For research use only.
CAS No. 1346704-33-3
GSK343 is a potent and selective EZH2 inhibitor with IC50 of 4 nM in a cell-free assay, showing 60 fold selectivity against EZH1, and >1000 fold selectivity against other histone methyltransferases. GSK343 induces autophagy.
Selleck's GSK343 has been cited by 36 publications
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Choose Selective Histone Methyltransferase Inhibitors
|Description||GSK343 is a potent and selective EZH2 inhibitor with IC50 of 4 nM in a cell-free assay, showing 60 fold selectivity against EZH1, and >1000 fold selectivity against other histone methyltransferases. GSK343 induces autophagy.|
|Features||A chemical probe for the SGC epigenetics initiative. Potential use in a variety of solid tumors.|
GSK343 inhibits trimethylation of H3K27 (H3K27me3) with IC50 of 174 nM in HCC1806 breast cancer cells. GSK343 potently inhibits cell proliferation in breast cancer cells and prostate cancer cells, and the prostate cancer cell line LNCaP is the most sensitive to GSK343, with IC50 of 2.9 μM.  GSK343 significantly suppresses the growth of EOC cells cultured in 3D matrigel extracellular matrix (ECM), which mimics the tumor microenvironment in vivo. In addition, GSK343 also induces apoptosis of EOC cells in 3D and significantly inhibits the invasion of EOC cells. 
In vitro biochemical assays against histone methyltransferases:Activity against EZH2 is assessed using 5 member PRC2 complex (Flag-EZH2, EED, SUZ12, AEBP2, RbAp48). The assay protocol may be summarized as follows: 10 mM stocks of compounds are prepared from solid in 100% DMSO. An 11 point serial dilution master plate is prepared in 384 well format (1:3 dilution, columns 6 and 18 were equal volume DMSO controls) and dispensed to assay ready plates using acoustic dispensing technology to create a 100 nL stamp of compound and DMSO controls. The assay additions consisted of equal volume additions of 10 nM EZH2 and the substrate solution (5 µg/mL HeLa nucleosomes and 0.25 µM [3H]-SAM) dispensed into assay plates using a multi-drop combi dispense. Reaction plates are incubated for 1 hr and quenched with an equal volume addition of 0.5 mg/mL PS-PEI Imaging Beads (RPNQ0098) containing 0.1 mM unlabeled SAM. The plates are sealed, dark adapted for 30 minutes, and a 5 minute endpoint luminescence image is acquired using a Viewlux imager. Plate statistics such as Z’ and signal to background as well as dose response curves are analyzed using Activity BaseXE. The in vitro biochemical activity of EZH1 is assessed as part of a 5 member PRC2 complex using a 384 well SPA assay identical to EZH2. Buffer components, reagent dispensing, compound plate preparation, quench conditions and data analysis are identical for EZH1 and EZH2 with final assay concentrations of 20 nM EZH1, 5 μM/mL HeLa nucleosomes and 0.25 μM [3H]-SAM. Further data analysis, pIC50 pivots and visualizations are enabled by TIBCO Spotfire. Compounds are profiled at Reaction Biology Corp. (Malvern, PA) to assess inhibition in their panel of histone methyltransferase assays. Methyltransferase activity is assessed using HotSpot technology, a miniaturized radioisotope-based filter binding assay. Inhibitors are dissolved in dimethyl sulfoxide (DMSO) and tested at concentrations up to 100 uM with a final DMSO concentration of 2%. Buffer containing the methyltrasferase at the listed concentration and its preferred substrate as shown in the accompanying table is preincubated with compound for 10 min. Reactions are initiated by the addition of 1 uM S-adenosyl-L-[methyl-3H]methionine (SAM), allowed to incubate for 60 min at 30C followed by transfer to P81 filter-paper and PBS wash before detection.
|In vitro||Ethanol||4 mg/mL (7.38 mM)|
|DMSO||1 mg/mL warmed (1.84 mM)|
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
In vivo Formulation Calculator (Clear solution)
|Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)|
|Dosage||mg/kg||Average weight of animals||g||Dosing volume per animal||ul||Number of animals|
|Step 2: Enter the in vivo formulation ()|
|% DMSO % % Tween 80 % ddH2O|
Working concentration： mg/ml；
Method for preparing DMSO master liquid: ： mg drug pre-dissolved in μL DMSO (Master liquid concentration mg/mL，)
Method for preparing in vivo formulation：Take μL DMSO master liquid, next addμL PEG300， mix and clarify, next addμL Tween 80，mix and clarify, next add μL ddH2O，mix and clarify.
1.Please make sure the liquid is clear before adding the next solvent.
2.Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such as vortex, ultrasound or hot water bath can be used to aid dissolving.
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Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.
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