteristic feature of allergic inflammation. Allergic responses are associated with local activation of the coagulation pathway and accumulation of fibrin. OBJECTIVE We tested whether protein C and activated protein C (APC), which are endogenous anti-inflammatory coagulation inhibitors, affect eosinophil(More)
Platelet activation and aggregation is considered a crucial step in the initiation and aggravation of arterial thrombosis. ADP from activated platelets is recognized as major factor in thrombus formation and is a potent stimulator of oxygen-free radical release from neutrophils. The aim of the present investigation was to determine in vitro the direct(More)
BACKGROUND Secretoneurin is an abundant neuropeptide of the central, peripheral, and autonomic nervous systems, located in nerve fibers characterized by a close interaction with blood vessels and known to stimulate endothelial cell migration. METHODS AND RESULTS We hypothesized that secretoneurin might act as an angiogenic cytokine and tested for these(More)
Matrix metalloproteases (MMPs) play important roles in normal and pathological remodeling processes including atherothrombotic disease, inflammation, angiogenesis, and cancer. MMPs have been viewed as matrix-degrading enzymes, but recent studies have shown that they possess direct signaling capabilities. Platelets harbor several MMPs that modulate(More)