Molibresib (I-BET-762)

Catalog No.S7189 Batch:S718901

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Technical Data

Formula

C22H22ClN5O2
Molecular Weight 423.9 CAS No. 1260907-17-2
Solubility (25°C)* In vitro DMSO 85 mg/mL (200.51 mM)
Ethanol 85 mg/mL (200.51 mM)
Water 11 mg/mL (25.94 mM)
* <1 mg/ml means slightly soluble or 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.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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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.
Targets
BET proteins [1]
(Cell-free assay)
35 nM
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]
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 (from reference)

Kinase Assay:[1]
  • 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).
Cell Assay:[2]
  • Cell lines

    CD4+ T cells

  • Concentrations

    ~500 nM

  • Incubation Time

    60–72 h

  • Method

    CD4+ T cells are isolated from lymph nodes and spleens of 10- to 12-wk old mice and activated with plate bound anti-CD3 and anti-CD28 antibodies in the presence of indicated cytokines. I-BET-762 compounds is included during the 60–72 h of initial activation. Over the course of 5 d of T-cell culture and expansion, the compounds is diluted 12-fold relative to the starting concentrations.
Animal Study:[1]
  • Animal Models

    Mouse

  • Dosages

    30 mg/kg

  • Administration

    i.v.

Customer Product Validation

Data from [Data independently produced by , , Cancer Res, 2018, 78(15):4331-4343]

Data from [Data independently produced by , , Oncotarget, 2016, 7(24):35753-35767]

Selleck's Molibresib (I-BET-762) has been cited by 41 publications

Combination drug screen targeting glioblastoma core vulnerabilities reveals pharmacological synergisms [ EBioMedicine, 2023, 95:104752] PubMed: 37572644
Combination drug screen targeting glioblastoma core vulnerabilities reveals pharmacological synergisms [ EBioMedicine, 2023, 95:104752] PubMed: 37572644
Regulation of the WNT-CTNNB1 signaling pathway by severe fever with thrombocytopenia syndrome virus in a cap-snatching manner [ mBio, 2023, e0168823.] PubMed: 37882780
High-Content and High-Throughput Clonogenic Survival Assay Using Fluorescence Barcoding [ Cancers -Basel), 2023, 15(19)4772] PubMed: 37835466
Pan-cancer analysis of super enhancer-induced PRR7-AS1 as a potential prognostic and immunological biomarker [ Front Genet, 2023, 14:1160599] PubMed: 37091809
Proteogenomics refines the molecular classification of chronic lymphocytic leukemia [ Nat Commun, 2022, 13(1):6226] PubMed: 36266272
Proteogenomics refines the molecular classification of chronic lymphocytic leukemia [ Nat Commun, 2022, 13(1):6226] PubMed: 36266272
BRD4 promotes resection and homology-directed repair of DNA double-strand breaks [ Nat Commun, 2022, 13(1):3016] PubMed: 35641523
Drug-microenvironment perturbations reveal resistance mechanisms and prognostic subgroups in CLL [ Mol Syst Biol, 2022, 18(8):e10855] PubMed: 35959629
Breaking boundaries: Pan BETi disrupt 3D chromatin structure, BD2-selective BETi are strictly epigenetic transcriptional regulators [ Biomed Pharmacother, 2022, 152:113230] PubMed: 35687908

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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