Pathogenesis of chronic rhinosinusitis: inflammation.

Area of Science:

• Immunology
• Otolaryngology
• Pathophysiology

Background:

• Chronic rhinosinusitis (CRS) encompasses heterogeneous inflammatory conditions of the nasal and paranasal cavities, presenting with (CRSwNP) or without (CRSsNP) nasal polyps.
• These prevalent conditions significantly impair quality of life, reduce productivity, and incur substantial healthcare costs.
• The multifactorial etiology of CRS remains incompletely understood, despite ongoing research into its pathophysiology.

Purpose of the Study:

• To review recent evidence illuminating the inflammatory processes in CRS.
• To enhance understanding of the pathogenesis of this heterogeneous upper airway disease.
• To highlight the importance of characterizing specific CRS subgroups for diagnostics and personalized medicine.

Main Methods:

• Literature review of recent scientific evidence on CRS pathogenesis.
• Analysis of studies investigating histopathology, cellular patterns, and molecular alterations.
• Examination of research on microbial factors and epithelial barrier function.

Main Results:

• CRS exhibits a wide array of alterations, including histopathological changes, distinct inflammatory and T-cell patterns, and remodeling parameters like TGF-β.
• Alterations in eicosanoid and IgE production, microbial presence, and epithelial barrier dysfunction are implicated in CRS pathogenesis.
• Significant heterogeneity exists within the CRSwNP subgroup, influencing the risk of comorbid asthma.

Conclusions:

• Characterizing specific CRS disease subgroups is a critical scientific and clinical challenge.
• Accurate subgroup identification is essential for developing effective diagnostic tools and individualized treatment strategies.
• Further research into the inflammatory pathways of CRS is vital for unraveling its complex pathogenesis.