Stratum corneum lipid matrix (SCLM) (SCLM)

The stratum corneum (SC) lipid matrix is the primary physical barrier of the skin, composed of ceramides, cholesterol, and free fatty acids organized into highly ordered lamellar bilayers [1]. This extracellular matrix fills the spaces between corneocytes, creating a brick and mortar structure that is essential for preventing excessive transepidermal water loss (TEWL) and maintaining cutaneous hydration [2]. Beyond hydration, the lipid matrix serves as a critical defense against environmental insults, including chemical irritants, allergens, and microbial pathogens [3]. In diseases such as atopic dermatitis and psoriasis, the composition and organization of these lipids are significantly altered, leading to a compromised barrier and increased susceptibility to inflammation [4]. Therapeutic strategies targeting this structure include the application of barrier-repair emollients containing physiological lipids to restore the lamellar organization and occlusive agents to provide temporary protection [5]. Sources: [1] StatPearls: Physiology, Skin Barrier (https://www.ncbi.nlm.nih.gov/books/NBK537164/); [2] Journal of Investigative Dermatology: The Stratum Corneum Lipid Barrier (https://doi.org/10.1038/jid.2012.174); [3] International Journal of Molecular Sciences: Skin Barrier Function (https://doi.org/10.3390/ijms19010018); [4] American Journal of Clinical Dermatology: Role of the Skin Barrier in Atopic Dermatitis (https://doi.org/10.1007/s40257-017-0301-1); [5] Journal of Clinical and Aesthetic Dermatology: Skin Barrier and Emollients (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4473358/).

Other names

Skin barrierEpidermal permeability barrierIntercellular lipid matrixCorneocyte lipid envelope

Physical restoration of the epidermal permeability barrier and reduction of transepidermal water loss through the replenishment of intercellular lipids or the creation of an occlusive film.