Nectandrin B, a lignan isolated from nutmeg, inhibits liver X receptor-α-induced hepatic lipogenesis through AMP-activated protein kinase activation.
Pharmazie
; 70(11): 733-9, 2015 Nov.
Article
em En
| MEDLINE
| ID: mdl-26790190
ABSTRACT
Nonalcoholic fatty liver disease is recognized as the most commonly occurring chronic liver disease. Liver X receptor α (LXRα) and sterol regulatory element-binding protein (SREBP)-1c play a central role in de novo fatty acid synthesis. This study investigated pharmacological effects of nectandrin B, a lignan isolated from nutmeg extract, on hepatic lipogenesis stimulated by LXRα-SREBP-1c-mediated pathway and the possible molecular basis. The reporter gene assay revealed that nectandrin B completely represses LXRα activity enhanced by a synthetic LXRα ligand (T0901317) in HepG2 cells. The inhibitory effect was further supported by the suppression of mRNA expression of LXRα target genes, SREBP-1c and LXRα itself. Nectandrin B also inhibited the increase in SREBP-1c expression promoted by insulin plus high glucose, major contributors to hepatic lipid accumulation. LXRα-SREBP-1c-mediated induction of acetyl-CoA carboxylase 1 and fatty acid synthase, major genes for de novo lipogenesis, was suppressed by nectandrin B. Moreover, Oil Red O staining showed that nectandrin B notably attenuates LXRα-induced lipid accumulation. AMP-activated protein kinase (AMPK) inhibits the activities of LXRα and SREBP-1c. Nectandrin B strongly activated AMPK signaling in HepG2 cells. Taken together, the suppressive effects of nectandrin B on lipogenic gene expression and lipid accumulation in hepatocytes may be due to its inhibitory effect on the LXRα-SREBP-1c pathway presumably via AMPK activation. These results suggest the potential of nectandrin B as a therapeutic candidate for fatty liver disease.
Buscar no Google
Bases de dados:
MEDLINE
Assunto principal:
Lignanas
/
Proteínas Quinases Dependentes de AMP Cíclico
/
Myristica
/
Lipogênese
/
Receptores X do Fígado
/
Fígado
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Pharmazie
Assunto da revista:
FARMACIA
Ano de publicação:
2015
Tipo de documento:
Article