Olfactory cleft mucus proteome in chronic rhinosinusitis: a case-control pilot study.

Area of Science:

• Otorhinolaryngology
• Proteomics
• Biochemistry

Background:

• Mechanisms of smell loss in chronic rhinosinusitis (CRS) are multifactorial and not fully understood.
• The role of olfactory cleft (OC) mucus proteins, including odorant binding and metabolizing enzymes, in smell loss has been understudied.

Purpose of the Study:

• To investigate the protein composition of OC mucus in patients with CRS compared to controls.
• To identify differences in protein abundance, particularly odorant binding proteins and metabolizing enzymes, associated with smell dysfunction in CRS.

Main Methods:

• OC mucus was collected from patients with CRS (n=20) and controls (n=10).
• Proteomic analysis using liquid chromatography and mass spectrometry identified and quantified proteins.
• Bioinformatic analysis, including hierarchical clustering, was performed on differentially abundant proteins.

Main Results:

• A total of 2514 proteins were identified in OC mucus.
• Significant differences in protein abundance were observed between CRS patients and controls, with distinct protein profiles in CRS subtypes (CRSsNP and CRSwNP).
• 183 proteins showed significant differences between patients with normosmia and dysosmia, including odorant binding proteins and metabolizing enzymes.

Conclusions:

• The olfactory mucus proteome in CRS is rich in proteins involved in odorant transport and metabolism.
• Significant proteomic differences exist between CRS subtypes, controls, and individuals with varying olfactory function.
• Further research is warranted to elucidate the specific roles of these proteins in odorant processing and CRS-related smell loss.