Journal of the Society of Cosmetic Scientists of Korea (대한화장품학회지)

Society of Cosmetic Scientists of Korea (대한화장품학회)
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The Inhibitory Effects of Alnus Japonica Steud. Extract on Melanogenesis

적양 추출물의 멜라닌 합성 저해효과

  • 이준영 ((주)사임당화장품 기술연구소) ;
  • 임경란 ((주)사임당화장품 기술연구소) ;
  • 정택규 ((주)사임당화장품 기술연구소) ;
  • 윤경섭 ((주)사임당화장품 기술연구소)
  • Received : 2013.01.14
  • Accepted : 2013.04.28
  • Published : 2013.06.30
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Abstract

In order to develop new skin whitening agents, we prepared the EtOAc layer (AJE) after enzyme treatment of 75% EtOH extract of the Alnus Japonica Steud. We measured their tyrosinase inhibitory activity in vitro and melanin synthesis inhibitory activity in B16-F1 melanoma cells. They did not show inhibitory activity against mushroom tyrosinase but showed melanin synthesis inhibitory activity in a dose-dependent manner. In a melanin synthesis inhibition assay, AJE suppressed melanin production up to 52% at a concentration of $40{\mu}g/mL$. To elucidate the mechanism of the inhibitory effects of AJE on melanogenesis, we measured expression of melanogenesis-related proteins by the western blot assay. As a result, AJE suppressed the expression of tyrosinase related protein 1 (TRP-1) and microphthalmia associated transcription factor (MITF). Moreover, AJE increased the expression of phosphorylated extracellular signal-regulated kinase (p-ERK). These results conclude that ERK activation by AJE reduces melanin synthesis via MITF downregulation and is subsequent to the inhibition of TRP-1 expression. Therefore, we suggest that AJE could be used as active ingredients for skin whitening.

본 연구에서는 새로운 미백소재를 개발하기 위해 적양 에탄올추출물을 효소처리 후 EtOAc 분획물(AJE)을 준비하여 in vitro 상에서 이들의 tyrosinase 저해활성과 세포 수준에서의 멜라닌 합성 저해효과를 측정하였다. AJE는 mushroom tyrosinase의 활성에는 영향을 미치지 않았으나 B16-F1 melanoma cell을 이용한 멜라닌 합성 저해효과에 있어서 농도 의존적으로 멜라닌 합성을 저해하여, $40{\mu}g/mL$의 농도에서 52% 이상의 저해효과를 나타내었다. 이러한 멜라닌 합성 저해효과에 대한 작용 기전을 확인하기 위해 western blot을 통해 멜라닌 합성 경로에 관련된 단백질의 발현을 측정하였다. 그 결과 멜라닌 합성에 관여하는 효소인 tyrosinase related protein 1 (TRP-1)의 발현을 억제하였고, 이를 조절하는 전사인자인 microphthalmia associated transcription factor (MITF) 발현 역시 효과적으로 억제하였다. 또한 extracellular signal-regulated kinase (ERK) pathway를 활성화시킴으로써 phosphorylated extracellular signal-regulated kinase (p-ERK)의 발현을 상당히 증가시키는 것을 확인할 수 있었다. 이러한 결과는 AJE가 멜라닌 합성의 신호전달 경로 중 ERK pathway의 활성화를 통해 MITF의 분해를 촉진시키고 이로 인해 MITF의 발현을 감소시키며, 그 결과 멜라닌 합성에 관여하는 효소 중 TRP-1의 발현을 감소시킴으로써 멜라닌 합성을 저해하는 것으로 사료되며, 따라서 AJE는 미백용도의 기능성 원료로서의 가능성이 큰 것으로 판단된다.

Keywords

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