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Importazole specifically blocks importin-β-mediated nuclear import both in Xenopus egg extracts and cultured cells, without disrupting transportin-mediated nuclear import or CRM1-mediated nuclear export. Importazole impairs the release of an importin-β cargo FRET probe and causes both predicted and novel defects in spindle assembly[1]. Importazole displays an IC50 of approximately 15 μM for inhibition of NFAT-GFP import. Importazole has an IC50 of approximately 22.5 μM in HeLa cells following treatment over a 24-hour period. Importazole induces a dose-and time-dependent inhibition of myeloma cells growth. And the IC50 values of importazole on RPMI 8226 and NCI-H929 after 48 hours incubation are (4.43±0.41) and (4.78±0.35) μmol/L, respectively. Treatment of RPMI 8226 and NCI-H929 cells with 8 μmol/L importazole for 24 h could inhibit NF-κB import to nucleus and reduce its DNA binding activity.
| Cell Experiment | |
|---|---|
| Cell lines | HEK 293 cells |
| Preparation method | HEK 293 cells stably expressing NFAT-GFP are grown on glass coverslips to approximately 50% confluency prior to drug treatment. In all cases, importazole is used at 40 μM and leptomycin B is used at 10 ng/mL. For controls, DMSO is used at a concentration of 0.4%. Ionomycin is added at 1.25 μM. Importazole and leptomycin B treatments are all for 1 hour. In all experiments cells are fixed with 4% formaldehyde prior to fluorescence microscopy. DNA is visualized with 1 μg/mL Hoechst dye. For quantification, 100 cells from each condition are analyzed and the percentage that shows nuclear accumulation of NFAT-GFP are calculated |
| Concentrations | 40 μM |
| Incubation time | 1 h |
| Animal Experiment | |
|---|---|
| Animal models | |
| Formulation | |
| Dosages | |
| Administration | |
| Molecular Weight | 318.42 |
| Formula | C20H22N4 |
| CAS Number | 662163-81-7 |
| Solubility (25°C) | DMSO ≥ 30 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
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