Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Inhibitory effect of Aralia elata ethanol extract against skin damage in UVB-exposed human keratinocytes and human dermal fibroblasts

두릅순 에탄올 추출물의 인간유래 피부각질형성세포와 피부섬유아세포에서의 자외선에 의한 광노화 억제효과

  • Yang, Jiwon (Institute on Aging, Seoul National University College of Medicine) ;
  • Kwak, Chungshil (Institute on Aging, Seoul National University College of Medicine)
  • 양지원 (서울대학교 의과대학 노화고령사회연구소) ;
  • 곽충실 (서울대학교 의과대학 노화고령사회연구소)
  • Received : 2016.11.02
  • Accepted : 2016.11.29
  • Published : 2016.12.31
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Abstract

Purpose: Solar ultraviolet (UV) radiation causes inflammation and matrix metalloproteinase (MMP) overexpression and extracellular matrix depletion, leading to skin photoaging such as wrinkle formation, dryness, and sagging. Activation of MMP is influenced by various molecules such as reactive oxygen species (ROS), proinflammatory cytokines, and transient receptor potential vanilloid type (TRPV)-1, which are increased in UV-irradiated skin cells. Aralia elata (AE) ethanolic extract was reported to inhibit ROS generation caused by UVB-irradiation in keratinocytes. In this study, we investigated the photoprotective effect of AE ethanolic extract on UVB-irradiated human keratinocytes (HaCaT) and human dermal fibroblasts (HDF). Methods: AE was freeze-dried, extracted in 70% ethanol, and concentrated. Skin cells were treated with AE extract for 24 h and then exposed to UVB ($55mJ/cm^2$). After 48 h of incubation, proinflammatory cytokines, MMP-1, type-1 procollagen, and TRPV-1 levels were measured by ELISA or Western blotting. Results: Treatment with AE extract ($100{\mu}g/mL$) significantly inhibited UVB-induced IL-6, IL-8, and $PGE_2$ production in HaCaT by 25.6%, 5.3%, and 70.2%, respectively, and also inhibited elevation of MMP-1 and TRPV-1 caused by UVB irradiation by 20.0% and 41.9%, respectively (p < 0.05). In HDF, AE extract treatment significantly inhibited both elevation of MMP-1 and reduction of type-1 procollagen caused by UVB irradiation (p < 0.05). In addition, type-1 procollagen was elevated by AE extract treatment in normal HDFs (p < 0.05). Conclusion: AE 70% ethanol extract has photoprotective ability via reduction of proinflammatory mediators, TRPV-1 and MMP-1 production, and elevation of collagen synthesis. Our findings suggest that AE extract might be a good natural material to protect against UVB-induced premature skin aging.

본 연구에서는 피부의 표피와 진피에 분포하는 HaCaT 세포와 HDF 세포를 이용하여 항산화효과가 우수한 두릅순 추출물의 처리가 UVB에 의한 피부광노화를 억제할 수 있는지 알아보기 위하여 피부 염증반응과 관련한 사이토카인과 피부의 주요 구성 단백질인 collagen에 영향을 미칠 수 있는 MMP-1, type-I procollagen, TRPV-1 등의 단백질 발현에 미치는 영향을 분석하였다. HaCaT에 두릅순 추출물을 24시간 전처리한 경우 UVB ($55 mJ/cm^2$) 노출로 인해 증가한 염증매개인자인 IL-6, IL-8, $PGE_2$를 유의하게 감소시켰다. 또한, 피부 collagen의 정상적인 구조 및 양에 영향을 미치는 단백질들의 발현을 측정한 결과 HaCaT에서는 UVB 조사로 인해 증가한 TRPV-1과 MMP-1 단백질의 발현이 두릅순 에탄올 추출물의 전처리로 모두 감소하였고, HDF에서는 UVB를 조사한 대조군에 비하여 두릅순 추출물 처리가 MMP-1 단백질 발현을 감소시키는 동시에 collagen의 전구체인 type-I procollagen의 발현을 증가시키는 효과를 보였다. 이들 결과들로부터 항산화효과가 우수한 두릅순 70% 에탄올 추출물은 피부세포에서 UVB에 의한 염증반응을 억제시키는 동시에 피부 collagen의 감소를 억제시킴으로써 피부 광노화를 예방할 수 있는 천연 소재로 이용될 수 있다고 본다.

Keywords

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