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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Modulation of dihydropyridine-sensitive Ca2+ channels by glucose metabolism in mouse pancreatic beta-cells.

Glucose stimulates insulin secretion from the pancreatic beta-cell by increasing the cytosolic calcium concentration. It is believed that this increment results mainly from Ca2+ influx through dihydropyridine-sensitive calcium channels because insulin secretion is abolished by dihydropyridine antagonists and is potentiated by dihydropyridine agonists. Glucose may influence Ca2+ influx through these channels in two ways: either by regulating the beta-cell membrane potential or by biochemical modulation of the channel itself. The former mechanism is well established. Glucose metabolism, by closing ATP-sensitive K+ channels, depolarizes the beta-cell membrane and initiates Ca2+-dependent electrical activity, with higher glucose concentrations further increasing Ca2+ influx by raising the frequency of action potentials. We show here that glucose metabolism also increases calcium influx directly, by modulating the activity of dihydropyridine-sensitive Ca2+ channels.[1]


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