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- W1517556112 abstract "Abstract The expression of the novel b-type cytochrome, which is part of the superoxide anion (O2-)-generating system in phagocytes, has been investigated in population of mouse peritoneal macrophages heterogeneous in their capability to produce O2-). Reduced minus oxidized difference spectra of intact cells showed the appearance of a b-type cytochrome with major peaks in the alpha region at 558 to 559 nm and in the gamma region at 426 to 428 nm. Resident peritoneal macrophages, as well as thioglycollate broth-elicited and Corynebacterium Parvum-activated macrophages and neutrophils expressed about 50 pmol cytochrome b/10(7) cells. In intact macrophages and neutrophils, Na-dithionite reduced greater than 75% of the cytochrome b measurable in disrupted cells. No correlation was found between capability to produce O2-) by different population of macrophages and their content of cytochrome b. When stimulated in strictly anaerobic conditions with phorbol myristic acetate, macrophages activated in vivo by i.p. injection of Corynebacterium Parvum reduced approximately 40% of their total cytochrome b. In resident peritoneal macrophages that produced five times lower amounts of O2-, cytochrome b reduction was instead undetectable. Potentiometric properties of cytochrome b was investigated in macrophage subcellular particles. Both resident and Corynebacterium Parvum-activated macrophages revealed the presence of b chromophores with very low potentials of -255 and -244 mV, respectively, whose content was not different in the two populations. These results show that resident and activated macrophages express the same amount of cytochrome b, but upon stimulation with PMA, activated macrophages recruit a higher number of cytochrome b molecules in parallel with an enhanced production of O2-." @default.
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- W1517556112 date "1986-02-15" @default.
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- W1517556112 title "Molecular basis of macrophage activation. Expression of the low potential cytochrome b and its reduction upon cell stimulation in activated macrophages." @default.
- W1517556112 doi "https://doi.org/10.4049/jimmunol.136.4.1393" @default.
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