Resistin is elevated in cystic fibrosis sputum and correlates negatively with lung function |
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Authors: | Osric A Forrest Daniel M Chopyk Yael Gernez Milton R Brown Carol K Conrad Richard B Moss Vin Tangpricha Limin Peng Rabindra Tirouvanziam |
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Affiliation: | 1. Department of Pediatrics, Emory University, Atlanta, GA, USA;2. Center for CF & Airways Disease Research, Children''s Healthcare of Atlanta, Atlanta, GA, USA;3. Department of Medicine, Emory University, Atlanta, GA, USA;4. Department of Pediatrics, Stanford University, Stanford, CA, USA;5. Atlanta VA Medical Center, Decatur, GA, USA;6. Department of Biostatistics and Bioinformatics, Emory University, Atlanta, GA, USA. |
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Abstract: | BackgroundResistin is an immunometabolic mediator that is elevated in several inflammatory disorders. A ligand for Toll-like receptor 4, resistin modulates the recruitment and activation of myeloid cells, notably neutrophils. Neutrophils are major drivers of cystic fibrosis (CF) lung disease, in part due to the release of human neutrophil elastase- and myeloperoxidase-rich primary granules, leading to tissue damage. Here we assessed the relationship of resistin to CF lung disease.MethodsResistin levels were measured in plasma and sputum from three retrospective CF cohorts spanning a wide range of disease. We also assessed the ability of neutrophils to secrete resistin upon activation in vitro. Finally, we constructed a multivariate model assessing the relationship between resistin levels and lung function.ResultsPlasma resistin levels were only marginally higher in CF than in healthy control subjects. By contrast, sputum resistin levels were very high in CF, reaching 50–100 fold higher levels than in plasma. Among CF patients, higher plasma resistin levels were associated with allergic bronchopulmonary aspergillosis, and higher sputum resistin levels were associated with CF-related diabetes. Mechanistically, in vitro release of neutrophil primary granules was concomitant with resistin secretion. Overall, sputum resistin levels were negatively correlated with CF lung function, independently of other variables (age, sex, and genotype).ConclusionsOur data establish relationships between resistin levels in the plasma and sputum of CF patients that correlate with disease status, and identify resistin as a novel mechanistic link between neutrophilic inflammation and lung disease in CF. |
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Keywords: | Biomarker Inflammation Neutrophils Plasma Sputum CF Cystic Fibrosis CF-ABPA Cystic fibrosis with allergic bronchopulmonary aspergillosis CF-AC HC healthy control FEV1 forced expiratory volume in one second fMLF formyl-methionine leucine phenylalanine LB latrunculin B LPS lipopolysaccharide HNE human neutrophil elastase NFkB nuclear factor kappa-light-chain-enhancer of activated B cells PMN polymorphonuclear neutrophils TLR4 toll-like receptor 4 |
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