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Palytoxin (PTX) caused K+ release from rabbit erythrocytes which was dependent on the concentrations of extracellular Ca2+ and PTX. In a Ca2+-free solution, PTX still caused a slow K+ release. An intracellular Ca2+ antagonist, TMB-8, an intracellular Ca2+ chelator, quin 2, and calmodulin inhibitors, prenylamine, W-7 and W-5, inhibited the PTX-induced K+ release in a Ca2+-free solution. These results suggest that the PTX-induced K+ release is dependent on the process including intracellular Ca2+ and calmodulin.
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