HIV-1 Tat inhibits EAAT-2 through AEG-1 upregulation in models of HIV-associated neurocognitive disorder.

HIV-1 Tat inhibits EAAT-2 through AEG-1 upregulation in models of HIV-associated neurocognitive disorder.
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DOI:
10.18632/oncotarget.16485
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发表时间:
2017-06-13
期刊:
影响因子:
--
通讯作者:
Xing HQ
Xing HQ
中科院分区:
其他
文献类型:
--
作者:
Ye X;Zhang Y;Xu Q;Zheng H;Wu X;Qiu J;Zhang Z;Wang W;Shao Y;Xing HQ

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在HIV相关性神经认知障碍(HAND)中,星形胶质细胞质膜兴奋性氨基酸转运体2(EAAT-2)的减少导致细胞外谷氨酸水平升高,进而导致神经元凋亡。我们利用免疫组织化学、Western印迹、qRT-PCR和RNA干扰等方法,从组织和细胞水平阐明了手部EAAT-2表达降低的分子机制。我们使用猴免疫缺陷病毒-人类免疫缺陷病毒嵌合病毒(SHIV)感染的猕猴作为手部的活体模型。我们的结果显示,大脑皮层EAAT-2的表达降低,而AEG-1的表达增加,并且这些蛋白的表达水平呈负相关。体外分析表明,HIV-1Tat通过诱导AEG-1的过度表达而抑制EAAT-2的表达。更具体地说,HIV-1Tat通过PI3-K信号通路增加AEG-1的表达,而银炎1号(YY-1)通过NF-κB信号通路增加对EAAT-2的抑制。这些结果值得检测AEG-1作为治疗手部疾病的潜在治疗靶点。
During HIV-associated neurocognitive disorder (HAND), decreasing in excitatory amino acid transporter 2 (EAAT-2) in astrocyte plasma membranes leads to elevated levels of extracellular glutamate and, in turn, neuronal apoptosis. We used immunohistochemistry, western blot, qRT-PCR, and RNA interference to elucidate the molecular mechanisms underlying the decreased EAAT-2 expression during HAND at the tissue and cellular levels. We used simian immunodeficiency virus-human immunodeficiency virus chimeric virus (SHIV)-infected macaques as an in vivo model of HAND. Our results show that EAAT-2 expression was decreased in the cerebral cortex, while AEG-1 expression was increased, and the expression levels of these proteins were negatively correlated. In vitro analyses showed that HIV-1 Tat inhibited EAAT-2 expression by inducing overexpression of AEG-1. More specifically, HIV-1 Tat increased AEG-1 expression via the PI3-K signaling pathway, while increasing EAAT-2 inhibition by YinYan-1 (YY-1) via the NF-κB signaling pathway. These results warrant testing AEG-1 as a potential therapeutic target for treating HAND.
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