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The Journal of Neuroscience, December 1, 1998, 18(23):10136-10149
Immunocytochemical Localization of the Postsynaptic Density
Protein PSD-95 in the Mammalian Retina
Peter
Koulen1,
Erica L.
Fletcher1,
Sarah E.
Craven2,
David S.
Bredt2, and
Heinz
Wässle1
1 Max-Planck-Institut für Hirnforschung, D-60528
Frankfurt, Germany, and 2 Department of Physiology,
University of California at San Francisco, San Francisco, California
94143
Synapse-associated proteins are the scaffold for the selective
aggregation of ion channels at synapses; they provide the link to
cytoskeletal elements and possibly are involved with the
regulation of synaptic efficacy by electrical activity. The
localization of the postsynaptic density protein PSD-95 was studied in
different mammalian retinae (rat, monkey, and tree shrew) by using
immunocytochemical methods. Immunofluorescence for PSD-95 was most
prominent in the outer plexiform layer (OPL). The axon terminals of
rods and cones, the rod spherules and cone pedicles, were strongly
labeled. Electron microscopy, using preembedding immunocytochemistry,
showed PSD-95 localized presynaptically within the photoreceptor
terminals. Distinct PSD-95 labeling was also present in the inner
plexiform layer (IPL). It had a punctate appearance suggesting the
synaptic clustering of PSD-95 in the IPL. Electron microscopy showed
that PSD-95 was concentrated in processes that were postsynaptic at bipolar cell ribbon synapses (dyads). As a rule, only one of the two
postsynaptic members of the dyad was labeled for PSD-95.
Double-labeling experiments were performed for PSD-95 and for SAP 102 or PSD-93, respectively, two other members of the family of
synapse-associated proteins. All three were found to be colocalized in
the synaptic hot spots in the IPL. In the OPL, however, PSD-95 and
PSD-93 were found presynaptically, whereas SAP 102 was located
postsynaptically at photoreceptor synapses. Double-labeling experiments
also were performed for PSD-95 and for the NR1 subunit of the
NMDA receptor. They were found to be colocalized in synaptic hot
spots in the IPL.
Key words:
PSD-95; SAP 102; PSD-93; NMDA receptors; NR1 subunit; postsynaptic density; receptor clustering; cone pedicle; rod
spherule
Copyright © 1998 Society for Neuroscience 0270-6474/98/182310136-14$05.00/0
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