A trigger model of apoptosis induced by tumor necrosis factor signaling
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  • 作者:Chang Gu (1)
    Junjie Zhang (2)
    Yingyu Chen (3) (4)
    Jinzhi Lei (5)
  • 刊名:BMC Systems Biology
  • 出版年:2011
  • 出版时间:December 2011
  • 年:2011
  • 卷:5
  • 期:1-supp
  • 全文大小:364KB
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  • 作者单位:Chang Gu (1)
    Junjie Zhang (2)
    Yingyu Chen (3) (4)
    Jinzhi Lei (5)

    1. School of Mathematical Sciences, Peking University, Beijing, 100871, China
    2. The Key Laboratory for Cell Proliferation and Regulation Biology of Ministry of Education, Institute of Cell Biology, College of Life Sciences, Beijing Normal University, Beijing, 100875, China
    3. Laboratory of Medical Immunology, School of Basic Medical Science, Health Science Center, Peking University, 38 Xueyuan Road, Beijing, 100083, China
    4. Center for Human Disease Genomics, Peking University, 38 Xueyuan Road, Beijing, 100083, China
    5. Zhou Pei-Yuan Center for Applied Mathematics, Tsinghua University, Beijing, 100084, China
文摘
Background The ability of living cells to respond appropriately to apoptosis signals is crucial for the proper development and homeostasis of multicellular organisms. For example, viable cells must be stable enough to appropriately respond to apoptosis signaling so that an irreversible death program is only induced when apoptosis signaling reaches a certain threshold. Previous studies have introduced bistability models in which signaling by caspase-3 activity represents a key regulator of cell fate in response to apoptosis stimuli. Results In this study, apoptosis induced by tumor necrosis factor (TNF) signaling is investigated, and a mathematical model without the requirement for bistability is proposed. In this model, rapid degradation of the active forms of caspases -8 and -3 are included, and TNF-signaling is found to induce a pulse of caspase-3 activation and trigger an irreversible death program. This result agrees with experimental observations. The ability of a cell to respond to, or resist, apoptosis stimuli is also discussed. Furthermore, the activation efficiencies of caspases -8 and -3 that are essential to a cell’s response to extracellular apoptosis stimuli are defined. Based on the simulations performed, it is observed that activation efficiencies must be sufficiently sensitive to appropriately compromise a cell’s resistance and effectiveness in response to apoptosis stimuli. Conclusions Our results suggest that bistability may not be a necessary condition for the induction of apoptosis by TNF signaling. Rather, a sharp increase in caspase-3 activity might be sufficient to trigger the induction of an irreversible death program. Accordingly, regulation of caspase activity and degradation of active caspases is essential for a cell’s response to apoptosis stimuli.

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