Airway inflammation in chronic rhinosinusitis with nasal polyps and asthma: The united airways concept further supported

Research output: Contribution to journalArticle

Abstract

Background: It has been established that patients with chronic rhinosinusitis with nasal polyps (CRSwNP) often have co-existing asthma. Objective: We aimed to test two hypotheses: (i) upper and lower airway inflammation in CRSwNP is uniform in agreement with the united airways concept; and (ii) bronchial inflammation exists in all CRSwNP patients irrespective of clinical asthma status. Methods: We collected biopsies from nasal polyps, inferior turbinates and bronchi of 27 CRSwNP patients and 6 controls. All participants were evaluated for lower airway disease according to international guidelines. Inflammatory cytokines were investigated using a Th1/Th2 assay including 14 chemokines and cytokines; tissue concentrations were normalized according to tissue weight and total protein concentration. Individual cytokines and multivariate inflammatory profiles were compared between biopsy sites and between patients and controls. Results: We found significantly higher concentrations of Th2 cytokines in nasal polyps compared to inferior turbinate and bronchial biopsies. In addition, we showed that the inflammatory profile of nasal polyps and bronchial biopsies correlated significantly (p<0.01). From the Th2 cytokines measured, IL-13 was significantly increased in bronchial biopsies from CRSwNP patients with, but not without asthma. Conclusion: Our findings support the united airways concept; however, we did not find evidence for subclinical bronchial inflammation in CRSwNP patients without asthma. Finally, this study indicates for the first time that nasal polyps potentially play an important role in the airway inflammation rather than being a secondary phenomenon.

Details

Authors
  • Kåre Håkansson
  • Claus Bachert
  • Lars Konge
  • Simon Francis Thomsen
  • Anders Elm Pedersen
  • Steen Seier Poulsen
  • Tomas Martin-Bertelsen
  • Ole Winther
  • Vibeke Backer
  • Christian Von Buchwald
External organisations
  • University of Copenhagen
  • Ghent University Hospital
  • Karolinska Institutet
  • Technical University of Denmark
  • Biotech Research and Innovation Centre
Original languageEnglish
Article numbere0127228
JournalPLoS ONE
Volume10
Issue number7
Publication statusPublished - 2015 Jul 1
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes