Abstract
Stimulus-secretion coupling (SSC) of pancreatic islet cells comprises electrical activity. Changes of the membrane potential (Vm) are regulated by metabolism-dependent alterations in ion channel activity.
This coupling is best explored in beta cells. The effect of glucose is directly linked to mitochondrial metabolism as the ATP/ADP ratio determines the open probability of ATP-sensitive K+ channels (KATP channels). Nucleotide sensitivity and concentration in the direct vicinity of the channels are controlled by several factors including phospholipids, fatty acids, and kinases, e.g., creatine and adenylate kinase. Closure of KATP channels leads to depolarization of beta cells via a yet unknown depolarizing current. Ca2+ influx during action potentials (APs) results in an increase of the cytosolic Ca2+ concentration ([Ca2+]c) that triggers exocytosis. APs are elicited by opening of voltage-dependent Na+ and/or Ca2+ channels and repolarized by voltage- and/or Ca2+-dependent K+ channels. At a constant stimulatory glucose concentration, APs are clustered in bursts that are interrupted by hyperpolarized interburst phases. Bursting electrical activity induces parallel fluctuations in [Ca2+]c and insulin secretion. Bursts are terminated by IksIow consisting of currents through Ca2+-dependent K+ channels and KATP channels. This chapter focuses on structure, characteristics, physiological function, and regulation of ion channels in beta cells. Information about pharmacological drugs acting on KATP channels, KATP channelopathies, and influence of oxidative stress on KATP channel function is provided. One focus is the outstanding significance of L-type Ca2+ channels for insulin secretion. The role of less well-characterized beta cell channels including voltage-dependent Na+ channels, volume-sensitive anion channels (VSACs), transient receptor potential (TRP)-related channels, and hyperpolarization-activated cyclic nucleotide-gated (HCN) channels is discussed. A model of beta cell oscillations provides insight in the interplay of the different channels to induce and maintain electrical activity. Regulation of beta cell electrical activity by hormones and the autonomous nervous system is discussed.
Alpha and delta cells are also equipped with KATP channels and voltage-dependent Na+, K+, and Ca2+ channels. Yet the SSC of these cells is less clear and is not necessarily dependent on KATP channel closure. Different ion channels of alpha and delta cells are introduced and SSC in alpha cells is described with special respect to paracrine effects of insulin and GABA secreted from beta cells.
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Drews, G., Krippeit-Drews, P., Düfer, M. (2014). Electrophysiology of Islet Cells. In: Islam, M. (eds) Islets of Langerhans, 2. ed.. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6884-0_5-2
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DOI: https://doi.org/10.1007/978-94-007-6884-0_5-2
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Electrophysiology of Islet Cells- Published:
- 16 April 2014
DOI: https://doi.org/10.1007/978-94-007-6884-0_5-2
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Electrophysiology of Islet Cells- Published:
- 14 February 2014
DOI: https://doi.org/10.1007/978-94-007-6884-0_5-1