Modeling Apoptosis Pathways and Feedback Mechanisms
Author Information
Author(s): Stefan Legewie, Nils Blüthgen, Hanspeter Herzel
Primary Institution: Institute for Theoretical Biology, Humboldt University, Berlin, Germany
Hypothesis
Can mathematical modeling identify the role of inhibitors of apoptosis in bistability and feedback in caspase activation?
Conclusion
The study reveals that inhibitors of apoptosis play a crucial role in establishing bistability and irreversibility in caspase activation.
Supporting Evidence
- The model shows that inhibition of caspase-3 and caspase-9 leads to positive feedback in apoptosis.
- Bistability in caspase activation is demonstrated through simulations.
- Cell-specific protein expression affects the qualitative behavior of caspase activation.
- Known regulators can shift the apoptotic threshold stimulus.
Takeaway
This study shows how cells decide to die by using a complex set of signals, and how certain proteins help make that decision more reliable.
Methodology
The authors used a quantitative kinetic model to analyze the intrinsic apoptosis pathway and the role of inhibitors of apoptosis.
Limitations
The model does not account for all cellular contexts and assumes constant protein concentrations.
Digital Object Identifier (DOI)
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