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Glycinergic synapses in the rod pathway of the rat retina: cone bipolar cells express the alpha 1 subunit of the glycine receptor

M Sassoe-Pognetto, H Wassle and U Grunert
Journal of Neuroscience 1 August 1994, 14 (8) 5131-5146; DOI: https://doi.org/10.1523/JNEUROSCI.14-08-05131.1994
M Sassoe-Pognetto
Max-Planck-Institut fur Hirnforschung, Neuroanatomische Abteilung, Frankfurt am Main, Germany.
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H Wassle
Max-Planck-Institut fur Hirnforschung, Neuroanatomische Abteilung, Frankfurt am Main, Germany.
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U Grunert
Max-Planck-Institut fur Hirnforschung, Neuroanatomische Abteilung, Frankfurt am Main, Germany.
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Abstract

Glycine receptors (GlyRs) and their role in retinal circuitry were analyzed immunocytochemically in the rat retina. Specific antibodies against the alpha 1 subunit of the GlyR and against the GlyR-associated protein gephyrin, respectively, were used. In the inner plexiform layer (IPL), both antibodies produced a punctate label that was shown by electron microscopy to occur at synapses. Gephyrin-like immunoreactivity (-LI) was more widely distributed, indicating that gephyrin might also occur at nonglycinergic synapses. At the ultrastructural level, gephyrin-LI was found at the cytoplasmic face of postsynaptic membranes of amacrine and ganglion cells, but was never detected in bipolar cell axons. Immunoreactivity for the alpha 1 subunit was concentrated in the cleft of conventional synapses made by amacrine cell processes onto ganglion cell dendrites and cone bipolar axons. The latter synapses differ from other glycinergic synapses since they are not labeled by the antibody against gephyrin used in this study. In order to identify the type of bipolar cell involved in these synapses, the distribution of the alpha 1 subunit was compared with that of recoverin-immunoreactive cone bipolar cells and with that of parvalbumin-immunoreactive All-amacrine cells. Double-label immunofluorescence showed that, in the outer part of the IPL, 75% of the alpha 1-immunoreactive puncta were colocalized with recoverin- positive bipolar cell axons and 71% of the alpha 1-immunoreactive puncta were colocalized with parvalbumin-positive All-amacrine processes. Hence, the alpha 1 subunit of the GlyR is present at the chemical synapses established by All-amacrine cells with OFF-cone bipolar cells and OFF-ganglion cells. These synapses play a key role in the transmission of scotopic signals through the OFF-channel of the rod pathway.

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The Journal of Neuroscience: 14 (8)
Journal of Neuroscience
Vol. 14, Issue 8
1 Aug 1994
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Glycinergic synapses in the rod pathway of the rat retina: cone bipolar cells express the alpha 1 subunit of the glycine receptor
M Sassoe-Pognetto, H Wassle, U Grunert
Journal of Neuroscience 1 August 1994, 14 (8) 5131-5146; DOI: 10.1523/JNEUROSCI.14-08-05131.1994

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Glycinergic synapses in the rod pathway of the rat retina: cone bipolar cells express the alpha 1 subunit of the glycine receptor
M Sassoe-Pognetto, H Wassle, U Grunert
Journal of Neuroscience 1 August 1994, 14 (8) 5131-5146; DOI: 10.1523/JNEUROSCI.14-08-05131.1994
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