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Kurarinone promotes TRAIL-induced apoptosis by inhibiting NF-${\kappa}B$-dependent cFLIP expression in HeLa cells

  • Seo, Ok-Won (Vascular Homeostasis Laboratory, Departments of Molecular and Cellular Biochemistry and Institute of Medical Sciences, School of Medicine, Kangwon National University) ;
  • Kim, Jung Hwan (Department of Rehabilitation Medicine, School of Medicine, Kangwon National University and Hospital) ;
  • Lee, Kwang-Soon (Vascular Homeostasis Laboratory, Departments of Molecular and Cellular Biochemistry and Institute of Medical Sciences, School of Medicine, Kangwon National University) ;
  • Lee, Kyu-Sun (Vascular Homeostasis Laboratory, Departments of Molecular and Cellular Biochemistry and Institute of Medical Sciences, School of Medicine, Kangwon National University) ;
  • Kim, Ji-Hee (Vascular Homeostasis Laboratory, Departments of Molecular and Cellular Biochemistry and Institute of Medical Sciences, School of Medicine, Kangwon National University) ;
  • Won, Moo-Ho (Department of Neurobiology, School of Medicine, Kangwon National University) ;
  • Ha, Kwon-Soo (Vascular Homeostasis Laboratory, Departments of Molecular and Cellular Biochemistry and Institute of Medical Sciences, School of Medicine, Kangwon National University) ;
  • Kwon, Young-Guen (Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University) ;
  • Kim, Young-Myeong (Vascular Homeostasis Laboratory, Departments of Molecular and Cellular Biochemistry and Institute of Medical Sciences, School of Medicine, Kangwon National University)
  • Accepted : 2012.08.27
  • Published : 2012.11.30

Abstract

This study was designed to investigate the effects of the prenylated flavonoid kurarinone on TNF-related apoptosis inducing ligand (TRAIL)-induced apoptosis and its underlying mechanism. A low dose of kurarinone had no significant effect on apoptosis, but this compound markedly promoted tumor cell death through elevation of Bid cleavage, cytochrome c release release and caspase activation in HeLa cells treated with TRAIL. Caspase inhibitors inhibited kurarinone-mediated cell death, which indicates that the cytotoxic effect of this compound is mediated by caspase-dependent apoptosis. The cytotoxic effect of kurarinone was not associated with expression levels of Bcl-2 and IAP family proteins, such as Bcl-2, Bcl-$x_L$, Bid, Bad, Bax, XIAP, cIAP-1 and cIAP-2. In addition, this compound did not regulate the death-inducing receptors DR4 and DR5. On the other hand, kurarinone significantly inhibited TRAIL-induced IKK activation, $I{\kappa}B$ degradation and nuclear translocation of NF-${\kappa}B$, as well as effectively suppressed cellular FLICE-inhibitory protein long form ($cFLIP_L$) expression. The synergistic effects of kurarinone on TRAIL-induced apoptosis were mimicked when kurarinone was replaced by the NF-${\kappa}B$ inhibitor withaferin A or following siRNA-mediated knockdown of $cFLIP_L$. Moreover, cFLIP overexpression effectively antagonized kurarinone-mediated TRAIL sensitization. These data suggest that kurarinone sensitizes TRAIL-induced tumor cell apoptosis via suppression of NF-${\kappa}B$-dependent cFLIP expression, indicating that this compound can be used as an anti-tumor agent in combination with TRAIL.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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