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Volume 17, Number 5,
Issue of March 1, 1997
pp. 1691-1700
Copyright ©1997 Society for Neuroscience
Dendritic and Postsynaptic Localizations of Glycine Receptor Subunit mRNAs
Received Oct. 1, 1996; revised Dec. 16, 1996; accepted Dec. 18, 1996.
Claudia Racca,
Alejandra Gardiol, and
Antoine Triller
Laboratoire de Biologie Cellulaire de la Synapse, INSERM, CJF
94-10, Ecole Normale Supérieure, 75005 Paris, France
Some synaptic neurotransmitter receptors, such as those for
glycine, have somato-dendritic distributions. Although the machinery for protein synthesis and several mRNAs are present in dendrites and
close to synapses in central neurons, so far the mRNAs for neurotransmitter receptors have not been found unequivocally in dendrites. The glycine receptor (GlyR), a ligand-gated channel mediating a chloride-dependent inhibition, is composed of transmembrane and subunits. GlyRs are only present at glycinergic
postsynaptic differentiation, where they are stabilized by the
associated protein gephyrin. With light nonradioactive in
situ hybridization (ISH), we observe that GlyR subunit
mRNAs are present in both somata and dendrites of most neurons of the
ventral horn of rat spinal cord, whereas the subunit and gephyrin
mRNAs are predominantly in somata. Interestingly, within dendrites GlyR
subunit mRNAs form aggregates that are mostly localized
peripherally to the dendritic axial core. Electron microscopic ISH
shows that GlyR subunit mRNAs are associated with postsynaptic
differentiations. At these sites, the GlyR subunit mRNAs are
detected in close association with subsynaptic cisternae. This
targeting of subunit mRNAs to postsynaptic domains could provide a
means of dynamically modulating synaptic efficacy by changing the
composition and the density of receptors at glycinergic synapses.
Key words:
glycine receptor;
dendritic mRNA;
spinal cord;
in
situ hybridization;
immunocytochemistry;
confocal microscopy;
electron microscopy
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