Abstract
The major physiological stimulus for the secretion of insulin from the pancreatic β-cell is an increase in the plasma glucose concentration. It is well established that glucose-stimulated insulin secretion is associated with the appearance of electrical activity in the β-cell1,2; glucose concentrations above the threshold level for insulin release produce a slow membrane depolarization followed by either oscillatory bursts of action potentials (5–15 mM glucose) or continuous spiking (>16mM glucose). Tracer flux studies3 and microelectrode measurements using intact islets of Langerhans4 have indicated that the initial depolarization induced by glucose is caused by a decrease in the resting membrane permeability to potassium. Evidence also suggests that the electrical5, ionic6 and secretory responses7,8 to glucose are mediated by the metabolism of the sugar within the β-cell. By using cell-attached membrane patches9 from isolated rat pancreatic β-cells, we have now identified a potassium channel (G-channel) that is active at the resting potential and is inhibited by glucose. Closure of this channel requires glucose metabolism. This is the first report of a potassium channel whose activity is modulated by glucose, and which may couple metabolic and ionic events involved in the secretion of insulin.
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Ashcroft, F., Harrison, D. & Ashcroft, S. Glucose induces closure of single potassium channels in isolated rat pancreatic β-cells. Nature 312, 446–448 (1984). https://doi.org/10.1038/312446a0
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DOI: https://doi.org/10.1038/312446a0
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