Activation of group I mGluRs potentiates NMDA responses in rat hippocampal slices

Stephen M. Fitzjohn (Lead / Corresponding author), Andy J. Irving, Mary J. Palmer, Jenni Harvey, David Lodge, Graham L. Collingridge

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Abstract

The pharmacology of the metabotropic glutamate receptor (mGluR)-mediated potentiation of N-methyl-D-aspartate (NMDA)evoked depolarisations in the CA1 region of rat hippocampal slices was investigated using an extracellular grease-gap method. The group I and II mGluR agonist (1S,3R)-1-aminocyclopentane-1,3-dicarboxylic acid ((1S,3R)-ACPD; 10 μM) potentiated responses to NMDA (15-25 μM), giving a dose ratio of 0.84 ± 0.02. The mGluR group I specific agonist (RS3,5-dihydroxyphenylglycine (DHPG) (3-10 μM) also induced a dose-dependent and reversible enhancement of responses to NMDA (dose ratio for 10 μM DHPG was 0.77 ± 0.02). In contrast, the group II selective agonist (2S,1'R,2'R,3'R)-2-(2',3'-dicarboxycyclopropyl)glycine (DCG-IV; 0.5-1 μM) and the group III specific agonist (S)-2-amino-4-phosphonobutanoate (L-AP4; 50 μM) caused little or no potentiation of responses to NMDA. The potentiation induced by 3-5 μM DHPG was reversibly antagonised by the group I and II antagonist (+)-α-methyl-4-carboxyphenylglycine ((+)-MCPG; 1 mM). The present findings demonstrate that activation of group I mGluRs enhance NMDA responses in the hippocampus.

Original languageEnglish
Pages (from-to)211-213
Number of pages3
JournalNeuroscience Letters
Volume203
Issue number3
DOIs
Publication statusPublished - 26 Jan 1996

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Keywords

  • (RS)-3,5-Dihydroxyphenylglycine
  • Glutamate
  • Hippocampus
  • Metabotropic glutamate receptor
  • N-Methyl-D-aspartate

Cite this

Fitzjohn, S. M., Irving, A. J., Palmer, M. J., Harvey, J., Lodge, D., & Collingridge, G. L. (1996). Activation of group I mGluRs potentiates NMDA responses in rat hippocampal slices. Neuroscience Letters, 203(3), 211-213. https://doi.org/10.1016/0304-3940(96)12301-6