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- W4233314448 abstract "Plasma kallikrein has been shown to aggregate human neutrophils and release human neutrophil elastase. However, neutrophils resuspended in factor XII-deficient plasma released only 30% of the elastase compared with normal plasma. Isolated human neutrophils were aggregated in a concentration-dependent fashion by 0.06 to 0.6 U/mL factor XIIa (0.022 to 0.22 mumol/L). Factor XIIa (0.1 to 1.0 U/mL) also induced neutrophil degranulation as evidenced by a concentration-dependent release of the specific granule protein, lactoferrin, and azurophilic granule protease, elastase. The release of neutrophil elastase was biphasic, reaching 40% of maximum at 15 seconds with maximal release by 90 minutes. The active site of factor XIIa was required, since the synthetic inhibitor, D-Pro-Phe-Arg-CH2Cl, which reacts with an essential histidine, and the natural plasma inhibitor, Cl-inhibitor, which interacts with the critical serine, both inhibit by more than 90% the release of elastase. The heavy chain is also required, since factor XII fragments failed to aggregate neutrophils or stimulate degranulation. Factor XIIa (0.6 U/mL) can completely correct the defect in elastase release evident in factor XII-deficient plasma. These studies demonstrate that factor XIIa, at concentrations potentially obtainable in plasma in disease states, can activate neutrophils, and thus may participate in the inflammatory response." @default.
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- W4233314448 date "1986-06-01" @default.
- W4233314448 modified "2023-10-16" @default.
- W4233314448 title "Purified plasma factor XIIa aggregates human neutrophils and causes degranulation" @default.
- W4233314448 doi "https://doi.org/10.1182/blood.v67.6.1731.bloodjournal6761731" @default.
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