Structure-based optimization of oxadiazole-based GSK-3 inhibitors
摘要:
Inhibition of glycogen synthase kinase-3 (GSK-3) induces neuroprotective effects, e.g. decreases beta-amyloid production and reduces tau hyperphosphorylation, which are both associated with Alzheimer's disease (AD). The two isoforms of GSK-3 in mammalians are GSK-3 alpha and beta, which share 98% homology in their catalytic domains. We investigated GSK-3 inhibitors based on 2 different scaffolds in order to elucidate the demands of the ATP-binding pocket [1]. Particularly, the oxadiazole scaffold provided potent and selective GSK-3 inhibitors. For example, the most potent inhibitor of the present series, the acetamide 26d, is characterized by an IC50 of 2 nM for GSK-3 alpha and 17 nM for GSK-3 beta. In addition, the benzodioxane 8g showed up to 27-fold selectivity for GSK-3 alpha over GSK-3 beta, with an IC50 of 35 nM for GSK-3 alpha. Two GSK-3 inhibitors were further profiled for efficacy and toxicity in the wild-type (wt) zebrafish embryo assay to evaluate simultaneously permeability and safety. (C) 2012 Elsevier Masson SAS. All rights reserved.
(Hetero-)(arylidene)arylhydrazides as Multitarget-Directed Monoamine Oxidase Inhibitors
作者:Ashique Palakkathondi、Jong Min Oh、Sanal Dev、T. M. Rangarajan、Swafvan Kaipakasseri、Fathima Sahla Kavully、Nicola Gambacorta、Orazio Nicolotti、Hoon Kim、Bijo Mathew
DOI:10.1021/acscombsci.0c00136
日期:2020.11.9
Fourteen (hetero-)(arylidene)arylhydrazide derivatives (ABH1-ABH14) were synthesized, and their inhibitory activities against monoamine oxidases (MAOs) and acetylcholinesterase (AChE) were evaluated. Compound ABHS most potently inhibited MAO-B with an IC50 value of 0.025 +/- 0.0019 mu M; ABH2 and ABH3 exhibited high IC so values as well. Most of the compounds weakly inhibited MAO-A, except ABHS (IC50 = 3.31 +/- 0.41 mu M). Among the active compounds, ABH2 showed the highest selectivity index (SI) of 174 for MAO-B, followed by ABHS (SI = 132). ABH3 and ABHS effectively inhibited AChE with IC so values of 15.7 +/- 6.52 and 16.5 +/- 7.29 mu M, respectively, whereas the other compounds were weak inhibitors of AChE. ABHS was shown to be a reversible competitive inhibitor for MAO-A and MAO-B with K-i values of 0.96 +/- 0.19 and 0.024 +/- 0.0077 mu M, respectively, suggesting that this molecule can be considered as an interesting candidate for further development as a multitarget inhibitor relating to neurodegenerative disorders.