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- W309267999 abstract "Abstract We studied the effect of tumor necrosis factor (TNF) and gamma interferon (IFN-gamma), alone and in combination, on the expression of chemotactic peptide receptors, stimulus-induced actin polymerization, hydrogen peroxide production (H2O2), and expression of nonspecific esterase (NSE) positivity in human promyelocytic leukemic cell line HL- 60. These parameters were analyzed following a five-day culture with the cytokines. Chemotactic peptide receptor expression was studied using the fluoresceinated hexapeptide, formyl-norleucyl-leucyl- phenylalanyl-norleucyl-tyrosyl-lysine and flow cytometry. Actin polymerization, an important event required for chemotaxis and phagocytosis, was studied using NBD-phallacidin labeling, following stimulation with the chemotactic peptide formyl-methionyl-leucyl- phenylalanine (FMLP) or phorbol myristate acetate (PMA). TNF increased the expression of chemotactic peptide receptors in a dose-dependent fashion, and there was good correlation between the receptor expression, stimulus-induced actin polymerization, H2O2 production, and NSE positivity. IFN-gamma was less potent in inducing all the parameters studied but exerted a positive cooperative effect when combined with TNF. IFN-gamma at high concentrations induced chemotactic peptide receptors comparable in magnitude to that seen with TNF but failed to prime these cells to undergo actin polymerization in response to FMLP or PMA. Undifferentiated HL-60 cells showed a decrease in F- actin content on stimulation with PMA. This suggests that protein kinase C might have a negative regulatory role in stimulus-induced actin polymerization. The observations reported here indicate that appropriate combinations of different inducing agents with different modes of action might be necessary to duplicate the functional abilities of mature phagocytic cells." @default.
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- W309267999 date "1988-04-01" @default.
- W309267999 modified "2023-09-29" @default.
- W309267999 title "Cooperative effect of tumor necrosis factor and gamma-interferon on chemotactic peptide receptor expression and stimulus-induced actin polymerization in HL-60 cells" @default.
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- W309267999 doi "https://doi.org/10.1182/blood.v71.4.1062.1062" @default.
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