New insights into upper airway innate immunity

Area of Science:

• Immunology
• Otorhinolaryngology
• Microbiology

Background:

• The upper airway's immune system protects against microbial infections.
• Sinonasal epithelial cells detect pathogens using receptors like Toll-like receptors, bitter taste receptors, and sweet taste receptors.
• Receptor activation initiates innate immune responses, including mucociliary clearance and antimicrobial compound secretion.

Purpose of the Study:

• To review the role of innate immunity in the upper airway.
• To explore the mechanisms of sinonasal innate immunity.
• To discuss the clinical relevance of these immune functions.

Main Methods:

• A literature review was conducted on innate immunity in the human sinonasal cavity.

Main Results:

• Innate immune roles in the sinonasal cavity include the epithelial barrier, mucociliary clearance, and antimicrobial secretion.
• Dysfunction in these defenses is linked to chronic rhinosinusitis and cystic fibrosis.
• Bitter and sweet taste receptors significantly modulate upper airway immune responses.

Conclusions:

• Multiple innate immune mechanisms work together to maintain a pathogen-free sinonasal cavity.
• Understanding sinonasal innate immunity is crucial for managing respiratory conditions.
• Implications for treating chronic rhinosinusitis and cystic fibrosis are significant.