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Disease-driven changes in early CF airway fluid metabolites may identify therapeutic targets to curb progression.<\/jats:p><jats:p>CF patients aged 12\u201338\u2005months (n=24; three out of 24 later denoted as CF screen positive, inconclusive diagnosis) received chest computed tomography scans, scored by the Perth\u2013Rotterdam Annotated Grid Morphometric Analysis for CF (PRAGMA-CF) method to quantify total lung disease (PRAGMA-%Dis) and components such as bronchiectasis (PRAGMA-%Bx). Small molecules in bronchoalveolar lavage fluid (BALF) were measured with high-resolution accurate-mass metabolomics. Myeloperoxidase (MPO) was quantified by ELISA and activity assays.<\/jats:p><jats:p>Increased PRAGMA-%Dis was driven by bronchiectasis and correlated with airway neutrophils. PRAGMA-%Dis correlated with 104 metabolomic features (p&lt;0.05, q&lt;0.25). The most significant annotated feature was methionine sulfoxide (MetO), a product of methionine oxidation by MPO-derived oxidants. We confirmed the identity of MetO in BALF and used reference calibration to confirm correlation with PRAGMA-%Dis (Spearman's \u03c1=0.582, p=0.0029), extending to bronchiectasis (PRAGMA-%Bx; \u03c1=0.698, p=1.5\u00d710<jats:sup>\u22124<\/jats:sup>), airway neutrophils (\u03c1=0.569, p=0.0046) and BALF MPO (\u03c1=0.803, p=3.9\u00d710<jats:sup>\u22126<\/jats:sup>).<\/jats:p><jats:p>BALF MetO associates with structural lung damage, airway neutrophils and MPO in early CF. Further studies are needed to establish whether methionine oxidation directly contributes to early CF lung disease and explore potential therapeutic targets indicated by these findings.<\/jats:p>","DOI":"10.1183\/13993003.01118-2018","type":"journal-article","created":{"date-parts":[[2018,9,6]],"date-time":"2018-09-06T12:07:20Z","timestamp":1536235640000},"page":"1801118","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":50,"title":["Myeloperoxidase oxidation of methionine associates with early cystic fibrosis lung disease"],"prefix":"10.1183","volume":"52","author":[{"given":"Joshua D.","family":"Chandler","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Camilla","family":"Margaroli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hamed","family":"Horati","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew\u00a0B.","family":"Kilgore","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mieke","family":"Veltman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. 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