Characterisation of the Nasal Microbiome in Patients With N-ERD

Aspirin Exacerbated Respiratory Disease, Chronic Rhinitis

aerd, microbiome

Chronic rhinosinusitis (CRS) with (w) and without (s) nasal polyps (NP) in its different shapes is currently affecting up to 16% of the total population of the United States and around 11% of the population in Europe. It may also be associated with a hypersensitivity to non-steroidal anti-inflammatory (NSAID) drugs in a syndrome called NSAID-exacerbated respiratory disease (N-ERD) characterized by highly recurrent polyps and concomitant asthma. The pathophysiological mechanisms especially with regards to the potential role of the microbiome in driving N-ERD are so far not fully understood. Here, the investigators plan to analyse the nasal microbiome in these patients and to compare it to nasal samples from CRSwNP and CRSsNP patients as well as healthy controls (in total 80 subjects). This will provide insights into potential differences in the microbiome as compared to other CRS patients and the impact of the microbiome in driving this disease.

Chronic rhinosinusitis (CRS) with (w) and without (s) nasal polyps (NP) in its different shapes is currently affecting up to 16% of the total population of the United States and around 11% of the population in Europe . However CRS may also be associated with hypersensitivity to aspirin and other non-selective cyclooxygenase inhibitors. This syndrome of combined CRSwNP, asthma and intolerance to inhibitors of the cyclooxygenase-1 enzyme was termed Samter's triad, aspirin-exacerbated respiratory disease (AERD) and recently NSAID-exacerbated respiratory disease (N-ERD). N-ERD is thought to affect around 16% of patients suffering from CRSwNP , around 7% of adult asthmatic patients and 0.3-2.5% of the general population. One characteristic feature of this disease is the presence of nasal polyps that frequently relapse after surgery rendering this disease difficult to manage. Despite its relatively high prevalence, the pathophysiologic mechanisms are yet not fully understood. In this respect, an overproduction of and overresponsiveness to cysteinyl leukotrienes accompanied by and underproduction of and underresponsiveness to prostaglandins was observed in N-ERD patients.This indicates a dysregulation of pro and anti-inflammatory pathways. Our mucosal body surfaces are colonized by a large variety of microbes organized within complex community structures. Novel sequencing techniques (e.g. 16SrRNA sequencing) have facilitated in-depth analysis of the nasal microbiome in health and disease. Recent studies show amongst other an enrichment in Haemophilus and Streptococcus in the nose of CRS patients, whereas nasal microbiome of healthy patients is rich in Propionibacterium acnes . So far, differences in microbiome were observed in healthy versus CRS patients, but the impact of the microbial environment in N-ERD has not been assessed yet and is thus aim of the study. The investigators will collect nasal microbiome and nasal secretions from patients suffering from N-ERD and will compare them to the microbiome of CRSwNP, CRSsNP and healthy controls (n=20 per group). Additionally, cytokines in nasal secretions, protein expression at mRNA levels in nasal mucosa, and serum of these patients and clinical parameters (e.g. total nasal polyp score, quality of life questionnaire, olfactory performance) will be determined.

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