PLX51107 is a potent and selective BET inhibitor, with Kds of 1.6, 2.1, 1.7, and 5 nM for BD1 and 5.9, 6.2, 6.1, and 120 nM for BD2 of BRD2, BRD3, BRD4, and BRDT, respectively. PLX51107 binds to the acetylated lysine recognition motifs in the bromodomains of the BRD4 protein, thereby preventing the binding of BRD4 to acetylated lysines on histones. PLX51107 (0.156-10 μM) suppresses the CpG-induced proliferation of primary chronic lymphocytic leukemia (CLL) cells. PLX51107 also causes accumulation of p21 and IκBα, reduces c-MYC level, and modulates proapoptotic and antiapoptotic proteins.
In vivo, PLX51107 (2 mg/kg, p.o.) inhibits splenomegaly by 75% in the Ba/F3 (murine IL3-dependent pro-B-cell line) splenomegaly mouse model, with the similar effect of 25 mg/kg OTX015. PLX51107 (20 mg/kg, qd, p.o.) exhibits potent antileukemic effects in disease models of aggressive chronic lymphocytic leukemia (CLL) and Richter transformation (RT) via oral administration once daily.
|Animal models||C57BL/6 WT mice|
|Formulation||10% N-methyl-2-pyrrolidone plus diluent (40% PEG400, 5% TPGS, 5% Poloxamer 407, and 50% water)|
|Dosages||20 mg/kg, qd (once daily)|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
|Solubility||DMSO: ≥ 60 mg/mL (Need warming)|
BRD4 Profiling Identifies Critical Chronic Lymphocytic Leukemia Oncogenic Circuits and Reveals Sensitivity to PLX51107, a Novel Structurally Distinct BET Inhibitor.
Ozer HG, et al. Cancer Discov. 2018 Apr;8(4):458-477. PMID: 29386193.
|Related Epigenetic Reader Domain Products|
AZD5153 is a potent bivalent triazolopyridazine based Bromodomain and Extraterminal (BET) Inhibitor, with IC50 value of 5 nM.
MS417 (also known as GTPL7512) is a potent and selective BRD4 inhibitor, which binds to BRD4-BD1 and BRD4-BD2 with IC50s of 30 and 46 nM, respectively.
FL-411 is a selective BRD4 inhibitor.
dBET6 is a highly potent, selective and cell-permeable degrader of BET with an IC50 of 14 nM.
dBET1 is a potent BRD4 protein degrader with an EC50 of 430 nM.
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