For research use only. Not for therapeutic Use.
OTSSP167 (OTS167) is a highly potent and ATP-competitive MELK inhibitor with IC50 value of 0.41 nM.
OTSSP167 inhibits the growth of A549 (lung), T47D (breast), DU4475 (breast), 22Rv1 (prostate) and HT1197 (bladder) cancer cells with IC50 values of 6.7, 4.3, 2.3, 6.0 and 97 nM, respectively[1]. OTSSP167 can abrogate the mitotic checkpoint, disrupt MCC and MCC-APC/C interaction in MCF7 cells. OTSSP167 causes GFP-MELK localization to cell cortex in prometaphase cells[2]. OTSSP167 is a MELK selective inhibitor, exhibits a strong in vitro activity, conferring an IC50 of 0.41 nM[3].
OTSSP167 (20 mg/kg, i.v.) results in tumor growth inhibition (TGI) of 73% in xenograft mouse model; OTSSP167 (1, 5, and 10 mg/kg, p.o.) reveals TGI of 51, 91, and 108%, respectively. OTSSP167 (20 mg/kg, p.o.) shows no tumor growth suppressive effect on PC-14 xenografts[1].
| Catalog Number | I008516 |
| CAS Number | 1431697-89-0 |
| Synonyms | 1-[6-(3,5-dichloro-4-hydroxyphenyl)-4-[[4-[(dimethylamino)methyl]cyclohexyl]amino]-1,5-naphthyridin-3-yl]ethanone |
| Molecular Formula | C25H28Cl2N4O2 |
| Purity | ≥95% |
| InChI | InChI=1S/C25H28Cl2N4O2/c1-14(32)18-12-28-22-9-8-21(16-10-19(26)25(33)20(27)11-16)30-24(22)23(18)29-17-6-4-15(5-7-17)13-31(2)3/h8-12,15,17,33H,4-7,13H2,1-3H3,(H,28,29) |
| InChIKey | DKZYXHCYPUVGAF-UHFFFAOYSA-N |
| SMILES | CC(=O)C1=CN=C2C=CC(=NC2=C1NC3CCC(CC3)CN(C)C)C4=CC(=C(C(=C4)Cl)O)Cl |
| Reference | [1]. Chung S, Suzuki H, Miyamoto T, et al. Development of an orally-administrative MELK-targeting inhibitor that suppresses the growth of various types of human cancer. Oncotarget. 2012 Dec 21. [2]. Li S, et al. Maternal embryonic leucine zipper kinase serves as a poor prognosis marker and therapeutic target in gastric cancer. Oncotarget. 2016 Feb 2;7(5):6266-80. [3]. Ji W, et al. OTSSP167 Abrogates Mitotic Checkpoint through Inhibiting Multiple Mitotic Kinases. PLoS One. 2016 Apr 15;11(4):e0153518. [4]. Cho YS, et al. The crystal structure of MPK38 in complex with OTSSP167, an orally administrative MELK selective inhibitor. Biochem Biophys Res Commun. 2014 Apr 25;447(1):7-11. |
