New perspectives on epidermal barrier dysfunction in atopic dermatitis: gene-environment interactions

Area of Science:

• Dermatology
• Immunology
• Genetics

Background:

• Atopic dermatitis (AD) is a chronic inflammatory skin disease influenced by genetics and environmental factors.
• While genetic mutations are implicated, their role in AD manifestation is often insufficient without other contributing factors.

Purpose of the Study:

• To propose a new perspective on the significance of epidermal barrier dysfunction in genetically predisposed individuals with AD.
• To explore how environmental agents interact with a compromised skin barrier to worsen AD.

Main Methods:

• This is a review article, synthesizing existing research on atopic dermatitis pathogenesis.
• Focuses on the role of epidermal barrier function, genetic predisposition, and environmental interactions.

Main Results:

• Genetic predisposition can lead to increased stratum corneum chymotryptic enzyme, prematurely breaking down corneodesmosomes and impairing the skin barrier.
• Environmental factors like soaps, detergents, topical corticosteroids, and exogenous proteases from mites and Staphylococcus aureus further damage the epidermal barrier.
• A defective skin barrier increases allergen penetration, leading to inflammation and AD exacerbations.

Conclusions:

• Epidermal barrier dysfunction is a critical factor in the pathogenesis of atopic dermatitis, particularly in genetically susceptible individuals.
• The interplay between genetic predisposition and environmental triggers significantly contributes to the chronic inflammatory cycle of AD.