Selective postsynaptic co-localization of MCT2 with AMPA receptor GluR2/3 subunits at excitatory synapses exhibiting AMPA receptor trafficking.

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Serval ID
serval:BIB_35679
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Selective postsynaptic co-localization of MCT2 with AMPA receptor GluR2/3 subunits at excitatory synapses exhibiting AMPA receptor trafficking.
Journal
Cerebral Cortex
Author(s)
Bergersen L.H., Magistretti P.J., Pellerin L.
ISSN
1047-3211
Publication state
Published
Issued date
2005
Peer-reviewed
Oui
Volume
15
Number
4
Pages
361-370
Language
english
Abstract
MCT2 is the main neuronal monocarboxylate transporter needed by neurons if they are to use lactate as an additional energy substrate. Previous evidence suggested that some MCT2 could be located in postsynaptic elements of glutamatergic synapses. Using post-embedding electron microscopic immunocytochemistry, it is demonstrated that MCT2 is present at postsynaptic density of asymmetric synapses, in the stratum radiatum of both rat hippocampal CA1 and CA3 regions, as well as at parallel fibre-Purkinje cell synapses in mouse cerebellum. MCT2 levels were significantly lower at mossy fibre synapses on CA3 neurons, and MCT2 was almost absent from symmetric synapses on CA1 pyramidal cells. It could also be demonstrated using quantitative double-labeling immunogold cytochemistry that MCT2 and AMPA receptor GluR2/3 subunits have a similar postsynaptic distribution at asymmetric synapses with high levels expressed within the postsynaptic density. In addition, as for AMPA receptors, a significant proportion of MCT2 is located on vesicular membranes within the postsynaptic spine, forming an intracellular pool available for a putative postsynaptic endo/exocytotic trafficking at these excitatory synapses. Altogether, the data presented provide evidence for MCT2 expression in the postsynaptic density area at specific subsets of glutamatergic synapses, and also suggest that MCT2, like AMPA receptors, could undergo membrane trafficking.
Keywords
Amino Acid Sequence, Animals, Brain/anatomy &amp, histology, Brain Chemistry/genetics, Dendrites/metabolism, Dendrites/ultrastructure, Excitatory Postsynaptic Potentials/physiology, Glutamates/physiology, Immunohistochemistry, Male, Mice, Microscopy, Electron, Molecular Sequence Data, Monocarboxylic Acid Transporters/metabolism, Nerve Fibers/metabolism, Nerve Fibers/ultrastructure, Neuronal Plasticity/physiology, Purkinje Cells/metabolism, Purkinje Cells/ultrastructure, Rats, Rats, Wistar, Receptors, AMPA/metabolism, Receptors, AMPA/physiology, Synapses/physiology
Pubmed
Web of science
Open Access
Yes
Create date
19/11/2007 13:34
Last modification date
25/09/2019 7:08
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