The epidermal lipid barrier in microbiome-skin interaction

Area of Science:

• Dermatology and Microbiology
• Skin Barrier Function
• Epidermal Lipid Metabolism

Background:

• The skin's outermost layer, the stratum corneum, features a lipid matrix crucial for barrier function.
• This barrier repels external toxins while retaining essential solutes.
• Specific microbes inhabit the skin, utilizing epidermal lipids and resisting antimicrobial fatty acids.

Purpose of the Study:

• To investigate the interaction between skin microorganisms and the epidermal lipid barrier.
• To understand how microbial manipulation of the lipid barrier contributes to skin inflammation.
• To identify potential targets for preventing inflammatory skin disorders.

Main Methods:

• Analysis of the lamellar-membrane matrix composition and function.
• Characterization of microbial lipid metabolism on the skin surface.
• Investigation of microbe-associated molecular patterns (MAMPs) and their interaction with the skin barrier.
• Comparison of skin barrier integrity and microbiome composition in healthy individuals versus those with atopic dermatitis.

Main Results:

• The epidermal lipid barrier effectively retains lipophilic microbe-associated molecular pattern (MAMP) molecules.
• Skin barrier defects, observed in conditions like atopic dermatitis, compromise barrier integrity.
• Compromised barriers lead to altered skin microbiomes, often including Staphylococcus aureus, and increased MAMP/toxin penetration, promoting inflammation.

Conclusions:

• Understanding how microbes interact with and potentially manipulate the epidermal lipid barrier is critical.
• This knowledge can lead to novel strategies for preventing and managing inflammatory skin conditions.
• Targeting microbial manipulation of the skin barrier offers a promising therapeutic avenue.