Stratum corneum physicochemical components

The stratum corneum (SC) is the outermost layer of the skin, acting as a critical physicochemical barrier that regulates water content and protects against environmental insults. It is structurally organized into corneocytes surrounded by a lipid-rich extracellular matrix, a configuration essential for preventing excessive transepidermal water loss (Source: StatPearls, Physiology, Stratum Corneum). The physicochemical components refer to the complex interplay between water, natural moisturizing factors (NMFs), and lipids that maintain skin hydration and elasticity (Source: PubMed, PMC2841915). In diseases such as atopic dermatitis and psoriasis, these components are often depleted or disorganized, leading to barrier dysfunction and inflammation (Source: Journal of Clinical and Aesthetic Dermatology). Therapeutic strategies do not target a single receptor but rather aim to restore this environment using humectants to attract water and occlusives to prevent its evaporation (Source: Clinical, Cosmetic and Investigational Dermatology). Consequently, while not a traditional molecular target, the maintenance of these physicochemical components is a cornerstone of dermatological therapy.

Other names

Skin barrierEpidermal barrierStratum corneum water-lipid matrixNatural moisturizing factor system

Topical agents interact with these components via occlusion (forming a physical barrier to prevent water loss), humectancy (binding water within the stratum corneum), or emolliency (filling gaps between corneocytes with lipids to restore barrier integrity).