Stratum corneum intercellular lipid matrix

The stratum corneum intercellular lipid matrix is the extracellular lipid-rich component of the outermost layer of the skin (stratum corneum), which fills the intercellular spaces between corneocytes (the "bricks" in the skin's barrier structure)[1][2][3][4]. This lipid matrix is a highly organized, multilamellar structure mainly composed of ceramides, cholesterol, and free fatty acids in approximately equal proportions. Its primary biological function is to form the skin's permeability barrier, preventing excessive water loss and obstructing the entry of pathogens, chemicals, or allergens. The precise molecular arrangement and composition of this lipid matrix are critical for its barrier function; alterations are implicated in various skin diseases, such as atopic dermatitis or psoriasis, where barrier function is diminished[2][3][4]. While essential for skin health and targeted by emollient and barrier repair therapies, the matrix is not a molecular therapeutic target (such as a receptor or enzyme), but rather a composite lipid structure[1][2][4].

Other names

Stratum corneum lipid matrixSC lipid matrixStratum corneum extracellular lipid matrixIntercellular lipid matrix of stratum corneum