Abstract
Chronic polymicrobial lung infections in adult cystic fibrosis patients are typically dominated by high levels of Pseudomonas aeruginosa. Determining the impact of P. aeruginosa growth on airway secretion composition is fundamental to understanding both the behaviour of this pathogen in vivo, and its relationship with other potential colonising species. We hypothesised that the marked differences in the phenotypes of clinical isolates would be reflected in the metabolite composition of spent culture media. 1H NMR spectroscopy was used to characterise the impact of P. aeruginosa growth on a synthetic medium as part of an in vitro CF lower airways model system. Comparisons of 15 CF clinical isolates were made and four distinct metabolomic clusters identified. Highly significant relationships between P. aeruginosa isolate cluster membership and both patient lung function (FEV1) and spent culture pH were identified. This link between clinical isolate growth behaviour and FEV1 indicates characterisation of P. aeruginosa growth may find application in predicting patient lung function while the significant divergence in metabolite production and consumption observed between CF clinical isolates suggests dominant isolate characteristics have the potential to play both a selective role in microbiota composition and influence pseudomonal behaviour in vivo.
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This study was supported by the Anna Trust. JK is supported by a BBSRC Industrial CASE studentship.
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Kozlowska, J., Rivett, D.W., Vermeer, L.S. et al. A relationship between Pseudomonal growth behaviour and cystic fibrosis patient lung function identified in a metabolomic investigation. Metabolomics 9, 1262–1273 (2013). https://doi.org/10.1007/s11306-013-0538-5
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DOI: https://doi.org/10.1007/s11306-013-0538-5