In vitro: Treatment with EPZ020411 results in a dose-dependent decrease in H3R2 methylation in A375 human melanoma cells exogenously overexpressing PRMT6(IC50=0.637±0.241 μM). In biochemical assays EPZ020411 is over 100-fold selective for PRMT6/8/1 compared to other histone methyltransferases including four arginine methyltransferases (PRMT3, PRMT4, PRMT5, and PRMT7). The compound shows poor permeability in the parallel artificial membrane permeation assay. In vivo: EPZ020411 shows good bioavailability following subcutaneous dosing in rats making it a suitable tool for in vivo studies. Male Sprague-Dawley rats administered a single dose of EPZ020411 at 1 mg/kg by i.v. bolus show a moderate clearance (CL) of 19.7±1.0 mL/min/kg, with a volume of distribution at steady state (Vss) of 11.1±1.6 L/kg, translating to a mean terminal half-life (t1/2) of 8.54±1.43 h. Following 5 mg/kg s.c. dosing, a good bioavailability of 65.6 ± 4.3% is observed, leading to EPZ020411 unbound blood concentration remaining above the PRMT6 biochemical IC50 value for more than 12 h.
|Cell lines||A375 cells|
|Preparation method||A375 (CRL-1619) cells are cultured in DMEM plus 10% (vol/vol) FBS. PRMT6 is cloned into BamHI and EcoRI sites of a pcDNA4 HisMAX_A plasmid. Transfection of his-tagged PRMT6 or vector control is carried out using Lipofectamine LTX and Plus reagent according to procedures recommended by the manufacturer. Cells are seeded at 200,000 cells/well in 6-well plates. The following day, the cells are concurrently transfected and treated with compound in 0.25% DMSO. Cells are incubated in the presence of increasing concentrations of compound up to 20 μM. Cell pellets are collected after 48 hours of compound treatment.|
|Incubation time||48 h|
|Animal models||Sprague-Dawley rats|
|Formulation||saline, pH 6.5|
|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 resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 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 resveratrol of 11.2 mg/kg.
|Solubility||100 mg/mL in DMSO|
Aryl Pyrazoles as Potent Inhibitors of Arginine Methyltransferases: Identification of the First PRMT6 Tool Compound.
Mitchell LH, et al. ACS Med Chem Lett. 2015 Apr 6;6(6):655-9. PMID: 26101569.
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