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CJAP ›› 2017, Vol. 33 ›› Issue (6): 568-571.doi: 10.12047/j.cjap.5601.2017.134

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Ameliorative effects and the mechanism of lyceum barbarum polysaccharide on insulin resistance of HepG2 cell

XU Tuo1, LING Hong-yan1, LONG Jia2, HE Jian-qin1, YANG Si-si1, ZHU Ze-mei1, YAN Can-qun2, FENG Shui-dong3   

  1. 1. Department of Physiology, University of South China, Hengyang 421001, China;
    2. The Second Hospital of University of South China, University of South China, Hengyang 421001, China;
    3. Department of Social Medicine and Health Service Management, University of South China, Hengyang 421001, China
  • Received:2016-11-21 Revised:2017-06-29 Online:2017-11-28 Published:2018-06-19
  • Contact: 奉水东,Tel:86-0734-8281621;E-mail:shuidong_f@hotmail.com E-mail:shuidong_f@hotmail.com
  • Supported by:
    教育部留学归国基金(教外司留[2014]1685号);湖南教育厅(16C1411);衡阳市科技局(2016KJ64)

Abstract: Objective: To observe the effects of lyceum barbarum polysaccharide (LBP) on insulin resistance of HepG2 cells and investigate its possible mechanism.Methods: IR-HepG2 cell model was induced with high glucose and high insulin in combination for 24 hours,with 104/vaccination in the 96-well plates, hole density after adherent cells (30 μg/ml、100 μg/ml、300 μg/ml) LBP cultivate 48 h, 200 μl/hole, each all had four holes. The effects of LBP at different concentrations on HepG2 cell activity and insulin resistance were tested. Intracellular malondialdehyde (MDA) content and superoxide dismutase (SOD) activity were detected. The expressions of related proteins in insulin signal transduction pathways such as insulin receptor substrate-2(IRS-2), phosphatidylinositol-3-kinase(PI3-K), protein kinase B(Akt) and glucose transport-2(GLUT2) were determined.Results: Compared with normal control group, the content of MDA was increased significantly and the activity of SOD and the expression levels of IRS-2,PI-3K,Akt and GLUT2 were decreased significantly in the IR model group. Compared with IR model group, medium and high concentrations of LBP decreased the content of MDA and increased the activity of SOD and the expression levels of IRS-2, PI-3K, Akt and GLUT2 in insulin-resistant HepG2 cells. MTT showed that at the same time, the OD value gradually decreased with the increase of LBP's concentration; under the same concentration of LBP, the OD value also gradually decreased with the extension of time, which indicated that LBP inhibited the proliferation of HepG2 cells with time and concentration-dependent manner. Glucose consumption experiment indicated that medium and high concentration of LBP could increase the glucose consumption of insulin-resistant HepG2 cells significantly, but low concentration of LBP had no significant impacted on glucose consumption of insulin-resistant HepG2 cells.Conclusion: Medium and high concentration of LBP can improve insulin resistance of HepG2 cell, its mechanisns may be associated with decreasing the level of oxidative stress and increasing the protein expressions of insulin signaling pathway.

Key words: lyceum barbarum polysaccharide, HepG2 cell, insulin resistance, oxidative stress, insulin signaling pathway

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