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- W2025197593 abstract "Upon stimulation by various ligands, freshly isolated human peripheral neutrophils (PMN) respond in a variety of ways, such as superoxide (O2-.) generation, phagocytosis enzyme release, migration etc. Chemotactic peptide formylmethionyl-leucyl-phenylalanine (FMLP) and opsonized zymosan activate neutrophils by a receptor-mediated mechanism, while phorbol myristate acetate and dioctanoylglycerol activate the cells by a mechanism involving Ca(2+)-and phospholipid-dependent protein kinase (PKC). Receptor-mediated but not PKC-mediated O2-. generation in PMN was enhanced by the priming of recombinant human granulocyte colony stimulating factor (G-CSF). FMLP-dependent luminol chemiluminescence was also enhanced by G-CSF. However, no appreciable enhancement was observed in FMLP-induced intracellular calcium ion concentration ([Ca2+]i). Enhancement of FMLP-induced generation of O2-. by G-CSF was inhibited by genistein or alpha-cyano-3-ethoxy-4-hydroxy-5-phenylthiomethylcinnamamide (ST 638), inhibitors of tyrosine kinase (TK), and was stimulated by staurosporine and 1-(5-isoquinolinesulfonyl)-3-methyl-piperazine (H-7), inhibitors of PKC. The ED50 values of genistein and ST 638 for the inhibition of the FMLP-induced O2-. generation from G-CSF were 0.5 and 5 microM, respectively. In contrast, O2-. generation by PKC activation without G-CSF priming was inhibited by stauroporine and H-7, but was stimulated by genistein and ST 638. These results suggested that the enhancing effect of G-CSF on receptor-mediated generation of the O2-. might be regulated by protein kinases, such as TK and PKC, and that the TK inhibitor selectively inhibited the G-CSF-primed receptor-mediated O2-. generation of neutrophils." @default.
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- W2025197593 date "1992-09-01" @default.
- W2025197593 modified "2023-09-23" @default.
- W2025197593 title "Neutrophil priming by granulocyte colony stimulating factor and its modulation by protein kinase inhibitors" @default.
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- W2025197593 doi "https://doi.org/10.1016/0006-2952(92)90366-q" @default.
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