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Induction of LTP in the hippocampus needs synaptic activation of glutamate metabotropic receptors

Induction of LTP in the hippocampus needs synaptic activation of glutamate metabotropic receptors UNDERSTANDING the mechanisms of long-term potentiation (LTP) should provide insights into the molecular basis of learning and memory in vertebrates. lonotropic glutamate receptors play a central role in LTP; AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionate) receptors and NMDA (N-methyl-D-aspar-tate) receptors mediate synaptic responses that are enhanced in LTP and, in addition, NMDA receptors are necessary for the induction of LTP in most pathways1. There is also circumstantial evidence that metabotropic glutamate receptors (mGluRs) may be involved in LTP because the specific mGluR agonist aminocyc-lopentane dicarboxylate can augment tetanus-induced LTP2 and, under certain circumstances, can itself induce a slow-onset potentiation3,4. But the absence of any effective mGluR antagonist has prevented the determination of whether mGluRs are involved in the induction of tetanus-induced LTP. We report here that (RS)-α-methyl-4-carboxyphenylglycine is a specific mGluR antagonist in the hippocampus and have used this compound to examine the nature of the involvement of mGluRs in LTP. We show that synaptic activation of mGluRs is necessary for the induction of both NMDA receptor-dependent and NMDA receptor-independent forms of LTP in the hippocampus. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Springer Journals

Induction of LTP in the hippocampus needs synaptic activation of glutamate metabotropic receptors

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References (34)

Publisher
Springer Journals
Copyright
Copyright © 1993 by Nature Publishing Group
Subject
Science, Humanities and Social Sciences, multidisciplinary; Science, Humanities and Social Sciences, multidisciplinary; Science, multidisciplinary
ISSN
0028-0836
eISSN
1476-4687
DOI
10.1038/363347a0
Publisher site
See Article on Publisher Site

Abstract

UNDERSTANDING the mechanisms of long-term potentiation (LTP) should provide insights into the molecular basis of learning and memory in vertebrates. lonotropic glutamate receptors play a central role in LTP; AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionate) receptors and NMDA (N-methyl-D-aspar-tate) receptors mediate synaptic responses that are enhanced in LTP and, in addition, NMDA receptors are necessary for the induction of LTP in most pathways1. There is also circumstantial evidence that metabotropic glutamate receptors (mGluRs) may be involved in LTP because the specific mGluR agonist aminocyc-lopentane dicarboxylate can augment tetanus-induced LTP2 and, under certain circumstances, can itself induce a slow-onset potentiation3,4. But the absence of any effective mGluR antagonist has prevented the determination of whether mGluRs are involved in the induction of tetanus-induced LTP. We report here that (RS)-α-methyl-4-carboxyphenylglycine is a specific mGluR antagonist in the hippocampus and have used this compound to examine the nature of the involvement of mGluRs in LTP. We show that synaptic activation of mGluRs is necessary for the induction of both NMDA receptor-dependent and NMDA receptor-independent forms of LTP in the hippocampus.

Journal

Nature – Springer Journals

Published: May 27, 1993

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