MS436

Catalog No.S7305 Batch:S730501

Technical Data

Formula	C₁₈H₁₇N₅O₃S
Molecular Weight	383.42	CAS No.	1395084-25-9
Solubility (25°C)*	In vitro	DMSO	55 mg/mL (143.44 mM)
		Ethanol	1 mg/mL (2.6 mM)
		Water	Insoluble
* <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

MS436 is a selective BET bromodomain inhibitor with K_i of <0.085 μM and 0.34 μM for BRD4 (1) and BRD4 (2), respectively.

Targets

BRD4 (1) ^[1]	BRD4 (2) ^[1]
<0.085 μM(Ki)	0.34 μM(Ki)

In vitro

MS436 exhibits low nanomolar affinity with preference for the first bromodomain over the second. MS436 effectively inhibits BRD4 activity in NF-κB-directed production of nitric oxide and proinflammatory cytokine interleukin-6 in murine macrophages without siginificanty inhibition on cell viability. ^[1]

Protocol (from reference)

Kinase Assay:^{^[1]}	Fluorescence Anisotropy Binding Assay Binding affinity of the newly synthesized diazobenzene compounds for various bromodoamins is assessed in a fluorescence anisotropy competition assay using a fluorescein isothiocyanate (FITC)-labeled MS417 as an assay probe. Competition experiments are performed with a BrD protein (0.25–1 µM) and the fluorescent probe (80 nM), and increasing concentration of unlabeled competing ligand in a PBS buffer (pH 7.4) in total volume of 80 µL Measurements are obtained after a 1 hour incubation of the fluorescent ligand and the protein at 25°C with Safire 2 microplate reader. In a competition-binding assay, fluorescent ligand concentration is ≤ 2Kd, and protein concentration was set at which 50-80% of fluorescent ligand is bound. Dissociation constant of a competing ligand is calculated with the correction to Cheng-Prussoff equation introduced by Nicolovska-Coleska and colleagues. Assuming one-site competitive binding model, the equation used to calculate Ki’s from IC50 values recovered from fitting data using Prism.
Cell Assay:^{^[1]}	Cell lines Murine macrophage RAW264.7 cells Concentrations ~100 μM Incubation Time 24 hours Method Murine macrophage RAW264.7 cells are plated at a density of 10000 cells per well in a 96-well plate and incubated at 37 °C for 18 h. The cells are then treated with the diazobenzene bromodomain inhibitors up to 100 μL for 24 hours. At the end of the 24 hr incubation, 10 μL of the MTT solution (4 mg/ml) is added to each well and incubated at 37°C for 4 h. The supernatants are then removed and the cells were solubilized in 100 μL of 100% DMSO. The diazobenzene compounds are first dissolved in DMSO then diluted with culture medium to concentrations that ranged from 0.28 to 50000 nM. The final concentration of DMSO is adjusted to 0.05% (v/v). The extent of the reduction is measured by the absorbance at 570/630 nm using EnVison 2104 Multilabel Reader.

Kinase Assay:^{^[1]}

Fluorescence Anisotropy Binding Assay
Binding affinity of the newly synthesized diazobenzene compounds for various bromodoamins is assessed in a fluorescence anisotropy competition assay using a fluorescein isothiocyanate (FITC)-labeled MS417 as an assay probe. Competition experiments are performed with a BrD protein (0.25–1 µM) and the fluorescent probe (80 nM), and increasing concentration of unlabeled competing ligand in a PBS buffer (pH 7.4) in total volume of 80 µL Measurements are obtained after a 1 hour incubation of the fluorescent ligand and the protein at 25°C with Safire 2 microplate reader. In a competition-binding assay, fluorescent ligand concentration is ≤ 2Kd, and protein concentration was set at which 50-80% of fluorescent ligand is bound. Dissociation constant of a competing ligand is calculated with the correction to Cheng-Prussoff equation introduced by Nicolovska-Coleska and colleagues. Assuming one-site competitive binding model, the equation used to calculate Ki’s from IC50 values recovered from fitting data using Prism.

Cell Assay:^{^[1]}

Cell lines
Murine macrophage RAW264.7 cells
Concentrations
~100 μM
Incubation Time
24 hours
Method
Murine macrophage RAW264.7 cells are plated at a density of 10000 cells per well in a 96-well plate and incubated at 37 °C for 18 h. The cells are then treated with the diazobenzene bromodomain inhibitors up to 100 μL for 24 hours. At the end of the 24 hr incubation, 10 μL of the MTT solution (4 mg/ml) is added to each well and incubated at 37°C for 4 h. The supernatants are then removed and the cells were solubilized in 100 μL of 100% DMSO. The diazobenzene compounds are first dissolved in DMSO then diluted with culture medium to concentrations that ranged from 0.28 to 50000 nM. The final concentration of DMSO is adjusted to 0.05% (v/v). The extent of the reduction is measured by the absorbance at 570/630 nm using EnVison 2104 Multilabel Reader.

References

[1] Zhang G, et al. J Med Chem. 2013, 56(22), 9251-9264.

Customer Product Validation

: Data from [Data independently produced by , , Cell Physiol Biochem, 2018, 50(2):640-653]

Selleck's MS436 has been cited by 4 publications

Inhibition of BET Family Proteins Suppresses African Swine Fever Virus Infection [ Microbiol Spectr, 2022, 10(4):e0241921]	PubMed: 35758684
Epigenetic Reprogramming with Antisense Oligonucleotides Enhances the Effectiveness of Androgen Receptor Inhibition in Castration-Resistant Prostate Cancer [ Cancer Res, 2018, 78(20):5731-5740]	PubMed: 30135193
Bromodomain-Containing Protein 4 (BRD4) Inhibition Sensitizes Palomid 529-Induced Anti-Renal Cell Carcinoma Cell Activity in Vitro and in Vivo [Xing ZY, et al. Cell Physiol Biochem, 2018, 50(2):640-653]	PubMed: 30308518
BRD4 inhibitors block telomere elongation. [ Nucleic Acids Res, 2017, 45(14):8403-8410]	PubMed: 28854735

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SHIPPING AND STORAGE
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