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 Fractions from Benincasa hispida on Inhibition of Adipogenesis in 3T3-L1 Preadipocytes

동과 분획물이 3T3-L1 지방세포 분화 억제에 미치는 영향

  • You, Yang-Hee (Dept. Food and Nutrition, and Human Ecology Research Institute, Chonnam National University) ;
  • Jun, Woo-Jin (Dept. Food and Nutrition, and Human Ecology Research Institute, Chonnam National University)
  • 유양희 (전남대학교 식품영양학과, 생활과학연구소) ;
  • 전우진 (전남대학교 식품영양학과, 생활과학연구소)
  • Received : 2012.05.02
  • Accepted : 2012.06.02
  • Published : 2012.07.31
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Abstract

The effects of three fractions, hexane (BHHH), chloroform (BHHC), and ethyl acetate (BHHE), from water extract of Benincasa hispida on the underlying mechanisms of adipogenesis were investigated in 3T3-L1 cells. Intracellular lipid droplets were stained with Oil Red O dye and quantified. Compared to control, lipid accumulation significantly decreased by 11% and 13% upon treatment with BHHC and BHHE, respectively at a concentration of 50 ${\mu}g/mL$. Intracellular triglyceride (TG) levels were also reduced by 21% and 16%, respectively, at the same concentration. To determine the mechanism behind the reductions in TG content and lipid accumulation, glycerol release and expression levels of adipogenic marker genes were measured. The levels of free glycerol released into culture medium increased by 13% and 17% upon treatment with BHHC and BHHE, respectively. In subsequent measurements using real-time polymerization chain reaction, the mRNA levels of $PPAR{\gamma}$, C/$EBP{\alpha}$, and leptin significantly decreased upon treatment with BHHE (45%, 67%, and 35%) in comparison with non-treated control. These results suggest that BHHE inhibits adipocyte differentiation by blocking $PPAR{\gamma}$, C/$EBP{\alpha}$, and leptin gene expression in 3T3-L1 cells, resulting in reduced lipid accumulation, increased glycerol release, and intracellular triglycerides.

본 연구에서 동과 물추출물의 계통분획을 통해 획득된 세가지 분획물인 핵산 분획(BHHH), 클로로포름 분획(BHHC), 에틸아세테이트 분획(BHHE)들을 3T3-L1 분화과정 중에 처리한 후, Oil Red O 염색법에 의한 lipid accumulation, 지방구내 triglyceride 함량을 평가하고, free glycerol release 함량과 adipogenesis와 관련된 transcription factor들의 발현 함량을 비교하여 동과 물추출물 중 anti-adipogenesis 활성 분획물을 밝히고, 이 분획물의 작용 메커니즘을 규명하고자 하였다. 50 ${\mu}g/mL$ 농도의 BHHC와 BHHE의 처리는 분화된 지방세포 내 지질 축척을 11%와 13%로 낮추었다. 지방세포 내 중성지방(TG)의 함량은 동일 농도의 각 분획물에서 21%와 16%로 낮게 나타났다. TG 함량의 감소와 지방구내 지질 축적의 감소, 즉 anti-adipogenesis 메커니즘을 밝히기 위해 free glycerol 분비량을 평가하였다. 동일 농도의 BHHC와 BHHE에서 각각 13%와 17% 감소되어 나타났다. BHHC와 BHHE는 세포가 분화하는 동안 $PPAR{\gamma}$, C/$EBP{\alpha}$, leptin의 mRNA 발현을 억제하는 것으로 나타났다. 특히 BHHE의 경우 각 transcriptional factor들의 발현을 45%, 67%, 35%로 현저히 억제시키는 우수한 anti-adipogenetic 소재로 나타났다. 이에 BHHE는 항비만 기능성 소재로 활용될 수 있을 것으로 판단된다.

Keywords

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