Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Quercetin Sensitizes Human Leukemic Cells to TRAIL-induced Apoptosis: Involvement of DNA-PK/Akt Signal Transduction Pathway

Quercetin 에 의한 사람백혈병 세포의 TRAIL 에 대한 감수성 증가: DNA-PK/Akt 신호전달경로의 관여

  • Park, Jun-Ik (Department of Biochemistry, Pusan National University School of Medicine) ;
  • Kim, Mi-Ju (Department of Biochemistry, Pusan National University School of Medicine) ;
  • Kim, Hak-Bong (Department of Biochemistry, Pusan National University School of Medicine) ;
  • Bae, Jae-Ho (Department of Biochemistry, Pusan National University School of Medicine) ;
  • Lee, Jea-Won (Department of Biochemistry, Pusan National University School of Medicine) ;
  • Park, Soo-Jung (Division of Intractable Diseases, Center for Biomedical Sciences, National Institute of Health) ;
  • Kim, Dong-Wan (Department of Microbiology, College of Natural Sciences, Chang Won National University) ;
  • Kang, Chi-Dug (Department of Biochemistry, Pusan National University School of Medicine) ;
  • Kim, Sun-Hee (Department of Biochemistry, Pusan National University School of Medicine)
  • 박준익 (부산대학교 의학전문대학원 생화학교실) ;
  • 김미주 (부산대학교 의학전문대학원 생화학교실) ;
  • 김학봉 (부산대학교 의학전문대학원 생화학교실) ;
  • 배재호 (부산대학교 의학전문대학원 생화학교실) ;
  • 이재원 (부산대학교 의학전문대학원 생화학교실) ;
  • 박수정 (국립보건원 만성질환연구부) ;
  • 김동완 (창원대학교자연과학대학 미생물학과) ;
  • 강치덕 (부산대학교 의학전문대학원 생화학교실) ;
  • 김선희 (부산대학교 의학전문대학원 생화학교실)
  • Published : 2009.08.30
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Abstract

Despite the fact that many cancer cells are sensitive to TNF-related apoptosis-inducing ligand (TRAIL)-induced apoptosis, some cancer cells show either partial or complete resistance to TRAIL. Human leukemic K562 and CEM cells also show resistance to TRAIL-induced apoptosis. Novel molecular target and treatment strategies are required to overcome TRAIL resistance of human leukemia cells. Therefore, the purpose of this study was to target key anti-apoptotic molecules deciding TRAIL resistance for sensitization of TRAIL-resistant K562 and CEM cells, and to evaluate the effect of quercetin as a TRAIL sensitizer on these TRAIL-resistant cells. We found that quercetin acted in synergy with TRAIL to enhance TRAIL-induced apoptosis in K562 cells by inhibition of the DNA-PK/Akt signaling pathway, which leads to enhancement of TRAIL-mediated activation of caspases and concurrent cleavage of PARP and up-regulation of Bax. The findings suggest that the DNA-PK/Akt signaling pathway plays an essential role in regulating cells to escape from TRAIL-induced apoptosis, and quercetin could act in synergy with TRAIL to increase apoptosis by inhibition of the DNA-PK/Akt signaling pathway, which overcomes TRAIL-resistance of K562 and CEM cells. This study suggests that DNA-PK might interfere with TRAIL-induced apoptosis in human leukemic cells through activation of the Akt signaling pathway.

TNF-related apoptosis-inducing ligand (TRAIL) 는 암세포에만 작용하고 정상세포에는 영향을 주지 않는 항암제로서 알려져 있지만, TRAIL에 내성을 나타내는 암세포의 출현이 문제점으로 지적되고 있다. 사람 백혈병세포인 K562 및 CEM 세포는 TRAIL에 내성을 나타낸다. 본 연구에서는 이러한 백혈병 세포의 TRAIL 내성에 대한 새로운 표적 분자의 발굴과 이를 토대로 한 새로운 내성극복 방법을 연구하였다. 새로운 TRAIL sensitizer로서 quercetin을 발굴하고, 이를 K562 세포에 TRAIL과 병용 투여하므로서 TRAIL의 효과 증강에 의한 내성극복을 시도하였다. Quercetin은 DNA-PK/Akt 신호전달경로를 억제하므로서, caspases 활성 증강과 PARP cleavage, 이에 따른 Bax의 발현을 증강시키는 기전으로 K562 세포의 TRAIL에 의한 apoptosis를 증대시키는 활성이 있음을 밝혔다. 이러한 quercetin 병용 처리에 의한 TRAIL의 활성 증강으로 TRAIL 내성이 극복됨을 CEM 세포에서도 확인하였다. 이러한 연구 결과는 DNA-PK 발현 증강에 의한 Akt의 활성화가 TRAIL 내성을 유발하는 기전을 토대로 함을 밝힘으로써, DNA-PK 활성 억제제를 TRAIL과 병용하므로서 TRAIL 내성을 나타내는 암세포에 내성 극복 효과를 얻을 수 있는 새로운 약제 병용 방법을 제시하였다.

Keywords

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