期刊
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
卷 75, 期 6, 页码 1079-1084出版社
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.100881
关键词
Artemisia sacrorum Ledeb.; AMP-activated protein kinase; glucose production
类别
资金
- National Natural Science Foundation of China [30960523]
In this study, we investigated the effects of a petroleum ether fraction of Artemisia sacrorum Ledeb. (Compositae) (PEASL) on glucose production through AMP-activated protein kinase (AMPK) activation in human HepG2 cells. PEASL significantly inhibited glucose production in a concentration-dependent manner, and this effect was reversed in the presence of compound C, a selective AMPK inhibitor. PEASL markedly induced the phosphorylation of AMPK and downstream acetyl-CoA carboxylase (ACC) in a time- and concentration-dependent manner. In addition, it markedly increased the phosphorylations of glycogen synthase kinase 3 beta (GSK3 beta) in a concentration-dependent manner. In contrast, cAMP reponse element binding protein (CREB), a key transcription factor for gluconeogenic enzyme phosphorylation, decreased in a concentration-dependent manner. PEASL downregulated the gluconeogenesis gene expression of peroxisome proliferation activated receptor-gamma coactivator-1 alpha (PGC-1 alpha), phosphoenolpyruvate carboxykinase (PEPCK), and glucose-6-phosphatase (G6Pase) in a concentration-dependent manner. In addition, the gene expression of orphan nuclear receptor small heterodimer partner (SHP) increased, also in a concentration-dependent manner. These effects were also abolished by pretreatment with compound C, an AMPK inhibitor. This indicates that PEASL inhibited glucose production via the AMPK-GSK-CREB pathway in HepG2 cells, and these effects appeared to be capable of revealing antidiabetic mechanism of PEASL in HepG2 cells.
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