Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Induction of Quinone Reductase and Glutathion S-transferase in Hepatoma Cells by Citrus aurantium Linn (Jikak) Produced in Cheju Island

지각 추출물이 quinone reductase 및 glutathion s-transferase의 유도활성에 미치는 영향

  • Yu, Mi-Hee (Department of Food Science and Technology, School of Natural Science, Keimyung University) ;
  • Lee, In-Seon (The Center for Traditional Microorganism Resources, Keimyung University)
  • 유미희 (계명대학교 식품가공학 전공) ;
  • 이인선 (계명대학교 전통미생물자원개발 및 산업화연구(TMR) 센터)
  • Published : 2005.04.30
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Abstract

Phase II enzymes are transcriptionally induced by synthetic chemical agents and natural products, and such induction plays critical roles in protection against chemical carcinogens and other toxic xenobiotics. To discover natural products for use as cancer chemopreventive agents, the ability of Citrus aurantium Linn (Jikak) to induce activities of quinone reductase (QR) and glutathione S-transferase (GST) in wild-type murine hepatoma cell line (Hepa 1c1c7) and Ah-receptor-defective mutant of the same cell line (Bprcl) was investigated. Hexane and chloroform fractions of C. aurantium Linn (Jikak) at doses not exhibiting cytotoxicity were effective inducers of QR (${\sim}1.8-fold$) and GST (${\sim}1.5-fold$) in Hepa 1c1c7 cells, whereas showed low QR induction potency in Bprcl cells, which indicates they have weak monofunctional action. Results suggest C. aurantium Linn (Jikak) as potentially useful cancer chemopteventive agent.

Phase II 효소계는 자연계에 존재하는 다양한 화학물질과 천연소재들에 의해 유도되며, 이들의 유도는 화학적 발암물질과 그 밖의 여러 가지 독성물질들로부터 생체를 보호하는데 중요한 역할을 한다. 특히, phase II 효소 중 QR은 quinone류 자체에 대한 보호효과가 있고 다른 암예방 효소계와 공통으로 유도되며, 항암 작용이 있는 많은 화합물에 의해 유도되어지기 때문에 암예방 물질 탐색의 지표가 되는 대표적인 효소로 많이 이용된다. 본 연구에서는 제주도에서 자생하는 귤류 중 지각을 이용하여 메탄올추출물을 제조한 후 대표적인 암예방계 효소로 알려진 quinone reductase 및 glutathion S-transferase의 유도 활성을 조사하였다. 우선 QR 및 GST 유도활성 측정에 앞서 각 시료의 Hepa 1c1c7 세포에 대한 독성을 조사하여 시료자체의 세포독성을 관찰하였으며, 이 결과를 바탕으로 QR, GST 유도 활성을 측정할 시 세포독성을 거의 나타내지 않는 각각 시료의 최대 처리 농도를 결정하였다. 총 6개의 지각 분획물 중 mouse 유래 Hepa 1c1c7 세포주에서는 hexane 충과 chloroform 충에서 QR, GST의 활성이 $200{\mu}g/mL$에서 각각 1.8배, 1.5배 이상으로 증가되어 높은 QR 및 GST의 유도활성을 보였다. 따라서 지각의 hexane 층이나 chloroform층에 존재하는 높은 QR및 GST의 유도활성이 나타나는 물질을 분리 정제하여 앞으로 계속적인 연구가 진행되어야 할 것이다.

Keywords

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