{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,10,27]],"date-time":"2026-10-27T16:59:52Z","timestamp":1793120392824,"version":"4.5.0"},"posted":{"date-parts":[[2024,10,7]]},"group-title":"Microbiology","reference-count":89,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2024,10,7]],"date-time":"2024-10-07T00:00:00Z","timestamp":1728259200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2024,10,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>\n                  Investigation of chronic cystic fibrosis (CF) lung infections has been limited by a lack of murine models that reproduce obstructive lung pathology, chronicity of bacterial infections, and complex inflammation in human CF lung pathology. Three different approaches have been used separately to address these limitations, including using transgenic\n                  <jats:italic>Scnn1b-Tg<\/jats:italic>\n                  mice overexpressing a lung epithelial sodium channel to mimic the mucus-rich and hyperinflammatory CF lung environment, using synthetic CF sputum medium (SCFM) in an acute infection to induce bacterial phenotypes consistent with human CF, or using agar beads to promote chronic infections. Here, we combine these three models to establish a chronic\n                  <jats:italic>Pseudomonas aeruginosa<\/jats:italic>\n                  lung infection model using SCFM agar beads and\n                  <jats:italic>Scnn1b-<\/jats:italic>\n                  Tg mice (SCFM-Tg-mice) to recapitulate nutrients, mucus, and inflammation characteristic of the human CF lung environment. Like people with CF, SCFM-Tg-mice failed to clear bacterial infections. Lung function measurements showed that infected SCFM-Tg-mice had decreased inspiratory capacity and compliance, elevated airway resistance, and significantly reduced FVC and FEV0.1. Using spectral flow cytometry and multiplex cytokine arrays we show that, like people with CF, SCFM-Tg-mice developed inflammation characterized by eosinophil infiltration and Th2 lymphocytic cytokine responses. Chronically infected SCFM-Tg-mice developed an exacerbated mix of innate and Th1, Th2, and Th17-mediated inflammation, causing higher lung cellular damage, and elevated numbers of unusual Siglec F\n                  <jats:sup>+<\/jats:sup>\n                  neutrophils. Thus, SCFM-Tg-mice represents a powerful tool to investigate bacterial pathogenesis and potential treatments for chronic CF lung infections and reveal a potential role for Siglec F\n                  <jats:sup>+<\/jats:sup>\n                  neutrophils in CF inflammation.\n                <\/jats:p>\n                <jats:sec>\n                  <jats:title>Importance<\/jats:title>\n                  <jats:p>\n                    Host-pathogen interaction studies of\n                    <jats:italic>Pseudomonas aeruginosa<\/jats:italic>\n                    cystic fibrosis (CF) lung infections have been hampered by limitations of mouse infection models. Here we combine synthetic CF sputum medium (SCFM) agar beads and\n                    <jats:italic>Scnn1b<\/jats:italic>\n                    -Tg transgenic mice to model the mucus obstructed airways and complex inflammatory characteristic of the human cystic fibrosis lung environment. In this model, which we name SCFM-Tg-mice, we use SCFM to cause changes in bacterial gene expression consistent with sputum collected from people with CF and the\n                    <jats:italic>Scnn1b-Tg<\/jats:italic>\n                    mice produce excessive airway mucus like people with CF. We show that SCMF-Tg-mice infected with\n                    <jats:italic>P. aeruginosa<\/jats:italic>\n                    have defects in lung function and increased inflammation that is consistent with human CF lung infections. This model can be adapted for other bacterial species and can be used to test hypotheses about bacterial pathogenesis and potential treatments in a CF human-like system.\n                  <\/jats:p>\n                <\/jats:sec>","DOI":"10.1101\/2024.10.07.617039","type":"posted-content","created":{"date-parts":[[2024,10,8]],"date-time":"2024-10-08T00:15:25Z","timestamp":1728346525000},"source":"Crossref","is-referenced-by-count":2,"title":["A chronic\n                  <i>Pseudomonas aeruginosa<\/i>\n                  mouse lung infection modeling the pathophysiology and inflammation of human cystic fibrosis"],"prefix":"10.64898","author":[{"given":"Mylene","family":"Vaillancourt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diane","family":"Aguilar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sheryl 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