4.7 Article

MAO inhibiting phytochemicals from the roots of Glycyrrhiza glabra L.

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TAYLOR & FRANCIS INC
DOI: 10.1080/07391102.2023.2216298

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Monoamine oxidase inhibitors; phytomedicine; neurodegenerative disorders; Glycyrrhiza glabra; in-silico approach

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This study found that glycyrrhizin, a compound present in Glycyrrhiza glabra L. root extract, has potent inhibitory activity against monoamine oxidase B (MAOB), suggesting its potential for treating neurodegenerative disorders.
Glycyrrhizin, a natural compound that is substantially present in Glycyrrhiza glabra L. (Gg) root. Monoamine oxidase B (MAOB) inhibitor is used for the treatment of several important neuropsychological diseases like Parkinson's disease. Gg is known to possess psychoactive properties which relates to its MAO inhibitory potential. This study sought to determine the MAO inhibition property of glycyrrhizin from Gg root extract. The Aqueous extract containing glycyrrhizin was isolated from the root of Gg and characterized using TLC, HPLC, and LC-MS techniques. In silico docking was conducted using Extra precision Glide 2018, Schrodinger docking suite. In addition, the pharmacokinetic properties of the compounds were predicted using SwissADME. The binding energies of the glycyrrhizin correlated well with their in vitro MAO inhibitory potential. Glycyrrhizin exhibited potent inhibitory activity towards MAOB whereas, an aqueous extract of Gg root inhibits both A and B forms of MAO enzyme. Further, molecular docking and molecular dynamics simulation showed that liquiritigenin and methoxyglabridin showed higher stability than other inhibitor compounds from the Gg root extract. These observations suggest that the phytochemicals from the Gg root extract have potent MAO inhibition properties, which can be exploited for the treatment of neurodegenerative disorders.Communicated by Ramaswamy H. Sarma

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