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Anti-Inflammatory Effect of Ethanol Extract from Onion (Allium cepa L.) Peel on Lipopolysaccharide-Induced Inflammatory Responses in RAW 264.7 Cells and Mice Ears

LPS로 유도된 RAW 264.7 세포와 마우스 귀 조직에 대한 양파(Allium cepa L.) 껍질 에탄올 추출물의 항염증 효과

  • Ahn, Na-Kyung (Department of Food Science & Technology/Institute of Food Science, Pukyong National University) ;
  • Kang, Bo-Kyeong (Department of Food Science & Technology/Institute of Food Science, Pukyong National University) ;
  • Kim, Koth-Bong-Woo-Ri (Institute of Fisheries Sciences, Pukyong National University) ;
  • Kim, Min-Ji (Department of Food Science & Technology/Institute of Food Science, Pukyong National University) ;
  • Bae, Nan-Young (Department of Food Science & Technology/Institute of Food Science, Pukyong National University) ;
  • Park, Ji-Hye (Department of Food Science & Technology/Institute of Food Science, Pukyong National University) ;
  • Park, Sun-Hee (Department of Food Science & Technology/Institute of Food Science, Pukyong National University) ;
  • Ahn, Dong-Hyun (Department of Food Science & Technology/Institute of Food Science, Pukyong National University)
  • 안나경 (부경대학교 식품공학과/식품연구소) ;
  • 강보경 (부경대학교 식품공학과/식품연구소) ;
  • 김꽃봉우리 (부경대학교 수산과학연구소) ;
  • 김민지 (부경대학교 식품공학과/식품연구소) ;
  • 배난영 (부경대학교 식품공학과/식품연구소) ;
  • 박지혜 (부경대학교 식품공학과/식품연구소) ;
  • 박선희 (부경대학교 식품공학과/식품연구소) ;
  • 안동현 (부경대학교 식품공학과/식품연구소)
  • Received : 2015.07.30
  • Accepted : 2015.09.22
  • Published : 2015.11.30

Abstract

Inflammation is a complex process involving a variety of immune cells, which defend the body from harmful stimuli. However, pro-inflammatory cytokines and inflammatory mediators can also exacerbate diseases such as cancer. Onion peel contains several phenolic compounds, including quercetin at an amount 20 times greater in peel than edible flesh. Therefore, in this study, the anti-inflammatory effects of onion peel ethanol extract (OPEE) were investigated lipopolysaccharide-induced inflammatory response. In our results, NO production decreased in a dose-dependent manner. Secretion of IL-6, $TNF-{\alpha}$, and $IL-1{\beta}$ was suppressed by 44%, 53%, and 60% respectively, at $100{\mu}g/mL$. Moreover, OPEE also suppressed expression of COX-2, iNOS, $NF-{\kappa}B$, and MAPKs in a dose-dependent manner. Formation of mice ear edema was reduced at the highest dose tested compared to the control, and reduction of ear thickness was observed in the histological analysis as well. In the acute toxicity test, no morality was observed in mice administered 5,000 mg/kg body weight of OPEE over a 2-week observation period. These results suggest that OPEE may have significant effects on inflammatory factors and be a potential anti-inflammatory material.

양파 껍질 에탄올 추출물(OPEE)의 in vitro 및 in vivo에서 항염증 효과를 알아보기 위해 lipopolysaccharide(LPS)로 활성화된 RAW 264.7 세포로부터 분비되는 염증 관련 매개인자들의 발현량과 ICR 마우스모델을 이용한 귀 부종 및 조직 분석을 진행하였다. NO 및 염증성 cytokine(IL-6, $IL-1{\beta}$$TNF-{\alpha}$)의 분비량이 OPEE에 의해 농도 의존적으로 감소함을 확인하였다. iNOS 및 COX-2의 발현량은 LPS에 의해 증가하였으나, OPEE 처리에 의해 농도 의존적으로 발현량이 감소하였다. 전사인자인 $NF-{\kappa}B$의 활성과 인산화효소인 MAPKs(p-38, JNK 및 ERK)에서도 LPS에 의해 증가된 발현량이 OPEE에 의해 억제됨을 확인하였다. 따라서 NO 및 염증성 cytokine의 분비량 감소는 $NF-{\kappa}B$와 MAPKs의 활성 저해에 의한 것임을 확인하였다. In vivo 실험에서는 croton oil로 귀 부종을 유발한 마우스에 OPEE를 처리하였을 때 prednisolone 처리구와 유사한 수준으로 귀 부종이 억제되었으며, 귀 조직 관찰에서도 경피 및 진피의 두께와 진피로 침윤된 mast cell의 수도 억제됨을 확인하였다. 이상의 결과 OPEE는 항염증 소재로서 염증을 예방하거나 치료하는 데 이용 가능성이 높음을 제시한다.

Keywords

References

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