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04.07.2016 | Original Investigation | Ausgabe 5/2016

Medical Microbiology and Immunology 5/2016

Colonization of CF patients’ upper airways with S. aureus contributes more decisively to upper airway inflammation than P. aeruginosa

Zeitschrift:
Medical Microbiology and Immunology > Ausgabe 5/2016
Autoren:
Wibke Katharina Janhsen, Christin Arnold, Julia Hentschel, Thomas Lehmann, Wolfgang Pfister, Michael Baier, Klas Böer, Kerstin Hünniger, Oliver Kurzai, Uta-Christina Hipler, Jochen Georg Mainz
Wichtige Hinweise
Christin Arnold and Jochen Georg Mainz have contributed equally to this article.

Abstract

In cystic fibrosis (CF) patients’ airways, inflammatory processes decisively contribute to remodeling and pulmonary destruction. The aims of this study were to compare upper airway (UAW) inflammation in the context of Staphylococcus aureus and Pseudomonas aeruginosa colonization in a longitudinal setting, and to examine further factors influencing UAW inflammation. Therefore, we analyzed soluble inflammatory mediators in noninvasively obtained nasal lavage (NL) of CF patients together with microbiology, medication, and relevant clinical parameters. NL, applying 10 mL of isotonic saline per nostril, was serially performed in 74 CF patients (326 samples). Concentrations of the inflammatory mediators’ interleukin (IL)-1β, IL-6, IL-8, matrix metalloproteinase (MMP)-9, and its anti-protease TIMP-1 were quantified by bead-based multiplexed assay, neutrophil elastase (NE) via ELISA. Culture-based microbiology of the upper and lower airways (LAW), as well as serological and clinical findings, were compiled. Our results indicate that UAW colonization with S. aureus significantly impacts the concentration of all measured inflammatory mediators in NL fluid except TIMP-1, whereas these effects were not significant for P. aeruginosa. Patients with S. aureus colonization of both the UAW and LAW showed significantly increased concentrations of IL-1β, IL-6, IL-8, MMP-9, and slightly elevated concentrations of NE in NL fluid compared to non-colonized patients. This work elaborates a survey on S. aureus’ virulence factors that may contribute to this underestimated pathology. Serial assessment of epithelial lining fluid by NL reveals that colonization of the UAW with S. aureus contributes more to CF airway inflammatory processes than hitherto expected.

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Zusatzmaterial
The supplemental material contains further information about statistical data analysis (results of the univariate pre-analysis, overview about included variables for the linear mixed model calculation). Furthermore, the supplemental material includes additional information about inflammatory mediators such as NE, MMP-9, TIMP-1, IL-1β, IL-6, and IL-8 with focusing on interactions between the inflammatory mediators and possible changes in concentrations in the airways of cystic fibrosis patients compared to healthy people. In addition, the supplemental material contains further information about patients’ airway colonization status and estimated marginal means of inflammatory mediators in NLF with respect to the colonization status of the UAW and LAW with P. aeruginosa (PDF 409 kb)
430_2016_463_MOESM1_ESM.pdf
Literatur
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