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The Akt switch model: Is location sufficient?

Catheryn W Gray1, Adelle C F Coster1

  • 1School of Mathematics and Statistics, UNSW, Sydney, Australia.

Journal of Theoretical Biology
|March 20, 2016
PubMed
Summary
This summary is machine-generated.

We developed a model of Akt activation, a key regulator of glucose transport. This model tracks Akt

Keywords:
Akt/PKBInsulin signalingODE model

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cellular Signaling
  • Systems Biology

Background:

  • Akt/PKB is a crucial signaling node regulating mammalian cell pathways.
  • Akt mediates insulin-stimulated glucose transport via GLUT4 translocation.
  • Dysregulated Akt signaling is linked to diabetes, cancer, and cardiovascular disease.

Purpose of the Study:

  • To develop a computational model of Akt activation.
  • To track both the biochemical state and cellular location of Akt.
  • To elucidate anomalies in insulin signaling via Akt.

Main Methods:

  • Developed a linear, four-compartment ordinary differential equation (ODE) model.
  • The model tracks Akt's biochemical state and physical location (PM, cytoplasm, nucleus).
  • Model is computationally tractable and readily analyzed.

Main Results:

  • The model captures key features of Akt activation, consistent with experimental data.
  • It explains maximal GLUT4 translocation with minimal Akt phosphorylation.
  • The model allows for diverse downstream signaling without separate feedback loops.

Conclusions:

  • The developed ODE model provides a simplified yet comprehensive view of Akt activation.
  • Spatial distribution of phosphorylated Akt (pAkt) is a key regulatory determinant.
  • The model aids in understanding insulin signaling and its dysregulation.