Stable and flexible system for glucose homeostasis

Area of Science:

• Endocrinology
• Computational Biology
• Systems Biology

Background:

• Pancreatic islets regulate glucose homeostasis via α, β, and δ cells.
• Observed out-of-phase (α-β) and in-phase (β-δ) hormone release synchronization.
• The collective physiological role of islet cell interactions remains underexplored.

Purpose of the Study:

• To model synchronized hormone release from pancreatic islets.
• To investigate the role of cellular interactions in islet function.
• To explore the physiological significance of islet cell synchronization.

Main Methods:

• Developed a mathematical model using coupled phase oscillators.
• Incorporated known cellular interactions within the model.
• Analyzed model outputs to reproduce observed synchronization patterns.

Main Results:

• The model requires a positive β-to-δ cell interaction to replicate in-phase insulin and somatostatin release.
• The model demonstrates that δ cells enhance islet system adaptability to glucose fluctuations.
• Synchronization dynamics are sensitive to the sign of β-δ cell interaction.

Conclusions:

• A positive β-to-δ cell interaction is essential for β-δ cell in-phase synchronization.
• δ cells play a key role in the islet's flexible response to glucose changes.
• This modeling approach provides insights into the integrated function of pancreatic islets.