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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Hog Millet Supplementation on Hepatic Steatosis and Insulin Resistance in Mice Fed a High-fat Diet

고지방식이로 유도한 지방간 마우스에서 기장 첨가식이가 지방간 및 인슐린 저항성에 미치는 영향

  • Park, Mi-Young (Functional Food & Nutrition Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Jang, Hwan-Hee (Functional Food & Nutrition Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Lee, Jin-Young (Functional Food & Nutrition Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Lee, Young-Min (Functional Food & Nutrition Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Jae-Hyun (Functional Food & Nutrition Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Park, Jae-Hak (College of Veterinary Medicine, Seoul National University) ;
  • Park, Dong-Sik (Functional Food & Nutrition Division, National Academy of Agricultural Science, Rural Development Administration)
  • 박미영 (국립농업과학원 농식품자원부 기능성식품과) ;
  • 장환희 (국립농업과학원 농식품자원부 기능성식품과) ;
  • 이진영 (국립농업과학원 농식품자원부 기능성식품과) ;
  • 이영민 (국립농업과학원 농식품자원부 기능성식품과) ;
  • 김재현 (국립농업과학원 농식품자원부 기능성식품과) ;
  • 박재학 (서울대학교 수의과대학) ;
  • 박동식 (국립농업과학원 농식품자원부 기능성식품과)
  • Received : 2012.01.16
  • Accepted : 2012.03.22
  • Published : 2012.04.30
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Abstract

The dietary intake of whole grains is known to reduce the incidence of chronic diseases such as obesity, diabetes, cardiovascular disease, and cancer. In our previous study, hog millet (HM, $Panicum$ $miliaceum$ L.) water extract showed the highest anti-lipogenic activity among nine cereal types in 3T3-L1 cells. In this study, the effect of hog millet water extract on hepatic steatosis and lipid metabolism in mice fed a high fat diet was investigated. Mice were fed a normal-fat diet (ND), high-fat diet (HFD) or HFD containing 1% or 2% (w/w) HM for 7 weeks. Body weight and food intake were monitored during the study period. Insulin resistance by homeostasis model assessment (HOMA-IR), fasting lipid profile, hepatic fatty acid metabolism-related gene expression determined, and intraperitoneal glucose tolerance test (IGTT) were performed at the study's end. The results indicated that 1% and 2% HM diets effectively decreased liver weights, blood TG and T-cholesterol levels (p<0.05), while the HDL-cholesterol level was increased (p<0.05) compared to HFD-induced steatotsis mice. Hepatic lipogenic-related gene ($PPAR{\alpha}$, L-FABP, and SCD1) expressions decreased, whereas lipolysis- related gene (CPT1) expression increased in animals fed the 2% PME diet (p<0.05). In addition, mice fed 1% or 2% HM diet had markedly decreased IGTT and HOMA-IR, compared to the those of the HFD-induced hepatic steatosis control group (p<0.05). These results indicated that HM inhibited hepatic lipid accumulation by regulating fatty acid metabolism, and suggested that HM is useful in the chemoprevention or treatment of high fat-induced hepatic steatosis and hepatic steatosis-related disorders including hyperlipidemia, glucose sensitivity, and insulin resistance.

비알코올성 지방간은 인슐린저항성을 근간으로 하는 대사증후군의 원인으로 생각되고 있으며 최근 그 발병율이 증가하고 있다. 본 연구진은 기장 열수추출물을 식이에 첨가하여 고지방식에 의해 인위적으로 지방간을 유도한 마우스에게 섭취시킨 후 혈청 내 생물학적 수치와 간조직 검사를 통하여 비알코올성 지방간 억제 효과를 검토하였다. 그 결과, 식이섭취량은 차이가 없었으나 간조직 무게가 1% 및 2% 기장 열수추출물 첨가식이군에서 유의적으로 감소하였고(p<0.05) 간조직 내 지방 축적이 유의적으로 감소하였음을 확인하였다. 또한 기장 열수추출물 첨가식이군의 경우 고지방식 대조군에 비해 혈청 중성지방 및 총 콜레스테롤이 감소하였고(p<0.05), HDL과 HDL-/총 콜레스테롤의 비율이 유의적으로 증가하여(p<0.05) 혈액의 지질 조성이 개선되었음을 알 수 있었다. HOMA-IR 및 포도당 내성 검사 결과 2% 기장 열수추출물 첨가군의 경우 이들 모두 유의적으로 감소하여 고지방식에 의한 인슐린 저항성 및 당흡수 부전을 기장 열수추출물이 완화시켰다(p<0.05). 한편 간조직에서 지방산 대사와 관련된 인자들의 유전자 발현을 측정한 결과 지방산 합성에 관여하는 L-FABP와 SCD1은 2% 기장 열수추출물 섭취군에서 유의적으로 감소하였고(p<0.05) 지방산 산화와 관련된 $PPAR{\alpha}$는 1% 및 2% 기장 열수추출물 섭취군에서 모두 유의적으로 증가하였다(p<0.05). 이상의 혈청 및 조직의 생물학적 수치와 간조직 검사 결과를 미루어 볼 때 기장 열수추출물 첨가 식이는 고지방식이에 의해 유도된 마우스의 비알코올성 지방간 치유 혹은 예방에 긍정적으로 기여할 수 있음을 시사해 준다.

Keywords

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