%0 Electronic Article
%A Gökhan Demirkıran
%A Güleser Kalaycı Demir
%A Cüneyt Güzeliş
%K two-phase dynamics model
%K cancer therapies
%K p53-regulators
%K cell fate decision
%K ATM model
%K Wip1 overexpression
%K P53 network
%K 2D relaxation oscillator model
%K Mdm2 overexpression
%K Wip1 variables
%K Wip1 downregulation
%K cell apoptosis
%K phase space approach
%K gamma irradiation
%K Mdm2 downregulation
%K mutation effects
%K state-dependent delay differential equation
%K Wip1 time delay
%K ATM deficiency
%K excitable relaxation oscillator
%K cell cycle arrest
%X This study proposes a two-dimensional (2D) oscillator model of p53 network, which is derived via reducing the multidimensional two-phase dynamics model into a model of ataxia telangiectasia mutated (ATM) and Wip1 variables, and studies the impact of p53-regulators on cell fate decision. First, the authors identify a 6D core oscillator module, then reduce this module into a 2D oscillator model while preserving the qualitative behaviours. The introduced 2D model is shown to be an excitable relaxation oscillator. This oscillator provides a mechanism that leads diverse modes underpinning cell fate, each corresponding to a cell state. To investigate the effects of p53 inhibitors and the intrinsic time delay of Wip1 on the characteristics of oscillations, they introduce also a delay differential equation version of the 2D oscillator. They observe that the suppression of p53 inhibitors decreases the amplitudes of p53 oscillation, though the suppression increases the sustained level of p53. They identify Wip1 and P53DINP1 as possible targets for cancer therapies considering their impact on the oscillator, supported by biological findings. They model some mutations as critical changes of the phase space characteristics. Possible cancer therapeutic strategies are then proposed for preventing these mutations’ effects using the phase space approach.
%@ 1751-8849
%T Revealing determinants of two-phase dynamics of P53 network under gamma irradiation based on a reduced 2D relaxation oscillator model
%B IET Systems Biology
%D February 2018
%V 12
%N 1
%P 26-38
%I Institution of Engineering and Technology
%U https://digital-library.theiet.org/;jsessionid=h4id449314kgr.x-iet-live-01content/journals/10.1049/iet-syb.2017.0041
%G EN