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- W2029389633 abstract "1 The roles of chymase in acute allergic responses are not clear, despite the relative abundance of this serine proteinase in the secretory granules of human mast cells. We have isolated chymase to high purity from human skin tissue by heparin-agarose affinity chromatography and Sephacryl S-200 gel filtration procedures, and have investigated the ability of human mast cell chymase to stimulate cell accumulation following injection into laboratory animals. 2 Injection of chymase provoked marked neutrophilia and eosinophilia in the skin of Dunkin Hartley guinea-pigs. Compared with saline injected control animals, there were some 60 fold more neutrophils and 12 fold more eosinophils present at the injection site. 3 Following injection of chymase into the peritoneum of BALB/c mice, there were up to 700 fold more neutrophils, 21 fold more eosinophils, 19 fold more lymphocytes and 7 fold more macrophages recovered than from saline injected controls at 16 h. Doses of chymase as low as 5 ng (1.7×10−13 mole) stimulated an inflammatory infiltrate, and significant neutrophilia was elicited within 3 h. 4 The chymase induced cell accumulation in both the guinea-pig and mouse models was dependent on an intact catalytic site, being reduced by co-injection of proteinase inhibitors or heat inactivation of the enzyme. 5 Co-injection of histamine or heparin significantly reduced the chymase induced neutrophil accumulation, whereas neither histamine nor heparin by themselves had any effect on the accumulation of nucleated cells. No synergistic or antagonist interactions between chymase and tryptase were observed when these two major mast cell proteinases were co-injected into the mouse peritoneum. 6 Our findings suggest that chymase may provide an potent stimulus for inflammatory cell recruitment following mast cell activation. British Journal of Pharmacology (1998) 125, 1491–1500; doi:10.1038/sj.bjp.0702223" @default.
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- W2029389633 date "1998-12-01" @default.
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- W2029389633 title "Human mast cell chymase induces the accumulation of neutrophils, eosinophils and other inflammatory cells<i>in vivo</i>" @default.
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- W2029389633 doi "https://doi.org/10.1038/sj.bjp.0702223" @default.
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