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In recent years, Cassia seed extract has been reported as a neuroprotective agent in various models of neurodegeneration, mainly via an antioxidant mechanism. However, no one has previously reported the effects of Cassia seed extract and its phytochemicals on human monoamine oxidase (hMAO) enzyme activity. The seed methanol extract, the solvent-soluble fractions, and almost all isolated compounds displayed selective inhibition of hMAO-A isozyme activity. Interestingly, compounds obtusin ( 3 ), alaternin ( 8 ), aloe-emodin ( 9 ), questin ( 12 ), rubrofusarin ( 13 ), cassiaside ( 15 ), toralactone 9- O -β-gentiobioside ( 26 ), and (3 S )-9,10-dihydroxy-7-methoxy-3-methyl-1-oxo-3,4-dihydro-1 H -benzo[ g ]isochromene-3-carboxylic acid 9- O -β-d-glucopyranoside ( 38 ) showed the most promising inhibition of the hMAO-A isozyme with IC 50 values of 0.17-11 μM. The kinetic study characterized their mode of inhibition and molecular docking simulation predicted interactions with Ile-335 and Tyr-326 in support of the substrate/inhibitor selectivity in respective isozymes. These results demonstrate that Cassia seed extract and its constituents inhibit hMAO-A enzyme activity with high selectivity and suggest that they could play a preventive role in neurodegenerative diseases, especially anxiety and depression.

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In Vitro and in Silico Human Monoamine Oxidase Inhibitory Potential of Anthraquinones, Naphthopyrones, and Naphthalenic Lactones from <i>Cassia obtusifolia</i> Linn Seeds

In Vitro and in Silico Human Monoamine Oxidase Inhibitory Potential of Anthraquinones, Naphthopyrones, and Naphthalenic Lactones from Cassia obtusifolia Linn Seeds