[Phenazine methosulfate system-induced membrane hyperpolarization in the human erythrocytes].

Erythrocyte membrane potential was recorded via measurement of pH of the incubation medium in presence ofprothonophore. The increase of intracellular calcium concentration in presence of calcium ionophore A23187 and addition of the artificial redox-system ascorbate-phenazine methosulfate led to membrane hyperpolarization due to opening of Ca(2+)-activated potassium channels that are regulated by multiple signaling pathways. The opening of the Ca(2+)-activated potassium channels in presence of artificial redox-system ascorbate-phenazine methosulfate is mediated at least by two mechanisms including an increase in affinity of channels to calcium ions and involvement of the protein SH-groups and the components of the respiratory circuit which have beer found in erythrocyte membrane.