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Momelotinib (CYT387) is a small-molecule, ATP-competitive JAK1/JAK2 inhibitor with IC50 of 11 and 18 nM respectively. CYT387 inhibits growth of Ba/F3-JAK2V617F and human erythroleukemia (HEL) cells (IC (50) approximately 1500 nM) or Ba/F3-MPLW515L cells (IC (50)=200 nM), but has considerably less activity against BCR-ABL harboring K562 cells (IC50=58000 nM).
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Source | Pharmacol Res (2013). Figure 3. CYT387 |
| Method | orally | |
| Cell Lines | Mice | |
| Concentrations | 10 mg/kg | |
| Incubation Time | 24 h | |
| Results | Neither absence of Mdr1a/1bnor of Bcrp1 showed a significant effect on the overall plasma expo-sure between 0 and 8 h. |
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Source | Pharmacol Res (2013). Figure 2. CYT387 |
| Method | Transport assays | |
| Cell Lines | MDCK-II cells | |
| Concentrations | 5 μM | |
| Incubation Time | 2,4 and 8 h | |
| Results | In the MDCKII parental cell line, there was a mod-est apically directed transport of CYT387 (transport ratio r = 1.2),which was abrogated with the MDR1-specific inhibitor zosuquidar(Fig. 2A and B), suggesting that this background transport wasmediated by endogenous canine MDR1 present in the MDCKII cells. |
| Cell Experiment | |
|---|---|
| Cell lines | Ba/F3 cells expressing JAK2V617F (Ba/F3-JAK2V617F) and MPLW515L (Ba/F3–MPLW515L) mutants, as well as CHRF-288-11 (JAK2T875N) and CMK (JAK3A572V) cells |
| Preparation method | Cell-based assays. Ba/F3 cells expressing JAK2V617F (Ba/F3-JAK2V617F) and MPLW515L (Ba/F3–MPLW515L) mutants, as well as CHRF-288-11 (JAK2T875N) and CMK (JAK3A572V) cells were generously provided by D Gary Gilliland (Brigham and Women’s Hospital, Boston, MA, USA). The TEL/JAK2 and TEL/ JAK3 fusions were generated and introduced into Ba/F3 murine cells as described earlier. The TEL/JAK2- or TEL/JAK3-transfected cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) containing 10% fetal calf serum (FCS). Ba/F3 wild-type cells were cultured in RPMI containing 10% FCS supplemented with 5 ng/ml murine IL-3 (Peprotech, Rocky Hill, NJ, USA). Proliferation was measured using the Alamar Blue assay (TREK Diagnostic Systems, Cleveland, OH, USA) after incubating for 72 h at 37℃with 5% CO2. |
| Concentrations | 0~100μM |
| Incubation time | 72 h |
| Animal Experiment | |
|---|---|
| Animal models | murine model of JAK2V617F-dependent MPN |
| Formulation | dissolved in NMP (120 mg/mL final; 1-methyl-2-pyrrolidinone, Chromasolv Plus; Sigma-Aldrich). Subsequently, the CYT387/NMP mix was diluted with 0.14M Captisol (Cydex Pharmaceuticals Inc) to a concentration of 6 mg/mL and further diluted with 0.1M Captisol to a final concentration of 4 mg/mL. |
| Dosages | 25, 50mg/kg twice daily from day 34 to day 82 |
| Administration | oral gavage |
| Molecular Weight | 414.46 |
| Formula | C23H22N6O2 |
| CAS Number | 1056634-68-4 |
| Solubility (25°C) | DMSO 63 mg/mL |
| 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.
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