兴奋性氨基酸转运体2在神经退行性变中的作用
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许保磊(1980-),男,在读博士研究生,研究方向:神经元退行性变的发生机制和防治策略。

基金项目:

北京市自然科学基金(编号:7082043);首都卫生发展科研专项项目(编号:2011-1001-02);北京市卫生系统高层次卫生技术人才计划资助项目(编号:2009-3-64)。


Role of EAAT2 in Neurodegenerative Diseases
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    摘要:

    谷氨酸是脑内必需的兴奋性神经递质之一,兴奋性氨基酸转运体(Excitatory amino acid transporter EAAT)2是最主要的谷氨酸转运体,负责脑内90%以上的谷氨酸再摄取,调节突触间隙的谷氨酸浓度。EAAT2功能紊乱导致胞外谷氨酸过量积聚,在多种神经退行性疾病的发病过程中起重要作用,如阿尔茨海默病、亨廷顿舞蹈病、肌萎缩侧索硬化等。对于人EAAT2启动子的研究发现,NF-kB在星形胶质细胞中对EAAT2表达起关键作用。通过筛选1 040种FDA批准的化合物,发现多种β-内酰胺类抗生素如头孢曲松钠等是EAAT2的转录激活剂,可以增加EAAT2的蛋白表达水平,产生神经保护作用。

    Abstract:

    Glutamate is an essential excitatory neurotransmitter regulating brain functions. Excitatory amino acid transporter (EAAT)-2 is one of the major glutamate transporters expressed predominantly in astroglial cells and is responsible for 90% of total glutamate uptake. Glutamate transporters tightly regulate glutamate concentration in the synaptic cleft. Dysfunction of EAAT2 and accumulation of excessive extracellular glutamate has been implicated in the development of several neurodegenerative diseases including Alzheimer’s disease, Huntington’s disease, and amyotrophic lateral sclerosis. Analysis of the human EAAT2 promoter showed that NF-kB is an important regulator of EAAT2 expression in astrocytes. Screening of approximately 1,0 FDA-approved compounds led to the discovery that many b-lactam antibiotics such as ceftriaxone etc. are transcriptional activators of EAAT2 resulting in increased EAAT2 protein levels and produce neuroprotective effects.

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许保磊,王蓉.兴奋性氨基酸转运体2在神经退行性变中的作用[J].中国比较医学杂志,2012,(10):67~71.

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