| Assay Method Information | |
| | Human Nav1.5 Inhibitory Activity Evaluation |
| Description: | The amount of current through human Nav1.5 was recorded using a fully automatic patch clamp device QPatch16X at room temperature. As the extracellular solution, 145 mM NaCl, 4 mM KCl, 1 mM MgCl2, 2 mM CaCl2, 10 mM Glucose, and 10 mM HEPES at pH 7.4 was used. As the intracellular solution, 135 mM CsF, ⅕ mM EGTA/CsOH, 10 mM HEPES, and 10 mM NaCl at pH 7.3 was used. The test compounds were dissolved in DMSO and diluted with the extracellular solution to attend the DMSO concentration of 0.1% at the time of assay.The current response was obtained at a sampling frequency of 25 kHz, and noise was removed with a 3 kHz low-pass filter. The holding potential was −80 mV. Correction of the leakage current was carried out by applying a step pulse of −100 mV before the test pulse. In order to investigate human Nav1.5 inhibitory effect of the test compound, test pulses imitating the action potential of cardiomyocytes were continuously given 20 times. The test pulses were given before and after the test compound addition. |
| Affinity data for this assay | |
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