Epithelial-Dermal Immune Memory: Tracking Staphylococcus aureus-Induced Trained Immunity in the Progression of...

Area of Science:

• Immunology
• Dermatology
• Microbiology

Background:

• Atopic dermatitis (AD) is linked to genetic factors and skin barrier defects.
• Acute bacterial infections like cellulitis involve deep dermal Staphylococcus aureus invasion and significant tissue damage.
• A bidirectional relationship exists between AD and bacterial infections, but molecular mechanisms are unclear.

Purpose of the Study:

• To explore trained immunity as a mechanistic link between acute infections and chronic skin inflammation.
• To investigate the role of epigenetic and metabolic reprogramming in this interaction.
• To discuss therapeutic strategies targeting these pathways.

Main Methods:

• Review of recent studies on trained immunity, innate immune memory, and skin inflammation.
• Analysis of molecular mechanisms involving bacterial virulence factors and pattern recognition receptor signaling.
• Discussion of epigenetic and metabolic reprogramming in immune cells.

Main Results:

• Trained immunity, driven by epigenetic and metabolic changes, mediates the interaction between bacterial infections and AD.
• Bacterial virulence factors and PRR signaling initiate persistent innate immune memory.
• Innate immune reprogramming creates a continuum from cellulitis to chronic inflammatory skin conditions like AD.

Conclusions:

• Trained immunity provides a mechanistic link between acute bacterial skin infections and chronic atopic dermatitis.
• Targeting epigenetic checkpoints and metabolic pathways offers novel therapeutic avenues for inflammatory skin disorders.