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홍삼 사포닌 분획의 Nrf2 Keap1 신호전달체계 조절을 통한 지방축적 및 활성산소종 억제효과

Red ginseng-derived saponin fraction inhibits lipid accumulation and reactive oxygen species production by activating nuclear factor (erythroid-derived 2)-like 2 (Nrf2)/Kelch-like ECH-associated protein 1 (Keap1) pathway

  • 김채영 (고려대학교 보건과학대 의생명융합과학과) ;
  • 강보빈 (고려대학교 보건과학대 의생명융합과학과) ;
  • 황지수 (고려대학교 보건과학대 의생명융합과학과) ;
  • 최현선 (서울여자대학교 식품공학과)
  • Kim, Chae-Young (Department of Integrated Biomedical and Life Science, Graduate School, Korea University) ;
  • Kang, Bobin (Department of Integrated Biomedical and Life Science, Graduate School, Korea University) ;
  • Hwang, Jisu (Department of Integrated Biomedical and Life Science, Graduate School, Korea University) ;
  • Choi, Hyeon-Son (Department of Food Science and Technology, College of Natural Science, Seoul Women's University)
  • 투고 : 2018.09.18
  • 심사 : 2018.11.28
  • 발행 : 2018.12.31

초록

본 연구에서는 홍삼 사포닌 분획(SF)으로부터 진세노사이드의 조성을 분석하고 지방세포의 분화 및 지방축적에 대한 효과를 측정하였다. SF는 지방분화인자인 $PPAR{\gamma}$, $C/EBP{\alpha}$의 단백질 양을 억제함으로써 지방분화 동안 효과적으로 지방축적을 억제하였으며 주로 지방분화 초기시점부터 지방분화 초기인자인 $C/EBP{\beta}$, KLF2의 조절작용을 통해 지방축적을 억제하는 것으로 관찰되었다. SF는 또한 지방분화 동안 생성되는 ROS의 생성을 효과적으로 억제하였는데 이는 SF가 산화방지 시스템인 Nrf2/Keap1 경로를 활성화하기 때문으로 판단되며 특히 Nrf2의 핵 내로의 진입을 활성화 함으로써 Nrf2의 타겟 산화방지 분자들인 HO-1, NQO1의 발현을 촉진하였다. 이는 지방분화 동안 SF의 지방축적 억제 효과가 Nrf2의 활성화와 밀접하게 관련이 있음을 보여준다.

This study aimed to investigate the effects of red ginseng-derived saponin fraction (SF) on lipid accumulation, reactive oxygen species (ROS) production, and nuclear factor (erythroid-derived 2)-like 2 (Nrf2)/Kelch-like ECH-associated protein 1 (Keap1) signaling during adipocyte differentiation. SF effectively inhibited lipid accumulation, with the downregulation of adipogenic factors such as peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$) and CCAAT/enhancer-binding protein alpha ($C/EBP{\alpha}$). A high dose of SF decreased the protein levels of $PPAR{\gamma}$ and $C/EBP{\alpha}$ by over 90% compared to the control. SF-mediated downregulation of adipogenic factors was due to the regulation of early adipogenic factors including $C/EBP{\beta}$ and $Kr{\ddot{u}}ppel$-like Factor 2 (KLF2). In addition, SF ($200{\mu}g/mg$) decreased intracellular ROS generation by 40% during adipocyte differentiation. However, the SF significantly upregulated Nrf2 and its target proteins, hemoxygenase-1 (HO-1) and NADPH dehydrogenase quinone 1 (NQO1). Furthermore, SF ($200{\mu}g/mg$) promoted the nuclear translocation of Nrf2. The SF-mediated reduction of lipid accumulation was associated with the regulation of the Nrf2/Keap1 pathway.

키워드

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Fig. 1. Effect of saponin fraction (SF) on viability of 3T3-L1 cells.

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Fig. 2. Effect of saponin fraction (SF) on lipid accumulation during adipocyte differentiation.

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Fig. 3. Effect of saponin fraction (SF) on adipogenic stages.

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Fig. 5. Effect of saponin fraction (SF) on the production of ROS in 3T3-L1 cells.

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Fig. 6. Effect of saponin fraction (SF) on the protein expression level of Nrf2, Keap1, HO-1 and NQO1, and Nrf2 nuclear translocation in 3T3-L1 cells.

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Fig. 7. Effect of saponin fraction (SF) on the protein expression level of AKT, P-AKT in 3T3-L1 cells.

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Fig. 4. Effect of saponin fraction (SF) on early adipogenic factors.

Table 1. Ginsenoside composition from saponin fraction

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Table 2. Radical scavenging activity of saponin fraction

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