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Mg2+ block properties of triheteromeric GluN1-GluN2B-GluN2D NMDA receptors on neonatal rat substantia nigra pars compacta dopaminergic neurones
Huang, Zhuo1; Gibb, Alasdair J.2
刊名JOURNAL OF PHYSIOLOGY-LONDON
2014-05-15
DOI10.1113/jphysiol.2013.267864
592期:10页:2059-2078
收录类别SCI
文章类型Article
WOS标题词Science & Technology
类目[WOS]Neurosciences ; Physiology
研究领域[WOS]Neurosciences & Neurology ; Physiology
关键词[WOS]METHYL-D-ASPARTATE ; HIPPOCAMPAL-NEURONS ; FIRING PATTERN ; CHANNEL BLOCK ; NR2D SUBUNIT ; EXPRESSION ; GLUTAMATE ; IFENPRODIL ; MEMANTINE ; SUBTYPES
英文摘要

Key points

NMDAR receptors (NMDARs) are tetrameric cation channels permeable to calcium and blocked by Mg2+. Voltage-dependent Mg2+ block of NMDARs is crucial to several forms of synaptic plasticity and to the integration of synaptic activity with neuronal activity. Although diheteromeric GluN1-GluN2A or GluN1-GluN2B NMDARs display stronger voltage-dependent Mg2+ block than GluN1-GluN2C or GluN1-GluN2D NMDARs, the extracellular Mg2+ block properties for triheteromeric NMDARs are still elusive. Here, we show that in dopaminergic neurones the voltage dependence of Mg2+ block is less steep than previously observed in hippocampus or cortex, consistent with the presence of triheteromeric GluN1-GluN2B-GluN2D NMDARs. These results may help to understand the role of triheteromeric NMDARs in dopaminergic neurone synaptic plasticity and to inform simulations of dopaminergic neurone physiology. Native NMDA receptors (NMDARs) are tetrameric channels formed by two GluN1 and two GluN2 subunits. So far, seven NMDARs subunits have been identified and they can form diheteromeric or triheteromeric NMDARs (more than one type of GluN2 subunit). Extracellular Mg2+ is an important regulator of NMDARs, and particularly the voltage dependence of Mg2+ block is crucial to the roles of NMDARs in synaptic plasticity and the integration of synaptic activity with neuronal activity. Although the Mg2+ block properties of diheteromeric NMDARs are fully investigated, properties of triheteromeric NMDARs are still not clear. Our previous data suggested that dopaminergic neurones expressed triheteromeric GluN1-GluN2B-GluN2D NMDARs. Here, using NMDARs in dopaminergic neurones from postnatal day 7 (P7) rats as a model system, we characterize the voltage-dependent Mg2+ block properties of triheteromeric NMDARs. In control conditions, external Mg2+ significantly inhibits the whole cell NMDA-evoked current in a voltage-dependent manner with IC50 values of 20.9 mu m, 53.3 mu m and 173 mu m at -90mV, -70mV and -50mV, respectively. When the GluN2B-selective antagonist ifenprodil was applied, the Mg2+ sensitivity of the residual NMDA-mediated currents (which is mainly carried by GluN1-GluN2B-GluN2D NMDARs) is reduced to IC50 values of 45.9 mu m (-90mV), 104 mu m (-70mV) and 276 mu m (-50mV), suggesting that triheteromeric GluN1-GluN2B-GluN2D NMDARs have less affinity for external Mg2+ than GluN1-GluN2B receptors. In addition, fitting I-NMDA-V curves with a trapping Mg2+ block model shows the triheteromeric GluN1-GluN2B-GluN2D NMDARs have weaker voltage-dependent Mg2+ block (delta=0.56) than GluN1-GluN2B NMDARs. Finally, our concentration jump and single channel recordings suggest that GluN1-GluN2B-GluN2D rather than GluN1-GluN2D NMDARs are present. These data provide information relevant to Mg2+ block characteristics of triheteromeric NMDARs and may help to better understand synaptic plasticity, which is dependent on these triheteromeric NMDARs.

语种英语
WOS记录号WOS:000335862500005
资助机构Wellcome Trust
引用统计
被引频次:13[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bjmu.edu.cn/handle/400002259/63603
专题北京大学药学院
北京大学药学院_分子与细胞药理学系
作者单位1.Peking Univ, Sch Pharmaceut Sci, State Key Lab Nat & Biomimet Drugs, Dept Mol & Cellular Pharmacol, Beijing 100191, Peoples R China
2.UCL, Dept Neurosci Physiol & Pharmacol, London WC1E 6BT, England
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GB/T 7714
Huang, Zhuo,Gibb, Alasdair J.. Mg2+ block properties of triheteromeric GluN1-GluN2B-GluN2D NMDA receptors on neonatal rat substantia nigra pars compacta dopaminergic neurones[J]. JOURNAL OF PHYSIOLOGY-LONDON,2014,592(10):2059-2078.
APA Huang, Zhuo,&Gibb, Alasdair J..(2014).Mg2+ block properties of triheteromeric GluN1-GluN2B-GluN2D NMDA receptors on neonatal rat substantia nigra pars compacta dopaminergic neurones.JOURNAL OF PHYSIOLOGY-LONDON,592(10),2059-2078.
MLA Huang, Zhuo,et al."Mg2+ block properties of triheteromeric GluN1-GluN2B-GluN2D NMDA receptors on neonatal rat substantia nigra pars compacta dopaminergic neurones".JOURNAL OF PHYSIOLOGY-LONDON 592.10(2014):2059-2078.
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