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https://hdl.handle.net/2440/24041
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Type: | Journal article |
Title: | Glucagon activates Ca2+ and Cl- channels in rat hepatocytes |
Author: | Aromataris, E. Roberts, M. Barritt, G. Rychkov, G. |
Citation: | The Journal of Physiology, 2006; 573(3):611-625 |
Publisher: | Blackwell Publishing Ltd |
Issue Date: | 2006 |
ISSN: | 0022-3751 1469-7793 |
Statement of Responsibility: | Edoardo C. Aromataris, Michael L. Roberts, Greg J. Barritt and Grigori Y. Rychkov |
Abstract: | Glucagon is one of the major hormonal regulators of glucose metabolism, counteracting the hepatic effects of insulin when the concentration of glucose in the bloodstream falls below a certain level. Glucagon also regulates bile flow, hepatocellular volume and membrane potential of hepatocytes. It is clear that changes in cell volume and membrane potential cannot occur without significant ion fluxes across the plasmamembrane. The effects of glucagon onmembrane currents in hepatocytes, however, are not well understood. Here we show, by patch-clamping of rat hepatocytes, that glucagon activates two types of currents: a small inwardly rectifying Ca2+ current with characteristics similar to those of the store-operated Ca2+ current and a larger outwardly rectifying Cl− current similar to that activated by cell swelling. We show that the mechanism of glucagon action on membrane conductance involves phospholipase C and adenylyl cyclase. Contribution of the adenylyl cyclase-dependent pathway to activation of the currents depended on Epac (exchange protein directly activated by cAMP), but not on protein kinase A. The activation of Ca2+ and Cl− channels is likely to play a key role in the mechanisms by which glucagon regulates hepatocyte metabolism and volume. |
Keywords: | Cells, Cultured Cell Membrane Hepatocytes Animals Rats Rats, Wistar Chlorides Calcium Pyrrolidinones Adenine Estrenes Glucagon Calcium Channels Chloride Channels Receptors, Glucagon Cyclic AMP Calcium Channel Agonists Protein Kinase Inhibitors Patch-Clamp Techniques Ion Channel Gating Time Factors Male Type C Phospholipases Chloride Channel Agonists Adenylyl Cyclases Adenylyl Cyclase Inhibitors |
Description: | The definitive version is available at www.blackwell-synergy.com |
DOI: | 10.1113/jphysiol.2006.109819 |
Published version: | http://dx.doi.org/10.1113/jphysiol.2006.109819 |
Appears in Collections: | Aurora harvest 6 Molecular and Biomedical Science publications |
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