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인체 백혈병세포에서 매실 추출물에 의한 apoptosis 유도

Apoptosis Induction by Methanol Extract of Prunus mume Fruits in Human Leukemia U937 Cells

  • 정유정 (동의대학교 한의과대학 생화학교실 및 한의학연구소) ;
  • 박철 (동의대학교 한의과대학 생화학교실 및 한의학연구소) ;
  • 정영기 (동아대학교 생명공학과 및 대학원 의생명과학과) ;
  • 최영현 (동의대학교 한의과대학 생화학교실 및 한의학연구소)
  • Chung, You-Jeong (Department of Biochemistry, Research Institute of Oriental Medicine, Dongeui University College of Oriental Medicine) ;
  • Park, Cheol (Department of Biochemistry, Research Institute of Oriental Medicine, Dongeui University College of Oriental Medicine) ;
  • Jeong, Yong-Kee (Department of Medical Bioscience, Graduate School and Department of Biotechnology, College of Natural Resources and Life Science, Dong-A University) ;
  • Choi, Yung-Hyun (Department of Biochemistry, Research Institute of Oriental Medicine, Dongeui University College of Oriental Medicine)
  • 투고 : 2011.03.19
  • 심사 : 2011.03.24
  • 발행 : 2011.08.30

초록

예로부터 한국, 일본 및 중국에서 민간처방 약재 및 건강식품으로 사용되어온 매실은 다양한 효능을 가지는 것으로 알려져 있으나 인체 암세포에서 유발하는 항암작용 및 그에 따른 분자생물학적 기작에 대해서는 명확히 밝혀져 있지 않다. 본 연구에서는 인체 혈구암 U937 세포에서 매실의 메탄올 추출물(MEPM)이 유발하는 항암효과 및 항암기전을 조사한 결과, MEPM 처리 농도 의존적으로 암세포의 성장억제 및 apoptosis를 유발하는 것으로 나타났다. MEPM에 의해서 유발되는 apoptosis에는 XIAP 및 survivin 등과 같은 IAP family의 발현 감소와 더불어 FasL의 발현 증가, Bcl-2의 발현 감소 및 Bid의 단편화 현상이 관여하는 것으로 나타났으며, 두 가지 apoptosis 유발 개시 및 최종 apoptosis 단계에서 중요한 역할을 하는 caspase-8과 -9 및 -3의 활성화와 그에 따른 다양한 기질단백질의 발현 감소 및 단편화가 동반되었음을 알 수 있었다. 또한 인위적인 caspase-3의 활성 차단으로 MEPM에 의하여 유발되는 apoptosis가 현저하게 억제되는 것으로 나타났다. 이상의 결과에서 MEPM은 암세포의 chemotherapeutic agent로서의 가능성을 확인하였지만 향후 지속적인 연구를 통하여 활성물질의 동정 및 관련 기전의 비교 등이 지속적으로 이루어져야 할 것으로 생각된다.

In the present study, the pro-apoptotic effects of methanol extract of Prunus mume fruits (MEPM) in human leukemia U937 cells were investigated. It was found that exposure to MEPM resulted in growth inhibition in a concentration-dependent manner by inducing apoptosis. The induction of apoptotic cell death in U937 cells by MEPM was correlated with a down-regulation of inhibitor of apoptosis protein (IAP) family, such as X-linked inhibitor of apoptosis protein (XIAP) and survivin, anti-apoptotic Bcl-2, up-regulation of FasL and cleavage of Bid. MEPM treatment also induced the proteolytic activation of caspase-3, caspase-8 and caspase-9, and degradation of caspase-3 substrate proteins, such as poly (ADP-ribose) polymerase (PARP) and ${\beta}$-catenin. In addition, apoptotic cell death induced by MEPM was significantly inhibited by z-DEVD-fmk, a caspase-3 specific inhibitor, which demonstrates the important role of caspase-3 in the apoptotic process by MEPM in U937 cells. Taken together, these findings suggest that P. mume extracts may be a potential chemotherapeutic agent for the control of human leukemia cells and further studies will be needed to identify the active compounds.

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