Molibresib (I-BET-762)
For research use only.
Catalog No.S7189 Synonyms: GSK525762, GSK525762A
15 publications
CAS No. 1260907-17-2
Molibresib (I-BET-762, GSK525762, GSK525762A) is an inhibitor for BET proteins with IC50 of ~35 nM in a cell-free assay, suppresses the production of proinflammatory proteins by macrophages and blocks acute inflammation, highly selective over other bromodomain-containing proteins.
2 Customer Reviews
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PECAPJ49 parental and cetuximab-resistant clones were treated with 100 nmol/L cetuximab ± 800 nmol/L I-BET-762(IBET) for 72 hours. Cells were stained with crystal violet and quantified as described in Materials and Methods (n = 3; *, P < 0.02). Figures are representative of three independent experiments.
Cancer Res, 2018, 78(15):4331-4343. Molibresib (I-BET-762) purchased from Selleck.
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A., B. and C. Dose response curves of MPNST-derived cell lines treated with three bromodomain inhibitors: JQ1, OTX015 and I-BET-762.
Oncotarget, 2016, 7(24):35753-35767. Molibresib (I-BET-762) purchased from Selleck.
Purity & Quality Control
Choose Selective Epigenetic Reader Domain Inhibitors
Biological Activity
| Description | Molibresib (I-BET-762, GSK525762, GSK525762A) is an inhibitor for BET proteins with IC50 of ~35 nM in a cell-free assay, suppresses the production of proinflammatory proteins by macrophages and blocks acute inflammation, highly selective over other bromodomain-containing proteins. | ||||||||||||||||
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| In vitro |
I-BET-762 is an inhibitor for BET (bromodomain and extra terminal domain) proteins, BRD2, BRD3 and BRD4, binds to the tandem bromodomains of BET with Kd of 50.5–61.3 nM, displaces a tetra-acetylated H4 peptide prebound to tandem bromodomains of BET with IC50 of 32.5–42.5 nM in FRET analysis. I-BET-762 occupies the acetyl-lysine binding pocket of BET proteins and inhibits binding of BET proteins to acetylated histones, thus disrupts the formation of the chromatin complexes essential for expression of inflammatory genes. [1] I-BET-762 treatment during the first 2 d of differentiation alters CD4+ T-cell cytokine production, up-regulated expression of several antiinflammatory gene products and down-regulated expression of several proinflammatory cytokines. [2] |
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| Assay |
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| In vivo | I-BET-762 confers protection against lipopolysaccharide-induced endotoxic shock and bacteria induced sepsisa. Single dose of I-BET applied at 1.5 h after LPS injection cures the mice. Twice-daily injections of I-BET for 2 days protects mice against death caused by sepsis. [1] Limited treatment with I-BET-762 exclusively during early priming inhibited the ability of Th1-differentiated 2D2 T cells to induce neuroinflammation in a mouse model of experimental autoimmune encephalomyelitis (EAE). [2] |
Protocol
| Kinase Assay:[1] |
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Fluorescence resonance energy transfer (FRET) titrations: Fluorescence resonance energy transfer (FRET) titrations. I-BET is titrated against BRD2 (200 nM), BRD3 (100 nM) and BRD4 (50 nM) in 50 mM HEPES pH7.5, 50 mM NaCl, 0.5 mM CHAPS in the presence of tetra-acetylated Histone H4 peptide (200 nM). After equilibrating for 1 hour, the bromodomain protein : peptide interaction is detected using FRET following the addition of 2nM Europium cryptate labelled streptavidin and 10 nM XL-665-labelled anti-6His antibody in assay buffer containing 0.05% (v/v) BSA and 400 mM KF. Plates are read using an Envision Plate reader (excitation 320 nm, emission 615 nm and 665 nm). |
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| Cell Research:[2] |
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| Animal Research:[1] |
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Solubility (25°C)
| In vitro | DMSO | 84 mg/mL (198.15 mM) |
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| Water | Insoluble | |
| Ethanol | '42 mg/mL warmed |
* 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 | 423.9 |
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| Formula | C22H22ClN5O2 |
| CAS No. | 1260907-17-2 |
| Storage |
powder in solvent |
| Synonyms | GSK525762, GSK525762A |
| Smiles | CCNC(=O)CC1C2=NN=C(N2C3=C(C=C(C=C3)OC)C(=N1)C4=CC=C(C=C4)Cl)C |
In vivo Formulation Calculator (Clear solution)
| Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment) | ||||||||||
| Dosage | mg/kg |  |
Average weight of animals | g | |
Dosing volume per animal | ul | |
Number of animals | |
| Step 2: Enter the in vivo formulation () | ||||||||||
| % DMSO % % Tween 80 % ddH2O | ||||||||||
| CalculateReset | ||||||||||
Calculation results:
Working concentration： mg/ml；
Method for preparing DMSO master liquid: ： mg drug pre-dissolved in μL DMSO (Master liquid concentration mg/mL，)
Method for preparing in vivo formulation：Take DMSO master liquid, next addμL PEG300， mix and clarify, next addμL Tween 80，mix and clarify, next add μL ddH2O，mix and clarify.
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.
Bio Calculators
Molarity Calculator
Calculate the mass, volume or concentration required for a solution. The Selleck molarity calculator is based on the following equation:
Mass (mg) = Concentration (mM) × Volume (mL) × Molecular Weight (g/mol)
*When preparing stock solutions, please always use the batch-specific molecular weight of the product found on the via label and MSDS / COA (available on product pages).
Dilution Calculator
Calculate the dilution required to prepare a stock solution. The Selleck dilution calculator is based on the following equation:
Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
This equation is commonly abbreviated as: C1V1 = C2V2 ( Input Output )
* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
Molecular Weight Calculator
Enter the chemical formula of a compound to calculate its molar mass and elemental composition:
Tip: Chemical formula is case sensitive. C10H16N2O2 c10h16n2o2
Instructions to calculate molar mass (molecular weight) of a chemical compound:
To calculate molar mass of a chemical compound, please enter its chemical formula and click 'Calculate'.
Definitions of molecular mass, molecular weight, molar mass and molar weight:
Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
Molarity Calculator
Clinical Trial Information
| NCT Number | Recruitment | interventions | Conditions | Sponsor/Collaborators | Start Date | Phases |
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| NCT03266159 | Withdrawn | Drug: GSK525762 Besylate tablets|Drug: Trametinib tablets | Solid Tumours | GlaxoSmithKline | November 27 2017 | Phase 2 |
| NCT02964507 | Active not recruiting | Drug: GSK525762|Drug: Placebo|Drug: Fulvestrant | Neoplasms | GlaxoSmithKline | February 2 2017 | Phase 2 |
| NCT01943851 | Completed | Drug: GSK525762 | Neoplasms | GlaxoSmithKline | May 14 2014 | Phase 2 |
| NCT01587703 | Completed | Drug: GSK525762 | Carcinoma Midline | GlaxoSmithKline | March 28 2012 | Phase 1 |
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.
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