Sarilumab is a human recombinant IgG1 antibody that binds to both forms of interleukin 6 receptors (IL-6R), thus inhibiting the IL-6-mediated signaling. IL-6 is known to be a pleiotropic cytokine that activates immune cells (T and B cells), as well as hepatocytes for the release of acute phase proteins like CRP, serum amyloid A and fibrinogen which are biomarkers of RA activity. IL-6 is also found in synovial fluid and plays a major role in the pathological inflammation and joint destruction features of RA. Sarilumab is used for the treatment of RA due to its ability to inhibit intra-articular and systemic IL-6 signaling.
| Formula | C6388H9918N1718O1998S44 |
| CAS Number | 1189541-98-7 |
| Solubility (25°C) | PBS buffer |
| Storage | 4°C, protect from light |
| 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] Sajad Khiali, et al. A comprehensive review on sarilumab in COVID-19
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