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• W2010597921 abstract "Receptor-induced activation of protein kinase C (PKC) plays an important role in modulation of various types of ionic channels in neurons. For example, PKC causes facilitation or long-lasting activation of certain ionic channels involved in spike firing after the receptor stimulation. We investigated the effect of serotonin (5-HT) on the voltage-dependent Ca(2+) channels in RB and RC neurons of Aplysia ganglia under voltage clamp. An outward current response was induced by voltage change of the cell membrane from -60 mV to +10 mV. Application of 5-HT significantly augmented the outward current response to the voltage change. Both the outward current and the augmenting effect of 5-HT markedly decreased when examined in either Ca(2+)-free, 10 mM tetraethylammonium, or 0.3 mM Cd(2+)-solution, indicating the current to be Ca(2+)-activated K(+) current produced by Ca(2+) entry. Intracellular application of either guanosine 5'-O-(2-thiodiphosphate) or cholera toxin (CTX), reagents for G-proteins, irreversibly blocked the augmenting effect of 5-HT. Application of phorbol dibutylate (PDBu), an activator of PKC, augmented the outward current and the effect of 5-HT was occluded after PDBu application. Staurosporine, a specific inhibitor of PKC, markedly suppressed the augmenting effects of both 5-HT and PDBu on the outward current. However, either 5-HT or PDBu did not augment the Ca(2+)-activated K(+) current induced by intracellular injection of Ca(2+) but rather depressed it. These results suggest that stimulation of 5-HT receptor may activate a novel type of CTX-sensitive G-protein and subsequent PKC, and that phosphorylation of voltage-dependent Ca(2+) channels may result in the increase in Ca(2+) entry and subsequent Ca(2+)-activated K(+) current. The mechanism may contribute to retain the long-lasting activation without broadening of the spike width during the excitatory response to 5-HT in these neurons." @default.
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• W2010597921 date "2007-01-01" @default.
• W2010597921 modified "2023-09-22" @default.
• W2010597921 title "Augmenting Effect of Serotonin on the Voltage-Dependent Ca2+ Current and Subsequently Activated K+ Current in Aplysia Neurons" @default.
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• W2010597921 doi "https://doi.org/10.1620/tjem.211.31" @default.
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