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  • Title: Asymmetric dimethylarginine impairs glucose utilization via ROS/TLR4 pathway in adipocytes: an effect prevented by vitamin E.
    Author: Yang ZC, Wang KS, Wu Y, Zou XQ, Xiang YY, Chen XP, Li YJ.
    Journal: Cell Physiol Biochem; 2009; 24(1-2):115-24. PubMed ID: 19590199.
    Abstract:
    BACKGROUND: Asymmetric dimethylarginine (ADMA), the inhibitor of nitric oxide synthase (NOS), has been reported to be associated with glucose metabolism, but its mechanisms remain unknown. METHODS: In 3T3-L1 adipocytes, we measured the effects of ADMA on glucose transport process under basal or insulin-induced condition, and examined the production of nitric oxide (NO), reactive oxygen species (ROS) and tumor necrosis factor alpha (TNF-alpha), and the expression of toll-like receptor 4 (TLR4). RESULTS: ADMA significantly impaired basal or insulin-stimulated 2-deoxy- [3H] glucose uptake, and decreased the expression of insulin receptor substrate-1 (IRS-1) and glucose transporter-4 (GLUT4). Phosphorylated protein of IRS-1 and translocation of GLUT4 with insulin-stimulation were also inhibited by ADMA. NO decreased, while production of ROS and TNF-alpha, and expression of TLR4 increased after ADMA treatment. Vitamin E reduced the effects of ADMA on glucose transport system, and on NO, ROS and TLR4. Moreover, vitamin E decreased ADMA contents by up-regulating dimethylarginine dimethylaminohydrolase (DDAH) activity in adipocytes. Though L-arginine also increased NO level, but failed to reduce the effects of ADMA. CONCLUSION: ADMA significantly impairs both basal and insulin-stimulated glucose transport in adipocytes, which may relate to activation of the ROS/TLR4 pathway.
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