생명과학회지 (Journal of Life Science)

  • 제27권12호
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  • Pages.1452-1461
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  • 2017
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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Melanin 합성을 촉진하는 흑임자 에탄올추출물의 효능

Black Sesame Ethanolic Extract Promotes Melanin Synthesis

  • 투고 : 2017.08.23
  • 심사 : 2017.11.16
  • 발행 : 2017.12.30
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초록

백발화과정은 인간의 노화의 표현형 중 하나로 노화의 지표이다. 시간이 지남에 따라 사람 모낭에 melanocyte의 melanin 생성이 줄어들게 된다. 이의 원인으로는 모낭내 tyrosinase 활성의 감소와 활성 산소 종 중 $H_2O_2$에 의한 축적을 통해 나타난다. 천연물중에서 예로부터 흑모를 유도한다는 흑임자주정추출물의 비극성 층과 극성 층을 분리하여 항산화 효과 및 B16F1에서 melanin 생성 촉진 효과를 조사하였다. 항산화 실험에서 SBEEP와 SBEEO는 DPPH 소거 효과를 보여주지 않았고, 낮은 환원력을 보여주었다. SBEEP는 $8{\mu}g/ml$ 이상에서 세포 독성이 나타났고 SBEEO는 $4{\mu}g/ml$ 이상에서 세포 독성 효과를 보여주었다. SBEEP와 SBEEO는 in vitro에서 tyrosinase 활성과 DOPA 산화 활성에 대한 높은 melanin 합성 효과를 보여주었고, 살아있는 세포에서는 SBEEP처리군은 SBEEO 처리군보다 높은 melanin 합성 촉진 효과가 나타났다. 세포 내 melanin 생성에 효과가 있는 SBEEP는 melanin 합성 기전에서 중요한 효소인 TRP-2의 발현을 통해 melanin 생성을 촉진한다는 것을 발견하였다. 이러한 결과들은 흑임자의 SBEEP가 melanin 합성을 촉진할 수 있다는 가능성을 시사하고 있다.

Melanin production by melanocytes in human hair follicles decreases with time and leads to the graying process, which is a phenotype of human aging and an index of aging. The reduction in melanin production is the result of decreased tyrosinase activity in hair follicles and an accumulation of active oxygen species, such as hydrogen peroxide. This study investigated antioxidant effects and melanin-promoting effects in B16F1 cells treated with black sesame ethanolic nonpolar-soluble extract (SBEEO) and black sesame ethanolic polar-soluble extract (SBEEP). In antioxidation experiments, both SBEEP and SBEEO did not eliminate 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical, but SBEEO at $64{\mu}g/ml$ showed low reducing power. SBEEP exerted cytotoxic effects at concentrations greater than $8{\mu}g/ml$, whereas SBEEO showed cytotoxic effects at concentrations greater than $4{\mu}g/ml$. SBEEP and SBEEO induced melanin synthesis, tyrosinase activity, and DOPA oxidase activity in vitro. In live cells, melanin synthesis was greater in the SBEEP treatment group as compared with that in the SBEEO treatment group. SBEEP stimulated melanin synthesis by modulating the expression of tyrosinase-related protein-2 (TRP-2), which is an important enzyme in melanin synthesis. These results imply that SBEEP obtained from black sesame ethanolic extract may have the potential to improve melanin synthesis.

키워드

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