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Molecular interactions, binding stability, and synergistic inhibition on Acetylcholinesterase activity of Safranin O in combination with Quercetin and Gallic acid: in vitro and in silico study

Imededdine Kadi, W. A. Eltayb, A. Boufissiou, Farouk Benaceur, A. Bouchareb, Wissem Ben Soltan, M. H. Baladehi, A. Kheniche et al.

Journal of Molecular Structure, 2023

25 citations

Abstract

The clinical management of multifactorial diseases, especially in neurodegenerative disorders, requires the identification of potent synergistic interactions between therapeutic molecules. In this context, the current study was carried out to evaluate the synergistic inhibitory effect on Acetylcholinesterase activity by Safranin O in combination with Quercetin and Gallic acid in vitro and in silico . Anti-AChE activity was assessed using Ellman's colorimetric method, while the Synergistic and antagonistic interactions were calculated by Loewe, Zip, Bliss and HSE statistical models and plotted using synergyfinder plus tool. Molecular docking of complexed ligands was performed by auto-dock vina tool, Discovery studio and MOE softwares. Molecular dynamic simulations were carried out using Desmond Schrödinger software and the essential parameters were analyzed in 100 ns of simulation time. Our results showed potent inhibitory activities for all tested compounds Safranin O (IC 50 =15.76±1.15 µM), Quercetin (IC 50 =21.41±0.25 µM), Gallic acid (IC 50 =77.59±0.44 µM) in comparison with Galantamine (IC 50 =2,14±0.07 µM). The binary combination (1/1 ratio) Exhibited a significant improvement in IC 50 values, Safranine O - Quercetin (9.07±0.82 µM), Safranine O-Gallic acid (3.46±0.12 µM) and became statistically comparable to standard. The interactive dose-response matrixes and the interaction scores were developed and quantified; the latter showed potent synergistic forms in particular…

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