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.
Satin, Leslie S.
中科院分区:
医学4区
文献类型:
--
作者:
Bertram, Richard;Sherman, Arthur;Satin, Leslie S.

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振荡是胰岛素分泌的一个组成部分,最终是由于胰腺 β 细胞电活动的振荡(称为爆发)造成的。在这篇综述中,我们讨论了胰岛破裂振荡和这种多尺度行为的统一生物物理模型。我们描述了电爆发与 β 细胞内 Ca2+ 浓度振荡的关系,以及代谢振荡所起的作用。最后,我们讨论了胰腺内胰岛同步的两种潜在机制。必须发生某种程度的同步,因为在大鼠、狗和人类的肝门血和外周血样本中观察到胰岛素水平的明显波动。我们的中心假设(得到多项证据的支持)是,胰岛素振荡对于正常的葡萄糖稳态至关重要。振荡紊乱,无论是在单个胰岛水平还是在胰岛同步水平,都是有害的,并且可能在 II 型糖尿病中发挥重要作用。
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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