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- W2029167404 abstract "BOVINE chromaffin cells have two components of whole-cell Ca2+ current: 'standard' Ca2+ currents that are activated by brief depolarizations, and 'facilitation' Ca2+ currents, which are normally quiescent but can be activated by large pre-depolarizations or by repetitive depolarizations to physiological potentials1–5. The activation of protein kinase A can also stimulate Ca2+ current facilitation, indicating that phosphorylation can play a part in facilitation6. Here we investigate the role of protein phosphorylation in the recruitment of facilitation Ca2+ currents by prepulses or repetitive depolarizations. We find that recruitment of facilitation by depolarization is a rapid first-order process which is suppressed by inhibitors of protein phosphorylation or by injection of phosphatase 2A into cells. Recruitment of facilitation Ca2+ current by voltage is normally reversible but phosphatase inhibitors render it irreversible. Our results indicate that recruitment of these Ca2+ currents by prepulses or repetitive depolarizations involves voltage-dependent phosphorylation of the facilitation Ca2+ channel or a closely associated regulatory protein. Voltage-dependent phosphorylation may therefore be a mechanism by which membrane potential can modulate ion channel activity." @default.
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- W2029167404 date "1992-07-01" @default.
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- W2029167404 title "Voltage-dependent phosphorylation may recruit Ca2+ current facilitation in chromaff in cells" @default.
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- W2029167404 doi "https://doi.org/10.1038/358063a0" @default.
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