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- W2396526142 abstract "Objective There is a correlation between serum hyperlipidemia and hearing loss. Cholesterol is an integral component of the cell membrane and regulates the activity of ion channels in the lipid bilayer. The aim of this study was to investigate the effects of cholesterol on the potassium currents in IHCs by using the cholesterol-depleting drug, MβCD, and water-soluble cholesterol. Methods IHCs were acutely isolated from a mature guinea-pig cochlea and potassium currents were recorded. MβCD and water-soluble cholesterol were applied to IHCs under pressure puff pipettes. Results IHCs showed outwardly rectifying currents (IK,f and IK,s) in response to depolarizing voltage pulses, with only a slight inward current (IK,n) when hyperpolarized. In 10 mM MβCD solutions, the amplitude of outward K currents reversely decreased; however, fast activation kinetics was preserved. In contrast, in solution of 1 mM water-soluble cholesterol, the amplitude of outward K currents reversely increased. At the membrane potential of +110 mV, relative conductances were 0.87 ± 0.07 and 1.18 ± 0.11 in MβCD solutions and cholesterol solutions, respectively. Conclusion The amplitude of K currents in isolated IHCs was reversely changed by cholesterol-depleting drug and water-soluble cholesterol. These results demonstrated the possibility of the involvement of IHC function in hyperlipidemia-induced inner ear disorders." @default.
- W2396526142 created "2016-06-24" @default.
- W2396526142 creator A5030572785 @default.
- W2396526142 date "2017-02-01" @default.
- W2396526142 modified "2023-10-16" @default.
- W2396526142 title "Cholesterol influences potassium currents in inner hair cells isolated from guinea pig cochlea" @default.
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- W2396526142 doi "https://doi.org/10.1016/j.anl.2016.04.010" @default.
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