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Molibresib (I-BET-762) BET inhibitor

Name: Molibresib (I-BET-762)
Brand: Selleck Chemicals
SKU: S7189
Availability: InStock
Rating: 5 (40 reviews)

Cat.No.S7189

Molibresib (I-BET-762, GSK525762, GSK525762A) is an inhibitor for BET proteins with IC50 of ~35 nM in a cell-free assay. It suppresses the production of proinflammatory proteins by macrophages and blocks acute inflammation, and is highly selective over other bromodomain-containing proteins.

Chemical Structure

Molecular Weight: 423.9

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Quality Control

Batch: Purity: 99.87%

99.87

Related Targets	HDAC JAK Histone Methyltransferase PKC PARP HIF PRMT EZH2 AMPK Histone Acetyltransferase
Other BET Inhibitors	Pelabresib (CPI-0610) ZEN-3694 (BET-IN-19) Mivebresib (ABBV-075) INCB054329 Birabresib (OTX015) I-BET151 (GSK1210151A) Apabetalone (RVX-208) CPI-203 AZD5153 6-hydroxy-2-naphthoic acid ARV-825

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Concentration	Incubation Time	Activity Description	PMID
HepG2	Function assay		18 hrs	Induction of human ApoA1 gene expression in stably transfected human HepG2 cells coexpressing luciferase reporter gene after 18 hrs by luminescence assay, EC50 = 0.7 μM.	21568322
HepG2	Function assay		6 hrs	Induction of human ApoA1 protein synthesis in human HepG2 cells assessed as neosynthesised radiolabeled protein secretion after 6 hrs by SDS PAGE analysis in presence of [35S]methionine	21568322
HepG2	Function assay		18 hrs	Upregulation of ApoA1 expression in human HepG2 cells assessed as concentration required to increase 70% of luciferase activity after 18 hrs by luciferase reporter gene assay, EC170 = 0.2 μM.	22386529
HepG2	Function assay		18 hrs	Induction of human ApoA1 gene expression in stably transfected human HepG2 cells coexpressing luciferase reporter gene after 18 hrs by luminescence assay, EC50 = 0.7 μM.	22924434
PBMC	Antiinflammatory assay			Antiinflammatory activity against human PBMC cells assessed as LPS-induced IL-6 production by chemiluminescence assay, IC50 = 0.31623 μM.	24015967
Raji	Function assay		4 hrs	Inhibition of BRD4 in human Raji cells assessed as reduction of MYC expression after 4 hrs, IC50 = 0.19 μM.	24900758
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD3 BD2 (306 to 417 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, Ki = 0.0303 μM.	26080064
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD4 BD2 (333 to 460 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, Ki = 0.0323 μM.	26080064
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD4 BD1 (44 to 168 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, Ki = 0.0388 μM.	26080064
Rosetta2 DE3	Function assay			Binding affinity to biotinylated BRD3 BD2 (306 to 417 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells by bio-layer interferometry method, Kd = 0.0407 μM.	26080064
Rosetta2 DE3	Function assay			Binding affinity to biotinylated BRD2 BD2 (349 to 460 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells by bio-layer interferometry method, Kd = 0.0454 μM.	26080064
Rosetta2 DE3	Function assay			Binding affinity to biotinylated BRD4 BD2 (333 to 460 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells by bio-layer interferometry method, Kd = 0.0476 μM.	26080064
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD2 BD2 (349 to 460 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, Ki = 0.0492 μM.	26080064
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD3 BD1 (24 to 144 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, Ki = 0.0539 μM.	26080064
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD2 BD1 (72 to 205 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, Ki = 0.0568 μM.	26080064
Rosetta2 DE3	Function assay			Binding affinity to biotinylated BRD3 BD1 (24 to 144 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells by bio-layer interferometry method, Kd = 0.0607 μM.	26080064
MV4-11	Cytotoxicity assay		4 days	Cytotoxicity against human MV4-11 cells harboring MLL1 fusion gene assessed as growth inhibition after 4 days by CellTiter-Glo luminescent assay, IC50 = 0.093 μM.	26080064
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD4 BD2 (333 to 460 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, IC50 = 0.0984 μM.	26080064
Rosetta2 DE3	Function assay			Binding affinity to biotinylated BRD4 BD1 (44 to 168 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells by bio-layer interferometry method, Kd = 0.0994 μM.	26080064
Rosetta2 DE3	Function assay		30 mins	Displacement of FAM-labeled ZBA248 from BRD4 BD1 (44 to 168 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells after 30 mins by fluorescence polarization assay, IC50 = 0.156 μM.	26080064
Rosetta2 DE3	Function assay			Binding affinity to biotinylated BRD2 BD1 (72 to 205 amino acid residues) (unknown origin) expressed in Rosetta2 DE3 cells by bio-layer interferometry method, Kd = 0.159 μM.	26080064
MOLM13	Cytotoxicity assay		4 days	Cytotoxicity against human MOLM13 cells harboring MLL1 fusion gene assessed as growth inhibition after 4 days by CellTiter-Glo luminescent assay, IC50 = 0.241 μM.	26080064
BL21(DE3)	Function assay			Binding affinity to N-terminal His6-tagged-BRD4 bromodomain 2 (unknown origin) expressed in competent Escherichia coli BL21(DE3) cells by isothermal titration calorimetry, Kd = 0.065 μM.	26367539
BL21(DE3)	Function assay			Binding affinity to N-terminal His6-tagged-BRD4 bromodomain 1 (unknown origin) expressed in competent Escherichia coli BL21(DE3) cells by isothermal titration calorimetry, Kd = 0.095 μM.	26367539
BL21(DE3)	Function assay			Binding affinity to full length N-terminal His6-tagged-BRD2 bromodomain 2 (unknown origin) expressed in competent Escherichia coli BL21(DE3) cells by isothermal titration calorimetry, Kd = 0.1 μM.	26367539
BL21(DE3)	Function assay			Binding affinity to full length N-terminal His6-tagged-BRD2 bromodomain 1 (unknown origin) expressed in competent Escherichia coli BL21(DE3) cells by isothermal titration calorimetry, Kd = 0.23 μM.	26367539
BL21(DE3)-R3-pRARE2	Function assay			Inhibition of human His-tagged BRD4 bromodomain 2 expressed in Escherichia coli BL21(DE3)-R3-pRARE2 cells by FRET assay, IC50 = 0.036 μM.	26731490
BL21(DE3)-R3-pRARE2	Function assay			Inhibition of human His-tagged BRD4 bromodomain 1 expressed in Escherichia coli BL21(DE3)-R3-pRARE2 cells by FRET assay, IC50 = 0.036 μM.	26731490
Rosetta2 DE3	Function assay		30 mins	Inhibition of FAM-labeled ZBA248 binding to recombinant human N-terminal His6-tagged BRD4 bromodomain 2 (333 to 460 residues) expressed in Rosetta2 DE3 cells after 30 mins by Flourescence polarization assay, Ki = 0.023 μM.	28463487
Rosetta2 DE3	Function assay		30 mins	Inhibition of FAM-labeled ZBA248 binding to recombinant human N-terminal His6-tagged BRD4 bromodomain 1 (44 to 168 residues) expressed in Rosetta2 DE3 cells after 30 mins by Flourescence polarization assay, Ki = 0.0464 μM.	28463487
Rosetta2 DE3	Function assay		30 mins	Inhibition of FAM-labeled ZBA248 binding to recombinant human N-terminal His6-tagged BRD4 bromodomain 2 (333 to 460 residues) expressed in Rosetta2 DE3 cells after 30 mins by Flourescence polarization assay, IC50 = 0.0775 μM.	28463487
MV4-11	Growth inhibition assay		4 days	Growth inhibition of human MV4-11 cells after 4 days by WST-8 assay, IC50 = 0.093 μM.	28463487
Rosetta2 DE3	Function assay		30 mins	Inhibition of FAM-labeled ZBA248 binding to recombinant human N-terminal His6-tagged BRD4 bromodomain 1 (44 to 168 residues) expressed in Rosetta2 DE3 cells after 30 mins by Flourescence polarization assay, IC50 = 0.145 μM.	28463487
MOLM13	Growth inhibition assay		4 days	Growth inhibition of human MOLM13 cells after 4 days by WST-8 assay, IC50 = 0.241 μM.	28463487
TY82	Antiproliferative assay		72 hrs	Antiproliferative activity against human TY82 cells after 72 hrs by CCK8 assay, IC50 = 0.2 μM.	28586718
MM1S	Antiproliferative assay		72 hrs	Antiproliferative activity against human MM1S cells after 72 hrs by CCK8 assay, IC50 = 0.23 μM.	28586718
BL21 (DE3)-codon plus-RIL	Function assay		4 hrs	Inhibition of JQ1-FITC binding to His6-tagged BRD4-BD1 (unknown origin) expressed in Escherichia coli BL21 (DE3)-codon plus-RIL cells incubated in dark for 4 hrs by fluorescence anisotropy assay, IC50 = 0.26 μM.	28586718
THP1	Antiproliferative assay			Antiproliferative activity against human THP1 cells, IC50 = 0.29 μM.	28939121
TY82	Antiproliferative assay			Antiproliferative activity against human TY82 cells, IC50 = 0.39 μM.	28939121
NALM16	Cytotoxicity assay		5 days	Cytotoxicity against human NALM16 cells assessed as reduction in cell viability after 5 days by CellTiter-Glo assay, EC50 = 0.27 μM.	29170024
NALM6	Cytotoxicity assay		5 days	Cytotoxicity against human NALM6 cells assessed as reduction in cell viability after 5 days by CellTiter-Glo assay, EC50 = 0.39 μM.	29170024
697	Cytotoxicity assay		5 days	Cytotoxicity against human 697 cells assessed as reduction in cell viability after 5 days by CellTiter-Glo assay, EC50 = 1.17 μM.	29170024
HD-MB03	Cytotoxicity assay		5 days	Cytotoxicity against human HD-MB03 cells assessed as reduction in cell viability after 5 days by CellTiter-Glo assay, EC50 = 3.5 μM.	29170024
A673	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for A673 cells	29435139
DAOY	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for DAOY cells	29435139
Saos-2	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Saos-2 cells	29435139
BT-37	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for BT-37 cells	29435139
RD	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for RD cells	29435139
MG 63 (6-TG R)	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for MG 63 (6-TG R) cells	29435139
NB1643	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB1643 cells	29435139
OHS-50	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for OHS-50 cells	29435139
Rh41	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for Rh41 cells	29435139
SJ-GBM2	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SJ-GBM2 cells	29435139
SK-N-MC	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for SK-N-MC cells	29435139
NB-EBc1	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for NB-EBc1 cells	29435139
LAN-5	qHTS assay			qHTS of pediatric cancer cell lines to identify multiple opportunities for drug repurposing: Primary screen for LAN-5 cells	29435139
TY82	Antiproliferative assay		72 hrs	Antiproliferative activity against human TY82 cells after 72 hrs by CCK8 assay, IC50 = 0.3043 μM.	29525435
MM1S	Antiproliferative assay		72 hrs	Antiproliferative activity against human MM1S cells after 72 hrs by CCK8 assay, IC50 = 0.3492 μM.	29525435
TY82	Function assay	0.2 to 1 uM	24 hrs	Inhibition of BRD4 in human TY82 cells assessed as reduction in c-Myc protein expression at 0.2 to 1 uM after 24 hrs by Western blot analysis	29525435
TY82	Function assay	0.2 to 1 uM	24 hrs	Inhibition of BRD4 in human TY82 cells assessed as reduction in c-Myc mRNA expression at 0.2 to 1 uM after 24 hrs by RT-PCR analysis	29525435
TY82 or NCI-H1299	Function assay	0.2 to 1 uM	24 hrs	Inhibition of BRD4 in human TY82 or NCI-H1299 cells assessed as reduction in PD-L1 protein expression at 0.2 to 1 uM after 24 hrs by Western blot analysis	29525435
TY82 or NCI-H1299	Function assay	0.2 to 1 uM	24 hrs	Inhibition of BRD4 in human TY82 or NCI-H1299 cells assessed as reduction in PD-L1 mRNA expression at 0.2 to 1 uM after 24 hrs by RT-PCR analysis	29525435
C4-2B	Antiproliferative assay		96 hrs	Antiproliferative activity against human C4-2B cells after 96 hrs by Cell-Titer glo reagent based luminescence assay	29541371
22Rv1	Antiproliferative assay		96 hrs	Antiproliferative activity against human 22Rv1 cells after 96 hrs by Cell-Titer glo reagent based luminescence assay	29541371
LNCAP	Antiproliferative assay		96 hrs	Antiproliferative activity against human LNCAP cells after 96 hrs by Cell-Titer glo reagent based luminescence assay	29541371
HL60	Cytotoxicity assay			Cytotoxicity against human HL60 cells by MTS assay, IC50 = 0.12 μM.	29657099
Raji	Function assay			Inhibition of BRD4-BD1 in human Raji cells assessed as downregulation of MYC gene expression by PCR method, IC50 = 0.132 μM.	29657099
LNCAP	Antiproliferative assay			Antiproliferative activity against human LNCAP cells, IC50 = 0.3565 μM.	29758518
MV411	Cytotoxicity assay		72 hrs	Cytotoxicity against human MV411 cells after 72 hrs by CellTiter-Glo assay, IC50 = 0.8 μM.	30268702
Click to View More Cell Line Experimental Data

Solubility

In vitro
Batch:

DMSO : 84 mg/mL (198.15 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Ethanol : 42 mg/mL

Water : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	5%DMSO 1 40%PEG300 2 5%Tween80 3 50%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	4.250mg/ml (10.03mM)	Taking the 1 mL working solution as an example, add 50 μL of 85 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.

In vivo Formulation Calculator (Clear solution)

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Chemical Information, Storage & Stability

Molecular Weight	423.9	Formula	C₂₂H₂₂ClN₅O₂	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	1260907-17-2	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin 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

Mechanism of Action

Targets/IC₅₀/Ki	BET proteins (Cell-free assay) 35 nM
In vitro	Molibresib (I-BET-762) is an inhibitor for BET (bromodomain and extra terminal domain) proteins, BRD2, BRD3 and BRD4, which binds to the tandem bromodomains of BET with K_d of 50.5–61.3 nM and displaces a tetra-acetylated H4 peptide prebound to tandem bromodomains of BET with IC50 of 32.5–42.5 nM in FRET analysis. This compound occupies the acetyl-lysine binding pocket of BET proteins and inhibits their binding to acetylated histones, thus disrupting the formation of chromatin complexes essential for expression of inflammatory genes. Treatment with it during the first 2 d of differentiation alters CD4⁺ T-cell cytokine production, up-regulating expression of several antiinflammatory gene products and down-regulating expression of several proinflammatory cytokines.
Kinase Assay	Fluorescence resonance energy transfer (FRET) titrations
Kinase Assay	Fluorescence resonance energy transfer (FRET) titrations. Molibresib (I-BET-762) 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).
In vivo	Molibresib (I-BET-762) confers protection against lipopolysaccharide-induced endotoxic shock and bacteria-induced sepsis. A single dose of this compound applied at 1.5 h after LPS injection cures the mice, and twice-daily injections for 2 days protect them against death caused by sepsis. Limited treatment with it 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).
References	[1] https://pubmed.ncbi.nlm.nih.gov/21068722/ [2] https://pubmed.ncbi.nlm.nih.gov/22912406/

Applications

Methods	Biomarkers	Images	PMID
Growth inhibition assay	Cell viability		26840085

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2024-05-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT03266159	Withdrawn	Solid Tumours	GlaxoSmithKline	November 27 2017	Phase 2
NCT02964507	Terminated	Neoplasms	GlaxoSmithKline	February 2 2017	Phase 1
NCT01943851	Completed	Neoplasms	GlaxoSmithKline	May 14 2014	Phase 2
NCT01587703	Completed	Carcinoma Midline	GlaxoSmithKline	March 28 2012	Phase 1

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