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Identification of 4‑Phenoxyquinoline Based Inhibitors for L1196M Mutant of Anaplastic Lymphoma Kinase by Structure-Based Design

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posted on 01.11.2017, 00:00 by Shinmee Mah, Jung Hee Park, Hoi-Yun Jung, Kukcheol Ahn, Soyeon Choi, Hyun Seop Tae, Kyung Hee Jung, Jin Kyung Rho, Jae Cheol Lee, Soon-Sun Hong, Sungwoo Hong
Dysregulation of anaplastic lymphoma kinase (ALK) has been detected in nonsmall cell lung cancer (NSCLC) in the form of EML4-ALK fusion. Secondary mutations opposing activity of the first-generation ALK inhibitor crizotinib came into existence, requiring mutation-targeting drug discovery for the powerful second-line treatment. In this study, we report 4-phenoxyquinoline-based inhibitors that overcome crizotinib resistance to ALK L1196M, discovered by the fragment-growing strategy. The protonation of 4-aminoquinoline core could interrupt the ability the N atom of quinoline to act as a hydrogen bond acceptor; therefore, the pKa and calculated ionization pH values of relevant pyridine-based core moieties were carefully analyzed. The replacement of amine linkage with ether resulted in single-digit nanomolar range inhibitors. The inhibitors exhibited significant antiproliferative effects on H2228 CR crizotinib-resistant cells by decreasing PI3K/AKT and MAPK signaling. This work constitutes the first example for systematic investigation of the effect of ionization pH on activity in this system.