Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Induction of Apoptosis by Combined-treatment with Genistein and TRAIL in U937 Human Leukemia Cells

Genistein과 TRAIL의 복합처리에 의한 U937 인체 혈구암 세포의 Apoptosis 유도

  • Choi, Yung-Hyun (Department of Biochemistry, College of Oriental Medicine, Department of Biomaterial Control (BK21 Program), Graduate School, Blue-Bio Industry Regional Innovation Center, Dongeui University) ;
  • Han, Min-Ho (Department of Biochemistry, College of Oriental Medicine, Department of Biomaterial Control (BK21 Program), Graduate School, Blue-Bio Industry Regional Innovation Center, Dongeui University)
  • 최영현 (동의대학교 한의과대학 생화학교실, 대학원 바이오물질제어학과(BK21 program) 및 블루바이오소재개발센터) ;
  • 한민호 (동의대학교 한의과대학 생화학교실, 대학원 바이오물질제어학과(BK21 program) 및 블루바이오소재개발센터)
  • Received : 2011.06.30
  • Accepted : 2011.08.02
  • Published : 2011.09.30
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Abstract

Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) has been proposed as a potent tool to trigger apoptosis in cancer therapy. However, as many types of cancer cells remain resistant towards TRAIL-induced cytotoxicity, several combined therapy approaches aimed to sensitize cells to TRAIL have been developed. Genistein, a natural isoflavonoid phytoestrogen, has been shown to have anticancer activity by inducing cell cycle arrest at G2M phase as well as apoptosis in various cancer cell lines. In the present study, we showed that treatment with TRAIL in combination with subtoxic concentrations of genistein sensitized U937 human leukemia cells to TRAIL-mediated apoptosis. Combined treatment with genistein and TRAIL effectively activated caspases through Bid truncation (tBid) and down-regulation of cellular caspase-8 (FLICE)-like inhibitory proteinL ($cFLIP_L$). However, the apoptotic effects of co-treatment with genistein and TRAIL were significantly inhibited by specific caspase inhibitors, which demonstrates the important role of caspases in apoptosis induced by genistein and TRAIL. Overall, our results indicate that genistein can potentiate TRAIL-induced apoptosis through down-regulation of $cFLIP_L$ and up-regulation of pro-apoptotic tBid proteins.

TRAIL은 최근 암세포의 apoptosis 유도를 위한 효율적인 도구로 제시되었으나 많은 암세포들이 TRAIL 저항성을 획득한 것으로 알려져 TRAIL 저항성 극복을 위한 새로운 방법론의 제시가 요구되어지고 있다. Genistein은 대두의 대표적인 생리활성 물질인 isoflavonoid의 일종으로 많은 암세포에서 G2/M arrest를 유발하면서 apoptosis를 유도하는 것으로 알려져 있다. 본 연구에서는 U937 인체백혈병세포를 대상으로 genistein에 의한 TRAIL 유도 apoptosis의 감수성 증대 여부를 조사하였다. 본 연구의 결과에 의하면 U937 세포에서 세포독성이 없는 범위의 genistein 처리는 TRAIL에 의한 apoptosis 유도를 매우 증진시켰으며, 이는 tBid의 발현 증가와 cFLIPL의 발현 감소와 연계된 caspase의 활성 증가와 연관성이 있었다. 또한 caspase의 활성 저해제는 genistein과 TRAIL의 복합처리에 의한 apoptosis를 유의적으로 감소시켜 복합 처리에 의한 apoptosis의 유도에 caspase의 활성 증대가 필수적임을 알 수 있었다. 따라서 genistein은 TRAIL 저항성을 획득한 암세포의 효율적인 combined therapy approach를 위해 유용하게 사용될 수 있음을 알 수 있었다.

Keywords

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