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(Synonyms: iBET-BD2) 目录号 : GC60182

A BD2 bromodomain inhibitor

GSK046 Chemical Structure

Cas No.:2474876-09-8

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5mg
¥2,385.00
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10mg
¥3,825.00
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25mg
¥7,650.00
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50mg
¥12,240.00
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100mg
¥19,875.00
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产品描述

iBET-BD2 is an inhibitor of the bromodomain and extra-terminal domain (BET) family protein bromodomain 2 (BD2).1 It inhibits BD2 in bromodomain-containing protein 2 (BRD2), BRD3, BRD4, and BRDT (IC50s = 264, 98, 49, and 214 nM, respectively) and is selective for BD2 over BD1 (IC50s = 10.96, 36.31, 70.55, and >50.11 ?M for BRD2, BRD3, BRD4, and BDT, respectively) in a time-resolved FRET (TR-FRET) assay. iBET-BD2 (1 ?M) inhibits IFN-γ-induced protein expression of MHC class I in K562 cells. It reduces the production of anti-KLH IgM antibodies in mice immunized with keyhole limpet hemocyanin (KLH) when administered at a dose of 40 mg/kg.

1.Gilan, O., Rioja, I., Knezevic, K., et al.Selective targeting of BD1 and BD2 of the BET proteins in cancer and immuno-inflammationScience368(6489)387-394(2020)

Chemical Properties

Cas No. 2474876-09-8 SDF
别名 iBET-BD2
Canonical SMILES O=C(N[C@H]1CC[C@H](O)CC1)C2=CC(O[C@H](C3=CC=CC=C3)C)=C(NC(C)=O)C(F)=C2
分子式 C23H27FN2O4 分子量 414.47
溶解度 储存条件 Store at -20°C
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1 mM 2.4127 mL 12.0636 mL 24.1272 mL
5 mM 0.4825 mL 2.4127 mL 4.8254 mL
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Research Update

Selective inhibitors of bromodomain BD1 and BD2 of BET proteins modulate radiation-induced profibrotic fibroblast responses

Int J Cancer 2022 Jul 15;151(2):275-286.PMID:35239184DOI:10.1002/ijc.33989.

Radiotherapy can induce various adverse effects including fibrosis in cancer patients. Radiation-induced aberrant expression of profibrotic genes has been associated with dysregulated epigenetic mechanisms. Pan-BET (bromodomain and extraterminal domain) inhibitors, such as JQ1 and I-BET151, have been reported to attenuate the profibrotic response after irradiation. Despite their profound preclinical efficacy, the clinical utility of pan-inhibitors is limited due to observed cytotoxicicities. Recently, inhibitors were developed that selectively target the first (BD1) and second (BD2) bromodomain of the BET proteins (iBET-BD1 [GSK778] and iBET-BD2 [GSK046]). Here, their potential to attenuate radiation-induced fibroblast activation with low-toxicity was investigated. Our results indicated that cell proliferation and cell cycle progression in fibroblasts from BJ cells and six donors were reduced when treated with I-BET151 and iBET-BD1, but not with iBET-BD2. After irradiation, induction of DGKA and profibrotic markers, especially COL1A1 and ACTA2, was attenuated with all BET inhibitors. H3K27ac enrichment was similar at the DGKA enhancer region after I-BET151 treatment and irradiation, but was reduced at the COL1A1 transcription start site and the ACTA2 enhancer site. iBET-BD2 did not change H3K27ac levels in these regions. BRD4 occupancy at these regions was not altered by any of the compounds. Cell migration activity was measured as a characteristic independent of extracellular matrix production and was unchanged in fibroblasts after irradiation and BET inhibitor-treatment. In conclusion, iBET-BD2 efficiently suppressed radiation-induced expression of DGKA and profibrotic markers without showing cytotoxicity. Thus BD2-selective targeting is a promising new therapeutic avenue for further investigations to prevent or attenuate radiotherapy-induced fibrosis.

Mining the transcriptome of target tissues of autoimmune and degenerative pancreatic β-cell and brain diseases to discover therapies

iScience 2022 Oct 17;25(11):105376.PMID:36345338DOI:10.1016/j.isci.2022.105376.

Target tissues of autoimmune and degenerative diseases show signals of inflammation. We used publicly available RNA-seq data to study whether pancreatic β-cells in type 1 and type 2 diabetes and neuronal tissue in multiple sclerosis and Alzheimer's disease share inflammatory gene signatures. We observed concordantly upregulated genes in pairwise diseases, many of them related to signaling by interleukins and interferons. We next mined these signatures to identify therapies that could be re-purposed/shared among the diseases and identified the bromodomain inhibitors as potential perturbagens to revert the transcriptional signatures. We experimentally confirmed in human β-cells that bromodomain inhibitors I-BET151 and GSK046 prevent the deleterious effects of the pro-inflammatory cytokines interleukin-1β and interferon-γ and at least some of the effects of the metabolic stressor palmitate. These results demonstrate that key inflammation-induced molecular mechanisms are shared between β-cells and brain in autoimmune and degenerative diseases and that these signatures can be mined for drug discovery.

Discovery of a Highly Selective BET BD2 Inhibitor from a DNA-Encoded Library Technology Screening Hit

J Med Chem 2021 Aug 12;64(15):10806-10833.PMID:34251219DOI:10.1021/acs.jmedchem.1c00412.

Second-generation bromodomain and extra terminal (BET) inhibitors, which selectively target one of the two bromodomains in the BET proteins, have begun to emerge in the literature. These inhibitors aim to help determine the roles and functions of each domain and assess whether they can demonstrate an improved safety profile in clinical settings compared to pan-BET inhibitors. Herein, we describe the discovery of a novel BET BD2-selective chemotype using a structure-based drug design from a hit identified by DNA-encoded library technologies, showing a structural differentiation from key previously reported greater than 100-fold BD2-selective chemotypes GSK620, GSK046, and ABBV-744. Following a structure-based hypothesis for the selectivity and optimization of the physicochemical properties of the series, we identified 60 (GSK040), an in vitro ready and in vivo capable BET BD2-inhibitor of unprecedented selectivity (5000-fold) against BET BD1, excellent selectivity against other bromodomains, and good physicochemical properties. This novel chemical probe can be added to the toolbox used in the advancement of epigenetics research.

Template-Hopping Approach Leads to Potent, Selective, and Highly Soluble Bromo and Extraterminal Domain (BET) Second Bromodomain (BD2) Inhibitors

J Med Chem 2021 Mar 25;64(6):3249-3281.PMID:33662213DOI:10.1021/acs.jmedchem.0c02156.

A number of reports have recently been published describing the discovery and optimization of bromo and extraterminal inhibitors which are selective for the second bromodomain (BD2); these include our own work toward GSK046 (3) and GSK620 (5). This paper describes our approach to mitigating the genotoxicity risk of GSK046 by replacement of the acetamide functionality with a heterocyclic ring. This was followed by a template-hopping and hybridization approach, guided by structure-based drug design, to incorporate learnings from other BD2-selective series, optimize the vector for the amide region, and explore the ZA cleft, leading to the identification of potent, selective, and bioavailable compounds 28 (GSK452), 39 (GSK737), and 36 (GSK217).

Identification of a Series of N-Methylpyridine-2-carboxamides as Potent and Selective Inhibitors of the Second Bromodomain (BD2) of the Bromo and Extra Terminal Domain (BET) Proteins

J Med Chem 2021 Aug 12;64(15):10742-10771.PMID:34232650DOI:10.1021/acs.jmedchem.0c02155.

Domain-specific BET bromodomain ligands represent an attractive target for drug discovery with the potential to unlock the therapeutic benefits of antagonizing these proteins without eliciting the toxicological aspects seen with pan-BET inhibitors. While we have reported several distinct classes of BD2 selective compounds, namely, GSK620, GSK549, and GSK046, only GSK046 shows high aqueous solubility. Herein, we describe the lead optimization of a further class of highly soluble compounds based upon a picolinamide chemotype. Focusing on achieving >1000-fold selectivity for BD2 over BD1 ,while retaining favorable physical chemical properties, compound 36 was identified as being 2000-fold selective for BD2 over BD1 (Brd4 data) with >1 mg/mL solubility in FaSSIF media. 36 represents a valuable new in vivo ready molecule for the exploration of the BD2 phenotype.