Abstract
Objectives: Melinjo (Gnetum gnemon) seeds have been known to have some biological properties. One of them is ant hypercholesterolemia. The present study investigated in vitro and in silico methods to predict potential antihypercholesterolemic of the Melinjo seed extracts of through HMG-CoA reductase inhibitory activity. Methods: Melinjo seed powders were successively extracted by reflux method using five solvents with gradient polarity including: n-hexane, dichloromethane, ethyl acetate and methanol. All extracts were evaluated in vitro using HMG-CoA Reductase assay kit, to analyze the inhibitory activity. Molecular docking of the phytochemical content of the seeds were carried out using Auto Dock Vina, and also Ligand Scout to analyses interaction between ligand and receptor. Results: Dichloromethane extract demonstrated the highest inhibitory activity against HMG-CoA reductase with IC50 value is 0.40 μg/mL, followed by that of ethyl acetate extract. UPLC-MS analyses showed that dichloromethane extract contained trans-resveratrol, piceid, gnetin C, gnetol, isorhapontigenin, ɛ-viniferin, gnemonol L, and gnemonol M. Molecular docking studies demonstrated that dimer of resveratrol such as gnemonol L, gnemosida, and ɛ-viniferin have better free binding energy than that of monomer. piceid, gnetin C, gnemonol L, and gnemonol M could be considered as HMG-CoA reductase inhibitor. Conclusion: Gnetum gnemon seed extract showed strong HMG-CoA reductase activity. Resveratrol dimer promises as a potential lead compound to design/synthesize anti-cholesterol. Key words: Gnetum gnemon, Melinjo, HMG-CoA Reductase, Resveratrol, Stilbene, Molecular Docking.
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