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• W2196116941 abstract "Smoking-induced COPD is characterized by chronic airway inflammation, which becomes enhanced by bacterial infections resulting in accelerated disease progression called exacerbation. Alveolar macrophages (AM) release endothelin-1 (ET-1), IL-6, CCL-2 and MMP-9, all of which are linked to COPD pathogenesis and exacerbation. ET-1 signals via ETA- and ETB-receptors (ETAR, ETBR). This is blocked by endothelin receptor antagonists (ERAs), like bosentan, which targets both receptors, ETAR-selective ambrisentan and ETBR-specific BQ788. Therefore, ERAs could have anti-inflammatory potential, which might be useful in COPD and other inflammatory lung diseases. We hypothesized that ERAs suppress cytokine release from AM of smokers and COPD subjects induced by lipopolysaccharide (LPS), the most important immunogen of gram-negative bacteria. AM were isolated from the broncho-alveolar lavage (BAL) of n=29 subjects (11 non-smokers, 10 current smokers without COPD, 8 smokers with COPD), cultivated and stimulated with LPS in the presence or absence of ERAs. Cytokines were measured by ELISA. Endothelin receptor expression was investigated by RT-PCR and western blot. AM expressed ETAR and ETBR mRNA, but only ETBR protein was detected. LPS and ET-1 both induced IL-6, CCL-2 and MMP-9. LPS-induced IL-6 release was increased in COPD versus non-smokers and smokers. Bosentan, ambrisentan and BQ788 all partially reduced all cytokines without differences between cohorts. Specific ETBR inhibition was most effective. LPS induced ET-1, which was exclusively blocked by BQ788. In conclusion, LPS induces ET-1 release in AM, which in turn leads to CCL-2, IL-6 and MMP-9 expression rendering AM sensitive for ERAs. ERAs could have anti-inflammatory potential in smoking-induced COPD." @default.
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• W2196116941 date "2015-12-01" @default.
• W2196116941 modified "2023-10-16" @default.
• W2196116941 title "Endothelin receptor-antagonists suppress lipopolysaccharide-induced cytokine release from alveolar macrophages of non-smokers, smokers and COPD subjects" @default.
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• W2196116941 doi "https://doi.org/10.1016/j.ejphar.2015.10.040" @default.
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