Stratum corneum keratin and epidermal barrier proteins

The stratum corneum keratin and epidermal barrier proteins constitute the primary physical and chemical shield of the skin, essential for maintaining homeostasis and preventing environmental damage [1]. This group includes structural keratins (e.g., Keratin 1 and Keratin 10) and cornified envelope proteins like filaggrin, loricrin, and involucrin, which are cross-linked to form a resilient barrier [2]. Filaggrin is especially critical, as its degradation into natural moisturizing factors (NMFs) regulates skin hydration and pH [3]. Genetic mutations or inflammatory downregulation of these proteins are central to the pathogenesis of atopic dermatitis, psoriasis, and ichthyosis vulgaris [4]. Therapeutic strategies include the use of aryl hydrocarbon receptor (AhR) agonists like tapinarof to induce protein expression and keratolytics like urea to manage hyperkeratosis [5]. Furthermore, biologics that block IL-4 and IL-13 help restore the expression of these proteins by neutralizing the cytokines that suppress their production [6]. Sources: [1] NIH PMC5608132; [2] UniProt P04264; [3] PubMed 22134564; [4] StatPearls Atopic Dermatitis; [5] PubMed 33135112; [6] NIH PMC7395591.

Other names

Skin barrier proteinsCornified envelope proteinsStratum corneum structural proteinsEpidermal differentiation complex proteinsEpidermal barrierSkin barrier

Aryl hydrocarbon receptor (AhR) activation to induce protein expression; Keratolysis to soften or dissolve keratin; Vitamin D receptor (VDR) mediated differentiation; Retinoid receptor mediated modulation of keratin expression; Physical barrier supplementation.