Discovery of N-((1-(4-(3-(3-((6,7-Dimethoxyquinolin-3-yl)oxy)phenyl)ureido)-2-(trifluoromethyl)phenyl)piperidin-4-yl)methyl)propionamide (CHMFL-KIT-8140) as a Highly Potent Type II Inhibitor Capable of Inhibiting the T670I "Gatekeeper" Mutant of cKIT Kinase.

Li B, Wang A, Liu J, Qi Z, Liu X, Yu K, Wu H, Chen C, Hu C, Wang W, Wu J, Hu Z, Ye L, Zou F, Liu F, Wang B, Wang L, Ren T, Zhang S, Bai M, Zhang S, Liu J, Liu Q
J Med Chem. 2016 59 (18): 8456-72

PMID: 27545040 · DOI:10.1021/acs.jmedchem.6b00902

cKIT kinase inhibitors, e.g., imatinib, could induce drug-acquired mutations such as cKIT T670I that rendered drug resistance after chronic treatment. Through a type II kinase inhibitor design approach we discovered a highly potent type II cKIT kinase inhibitor compound 35 (CHMFL-KIT-8140), which potently inhibited both cKIT wt (IC50 = 33 nM) and cKIT gatekeeper T670I mutant (IC50 = 99 nM). Compound 35 displayed strong antiproliferative effect against GISTs cancer cell lines GIST-T1 (cKIT wt, GI50 = 4 nM) and GIST-5R (cKIT T670I, GI50 = 26 nM). In the cellular context it strongly inhibited c-KIT mediated signaling pathways and induced apoptosis. In the BaF3-TEL-cKIT-T670I isogenic cell inoculated xenograft mouse model, 35 exhibited dose dependent tumor growth suppression efficacy and 100 mg/kg dosage provided 47.7% tumor growth inhibition (TGI) without obvious toxicity. We believe compound 35 would be a good pharmacological tool for exploration of the cKIT-T670I mutant mediated pathology in GISTs.

MeSH Terms (18)

Amides Animals Cell Line, Tumor Female Gastrointestinal Neoplasms Gastrointestinal Stromal Tumors Gastrointestinal Tract Halogenation Humans Methylation Mice Mice, Nude Models, Molecular Mutation Protein Kinase Inhibitors Proto-Oncogene Proteins c-kit Rats, Sprague-Dawley Structure-Activity Relationship

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