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• W1997360331 abstract "Purpose: Neutrophil activation has been implicated in the pathophysiologic condition of ischemia-reperfusion injury, the formation of arterial aneurysms, the progression of myocardial ischemia, and the initiation of deep venous thrombosis. Activated neutrophils release cathepsin G, a serine protease, from their granules, which may cause platelet activation that leads to intravascular thrombosis, tissue infarction, and systemic release of the thrombogenic products of platelet granules. This study used flow cytometry to quantify the extent of cathepsin G–induced platelet activation and degranulation through changes in the expression of platelet surface glycoproteins.Methods: Increasing concentrations of human neutrophil–derived cathepsin G were incubated with washed platelets or whole blood from healthy human donors. The platelet surface expression of glycoproteins, including P-selectin, a platelet membrane glycoprotein only expressed after platelet alpha granule release, were determined by quantifying the platelet binding of a panel of fluorescently labeled monoclonal antibodies. Results were compared with the effect of a maximal dose of thrombin, the most potent known platelet activator.Results: In a washed platelet system, cathepsin G increased platelet surface expression of P-selectin (an activation-dependent neutrophil binding site), the glycoprotein IIb/IIIa complex (fibrinogen receptor), and glycoprotein IV (thrombospondin receptor), and decreased surface expression of glycoprotein Ib (von Willebrand factor receptor) to an extent comparable to maximal thrombin. However, these effects were not observed in a whole blood system. Further experiments revealed that preexposure to plasma completely inhibited cathepsin G–induced washed platelet activation and degranulation. Prostacyclin treatment of washed platelets markedly inhibited cathepsin G–induced platelet activation.Conclusions: Cathepsin G is a very potent platelet agonist and degranulator, comparable to maximal thrombin, which alters platelet surface glycoprotein expression for enhanced neutrophil binding and effective platelet aggregation. This study helps to elucidate a possible pathway through which neutrophils may directly activate platelets, leading to intravascular thrombosis, irreversible ischemia, and tissue death in cardiovascular disease states. Patients with diseased endothelium that is deficient in prostacyclin production may be particularly prone to the detrimental effects of neutrophil-derived cathepsin G platelet activation. (J VASC SURG 1994;19:306-19.)" @default.
• W1997360331 created "2016-06-24" @default.
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• W1997360331 date "1994-02-01" @default.
• W1997360331 modified "2023-10-16" @default.
• W1997360331 title "Human neutrophil cathepsin G is a potent platelet activator" @default.
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• W1997360331 doi "https://doi.org/10.1016/s0741-5214(94)70106-7" @default.
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