Modeling Time Delay in the NFκB Signaling Pathway
Author Information
Author(s): Witt Johannes, Barisic Sandra, Sawodny Oliver, Ederer Michael, Kulms Dagmar, Sauter Thomas
Primary Institution: Institute for System Dynamics, University of Stuttgart
Hypothesis
What mechanisms cause the delay in IKKβ phosphorylation following low doses of IL-1 stimulation?
Conclusion
The TRAF6 auto-ubiquitination mechanism best explains the observed delay in IKKβ phosphorylation at low IL-1 doses.
Supporting Evidence
- The TRAF extension of the model showed the best fit to the experimental data.
- All model extensions were able to reproduce the delay in IKKβ phosphorylation.
- The TRAF6 mechanism is consistent with existing literature on IL-1 signaling.
Takeaway
When cells are stimulated with a low dose of IL-1, there is a delay in a specific protein's activation, and researchers think this delay happens because of a feedback loop involving another protein called TRAF6.
Methodology
The study used a systems biological approach with ordinary differential equations to model IKKβ phosphorylation and dephosphorylation.
Limitations
Determining low levels of phosphorylated IKKβ is experimentally challenging, making the measurements somewhat semiquantitative.
Digital Object Identifier (DOI)
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