We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Gram-negative bacterial carriage in chronic rhinosinusitis with nasal polyposis is not associated with more severe inflammation.
- Authors
Tabet, Paul; Endam, Leandra Mfuna; Boisvert, Pierre; Boulet, Louis‐Philippe; Desrosiers, Martin
- Abstract
Background We have previously demonstrated that persistent symptoms following functional endoscopic sinus surgery for chronic rhinosinusitis (CRS) is associated with Gram-negative bacterial carriage. Mechanisms for this remain unknown. We wished to determine whether Gram-negative carriage in patients with CRS with nasal polyposis is associated with a more severe inflammatory phenomenon. Methods Three hundred and thirty-seven patients with CRS with nasal polyposis (CRSwNP) previously phenotyped for genetic association studies with questionnaire, serum biomarkers, and endoscopically-obtained swab cultures were studied. These were separated according to the presence (wGN) or absence (sGN) of Gram-negative bacterial carriage; demographic parameters and available serum biomarkers (complete blood count [CBC], total immunoglobulin E [IgE]) were then compared. Subgroup analysis for Pseudomonas aeruginosa (GNwPa) and non- Pseudomonas Gram-negative bacteria (GNsPs) was performed in order to explore potentially differential roles of these bacteria. Results Gram-negative bacterial carriage was not associated with a difference in demographic parameters or serum biomarkers. However, P. aeruginosa carriage was associated with a higher self-reported incidence of asthma (GNwPa 79%, sGN 57%; p = 0.048). Interestingly, serum IgE was increased in the non- Pseudomonas Gram-negative population (GNsPs: 338 IU/mL, sGN: 195 IU/mL; p = 0.026). Conclusion CRSwNP patients colonized with Gram-negative bacteria have a similar pattern of inflammation as assessed by serum biomarkers to those colonized with Gram-positive ones. Gram-negative bacteria may contribute to development of a T helper 2 (Th2) phenotype via other mechanisms, possibly via Toll-like receptor 4 (TLR4)-mediated interleukin 33 (IL-33) production. Differences in phenotype associated with Pseudomonas species carriage suggest a different behavior than other Gram-negative bacteria, supporting their importance as disease modifiers in CRSwNP.
- Subjects
SINUSITIS treatment; GRAM-negative bacteria; NASAL polyps; INFLAMMATION; IMMUNOGLOBULIN E; PSEUDOMONAS aeruginosa infections
- Publication
International Forum of Allergy & Rhinology, 2015, Vol 5, Issue 4, p289
- ISSN
2042-6976
- Publication type
Article
- DOI
10.1002/alr.21481