[EN] ATX INHIBITOR BASED ON INDOLE MOTHER NUCLEUS, AND PREPARATION METHOD THEREFOR AND USE THEREOF<br/>[FR] INHIBITEUR D'ATX À BASE DE NOYAU PARENT INDOLE, ET PROCÉDÉ DE PRÉPARATION DE CELUI-CI ET UTILISATION DE CELUI-CI<br/>[ZH] 基于吲哚母核的ATX抑制剂及其制备方法和应用
ATX was capable of catalyzing the hydrolysis of LPC to the lipid mediator LPA which attracted considerable attention on the development of potent ATX inhibitors. Herein, driven by the HTS product indolebased lead 1, a hybridization strategy was utilized to construct the trifluoroacetyl hydrazone moiety through assembling the phenyl thiazole fragment to the indole skeleton of lead 1. After a systematic structure guided optimization, by cycling the phenyl thiazole to the compacted benzothiazole or decreasing the lipophilicity, two promising ATX inhibitors (9j and 25a) were identified with IC50 values of 2.1 nM and 19.0 nM, respectively. All compounds were tested a panel of cancer cell lines and a preliminary affinity on breast cancer cell lines (SI > 16.5) were observed which shed a light on their potential application of breast cancer relevant cases. Through a dedicated docking study, the intramolecular pseudo-ring within the trifluoroacetylhydrazone moiety played a significant role in constraining the binding poses of 9j and 25a. Finally, a binding free energy calculation was conducted to examine the contribution of different interactions in binding affinity. (C) 2020 Elsevier Masson SAS. All rights reserved.
Discovery of Novel Indole-Based Allosteric Highly Potent ATX Inhibitors with Great <i>In Vivo</i> Efficacy in a Mouse Lung Fibrosis Model
Autotaxin (ATX) is the dominant catalytic enzyme accounting for the lipid mediator lysophosphatidic acid (LPA) through hydrolysis of lysophosphatidylcholine (LPC). There is great interest in developing nonacidic ATX inhibitors with a specific binding mode to serve as potential in vivo effective therapeutic tools. Herein, dating from a high-throughput screening (HTS) product Indole-1 (740 nM), a dedicated optimization campaign was implemented through derivatizing the -COOH group to versatile linkers that well-bridged the indole skeleton and the hydrophobic pocket binding groups. Ultimately, it was established that the coexistence of a carbamate linker and -OH-group-containing amines could generally furnish excellent indole-based ATX inhibitors with even below 1 nM in vitro activities. Two optimal entities were advanced to a bleomycin-induced mice pulmonary fibrosis model, which exerted promising efficacy in alleviating the damaged lung texture caused by bleomycin exposure. The novel carbamate-containing indole-based ATX inhibitors with a concrete binding mode may contribute to the identification of potential therapeutic agents to intervene in fibrotic diseases.
Structure-based linker exploration: Discovery of 1-ethyl-1H-indole analogs as novel ATX inhibitors
group. Resultantly, compounds 8∼17 containing acyl hydrazone linker displayed poor activity (over 3.49 μM). Alternatively, replacing the acylhydrazone linker with urea counterpart by the amide bond reversal principle, the acquired compounds 18∼22 achieved obvious improvements with submicromolar activities. Furthermore, with the aim to reducing cLogP, the thiazole ring of 18∼22 was altered to the benzamide