Home DNA Damage/DNA Repair DNA/RNA Synthesis inhibitor CRT0044876 For research use only.

CRT0044876

Synonyms: NSC 69877,7-NO2-ICA

CRT0044876 (NSC 69877, 7-NO2-ICA) is a potent and selective APE1 inhibitor with IC50 of ~3 μM.

CRT0044876 Chemical Structure

CRT0044876 Chemical Structure

CAS No. 6960-45-8

Purity & Quality Control

Batch: S744901 DMSO]41 mg/mL]false]Ethanol]1 mg/mL]false]Water]Insoluble]false Purity: 99.55%
99.55

CRT0044876 Related Products

Signaling Pathway

DNA/RNA Synthesis Signaling Pathways

DNA/RNA Synthesis Signaling Pathway

Biological Activity

Description CRT0044876 (NSC 69877, 7-NO2-ICA) is a potent and selective APE1 inhibitor with IC50 of ~3 μM.
Targets
APE1 [1]
~3 μM
In vitro
In vitro CRT0044876 potently inhibits the AP endonuclease, 3'-phosphodiesterase and 3'-phosphatase activities of APE1, and exhibits the selectivity for the inhibition of exonuclease III family. CRT0044876 potentiates the cytotoxicity of several DNA base-targeting compounds with an accumulation of unrepaired AP sites. [1] CRT0044876, by inhibition of the BER pathway increases oxidative DNA damage temporally related to increased intracellular reactive oxygen species in an acidic tumor microenvironment, and thus results in cell cycle arrests and increased DNA double strand breaks, leading to cell death. [2]
Kinase Assay AP site cleavage assay
BER reaction buffer comprises 40 mM HEPES–KOH (pH 7.8), 5 mM MgCl2, 0.5 mM DTT and 0.1 mM EDTA. A 10 μl AP site cleavage reaction comprised of BER buffer mix, purified protein (3.3 nM final concentration of APE1) and 0.75 ng reduced AP site double-stranded oligonucleotide. The mixture is incubated at 37°C for 1 h. A total of 1 μl of stop buffer (50% glycerol, 10 mM Tris–HCl, 1 mM EDTA, 0.1% bromophenol blue and 0.1% Xylene cyanol) is added, and the sample mixture is denatured at 90–100°C for 2 min. The sample is then run on a 15% TBE Criterion™ Pre-Cast Gel, with electrophoresis at a constant current of 30 mA for 30 min, and the radiolabeled substrate and reaction products are visualized using a phosphorImager. The inhibitory activity of potential APE1-targeting compounds are analyzed at drug concentrations ranging from 0.1 to 100 μM. The resolved radiolabeled bands are quantified using ImageQuant software analysis, and IC50 values are calculated by determining the concentration of the inhibitor that reduced APE1 activity to 50% of the control values.
Cell Research Cell lines HT1080 fibrosarcoma cells
Concentrations 100-500 μM
Incubation Time 7-10 days
Method

HT1080 fibrosarcoma cells are grown in 2% RPMI medium [supplemented with penicillin 0.06 g/l, streptomycin 0.1 g/l (pH 7.0), 10% fetal bovine serum and 4 mM glutamine]. Only cells with a plating efficiency of ≥60% are used for clonogenic survival analysis. Tissue culture dishes (10 cm) are seeded with 500 cells per dish and the culture is maintained in a humidified incubator at 37°C in an atmosphere of 5% CO2 and 95% air. To evaluate the toxicity profile of putative APE1 inhibitors, various concentrations (100–500 μM) of inhibitor are added to the medium, and cultures were incubated for 7-10 days until cell colonies are formed. Colonies are fixed [75% (v/v) methanol, 25% (v/v) acetic acid] for 30 min and stained with crystal violet (1 mg/ml in distilled water) for 4 h at room temperature. Visible colonies are counted on a colony counter.

Chemical Information & Solubility

Molecular Weight 206.15 Formula

C9H6N2O4
CAS No. 6960-45-8 SDF --
Smiles C1=CC2=C(C(=C1)[N+](=O)[O-])NC(=C2)C(=O)O
Storage (From the date of receipt)

In vitro
Batch:

DMSO : 41 mg/mL ( (198.88 mM) Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Ethanol : 1 mg/mL

Water : Insoluble


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In vivo
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Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

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.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 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.

Tech Support

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.

Handling Instructions

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