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- W2025716810 abstract "We studied the effect of protein kinase C (PKC) inhibition and activation on voltage-dependent Ca2+ channels in rat insulinoma RINm5F cells. PKC down-regulation by chronic (24 h) treatment with the PKC activator phorbol 12-myristate 13-acetate (PMA) reduced by about 60% the Ba2+ currents through L- and non-L, non-N-type high-voltage-activated Ca2+ channels, indicating that PKC tonically up-regulates the two main Ca2+ channel subtypes of RINm5F cells under basal conditions. Consistently, PKC activation by acute PMA application caused only a modest increase (average 23%) of Ba2+ currents in a minority of cells (24%). L- and non-L, non-N-type channels were differentially up-regulated by either basal or stimulated PKC activation. Acute up-regulation was predominant on L-type channels and caused an I/V shift of the Ba2+ currents in the hyperpolarizing direction. Non-L, non-N-type channels were less affected by acute PMA application, possibly reflecting a more effective tonic PKC up-regulatory action. Unexpectedly, the increase of Ba2+ currents during acute PMA application was followed by a progressive current decrease, which was also observed in isolation in another 24% of the cells and could be ascribed to PKC-induced ATP depletion, rather than to a direct effect of PKC on Ca2+ channels. We also provide evidence that PKC-mediated phosphorylation is not involved in the G-protein-mediated noradrenergic modulation of Ca2+ channels in RINm5F cells." @default.
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- W2025716810 title "Up‐regulation of L‐ and non‐L, non‐N‐type Ca<sup>2+</sup> channels by basal and stimulated protein kinase C activation in insulin‐secreting RINm5F cells" @default.
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- W2025716810 doi "https://doi.org/10.1016/0014-5793(96)00731-4" @default.
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