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Glucose sensing in the pancreatic beta cell: a computational systems analysis
Leonid E Fridlyand1, Louis H Philipson
1Department of Medicine, The University of Chicago, Chicago, IL 60637, USA. lfridlia@medicine.bsd.uchicago.edu
Theoretical Biology & Medical Modelling
|May 26, 2010
Summary
Mathematical modeling reveals that pancreatic beta-cells utilize specific mitochondrial control mechanisms for insulin secretion and reactive oxygen species (ROS) generation, highlighting a unique role for mitochondrial membrane potential in glucose sensing.
Area of Science:
- Metabolic regulation
- Systems biology
- Cellular physiology
Background:
- Pancreatic beta-cells secrete insulin in response to glucose via metabolic signaling.
- Glucose metabolism increases ATP/ADP ratio, leading to calcium influx and insulin release.
- Beta-cell secretion regulation is distinct from contraction-coupled mechanisms.
Purpose of the Study:
- To investigate cytoplasmic and mitochondrial contributions to glucose-induced insulin secretion.
- To develop a mathematical model of beta-cell glucose sensitivity.
- To understand the systems biology of beta-cell secretory coupling.
Main Methods:
- Developed a mathematical model of beta-cell glucose sensitivity.
- Modeled cytoplasmic processes: glucokinase, glycolysis, pyruvate reduction, ATP/ADP dynamics.
- Modeled mitochondrial processes: NADH production, electron transport chain, proton motive force, ATP synthesis, redox shuttles, and calcium handling.
Main Results:
- Model accurately predicts metabolic parameter changes (ATP/ADP, Ca2+) with glucose variations.
- Identified lower mitochondrial membrane potential in beta-cells for precise ATP/ADP regulation.
- Demonstrated regulation of beta-cell function by lactate dehydrogenase, uncoupling proteins, and redox shuttles.
Conclusions:
- The model highlights specialized mitochondrial control in insulin secretion and ROS generation.
- Mitochondrial membrane potential is crucial for beta-cell glucose sensing and function.
- The model serves as a tool for hypothesis testing in beta-cell physiology and pathology.
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