Skin surface proteins and barrier components

Skin surface proteins and barrier components refer to the complex assembly of proteins, lipids, and enzymes within the stratum corneum that maintain the skin's physical and chemical integrity (StatPearls, NBK513299). Key structural proteins include filaggrin, loricrin, and involucrin, which form the cornified envelope, while lipids such as ceramides, cholesterol, and free fatty acids create a hydrophobic seal (PubMed, PMC5967208). These components collectively prevent transepidermal water loss (TEWL) and protect against environmental pathogens, allergens, and irritants (NIH, PMC2843412). Dysregulation or genetic mutations in these components, particularly filaggrin (FLG), are central to the pathogenesis of inflammatory skin diseases like atopic dermatitis and various forms of ichthyosis (UniProt, P20930). Therapeutic strategies often focus on replenishing these components through topical emollients or modulating the enzymes, such as kallikreins, involved in desquamation to restore barrier function (PubMed, PMC5608132). Additionally, the acidic pH of the skin surface, maintained by these components, is crucial for antimicrobial defense and enzyme activity (PubMed, PMC4471124). Modern pharmacological interventions aim to not only provide a passive barrier but also to stimulate the endogenous production of these essential proteins and lipids (PubMed, PMC3033356).

Other names

Epidermal barrierSkin barrierStratum corneum barrierCornified envelope components

Restoration of lipid bilayer integrity, humectant-mediated hydration, and enzymatic regulation of desquamation to improve skin barrier function.