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        Monacolin K affects lipid metabolism through SIRT1/AMPK pathway in HepG2 cells

        Chia-Hsin Huang,Shin-Mau Shiu,Min-Tze Wu,Wei-Lu Chen,Shyang-Guang Wang,Horng-Mo Lee 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.12

        Monacolin K is the secondary metabolite isolatedfrom Monascus spp. It is the natural form of lovastatin,which is clinically used to reduce the synthesis of cholesterolby inhibiting 3-hydroxy-3-methylglutaryl coenzyme Areductase. In the present study, monacolin K increased proteinexpression of SIRT1 and phosphorylation level of AMPactivatedprotein kinase (AMPK) in HepG2 cells. Throughactivation of SIRT1/AMPK pathway, monacolin Kincreased phosphorylation of acetyl CoA carboxylase andcaused nuclear translocation of forkhead box O1. The westernblotting results showed that monacolin K increasedexpression of adipose triglyceride lipase but decreasedabundances of fatty acid synthase (FAS) and sterol regulatory element-binding protein 1 (SREBP1). MonacolinK also decreased the intracellular accumulation of lipids asdemonstrated by Oil Red O staining. In addition, theimmunostaining showed that monacolin K prevented thenuclear translocation of SREBP1, indicating the associationwith down-regulation of FAS. All the demonstrated effectsof monacolin K were counteracted by nicotinamide orcompound C, the inhibitors of SIRT1 orAMPK. In summary,monacolin K reduces the lipid content through SIRT1/AMPK pathway in HepG2 cells, which promotes catabolismand inhibits anabolism of lipid.

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