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"Take Me To Your Leader": An Electrophysiological Appraisal of the Role of Hub Cells in Pancreatic Islets

Journal article
Authors L. S. Satin
Q. Zhang
Patrik Rorsman
Published in Diabetes
Volume 69
Issue 5
Pages 830-836
ISSN 0012-1797
Publication year 2020
Published at Institute of Neuroscience and Physiology, Department of Physiology
Pages 830-836
Language en
Links dx.doi.org/10.2337/dbi19-0012
Keywords membrane-potential oscillations, cytoplasmic ca2+ concentration, beta-cells, insulin-secretion, electrical-activity, gap-junctions, glucose, release, dynamics, langerhans, Endocrinology & Metabolism
Subject categories Endocrinology and Diabetes

Abstract

The coordinated electrical activity of beta-cells within the pancreatic islet drives oscillatory insulin secretion. A recent hypothesis postulates that specially equipped "hub" or "leader" cells within the beta-cell network drive islet oscillations and that electrically silencing or optically ablating these cells suppresses coordinated electrical activity (and thus insulin secretion) in the rest of the islet. In this Perspective, we discuss this hypothesis in relation to established principles of electrophysiological theory. We conclude that whereas electrical coupling between beta-cells is sufficient for the propagation of excitation across the islet, there is no obvious electrophysiological mechanism that explains how hyperpolarizing a hub cell results in widespread inhibition of islet electrical activity and disruption of their coordination. Thus, intraislet diffusible factors should perhaps be considered as an alternate mechanism.

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