Growth factor-dependent trafficking of cerebellar NMDA receptors via protein kinase B/Akt phosphorylation of NR2C.

Growth factor-dependent trafficking of cerebellar NMDA receptors via protein kinase B/Akt phosphorylation of NR2C.
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DOI:
10.1016/j.neuron.2009.04.015
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发表时间:
2009-05-28
期刊:
影响因子:
16.2
通讯作者:
Roche, Katherine W.
Roche, Katherine W.
中科院分区:
医学1区
文献类型:
--
作者:
Chen, Bo-Shiun;Roche, Katherine W.

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NMDA受体亚单位的组成在整个大脑中各不相同,提供了NMDA受体功能的分子多样性。NR2亚基(NR2a-D)在很大程度上决定了NMDA受体的不同功能特性,并以不同的方式调节受体的运输。尽管NR2C亚基在小脑颗粒细胞中高度丰富,并在小脑功能中发挥独特的作用,但对NR2C对NMDA受体的特异性调控知之甚少。在这里,我们证明了PKB/Akt直接磷酸化丝氨酸1096上的NR2C(S1096)。此外,我们还发现14-3-3ε是一种新的NR2C相互作用因子,其结合依赖于S1096的磷酸化。生长因子刺激和NMDA受体活性均导致S1096上NR2C的磷酸化和小脑NMDA受体表面表达的显著增加。最后,我们发现,与NR2A和NR2B不同,NR2C的表达支持神经元存活。因此,我们的数据提供了生长因子刺激和小脑NMDA受体调节之间的直接机制联系。
NMDA receptor subunit composition varies throughout the brain, providing molecular diversity in NMDA receptor function. The NR2 subunits (NR2A-D) in large part dictate the distinct functional properties of NMDA receptors and differentially regulate receptor trafficking. Although the NR2C subunit is highly enriched in cerebellar granule cells and plays a unique role in cerebellar function, little is known about NR2C-specific regulation of NMDA receptors. Here we demonstrate that PKB/Akt directly phosphorylates NR2C on serine 1096 (S1096). In addition, we identify 14-3-3ε as a novel NR2C interactor, whose binding is dependent on S1096 phosphorylation. Both growth factor stimulation and NMDA receptor activity lead to a robust increase in both phosphorylation of NR2C on S1096 and surface expression of cerebellar NMDA receptors. Finally, we find that NR2C expression, unlike NR2A and NR2B, supports neuronal survival. Thus, our data provide a direct mechanistic link between growth factor stimulation and regulation of cerebellar NMDA receptors.
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