Aeroallergens in Atopic Dermatitis and Chronic Urticaria

Area of Science:

• Dermatology
• Immunology
• Allergology

Background:

• Aeroallergens are known triggers for respiratory allergic diseases.
• Their role in allergic skin conditions like atopic dermatitis (AD) and chronic urticaria (CU) is less understood.

Purpose of the Study:

• To review the molecular mechanisms of aeroallergen-induced skin disease in AD and CU.
• To discuss current and emerging management strategies for these conditions.

Main Methods:

• Review of scientific literature on aeroallergen triggers in AD and CU.
• Analysis of molecular pathways involved in skin barrier function, innate immunity, and neuroimmune signaling.
• Evaluation of therapeutic strategies, including biologics and checkpoint inhibitors.

Main Results:

• Aeroallergen exposure triggers skin disease via epithelial barrier disruption (PAR-2, TLR signaling) and innate immune activation, leading to IL-31-driven itch-scratch cycles.
• House dust mite sensitization is linked to increased basophil reactivity and severity in CU.
• Inflammation involves overlapping barrier dysfunction, innate immunity, and neuroimmune pathways beyond IgE.
• Biologics and checkpoint inhibitors show potential for managing aeroallergen-driven skin inflammation.

Conclusions:

• Aeroallergen exposure significantly contributes to the pathogenesis of AD and CU through complex molecular pathways.
• Targeting epithelial barrier, innate immunity, and neuroimmune signaling offers promising therapeutic avenues.
• Future research should focus on patient stratification by endotype and quantifying aeroallergen impact on disease progression.