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• W1482120357 abstract "Neutrophils stimulated with phorbol myristate acetate (PMA) in the presence of the spin trap 5,5-dimethyl-1-pyrroline 1-oxide (DMPO), dimethyl sulfoxide, and diethylenetriaminepentaacetic acid (DETAPAC) fail to generate hydroxyl radical (.OH), detected as the methyl spin-trapped adduct of DMPO (2,2,5-trimethyl-1-pyrrolidinyloxyl, DMPO-CH3), unless ferric salts (Fe3+) are also added (Britigan, B. E., Rosen, G. M., Chai, Y., and Cohen, M. S. (1986) J. Biol. Chem. 261, 4426-4431). Even then, .OH formation wanes in spite of ongoing superoxide (O2-.) production. In contrast, ferric salt supplementation of a hypoxanthine/xanthine oxidase O2-. generating system containing DETAPAC produces continual .OH, suggesting that neutrophils limit the formation of this free radical. To evaluate this hypothesis, neutrophil cytoplasts (largely devoid of granules but able to generate O2-.) were stimulated with PMA in the presence of Fe3+, DETAPAC, dimethyl sulfoxide, and DMPO. This resulted in continual production of DMPO-CH3. In the presence of dimethyl sulfoxide, HL-60 (promyelocytic) cells differentiate into cells similar in morphology and O2-. generating capacity to neutrophils. However, their granules lack the iron-binding protein lactoferrin (LF). Ferric salt supplementation of HL-60 cells stimulated with PMA yielded an EPR spectrum similar to cytoplasts. Supernatant obtained following PMA-induced neutrophil degranulation (which releases LF extracellularly) suppressed DMPO-CH3 formation by the hypoxanthine/xanthine oxidase/Fe3+/DETAPAC system. Anti-LF antibody, but not anti-transferrin antibody, prevented stimulated neutrophil supernatant inhibition of hypoxanthine/xanthine oxidase/Fe3+/DETAPAC-mediated .OH formation. Similarly, neutrophils stimulated with PMA in the presence of Fe3+, DETAPAC, and anti-LF antibody (but not anti-transferrin antibody) demonstrated continual formation of .OH. Neutrophil degranulation of LF limits Fe3+-catalyzed .OH formation which in vivo could protect tissue from possible .OH-mediated injury." @default.
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• W1482120357 date "1986-12-01" @default.
• W1482120357 modified "2023-10-16" @default.
• W1482120357 title "Stimulated human neutrophils limit iron-catalyzed hydroxyl radical formation as detected by spin-trapping techniques." @default.
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• W1482120357 doi "https://doi.org/10.1016/s0021-9258(19)75994-8" @default.
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