Body-Weight-Loss and Cholesterol-Lowering Effects of Cheonggukjang (a Fermented Soybean Paste) Given to Rats Fed a High-Fat/High-Cholesterol Diet

청국장이 고지방-고콜레스테롤식이를 급여한 흰쥐에서 체중감소 및 콜레스테롤 저하효과

  • Kim, Ah-Ra (Department of Food and Nutrition, Chosun University) ;
  • Lee, Jae-Joon (Department of Food and Nutrition, Chosun University) ;
  • Lee, Hwan (Department of Food and Nutrition, Chosun University) ;
  • Chang, Hae-Choon (Department of Food and Nutrition, Chosun University) ;
  • Lee, Myung-Yul (Department of Food and Nutrition, Chosun University)
  • 김아라 (조선대학교 식품영양학과) ;
  • 이재준 (조선대학교 식품영양학과) ;
  • 이환 (조선대학교 식품영양학과) ;
  • 장해춘 (조선대학교 식품영양학과) ;
  • 이명렬 (조선대학교 식품영양학과)
  • Received : 2010.04.13
  • Accepted : 2010.09.24
  • Published : 2010.10.30

Abstract

We investigated the cholesterol-lowering and body-weight loss effects of Cheonggukjang fermented using Bacillus subtilis DJI in rats fed a high-fat/high-cholesterol diet for 4 weeks. Weight-matched male Sprague-Dawley rats were assigned to one of four groups: a normal diet group (N), a high-fat/high-cholesterol diet group (HFC), a high-fat/high-cholesterol diet with DJI Cheonggukjang group (HFC-SCK), and a high-fat/high-cholesterol with commercial Cheonggukjang group (HFC-CCK). All of body weight and liver and adipose tissue weights increased in animals fed a high-fat/high-cholesterol diet, but decreased significantly in rats fed Cheonggukjang powder, compared with the HFC group. Food intake was lower in the HFC group than in the N group, and that of the HFC-CCK group was the lowest among the four groups. Serum total cholesterol levels were significantly lower in the Cheonggukjang-powder fed groups than the other groups. Serum phospholipid and HDL-cholesterol concentrations were significantly decreased in HFC animals and were markedly increased upon feeding of a Cheonggukjang-containing-diet. Levels of serum LDL-cholesterol, the atherogenic index, and cardiac risk factor assessment indications tended to be decreased in Cheonggukjang powder-fed groups, compared with the HFC group. The total cholesterol level in liver tissue was increased by feeding of a high-fat/high-cholesterol diet, and was significantly reduced when Cheonggukjang powder was present in the diet. The levels of total lipids and triglycerides in adipose tissues were lower in the HFC-SCK group than in the HFC group, whereas no significant differences were evidence when the HFC and the HFC-CCK groups were compared. Fecal weight, moisture level, and total lipid content increased in animals fed Cheonggukjang powder. The activities of HR-LPL and TE-LPL in adipose tissues were increased in the HFC group compared with the Cheonggukjang powder-fed groups. These results indicate that dietary Cheonggukjang may improve lipid metabolism and prevent obesity and hyperlipidemia.

고지방-고콜레스테롤식이로 고콜레스테롤혈증 및 비만이 유도된 흰쥐에서 청국장 분말 투여가 비만억제 및 지질 대사 개선에 미치는 영향을 조사하고자 정상군(N), 대조군(HFC), 고지방-콜레스테롤과 DJI 청국장식이군(HFC-SCK), 고지방-고콜레스테롤과 시판청국장 식이군(HFC-CCK)으로 4군으로 나누어 4주간 실시하였다. 체중증가량은 고지방-고콜레스테롤식이로 증가되었고 청국장 분말의 급여로 저하되었다. 식이섭취량은 고지방-고콜레스테롤식이군들이 정상군에 비하여 저하되었으며, 시판청국장 식이군이 가장 낮았다. 식이효율은 정상군이 가장 낮았으며 고지방-고콜레스테롤식이군들 간에는 유의차가 없었다. 간과 지방조직의 무게는 고콜레스테롤혈증을 유발한 대조군이 가장 높았고 청국장 분말 급여로 유의하게 저하되어 정상군과 비슷한 경향이었다. 고지방-고콜레스테롤식이로 증가된 혈청 중 중성지방의 함량은 DJI 청국장 분말의 급여로 유의하게 저하되어 정상군과 유사한 경향이었으나 시판청국장 분말의 급여는 영향을 미치지 않았다. 혈청 중 총콜레스테롤 함량도 청국장식이군에서 유의하게 저하되었으며, 인지질 함량은 대조군이 가장 낮았고 청국장 분말의 급여로 증가하였으며 DJI 청국장군이 가장 높았다. 고지방-고콜레스테롤식이로 증가된 LDL-콜레스테롤, 심혈관위험지수 및 동맥경화지수는 청국장 분말 급여로 감소되었고 감소된 HDL-콜레스테롤의 함량은 증가하였다. 간, 부고환 및 장간막지방조직 중 총지질과 중성지방 함량은 DJI 청국장의 급여로 낮아졌으나 시판청국장 급여 시에는 영향을 미치지 않았고, 간 조직 중 총콜레스테롤 함량은 청국장 분말 급여로 유의하게 저하되었으며 정상군과 비슷한 경향이었다. 변의 배설량, 수분 함량 및 총지질 배설량은 대조군에 비하여 청국장식이군들이 유의하게 증가하였다. 변의 배설량, 수분 함량 및 총지질 배설량은 청국장식이군들 모두 유의하게 저하되었고, 장간막지방조직 중 HR-LPL과 TE-LPL 활성은 DJI 청국장군에서는 두 효소 활성 모두 유의하게 저하되었으나 시판청국장군에서는 TE-LPL 활성만 저하되었다. 본 연구 결과 고지방-고콜레스테롤식이에 청국장 분말을 함께 급여한 결과 체중, 간 및 지방조직의 무게 감소와 지질대사 개선효과를 보였고 LPL 활성을 저하시켜 청국장이 비만과 고지혈증의 예방효과가 있을 것으로 사료되며, 시판청국장에 비하여 DJI 청국장의 지질대사 개선효과가 큰 것으로 나타났다

Keywords

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