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Study on cell apoptosis based on bifurcation and sensitivity analysis

Department of Mathematics, Shanghai University, Shanghai 200444, P. R. China

Special Issues: Computational models in life sciences

Apoptosis plays critical roles in embryonic development and adult tissue homeostasis. It has been shown that several feedback loops regulate the intrinsic pathway of apoptosis. However, it remains elusive how they coordinately modulate apoptosis. For the three modules (initiator, amplifier, and executioner) of the intrinsic pathway, we mainly studied dynamics of the initiator and the executioner modules. In this paper, we aimed to identify important regulatory processes in apoptosis through bifurcation and single-parameter sensitivity analysis. We found that modules or feedback loops but not specific parameters determine the network functions. More exactly, the activity of BH3 plays a more important role in the initiator module and triggers the amplifier module. In addition, aC9 autocrine expression and C9/XIAP feedback loop are more sensitive in executioner module. We also found that three feedback loops respectively including BH3AC/BH3DR, MDM2/ARF/ASPP and p53helper/p53killer play more important roles in cell fate decisions after DNA damage. Our research provides a rational basis for the design of clinical trials of anticancer drugs.
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© 2019 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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