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- W2888968541 abstract "Communication between neutrophils and platelets was previously investigated by measuring platelet aggregation, serotonin release and changes in cytosolic free calcium subsequent to specific stimulation of neutrophils by fMet-Leu-Phe (FMLP) in a suspension of both cell types. The addition of the chemotactic peptide was shown to elicit secondary platelet activation as a consequence of primary stimulation of neutrophils. Cell-free supernatants from FMLP-stimulated neutrophils were capable of inducing platelet activation thus demonstrating that a factor released bv neutrophils was responsible for the observed platelet responses. After eliminating classical platelet agonists as the acitive agent, it was shown that an enzyme termed neutroohilin induced platelet calcium mobilization, secretion and aggregation. The current studies were conducted to characterize the mediator released bv neutrophils. Neutrophilin bound bo cation exchange resins but failed to bind to anion exchangers. The biological activity associated with neutroohilin was unaffected by leupeptin, only very weakly diminished by N-bosyl-Lvs-chloromethvl ketone and was strongly inhibited by N-tosvl-Phe-chloromethvl ketone, aloha-l-antitrvpsin, soybean trypsin inhibitor and Z-Glv-Leu-Phe-chloromethvl ketone. Neutroohilin was released from stimulated neutrophils only after cytochalasin B treatment, as was beta-glucuronidase, suggesting that both enzymes are located in azurophilic granules. Neutroohilin-induced platelet activation was inhibited bv antiserum to human catheosin G in a dose-deoendent manner but was unaffected by antiserum to human elastase or alpha-fetoprotein. The inhibitor sensitivity, immunological cross-reactivity, ionic properties and probable subcellular localization indicate that neutrophilin is a cationic chymotrvosin-like enzyme related, if not identical to, catheosin G. Neutroohilin-induced platelet activation could explain different pathological events in which platelets and neutroohils are known to be involved." @default.
- W2888968541 created "2018-09-07" @default.
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- W2888968541 date "1987-01-01" @default.
- W2888968541 modified "2023-09-23" @default.
- W2888968541 title "CHARACTERIZATION OF A NEUTROPHIL CPYMOTRYPSIN-LIKE ENZYME THAT ACTIVATES PLATELETS" @default.
- W2888968541 doi "https://doi.org/10.1055/s-0038-1643157" @default.
- W2888968541 hasPublicationYear "1987" @default.
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