Avatrombopag (AKR-501) is an orally active, nonpeptide thrombopoietin (TPO) receptor agonist (EC50=3.3 nM). Avatrombopag mimics the biological activities of TPO. Avatrombopag increases platelet production by activating the intracellular signaling system. Avatrombopag is a substrate of cytochrome P450 (CYP) 2C9 and CYP3A. Avatrombopag (0-100 nM) supports the proliferation of TPO receptor expressing Ba/F3 cell in a concentration-dependent fashion. Avatrombopag (0-3 μM) induces tyrosine phosphorylation of STAT3 and STAT5, and threonine phosphorylation of ERK in the cells, as did rhTPO. Avatrombopag promotes megakaryocyte colony formation from human CB CD34+ cells in a concentration-dependent fashion. The EC50 is 25 nM for Avatrombopag and the maximum activity of Avatrombopag is similar to that of rhTPO.
| Molecular Weight | 649.65 |
| Formula | C29H34Cl2N6O3S2 |
| CAS Number | 570406-98-3 |
| Solubility (25°C) | DMSO 8 mg/mL (ultrasonic and warming) |
| 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.
[2] No authors listed. Avatrombopag
[3] Anthony Markham. Drugs. Avatrombopag: A Review in Thrombocytopenia
[5] Matt Shirley. Drugs. Avatrombopag: First Global Approval
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