Back to Search
Start Over
Differential regulation of synaptic transmission by mGlu2 and mGlu3 at the perforant path inputs to the dentate gyrus and CA1 revealed in mGlu2 -/- mice
- Source :
- Neuropharmacology. 43:215-221
- Publication Year :
- 2002
- Publisher :
- Elsevier BV, 2002.
-
Abstract
- Group II metabotropic glutamate (mGlu) receptors can act as presynaptic autoinhibitory receptors at perforant path inputs to the hippocampus under conditions of high frequency synaptic activation. We have used mGlu2 -/- mice to examine the relative roles of mGlu2 and mGlu3 in the regulation of perforant path synaptic transmission mediated by both the selective group II receptor agonist, DCG-IV, and by synaptically released glutamate. Field excitatory postsynaptic potentials evoked by stimulation of either the perforant path inputs to the dentate gyrus mid-moleculare or the CA1 stratum lacunosum moleculare were inhibited by DCG-IV with IC(50) values and maximum percentage inhibition of: 169 nM (60%) and 41 nM (72%) in wild-type mice and 273 nM (19%) and 116 nM (49%) in mGlu2 -/- mice, respectively. Activation of presynaptic group II mGlu autoreceptors by synaptically released glutamate, as revealed by a LY341495-mediated increase in the relative amplitude of a test fEPSP evoked after a conditioning burst, was observed in both the dentate gyrus and the stratum lacunosum of wild-type, but not mGlu2 -/- mice. These observations demonstrate that activation of mGlu3 receptors can regulate synaptic transmission at perforant path synapses but suggest that mGlu2 is the major presynaptic group II autoreceptor activated by synaptically released glutamate.
- Subjects :
- Pharmacology
Dose-Response Relationship, Drug
Perforant Pathway
Dentate gyrus
Glutamate receptor
Excitatory Postsynaptic Potentials
Neurotransmission
Biology
Receptors, Metabotropic Glutamate
Perforant path
Synaptic Transmission
Mice
Cellular and Molecular Neuroscience
medicine.anatomical_structure
Metabotropic glutamate receptor
Dentate Gyrus
Autoreceptor
medicine
Excitatory postsynaptic potential
Animals
Neuroscience
Subjects
Details
- ISSN :
- 00283908
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Neuropharmacology
- Accession number :
- edsair.doi.dedup.....a7cd85d418cbaa408bd38e527c7d6e6b
- Full Text :
- https://doi.org/10.1016/s0028-3908(02)00084-9