BAY 1217389 is an effective and selective inhibitor of the monopolar spindle 1 (MPS1) kinase (IC50<10 nM).

Mps1:<10 nM

In biochemical assays, the IC50 value of BAY 1217389 is 0.63±0.27 nmol/L. It shows high selectivity against other kinases and found to bind to PDGFRβ (<10 nmol/L), Kit (between 10 and 100 nmol/L), CLK1, CLK2, CLK4, JNK1, JNK2, JNK3, LATS1, MAK, MAPKAP2, MERTK, p38β, PDGFRα, PIP5K1C, PRKD1, and RPS6KA5 (between 100 and 1,000 nmol/L). In cellular mechanistic assays, BAY1217389 abrogats nocodazole-induced SAC activity and induced premature exit from mitosis ('mitotic breakthrough'), resulting in multinuclearity and tumor cell death. It is found to inhibit cell proliferation with a median IC50 of 6.7 nmol/L (range 3 to >300 nmol/L)[1].

In vivo, BAY 1217389 achieves moderate efficacy in monotherapy in tumor xenograft studies. Its blood clearance is found to be low in the tested species. Vss is high and terminal half-lives were long. BAY 1217389 is administered orally to female NMRI mouse (1 mg/kg) and male Wistar rat (0.5 mg/kg). Peak plasma concentrations are observed between 1.5 and 7 hours. Oral bioavailability is high in rat and moderate in mouse[1].

Inhibition of recombinant human Mps1 by BAY 1161909 or BAY 1217389 is assessed in TRFRET-based in vitro kinase assays via phosphorylation of a biotinylated peptide (Biotin-Ahx-PWDPDDADITEILG-NH2). Under standard assay conditions kinase and test compound are preincubated for 15 min before enzyme reaction is started by addition of substrate and ATP upon 10 μM[1].

Cells are seeded into 96-well plates at densities ranging from 1,000 to 5,000 cells per well in the appropriate medium supplemented with 10% FCS. After 24 hours, cells are treated in quadruplicates with serial dilutions of compounds. After further 96 hours, adherent cells are fixed with glutaraldehyde and stained with crystal violet. IC50 values are calculated by means of a 4-parameter fit using the company's own software.(Only for Reference)

DMSO: 30 mg/mL (53.43 mM), Sonication is recommended.

H2O: < 1 mg/mL (insoluble or slightly soluble)

Ethanol: 3 mg/mL (5.34 mM), Sonication is recommended.

10% DMSO+90% Corn Oil: 3.3 mg/mL (5.88 mM), Sonication is recommended.