Keratinocyte barrier repair pathways

Keratinocyte barrier repair pathways encompass the complex biological processes responsible for maintaining the integrity of the stratum corneum, the skin's outermost layer. These pathways involve the synthesis of structural proteins like filaggrin and involucrin, the production of essential lipids such as ceramides, and the formation of tight junctions and desmosomes (Source: StatPearls, Skin Barrier Function). Dysfunction in these pathways is a hallmark of inflammatory skin diseases like atopic dermatitis and psoriasis, where a compromised barrier leads to increased transepidermal water loss and allergen penetration (Source: Nature Reviews Disease Primers, Atopic Dermatitis). Therapeutic strategies often focus on activating nuclear receptors like PPARs or AhR to stimulate differentiation or using emollients to physically supplement the barrier (Source: Journal of Investigative Dermatology, PPARs in skin). Furthermore, signaling cascades involving cytokines like IL-4 and IL-13 can downregulate these repair pathways, making them indirect targets for monoclonal antibodies (Source: JCI, IL-4/IL-13 and the skin barrier). Overall, these pathways represent a functional network rather than a single molecular entity, serving as a critical interface between the body and the environment.

Other names

Epidermal barrier repairSkin barrier functionKeratinocyte differentiation programStratum corneum homeostasis

Restoration of lipid lamellae, induction of differentiation markers such as filaggrin and loricrin, and inhibition of Th2 cytokines that degrade the barrier.