Abstract
The presence of calcium-activated chloride current was shown using on freshly isolated rat Purkinje cerebellum neiurones and the pacth-clamp method in the whole-cell configuration. Chloride currents appeared in sodium-free external solution and reversibly disappeared in chloride-free or calcium-free external solution. Replacing of K+ ions (120 mM) to Cs+ ions in micropipette (120 mM) show the chloride currents even with 140 mM Na+ in external solution. This current was blocked to 80–100% by nifluminic acid (25–100 ΜM). It was found out that well known blockers of potassium channels tetraethylammonium (TEA) and 4-aminopyridine (4-AP) also effectively blocked chloride channels. The IC50 values for TEA and 4-AP were 130 ΜM, and 110 ΜM respectively. The action of TEA was reversible, while 4-AP at concentration 100 ΜM and above irreversibly blocked chloride channels.
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