GSK1324726A (I-BET726)

For research use only.

Catalog No.S7620

4 publications

GSK1324726A (I-BET726) Chemical Structure

CAS No. 1300031-52-0

GSK1324726A (I-BET726) is a highly selective inhibitor of BET family proteins with IC50 of 41 nM, 31 nM, and 22 nM for BRD2, BRD3, and BRD4, respectively.

Selleck's GSK1324726A (I-BET726) has been cited by 4 publications

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Biological Activity

Description GSK1324726A (I-BET726) is a highly selective inhibitor of BET family proteins with IC50 of 41 nM, 31 nM, and 22 nM for BRD2, BRD3, and BRD4, respectively.
BRD4 [1]
(Cell-free assay)
BRD3 [1]
(Cell-free assay)
BRD2 [1]
(Cell-free assay)
22 nM 31 nM 41 nM
In vitro

In neuroblastoma cell lines, GSK1324726A inhibits cell growth and induces cytotoxicity. GSK1324726A also modulates expression of genes involved in apoptosis, signaling, and MYC-family pathways, including the direct suppression of BCL2 and MYCN. [1]

In vivo In the mouse SK–N-AS and CHP-212 models, GSK1324726A (15 mg/kg p.o.) results in tumor growth inhibition and down-regulation MYCN and BCL2 expression. [1] In a mouse septic shock model, GSK1324726A (10 mg/kg i.v.) shows potent anti-inflammatory effects, and prevents death of diseased animals. [2]


Kinase Assay:[1]
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Determination of BET Protein Binding Affinities to I-BET726:

For determination of binding affinities to BET protein bromodomains, I-BET726 is titrated against truncates containing both BD1 and BD2 of BRD2 (10 nM), BRD3 (10 nM), and BRD4 (10 nM) in 50 mM HEPES pH7.5, 150 mM NaCl, 5% Glycerol, 1 mM DTT and 1 mM CHAPS in the presence of an Alexa 647 derivative (50 nM) of fluorescent ligand. After equilibrating for 1 h, the bromodomain protein: ligand interaction is detected using Time Resolved Fluorescence Resonance Energy Transfer (TR-FRET) following the addition of 1.5 nM europium chelate labeled anti-6His antibody. Plates are read using an Envision Plate reader (λEX = 337 nm, λEM = 615 nm, λEM = 665 nm; dual dichroic = 400 nm & 630 nm). These data are fitted to a four parameter IC50 model using Graphit data analysis software.
Cell Research:[1]
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  • Cell lines: LA-N-1, Kelly, LA1-55n, BE(2)-M17, BE(2)-C, KanTS, IMR32, LA-N-2, SK-N-SH, SK-N-BE(2), CHP-134, SK-N-AS, SH-SY5Y, SK-N-FI, CHP-212, LA1-5s, SK-N-DZ cells
  • Concentrations: ~10 μM
  • Incubation Time: 6 days
  • Method: Briefly, cells are seeded into 384-well or 96-well plates at a density optimized for 6 days of growth. The following day, T0 measurements are taken using CellTiter-Glo, CellTiter-Fluor, or CyQuant Direct, following the manufacturer’s instructions. Plates are read on an Envision, Safire 2, or SpectraMax Gemini EM plate reader. Remaining plates are treated with DMSO or a titration of I-BET726. Cells are incubated for 6 days and developed as described above. Results are plotted as a percentage of the T0 value, normalized to 100%, versus concentration of compound. A 4-parameter equation is used to generate concentration response curves. Growth IC50 (gIC50) values are calculated at the mid-point of the growth window (between DMSO and T0 values). Ymin-T0 values are calculated by subtracting the T0 value (100%) from the Ymin value on the curve, and are a measure of net population cell growth or death.
    (Only for Reference)
Animal Research:[1]
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  • Animal Models: Xenograft models of non-MYCN-amplified and MYCN-amplified neuroblastoma in immunocompromised mice using the SK–N-AS and CHP-212 cell lines
  • Dosages: 15 mg/kg once daily
  • Administration: p.o.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 86 mg/mL (197.74 mM)
Ethanol 86 mg/mL (197.74 mM)
Water Insoluble

* 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.

Chemical Information

Molecular Weight 434.91


CAS No. 1300031-52-0
Storage powder
in solvent
Synonyms N/A
Smiles CC1CC(C2=C(N1C(=O)C)C=CC(=C2)C3=CC=C(C=C3)C(=O)O)NC4=CC=C(C=C4)Cl

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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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Epigenetic Reader Domain Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID