Seletalisib (UCB5857) is a potent and selective PI3Kδ inhibitor, with IC50 of 12 nM. Seletalisib blocks human T-cell production of several cytokines from activated T-cells. Seletalisib inhibits T-cell differentiation to Th1, Th2, and Th17 subtypes. In human whole blood assays, Seletalisib inhibits CD69 expression upon B-cell activation and anti-IgE-mediated basophil degranulation. Seletalisib significantly inhibits IL-2 release following TCR stimulation in the rat.
|Cell lines||Ramos B-cell line|
|Preparation method||Serially diluted seletalisib and goat anti-human F(ab)2 IgM in serum-free RPMI 1640 were added to Ramos cells plated in serum-free RPMI 1640. The plate was incubated for 10 minutes, chilled on ice, and the cells pelleted by centrifugation. Cellular phosphorylated AKT was detected by MSD assay.|
|Concentrations||0.1 nM-10 μM|
|Incubation time||10 min|
|Animal models||Adult Lewis rats (male, 6-8 weeks of age)|
|Formulation||methylcellulose (0.5%, 400 cps)|
|Dosages||0.1-10 mg/kg in 500 μL volume|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|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.
|Solubility||DMSO 85 mg/mL|
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