Keratinocyte intercellular adhesion structures and extracellular matrix components in the stratum corneum

The stratum corneum (SC) is the outermost layer of the epidermis, serving as the body's primary interface with the environment and its most critical physical barrier (StatPearls, 2023). This target refers to the complex structural assembly consisting of corneodesmosomes—specialized intercellular junctions that provide mechanical cohesion between corneocytes—and the extracellular lipid matrix that fills the interstitial spaces (Journal of Investigative Dermatology, 2011). The lipid matrix is primarily composed of ceramides, cholesterol, and free fatty acids, which are organized into lamellar structures essential for preventing transepidermal water loss and blocking the entry of pathogens (Dermato-Endocrinology, 2011). In various skin disorders, such as psoriasis, atopic dermatitis, and ichthyosis, the balance of these components is disrupted, leading to barrier dysfunction, inflammation, and abnormal desquamation (PubMed, PMID: 16910014). Pharmacological agents target these structures to either promote the shedding of dead skin cells through the degradation of adhesion proteins (keratolytics like salicylic acid) or to restore the lipid barrier (emollients and barrier repair therapies) (Clinical, Cosmetic and Investigational Dermatology, 2015). This target is fundamental to dermatological health, as its integrity determines skin hydration, sensitivity, and resistance to external stressors.

Other names

CorneodesmosomesStratum corneum extracellular matrixIntercellular lipid lamellaeSkin barrier componentsCorneocyte adhesion complexBrick and mortar model components

Keratolysis through the degradation of corneodesmosomal proteins; Barrier restoration via the replenishment of intercellular lipids; Humectancy to increase water retention within the stratum corneum; Modulation of keratinocyte differentiation and desquamation rates.