Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Suppressive Effect of Green Tea Seed Coat Ethyl Acetate Fraction on Inflammation and Its Mechanism in RAW264.7 Macrophage Cell

RAW264.7 Macrophage Cell에서 녹차씨껍질 에틸아세테이트 분획의 염증억제 효과 및 기전 연구

  • Noh, Kyung-Hee (School of Foods and Life Science, Institute of Basic Sciences, Inje University) ;
  • Jang, Ji-Hyun (School of Foods and Life Science, Institute of Basic Sciences, Inje University) ;
  • Min, Kwan-Hee (School of Foods and Life Science, Institute of Basic Sciences, Inje University) ;
  • Chinzorig, Radnaabazar (School of Foods and Life Science, Institute of Basic Sciences, Inje University) ;
  • Lee, Mi-Ock (Dept. of Korean Food & Culinary Arts, Youngsan University) ;
  • Song, Young-Sun (School of Foods and Life Science, Institute of Basic Sciences, Inje University)
  • 노경희 (인제대학교 식품생명과학부, 기초과학연구소) ;
  • 장지현 (인제대학교 식품생명과학부, 기초과학연구소) ;
  • 민관희 (인제대학교 식품생명과학부, 기초과학연구소) ;
  • 친조리그 라드나바자르 (인제대학교 식품생명과학부, 기초과학연구소) ;
  • 이미옥 (영산대학교 한국식품조리학과) ;
  • 송영선 (인제대학교 식품생명과학부, 기초과학연구소)
  • Received : 2011.02.22
  • Accepted : 2011.03.04
  • Published : 2011.05.31
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Abstract

Green tea seed coat (GTSC) was extracted with 100% ethanol for 4 hr and then fractionated with petroleum ether (PE), ethyl acetate (EtOAC) and butanol (BuOH). The EtOAC fraction showed the highest level in total phenol contents and the lowest level in nitric oxide (NO) production in LPS-stimulated RAW264.7 macrophage cell. Thus, this study was carried out to investigate the anti-inflammatory and its mechanisms of GTSC EtOAC fraction in LPS-stimulated RAW264.7 macrophage cell. GTSC EtOAC fraction contained EGC ($1146.48{\pm}11.01\;{\mu}g/g$), tannic acid ($966.99{\pm}32.24\;{\mu}g/g$), EC ($70.88{\pm}4.39\;{\mu}g/g$), gallic acid ($947.61{\pm}1.03\;{\mu}g/g$), caffeic acid ($37.69{\pm}1.46\;{\mu}g/g$), ECG ($35.46{\pm}3.19\;{\mu}g/g$), and EGCG ($15.53{\pm}0.09\;{\mu}g/g$) when analyzed by HPLC. NO production was significantly (p<0.05) suppressed in a dose-dependent manner with an $IC_{50}$ of $80.11\;{\mu}g$/mL. Also prostaglandin $E_2$ level was also inhibited in a dose-dependent manner. Moreover, iNOS protein expression was suppressed in dose-dependent manner but COX-2 gene expression was not affected. Total antioxidant capacity and glutathione (GSH) levels were enhanced more than the LPS-control. Expressions of antioxidative enzymes including catalase, GSH-reductase and Mn-SOD were elevated compared to LPS-control. Nuclear p65 level was decreased in the GTSC EtOAC fraction in a dose-dependent manner. These results indicate that GTSC EtOAC fraction inhibit oxidative stress and inflammatory responses through elevated GSH levels, antioxidative enzymes expressions and suppression of iNOS expression via NF-${\kappa}B$ down-regulation.

본 연구는 녹차씨껍질 분획 추출물 중 염증 저해능이 강력한 EtOAC분획을 선정하여 대식세포주인 RAW264.7 macrophage cell에서 항염증효과의 기전을 생화학적, 분자학적수준에서 분석하고자 하였다. 녹차씨껍질 추출물 100 mg당 총 페놀함량은 EtOAC분획에서 가장 높은 수준이었으며 EtOH추출물>PE분획>BuOH분획과 $H_2O$분획의 순으로 나타났다. 또한 EtOAC분획의 NO 억제능이 가장 강한 것으로 나타나, EtOAC분획의 polyphenol을 분석한 결과 EGC ($1146.5{\pm}11.01\;{\mu}g/g$)> tannic acid($967.0{\pm}32.24\;{\mu}g/g$)> EC ($70.9{\pm}4.39\;{\mu}g/g$)> gallic acid($947.6{\pm}1.03\;{\mu}g/g$)> caffeic acid($37.7{\pm}1.46\;{\mu}g/g$)> ECG($35.5{\pm}3.19\;{\mu}g/g$)> EGCG($15.5{\pm}0.09\;{\mu}g/g$)의 순으로 나타났다. 녹차씨껍질 EtOAC분획이 RAW264.7 macrophage cell에서 LPS 처리에 의한 산화적 스트레스로 발생되는 NO 생성을 농도 의존적으로 감소시키며($IC_{50}$: $80.11\;{\mu}g/mL$) $PGE_2$의 생성을 억제하였다. 염증생성 전사인자인 iNOS의 유전자 발현은 농도 의존적으로 억제시켰으나 COX-2의 단백질 발현에는 영향을 미치지 않았다. 녹차씨껍질 EtOAC분획은 총 항산화능과 GSH 수준을 증가시켜 산화적 스트레스를 경감시키는 역할을 하며 항산화효소계인 catalase, GSH-red 및 Mn-SOD 활성의 단백질 발현을 증가시키는 것으로 나타났다. 핵에서의 p65 농도는 대조군에 비해 녹차씨껍질 EtOAC분획을 처리한 군에서 현저하게 낮은 것으로 나타났다. 이상의 결과에서, 녹차씨껍질 EtOAC분획은 NF-${\kappa}B$ 활성을 억제함으로써 iNOS 단백질 발현을 억제하여 NO의 생성을 감소시키고 총 항산화능과 GSH 수준을 증가시키며, 항산화 효소계를 활성화시켜 세포내 산화적 스트레스를 감소시킴으로써 LPS 자극에 의한 염증반응을 지연하거나 억제하는 것으로 사료된다.

Keywords

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