期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 59, 期 10, 页码 5279-5285出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf200651c
关键词
dioscorea polysaccharide (DPS); tumor necrosis factor-alpha (TNF-alpha); mouse normal liver FL83B cells; insulin resistance; c-Jun N-terminal kinases (JNK)
Dioscorea is a traditional medicinal food in Asia. This study investigated the anti-insulin resistance of dioscorea polysaccharide (DPS) in inflammatory factor (tumor necrosis factor-alpha; TNF-alpha) induced mouse normal liver FL83B cells. Insulin resistance was induced by treating cells with TNF-alpha (20 ng/mL) for 5 h; subsequently, the medium was replaced with insulin and DPS for 60 min of incubation (model 1; alleviating group). In addition, cells were cotreated with TNF-alpha and DPS for 5 h in model 2 (preventing group). DPS effectively increased glucose uptake and glucose transporter 2 (GLUT2) expression of insulin-resistant cells. Furthermore, DPS stimulated insulin receptor substrate (IRS) tyrosyl phosphorylation and increased p-Akt level to alleviate insulin resistance in models 1 and 2. Finally, the possible mechanism of DPS promoting insulin sensitivity in TNF-alpha-induced FL83B cells was investigated in this study. DPS may attenuate c-Jun N-terminal kinases (JNK) and insulin resistance caused by TNF-alpha induction; therefore, DPS also elevated the levels of p-IRSTYr and p-Akt(Ser) to improve insulin sensitivity in the TNF-alpha-induced FL83B cells.
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