BI-2536 is a potentPlk1inhibitor withIC50of 0.83 nM in a cell-free assay. BI-2536 inhibitsBromodomain 4 (BRD4)with Kd of 37 nM and potently suppressesc-Mycexpression. BI-2536 inducesapoptosisand attenuatesautophagy. Phase 2. In vitro
BI 2536 blocks the activities of Plk2 and Plk3 to a slightly lesser extent with IC50 of 3.5 nM and 9.0 nM, respectively. In HeLa cells, BI 2536 treatment ranging from 10-100 nM leads to the blocking of the recruitment of γ-tubulin and phosphorylation of Apc6 at mitotic centrosomes, inhibition of cohesin release from chromosome arms, induction of monopolar spindles, as well as a range of other mitotic processes that are known to depend on Plk1. BI 2536 treatment leads to the HeLa cells arrested in G2/M, subsequently a sub-G1 DNA peak indicative of DNA breakdown and apoptosis, and accumulated cleaved PARP p85 fragments in a concentration-dependent manner. BI 2536 inhibits the growth of a panel of 32 human cancer cell lines with EC50 of 2-25 nM, while blocking the proliferation of exponentially growing hTERT-RPE1, human umbilical vein endothelial cells (HUVECs), and normal rat kidney (NRK) cells with EC50 of 12-31 nM. Plk1 inhibition by BI 2536 reduces the growth and viability of anaplastic thyroid carcinoma (ATC) cells such as CAL62, OCUT-1, SW1736, 8505C, and ACT-1 with EC50 values of 1.4-5.6 nM.
In vivo
BI 2536 given i.v. once or twice per week is highly efficacious in diverse xenograft models with acceptable tolerability by inhibiting cell proliferation through a mitotic arrest, and subsequently induction of tumor-cell death. Administration of BI 2536 at 50 mg/kg once or twice per week significantly inhibits growth of HCT 116 xenografts with T/C of 15% and 0.3%, respectively. BI 2536 treatment twice-weekly also leads to excellent tumor-growth in BxPC-3 and A549 models with T/C of 5% and 14%, respectively. Cell Data
cell lines：
Concentrations：Dissolved in DMSO, final concentrations ~1 μM
Incubation Time：24 and 72 hours
Powder Purity:≥98%
Associated Targets
BRD4Tchem Bromodomain-containing protein 4 19 Activities
