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• W2014281330 abstract "It has been suggested that toxic oxygen free radicals can be involved in the pathogenesis of systemic sclerosis (scleroderma) (SSc). Because the cells that contribute to the generation of free radicals are not known, our aim was (i) to evaluate the ability of unmanipulated and phorbol 12-myristate 13-acetate-stimulated monocytes and polymorphonucleate neutrophils of SSc patients to generate superoxide anion (O2*-); and (ii) to investigate whether the O2*- produced by these cells involved the activation of nicotinamide-adenine dinucleotide diphosphate oxidase biochemical pathway. Employing the superoxide dismutase-inhibitable reduction of cytochrome c to evaluate the generation of O2*-, unmanipulated monocytes of SSc patients generated more O2*- than primary Raynaud's phenomenon patients and normal control monocytes (p = 0.0001), and the release was higher in patients with diffuse cutaneous involvement and 5 y or less disease duration (p = 0.02). The involvement of nicotinamide-adenine dinucleotide diphosphate oxidase in the enhanced 02*- production was demonstrated by the finding that the cytosolic components of the enzyme, p47phox and p67phox, were both translocated to the plasma membrane of enriched but otherwise unmanipulated monocytes of SSc patients. The involvement of mitochondrial oxidases was excluded by the lack of inhibition of O2*- production when monocytes were incubated in the presence of rotenone, a mitochondrial oxidase inhibitor. Upon stimulation with phorbol 12-myristate 13-acetate, monocytes of SSc patients produced more O2*- than controls. In SSc patients untreated polymorphonucleate neutrophils generated significantly less O2*- than monocytes (p = 0.0001) and only slightly more than polymorphonucleate neutrophils of primary Raynaud's phenomenon patients and normal controls (p = 0.03). In conclusion, we demonstrate that in patients with scleroderma, unmanipulated and phorbol 12-myristate 13-acetate-stimulated monocytes release in vitro increased amounts of superoxide anion through the activation of nicotinamide-adenine dinucleotide diphosphate oxidase and, thus, contribute to the oxidative stress found in this disease." @default.
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• W2014281330 date "1999-01-01" @default.
• W2014281330 modified "2023-10-18" @default.
• W2014281330 title "Monocytes of Patients with Systemic Sclerosis (Scleroderma) Spontaneously Release In Vitro Increased Amounts of Superoxide Anion" @default.
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• W2014281330 doi "https://doi.org/10.1046/j.1523-1747.1999.00476.x" @default.
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