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Different immunological characteristics have been suggested to explain this variation, and we hypothesised that lung capacity may be associated with the innate immune response in pwCF. In an exploratory study, we aimed to investigate potential links between the innate immune response and lung function in pwCF using the standardised immune function assay TruCulture.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In a single-centre study with combined cross-sectional and longitudinal data before and after intravenous antibiotics, blood was sampled from<jats:italic>Pseudomonas aeruginosa<\/jats:italic>-infected pwCF. Whole blood was analysed by TruCulture to reveal the unstimulated and stimulated cytokine release. Tobit regressions and Spearman's correlations were used to estimate the associations between lung function and cytokine release.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We included 52 pwCF in the cross-sectional study and 24 in the longitudinal study. In the cross-sectional study, we found that compared to a healthy population, the release of toll-like receptor (TLR)3, TLR4- and TLR7\/8-stimulated interferon-\u03b3, and interleukin (IL)-12p40 was reduced. Although TLR3-stimulated IL-1\u03b2 and IL-6 release increased with lung function, overall, cytokine release did not correlate well with lung function. In the longitudinal study, the cytokine release was modified by antibiotic treatment, but the cytokine release before antibiotic treatment did not associate with changes in lung function after treatment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The stimulated cytokine release could not predict lung function levels or changes in pwCF, but our data indicate that pwCF experience exhaustion in the innate immune response after years of chronic bacterial infection.<\/jats:p><\/jats:sec>","DOI":"10.1183\/23120541.00256-2024","type":"journal-article","created":{"date-parts":[[2024,4,25]],"date-time":"2024-04-25T16:00:40Z","timestamp":1714060840000},"page":"00256-2024","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Clinical implications of innate immune exhaustion in cystic fibrosis"],"prefix":"10.1183","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1948-0799","authenticated-orcid":false,"given":"Rikke","family":"M\u00f8ller","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0622-5262","authenticated-orcid":false,"given":"Bibi","family":"Uhre Nielsen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2042-608X","authenticated-orcid":false,"given":"Elio","family":"Rossi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mads","family":"Lausen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marianne","family":"Skov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tacjana","family":"Pressler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sisse Rye","family":"Ostrowski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0268-3717","authenticated-orcid":false,"given":"Helle Krogh","family":"Johansen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"81","published-online":{"date-parts":[[2024,4,25]]},"reference":[{"key":"2024101712244853000_10.4.00256-2024.1","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1016\/j.jcf.2018.02.006","article-title":"ECFS best practice guidelines: the 2018 revision","volume":"17","author":"Castellani","year":"2018","journal-title":"J Cyst Fibros"},{"key":"2024101712244853000_10.4.00256-2024.2","doi-asserted-by":"publisher","DOI":"10.1111\/apa.15155"},{"key":"2024101712244853000_10.4.00256-2024.3","unstructured":"Charman S , McClenaghan E , Cosgriff R , et al. 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