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    Insulin Attenuates Beta-Amyloid-Associated Insulin/Akt/EAAT Signaling Perturbations in Human Astrocytes

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    Han_Springer_2016.pdf (1.523Mb)
    Issue Date
    2016-08
    Author
    Han, Xiaojuan
    Yang, Liling
    Du, Heng
    Sun, Qinjian
    Wang, Xiang
    Cong, Lin
    Liu, Xiaohui
    Yin, Ling
    Li, Shan
    Du, Yifeng
    Publisher
    Springer Verlag
    Type
    Article
    Article Version
    Scholarly/refereed, author accepted manuscript
    Rights
    The final publication is available at Springer via http://dx.doi.org/10.1007/s10571-015-0268-5
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    Abstract
    The excitatory amino acid transporters 1 and 2 (EAAT1 and EAAT2), mostly located on astrocytes, are the main mediators for glutamate clearance in humans. Malfunctions of these transporters may lead to excessive glutamate accumulation and subsequent excitotoxicity to neurons, which has been implicated in many kinds of neurodegenerative disorders including Alzheimer’s disease (AD). Yet, the specific mechanism of the glutamate system dysregulation remains vague. To explore whether the insulin/protein kinase B (Akt)/EAAT signaling in human astrocytes could be disturbed by beta-amyloid protein (Aβ) and be protected by insulin, we incubated HA-1800 cells with varying concentrations of Aβ1–42 oligomers and insulin. Then the alterations of several key substrates in this signal transduction pathway were determined. Our results showed that expressions of insulin receptor, phospho-insulin receptor, phospho-protein kinase B, phospho-mammalian target of rapamycin, and EAAT1 and EAAT2 were decreased by the Aβ1–42 oligomers in a dose-dependent manner (p < 0.05) and this trend could be recovered by insulin treatment (p < 0.05). However, the expressions of total Akt and mTOR were invariant (p > 0.05), and the mRNA levels of EAAT1 and EAAT2 were also unchanged (p > 0.05). Taken together, this study indicates that Aβ1–42 oligomers could cause disturbances in insulin/Akt/EAAT signaling in astrocytes, which might be responsible for AD onset and progression. Additionally, insulin can exert protective functions to the brain by modulating protein modifications or expressions.
    URI
    http://hdl.handle.net/1808/24880
    DOI
    https://doi.org/10.1007/s10571-015-0268-5
    Collections
    • Higuchi Biosciences Center Scholarly Works [54]
    Citation
    Han, X., Yang, L., Du, H., Sun, Q., Wang, X., Cong, L., … Du, Y. (2016). Insulin Attenuates Beta-Amyloid-Associated Insulin/Akt/EAAT Signaling Perturbations in Human Astrocytes. Cellular and Molecular Neurobiology, 36(6), 851–864. http://doi.org/10.1007/s10571-015-0268-5

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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