Stratum corneum and cell membrane lipids

The lipid components of the stratum corneum and cell membranes are essential structural and functional elements that maintain biological compartmentalization and barrier integrity. In the stratum corneum, the outermost layer of the epidermis, these lipids—primarily ceramides, cholesterol, and free fatty acids—form a complex extracellular matrix organized into lamellar sheets (van Smeden et al., 2014, PubMed). This matrix is critical for the skin's permeability barrier, preventing excessive transepidermal water loss (TEWL) and protecting against environmental pathogens and allergens (StatPearls, Physiology, Skin). Cell membranes, composed of a phospholipid bilayer interspersed with sterols, regulate molecular transport and facilitate signal transduction (Wikipedia, Cell membrane). These lipids are therapeutic targets in dermatology, where topical barrier repair therapies are used to treat conditions like atopic dermatitis and psoriasis (NIH, Atopic Dermatitis). Furthermore, certain antimicrobial agents, such as Amphotericin B and Daptomycin, achieve therapeutic effects by targeting and disrupting the specific lipid compositions of fungal or bacterial membranes (PubChem). Understanding these lipid structures is also vital for the design of chemical permeation enhancers used in transdermal drug delivery systems.

Other names

Skin barrier lipidsEpidermal lipidsMembrane phospholipidsIntercellular lipidsCutaneous lipids

Drugs targeting these lipids typically act through barrier restoration, physical occlusion, or membrane disruption. Topical emollients and barrier repair creams replenish depleted lipids like ceramides to restore the skin's natural barrier function. Conversely, certain antibiotics and antifungals bind to specific lipid components (e.g., ergosterol) to create pores or disrupt the structural integrity of the cell membrane, leading to cell lysis.