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The Journal of Neuroscience, July 4, 2007, 27(27):7130-7135; doi:10.1523/JNEUROSCI.1150-07.2007

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Brief Communications
Acute Stress Facilitates Hippocampal CA1 Metabotropic Glutamate Receptor-Dependent Long-Term Depression

Francis Chaouloff,¹ Agnès Hémar,^1 * and Olivier Manzoni^2 *

¹Centre National de la Recherche Scientifique Unité Mixte de Recherche 5091 "Physiologie Cellulaire de la Synapse," and ²Inserm Unité 862, Equipe "Physiopathologie de la Transmission et de la Plasticité Synaptique," Institut François Magendie, 33077 Bordeaux, France

Correspondence should be addressed to Dr. Francis Chaouloff, Inserm Unité 862, Equipe AVENIR "Mécanismes Moléculaires de l'Adaptation Comportementale," Institut François Magendie, 146 rue Léo Saignat, 33077 Bordeaux Cédex, France. Email: francis.chaouloff{at}bordeaux.inserm.fr

Acute stress affects NMDA receptor (NMDAR)-dependent synaptic plasticity in the CA1 region of the hippocampus, with long-term potentiation and long-term depression (LTD) being, respectively, diminished and facilitated by acute exposure to stress. Here, we examined whether this facilitatory effect of stress on NMDAR-dependent LTD extends to metabotropic glutamate receptor (mGluR)-dependent LTD at Schaffer collateral–CA1 synapses. Application of a low dose (50 µM) of the selective group 1 mGluR agonist (RS)-3,5-dihydroxyphenylglycine (DHPG) promoted LTD in slices from stressed, but not from control, rats. Pretreatment of stressed rats with the glucocorticoid receptor (GR) antagonist RU38486 prevented the facilitation of DHPG-induced LTD (DHPG-LTD), indicating the involvement of corticosterone secretion and, in turn, stimulation of GRs. Finally, pretreatment of slices with an mGluR1, but not an mGluR5, antagonist blunted the sensitizing effect of stress on DHPG-LTD. These results indicate that acute stress, through corticosterone stimulation of GRs, facilitates the expression of mGluR1-dependent DHPG-LTD in the hippocampal CA1 region.

Key words: metabotropic glutamate receptor; long-term depression; acute stress; glucocorticoid receptor; hippocampus; CA1

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Received March 14, 2007; revised May 10, 2007; accepted May 30, 2007.

Correspondence should be addressed to Dr. Francis Chaouloff, Inserm Unité 862, Equipe AVENIR "Mécanismes Moléculaires de l'Adaptation Comportementale," Institut François Magendie, 146 rue Léo Saignat, 33077 Bordeaux Cédex, France. Email: francis.chaouloff{at}bordeaux.inserm.fr

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