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Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
Published on: September 7, 2013
α-Ionone protects against UVB-induced photoaging in epidermal keratinocytes
Ruixuan Geng1, Seong-Gook Kang2, Kunlun Huang1,3,4
1Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
Objective:
To evaluate whether α-ionone, an aromatic compound mainly found in raspberries, carrots, roasted almonds, fruits, and herbs, inhibits UVB-mediated photoaging and barrier dysfunction in a human epidermal keratinocyte cell line (HaCaT cells).
Methods:
The anti-photoaging effect of α-ionone was evaluated by detecting the expression of barrier-related genes and matrix metalloproteinases (MMPs) in HaCaT cells. The levels of reactive oxygen species, oxidation product, antioxidant enzyme, and inflammatory factors were further analysed to underline the protective effect of α-ionone on epidermal photoaging.
Results:
It was found that α-ionone attenuated UVB-induced barrier dysfunction by reversing keratin 1 and filaggrin in HaCaT cells. α-Ionone also reduced the protein amount of MMP-1 and mRNA expression of MMP-1 and MMP-3 in UVB-irradiated HaCaT cells, implying protective effects on extracellular matrix. Furthermore, HaCaT cells exposed to α-ionone showed significant decreases in interleukin (IL)-1β, IL-6, IL-8, and tumor necrosis factor-α as compared to UVB-irradiated HaCaT cells. α-Ionone treatment significantly inhibited the UVB-induced intracellular reactive oxygen species increase and malondialdehyde accumulation. Therefore, the beneficial effects of α-ionone on inhibiting MMPs secretion and barrier damage may be related to attenuated inflammation and oxidative stress.
Conclusion:
Our results highlight the protective effects of α-ionone on epidermal photoaging and promote its clinic application as a potential natural anti-photodamage agent in future.
Insights
Alpha-ionone, a natural compound, effectively combats UVB-induced skin aging and barrier damage by reducing inflammation and oxidative stress. This study highlights its potential as a natural anti-photodamage agent.
Area of Science:
- Dermatology
- Cosmetic Science
- Biochemistry
Background:
- UVB radiation causes photoaging and skin barrier dysfunction.
- Alpha-ionone is a natural aromatic compound found in various plants.
- Understanding its effects on skin cells is crucial for developing new skincare ingredients.
Purpose of the Study:
- To investigate the inhibitory effects of alpha-ionone on UVB-induced photoaging and barrier dysfunction in human epidermal keratinocytes (HaCaT cells).
Main Methods:
- HaCaT cells were exposed to UVB radiation with and without alpha-ionone treatment.
- The expression of barrier-related genes (keratin 1, filaggrin) and matrix metalloproteinases (MMPs) was analyzed.
- Levels of reactive oxygen species, oxidative products, antioxidant enzymes, and inflammatory factors (IL-1β, IL-6, IL-8, TNF-α) were measured.
Main Results:
- Alpha-ionone reversed UVB-induced decreases in keratin 1 and filaggrin, improving barrier function.
- It reduced MMP-1 protein and MMP-1/MMP-3 mRNA expression, protecting the extracellular matrix.
- Alpha-ionone significantly decreased inflammatory cytokines and inhibited UVB-induced reactive oxygen species and malondialdehyde accumulation.
Conclusions:
- Alpha-ionone demonstrates protective effects against UVB-induced epidermal photoaging and barrier impairment.
- Its benefits are linked to the attenuation of inflammation and oxidative stress.
- Alpha-ionone shows promise as a natural agent for clinical application against photodamage.
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