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• W2024101513 abstract "Corticosteroids partially suppress cytokine production by chronic obstructive pulmonary disease (COPD) alveolar macrophages. p38 mitogen-activated protein kinase (MAPK) inhibitors are a novel class of anti-inflammatory drug. We have studied the effects of combined treatment with a corticosteroid and a p38 MAPK inhibitor on cytokine production by COPD alveolar macrophages, with the aim of investigating dose-sparing and efficacy-enhancing effects. Alveolar macrophages from 10 patients with COPD, six smokers, and six nonsmokers were stimulated with lipopolysaccharide (LPS) after preincubation with five concentrations of dexamethasone alone, five concentrations of the p38 MAPK inhibitor 1-(5-<i>tert</i>-butyl-2-<i>p</i>-tolyl-2<i>H</i>-pyrazol-3-yl)-3(4-(2-morpholin-4-yl-ethoxy)naphthalen-1-yl)urea (BIRB-796) alone, and all combinations of these concentrations. After 24 h, the supernatants were analyzed for interleukin (IL)-8, IL-6, tumor necrosis factor α (TNFα), granulocyte macrophage–colony-stimulating factor (GM-CSF), IL-1α, IL-1β, IL-1ra, IL-10, monocyte chemoattractant protein 3, macrophage-derived chemokine (MDC), and regulated on activation normal T cell expressed and secreted (RANTES). The effect of dexamethasone on p38 MAPK activation was analyzed by Western blotting. Dexamethasone and BIRB-796 both reduced LPS-induced cytokine production in a dose-dependent manner in all subject groups, with no differences between groups. Increasing the concentration of BIRB-796 in combination with dexamethasone produced progressively greater inhibition of cytokine production than dexamethasone alone. There were significant efficacy-enhancing benefits and synergistic dose-sparing effects (<i>p</i> < 0.05) for the combination treatment for IL-8, IL-6, TNFα, GM-CSF, IL-1ra, IL-10, MDC, and RANTES in one or more subject groups. Dexamethasone had no effect on LPS-induced p38 MAPK activation. We conclude that p38 MAPK activation in alveolar macrophages is corticosteroid-insensitive. Combining a p38 MAPK inhibitor with a corticosteroid synergistically enhances the anti-inflammatory effects on LPS-mediated cytokine production by alveolar macrophages from patients with COPD and controls." @default.
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• W2024101513 date "2011-05-24" @default.
• W2024101513 modified "2023-10-01" @default.
• W2024101513 title "Synergistic Effects of p38 Mitogen-Activated Protein Kinase Inhibition with a Corticosteroid in Alveolar Macrophages from Patients with Chronic Obstructive Pulmonary Disease" @default.
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• W2024101513 doi "https://doi.org/10.1124/jpet.111.180737" @default.
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