Natural moisturizing factor component (urea-mediated water retention in stratum corneum) (NMF (urea))

The phrase "Water retention in stratum corneum via urea binding" does not refer to a single molecular target such as a receptor, enzyme, or transporter. Instead, it describes a **physiological process** involving the role of **urea**, an important component of the natural moisturizing factor (NMF), in maintaining hydration within the outermost layer of human skin—the stratum corneum. Urea is one of several small molecules that make up NMF. These components are highly efficient humectants that attract and bind water from the atmosphere into corneocytes—the cells comprising the stratum corneum—helping maintain adequate hydration even at low humidity levels[3][5]. This process is essential for preserving **skin elasticity**, barrier function, and overall appearance. Topical application of urea increases free water content at higher relative humidities by enhancing this natural mechanism[1]. Reduced levels or impaired function of NMF components—including urea—are associated with various dermatological conditions characterized by dry or flaky skin such as ichthyosis vulgaris and psoriasis[5]. While topical drugs containing urea are used therapeutically to restore moisture balance, there is no discrete molecular "target" for drug action; rather, these agents supplement physiological humectant activity. In summary, "water retention in stratum corneum via urea binding" refers to a critical aspect of epidermal physiology mediated by small-molecule humectants like urea but does not correspond to an individual therapeutic target protein or receptor. Therefore: Is this considered a therapeutic target? — No. Is there something wrong with this target? — Yes; it is not an individual molecule/receptor but rather describes a physiological property/process involving multiple factors.

Other names

Urea binding in stratum corneumWater retention via urea in skinNMF (Natural Moisturizing Factor) component, urea

Humectant action: Urea acts as a hygroscopic molecule, attracting and binding water within the stratum corneum to increase its hydration and plasticity[3][5][9].