Figure 4.
Effect of NS5806 on KV4 channels in presence or absence of KChIP2. KV4 channels were expressed with and without KChIP2 in Xenopus laevis oocytes and currents were elicited from a holding potential of −100 mV by a step to +40 mV in absence and presence of 10 µM NS5806. The first 150 ms of current decay was fitted to a mono-exponential function, and the time constants (τ) are shown as a function of voltage. (A) Representative KV4.1 (n= 5) and KV4.1/KChIP2 currents (n= 6) and τ-values as a function of voltage before and after application of drug. (B) Representative KV4.2 (n= 6) and KV4.2/KChIP2 (n= 10) currents and τ-values as a function of voltage. (C) Representative KV4.3 (n= 8) and KV4.3/KChIP2 (n= 8) currents and τ-values as a function of voltage. *P < 0.05, **P < 0.01, ***P < 0.001; significantly different in the absence and presence of NS5806. KChIP2, K channel interacting protein 2.