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• W2087975003 abstract "BackgroundCXCL8/IL-8 is the most significant chemokine for neutrophils, and CXC chemokine receptor (CXCR) 1 and 2 are its 2 receptors, which are downmodulated by CXCL8/IL-8 and endotoxin on activated neutrophils.ObjectiveWe sought to evaluate the expression of the CXCL8/IL-8 receptors and the activation marker CD11b on neutrophils in peripheral blood and in the site of airway inflammation.MethodsThe flow cytometric expression of CXCR1, CXCR2, and CD11b was evaluated on peripheral blood and induced sputum neutrophils in patients with nonsevere asthma with greater than 60% sputum neutrophils, in patients with chronic obstructive pulmonary disease (COPD), and in healthy control subjects.ResultsAsthmatic patients and patients with COPD had comparable expressions of CXCR1, CXCR2, and CD11b on peripheral blood and sputum neutrophils. Compared with control subjects, the peripheral neutrophil expression of CXCR2 was lower in patients with COPD (P = .03) and that of CD11b was higher in asthmatic patients and patients with COPD (P < .02 and P < .002). The expression of the CXCL8/IL-8 receptors on sputum neutrophils was markedly lower than on peripheral blood neutrophils (P < .0001). The downmodulation of CXCL8/IL-8 receptors was also present in healthy control subjects but less than that seen in asthmatic patients. The difference between peripheral blood and sputum expression of CXCL8/IL-8 receptors correlated with serum CXCL8/IL-8 levels. In asthmatic patients the expression of CXCR1 and CXCR2 on sputum neutrophils negatively correlated with sputum neutrophils.ConclusionIn neutrophilic asthma the expression of CXCL8/IL-8 receptors on peripheral and sputum neutrophils is similar to COPD and negatively correlated with the inflammatory infiltrate in the airways. The downmodulation of CXCL8/IL-8 receptors detected in the airways should be taken into account for an eventual therapeutic inhibition of these receptors. CXCL8/IL-8 is the most significant chemokine for neutrophils, and CXC chemokine receptor (CXCR) 1 and 2 are its 2 receptors, which are downmodulated by CXCL8/IL-8 and endotoxin on activated neutrophils. We sought to evaluate the expression of the CXCL8/IL-8 receptors and the activation marker CD11b on neutrophils in peripheral blood and in the site of airway inflammation. The flow cytometric expression of CXCR1, CXCR2, and CD11b was evaluated on peripheral blood and induced sputum neutrophils in patients with nonsevere asthma with greater than 60% sputum neutrophils, in patients with chronic obstructive pulmonary disease (COPD), and in healthy control subjects. Asthmatic patients and patients with COPD had comparable expressions of CXCR1, CXCR2, and CD11b on peripheral blood and sputum neutrophils. Compared with control subjects, the peripheral neutrophil expression of CXCR2 was lower in patients with COPD (P = .03) and that of CD11b was higher in asthmatic patients and patients with COPD (P < .02 and P < .002). The expression of the CXCL8/IL-8 receptors on sputum neutrophils was markedly lower than on peripheral blood neutrophils (P < .0001). The downmodulation of CXCL8/IL-8 receptors was also present in healthy control subjects but less than that seen in asthmatic patients. The difference between peripheral blood and sputum expression of CXCL8/IL-8 receptors correlated with serum CXCL8/IL-8 levels. In asthmatic patients the expression of CXCR1 and CXCR2 on sputum neutrophils negatively correlated with sputum neutrophils. In neutrophilic asthma the expression of CXCL8/IL-8 receptors on peripheral and sputum neutrophils is similar to COPD and negatively correlated with the inflammatory infiltrate in the airways. The downmodulation of CXCL8/IL-8 receptors detected in the airways should be taken into account for an eventual therapeutic inhibition of these receptors." @default.
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• W2087975003 date "2005-01-01" @default.
• W2087975003 modified "2023-10-11" @default.
• W2087975003 title "Downmodulation of CXCL8/IL-8 receptors on neutrophils after recruitment in the airways" @default.
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• W2087975003 doi "https://doi.org/10.1016/j.jaci.2004.08.048" @default.
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