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• W2069316512 abstract "Several experimental findings suggest a potential role of excessive nitric oxide (NO) production by macrophages, microglia and astrocytes in the pathogenesis of demyelinating lesions in MS. We assessed the production of nitrites by peripheral blood mononuclear cells (PBMCs) of 15 MS patients (10 F and 5 M) with the R-R form (EDSS: 1-3.0) and in 15 age-matched control subjects. 9 out of the 15 MS patients showed active lesions in MRI at the time of examination. 7 patients were also monitored at the onset, during and following a clinical relapse. Secretion of cytokines by PBMCs was assessed at the basal time and after 24 h of incubation with lipopolysaccharide (LPS). The production of nitrites in the supernatants of PBMCs stimulated and not stimulated with lipopolysaccharide was evaluated. The secretion of IL1 beta, IFN-gamma, TNF-alpha, IL-6 IL-10 and TGF-beta by PBMCs was detected using ELISA methods. The production of NO, both basal and stimulated, was significantly higher in the patients with active lesions than in those without active lesions (p < 0.01). No significant difference was evident between the basal and LPS-stimulated production of NO between control subjects and MS patients without active lesions. During relapses there was a significant increase in NO production by PBMCs compared to the clinical stable stage of the disease (p < 0.0001). This increase was significantly greater in the early stage of relapse than in the late stage (p < 0.04). A decline of NO levels was observed during recovery. Steroid treatment induced a significant decrease in the PBMC NO production of MS patients during exacerbations (p < 0.01). The levels of IL-1 beta, IFN-gamma and TNF-alpha are significantly higher in the supernatants of the PBMCs which produced greater amounts of NO (p < 0.02, p < 0.03, p < 0.01, respectively). On the other hand, NO levels were negatively related to IL-10 and TGF-beta production (R = -75, p < 0.0001 and R = -0.79, p < 0.0001, respectively). The increase production of NO by peripheral blood mononuclear cells demonstrated in our study to be associated with increased production of proinflammatory cytokines could therefore be considered to be a marker of mononuclear cell activation in the peripheral blood of MS patients and, indirectly, of disease activity. Its increased secretion during T cell and monocyte homing in the CNF could contribute to the damage to the blood-brain barrier and the subsequent cytokine-mediated cytotoxic effect to myelin and oligodendrocytes in the white matter of MS patients." @default.
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• W2069316512 date "1997-12-01" @default.
• W2069316512 modified "2023-09-27" @default.
• W2069316512 title "Cytokine secretion and nitric oxide production by mononuclear cells of patients with multiple sclerosis" @default.
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• W2069316512 doi "https://doi.org/10.1016/s0165-5728(97)00136-7" @default.
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