Increased IL-1α expression in chronic rhinosinusitis with nasal polyps

Area of Science:

• Immunology
• Otorhinolaryngology
• Molecular Biology

Background:

• Chronic rhinosinusitis with nasal polyps (CRSwNP) is a complex inflammatory condition.
• The precise role of specific cytokines, such as interleukin-1 alpha (IL-1α), in CRSwNP pathogenesis requires further elucidation.

Purpose of the Study:

• To investigate the involvement and function of IL-1α in CRSwNP.
• To determine the relationship between IL-1α expression and inflammatory markers in nasal polyp tissues.

Main Methods:

• Quantitative analysis of IL-1α and other cytokine expression (IL-1β, IL-8, IL-13) using qPCR, Luminex, immunohistochemistry (IHC), and immunofluorescence (IF).
• Assessment of neutrophil and eosinophil infiltration in sinonasal tissues.
• In vitro studies using cultured nasal epithelial cells (NECs) to evaluate IL-1α regulation and its effects on cytokine production.

Main Results:

• Significantly higher mRNA and protein levels of IL-1α were observed in nasal polyp tissues compared to controls.
• IL-1α expression in polyps correlated with increased levels of IL-8, IL-1β, IL-6, IL-4, IL-13, and neutrophil infiltration.
• Stimulation of NECs with various pathogen-associated molecular patterns and cytokines upregulated IL-1α expression, while recombinant IL-1α promoted IL-8 and CXCL1 production.

Conclusions:

• IL-1α is significantly upregulated in nasal polyps and may play a role in promoting neutrophilia in CRSwNP.
• These findings suggest IL-1α as a potential therapeutic target for CRSwNP.