Abstract
The red maple (Acer rubrum) is a rich source of phenolic compounds which possess galloyl groups attached to different positions of a 1,5-anhydro-d-glucitol core. While these glucitol-core containing gallotannins (GCGs) have reported anti-oxidant and anti-glycative effects, they have not yet been evaluated for their cosmetic applications. Herein, the anti-tyrosinase and anti-melanogenic effects of a proprietary phenolic-enriched red maple leaves extract [Maplifa™; contains ca. 45% ginnalin A (GA) along with other GCGs] were investigated using enzyme and cellular assays. The GCGs showed anti-tyrosinase activity with IC50 values ranging from 101.4 to 1047.3 μM and their mechanism of tyrosinase inhibition (using GA as a representative GCG) was evaluated by chelating and computational/modeling studies. GA reduced melanin content in murine melanoma B16F10 cells by 79.1 and 56.7% (at non-toxic concentrations of 25 and 50 μM, respectively), and its mechanisms of anti-melanogenic effects were evaluated by using methods including fluorescent probe (DCF-DA), real-time PCR, and western blot experiments. These data indicated that GA was able to: (1) reduce the levels of reactive oxygen species, (2) down-regulate the expression of MITF, TYR, TRP-1, and TRP-2 gene levels in a time-dependent manner, and (3) significantly reduce protein expression of the TRP-2 gene. Therefore, the anti-melanogenic effects of red maple GCGs warrant further investigation of this proprietary natural product extract for potential cosmetic applications.
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Abbreviations
- GCGs:
-
Glucitol-core containing gallotannins
- GA:
-
Ginnalin A
- GB:
-
Ginnalin B
- GC:
-
Ginnalin C
- MF:
-
Maplexin F
- MJ:
-
Maplexin J
- DCT:
-
DOPA-chrome tautomerase
- DOPA:
-
3,4-dehydroxyphenylalanine
- DHICA:
-
5,6-dihydroxyindol-2-carboxylic acid
- MITF:
-
Microphthalmia-associated transcription factor
- ROS:
-
Reactive oxygen species
- TYR:
-
Tyrosinase
- TRP-1:
-
Tryosinase-related protein-1
- TRP-2:
-
Tryosinase-related protein-2
- DCF-DA:
-
2′,7′-Dichlorodihydrofluorescein diacetate
- DMEM:
-
Dulbecco’s modified Eagle medium
- DMSO:
-
Dimethylsulfoxide
- MTS:
-
3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)2-(4-sulfophenyl)-2H-tetrazolium
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Acknowledgements
HM was supported by the Omar Magnate Foundation Fellowship. The spectroscopic data were acquired from instruments located in the RI-INBRE core facility supported by Grant # P20GM103430 from the National Institute of General Medical Sciences of the National Institutes of Health.
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HM and NPS are co-inventors on a patent application on the skin-whitening applications of maple gallotannins. The other authors declare no conflicts of interest.
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Ma, H., Xu, J., DaSilva, N.A. et al. Cosmetic applications of glucitol-core containing gallotannins from a proprietary phenolic-enriched red maple (Acer rubrum) leaves extract: inhibition of melanogenesis via down-regulation of tyrosinase and melanogenic gene expression in B16F10 melanoma cells. Arch Dermatol Res 309, 265–274 (2017). https://doi.org/10.1007/s00403-017-1728-1
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DOI: https://doi.org/10.1007/s00403-017-1728-1