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Updated: Sep 16, 2025

Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model
Published on: September 7, 2013
Polynucleotide Mixture Attenuates Ultraviolet B-Induced Skin Pigmentation.
Seyeon Oh1, Hee-Dae Jeon2, Nark-Kyoung Rho3
1Functional Cellular Networks Laboratory, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon 21999, Republic of Korea.
Polynucleotide (PN) and a PN mixture (PNM) effectively reduce skin darkening by decreasing oxidative stress and inflammation. PNM demonstrated a stronger anti-melanogenic effect than PN alone in UVB-exposed skin.
Area of Science:
- Dermatology
- Biochemistry
- Molecular Biology
Background:
- Ultraviolet (UV) radiation induces melanogenesis, causing cosmetic skin issues.
- UV exposure increases oxidative stress and activates nuclear factor-kappa B (NF-κB), leading to NLRP3 inflammasome activation.
Purpose of the Study:
- To investigate the anti-melanogenic effects of polynucleotide (PN) and a PN mixture (PNM).
- To compare the efficacy of PN and PNM in reducing UV-induced skin damage and hyperpigmentation.
Main Methods:
- Assessed oxidative stress markers (NADPH oxidase, GSH:GSSG ratio, 8-OHdG) in UVB-irradiated keratinocytes.
- Quantified NLRP3 inflammasome components (NLRP3, ASC, pro-caspase-1) and IL-18 expression.
- Evaluated melanogenesis-related signaling pathways (MITF, tyrosinase, TRP1/2) and melanin content in vitro and in vivo.
Main Results:
- Both PN and PNM reduced oxidative stress and NLRP3 inflammasome activation in UVB-exposed keratinocytes.
- PN and PNM decreased melanogenesis-related gene expression and melanin accumulation in UVB-irradiated skin.
- PNM exhibited a more potent anti-melanogenic effect compared to PN.
Conclusions:
- PN and PNM effectively mitigate UV-induced melanogenesis by reducing oxidative stress, NF-κB, and NLRP3 inflammasome activation.
- PNM offers superior benefits for skin lightening and protection against UV-induced hyperpigmentation.
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