[Functional consequences of cutaneous lipid perturbation]

Area of Science:

• Dermatology
• Biochemistry
• Skin Physiology

Context:

• Epidermal lipids are vital for skin barrier function, preventing transepidermal water loss and external penetration.
• Barrier integrity is influenced by the physicochemical properties of topical substances and quantified by transepidermal water loss.
• Abnormal epidermal lipid profiles are implicated in various skin conditions.

Purpose:

• To review the role of epidermal lipids in skin barrier function.
• To explore how alterations in lipid composition affect skin health and disease.
• To discuss the impact of factors like corticotherapy, ichthyosis, acne, and UV exposure on epidermal lipids.

Summary:

• Epidermal lipids are essential for the skin's barrier, limiting water loss and blocking external agents.
• Decreased ceramides and omega-6 fatty acids in atopic dermatitis impair barrier function, increasing water loss.
• Lipid profile modifications are observed in ichthyosis, acne, and in response to corticotherapy and UV radiation.

Impact:

• Understanding epidermal lipid dynamics is crucial for managing skin barrier disorders.
• This knowledge aids in developing targeted therapies for conditions like atopic dermatitis and ichthyosis.
• Insights into lipid metabolism inform strategies for skin protection and treatment, considering factors like UV exposure and topical applications.