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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Antigenotoxic and Anticarcinogenic Effects of Styela plicata

오만둥이(Styela plicata)의 항유전독성 및 대장암 억제효과에 관한 연구

  • Seo, Bo-Young (Dept. of Food and Nutrition, Kyungnam University) ;
  • Kim, Jung-Mi (Dept. of Food and Nutrition, Kyungnam University) ;
  • Lee, Seung-Cheol (Dept. of Food Science and Biotechnology, Kyungnam University) ;
  • Park, Eun-Ju (Dept. of Food and Nutrition, Kyungnam University)
  • 서보영 (경남대학교 식품영양학과) ;
  • 김정미 (경남대학교 식품영양학과) ;
  • 이승철 (경남대학교 식품생명공학부) ;
  • 박은주 (경남대학교 식품영양학과)
  • Published : 2009.07.31
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Abstract

Colorectal cancer is the third most common malignant neoplasm in the world. Much attention has been focused on reducing colon cancer risk through medical properties of natural compound that could act as anticarcinogens. In this study, we evaluated the antioxidant and antigenotoxic effects of Styela plicata (S. plicata) from in vitro experiments. S. plicata extracts showed antioxidant activity measured by TRAP assay and antigenotoxic effect in $200{\mu}M$ $H_2O_2$ induced DNA damage in human leukocytes. Especially, freeze-dried S. plicata extracted with methanol showed the highest level of TRAP (0.225 mM) and inhibition of DNA damage (66.8%). Additionally we observed the effect of S. plicata on the formation of aberrant crypt foci (ACF) induced by dimethylhydrazine (DMH) and DMH induced DNA damage (by comet assay) in male SD rats. The animals were divided into three groups and fed high-fat and low fiber diet (100 g lard+20 g cellulose/kg diet) without (normal control and DMH control) or with a 3% (w/w) of lyophilized S. plicata powder (DMH+S. plicata). One week after beginning the diets, rats were treated with DMH (30 mg/kg, s.c.) for 6 weeks except for normal control group, which was treated saline instead; dietary treatments were continued for the entire experiment. Nine weeks after DMH injection, administration of S. plicata resulted in reduction of ACF numbers, to 82.7% of the carcinogen control value ($7.67{\pm}2.04$ vs. $1.33{\pm}0.53$: p<0.01). S. plicata supplementation induced antigenotoxic effect on DMH-induced DNA damage in the blood cell (% tail intensity: $6.79{\pm}0.26$ vs. $6.13{\pm}0.22$). These data indicate that S. plicata extract has antigenotoxic and anticarcinogenic effects from in vitro experiments and S. plicata exerts a protective effect on the process of colon carcinogenesis, possibly by suppressing the DMH-induced DNA damage in blood cell and the development of preneoplastic lesions in colon.

오만둥이는 우리나라의 전통적인 수산식품으로써 찜 또는 찌개류로 조리하여 널리 이용하여 왔다. 본 연구에서는 오만둥이의 기능성 소재로서의 기능적 특성을 파악하기 위하여 오만둥이 추출물의 항산화 활성 및 항유전독성 활성을 in vitro 방법으로 측정하였다. 또한 대장암에 대한 예방효과를 알아보기 위하여 DMH로 대장암을 유발한 SD 쥐를 이용하여 오만둥이를 경구투여한 후 DNA 손상 및 ACF 형성에 미치는 영향을 알아보았다. 그 결과 총항산화능은 모든 추출물에서 대조구에 비해 유의적으로 높은 활성을 나타내었다. 동결건조 한 추출물에서는 메탄올, 에탄올(0.225, 0.219 mM) > 물(0.179 mM) > 아세톤(0.150 mM) 순으로 나타났으며, 신선한 오만둥이에서는 메탄올 추출물(0.215 mM)이 가장 높은 항산화력이 있는 것으로 나타났다. Comet assay에서는 모든 추출물이 $H_2O_2$에 의한 산화적 스트레스에 대항한 DNA 손상억제력을 향상시키는 것으로 나타났으며 특히 동결건조 한 오만둥이에서 메탄올 추출물의 억제력이 가장 높은 것으로 나타났다. 백혈구의 DNA 손상정도는 대조군에 비해 DMH 투여군에서 유의적으로 손상정도가 증가한 반면, DMH+S. placata군에서는 DMH를 주입한 군에 비하여 손상정도가 유의적으로 감소하였다. 또한 ACF의 생성수치가 DMH군에 비하여 DMH+S. placata군에서 유의적으로 감소하는 결과를 나타내었다. 이상의 결과로 미루어 볼 때 오만둥이는 in vitro 뿐만 아니라 대장암을 유발한 쥐에서도 항산화 및 항암효과에 긍정적인 영향을 미치는 것으로 나타나 오만둥이가 대장암을 예방하기 위한 기능성식품 소재로서 가능성을 보여 주었다.

Keywords

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