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Published on: September 7, 2013
Potent therapeutic effect of melatonin on aging skin in pinealectomized rats
Mukaddes Eşrefoğlu1, Muammer Seyhan, Mehmet Gül
1Department of Embryology and Histology, Faculty of Medicine, Inonu University, Malatya, Turkey. drmukaddes@hotmail.com
Abstract:
It is generally agreed that one of the major contributors to skin aging is reactive oxygen species. As organisms reach advanced age, free radical generation increases and the activity of tissue antioxidant enzyme system decreases. Melatonin is an antioxidant and free radical scavenger. The present study was first aimed to determine the morphometric and biochemical changes caused by long-term pinealectomy in order to investigate the role of melatonin as skin architecture. Secondly, the effect of exogenous melatonin administration on these changes was determined. Rats were pinealectomized or sham operated (control) for 6 months. Half of the pinealectomized rats were treated with 4 mg/kg melatonin during the last month of the experiment. Pinealectomy resulted in important morphometric and biochemical changes in the back, abdominal and thoracic skin. The thickness of epidermis and dermis and the number of dermal papillae and hair follicles were reduced. Melatonin administration to pinealectomized rats significantly improved these alterations in all body areas (P < 0.005). On the contrary, in pinealectomized rats the levels of antioxidant enzymes, catalase and glutathione peroxidase were decreased. Melatonin restored the levels of these enzymes. The pinealectomy-induced increases in lipid peroxidation in the abdominal and thoracic skin were significantly reduced by melatonin treatment (P < 0.005 and 0.01 respectively). These results suggest that melatonin is highly efficient anti-aging factor and, as melatonin levels decrease with age, melatonin treatment may reduce age-related skin changes.
Insights
Melatonin, a key antioxidant, counteracts skin aging. Studies show pinealectomy (melatonin removal) damages skin structure and reduces antioxidant enzymes, but melatonin treatment reverses these effects, suggesting its anti-aging potential.
Area of Science:
- Dermatology
- Endocrinology
- Biochemistry
Background:
- Reactive oxygen species contribute significantly to skin aging.
- Aging is associated with increased free radical generation and decreased antioxidant enzyme activity.
- Melatonin is a potent antioxidant and free radical scavenger.
Purpose of the Study:
- To investigate the role of melatonin in skin architecture by examining morphometric and biochemical changes after long-term pinealectomy.
- To evaluate the efficacy of exogenous melatonin administration in mitigating these age-related skin changes.
Main Methods:
- Rats underwent pinealectomy or sham surgery for six months.
- A subset of pinealectomized rats received melatonin supplementation during the final month.
- Morphometric analysis (skin thickness, dermal papillae, hair follicles) and biochemical assays (antioxidant enzymes, lipid peroxidation) were performed.
Main Results:
- Pinealectomy led to reduced skin thickness, fewer dermal papillae and hair follicles, and decreased levels of catalase and glutathione peroxidase.
- Melatonin treatment significantly improved these morphometric and biochemical alterations in pinealectomized rats.
- Melatonin administration also reduced lipid peroxidation and restored antioxidant enzyme levels.
Conclusions:
- Melatonin plays a crucial role in maintaining skin architecture and combating oxidative stress.
- Exogenous melatonin administration can effectively reverse age-related skin damage induced by melatonin deficiency.
- Melatonin is a promising anti-aging factor for mitigating age-related skin changes.
