Skin water retention mechanisms

Skin water retention mechanisms comprise a network of molecular, cellular, and structural proteins, lipids, and transporters that together preserve water within the skin, particularly in the outermost layer, the stratum corneum. Principal components include natural moisturizing factors (NMFs—amino acids, urea, lactates), a lipid matrix composed of ceramides, cholesterol, and fatty acids, membrane proteins such as aquaporin-3 that facilitate water and glycerol movement, and structural proteins like filaggrin and keratins. The integrity and organization of these elements prevent excessive transepidermal water loss (TEWL), promote flexibility, and maintain an effective barrier against external insults. Impairment of these mechanisms is central to dermatological conditions such as atopic dermatitis and xerosis. Moisturizers and other topical agents may modulate these mechanisms to enhance skin hydration and barrier function. Skin water retention is an emergent property of the collective action of these molecular and structural systems; it is not attributable to a single druggable molecular target.

Other names

Skin hydration mechanismsSkin barrier water retention

Occlusive layer formation (barrier creams); Humectant action (glycerol, urea, hyaluronic acid increase water retention in the stratum corneum); Ceramide replenishment (improves intercellular lipid barrier); Enhancement of aquaporin-3 function (potential for future drugs)