Effective association of ceramide-coassembled lipid nanovehicles with stratum corneum for improved skin barrier function and enhanced skin penetration.

Herein, we report on a ceramide-coassembled lipid nanovehicle (CLNV) system that can enhance the penetration of active ingredients through the skin barrier by taking advantage of molecular associations between ceramide and lipids in the stratum corneum (SC) layer. For this purpose, we fabricated CLNVs consisting of an asymmetric lipid and a cholesterol derivative. They showed excellent long-term dispersion stability without molecular crystallization of ceramide. Upon forming a stable aqueous dispersion, the CLNVs retained their initial vehicle structure even under harsh conditions including high storage temperatures or salinity conditions. From in vitro skin barrier recovery tests, we observed that topical treatment with CLNVs induced the SC to restore its lamellar structure to the same condition as that prior to chemical damage. An in vivo skin penetration study additionally confirmed that skin penetration was enhanced, since the CLNVs were able to effectively interact with the SC layer. From these results, the CLNVs with robust molecular layer endow various applications in wide range applications including transdermal pharmaceutics delivery systems and cosmetics field.