Allergic Sensitization to Inhalant Allergens in the Upper Respiratory Tract-the B Cell Side

Area of Science:

• Immunology
• Allergy Research
• Respiratory Medicine

Background:

• Allergic diseases are increasing globally, linked to impaired respiratory epithelial barriers.
• Inhalant allergens like pollen and dust mites trigger IgE-mediated responses, causing allergic rhinitis (AR) and asthma.
• B cells are central to allergic responses, producing allergen-specific IgE and driving disease pathogenesis.

Purpose of the Study:

• To explore the mechanisms of allergic sensitization at the respiratory mucosa.
• To highlight the role of B cells and epithelial cells in allergic disease.
• To discuss factors influencing allergen transport and immune activation.

Main Methods:

• Review of current literature on allergic disease mechanisms.
• Analysis of B cell roles in IgE production and immune responses.
• Examination of epithelial cell-innate immune responses to allergens.
• Discussion of allergen transport and immune cell activation pathways.

Main Results:

• Respiratory epithelial barrier dysfunction is a key driver of allergic sensitization.
• B cells, through IgE production and other functions, are critical in AR and asthma.
• Epithelial cells release alarmins, initiating type 2 inflammation.
• Allergens are transported to lymph nodes, activating T follicular helper cells and driving IgE responses.

Conclusions:

• Understanding B cell function and epithelial responses is crucial for targeting allergic diseases.
• Factors like the microbiome and environmental pollutants modulate allergic sensitization.
• Advanced models like lymphoid organoids show promise for studying allergic sensitization.