Temperature dependence of potassium currents in isolated inner hair cells from guinea-pig cochlea

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The temperature dependence of potassium currents in isolated inner hair cells(IHCs) from mature guinea-pig cochlea was investigated. IHCs showed outwardly rectifying currents in response to depolarizing voltage pulses, with only a slight inward current when hyperpolarized. The amplitude of both outward and inward currents demonstrated no temperature dependency, however, activation and inactivation rates were faster at 36 oC than at room temperature. Half-time for activation was shorter at 36 oC than at room temperature at membrane potentials of-10,+ 10,+ 20,+ 30, and+ 40 mV. Q10 for the activation rate was 1. 83. The inactivation time constant in outward TEA-sensitive potassium currents was much smaller at 36 oC than at room temperature between the membrane potentials of-20 and+ 60 mV. Q10 for the inactivation time constant was 3. 19.