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 Eriobotrya japonica Lindl. (Loquat) Leaf Ethanol Extract on Cholesterol and Antioxidative Activity in Rats Fed a High-Fat/High-Cholesterol Diet

비파잎 에탄올 추출물이 고지방-고콜레스테롤 식이를 급여한 흰쥐의 콜레스테롤 저하 및 항산화 활성에 미치는 영향

  • Received : 2011.02.01
  • Accepted : 2011.04.26
  • Published : 2011.05.31
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Abstract

We investigated the effects of an ethanol extract of Eriobotrya japonica Lindl. (loquat) leaves (EJ) on the lipid metabolism of serum, liver, and adipose tissue, and antioxidative activity in rats fed a fat/cholesterol diet for four weeks. Male Sprague-Dawley rats weighing 207 g were divided into 4 groups: a normal diet group (N), a high-fat/high-cholesterol diet group (HFC), a high-fat/high-cholesterol diet group administered 200 mg/kg day EJ (HFC-EJL), and a high-fat/high-cholesterol diet group administered 400 mg/kg/day EJ (HFC-EJH). The serum ALT and AST activities of the EJ groups were lower than those of HFC group, but there was no significant change in serum ALP or LDH activities. The serum total and LDL-cholesterol, atherogenic index, and cardiac risk factor tended to be decreased in the EJ groups compared to the HFC group, while the serum HDL-cholesterol decreased in the HFC group and increased only minimally in the EJ groups. The total cholesterol in liver and mesenteric adipose tissues was lower in the EJ groups than in the HFC group. Triglycerides in the mesenteric and epididymal adipose tissues were lower in the EJ groups than in the HFC group. The liver GSH levels of the EJ groups were significantly lower than the HFC group. The liver TBARS content was significantly lower in the EJ groups than in the HFC group. These results suggest that EJ ethanol extract may improve the lipid metabolism of serum, liver, and adipose tissue and prevent oxidative stress by stimulating antioxidative systems in rats fed a high-fat/high-cholesterol diet.

본 연구는 비파잎 에탄올 추출물의 혈청, 간 및 지방조직의 체내 지질대사 개선 및 항산화 효능을 살펴보기 위하여 5주령 된 흰쥐 수컷 32마리를 1주일 간 적응시킨 후 정상식이군(N), 고지방-고콜레스테롤 식이군(HFC), 고지방-고콜레스테롤 식이와 비파잎 에탄올 추출물 저용량(200 mg/kg/day) 병합투여군(HFC-EJL) 및 고지방-고콜레스테롤 식이군과 비파잎 에탄올 추출물 고용량(400 mg/kg/day) 병합투여군(HFC-EJH)으로 나누어 4주간 실시하였다. 고지방-고콜레스테롤 식이로 인하여 증가된 체중증가량은 비파잎 에탄올 추출물 투여로 유의차는 없었지만 다소 감소하는 경향이었다. 식이섭취량은 실험군 간의 유의차가 없었으나, 식이효율은 고지방-고콜레스테롤 식이군들(HFC, HFC-EJL, HFCEJH)이 정상식이군(N)에 비하여 증가하였다. 고지방-고콜레스테롤 식이로 증가되어진 간조직 및 부고환 지방조직의 무게는 비파잎 에탄올 추출물 투여로 유의하게 감소되었으며, 장간막지방조직 무게도 비파잎 에탄올 추출물 투여로 유의하게 감소하여 정상식이군(N)과 비슷한 경향을 보였다. 혈청 중 ALT 및 AST 활성도 고지방-고콜레스테롤 식이군(HFC)에 비하여 비파잎 에탄올 추출물 병합 투여로 유의하게 감소하였으나, ALP와 LDH 활성에는 영향을 미치지 않았다. 혈청 중 중성지방 함량의 경우 고지방-고콜레스테롤 식이군 간에 유의차는 없었다. 고지방-고콜레스테롤 식이로 증가된 혈청 중 총콜레스테롤과 LDL-콜레스테롤 함량, 동맥경화지수와 심혈관위험지수는 비파잎 에탄올 추출물 투여로 유의하게 저하되었다. 간조직 중 중성지방의 함량은 실험군 간의 유의차가 나타나지 않았으나, 총콜레스테롤 함량은 비파잎 에탄올 추출물 고용량 병합 투여로 유의하게 감소하였다. 장간막지방조직과 부고환지방조직 중 중성지방 함량은 비파잎 에탄올 추출물 투여로 유의하게 감소하여 정상식이군(N)과 비슷한 경향이었으나 장간막지방조직과 부고환지방조직 중 총콜레스테롤 함량에는 유의차가 없었다. 고지방-고콜레스테롤 식이로 감소되어진 간조직 중 GSH 함량은 비파잎 에탄올 투여로 유의하게 증가하였으며, 증가되어진 과산화지질 함량은 유의하게 감소하였다. 이상의 실험 결과 고지방-고콜레스테롤 식이와 비파잎 에탄올 추출물을 병용투여 한 흰쥐의 간 및 지방조직의 무게 감소와 더불어 혈청 및 지방조직의 지질대사 개선에 긍정적인 영향을 미치는 것으로 나타났다. 이러한 결과는 비파잎에 함유된 polyphenol과 flavonoid 등 생리활성 물질에 의해 지방조직의 체지방 형성을 억제하고, 산화적 스트레스를 완화시킴으로써 체내 지질대사 개선과 심혈관계질환 예방 효과를 나타낼 수 있을 것으로 생각되어지나, 이외의 성분이 어떻게 이상지질혈증 및 산화적 스트레스를 억제시킬 수 있는지는 추후 생화학적인 작용기전 등이 더 연구되어야 할 것으로 사료된다.

Keywords

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