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Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons

NMDA receptors are important elements in pain signaling in the spinal cord dorsal horn. They are heterotetramers typically composed of two NR1 and two of four NR2 subunits: NR2A-2D. Mice lacking specific NR2 subunits show deficits in pain transmission yet subunit location in the spinal cord remains...

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Autores principales: Tong, Chi-Kun, Kaftan, Edward J, MacDermott, Amy B
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2572590/
https://www.ncbi.nlm.nih.gov/pubmed/18847474
http://dx.doi.org/10.1186/1744-8069-4-44
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author Tong, Chi-Kun
Kaftan, Edward J
MacDermott, Amy B
author_facet Tong, Chi-Kun
Kaftan, Edward J
MacDermott, Amy B
author_sort Tong, Chi-Kun
collection PubMed
description NMDA receptors are important elements in pain signaling in the spinal cord dorsal horn. They are heterotetramers typically composed of two NR1 and two of four NR2 subunits: NR2A-2D. Mice lacking specific NR2 subunits show deficits in pain transmission yet subunit location in the spinal cord remains unclear. We have combined electrophysiological and pharmacological approaches to investigate the composition of functional NMDA receptors expressed by lamina I, substance P receptor-expressing (NK1R+) neurons, as well as NK1R- neurons. Under low Mg(2+ )conditions (100 μM), the conductance of NMDA receptors at -90 mV (g(-90 mV)) with NR2A or NR2B subunits (NR2A/B) is low compared to conductance measured at the membrane potential where the inward current is maximal or maximal inward current (MIC) (ratio of ~0.07 calculated from Kuner and Schoepfer, 1996). For NR2C or NR2D subunits (NR2C/D), the ratio is higher (ratio ~0.4). NK1R+ and NK1R- neurons express NMDA receptors that give ratios ~0.28 and 0.16, respectively, suggesting both types of subunits are present in both populations of neurons, with NK1R+ neurons expressing a higher percentage of NR2C/D type NMDA receptors. This was confirmed using EAB318, an NR2A/B preferring antagonist, and UBP141, a mildly selective NR2C/D antagonist to increase and decrease the g(-90 mV)/g(MIC) ratios in both subpopulations of neurons.
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spelling pubmed-25725902008-10-25 Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons Tong, Chi-Kun Kaftan, Edward J MacDermott, Amy B Mol Pain Research NMDA receptors are important elements in pain signaling in the spinal cord dorsal horn. They are heterotetramers typically composed of two NR1 and two of four NR2 subunits: NR2A-2D. Mice lacking specific NR2 subunits show deficits in pain transmission yet subunit location in the spinal cord remains unclear. We have combined electrophysiological and pharmacological approaches to investigate the composition of functional NMDA receptors expressed by lamina I, substance P receptor-expressing (NK1R+) neurons, as well as NK1R- neurons. Under low Mg(2+ )conditions (100 μM), the conductance of NMDA receptors at -90 mV (g(-90 mV)) with NR2A or NR2B subunits (NR2A/B) is low compared to conductance measured at the membrane potential where the inward current is maximal or maximal inward current (MIC) (ratio of ~0.07 calculated from Kuner and Schoepfer, 1996). For NR2C or NR2D subunits (NR2C/D), the ratio is higher (ratio ~0.4). NK1R+ and NK1R- neurons express NMDA receptors that give ratios ~0.28 and 0.16, respectively, suggesting both types of subunits are present in both populations of neurons, with NK1R+ neurons expressing a higher percentage of NR2C/D type NMDA receptors. This was confirmed using EAB318, an NR2A/B preferring antagonist, and UBP141, a mildly selective NR2C/D antagonist to increase and decrease the g(-90 mV)/g(MIC) ratios in both subpopulations of neurons. BioMed Central 2008-10-10 /pmc/articles/PMC2572590/ /pubmed/18847474 http://dx.doi.org/10.1186/1744-8069-4-44 Text en Copyright © 2008 Tong et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Tong, Chi-Kun
Kaftan, Edward J
MacDermott, Amy B
Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons
title Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons
title_full Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons
title_fullStr Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons
title_full_unstemmed Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons
title_short Functional identification of NR2 subunits contributing to NMDA receptors on substance P receptor-expressing dorsal horn neurons
title_sort functional identification of nr2 subunits contributing to nmda receptors on substance p receptor-expressing dorsal horn neurons
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2572590/
https://www.ncbi.nlm.nih.gov/pubmed/18847474
http://dx.doi.org/10.1186/1744-8069-4-44
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