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The effect of membrane potential on Ca2+ activated K+ channels was studied on human peripheral lymphocytes. Membrane potential was monitored using bisoxonol and flow cytometry. 1 mM Ca2+ in the presence of 2 microM ionomycin depolarized the control cell population, while 100 microM Ca2+ caused hyperpolarization. However 1 mM Ca2+ had a hyperpolarizing effect on previously partially depolarized cells. Potassium channel blockers did not influence the depolarization, while they inhibited the hyperpolarization. Based on the experimental evidence a voltage gating of Ca2+ activated K+ channels is suggested.
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