mGluR5 and NMDA receptors drive the experience- and activity-dependent NMDA receptor NR2B to NR2A subunit switch.

mGluR5 and NMDA receptors drive the experience- and activity-dependent NMDA receptor NR2B to NR2A subunit switch.
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DOI:
10.1016/j.neuron.2011.02.045
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发表时间:
2011-04-28
期刊:
影响因子:
16.2
通讯作者:
Isaac JT
Isaac JT
中科院分区:
医学1区
文献类型:
--
作者:
Matta JA;Ashby MC;Sanz-Clemente A;Roche KW;Isaac JT

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在大脑皮层中,由活动和感觉体验驱动,从包含 NR2B 的 NMDA 受体(NMDAR)到包含 NR2A 的 NMDA 受体(NMDAR)发生发育转变。该亚基开关改变 NMDAR 功能,影响突触可塑性,其失调与神经系统疾病有关。然而,驱动子单元开关的机制尚不清楚。在这里,我们在海马 CA1 锥体神经元中显示,由活动急剧驱动的 NR2B- 到 NR2A 转换需要 NMDAR 和 mGluR5 的激活,涉及 PLC、IP3R 依赖性储存的 Ca2+ 释放和 PKC 活动。在 mGluR5 敲除小鼠中,CA1 中的发育性 NR2B-NR2A 开关存在缺陷。此外,在 mGluR5 敲除小鼠的视觉皮层中,不存在由视觉体验在体内诱发的 NR2B-NR2A 开关。因此,我们确定 mGluR5 和 NMDAR 是活性依赖性 NR2B-NR2A 转换所必需的,并且在体内 NMDAR 亚基组成的经验依赖性调节中发挥着关键作用。
In cerebral cortex there is a developmental switch from NR2B- to NR2A-containing NMDA receptors (NMDARs) driven by activity and sensory experience. This subunit switch alters NMDAR function, influences synaptic plasticity, and its dysregulation is associated with neurological disorders. However, the mechanisms driving the subunit switch are not known. Here we show in hippocampal CA1 pyramidal neurons that the NR2B- to NR2A switch driven acutely by activity requires activation of NMDARs and mGluR5, involves PLC, Ca2+ release from IP3R-dependent stores and PKC activity. In mGluR5 knock-out mice the developmental NR2B-NR2A switch in CA1 is deficient. Moreover, in visual cortex of mGluR5 knock-out mice the NR2B-NR2A switch evoked in vivo by visual experience is absent. Thus we establish that mGluR5 and NMDARs are required for the activity-dependent NR2B-NR2A switch and play a critical role in experience-dependent regulation of NMDAR subunit composition in vivo.
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