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Synaptic organization of dopaminergic interplexiform cells in the goldfish retina

Published online by Cambridge University Press:  02 June 2009

Stephen Yazulla  and
Charles L. Zucker
Stephen Yazulla
Affiliation:
Department of Neurobiology and Behavior, State University of New York, Stony Brook
Charles L. Zucker
Affiliation:
Department of Neurobiology and Behavior, State University of New York, Stony Brook
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Abstract

The synaptic organization of dopaminergic interplexiform cells (DA-IPC) in the goldfish retina was studied by a combined double-label electron-microscopical (EM) immunocytochemical/autoradiographical study. DA-IPCs were labeled with antisera against tyrosine hydroxylase. The possibility of synaptic contact with GABAergic amacrine cells in the proximal inner plexiform layer (IPL) was studied by using 3H-GABA uptake. Most synaptic input and output from DA-IPC processes involved amacrine cell processes. In addition, synaptic interactions were observed between DA-IPC processes and bipolar cell terminals, other DA-IPC processes, very small dendrites in the IPL, ganglion cell and optic fiber layers (OFL), and cell bodies in the ganglion cell layer (GCL). Input and output synapses with GABAergic amacrine processes also were observed. Two-thirds of the DA-IPC boutons in the proximal IPL were involved in “junctional appositions,” that is, the junctions appeared to be specialized but they were different than classical chemical synapses. The synaptic organization of DA-IPCs in the goldfish IPL appears to be far more complex than previously thought. Although earlier studies have attempted to explain the action of dopamine in terms of interaction only with amacrine cells, the present study shows that effects involving bipolar cells, other DA-IPCs, unidentified processes and cell bodies in the GCL and OFL must be considered as well.

Keywords

GoldfishRetinaDopamineSynapsesImmunocytochemistry
Type
Research Articles
Information
Visual Neuroscience , Volume 1 , Issue 1 , January 1988 , pp. 13 - 29
Copyright
Copyright © Cambridge University Press 1988

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