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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Inhibition of Type II Diabetes in ob/ob Mice and Enhancement of Mitochodrial Biogenesis in C2C12 Myotubes by Korean Mistletoe Extract

한국산 겨우살이 추출물(KME)의 2형 당뇨 억제 및 근육세포 미토콘드리아 생성 증가 효과

  • Jung, Hoe-Yune (Department of Life Science, Handong Global University) ;
  • Yoo, Yung Choon (Department of Microbiology, College of Medicine, Konyang University) ;
  • Kim, Inbo (Department of Life Science, Handong Global University) ;
  • Sung, Nak Yun (Department of Microbiology, College of Medicine, Konyang University) ;
  • Choi, Ok-Byung (Department of Bioindustry, Hoseo University) ;
  • Choi, Bo-Hwa (Pohang Center for Evaluation of Biomaterials) ;
  • Kim, Jong-Bae (Department of Life Science, Handong Global University)
  • 정회윤 (한동대학교 생명과학과) ;
  • 유영춘 (건양대학교 의과대학 미생물학교실) ;
  • 김인보 (한동대학교 생명과학과) ;
  • 성낙윤 (건양대학교 의과대학 미생물학교실) ;
  • 최옥병 (호서대학교 바이오산업학부) ;
  • 최보화 (포항테크노파크 바이오소재평가센터) ;
  • 김종배 (한동대학교 생명과학과)
  • Received : 2014.11.12
  • Accepted : 2015.01.31
  • Published : 2015.03.31
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Abstract

In this study, the anti-diabetic activity of a cold water extract of Korean mistletoe (KME) was investigated in C57BL/6J Lep ob (ob/ob) mice. Oral administration of KME (50 or 100 mg/kg/d) significantly inhibited the level of blood glucose of ob/ob mice after 5 days from the beginning of KME treatment. And the anti-diabetic effect of KME was stabilized 10 days after oral administration, showing a substantial reduction of blood glucose levels by more than 20% as compared with control mice. The results of oral glucose tolerance test (OGTT) revealed that oral administration of KME gave rise to a remarkable improvement in overall glucose response. Oral administration of KME in ob/ob diabetic mice also significantly reduced blood total cholesterol (TCHO) and triglyceride (TG) levels compared with the diabetic control mice. Moreover, in an in vitro experiment using C2C12 myotubes, treatment of KME prominently increased glucose uptake. Interestingly, KME significantly increased the expression of peroxisome proliferator-activated receptor gamma coactivator 1-${\alpha}$ ($PGC-1{\alpha}$), a head regulator of mitochondrial biogenesis and oxidative metabolism, and $PGC-1{\alpha}$-associated genes such as glucose transporter type 4 (GLUT4), estrogen-related receptor-${\alpha}$ ($ERR-{\alpha}$), nuclear respiratory factor-1 (NRF-1), and mitochondrial transcription factor A (TmfA) in C2C12 cells. These results suggest that KME has potential as a novel therapeutic agent for diabetes, and its anti-diabetic activity may be related to the regulation of mitochondrial biogenesis.

본 연구에서는 C57BL/6J ob/ob 마우스를 이용하여 한국산 겨우살이 냉수 추출물(KME)의 항당뇨 활성을 조사하였다. 50 혹은 100 mg/kg의 KME를 1일 1회씩 경구투여 한 결과 KME 투여 개시 5일 후부터 ob/ob 마우스의 혈당이 유의하게 억제되었으며, 10일 후부터 안정된 억제 효과를 나타내고 대조군에 비해 20% 이상의 혈당강하 효과를 나타내었다. 경구 당부하 실험(OGTT)에서는 KME 경구투여 마우스에서 유효한 당부하 억제 활성이 관찰되었다. 또한 KME 경구 투여는 ob/ob 당뇨 마우스의 혈액 내 총 콜레스테롤과 중성 지질의 농도를 억제하는 것으로 나타났다. 한편 C2C12 근육세포를 이용한 in vitro 실험에서 KME를 처리함으로써 glucose uptake가 현저히 증가하였다. 한편 매우 흥미롭게도 KME를 처리한 C2C12 근육세포에 있어서 미토콘드리아 생성과 산화대사 조절물질인 peroxisome proliferator-activated receptor gamma coactivator 1-${\alpha}(PGC-1{\alpha})$를 비롯하여 glucose transporter type 4(GLUT4), estrogen-related receptor-${\alpha}(ERR-{\alpha})$, nuclear respiratory factor-1(NRF-1) 그리고 mitochondrial transcription factor A(TmfA)와 같은 $PGC-1{\alpha}$ 관련 유전자들의 발현이 증가하는 것으로 확인되었다. 이 결과는 KME가 2형 당뇨에 대한 치료물질로서의 작용을 지니며 이러한 KME의 항당뇨 활성은 미토콘드리아 생성의 조절과 관련 있는 것으로 추정된다.

Keywords

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