Epidermal Barrier integrity is deteriorated in many skin conditions, including Atopic Dermatitis, and could be responsible for many of the associated clinical symptoms. The aim of this study was to determine the effect of REPAVAR ATOPIC SKIN BODY CREAM EXTREME, product containing "SKIN CALM COMPLEX" on barrier epidermis structure. Morphologic and structural evaluations were conducted on reconstructed human epidermis, by qualitative (hematoxylin/eosin-and immune-staining) and quantitative (MTT assay) techniques. Immature (Age Day 10) and mature (Day 17) sample tissues were treated with the product for 24 hours or 7 days, respectively. Morphological and quantitative analysis revealed an increase in the thickness of the epidermis in both cases after the treatment. The study by immunostaining showed that Product-treated tissues presented excellent localization of: 1) E-cadherin in keratinocytes of the spinous layer; 2) Filaggrin and Loricrin, in the granular layer; and 3) increased expression of Involucrin and Keratin 10 in suprabasal layers and 4) elevated expression of Keratin 5 in the basal layer of the epidermis. The product REPAVAR ATOPIC SKIN BODY CREAM EXTREME increases the epithelial regeneration and differentiation determined by cell proliferation and the expression and localization of specific proteins, improving the epidermal barrier effect.

Atopic dermatitis is classified as a chronic inflammatory skin disease, which is characterized by alterations in barrier function and immune system of the skin. In a previous study, the efficacy of REPAVAR ATOPIC SKIN BODY CREAM EXTREME (a product containing "SKIN CALM COMPLEX") on the epidermal barrier structure was demonstrated. However, the product has also been formulated to improve inflammation and itching. The aim of this study is to analyze product effectiveness on skin inflammation and itching which is associated with atopic dermatitis, by quantification of IL-1α and IL-8 interleukins secreted by human keratinocytes from reconstructed epidermis by ELISA assay. Mature (aged 17 days) sample tissues were treated with pro-inflammatory agents (PBS 1X and LPS) and with the product containing synergistic mix from plants extracts and Dihydroavenanthramide D, among other ingredients ("SKIN CALM COMPLEX") for 24 hours. Measuring the amounts of interleukins by ELISA assay showed 1) decreased levels of IL-1α and 2) no differences about IL-8 secretion. Product REPAVAR ATOPIC SKIN BODY CREAM EXTREME has an antiinflammatory effect on the release of pro-inflammatory cytokines, becoming an effective preventive agent on inflammation and itching due to maintenance and improvement of the keratinocyte epidermal structure.