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- W1569807450 abstract "Abstract We examined phagocytosis of sheep erythrocytes passively sensitized with pneumococcal C-polysaccharide (E-PnC) and of E-PnC coated with C-reactive protein (E-PnC-CRP) by human polymorphonuclear leukocytes (PMN). PMN isolated from blood of normal individuals failed to ingest either E-PnC or E-PnC-CRP; however, after stimulation with 12-O-tetradecanoylphorbol-13-acetate (PMA; 2 ng/ml), PMN ingested E-PnC-CRP efficiently with a mean phagocytic index (PI) of 99.5 +/- 4.8 (mean +/- SD, n = 11), and E-PnC to a lesser extent with a mean PI of 33.2 +/- 11.7 (mean +/- SD, n = 11). PMN that had adhered to PnC-coated glass and that were stimulated with PMA attached but did not ingest E-PnC-CRP. In contrast, PMN plated on E-PnC-CRP-coated glass and stimulated with PMA did not attach or ingest E-PnC-CRP. These data indicate that PMN can be induced to phagocytize PnC-CRP and that both PnC and CRP are required for ingestion. They also suggest that specific receptors for these ligands are expressed by stimulated PMN. Neither attachment nor phagocytosis of E coated with rabbit anti-E IgG (E-IgG) was affected by plating PMN on PnC or PnC-CRP. On the other hand, both phagocytosis and ingestion of E-PnC-CRP as well as E-IgG was blocked by plating PMA-stimulated PMN on immune complexes containing rabbit IgG. Inhibition experiments with the use of 3G8, a monoclonal antibody to the Fc gamma receptor of PMN, and human monomeric IgG1 demonstrated that attachment of E-PnC-CRP is mediated by receptors other than the Fc gamma receptors. These combined results indicated a nonreciprocal association between the putative CRP receptors and the Fc gamma receptors of stimulated PMN, resulting in the clearance of both types of receptors from the apical surface of PMN by antigen-immobilized rabbit IgG." @default.
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- W1569807450 date "1985-05-01" @default.
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- W1569807450 title "Opsonic properties of C-reactive protein. Stimulation by phorbol myristate acetate enables human neutrophils to phagocytize C-reactive protein-coated cells." @default.
- W1569807450 doi "https://doi.org/10.4049/jimmunol.134.5.3364" @default.
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