Inhibitory effect of ephedrannins A and B from roots of Ephedra sinica STAPF on melanogenesis.
Biochim Biophys Acta
; 1850(7): 1389-96, 2015 Jul.
Article
en En
| MEDLINE
| ID: mdl-25857772
ABSTRACT
BACKGROUND:
Melanogenesis, a process producing the pigment melanin in human skin, eyes and hair, is a major physiological response against various environmental stresses, in particular exposure to ultraviolet radiation, and its pathway is regulated by a key enzyme, tyrosinase. In this study, we evaluated the effects of ephedrannins A and B, which are polyphenols from the roots of Ephedra sinica, commonly used in herbalism in oriental countries, on mushroom tyrosinase and melanogenesis in B16F10 melanoma cells.METHODS:
Their effects on mushroom tyrosinase were determined via kinetic studies using a spectrophotometric analysis and those on melanin and tyrosinase production in melanoma cells treated with α-MSH (melanin stimulating hormone) were examined using PCR and ELISA.RESULTS:
Both ephedrannins A and B exhibited concentration-dependent inhibitory effects on L-tyrosine oxidation by mushroom tyrosinase, and the inhibition mechanism was competitive and reversible with L-tyrosine as the substrate. In addition, melanin production in melanoma cells was also suppressed in a concentration-dependent manner by ephedrannins A and B without significant effects on cell proliferation at the concentrations tested. Both compounds showed inhibitory effects on melanin production by suppressing the transcription of tyrosinase in the cells.CONCLUSION:
Both compounds exhibited significant inhibitory effects, but the inhibition by ephedrannin B was much more effective than that by ephedrannin A. Both ephedrannins A and B may be good candidates for a whitening agent for skin. GENERALSIGNIFICANCE:
This is the first report that describes effective inhibition of melanin production by ephedrannins A and B isolated from Ephedra roots.Palabras clave
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Banco de datos:
MEDLINE
Asunto principal:
Monofenol Monooxigenasa
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Raíces de Plantas
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Ephedra sinica
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Proantocianidinas
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Melaninas
Límite:
Animals
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Humans
Idioma:
En
Año:
2015
Tipo del documento:
Article