Catalog No.S2197

For research use only.

A-966492 is a novel and potent inhibitor of PARP1 and PARP2 with Ki of 1 nM and 1.5 nM, respectively.

A-966492 Chemical Structure

CAS No. 934162-61-5

Selleck's A-966492 has been cited by 9 Publications

2 Customer Reviews

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Biological Activity

Description A-966492 is a novel and potent inhibitor of PARP1 and PARP2 with Ki of 1 nM and 1.5 nM, respectively.
Features A promising, structurally diverse benzimidazole analogue that is being further characterized preclinically.
PARP1 [1]
(Cell-free assay)
PARP1 [1]
(a whole cell assay)
PARP2 [1]
(Cell-free assay)
1 nM(Ki) 1 nM(EC50) 1.5 nM(Ki)
In vitro

A-966492 is one of the most potent PARP inhibitors. A-966492 displays excellent potency against the PARP-1 enzyme with a Kiof 1 nM and an EC50 of 1 nM in a whole cell assay. A-966492 significantly enhances the efficacy of TMZ in a dose-dependent manner. In addition, A-966492 is orally bioavailable across multiple species, crosses the blood−brain barrier, and appears to distribute into tumor tissue. A-966492 represents a promising, structurally diverse benzimidazole analogue and is being further characterized preclinically. [1]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
C41 cells MV7GeY5kfGmxbjDhd5NigQ>? NYHSR4JtUW6qaXLpeIlwdiCxZjDQRXJROSCrbjDoeY1idiCFNEGgZ4VtdHNiYomgSmlVSy2lb37qeYdifGWmIFTBVGkhe3SjaX7pcoctKEWFNUC9NE4xODFizszN Mn60NlA{Ozd|N{G=
In vivo A-966492 also demonstrates good in vivo efficacy in a B16F10 subcutaneous murine melanoma model in combination with temozolomide and in an MX-1 breast cancer xenograft model both as a single agent and in combination with carboplatin. In addition, A-966492 has excellent pharmaceutical properties and has demonstrated in vivo efficacy in preclinical mouse tumor models in combination with TMZ and carboplatin, as well as single agent activity in a BRCA1-deficient MX-1 tumor model. A-966492 is further characterized in Sprague−Dawley rats, beagle dogs, and cynomolgus monkeys, with A-966492 demonstrating oral bioavailabilities of 34−72% and half-lives of 1.7−1.9 hours. In vivo, A-966492 demonstrates significant enhancement of the efficacy of TMZ in a murine B16F10 syngeneic melanoma model, with the A-966492 combination groups showing superior efficacy. [1]

Protocol (from reference)

Kinase Assay:


  • PARP Enzyme Assay:

    The enzyme assay is conducted in buffer containing 50 mM Tris, pH 8.0, 1 mM dithiothreitol(DTT), and 4 mM MgCl2. PARP reactions contains 1.5 μM [3H]-NAD+ (1.6 μCi/mmol), 200 nM biotinylated histone H1, 200 nM slDNA, and 1 nM PARP-1 or 4 nM PARP-2 enzyme. Autoreactions utilizing SPA bead-based detection are carried out in 100 μL volumes in white 96-well plates. Reactions are initiated by adding 50 μL of 2X NAD+ substrate mixture to 50 μL of 2× enzyme mixture containing PARP and DNA. These reactions are terminated by the addition of 150 μL of 1.5 mM benzamide (∼1 × 103-fold over its IC50). A 170 μL amount of the stopped reaction mixtures is transferred to streptavidin-coated Flash Plates, incubated for 1 hour, and counted using a TopCount microplate scintillation counter. Ki data are determined from inhibition curves at various substrate concentrations.

Cell Research:


  • Cell lines: C41 cell
  • Concentrations: ~10 nM
  • Incubation Time: 30 minutes
  • Method:

    C41 cells are treated with A-966492 for 30 minutes in a 96-well plate. PARP are activated by damaging DNA with 1 mM H2O2 for 10 minutes. Cells are washed with ice-cold phosphate-buffered saline (PBS) once and fixed with prechilled methanol/acetone (7:3) at -20 °C for 10 minutes. After they are air-dried, plates are rehydrated with PBS and blocked using 5% nonfat dry milk in PBS-Tween(0.05%) (blocking solution) for 30 minutes at room temperature. Cells are incubated with anti-PAR antibody 10H (1:50) in blocking solution at room temperature for 60 minutes followed by washing with PBS-Tween20 five times, and incubation with goat antimouse fluorescein 5(6)-isothiocyanate (FITC)-coupled antibody (1:50) and 1 μg/mL 40,6-diamidino-2-phenylindole (DAPI) in blocking solution at room temperature for 60 minutes. After washing with PBS-Tween20 5 times, analysis is performed using an fmax Fluorescence Microplate Reader set at the excitation and emission wavelength for FITC or the excitation and emission wavelength for DAPI. PARP activity (FITC signal) is normalized with cell numbers (DAPI).

Animal Research:


  • Animal Models: A 0.2 cc amount of a 1:10 dilution of tumor brei in 45% Matrigel and 45% Spinner MEM is injected subcutaneously into the flank of female SCID mice.
  • Dosages: 12.5, 25, and 50 mg/kg/day, for 14 days
  • Administration: Orally administrated

Solubility (25°C)

In vitro

DMSO 64 mg/mL warmed
(197.31 mM)
Water Insoluble
Ethanol Insoluble

Chemical Information

Molecular Weight 324.35


CAS No. 934162-61-5
Storage 3 years -20°C powder
2 years -80°C in solvent
Smiles C1CC(NC1)C2=CC(=C(C=C2)C3=NC4=C(C=CC=C4N3)C(=O)N)F

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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.

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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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Frequently Asked Questions

Question 1:
how long is a half-life of A966492 drug?

Sorry, Selleck don't have such information of this compound. But based on the reference: http://www.ncbi.nlm.nih.gov/pubmed/20337371, A966492 may have half-life of 1.7−1.9 hours. “with A-966492 demonstrating oral bioavailabilities of 34−72% and half-lives of 1.7−1.9 hours (in vivo)” which is cited from the reference.

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