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CPI-203 is a potent, selective and cell permeable inhibitor of the bromodomain and extra terminal (BET) family protein BRD4 with an IC50 of ~37 nM. CPI-203 inhibits BRD4 in vitro and in cells, but it does not affect BRD4 kinase activity in vitro. CPI203 exerts a cytostatic effect in all the 9 MCL cell lines analyzed with GI50 ranging from 0.06 to 0.71 μM), with low cytotoxicity in normal PBMCs from healthy donors. CPI-203 arrests the growth of leukemic T cells in vitro (EC50 = 91 nM) and rapidly suppresses leukemia burden in mice. In contrast, in vivo, specific Ser2 phosphorylation by either endogenous BRD4 or exogenous BRD4 FEE-AAA was markedly decreased by treatment with the inhibitor.
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Source | Genes Dev (2015). Figure 6. CPI-203 |
| Method | qRT–PCR | |
| Cell Lines | LSK CD150+ CD48− HSCs | |
| Concentrations | 0.5 μM | |
| Incubation Time | 24 h | |
| Results | As expected, MycmRNAwas reduced by twofold to threefold compared with mock-treated HSCs in both groups, while there was no difference in Myc expression between the Erg+/− and Erg+/+ groups |
| Cell Experiment | |
|---|---|
| Cell lines | 2 PBMC cultures from healthy donors and 9 MCL cell lines (Granta-519, JVM-2, UPN1, Z-138, JeKo-1, ZBR, JBR, Mino, REC-1 cells) |
| Preparation method | Incubating MCL primary cells and cell lines as indicated with lenalidomide and/or CPI203. Adding MTT for 2-6 additional hours before spectrophotometric measurement. Each measurement is made in triplicate. Using untreated control cells to represent values . The GI50 is calculated as the concentration that produced 50 % growth inhibition. Using the Calcusyn software version 2.0 to calculate Combination indexes (CIs) . When CI <1 ,the interaction between two drugs is considered synergistic. |
| Concentrations | 10 μM |
| Incubation time | 72 hours |
| Animal Experiment | |
|---|---|
| Animal models | REC-1 tumor-bearing mice |
| Formulation | |
| Dosages | 2.5 mg/kg twice daily |
| Administration | i.p |
| Molecular Weight | 399.9 |
| Formula | C19H18ClN5OS |
| CAS Number | 1446144-04-2 |
| Solubility (25°C) | DMSO ≥ 40 mg/mL (warmed) |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
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| BAY-155
BAY-155 is a potent and selective menin-MLL tool inhibitor, with an IC50 of 8 nM. |
| FHT-1015
FHT-1015 is a potent SMARCA4/SMARCA2 ATPase (BRG1 and BRM) inhibitor with IC50s of ≤10 nM. |
| ISOX-DUAL
ISOX-DUAL is a dual CBP/BRD4 inhibitor with IC50 values of 0.65 μM and 1.5 μM for CBP and BRD4, respectively. |
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