For research use only.
CAS No. 1418308-27-6
EI1 is a potent and selective EZH2 inhibitor with IC50 of 15 nM and 13 nM for EZH2 (WT) and EZH2 (Y641F), respectively.
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EZH2 inhibitors EI1 or GSK343 are applied in MDA-MB-231 breast cancer cells with NBAT1 over-expression. The invasion suppression effects of NBAT1 was reversed by concomitant EZH2 inhibitors.
Oncotarget, 2015, 6(32):32410-25.. EI1 purchased from Selleck.
NBAT1 inhibits invasion of breast cancer cells via EZH2. a. Binding of NBAT1 to EZH2 complex in MDA-MB-231 cells, shown by RNA immunoprecipitation followed qRT-PCR (mean±SD, n=3, *** p < 0.001 versus lgG). b. Representative images of Boyden chamber assay for invaded cells. (Over-expression NBAT1 while inhibit EZH2 with EI1 or GSK343 in MDA-MB-231.) c. Histogram showing that the number of invaded cells with inhibited EZH2 was significantly higher than for DMSO, and similar to control groups (untreated, mock and vector, mean±SD, n=3, *** P < 0.001). d., e., qRT-PCR and western blot analysis for DKK1 in NBAT1-knockdown MCF7 cells inhibited EZH2 with EI1 or GSK343 or transfected with siRNA targeting EZH2 (NC, siEZH2-1 and siEZH2-2).
Oncotarget, 2015, 6(32): 32410-32425.. EI1 purchased from Selleck.
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Choose Selective Histone Methyltransferase Inhibitors
|Description||EI1 is a potent and selective EZH2 inhibitor with IC50 of 15 nM and 13 nM for EZH2 (WT) and EZH2 (Y641F), respectively.|
In DLBCL cells, EI1 inhibits cellular H3K27 methylation and activates Ezh2 target gene p16 expression. In mouse embryonic fibroblasts, EI1 also inhibit H3K27me3 and cell proliferation. In addition, EI1 selectively inhibits the growth of DLBCL cells carrying Ezh2 mutation, and causes cell cycle arrest and apoptosis. 
Biochemical Assay:For IC50 determination, EI1 is serial diluted threefold in DMSO for a total of 12 concentrations, with the starting concentration at 1 μM. The reaction is incubated at room temperature for 120 min, and stopped by adding quench solution (2.5% TFA with 320 nM d4-SAH). SAH production is quantitated using an API 4000 triple quadrupole mass spectrometry with Turbulon Spray coupled with Prominence UFLC. The percentage of inhibition is normalized using positive (no inhibitor) and negative (no enzyme) controls, and IC50 calculated using PRISM. Enzymology studies of S-Adenosyl methionine (SAM) competition are performed with slight modification of reaction condition: 10 μM EI1 is used as the starting dose for serial dilution. SAM is titrated over a range between 1 μM and 50 μM (corresponding to 1 × Km and 50 × Km), and substrate peptide is present in the final reaction mixture at its saturated condition (10 μM). For histone methyltransferase (HMT) profiling in Table 1, all HMTs are purified recombinant proteins from either Escherichia coli or Baculovirus system. The catalytic domain of G9a, SuV39H2, Set7/9, CARM1, SETD8, NSD3, SETD2, and Dot1L, and the full-length SmyD2 protein were used in the biochemical assays. HMT biochemical reactions are carefully characterized with enzymology studies and the SAM and substrate Km determined. The SAM and substrate concentrations are kept at their respective Km for most of the HMTs, except the ones (SmyD2 and Set7/9) with low SAM-Km value, for which 0.5 μM SAM is used. All HMT reactions are performed using the same assay format where the production of SAH from the biochemical reaction is quantitated by LC-MS.
|In vitro||DMSO||42 mg/mL warmed (107.55 mM)|
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