Effects of ε-Viniferin and ε-Viniferin-Enriched Extract from Vitis labruscana B. ‘Campbell Early’ Cell Cultures on Wound Healing and Epidermal Barrier Restoration in Human Skin Cells

Skin wound healing and barrier restoration are complex, tightly regulated processes critical for maintaining skin integrity, particularly in aged or compromised skin. This study investigated the wound healing efficacy and epidermal barrier-restoring effects of ε-Viniferin, a bioactive resveratrol dimer, and Vino Chocolate™, a grape flower-derived extract from Vitis labruscana ‘Campbell Early’ cell cultures enriched with ε-Viniferin. An HPLC analysis confirmed a high concentration of ε-Viniferin (547.58 ppm) in the cell culture-derived extract. In vitro assays conducted on HaCaT keratinocytes and HDFn fibroblasts demonstrated that the treatment with ε-Viniferin and Vino Chocolate™ significantly enhanced fibroblast migration. ELISA analyses showed that both treatments induced a dose-dependent increase in pro-collagen type I (COL1A1), with ε-Viniferin at 1 ppm demonstrating superior efficacy compared to TGF-β1. Additionally, these compounds notably suppressed the expression of matrix metalloproteinases MMP-1 and MMP-3, displaying effects comparable to or greater than retinoic acid. The Western blot analysis further revealed an increased filaggrin expression in keratinocytes, suggesting an improved epidermal barrier function. Collectively, these results indicate that ε-Viniferin and Vino Chocolate™ effectively promote extracellular matrix remodeling, modulate inflammatory responses, and enhance epidermal barrier integrity. These findings highlight their potential as multifunctional bioactive agents for cosmeceutical applications and emphasize the advantages of plant cell culture technology as a sustainable, innovative platform for advanced skincare ingredient development.