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Volume 17, Number 19,
Issue of October 1, 1997
pp. 7503-7522
Copyright ©1997 Society for Neuroscience
Differential Presynaptic Localization of Metabotropic Glutamate
Receptor Subtypes in the Rat Hippocampus
Received March 28, 1997; revised July 14, 1997; accepted July 16, 1997.
Ryuichi Shigemoto1,
Ayae Kinoshita1,
Eiki Wada1,
Sakashi Nomura3,
Hitoshi Ohishi1,
Masahiko Takada1,
Peter J. Flor4,
Akio Neki2,
Takaaki Abe2,
Shigetada Nakanishi2, and
Noboru Mizuno1
Departments of 1 Morphological Brain Science and
2 Biological Sciences, Faculty of Medicine, and
3 College of Medical Technology, Kyoto University, Kyoto
606, Japan, and 4 Novartis Pharma Inc., Nervous System
Research, CH-4002 Basel, Switzerland
Neurotransmission in the hippocampus is modulated variously through
presynaptic metabotropic glutamate receptors (mGluRs). To establish the
precise localization of presynaptic mGluRs in the rat hippocampus, we
used subtype-specific antibodies for eight mGluRs (mGluR1-mGluR8) for
immunohistochemistry combined with lesioning of the three major
hippocampal pathways: the perforant path, mossy fiber, and Schaffer
collateral. Immunoreactivity for group II (mGluR2) and group III
(mGluR4a, mGluR7a, mGluR7b, and mGluR8) mGluRs was predominantly
localized to presynaptic elements, whereas that for group I mGluRs
(mGluR1 and mGluR5) was localized to postsynaptic elements. The medial
perforant path was strongly immunoreactive for mGluR2 and mGluR7a
throughout the hippocampus, and the lateral perforant path was
prominently immunoreactive for mGluR8 in the dentate gyrus and CA3
area. The mossy fiber was labeled for mGluR2, mGluR7a, and mGluR7b,
whereas the Schaffer collateral was labeled only for mGluR7a. Electron
microscopy further revealed the spatial segregation of group II and
group III mGluRs within presynaptic elements. Immunolabeling for the
group III receptors was predominantly observed in presynaptic active
zones of asymmetrical and symmetrical synapses, whereas that for the group II receptor (mGluR2) was found in preterminal rather than terminal portions of axons. Target cell-specific segregation of receptors, first reported for mGluR7a (), was
also apparent for the other group III mGluRs, suggesting that transmitter release is differentially regulated by
2-amino-4-phosphonobutyrate-sensitive mGluRs in individual synapses on
single axons according to the identity of postsynaptic neurons.
Key words:
metabotropic glutamate receptor;
hippocampus;
perforant
path;
mossy fiber;
Schaffer collateral;
axon terminal;
preterminal;
immunohistochemistry;
lesion
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