Stratum corneum extracellular lipid matrix (SC lipid matrix) (SC lipid matrix)

The stratum corneum extracellular lipid matrix is the primary physical and chemical barrier of the human skin, located in the outermost layer of the epidermis (Elias, 2005, PMID: 15930091). It consists of a highly organized mixture of ceramides, free fatty acids, and cholesterol arranged in lamellar structures that surround the corneocytes, often described by the 'bricks and mortar' model (Proksch et al., 2008, PMID: 18306158). This lipid matrix is essential for preventing excessive transepidermal water loss and protecting the body from environmental insults, including pathogens and allergens (van Smeden et al., 2014, PMID: 24553931). In various dermatological conditions such as atopic dermatitis and psoriasis, the composition and organization of these lipid domains are significantly altered, leading to barrier dysfunction and increased sensitivity (Bouwstra & Ponec, 2006, PMID: 16919013). Pharmacological intervention typically involves the topical application of physiological lipids to restore barrier integrity or the use of chemical enhancers to temporarily fluidize the matrix for improved drug delivery (Prausnitz & Langer, 2008, PMID: 18953337). Understanding the phase behavior and molecular packing of these lipids is crucial for developing effective dermatological treatments and transdermal drug delivery systems.

Other names

Stratum corneum lipid domainsIntercellular lipid lamellaeSkin lipid barrierExtracellular lipid matrix of the skin

Barrier restoration through lipid replenishment, occlusion to reduce water loss, and fluidization of lipid domains to enhance drug penetration.