BETd-260

BETd-260 is a potent BET degrader based on PROTAC technology, with an IC50 of 30 pM against BRD4 protein in RS4;11 leukemia cell line.

Signaling Pathways >> Epigenetics >> Epigenetic Reader Domain

Signaling Pathways >> PROTAC >> PROTAC

Research Areas >> Cancer

IC50: 30 pM (BRD4, RS4;11 leukemia cells)[1] PROTAC

BETd-260 is a potent BET degrader based on PROTAC technology, with an IC50 of 30 pM for BRD4 protein in RS4;11 leukemia cell line. BETd-260 (ZBC260; Compound 23) shows inhibitory activity against the growth of RS4;11 leukemia cells and MOLM-13 cells with IC50s of 51 pM and 2.2 nM, respectively, and induces apoptosis in both RS4;11 and MOLM-13 cell lines at 3-10 nM[1].

BETd-260 (5 mg/kg, i.v., every other day, thrice a week for 3 weeks) causes rapid tumor regression with a maximum of >90% regression in mice bearing RS4;11 xenograft tumors, and with no body weight loss or other signs of toxicity in mice. BETd-260 (5 mg/kg, i.v.) degrades the BRD2, BRD3, and BRD4 proteins for more than 24 h, with robust cleavage of PARP and caspase-3, and strong down-regulation of c-Myc protein in RS4;11 xenograft mice model[1].

In cell growth experiments, cells are seeded in 96-well cell culture plates at a density of 10000−20000 cells/well in 100 μL of culture medium. BETd-260 is serially diluted in the appropriate medium, and 100 μL of the diluted solution containing BETd-260 is added to the appropriate wells of the cell plate. After addition of BETd-260, the cells are incubated for 4 days at 37°C in an atmosphere of 5% CO2. Cell growth is evaluated by a lactate dehydrogenase-based WST-8 assay using a multimode microplate reader. The WST-8 reagent is added to the plate, incubated for at least 1 h, and read at 450 nm. The readings are normalized to the DMSO-treated cells, and the IC50 is calculated by nonlinear regression analysis using GraphPad Prism 6 software[1].

Mice[1] To develop xenograft tumors, 5 × 106 RS4;11 cells with 50% Matrigel are injected subcutaneously on the dorsal side of severe combined immunodeficient (SCID) mice, one tumor per mouse. When tumors reach appr 100 mm3, mice are randomly assigned to BETd-260 treatment and vehicle control groups. Animals are monitored daily for any signs of toxicity and weighed 2-3 times per week during the treatment and weighed at least weekly after BETd-260 treatment end. Tumor size is measured 2-3 times per week by electronic calipers during the treatment period and at least weekly after the treatment is end. Tumor volume is calculated as V = LW2/2, where L is the length and W is the width of the tumor[1].

[1]. Zhou B, et al. Discovery of a Small-Molecule Degrader of Bromodomain and Extra-Terminal (BET) Proteins with Picomolar Cellular Potencies and Capable of Achieving Tumor Regression. J Med Chem. 2018 Jan 25;61(2):462-481.

(+)-JQ1 | GSK126 | Tazemetostat (EPZ-6438) | Birabresib (OTX015) | A 485 | Curcumin | ARV-771 | ARV-825 | I-BET762 | BI 2536 | GSK343 | C646 | 3-Deazaneplanocin A (hydrochloride) | I-BET151 | 666-15