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Lyapunov exponents and phase diagrams reveal multi-factorial control over TRAIL-induced apoptosis.

ABSTRACT: Receptor-mediated apoptosis proceeds via two pathways: one requiring only a cascade of initiator and effector caspases (type I behavior) and the second requiring an initiator-effector caspase cascade and mitochondrial outer membrane permeabilization (type II behavior). Here, we investigate factors controlling type I versus II phenotypes by performing Lyapunov exponent analysis of an ODE-based model of cell death. The resulting phase diagrams predict that the ratio of XIAP to pro-caspase-3 concentrations plays a key regulatory role: type I behavior predominates when the ratio is low and type II behavior when the ratio is high. Cell-to-cell variability in phenotype is observed when the ratio is close to the type I versus II boundary. By positioning multiple tumor cell lines on the phase diagram we confirm these predictions. We also extend phase space analysis to mutations affecting the rate of caspase-3 ubiquitylation by XIAP, predicting and showing that such mutations abolish all-or-none control over activation of effector caspases. Thus, phase diagrams derived from Lyapunov exponent analysis represent a means to study multi-factorial control over a complex biochemical pathway.

SUBMITTER: Aldridge BB

PROVIDER: S-EPMC3261706 | biostudies-literature | 2011 Nov

REPOSITORIES: biostudies-literature

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Lyapunov exponents and phase diagrams reveal multi-factorial control over TRAIL-induced apoptosis.

Aldridge Bree B BB Gaudet Suzanne S Lauffenburger Douglas A DA Sorger Peter K PK

Molecular systems biology 20111122

Receptor-mediated apoptosis proceeds via two pathways: one requiring only a cascade of initiator and effector caspases (type I behavior) and the second requiring an initiator-effector caspase cascade and mitochondrial outer membrane permeabilization (type II behavior). Here, we investigate factors controlling type I versus II phenotypes by performing Lyapunov exponent analysis of an ODE-based model of cell death. The resulting phase diagrams predict that the ratio of XIAP to pro-caspase-3 concen ...[more]

PMID: 22108795

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Lyapunov exponents and phase diagrams reveal multi-factorial control over TRAIL-induced apoptosis.

Publications

Lyapunov exponents and phase diagrams reveal multi-factorial control over TRAIL-induced apoptosis.

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