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  Triheteromeric NR1/NR2A/NR2B receptors constitute the major N-methyl-D-aspartate (NMDA) receptor population in adult hippocampal synapses

Rauner, C., & Köhr, G. (2011). Triheteromeric NR1/NR2A/NR2B receptors constitute the major N-methyl-D-aspartate (NMDA) receptor population in adult hippocampal synapses. The Journal of Biological Chemistry, 286(9), 7558-7566. doi:10.1074/jbc.M110.182600.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-1EB3-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-1EB4-A
Genre: Journal Article
Alternative Title : Triheteromeric NR1/NR2A/NR2B receptors constitute the major N-methyl-D-aspartate (NMDA) receptor population in adult hippocampal synapses

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Rauner, Claudia1, Author              
Köhr, Georg1, Author              
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1Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Max Planck Society, ou_1497704              

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Free keywords: Brain ; Gene knockout ; Glutamate receptors ionotropic (AMPA, NMDA) ; Neuron ; Receptor regulation ; NMDA receptor subtype ; kinetics ; postnatal development ; synaptic transmission ; triheteromeric
 Abstract: NMDARs, fundamental to learning and memory and implicated in certain neurological disorders, are heterotetrameric complexes composed of two NR1 and two NR2 subunits. The function of synaptic NMDARs in postnatal principal forebrain neurons is typically attributed to diheteromeric NR1/NR2A and NR1/NR2B receptors, despite compelling evidence for triheteromeric NR1/NR2A/NR2B receptors. In synapses, the properties of triheteromeric NMDARs could thus far not be distinguished from those of mixtures of diheteromeric NMDARs. To find a signature of NR1/NR2A/NR2B receptors, we have employed two gene−targeted mouse lines, expressing either NR1/NR2A or NR1/NR2B receptors without NR1/NR2A/NR2B receptors, and compared their synaptic properties to those of wild type. In acute hippocampal slices of mutants older than four weeks we found a distinct voltage dependence of NMDA EPSC decay time for the two diheteromeric NMDARs. In wild−type mice, NMDA EPSCs unveiled the NR1/NR2A characteristic for this voltage−dependent deactivation exclusively, indicating that the contribution of NR1/NR2B receptors to evoked NMDA EPSCs is negligible in adult CA3−to−CA1 synapses. The presence of NR1/NR2A/NR2B receptors was obvious from properties that could not be explained by a mixture of diheteromeric NR1/NR2A and NR1/NR2B receptors or by presence of NR1/NR2A receptors alone. The decay time for NMDA EPSCs in wild type was slower than that for NR1/NR2A receptors and the sensitivity of NMDA EPSCs to NR2Bdirected NMDAR antagonists was 50%. Thus, NR2B is prominent in adult hippocampal synapses as an integral part of NR1/NR2A/NR2B receptors

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Language(s): eng - English
 Dates: 2010-11-182010-09-072010-12-292010-12-292011-03-04
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
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Title: The Journal of Biological Chemistry
  Other : JBC
Source Genre: Journal
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Publ. Info: Baltimore, etc. : American Society for Biochemistry and Molecular Biology [etc.]
Pages: - Volume / Issue: 286 (9) Sequence Number: - Start / End Page: 7558 - 7566 Identifier: ISSN: 0021-9258
CoNE: https://pure.mpg.de/cone/journals/resource/954925410826_1