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Antioxidant and anti-inflammatory activity of extracts from red beet (Beta vulagaris) root

레드 비트 뿌리 추출물의 항산화 및 항염증 효과

  • Yi, Mi-Ran (Biotechnology Regional Innovation Center, Jeju National University) ;
  • Kang, Chang-Hee (Biotechnology Regional Innovation Center, Jeju National University) ;
  • Bu, Hee-Jung (Biotechnology Regional Innovation Center, Jeju National University)
  • 이미란 (제주대학교 생명과학기술혁신센터) ;
  • 강창희 (제주대학교 생명과학기술혁신센터) ;
  • 부희정 (제주대학교 생명과학기술혁신센터)
  • Received : 2017.03.29
  • Accepted : 2017.05.11
  • Published : 2017.06.30

Abstract

This study was designed to examine the in vitro antioxidant and anti-inflammatory effects of red beet (Beta vulagaris) root. Red beet root was extracted using 70% ethanol and then fractionated sequentially with n-hexane, ethyl acetate and butanol. Antioxidative ability was evaluated by bioassays using total polyphenol contents and ABTS (2,2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid diammonium salt) radical scavenging activity. Ethyl acetate fraction of red beet root was best on total polyphenol contents ($37.02{\pm}0.37mg\;GAE/g$) and ABTS radical scavenging effects ($IC_{50}$ $42.9{\pm}9.5{\mu}g/mL$). For the anti-inflammatory activity in RAW264.7 cells, the hexane fraction showed the highest inflammatory effect. Dose response studies were performed to determine the inhibitory effect of hexane fraction of red beet root on pro-inflammatory mediators in lipopolysaccharide (LPS)-stimulated RAW264.7 cells. The hexane fraction of red beet root inhibited the NO and $PGE_2$ production and the protein level of iNOS and COX-2, and protein expression of pro-inflammatory cytokines ($TNF-{\alpha}$, IL-6 and $IL-1{\beta}$), in a dose-dependent manner. These results suggest that red beet root has considerable potential as a functional food ingredient with antioxidative and anti-inflammatory effects.

본 연구는 제주도에서 재배된 레드 비트(B. vulagaris) 뿌리의 항산화 및 항염 효과를 알아보기 위하여 70% EtOH 추출물과 순차적 용매 분획물들을 확보하여 총폴리페놀 함량 및 ABTS 라디칼 소거 활성 측정을 통한 항산화 효능평가와 대식세포인 RAW264.7 세포에 LPS를 자극한 후 iNOS/NO, $COX-2/PGE_2$ 및 전염증성 cytokine을 유도하여 염증 억제 효과를 알아보았다. 그 결과, 총 폴리페놀이 37.02 mg GAE/g로 가장 높게 나온 EtOAc 분획물이 라디칼 소거활성도 가장 우수하게 나타났으며($IC_{50}$ $42.9{\mu}g/mL$), 대조군으로 사용한 BHT($IC_{50}$ $57.4{\mu}g/mL$)보다 좋은 활성을 보였다. 항염 활성 분석을 위하여 NO/iNOS, $PGE_2/COX-2$, 및 염증성 cytokine($TNF-{\alpha}$, IL-6, $IL-1{\beta}$)의 생성 억제 효능을 분석한 결과, 총 폴리페놀 함량 결과와는 유의적이지 않게 hexane 분획물이 처리 농도 범위(50, 100, 200, $300{\mu}g/mL$)에서 NO/iNOS, $PGE_2/COX-2$, 및 염증성 cytokine 생성을 유의적으로 억제하였다. iNOS와 COX-2 단백질 발현 억제 효과를 통해 NO와 $PGE_2$ 생성 억제에 영향을 끼치고 있음을 확인하였고, 염증성 cytokine 중에는 IL-6의 생성을 가장 강하게 억제함으로써 전체적으로 항염 활성에 영향을 미치고 있음을 확인할 수 있었다. 이러한 결과들로부터 레드비트 뿌리의 EtOAc 분획물에서의 항산화 효능 확인과 hexane 분획물의 세포내 항염 효과를 알 수 있었으며, 향후 유효 물질 동정을 통한 기전 연구를 하는 데 대한 기초자료로 활용할 수 있을 것이라 사료된다.

Keywords

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