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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Diabetes+Obes+Metab 2007 ; 9 (Suppl 2): 89-98 Nephropedia Template TP
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Action potentials and insulin secretion: new insights into the role of Kv channels #MMPMID17919183
Jacobson DA; Philipson LH
Diabetes Obes Metab 2007[Nov]; 9 (Suppl 2): 89-98 PMID17919183show ga
Coordinated electrical activity allows pancreatic ?-cells to respond to secretagogues with calcium entry followed by insulin secretion. Metabolism of glucose affects multiple membrane proteins including ion channels, transporters and pumps that collaborate in a cascade of electrical activity resulting in insulin release. Glucose induces ?-cell depolarization resulting in the firing of action potentials (APs), which are the primary electrical signal of the ?-cell. They are shaped by orchestrated activation of ion channels. Here we give an overview of the voltage-gated potassium (Kv) channels of the ?-cell, which are responsible in part for the falling phase of the AP, and how their regulation affects insulin secretion. ? cells contain several Kv channels allowing dynamic integration of multiple signals on repolarization of glucose-stimulated APs. Recent studies on Kv channel regulation by cAMP and arachidonic acid and on the Kv2.1 null mouse have greatly increased our understanding of ?-cell excitation?secretion coupling.