{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T23:58:54Z","timestamp":1777507134965,"version":"3.51.4"},"reference-count":47,"publisher":"European Respiratory Society (ERS)","issue":"4","license":[{"start":{"date-parts":[[2024,3,28]],"date-time":"2024-03-28T00:00:00Z","timestamp":1711584000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["82270021"],"award-info":[{"award-number":["82270021"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["publications.ersnet.org"],"crossmark-restriction":true},"short-container-title":["ERJ Open Res"],"accepted":{"date-parts":[[2024,3,16]]},"published-print":{"date-parts":[[2024,7]]},"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Sputum nitrate\/nitrite, which is the main component of reactive nitrogen species, is a potential biomarker of disease severity and progression in bronchiectasis. This study aimed to determine the association between nitrate\/nitrite and exacerbations and airway microbiota in bronchiectasis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We measured total nitrate\/nitrite concentration in sputum samples collected from 85 patients with stable bronchiectasis, performed 16S ribosomal RNA sequencing of sputum samples and predicted the denitrification ability of airway microbiota using Phylogenetic Investigation of Communities by Reconstruction of Unobserved States (PICRUSt). Relationships between sputum total nitrate\/nitrite and disease severity, exacerbations and airway microbiota were examined.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Higher total sputum nitrate\/nitrite was associated with more severe bronchiectasis defined by E-FACED (exacerbation, forced expiratory volume in 1\u2005s, age, chronic colonisation by<jats:italic>Pseudomonas aeruginosa<\/jats:italic>, radiological extension and dyspnoea) (p=0.003) or Bronchiectasis Severity Index (p=0.006) and more exacerbations in the prior 12\u2005months (p=0.005). Moreover, total sputum nitrate\/nitrite was significantly higher in patients with worse cough score (p=0.03), worse sputum purulence score (p=0.01) and worse Medical Research Council dyspnoea score (p=0.02). In addition, the total sputum nitrate\/nitrite of the<jats:italic>P. aeruginosa<\/jats:italic>colonised (PA) group was higher than that of the non-<jats:italic>P. aeruginosa<\/jats:italic>colonised (NPA) group (p=0.04), and the relative abundance of<jats:italic>P. aeruginosa<\/jats:italic>was positively correlated with total nitrate\/nitrite (r=0.337, p=0.002). Denitrification module (M00529) was also significantly enriched in the PA group compared to the NPA group through PICRUSt analyses. Using receiver-operating characteristic analysis, total nitrate\/nitrite was associated with exacerbations during 1-year follow-up (area under the curve 0.741, p=0.014).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Sputum nitrate\/nitrite is a biomarker of disease severity and associated with<jats:italic>P. aeruginosa<\/jats:italic>colonisation in bronchiectasis.<\/jats:p><\/jats:sec>","DOI":"10.1183\/23120541.01045-2023","type":"journal-article","created":{"date-parts":[[2024,3,28]],"date-time":"2024-03-28T17:16:49Z","timestamp":1711646209000},"page":"01045-2023","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Total sputum nitrate\/nitrite is associated with exacerbations and<i>Pseudomonas aeruginosa<\/i>colonisation in 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