Opuntiol Prevents Photoaging of Mouse Skin via Blocking Inflammatory Responses and Collagen Degradation
P Veeramani Kandan1, Agilan Balupillai1,2, G Kanimozhi3
1Department of Biochemistry & Biotechnology, Annamalai University, Annamalainagar, 608 002 Tamil Nadu, India.
Abstract:
In the present study, we investigated the potential of opuntiol, isolated from Opuntia ficus-indica, against UVA radiation-mediated inflammation and skin photoaging in experimental animals. The skin-shaved experimental mouse was subjected to UVA exposure at the dosage of 10 J/cm2 per day for ten consecutive days (cumulative UVA dose: 100 J/cm2). Opuntiol (50 mg/kg b.wt.) was topically applied one hour before each UVA exposure. UVA (100 J/cm2) exposure induces epidermal hyperplasia and collagen disarrangement which leads to the photoaging-associated molecular changes in the mouse skin. Opuntiol pretreatment prevented UVA-linked clinical macroscopic skin lesions and histological changes in the mouse skin. Further, opuntiol prevents UVA-linked dermal collagen fiber loss in the mouse skin. Short-term UVA radiation (100 J/cm2) activates MAPKs through AP-1 and NF-κB p65 transcriptional pathways and subsequently induces the expression of inflammatory proteins and matrix-degrading proteinases in the mouse skin. Interestingly, opuntiol pretreatment inhibited UVA-induced activation of iNOS, VEGF, TNF-α, and COX-2 proteins and consequent activation of MMP-2, MMP-9, and MMP-12 in the mouse skin. Moreover, opuntiol was found to prevent collagen I and III breakdown in UVA radiation-exposed mouse skin. Thus, opuntiol protects mouse skin from UVA radiation-associated photoaging responses through inhibiting inflammatory responses, MAPK activation, and degradation of matrix collagen molecules.
Insights
Opuntiol from Opuntia ficus-indica protects skin from UVA damage. It prevents inflammation, collagen loss, and photoaging by inhibiting key molecular pathways.
Area of Science:
- Dermatology
- Pharmacology
- Natural Products Chemistry
Background:
- Ultraviolet A (UVA) radiation is a primary driver of skin photoaging and inflammation.
- UVA exposure leads to molecular changes, including collagen degradation and inflammatory responses.
- Opuntiol is a compound isolated from Opuntia ficus-indica with potential therapeutic properties.
Purpose of the Study:
- To investigate the protective effects of opuntiol against UVA-induced skin inflammation and photoaging in a mouse model.
- To elucidate the molecular mechanisms underlying opuntiol's protective action against UVA radiation.
Main Methods:
- Mice were exposed to UVA radiation (10 J/cm² daily for 10 days).
- Opuntiol (50 mg/kg b.wt.) was applied topically before each UVA exposure.
- Skin histology, collagen integrity, and the expression of key inflammatory and matrix-degrading proteins were analyzed.
Main Results:
- Opuntiol pretreatment prevented UVA-induced epidermal hyperplasia, collagen disarrangement, and skin lesions.
- Opuntiol inhibited UVA-induced activation of inflammatory markers (iNOS, VEGF, TNF-α, COX-2) and matrix metalloproteinases (MMP-2, MMP-9, MMP-12).
- Opuntiol preserved collagen I and III integrity in UVA-exposed mouse skin.
Conclusions:
- Opuntiol demonstrates significant photoprotective effects against UVA radiation-induced skin damage.
- Opuntiol mitigates photoaging by suppressing inflammatory pathways, MAPK activation, and collagen degradation.
- Opuntiol is a promising natural compound for preventing UVA-associated skin aging and inflammation.
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