Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Methanol extract of Lespedeza maximowiczii var. tricolor Nakai improves glucose metabolism through PPARγ agonist and insulin-mimetic effect in 3T3-L1 adipocytes and db/db mice

삼색싸리 메탄올 추출물의 3T3-L1지방세포와 db/db 마우스에서의 PPARγ 작용제와 인슐린 유사효과를 통한 혈당조절 개선효과

  • Park, Chul-Min (Environmental Technology Research Institute, Seoul National University of Science and Technology) ;
  • Kim, Hui (Dept. of Oriental Medicine Resources and Institute of Korean Medicine Industry, Mokpo National University) ;
  • Rhyu, Dong-Young (Dept. of Oriental Medicine Resources and Institute of Korean Medicine Industry, Mokpo National University)
  • Received : 2019.09.17
  • Accepted : 2019.11.11
  • Published : 2019.12.31
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Abstract

The aim of this study is to investigate the effect of Lespedeza maximowiczii var. tricolor Nakai (LMTN) on glucose metabolism. LMTN extract significantly enhanced the glucose uptake and lipid accumulation in 3T3-L1 adipocytes compared with control. Also, LMTN extract in 3T3-L1 adipocytes significantly increased the protein expression of peroxisome proliferator-activated receptor (PPAR)γ, insulin receptor substrate-1, and glucose transporter (GLUT)4. The regulatory effect on glucose uptake or insulin signal transduction of LMTM extract was lower than troglitazone or pinitol such as the positive control, but increased PPARγ activation. Additionally, LMTM extract has an insulin-mimetic effect. In db/db mice, LMTN extract (250 mg/kg BW) significantly reduced water and food intake, blood glucose, and level of plasma triglyceride and total cholesterol. Furthermore, the expression of PPARã and GLUT4 mRNA in adipose or muscle tissue effectively was increased by oral treatment of LMTN extract. Thus, our results suggest that LMTN extract improves the glucose metabolism through PPARγ and insulin-mimetic effect in 3T3-L1 adipocytes and db/db mice.

이 연구의 목적은 당 대사에 대한 삼색싸리(Lespedeza maximowiczii var. tricolor Nakai; LMTN)의 효과를 조사하는 것이다. LMTN 추출물은 대조군과 비교하여 3T3-L1 지방 세포에서 당 섭취능 및 지질축적을 유의하게 향상시켰다. 또한, 3T3-L1 지방 세포에서 LMTN 추출물은 퍼옥시좀 증식제 활성화 수용체(PPAR)γ, 인슐린수용체기질-1 (IRS-1) 및 포도당수송체(GLUT)4의 단백질 발현을 유의하게 증가시켰다. LMTM 추출물의 당 섭취능 또는 인슐린 신호 전달계의 조절 효과는 양성 대조물질인 트로글리타존 또는 피니톨보다 낮았지만 PPARγ 단백 활성화는 증가하였다. 또한, LMTM 추출물은 인슐린 유사효과를 나타냈다. db/db 마우스에서, LMTN 추출물(250 mg/kg BW)은 물과 식이 섭취량, 혈당, 중성지방과 총 콜레스테롤 함량을 유의적으로 감소시켰다. 더불어 지방과 근육조직에서의 PPARγ 및 GLUT4 mRNA의 발현도 LMTN 추출물 투여군에서 유의적으로 증가되었다. 따라서, 본 연구의 결과는 LMTN 추출물이 3T3-L1 지방세포 및 db/db 마우스에서 PPARγ 및 인슐린 유사효과를 통해 당 대사를 조절하는 것으로 밝혀졌다.

Keywords

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