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Effects of Unripened Cheese Supplements on Lipid and Antioxidant Status in Hypercholesterolemic SD Rats

고콜레스테롤혈증 흰쥐에서 비숙성치즈의 보충섭취가 지질 및 항산화 체계에 미치는 영향

  • Seo, Bo-Young (Dept. of Food and Nutrition, Kyungnam University) ;
  • Spengler, Bernhard (Institute for Inorganic and Analytical Chemistry, Justus-Liebig University) ;
  • Rompp, Andreas (Institute for Inorganic and Analytical Chemistry, Justus-Liebig University) ;
  • Schober, Yvonne (Institute for Inorganic and Analytical Chemistry, Justus-Liebig University) ;
  • Yoon, Yoe-Chang (Dept. of Food Science and Biotechnology of Animal Resources, Konkuk University) ;
  • Park, Eun-Ju (Dept. of Food and Nutrition, Kyungnam University)
  • Received : 2011.10.11
  • Accepted : 2011.12.10
  • Published : 2012.01.31

Abstract

The aim of this study was to evaluate the effects of unripened cheese supplements on lipid metabolism and antioxidant status in hypercholesterolemic SD rats. Rats were induced to have hypercholesterolemia by feeding them high cholesterol diet (0.5% cholesterol and 0.2% sodium cholate) for 4 weeks and then divided into 2 groups. One group was fed a high cholesterol diet with 5% unripened cheese (URC) daily for 6 weeks, and the other one was fed a high cholesterol diet without 5% unripened cheese (URC) daily for 6 weeks. Significantly-increased plasma total cholesterol (TC), triglycerides (TG), and AST activity because of the high-cholesterol diet were reduced 18.8%, 40.5%, and 33%, respectively, by URC supplementation. Also, URC lowered hepatic total lipids, TCs, and TGs, whereas fecal lipid profiles were not changed by URC. The supplementation of URC resulted in an increase of plasma retinol and ${\alpha}$-tocopherol by 40.5% and 39.2% and leukoytic DNA resistance to oxidative stress by 52.3% compared to hypercholesterolemic control. These results suggest that unripened cheese supplements could exert significant health benefits to those with hypercholesterolemia through ameliorating lipid profiles and antioxidant effects.

본 연구에서는 식이로 유도한 고콜레스테롤혈증 흰쥐에 비숙성치즈를 보충 투여하였을 때 간과 혈액 내 지질상태 및 항산화 상태의 변화를 분석하고자 하였다. 정상대조군을 제외한 나머지 그룹은 4주간 고콜레스테롤 식이섭취를 통해 고콜레스테롤혈증을 유발한 뒤 고콜레스테롤식이 및 고콜레스테롤 식이+비숙성치즈 첨가식이를 6주간 더 투여하였다. 실험기간 중 평균 식이섭취량은 그룹 간 유의적 차이를 보이지 않은 반면, 체중 변화량과 식이효율은 다른 군에 비해 비숙성치즈섭취군에서 유의적으로 낮게 나타났다. 정상대조군에 비해 고콜레스테롤혈증대조군에서 간 무게, 혈장총콜레스테롤, 중성지방농도 및 혈장 AST 활성이 유의적으로 높게 나타났으며 비숙성치즈섭취군에서는 고콜레스테롤 혈증대조군에 비해 감소하는 효과를 보였다. 고콜레스테롤 식이에 의해 유의적으로 증가한 간조직의 총 지질함량, 중성 지방과 총콜레스테롤의 농도도 비숙성치즈 보충섭취에 의해 유의적으로 감소하였다. 분변의 지질성분에는 비숙성치즈 보충섭취에 따른 영향은 없었다. 혈장 retinol과 ${\gamma}$-tocopherol, ${\alpha}$-tocopherol 농도는 정상대조군에 비해 고콜레스테롤혈증대조군에서 낮은 경향을 나타내었으나 유의적차이는 없었으며, 비숙성치즈 보충섭취 후 혈장 retinol, ${\alpha}$-tocopherol의 농도는 유의적으로 증가하였다. 고콜레스테롤혈증 유발 식이는 산화적 스트레스에 대한 백혈구 DNA손상을 유의적으로 증가시킨 것으로 나타난 반면, 비숙성치즈의 보충섭취는 이를 52.3% 감소시켰다. 이상 본 연구의 결과, 고콜레스테롤혈증을 유발한 동물모델에서 비숙성치즈의 보충섭취는 지질대사 개선 및 항산화 상태 개선에 효과적이라는 것을 확인할 수 있었다. 향후 본 연구를 기반으로한 분자생물학적 수준의 기전 연구가 필요하다고 생각되어지며 비숙성치즈의 지질개선 및 항산화 효과 등의 기능성식품 소재로의 활용이 기대된다.

Keywords

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