생명과학회지 (Journal of Life Science)

한국생명과학회 (Korean Society of Life Science)
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Etoposide에 의한 인간 망막색소상피세포인 ARPE-19 세포의 아폽토시스 과정에서 Heme oxygenase-1의 항아폽토시스 기능에 대한 연구

Anti-apoptotic Activity of Heme Oxygenase-1 Up-regulated by Etoposide in Human Retinal Pigment Epithelial Cells

  • 이상권 (부산대학교 의학전문대학원 흉부외과학교실 및 의학연구소) ;
  • 송주동 (부산대학교 의학전문대학원 미생물학 및 면역학교실) ;
  • 김강미 (부산대학교 의학전문대학원 미생물학 및 면역학교실) ;
  • 김종민 (동아대학교 의과대학 해부학교실) ;
  • 이상률 (부산대학교 의학전문대학원 생화학교실) ;
  • 유영현 (동아대학교 의과대학 해부학교실) ;
  • 박영철 (부산대학교 의학전문대학원 미생물학 및 면역학교실)
  • Lee, Sang-Kwon (Department of Cardiovascular Surgery and Medical Research Institute, Pusan National University School of Medicine) ;
  • Song, Ju-Dong (Department of Microbiology & Immunology, Pusan National University School of Medicine) ;
  • Kim, Kang-Mi (Department of Microbiology & Immunology, Pusan National University School of Medicine) ;
  • Kim, Jong-Min (Department of Anatomy and Cell Biology, Dong-A University School of Medicine) ;
  • Lee, Sang-Yull (Department of Biochemistry, Pusan National University School of Medicine) ;
  • Yoo, Young-Hyun (Department of Anatomy and Cell Biology, Dong-A University School of Medicine) ;
  • Park, Young-Chul (Department of Microbiology & Immunology, Pusan National University School of Medicine)
  • 발행 : 2007.09.30
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초록

Totopoisomerase II 저해제인 etoposide는 핵안에 DNA double strand breaks를 일으키므로써 세포의 DNA에 손상을 초래한다. 본 연구에서는 인간 망막색소상피세포인 ARPE-19 세포에서의 세포성장 및 아폽토시스에서 etoposide의 역할을 살펴보았다. Etoposide는 세포의 성장을 크게 감소시켰으며 TUNEL에서 아폽토시스를 나타내는 DNA fragmentation의 증가를 유도하였다. 게다가, etoposide는 산화적 손상에 대해 세포나 조직을 보호하는 역할을 하는 것으로 알려진 세포내 항산화효소인 heme oxygenase-1 (HO-1)의 발현을 크게 증가시켰다. Etoposide에 의한 HO-1 발현증가는 항산화물질 NAC에 의해 억제되었는데, 이는 etoposide에 의한 세포내 ROS의 증가가 HO-1 발현에 중요한 역할을 한다는 것을 의미한다. 또한 HO-1 발현을 억제하기 위하여 HO-1 siRNA 방법을 사용하였다. 흥미롭게도, HO-1 유전자의 knock-down은 etoposide에 의해 유도되는 DNA fragmentation의 정도를 증가시켰다. 이들 결과를 종합해볼 때, etoposide에 의해 자극되어진 ARPE-19 세포에서 발현증가된 HO-1은 etoposide에 의한 아폽토시스 유발과정에서 세포를 보호하는 항아폽토시스의 기능을 한다는 것을 시사한다.

The topoisomerase II inhibitor etoposide causes an accumulation of DNA double strand breaks within the nuclei of cells. In this study, we investigated the effect of etoposide on the cell growth and apoptosis of human RPE cells. Etoposide evoked a significant inhibition of cell growth, and also induced DNA fragmentation in ARPE-19 cells. In addition, etoposide significantly up-regulated the expression of heme oxygenase-1 (HO-1), which is a stress-responsive protein and is known to play a protective role against the oxidative injury. And, etoposide-induced HO-1 expression was affected by the ROS scavenger N-acetyl cysteine. We also used oligonucleotides interfering with HO-1 mRNA (siRNA) for the inhibition of HO-1 expression. Interestingly, knock-down of the HO-1 gene significantly increased the level of DNA fragmentation in etoposide-treated ARPE-19 cells. In conclusion, these results suggest that up-regulated HO-1 plays as an anti-apoptotic factor in the process of apoptosis of ARPE-19 cells stimulated by etoposide.

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참고문헌

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