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EMBO J
1994 Nov 01;1321:5032-9. doi: 10.1002/j.1460-2075.1994.tb06832.x.
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Voltage-dependent facilitation of a neuronal alpha 1C L-type calcium channel.
Bourinet E, Charnet P, Tomlinson WJ, Stea A, Snutch TP, Nargeot J.
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Calcium entry into excitable cells through voltage-gated calcium channels can be influenced by both the rate and pattern of action potentials. We report here that a cloned neuronal alpha 1C L-type calcium channel can be facilitated by positive pre-depolarization. Both calcium and barium were effective as charge carriers in eliciting voltage-dependent facilitation. The induction of facilitation was shown to be independent of intracellular calcium levels, G-protein interaction and the level of phosphatase activity. Facilitation was reduced by the injection of inhibitors of protein kinase A and required the coexpression of a calcium channel beta subunit. In contrast, three neuronal non-L-type calcium channels, alpha 1A, alpha 1B and alpha 1E, were not subject to voltage-dependent facilitation when coexpressed with a beta subunit. The results indicate that the mechanism of neuronal L-type calcium channel facilitation involves the interaction of alpha 1 and beta subunits and is dependent on protein kinase A activity. The selective voltage-dependent modulation of L-type calcium channels is likely to play an important role in neuronal physiology and plasticity.
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