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Immunolocalization of metabotropic glutamate receptors 1 and 5 in the synaptic layers of the chicken retina

Published online by Cambridge University Press:  24 April 2006

MADHUMITA SEN  and
EVANNA GLEASON
MADHUMITA SEN
Affiliation:
Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana
EVANNA GLEASON
Affiliation:
Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana
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Abstract

We have examined the distribution of metabotropic glutamate receptors (mGluRs) 1 and 5 in the adult chicken retina using preembedding immuno-electronmicroscopy. Immunoreactivity for mGluRs 1 and 5 was found in both the outer plexiform layer (OPL) and the inner plexiform layer (IPL). For mGluR1, OPL labeling was observed at cone pedicles and horizontal and bipolar cell processes. In the IPL, mGluR1 labeling could be found on bipolar cell terminals, as well as postsynaptic processes, including amacrine cell processes. Neither presynaptic nor postsynaptic elements were labeled at rod synapses. For mGluR5, OPL labeling was associated with cone pedicles as well as bipolar and horizontal cell processes. As for mGluR1, rod synapses were unlabeled. In the IPL, labeling for mGluR5 was found on bipolar cell terminals and amacrine cell processes. The presynaptic expression of these receptors in the OPL was confirmed at the light level by double-labeling experiments with SV2. The distributions of mGluRs 1 and 5 indicate that they have the potential to regulate function in both synaptic layers. Furthermore, the similar expression patterns for these two receptors indicate that they might be co-expressed and thus have the potential to interact functionally.

Keywords

Amacrine cellsCone photoreceptorElectron microscopyGlutamate receptors
Type
Research Article
Information
Visual Neuroscience , Volume 23 , Issue 2 , March 2006 , pp. 221 - 231
Copyright
2006 Cambridge University Press

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