| Autor: |
Xiao Cui, Tingyan Mi, Xue Xiao, Hong Zhang, Yiying Dong, Nan Huang, Ping Gao, Jianming Lee, Guelakis, Marian, Xuelan Gu |
| Předmět: |
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| Zdroj: |
Journal of the European Academy of Dermatology & Venereology; 2024 Supplement, Vol. 38, p3-11, 9p |
| Abstrakt: |
Background: Although glutathione (GSH) has long been considered a master antioxidant, poor stability and bioavailability limit its application in skin protection. To overcome the challenges, Unilever R&D formulated a Glutathione Amino acid Precursors blend (named GAP) to boost GSH de novo synthesis. Objective: Determine whether GAP can boost GSH levels and provide skin protection against stressors. Methods: Normal human epidermal keratinocytes were treated with GAP, with or without stressors, namely, menadione, blue light or pollutants. Ascorbic acid was used as a benchmark. The levels of GSH, glutathione disulfide (GSSG), adenosine triphosphate (ATP) and reactive oxygen species (ROS) were quantified. A placebocontrolled clinical study was conducted on 21 female subjects who received product applications and subsequent UV radiation. Tape strip samples were collected from the subjects for GSH and GSSG quantification using ultra-performance liquid chromatography-mass spectrometry/mass spectrometry (UPLC-MS/MS). The UVprotective effect of GAP was investigated using ex vivo skin. Biomarkers related to DNA damage and the skin barrier were analysed using immunohistochemistry. Results: Glutathione amino acid precursors significantly increased the GSH levels and GSH/GSSG ratio in normal human epidermal keratinocytes. Menadione treatment resulted in excessive ROS production and a decline in ATP levels, which were effectively abrogated by GAP. The protective effects of GAP against menadioneinduced oxidative stress were superior to those of ascorbic acid. In addition, GAP effectively protected the cells against blue light-induced ROS production and pollutant-induced ATP depletion. Topical application of the GAP formulation significantly elevated the skin GSH/GSSG ratio in a clinical study. Ex vivo skin treated with the GAP formulation displayed a reduction in DNA damage and high levels of barrier proteins after UV exposure. Conclusions: Glutathione amino acid precursors effectively increases cellular GSH levels to protect the skin from oxidative and environmental stresses. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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