[Innate antimicrobial peptides in the skin]

Area of Science:

• Dermatology
• Immunology
• Microbiology

Background:

• Human skin maintains a natural resistance to infection despite constant environmental exposure and microflora presence.
• Physical mechanisms like desquamation and mucus secretion contribute to skin's defense.
• A significant component of this resistance is the 'chemical barrier' composed of antimicrobial peptides and proteins (AMPs).

Purpose of the Study:

• To investigate the role of antimicrobial peptides and proteins (AMPs) in the human skin's natural resistance to infection.
• To explore the stimuli that regulate AMP synthesis in skin.
• To evaluate the potential therapeutic implications of modulating the skin's chemical barrier.

Main Methods:

• Review of existing literature on skin's chemical barrier and AMPs.
• Analysis of AMP expression patterns in healthy skin, inflammatory lesions, and specific dermatoses.
• Correlation of AMP levels with infection rates in conditions like psoriasis and atopic dermatitis.

Main Results:

• AMPs, including human beta-defensins, RNase 7, psoriasin, and cathelicidin LL-37, are constitutively and inducibly produced by epithelial cells.
• AMP synthesis can be stimulated by both inflammatory and non-inflammatory mediators.
• Elevated AMP levels in psoriasis correlate with lower infection rates, while decreased AMPs in atopic dermatitis correlate with higher infection rates.

Conclusions:

• The chemical skin barrier, mediated by AMPs, plays a crucial role in preventing skin infections.
• Non-inflammatory stimulation of AMP synthesis represents a potential therapeutic strategy for enhancing skin immunity.
• Modulating the skin's natural antimicrobial defenses could offer a novel approach to managing and preventing skin infections.