| Assay Method Information | |
| | IonWorks Barracuda (IWB) Automated Patch Clamp Assay |
| Description: | Human Nav1.7 currents were recorded in population patch-clamp mode with the IWB automated electrophysiology system (Molecular Devices, LLC, Sunnyvale, CA). Spiking HEK cells (without Kir2.1 transfection) were cultured and prepared for recordings as previously described for IonWorks Quattro testing1. The external solution consisted of the following (in mM): NaCl 140, KCl 5, CaCl2 2, MgCl2 1, HEPES 10, and glucose 11, pH 7.4, with N-methyl-D-glucamine at 320 mOsmol. The internal solution consisted of the following (in mM): KCl 70, KF 70, MgCl2 0.25, HEDTA 5, and HEPES 10, pH 7.25, with Nmethyl-D-glucamine, 300 mOsmol. From a holding potential of −110 mV, currents were elicited by a train of 26 depolarizations of 150 ms duration to −20 mV at a frequency of 5 Hz. Cells were then clamped to −20 mV for a period of 4 minutes in the presence of a single concentration of test compound. Following this compound incubation period, cells were clamped to −110 mV for three seconds to recover unbound channels and put through the same 26 pulse voltage protocol as above. Peak inward current during the 26th pulse to −20 mV in the presence of compound was divided by the peak inward current evoked by the 26th pulse to −20 mV in the absence of compound to determine percent inhibition. |
| Affinity data for this assay | |
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