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• W74972989 abstract "The present studies were undertaken to characterize a serine protease released by N-formyl-L-Met-L-Leu-L-Phe (fMet-Leu-Phe)-stimulated neutrophils that rapidly induces platelet calcium mobilization, secretion and aggregation. The biological activity associated with this protease was unaffected by leupeptin, was only weakly diminished by N-p-tosyl-L-Lys-chloromethane, but was strongly inhibited by alpha 1-antitrypsin, soyabean trypsin inhibitor, N-tosyl-L-Phe-chloromethane and benzoyloxycarbonyl-Gly-Leu-Phe-chloromethane (Z-Gly-Leu-PheCH2Cl). These observations indicated that the biological activity of neutrophil supernatants could be attributed to a chymotrypsin-like enzyme such as cathepsin G. Furthermore, platelet aggregation and 5-hydroxytryptamine release induced by cell-free supernatants from fMet-Leu-Phe-stimulated neutrophils were found to be blocked by antiserum to cathepsin G in a concentration-dependent manner but were unaffected by antiserum to elastase. The biological activity present in neutrophil supernatants co-purified with enzymic activity for cathepsin G during sequential Aprotinin-Sepharose affinity chromatography and carboxymethyl-Sephadex chromatography. SDS/polyacrylamide-gel electrophoresis of the reduced, purified protein, demonstrated three polypeptides with apparent Mr values of 31,500, 29,000 and 28,000 and four polypeptides were resolved on acid-gel electrophoresis. Purified cathepsin G from neutrophils cross-reacted with anti-(cathepsin G) serum in a double immunodiffusion assay and elicited platelet calcium mobilization, 5-hydroxytryptamine secretion and aggregation. Calcium mobilization and secretion induced by low concentrations of cathepsin G were partially dependent on arachidonic acid metabolites and ADP, while stimulation by higher enzyme concentrations was independent of amplification pathways, indicating that cathepsin G is a strong platelet agonist. These results suggest that pathological processes which stimulate neutrophils and release cathepsin G can in turn result in the recruitment and activation of platelets." @default.
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• W74972989 date "1988-04-01" @default.
• W74972989 modified "2023-10-18" @default.
• W74972989 title "Cathepsin G is a strong platelet agonist released by neutrophils" @default.
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• W74972989 doi "https://doi.org/10.1042/bj2510293" @default.
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