Extracellular and cellular proteins and lipids of the skin

Extracellular and cellular proteins and lipids of the skin represent the collective molecular framework of the integumentary system, primarily focused on the stratum corneum and the underlying dermis. This complex includes structural proteins like keratins, filaggrin, and collagen, alongside a specialized lipid matrix composed of ceramides, cholesterol, and free fatty acids (StatPearls, "Physiology, Skin"). These components function synergistically to maintain the skin's permeability barrier, regulate transepidermal water loss, and provide mechanical resilience against environmental stressors (PubMed, PMID: 24656726). Dysregulation or depletion of these proteins and lipids is a hallmark of various dermatological disorders, including atopic dermatitis and ichthyosis, where barrier failure leads to chronic inflammation. Pharmacological and cosmetic interventions typically involve the topical application of barrier-mimetic lipids or humectants to restore hydration and structural integrity (Journal of Clinical and Aesthetic Dermatology, 2014). While not a single molecular target, this assembly is the primary site of action for topical therapeutics and protective agents.

Other names

Skin barrier componentsCutaneous proteins and lipidsDermal and epidermal matrixStratum corneum lipids and proteins

Restoration of the skin's physical barrier, humectancy to increase water content, and structural supplementation of the extracellular matrix.