Abatacept is a soluble fusion protein consisting of the extra-cellular domain of human CTLA4 and a fragment of the Fc portion of human IgG1. Abatacept binds to antigen presenting cells CD80 and CD86, blocks costimulatory signals and inhibits T cell activation, and is used in the study of rheumatoid arthritis and juvenile rheumatoid arthritis.
| CAS Number | 332348-12-6 |
| Form | Solid |
| Storage | 4°C, protect from light, do not freeze. |
| 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.
[5] Hannah A Blair, et al. Drugs. Abatacept: A Review in Rheumatoid Arthritis
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