Leptin inhibits glycogen synthase kinase-3beta to prevent tau phosphorylation in neuronal cells.

Leptin inhibits glycogen synthase kinase-3beta to prevent tau phosphorylation in neuronal cells.
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DOI:
10.1016/j.neulet.2009.03.066
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发表时间:
2009-05-22
影响因子:
2.5
通讯作者:
Tezapsidis N
Tezapsidis N
中科院分区:
医学4区
文献类型:
--
作者:
Greco SJ;Sarkar S;Casadesus G;Zhu X;Smith MA;Ashford JW;Johnston JM;Tezapsidis N

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我们之前已经证明,瘦素在体外和体内都能减少细胞外淀粉样β(Aβ)蛋白,并在体外减少细胞内tau蛋白磷酸化。此外,我们已经表明,这些影响是依赖于AMP激活蛋白激酶(AMPK)在体外的激活。在此,我们研究了与tau磷酸化直接相关的AMPK信号传导的下游效应物。与阿尔茨海默病(AD)相关的一个这样的靶标可以是GSK-3β,其已被证明被瘦素灭活。因此,我们剖析了GSK-3β在介导瘦素降低神经元细胞中tau磷酸化的能力中的作用。我们的数据表明,瘦素通过AMPK和GSK-3β调节tau蛋白磷酸化。这是基于以下内容:瘦素和细胞渗透性AMPK激活剂5-氨基咪唑-4-羧酰胺核糖核苷(AICAR)减少AD相关位点的tau磷酸化,与GSK-3β抑制剂氯化锂(LiCl)相似。此外,这种tau磷酸化的减少通过GSK-3β的下调来模拟,使用siRNA技术实现,并通过GSK-3β的异位过表达来拮抗。这些研究提供了进一步了解瘦素在改善AD相关通路中的作用机制。
We have previously demonstrated that Leptin reduces extracellular amyloid β (Aβ) protein both in vitro and in vivo, and intracellular tau phosphorylation in vitro. Further, we have shown that these effects are dependent on activation of AMP-activated protein kinase (AMPK) in vitro. Herein, we investigated downstream effectors of AMPK signaling directly linked to tau phosphorylation. One such target, of relevance to Alzheimer’s disease (AD), may be GSK-3β, which has been shown to be inactivated by Leptin. We therefore dissected the role of GSK-3β in mediating Leptin’s ability to reducing tau phosphorylation in neuronal cells. Our data suggest that Leptin regulates tau phosphorylation through a pathway involving both AMPK and GSK-3β. This was based on the following: Leptin and the cell-permeable AMPK activator, 5-aminoimidazole-4-carboxyamide ribonucleoside (AICAR), reduced tau phosphorylation at AD-relevant sites similarly to the GSK-3β inhibitor, lithium chloride (LiCl). Further, this reduction of tau phosphorylation was mimicked by the downregulation of GSK-3β, achieved using siRNA technology and antagonized by the ectopic overexpression of GSK-3β. These studies provide further insight into Leptin’s mechanism of action in ameliorating AD-related pathways.
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