Butyrylcholinesterase (BChE) has been more and more attractive for treating neurodegenerative diseases, especially Alzheimer's disease (AD). In this study, we conducted activity and druggability optimization based on the structures that were previously reported. Most compounds exhibited pronounced BChE inhibitory capacity with nanomolar IC50 values. Based on the results of inhibiting activity and cyto-safety evaluations, two compounds (7, eqBChE IC50 = 2.94 nM, hBChE IC50 = 34.6 nM, and 20, eqBChE IC50 = 0.15 nM, hBChE IC50 = 45.2 nM) have been selected as candidates. High stability of compound 20 contributed to significantly improved blood concentration and tissue exposure, resulting in a reduced administration and effective dose in pharmacodynamic experiments. Two candidates exhibited remarkable neuroprotective properties and cognition improving activity, by benefiting cholinergic system, reducing the total Aβ amount and increasing the ghrelin content. Simultaneous modulation in the center and periphery greatly improves the efficiency of BChE inhibitors. Considering the regulation on ghrelin level, BChE inhibition could improve not only symptoms but also nutritional status of AD patients.
Keywords: Cognitive improvement; Neuroprotection; Selective butyrylcholinesterase inhibitor.
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