DAPK1 interaction with NMDA receptor NR2B subunits mediates brain damage in stroke.

DAPK1 interaction with NMDA receptor NR2B subunits mediates brain damage in stroke.
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DOI:
10.1016/j.cell.2009.12.055
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发表时间:
2010-01-22
期刊:
影响因子:
64.5
通讯作者:
Lu Y
Lu Y
中科院分区:
生物学1区
文献类型:
--
作者:
Tu W;Xu X;Peng L;Zhong X;Zhang W;Soundarapandian MM;Balel C;Wang M;Jia N;Zhang W;Lew F;Chan SL;Chen Y;Lu Y

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N-甲基-D-天冬氨酸(NMDA)受体是突触外谷氨酸受体的一个主要亚型,连接着导致神经元不可逆性死亡的多种细胞内分解代谢过程。在这里,我们报告了脑缺血将死亡相关蛋白激酶1(DAPK1)招募到成年小鼠大脑皮质的NMDA受体NR2B蛋白复合体中。DAPK1直接与NMDA受体NR2B由1292-1304氨基酸组成的C端尾(NR2BCT)结合。一个结构性活性的DAPK1使Ser-1303上的NR2B亚基磷酸化,进而增强NR1/NR2B受体的通道电导。DAPK1的基因缺失或在小鼠体内将激活的DAPK1与NMDA受体NR2B亚单位解偶联的NR2BCT可阻止突触外NMDA受体通道的损伤性钙内流,并保护神经元免受脑缺血损伤。因此,DAPK1在物理和功能上与NMDA受体NR2B亚单位在突触外位置相互作用,这种相互作用是中风损伤的中心媒介。
N-methyl-D-aspartate (NMDA) receptors constitute a major subtype of glutamate receptors at extra-synaptic sites that link multiple intracellular catabolic processes responsible for irreversible neuronal death. Here, we report that cerebral ischemia recruits death-associated protein kinase 1 (DAPK1) into the NMDA receptor NR2B protein complex in the cortex of adult mice. DAPK1 directly binds with the NMDA receptor NR2B C-terminal tail consisting of amino acid 1292–1304 (NR2BCT). A constitutively active DAPK1 phosphorylates NR2B subunit at Ser-1303 and in turn enhances the NR1/NR2B receptor channel conductance. Genetic deletion of DAPK1 or administration of NR2BCT that uncouples an activated DAPK1 from an NMDA receptor NR2B subunit in vivo in mice blocks injurious Ca2+ influx through NMDA receptor channels at extrasynaptic sites and protects neurons against cerebral ischemic insults. Thus, DAPK1 physically and functionally interacts with the NMDA receptor NR2B subunit at extra-synaptic sites and this interaction acts as a central mediator for stroke damage.
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