Stratum corneum intercellular lipid barrier (SC lipid barrier)

The stratum corneum intercellular lipid barrier is a highly organized extracellular matrix located between corneocytes in the outermost layer of the skin, primarily composed of ceramides, cholesterol, and free fatty acids organized into lamellar bilayers [1]. This structure serves as the body's primary permeability barrier, essential for preventing excessive transepidermal water loss (TEWL) and maintaining internal hydration [2]. Beyond hydration, it acts as a shield against environmental insults, including pathogens, allergens, and chemical irritants [3]. In diseases like atopic dermatitis and psoriasis, alterations in lipid composition lead to barrier dysfunction, which facilitates inflammation and infection [4]. Therapeutic strategies targeting this barrier include the use of barrier repair formulations that replenish essential lipids and occlusive agents that provide a temporary physical seal [5]. Additionally, the barrier is a critical consideration in transdermal drug delivery, where it acts as the rate-limiting step for the absorption of systemic medications [6]. [1] Elias PM. Seminars in Immunopathology, 2007. [2] Proksch E, et al. Experimental Dermatology, 2008. [3] van Smeden J, et al. Progress in Lipid Research, 2014. [4] Nemoto-Hasebe I, et al. Journal of Investigative Dermatology, 2009. [5] Lynde CW. Skin Therapy Letter, 2001. [6] Prausnitz MR, Langer R. Nature Biotechnology, 2008.

Other names

Skin lipid barrierEpidermal lipid barrierIntercellular lipid lamellaeStratum corneum lipidsPermeability barrier

Restoration of lipid lamellar integrity, replenishment of physiological lipids (ceramides, cholesterol, fatty acids), and physical occlusion to prevent transepidermal water loss.