Sodium metatungstate (Sodium polyoxotungstate) is a potent ecto-nucleoside triphosphate diphosphohydrolase (ENTPDase) inhibitor, with Ki values of 2.58 μM, 3.26 μM, and 28.8 μM for NTPDase 1 (CD39), NTPDase 3 and NTPDase 2 respectively. Sodium metatungstate inhibits ATP breakdown but also blocks central synaptic transmission, an action independent of NTPDase inhibition.
| Molecular Weight | 2986.01 |
| Formula | H2Na6O40W12 |
| CAS Number | 12141-67-2 |
| Solubility (25°C) | Water 50 mg/mL DMSO 40 mg/mL |
| Storage | 2-8°C, dry, sealed |
| 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.
[4] Qi Lu, et al. Determination of carbon nanotube density by gradient sedimentation
[5] P G Roessler, et al. Purification of Hydrogenase from Chlamydomonas reinhardtii
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