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Novel tacrine derivatives exhibiting improved acetylcholinesterase inhibition: Design, synthesis and biological evaluation.
European Journal of Medicinal Chemistry 2017 October 21
A novel series of twenty four tacrine derivatives were designed and synthesised. Among these, thirteen were taken for the acetylcholinesterase (AChE) inhibition studies. Three compounds such as 4c, 6c and 6f were found to possess significant AChE inhibitory properties with IC50 values 12.97 ± 0.47 nM, 5.17 ± 0.24 nM and 7.14 ± 0.78 nM respectively. In silico docking studies revealed that these compounds can bind strongly in the active site of the enzyme and prevent enzyme-substrate interactions. On binding, the substituted groups were oriented either towards the peripheral anionic site (PAS) (Pocket A) or towards a hydrophobic cavity (pocket B) located near the active site. The cytotoxicity and hepatotoxicity of the compounds were tested using HEK-293 and HepG2 cell lines respectively. The compound 4c did not show any significant decrease in the cell viability even at a concentration of 300 μM indicating that its cytotoxicity and hepatotoxicity are significantly lesser compared to tacrine, due to the chemical modification. Based on the available results, it can be suggested that the compound 4c might be a potential drug lead compound with AChE inhibitory activity. However, further pharmacokinetic studies are necessary to comment on the efficacy of the compound as a drug for AD.
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