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Volume 17, Number 13,
Issue of July 1, 1997
pp. 5196-5205
Copyright ©1997 Society for Neuroscience
Mice Lacking Metabotropic Glutamate Receptor 5 Show Impaired
Learning and Reduced CA1 Long-Term Potentiation (LTP) But Normal CA3
LTP
Received Nov. 11, 1996; revised April 8, 1997; accepted April 11, 1997.
You-Ming Lu1,
Zhengping Jia1,
Christopher Janus1,
Jeffrey T. Henderson1,
Robert Gerlai1,
J. Martin Wojtowicz2, and
John C. Roder1
1 Samuel Lunenfeld Research Institute, Mount Sinai
Hospital, Toronto, Ontario M5G 1X5, Canada, and
2 Department of Physiology, University of Toronto, Toronto,
Ontario M5S 1A8, Canada
Class I metabotropic glutamate receptors (mGluRs) have been
postulated to play a role in synaptic plasticity. To test the involvement of one member of this class, we have recently generated mutant mice that express no mGluR5 but normal levels of other glutamate
receptors. The CNS revealed normal development of gross anatomical
features. To examine synaptic functions we measured evoked field EPSPs
in the hippocampal slice. Measures of presynaptic function, such as
paired pulse facilitation in mutant CA1 neurons, were normal. The
response of mutant CA1 neurons to low concentrations of
(1S,3R) 1-amino-cyclopentane-1,3-dicarboxylic
acid (ACPD) was missing, which suggests that mGluR5 may be the primary
high affinity ACPD receptor in these neurons. Long-term potentiation
(LTP) in mGluR5 mutants was significantly reduced in the NMDA receptor (NMDAR)-dependent pathways such as the CA1 region and dentate gyrus of
the hippocampus, whereas LTP remained intact in the mossy fiber
synapses on the CA3 region, an NMDAR-independent pathway. Some of the
difference in CA1 LTP could lie at the level of expression, because the
reduction of LTP in the mutants was no longer observed 20 min after
tetanus in the presence of 2-amino-5-phosphonopentanoate. We propose
that mGluR5 plays a key regulatory role in NMDAR-dependent LTP. These
mutant mice were also impaired in the acquisition and use of spatial
information in both the Morris water maze and contextual information in
the fear-conditioning test. This is consistent with the hypothesis that
LTP in the CA1 region may underlie spatial learning and memory.
Key words:
hippocampus;
gene targeting;
long-term potentiation;
metabotropic glutamate receptor 5;
spatial learning;
snyaptic
function
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V. W. Wilsch, T. Behnisch, T. Jager, K. G. Reymann, and D. Balschun
When Are Class I Metabotropic Glutamate Receptors Necessary for Long-Term Potentiation?
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[Abstract]
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K. Minami, R. W. Gereau IV, M. Minami, S. F. Heinemann, and R. A. Harris
Effects of Ethanol and Anesthetics on Type 1 and 5 Metabotropic Glutamate Receptors Expressed in Xenopus laevis Oocytes
Mol. Pharmacol.,
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[Abstract]
[Full Text]
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R. Shigemoto, A. Kinoshita, E. Wada, S. Nomura, H. Ohishi, M. Takada, P. J. Flor, A. Neki, T. Abe, S. Nakanishi, et al.
Differential Presynaptic Localization of Metabotropic Glutamate Receptor Subtypes in the Rat Hippocampus
J. Neurosci.,
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[Abstract]
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