Molecular Weight(MW): 412.51
AZ20 is a novel potent and selective inhibitor of ATR kinase with IC50 of 5 nM in a cell-free assay, 8-fold selectivity over mTOR.
Cited by 16 Publications
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(c) AML cell lines and primary patient sample AML#53 were treated with AZ20 for 24 h and then subjected to annexin V-FITC/PI staining and flow cytometry analyses. Mean percent annexin V + cells ± SEM from one representative experiment performed in triplicates are shown. For cell lines, experiments were repeated three times, while patient sample experiments were performed once due to limited available sample.
Sci Rep, 2017, 7:41950. AZ20 purchased from Selleck.
A. HeLa cells were first exposed for 1 hour to either no drug (black diamond) or a combination of 2 μM KU-60019 and 1 μM VE-821 (white circle) before addition of either trabectedin (left panel) or lurbinectedin (right panel) at the indicated concentrations. B. HeLa cells were first exposed for 1 hour to either no drug (black diamond) or a combination of 2 μM KU-60019 and 0.2 μM AZ20 (white circle) before addition of either trabectedin (left panel) or lurbinectedin (right panel) at the indicated concentrations. Both combinations of checkpoint abrogators, that is 2 μM KU-600019 with 1 μM VE-821 and 2 μM KU-600019 with 0.2 μM AZ20 have minor cytotoxic activity (
Oncotarget, 2016, 7(18):25885-901. AZ20 purchased from Selleck.
AZ20 enhances GEM-induced DNA damage in pancreatic cancer cells. (A and B) BxPC-3 and HPAC cells were treated with 1 µM AZ20 and 80 nM GEM alone or simultaneously for 8 h. Whole cell lysates were subjected to western blotting and probed with anti-PARP-1, -γH2AX, -p-CHK1, -CHK1, -p-CDC25C, -p-CDK1, -CDK1, -p-CDK2, -CDK2, -RRM1, -RRM2 or -GAPDH antibody. (C) Relative RRM2 protein levels are graphed as means ± standard errors from 3 independent experiments. (D and E) BxPC-3 and HPAC cells were treated with 1 µM AZ20 and 80 nM GEM alone or simultaneously for 8 h, and then the cells were subjected to alkaline comet assay. Representative comets are shown. (F and G) Comet assay results are graphed as the median percentage of DNA in the tail from 3 replicate gels ± SEM; ***p<0.001 (GEM vs. control), ##p<0.005 (combo vs. GEM), ###p<0.001 (combo vs. GEM).
Oncol Rep, 2018, 37(6):3377-3386. AZ20 purchased from Selleck.
Purity & Quality Control
Choose Selective ATM/ATR Inhibitors
|Description||AZ20 is a novel potent and selective inhibitor of ATR kinase with IC50 of 5 nM in a cell-free assay, 8-fold selectivity over mTOR.|
|Features||ATR-selective inhibitor with high permeability and good stability.|
AZ20 shows good selectivity against all of the PI3K isoforms together with ATM and DNA-PK.  In vitro, AZ20 decreases pChk1 Ser345, pChk1 Ser317 and pChk1 Ser296 levels in a concentration-dependent manner. Prolonged exposure with AZ20 increases γH2AX pan-nuclear staining, indicative of replication stress. This is associated with S-phase arrest and increase in phospho-histone H3. AZ20 induces growth inhibition and cell death in vitro and its profile of activity is distinct from other cytotoxic agents. The cytotoxic effect of AZ20 can be increased in combination with the selective ATM inhibitor KU-60019. 
|In vivo||Female nude mice bearing LoVo tumors are treated with AZ20 orally at a dose of 25 mg/kg twice daily or 50 mg/kg once daily for 13 days, led to significant tumor growth inhibition.  This is associated with a persistent elevation of γH2AX pan-nuclear staining in xenograft tissue, but a transient increase in mouse bone marrow at therapeutic doses, suggesting a favourable therapeutic index.  AZ20 is assessed for drug−drug interaction (DDI) potential specifically from inhibition of cytochrome P450 enzymes. AZ20 is found to inhibit the cytochrome 3A4-mediated metabolism of midazolam by 50% at 10 μM. AZ20 has respectable bioavailability in a low dose rat PK study. |
|In vitro||DMSO||83 mg/mL (201.2 mM)|
|Ethanol||3 mg/mL (7.27 mM)|
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Frequently Asked Questions
If I want to completely block the kinase activity from the in vitro cell lines, how much concentration I should use?
IC50 5nM was quoted from a previous publication in which the author tested IC50 of AZ20 in cell free assay. In cell culture, many factors, such as membrane permeability and target protein concentration, may affect the efficiency. Each cell line responses to the same compound differently and it is very difficult to predict the optimized concentration simply based on cell free data. In cell culture experiment, the required concentration is usually higher. We recommend that you perform a pilot experiment and test different concentrations (50nM to 500uM) to get the optimized condition.