Electrical bursting, calcium oscillations, and synchronization of pancreatic islets.
Electrical bursting, calcium oscillations, and synchronization of pancreatic islets.
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DOI:
10.1007/978-90-481-3271-3_12
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发表时间:
2010
影响因子:
--
通讯作者:
Satin, Leslie S.
中科院分区:
文献类型:
--
作者:
Bertram, Richard;Sherman, Arthur;Satin, Leslie S.
Oscillations are an integral part of insulin secretion, and are due ultimately to oscillations in the electrical activity of pancreatic β-cells, called bursting. In this review we discuss islet bursting oscillations and a unified biophysical model for this multi-scale behavior. We describe how electrical bursting is related to oscillations in the intracellular Ca2+ concentration within β-cells, and the role played by metabolic oscillations. Finally, we discuss two potential mechanisms for the synchronization of islets within the pancreas. Some degree of synchronization must occur, since distinct oscillations in insulin levels have been observed in hepatic portal blood and in peripheral blood sampling of rats, dogs, and humans. Our central hypothesis, supported by several lines of evidence, is that insulin oscillations are crucial to normal glucose homeostasis. Disturbance of oscillations, either at the level of the individual islet or at the level of islet synchronization, is detrimental and can play a major role in type II diabetes.
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