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Trinh, Thuy‐Tien Thi; Choi, Jae Hee; Yang, Jee‐Eun; Kim, Woon Ha; Chien, Pham Ngoc; Le, Linh Thi Thuy; Ngan‐Giang, Nguyen; Nga, Pham Thi; Nam, Sun‐Young; Heo, Chan‐Yeong
Skin research and technology, April 2024, Volume: 30, Issue: 4Journal Article
Background Natural products are often friendly and can be used on children's skin after systematic and careful research. Therefore, in this study, the Royal Oji Complex (ROC), a product with natural ingredients, was used to study their effectiveness on keratinocytes taken from the skin of children from 0 to 3 years old. Method Normal human epidermal keratinocytes and tissue‐isolated keratinocytes (TIKC) from young donors were treated with three different concentrations of ROC: 0.1, 1, and 10 ppm. The mRNA expression of the epidermal barrier's essential genes, such as hyaluronic acid synthase 3 (Has3), involucrin (IVL), loricrin (LOR), and claudin‐1 (CLD1) was investigated using qRT‐PCR. Ceramide content was measured by ELISA, with retinoic acid (R.A.) and amarogentin (AMA) serving as positive controls. Results ROC significantly elevated HAS3 gene expression in HEKn cells, especially at 10 ppm, indicating potential advantages for skin hydration in young infants. IVL increased at first but decreased as ROC concentrations increased. LOR was upregulated at lower ROC concentrations but reduced at higher doses. CLD1 gene expression increased considerably in HEKn but reduced with increasing ROC doses. Ceramide concentration increased somewhat but not significantly at 10 ppm. Conclusion ROC shows potential in altering keratinocyte gene expression, with unique responses in HEKn and TIKC from young donors. While changes in ceramide content were insignificant, these results help to comprehend ROC's multiple effects on young children's skin.
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