Premium
Antimelanogenesis effect of Tunisian herb Thymelaea hirsuta extract on B16 murine melanoma cells
Author(s) -
Kawano Mitsuko,
Matsuyama Kyoko,
Miyamae Yusaku,
Shinmoto Hiroshi,
Kchouk Mohamed Elyes,
Morio Takahiro,
Shigemori Hideyuki,
Isoda Hiroko
Publication year - 2007
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/j.1600-0625.2007.00618.x
Subject(s) - melanin , tyrosinase , melanoma , phosphorylation , mapk/erk pathway , cytotoxicity , viability assay , chemistry , herb , microbiology and biotechnology , cell , biochemistry , biology , enzyme , cancer research , in vitro , traditional medicine , medicine , medicinal herbs
Skin pigmentation is the result of melanogenesis that occurs in melanocytes and/or melanoma cells. Although melanogenesis is necessary for the prevention of DNA damage and cancer caused by UV irradiation, excessive accumulation of melanin can also cause melanoma. Thus, we focused on the antimelanogenesis effect of an extract from Thymelaea hirsuta , a Tunisian herb. Murine melanoma B16 cells were treated with T. hirsuta extract, and then cell viability and synthesized melanin content were measured. We found that the T. hirsuta extract decreased the synthesized melanin content in B16 cells without cytotoxicity. Tyrosinase is a key enzyme of melanogenesis and extracellular signal‐regulated kinase (ERK)‐1/2 phosphorylation is known to be related to melanogenesis inhibition. To clarify its mechanism, we also determined ERK1/2 phosphorylation and tyrosinase expression level. ERK1/2 was immediately phosphorylated in cells just after treatment with the extract. The tyrosinase expression was inhibited after 24 h of stimulation with the extract. The T. hirsuta extract was fractionated, and we found that one fraction considerably decreased the melanin synthesis in B16 cells and that this fraction contains daphnanes as the main component. This indicates that our findings might be attributable to daphnanes.