METHODS: Cellular assays tested six different concentrations (up to 5%) of the PE for cell viability levels and reactive oxygen species (ROS) levels of human immortalised epidermal cells (HaCaTs). The identified non-cytotoxic concentration (0.5% PE) was then tested by gene assays. A commercial foundation containing 0.5% PE (PEF0.5) was tested for safety, skin protective effectiveness, and user satisfaction.
RESULTS: Compared to the control groups, 0.5% PE had a significant inhibitory effect on the expression level of MMP-1 but promoted the expression of COL1A1, COL3A1, ELN, and AQP3. PEF0.5 significantly (p 0.05) differences were detected in the foundation's effectiveness and usability.
CONCLUSION: Applying PEF0.5 for 28 days may improve the skin barrier function, as indicated by skin TEWL, hydration, wrinkle, elasticity, and sebum content, without any adverse effects.
RESULTS: AAE could significantly lengthen the mean lifespan, 50% survival days, and maximum lifespan of D. melanogaster, especially when the amount of AAE added reached 6.68 mg mL-1, the mean lifespan of both female and male flies increased by 23.74% and 22.30%, respectively, indicating the effective life extension effect of AAE. At the same time, AAE could improve the climbing ability and tolerance to hydrogen peroxide in D. melanogaster. In addition, the addition of AAE effectively increased the activities of copper-zinc-containing superoxide dismutase, manganese-containing superoxide dismutase and catalase in D. melanogaster and reduced the contents of malondialdehyde. Moreover, when reared with diets containing AAE, the expression of antioxidant-related genes SOD1, SOD2 and CAT was up-regulated in D. melanogaster and down-regulated for MTH genes.
CONCLUSION: The study indicates that AAE effectively enhances the antioxidant capacity of D. melanogaster and has potential applications as an antioxidant and anti-ageing agent in the nutraceutical industry. © 2024 Society of Chemical Industry.