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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effects of Catechin on Lipid Composition and Adipose Tissue in Obese Rats Fed High Fat Diet

고지방 식이로 유도된 비만쥐에서 녹차 Catechin이 체지방 조성 및 지방조직에 미치는 영향

  • Rhee, Soon-Jae (Dept. of Food Science and Nutrition, Catholic University of Daegu) ;
  • Kim, Kyung-Ran (Dept. of Food Science and Nutrition, Catholic University of Daegu) ;
  • Kim, Hong-Tae (Dept. of Anatomy, College of Medicine, Catholic University of Daegu) ;
  • Hong, Jung-Hee (Dept. of Food Science and Nutrition, Catholic University of Daegu)
  • 이순재 (대구가톨릭대학교 식품영양학과) ;
  • 김경란 (대구가톨릭대학교 식품영양학과) ;
  • 김홍태 (대구가톨릭대학교 의과대학 해부학교실) ;
  • 홍정희 (대구가톨릭대학교 식품영양학과)
  • Published : 2007.05.30
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Abstract

The current study examined the effects of catechin on lipid composition of serum and liver and adipocyte of epididymal fat pads in obese rats fed high fat diet. Sprague-Dawley male rats weighing $100{\pm}10g$ were randomly divided into eight groups, four normal diet groups and four high fat diet groups according to the level of dietary catechin supplement. The rats were fed ad libitum experimental diets for 4 weeks and then they were sacrificed. Body weight in HF group was heavier than that of NC group, but HFCM and HFCH groups were significantly reduced compared to HF group. Relative body weight to abdominal weight and relative body weight to epididymal weight in HF group were increased to 103% and 106%, respectively, compared to NC group, but HFCM and HFCH groups were significantly reduced as compared to HF group. The levels of serum triglyceride, total cholesterol, LDL-cholesterol and atherogenic index in HFCH groups were significantly lower than those of HF group, whereas HDL-cholesterol levels were increased. Total lipid contents of liver in HF group was significantly higher than that of NC group, but HFCH group maintained the NC level. There were no significant difference in hepatic triglyceride contents of high fat diet groups. Contents of hepatic cholesterol in HF group was 29% higher than that of NC group, but HFCM and HFCH groups were significantly reduced as compared to HF group. Cell number and cell size of epididymal fat pads in HFCM and HFCH groups were significantly reduced, respectively, compared to HF group. Improved lipid metabolism observed in rats fed catechin may be caused by an alteration of number and size in epididymal fat pad and lipid composition.

본 연구에서는 고지방식이 흰쥐에서 녹차 catechin의 체지방 조성 및 지방조직에 미치는 영향을 규명하고자 혈중 및 간조직의 지질조성과 지방조직의 세포 수 및 크기를 관찰하였다. 실험동물은 체중 $100{\pm}10g$내외의 Sprague-Dawley종 흰쥐를 이용하여 catechin의 공급수준에 따라 각각 10마리씩 총 8군으로 나누어 4주간 자유섭식시킨 후 지질대사를 관찰하였다. 체중증가량을 관찰한 결과 HFCM 및 HFCH군에서 HF군에 비해 체중이 유의적으로 감소됨을 관찰할 수 있었다. 단위 체중당 복부지방 및 부고환지방 무게는 NC군에 비해 HF군에서 각각 103%, 106%씩 증가되었으나, HFCM 및 HFCH군은 HF군에 비해 각각 15%, 23% 및 21%, 33%씩 감소되었다. 혈중 중성지방, 총 콜레스테롤, LDL-콜레스테롤 및 동맥경화지수는 HF군에 비해 HFCH군에서 유의적으로 감소되었으나, HDL-콜레스테롤은 증가되었다. 간조직의 총 지방 함량은 NC군에 비해 HF군에서 유의적으로 증가되었으나 HFCH군은 정상식이군 수준이었다. 중성지방 함량은 고지방식이 실험군간의 유의적인 차이는 없었다. 콜레스테롤 함량은 NC군에 비해 HF군은 29% 증가되었으나, HFCM 및 HFCH군은 HF군에 비해 유의적으로 감소되었다. 부고환지방의 세포수 및 세포크기도 HFCM 및 HFCH군이 HF군에 비해 유의적으로 감소되었다. 결론적으로 녹차 catechin은 혈청에서 총콜레스테롤, 중성지방 및 동맥경화지수를 감소시키고 부고환지방의 세포수 및 크기의 감소를 유도하여 비만을 억제시키는 효과가 규명되었다.

Keywords

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