Digitoxin is an effective Na+/K+-ATPase inhibitor, the EC50 value of Digitoxin is 0.78 μM. IC50 value: 0.78 μM (EC50) Target: Na+/K+-ATPase in vitro: Digitoxin shows a significantly cytotoxic effect in H1975 cells by causing G2 phase arrest, also remarkably activates 5' adenosine monophosphate-activated protein kinase (AMPK). Moreover, Digitoxin suppresses microtubule formation through decreasing α-tubulin. Digitoxin effectively depresses the growth of TKI-resistance NSCLC H1975 cells by inhibiting microtubule polymerization and inducing cell cycle arrest. Digitoxin has the highest cytotoxicity in H1975 cells, whose CC50 value was 0.19 ± 0.06 μM. Digitoxin-induced inhibition mechanism is likely due to causing G2/M cell cycle arrest in H1975 cells in dose dependent manners.
| Molecular Weight | 764.94 |
| CAS Number | 71-63-6 |
| Form | Solid |
| Solubility (25°C) | DMSO 90 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
[3] K G Dahmen, et al. [Digitoxin overdose with reversible thrombocytopenia]
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