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

Neurosci Lett. 1996 Jan 26;203(3):211-3. doi: 10.1016/0304-3940(96)12301-6.


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 mu M) potentiated responses to NMDA (15-25 mu M), giving a dose ratio of 0.84 +/- 0.02. The mGluR group I specific agonist (RS3,5-dihydroxyphenylglycine (DHPG) (3-10 mu M) also induced a dose-dependent and reversible enhancement of responses to NMDA (dose ratio for 10 mu M 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 mu M) and the group III specific agonist (S)-2-amino-4-phosphonobutanoate (L-AP4; 50 mu M) caused little or no potentiation of responses to NMDA. The potentiation induced by 3-5 mu M DHPG was reversibly antagonised by the group I and II antagonist (+)-alpha-methyl-4-carboxyphenylglycine ((+)-MCPG; 1 mM). The present findings demonstrate that activation of group I mGluRs enhance NMDA responses in the hippocampus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Dose-Response Relationship, Drug
  • Female
  • Hippocampus / drug effects*
  • Membrane Potentials / drug effects
  • N-Methylaspartate / pharmacology*
  • Rats
  • Rats, Wistar
  • Receptors, Metabotropic Glutamate / drug effects*


  • Receptors, Metabotropic Glutamate
  • N-Methylaspartate