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- W1527364769 abstract "Abstract Data presented in this paper indicate that polymorphonuclear leukocyte (PMN) Fc receptor-mediated phagocytosis can be markedly augmented and that this augmentation is under regulatory control. Stimulation of PMN with either a low m.w., heat-labile cytokine(s) (the culture supernatant effluent from a YM-10 Centricon unit, YM-10E), phorbol esters (phorbol dibutyrate), or the polyene antibiotic, amphotericin B, enhances Fc-mediated ingestion in a dose-dependent manner. YM-10 effluent- and amphotericin B-stimulated ingestion is completely abrogated by treating the PMN with either pertussis toxin (PT), cholera toxin (CT), or a monoclonal antibody (mAb), 1C2. However, neither toxin nor mAb 1C2 affects nonstimulated ingestion or phagocytosis stimulated by phorbol esters or synthetic diacylglycerol. Increasing intracellular cyclic adenosine monophosphate levels by stimulation with prostaglandin E1 and the phosphodiesterase inhibitor, isobutylmethylxanthine, does not mimic the effect of either toxin or mAb 1C2. In addition, toxin-mediated inhibition is not due to loss of either the Fc receptor recognized by mAb 3G8 or the antigen recognized by mAb 1C2. These data indicate that both CT and PT regulate the phagocytic response of PMN, in a manner like mAb 1C2, probably by affecting a guanosine 5'-triphosphate-binding protein distinct from those that regulate adenylate cyclase. Since phorbol ester-stimulated ingestion is not inhibited by either PT, CT, or mAb 1C2 and phorbol esters activate protein kinase C directly, phagocytosis amplification regulated by PT, CT, and mAb 1C2 may involve protein kinase C activation." @default.
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- W1527364769 date "1987-12-15" @default.
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- W1527364769 title "Cholera toxin and pertussis toxin regulate the Fc receptor-mediated phagocytic response of human neutrophils in a manner analogous to regulation by monoclonal antibody 1C2." @default.
- W1527364769 doi "https://doi.org/10.4049/jimmunol.139.12.4159" @default.
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