생명과학회지 (Journal of Life Science)

  • 제21권7호
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  • Pages.1046-1051
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  • 2011
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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인간 간암세포주 HepG2에서 heme oxygenase-1 발현에 대한 diallyl disulfide의 효과

Effect of Diallyl Disulfide on Heme Oxygenase-1 Expression in Human Hepatoma Cell Line HepG2

  • 김강미 (부산대학교 의학전문대학원 미생물학 및 면역학교실) ;
  • 이상권 (양산부산대학교병원 심혈관센터) ;
  • 박영철 (부산대학교 의학전문대학원 미생물학 및 면역학교실)
  • Kim, Kang-Mi (Department of Microbiology & Immunology, Pusan National University School of Medicine) ;
  • Lee, Sang-Kwon (Cardiovascular Center, Pusan National University Yangsan Hospital) ;
  • Park, Young-Chul (Department of Microbiology & Immunology, Pusan National University School of Medicine)
  • 투고 : 2011.06.10
  • 심사 : 2011.07.15
  • 발행 : 2011.07.30
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초록

Dially disulfide (DADS)는 마늘의 주요한 유기 황화합물 성분으로서 다양한 약리 작용을 나타낸다. 최근 DADS가 항염증과 항동맥경화 작용뿐만 아니라 암세포의 증식을 억제하고 사멸을 유도한다는 보고가 이어지고 있고, 이에 관련된 연구가 활발히 진행되고 있는 실정이다. 한편, DADS가 세포 내 항산화 인자인 glutathione을 증가시킨다는 연구결과와 세포 내 항산화 효소의 일종인 HO-1의 발현을 직접 유도한다는 결과가 보고되었다. 그래서, 본 연구에서는 논란이 되고 있는 DADS의 세포 내 항산화 효소인 HO-1의 발현에서의 효과 및 그 전사인자들의 작용에 관여하는지를 인간 간암세포주 HepG2에서 조사하였다. 배양 중인 HepG2 세포에서 DADS는 독성이 없는 농도에서 세포의 증식을 크게 억제하였고, 전사인자 Nrf2의 발현을 약하게 유도하였으나 HO-1의 발현에는 영향을 미치지 못하는 것으로 나타났다. 또한, DADS는 HO-1 유도제인 CoPP와 hemin에 의해 자극된 HepG2 세포의 HO-1 발현의 증가를 단백질 수준에서 강력하게 억제시키는 것으로 나타났다. 그러나 DADS는 CoPP에 의한 HO-1 유전자의 mRNA 수준의 전사에는 억제 효과를 보이지 않았으며, 또한 Nrf2와 small Maf의 발현을 증가시키고 핵 내에 축적시키는 것으로 나타났다. 이를 종합해 볼 때 DADS는 단독으로 HO-1 발현을 유도하지 못하고, HO-1 유도제에 의한 HO-1 유전자의 발현과정에서는 전사단계가 아닌 번역단계에서 역할을 함으로써 HO-1의 단백질 합성을 억제하는 것으로 보인다. 결론적으로, 항산화 효소인 HO-1의 활성은 외부 자극으로부터 세포를 보호하고 사멸에 저항하게 하는데, DADS는 인간 간암세포주 HepG2에서 이 효소의 발현을 억제함으로써 항암제 및 redox 변화에 따른 암세포주의 성장을 억제하고 세포사멸을 촉진시킬 수 있다고 여겨진다.

Diallyl disulfide (DADS), the most prevalent oil-soluble organosulfur compound in garlic, is known to have diverse biological activities, including anticarcinogenic, antiatherosclerotic, antiinflammatory, and antioxidant actions. In this study, we investigated the effect of DADS on the expression of heme oxygenase-1 (HO-1) in human liver hepatoma cell line HepG2. Treatment of HepG2 cells by DADS evoked a dose-dependent growth inhibition without significant toxicity to the cells, and also induced the expression of transcription factor Nrf2. However, DADS did not have any enhancing effect on transcription and translation of HO-1 expression in HepG2 cells. In addition, DADS efficiently blocked protein synthesis of HO-1 in HepG2 cells stimulated by CoPP or hemin. But, DADS did not decrease the content of transcripts of HO-1 gene stimulated by CoPP, with accumulation of Nrf2 and small Maf in the nucleus. Based on these results, we conclude that DADS inhibits HO-1 expression by modulation of translational level of CoPP or hemin-induced HO-1 expression in HepG2 cells.

키워드

참고문헌

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