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  • Title: Cationic proteins of human granulocytes: Enhancement of phagocytosis ofStaphylococcus protein A-IgG complexes.
    Author: Hällgren R, Venge P.
    Journal: Inflammation; 1976 Jun; 1(3):237-46. PubMed ID: 24194448.
    Abstract:
    The antibacterial chymotrypsin-like cationic protein of human granulocytes is shown to enhance the phagocytosis ofStaphylococcus protein A-IgG complexes by human granulocytes. The enhancement is time- and dose-dependent, and it is inhibited by heat inactivation of the chymotrypsin-like cationic protein. Granulocyte elastase and trypsin give a similar enhancement. The chymotrypsin-like cationic protein-mediated enhancement is poorly inhibited byα 1-antitrypsin. There is a need for approximately 20 molα 1-antitrypsin to inhibit 1 mol chymotrypsin-like cationic protein. Elastase is effectively inhibited at a 1∶1 molar relationship. Kinetic studies suggest that phagocytosis enhancement by chymotrypsin-like cationic protein may be due to modification of the Fc-receptor with concomitantly increased affinhy of the protein A-IgG complex.
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