Improvement Effect and Mechanism of Hydroxytyrosol on Skin Aging Induced Advanced Glycation End Products
Rui Fan1, Yuxin Ma1, Meng Sun1
1Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Haidian District, Beijing 100191, China.
Abstract:
Objectives: Skin aging, often accelerated by dietary advanced glycation end products (AGEs), poses both cosmetic and health challenges. This study explores the protective effects of hydroxytyrosol (HT), a potent antioxidant found in olives, against AGEs-induced skin aging in mice. Methods: A total of forty-eight 8-month-old specific pathogen-free (SPF) male C57BL/6J mice were randomly assigned to one of four groups: control, model, low-dose hydroxytyrosol (HT25), and high-dose hydroxytyrosol (HT50). An additional group of six 6-week-old SPF male C57BL/6J mice served as the youth group. The experimental period lasted 16 weeks. Following the intervention, skin, serum, and ileum samples were collected. Results: The results demonstrated that HT50 significantly increased skin moisture, epidermal thickness, and dermal thickness (p < 0.05). HT50 also significantly elevated hydroxyproline levels as well as superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities in the skin while reducing malondialdehyde (MDA) content (p < 0.05). Furthermore, HT50 significantly reduced the levels of interleukin-6 (IL-6), interleukin-1β (IL-1β), and tumor necrosis factor-α (TNF-α) (p < 0.05). Regarding intestinal integrity, hydroxytyrosol intervention (either HT25 or HT50) significantly increased the positive staining ratios of zonula occludens-1 (ZO-1) and occludin in the ileum (p < 0.05). Conclusions: HT improves skin hydration, thickness, and collagen levels while reducing oxidative stress and inflammation. Notably, HT also enhances intestinal barrier function, suggesting a role for the gut-skin axis. These findings highlight HT's potential as a natural intervention for skin aging.
Insights
Hydroxytyrosol (HT) effectively combats skin aging caused by advanced glycation end products (AGEs). This natural compound improves skin hydration, thickness, and collagen, while also enhancing gut barrier function.
Area of Science:
- Dermatology and aging research
- Nutraceuticals and natural product chemistry
- Gastroenterology and gut health
Background:
- Dietary advanced glycation end products (AGEs) accelerate skin aging, leading to cosmetic and health concerns.
- Hydroxytyrosol (HT), an antioxidant from olives, is investigated for its anti-aging properties.
- Understanding the impact of AGEs on skin and the potential protective role of HT is crucial.
Purpose of the Study:
- To evaluate the protective effects of hydroxytyrosol (HT) against AGEs-induced skin aging in mice.
- To assess HT's impact on skin hydration, thickness, collagen content, oxidative stress, and inflammation.
- To investigate HT's influence on intestinal barrier function.
Main Methods:
- Forty-eight 8-month-old male C57BL/6J mice were divided into control, AGEs model, and two HT-treated groups (HT25, HT50).
- Mice were treated for 16 weeks, with skin, serum, and ileum samples collected post-intervention.
- Skin and intestinal tissues were analyzed for various biomarkers, including hydration, thickness, collagen, oxidative stress markers (SOD, GSH-Px, MDA), inflammatory cytokines (IL-6, IL-1β, TNF-α), and tight junction proteins (ZO-1, occludin).
Main Results:
- High-dose HT (HT50) significantly increased skin moisture, epidermal and dermal thickness, and hydroxyproline levels.
- HT treatment reduced oxidative stress by decreasing malondialdehyde (MDA) and increasing superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) activities.
- HT intervention significantly lowered levels of inflammatory cytokines (IL-6, IL-1β, TNF-α) and enhanced intestinal barrier integrity by increasing ZO-1 and occludin expression.
Conclusions:
- Hydroxytyrosol (HT) demonstrates significant benefits for skin aging, improving hydration, thickness, and collagen content.
- HT effectively reduces oxidative stress and inflammation associated with skin aging.
- HT also enhances intestinal barrier function, highlighting the potential role of the gut-skin axis in aging and the therapeutic potential of HT.
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