Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Inhibitory Role of TRIP-Br1/XIAP in Necroptosis under Nutrient/Serum Starvation

  • Sandag, Zolzaya (Department of Biological Science, Sookmyung Women's University) ;
  • Jung, Samil (Department of Biological Science, Sookmyung Women's University) ;
  • Quynh, Nguyen Thi Ngoc (Department of Biological Science, Sookmyung Women's University) ;
  • Myagmarjav, Davaajargal (Department of Biological Science, Sookmyung Women's University) ;
  • Anh, Nguyen Hai (Department of Biological Science, Sookmyung Women's University) ;
  • Le, Dan-Diem Thi (Department of Biological Science, Sookmyung Women's University) ;
  • Lee, Beom Suk (Department of Biological Science, Sookmyung Women's University) ;
  • Mongre, Raj Kumar (Department of Biological Science, Sookmyung Women's University) ;
  • Jo, Taeyeon (Department of Biological Science, Sookmyung Women's University) ;
  • Lee, MyeongSok (Department of Biological Science, Sookmyung Women's University)
  • Received : 2019.08.27
  • Accepted : 2020.01.02
  • Published : 2020.03.31
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Abstract

Currently, many available anti-cancer therapies are targeting apoptosis. However, many cancer cells have acquired resistance to apoptosis. To overcome this problem, simultaneous induction of other types of programmed cell death in addition to apoptosis of cancer cells might be an attractive strategy. For this purpose, we initially investigated the inhibitory role of TRIP-Br1/XIAP in necroptosis, a regulated form of necrosis, under nutrient/serum starvation. Our data showed that necroptosis was significantly induced in all tested 9 different types of cancer cell lines in response to prolonged serum starvation. Among them, necroptosis was induced at a relatively lower level in MCF-7 breast cancer line that was highly resistant to apoptosis than that in other cancer cell lines. Interestingly, TRIP-Br1 oncogenic protein level was found to be very high in this cell line. Up-regulated TRIP-Br1 suppressed necroptosis by repressing reactive oxygen species generation. Such suppression of necroptosis was greatly enhanced by XIAP, a potent inhibitor of apoptosis. Our data also showed that TRIP-Br1 increased XIAP phosphorylation at serine87, an active form of XIAP. Our mitochondrial fractionation data revealed that TRIP-Br1 protein level was greatly increased in the mitochondria upon serum starvation. It suppressed the export of CypD, a vital regulator in mitochondria-mediated necroptosis, from mitochondria to cytosol. TRIP-Br1 also suppressed shikonin-mediated necroptosis, but not TNF-α-mediated necroptosis, implying possible presence of another signaling pathway in necroptosis. Taken together, our results suggest that TRIP-Br1/XIAP can function as onco-proteins by suppressing necroptosis of cancer cells under nutrient/serum starvation.

Keywords

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