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In vitro: ICA-069673 is found to be 20-fold selective for KCNQ2/Q3 over KCNQ3/Q5 and has no measurable activity against a panel of cardiac ion channels (IC50 values > 30 μM for hERG, Nav1.5, L type channels, and KCNQ1) as well as no activity on GABA(A) gated channels at 10 μM. ICA-069673 exhibits much stronger effects on KCNQ2 channels, including a large hyperpolarizing shift of the voltage-dependence of activation, an 2-fold enhancement of peak current and pronounced subtype specificity for KCNQ2 over KCNQ3. Based on ICA73 sensitivity of chimeric constructs of the transmembrane segments of KCNQ2 and KCNQ3, this drug appears to interact with the KCNQ2 voltage sensor (S1-S4).
| Cell Experiment | |
|---|---|
| Cell lines | DSM cells |
| Preparation method | For the first protocol, continuous stimulation of 10-Hz EFS frequency was delivered at 1-minute intervals and a stable baseline and amplitude were reached prior to applying increasing concentrations of ICA-069673 (100 nM–30 µM). In the second EFS protocol, we applied incremental EFS stimulation frequencies (3.5, 5, 7.5, 10, 12.5, 15, 20, 30, 40, and 50 Hz) at 3-minute intervals for a control period, and then again in the presence of a single concentration of ICA-069673 (either 3 or 10 µM). |
| Concentrations | 100 nM–30 µM |
| Incubation time | |
| Animal Experiment | |
|---|---|
| Animal models | |
| Formulation | |
| Dosages | |
| Administration | |
| Molecular Weight | 269.63 |
| Formula | C11H6ClF2N3O |
| CAS Number | 582323-16-8 |
| Solubility (25°C) | ≥ 34 mg/mL in DMSO |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
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| Doxapram hydrochloride hydrate
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| Gliquidone
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| Pinacidil monohydrate
Pinacidil monohydrate is known to augment a time-independent outward current in cardiac tissues by activating the ATP-regulated potassium channels. |
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