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• W2100696503 abstract "Because low tumor necrosis factor-alpha (TNF-alpha) production has been reported in malnourished children, in contrast with high production of TNF-alpha in experimental protein-energy malnutrition, we reevaluated the production of TNF-alpha in whole blood cultures from children with primary malnutrition free from infection, and in healthy sex- and age-matched controls. Mononuclear cells in blood diluted 1:5 in endotoxin-free medium released TNF-alpha for 24 h. Spontaneously released TNF-alpha levels (mean +/- SEM), as measured by enzyme immunoassay in the supernatants of unstimulated 24-h cultures, were 10,941 +/- 2,591 pg/ml in children with malnutrition (N = 11) and 533 +/- 267 pg/ml in controls (N = 18) (P < 0.0001). TNF-alpha production was increased by stimulation with lipopolysaccharide (LPS), with maximal production of 67,341 +/- 16,580 pg/ml TNF-alpha in malnourished children and 25,198 +/- 2,493 pg/ml in controls (P = 0.002). In control subjects, LPS dose-dependently induced TNF-alpha production, with maximal responses obtained at 2000 ng/ml. In contrast, malnourished patients produced significantly more TNF-alpha with 0.02-200 ng/ml LPS, responded maximally at a 10-fold lower LPS concentration (200 ng/ml), and presented high-dose inhibition at 2000 ng/ml. TNF-alpha production a) was significantly influenced by LPS concentration in control subjects, but not in malnourished children, who responded strongly to very low LPS concentrations, and b) presented a significant, negative correlation (r = -0.703, P = 0.023) between spontaneous release and the LPS concentration that elicited maximal responses in malnourished patients. These findings indicate that malnourished children are not deficient in TNF-alpha production, and suggest that their cells are primed for increased TNF-alpha production." @default.
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• W2100696503 date "2005-02-01" @default.
• W2100696503 modified "2023-10-18" @default.
• W2100696503 title "Increased production of tumor necrosis factor-alpha in whole blood cultures from children with primary malnutrition" @default.
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• W2100696503 doi "https://doi.org/10.1590/s0100-879x2005000200005" @default.
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