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 Opuntia ficus-indica on Lipid Metabolism in the db/db Mouse

노팔 복합물이 II형 당뇨생쥐에서 지질대사에 미치는 효과

  • Yoon, Jin A (Dept. of Food and Nutrition, Baewha Women's University)
  • 윤진아 (배화여자대학교 식품영양과)
  • Received : 2012.11.08
  • Accepted : 2013.05.08
  • Published : 2013.06.30
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Abstract

This study investigated the effects of Opuntia ficus-indica and other natural resources (OF) in db/db and C57 mice. Plasma triglycerides, cholesterol, alanine aminotransferase (ALT) activity, aspartate aminotransferase (AST) activity, fecal bile acid excretion, the histopathological appearance of the liver, and cholesterol-related mRNA expression were determined. Mice (12 db/db mice and 12 C57 mice) were assigned to diabetic-control (db-C), diabetic-OF treatment (db-OF), normal-control (C57-C), and normal-OF treatment (C57-OF) groups. Animals in the control group were fed an AIN-76 recommended diet and animals in the OF group were fed an experimental diet containing 5% of OF for 4 weeks. Concentrations of total plasma cholesterol, triglyceride, low density lipoprotein (LDL)-cholesterol, and very low density lipoprotein (VLDL)-cholesterol decreased with the administration of OF. In contrast, high density lipoprotein (HDL)-cholesterol levels were minimally affected by the experimental diet. Plasma AST and ALT showed lower activities in the db-OF group, and the fecal excretion of bile acid was reduced in the db-OF group. Histopathological analysis of the liver showed that fatty liver conditions in the db-OF group were more improved than db-C. Low-density lipoprotein receptor (LDL-R) and cholesterol 7${\alpha}$-hydroxylase (CYP7A1) mRNA expression were increased in the db-OF group as well. However, 3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMG-CoA-R) mRNA expression was lower in the db-OF group. These results provide experimental evidence about improved lipid metabolism of the OF feeding in the db/db mice.

유전적으로 제2형 당뇨병이 유발되는 db/db 생쥐에 OF를 5% 수준으로 4주간 급여한 결과 지방 대사를 개선시켜, 혈장 총콜레스테롤, LDL-콜레스테롤, VLDL-콜레스테롤과 중성지방을 유의적으로(p<0.05) 감소시켰고, HDL-콜레스테롤은 유의적인 차이를 보이지 않았다. 혈장 총콜레스테롤의 감소는 간에서 HMG-CoA-R의 감소에 의한 콜레스테롤의 생성이 줄어든 것이고, 또한 콜레스테롤을 담즙산으로 합성하는 CYP7A1을 증가시켜 콜레스테롤을 담즙산의 형태로 배설시켰기 때문이다. 이 결과 분변 중 담즙산의 함량이 증가하였다. LDL-콜레스테롤의 감소는 LDL-콜레스테롤을 세포로 이동시켜 분해를 촉진하는 LDL-R의 증가로 확인할 수 있었다. db/db mice에서는 비만뿐 아니라 심각한 지방간이 유발되는데 OF의 급여로 AST와 ALT를 낮추어 간세포의 파괴를 완화시켰으며, 간 조직의 H&E 염색 소견에서도 지방간의 완화를 확인할 수 있었다. 또한 대조군으로 C57 생쥐에게 5% 수준으로 OF를 급여한 결과 OF를 급여하지 않은 대조군과 OF를 급여한 실험군의 혈장 중성지방, 총 콜레스테롤, HDL-콜레스테롤, LDL-콜레스테롤, VLDL-콜레스테롤, AST와 ALT 함량의 차이가 없었으며, 간조직 관찰에서도 차이를 나타내지 않았다. 이상의 결과를 종합할 때, OF는 당뇨병이 유발되지 않은 정상혈당의 생쥐에서는 지질대사에 아무런 영향을 주지 않았으며, 제2형 당뇨병인 db/db mice의 당뇨병 합병증인 지질대사 이상을 개선하는데 효과가 있는 것으로 사료되며, OF의 어떤 성분이 이와 같은 효과를 나타냈는지 보다 구체적인 성분 분석과 세부적인 연구를 통한 확인이 필요하다고 사료된다.

Keywords

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