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Flipping the switch on the hub cell: Islet desynchronization through cell silencing.

Janita P Hogan1, Bradford E Peercy1

  • 1Department of Mathematics & Statistics, University of Maryland Baltimore County, Baltimore, Maryland, United States of America.

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|April 8, 2021
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Summary

Pancreatic beta cells regulate blood glucose. New research suggests "switch cells," not "hub cells," control islet activity and insulin secretion, challenging previous models.

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Area of Science:

  • Endocrinology
  • Computational Biology
  • Cellular Physiology

Background:

  • Pancreatic beta cells in islets of Langerhans maintain glucose homeostasis through synchronized insulin secretion.
  • Gap junctions coordinate beta cell electrical activity and calcium oscillations.
  • Recent studies suggested 'hub cells' regulate islet function, challenging the 'democratic' secretion model.

Purpose of the Study:

  • To test the 'hub cell' hypothesis using a mechanistic model of beta cell electrical and calcium dynamics.
  • To investigate the role of specific cells in coordinating islet-wide insulin secretion.

Main Methods:

  • A computational model simulating beta cell electrical and calcium dynamics in a gap junction-coupled network was developed.
  • Functional connectivity networks were derived from simulated calcium traces.
  • Network centrality measures were used to identify potential 'hub cells', and their silencing was simulated.
  • A systematic cell-silencing approach was employed to identify cells critical for overall islet activity.

Main Results:

  • Simulated networks exhibited scale-free functional connectivity, consistent with experimental findings.
  • Identified 'hub cells' did not disrupt islet synchronization when silenced.
  • A novel cell type, termed 'switch cells', was identified; their silencing effectively halted islet activity, despite not being highly functionally connected.

Conclusions:

  • The 'hub cell' hypothesis for islet coordination is not supported by this model.
  • Beta cell networks possess 'switch cells' that are critical for regulating overall islet activity and insulin secretion.
  • These findings necessitate a re-evaluation of the mechanisms governing pancreatic islet function and glucose homeostasis.