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- W2030878499 abstract "Local application of acetylcholine (ACh; 0.3 mM, 20 microl) elicited bi-phasic elevation of intracellular Ca2+ concentrations (contractile fast and non-contractile slow Ca2- signal measured as aequorin luminescence) in diaphragm muscle preparation. A neuronal nicotinic antagonist methyllycaconitine (MLA; 0.01-1 microM), which did not affect the fast Ca2+ transients and twitch tension, concentration-dependently depressed only the slow Ca2+ component. Ca2+ channel blockers, Cd2+ (200 microM), nitrendipine (1 microM), verapamil (1 microM) and diltiazem (1 microM), or a Na+ channel blocker tetrodotoxin (TTX; 0.1 microM) failed to prevent the generation of slow Ca2+ response. Perfusion of ACh (1 microM) to isolated single skeletal (flexor digitorum brevis) muscle cells pretreated with TTX (0.1 microM) also elicited a slow Ca2+ signal measured as confocal imaging with a fluorescent dye, fluo-3, at the endplate region. MLA (1 microM) antagonized against the ACh perfusion-elicited slow Ca2+ signal. Perfusion of choline (1 mM), a neuronal nicotinic agonist, also elicited the MLA-sensitive slow Ca2+ signal. These results strongly suggest that the ACh-induced slow Ca2+ signal reflects Ca2+ entry through a postsynaptic MLA-sensitive neuronal nicotinic ACh receptor subtype at the neuromuscular junction." @default.
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- W2030878499 title "Methyllycaconitine-sensitive neuronal nicotinic receptor-operated slow Ca2+ signal by local application or perfusion of ACh at the mouse neuromuscular junction" @default.
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- W2030878499 doi "https://doi.org/10.1016/s0168-0102(98)00109-6" @default.
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