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Synaptic microcircuitry of bipolar and amacrine cells with serotonin-like immunoreactivity in the retina of the turtle, Pseudemys scripta elegans

Published online by Cambridge University Press:  02 June 2009

Lawrence B. Hurd II  and
William D. Eldred
Lawrence B. Hurd II
Affiliation:
Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston
William D. Eldred
Affiliation:
Department of Biology, Boston University, Boston
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Abstract

Although serotonin is thought to be a neurotransmitter in a number of retinal systems, much of the precise synaptic connectivity of serotonergic neurons is unknown. To address this issue, we used an antiserum directed against serotonin to label serotonergic bipolar and amacrine cells in the turtle retina. Light-microscopic analysis of labeled amacrine and bipolar cells indicated that both had bistratified dendritic arborizations primarily in stratum 1 and in strata 4/5 of the inner plexiform layer.

Ultrastructural analysis of the neurocircuitry of these cells indicated that the processes of labeled bipolar cells in the outer plexiform layer made basal junction contacts with photoreceptor terminals. Only in rare instances did labeled bipolar cells processes invaginate near photoreceptor ribbon synapses. Processes of labeled bipolar cells received both conventional and small ribbon synaptic contacts in the outer plexiform layer. Bipolar cell processes in stratum 1 of the inner plexiform layer synapsed onto either amacrine/amacrine or amacrine/ganglion cell dyads, and made rare ribbon synaptic contacts onto labeled amacrine cell processes. Synaptic inputs to serotonergic bipolar cells in stratum 1 were from unlabeled bipolar and amacrine cells. Bipolar cell contacts in strata 4/5 were similar to those in stratum 1, but were fewer in number and no bipolar cell inputs were seen.

Labeled amacrine cell output in both strata was onto other unlabeled amacrine cells and ganglion cells; but synaptic outputs to unlabeled bipolar cells were only seen in strata 4/5. In both strata 1 and 4/5, synaptic inputs to labeled amacrine cells were from both unlabeled amacrine cells and labeled bipolar cells. The serotonergic amacrine cells had many more synaptic interactions in stratum 1 than in strata 4/5 which supports the role of serotonergic bipolar cells in the OFF pathway of retinal processing. Interactions between serotonergic bipolar and amacrine cells may play an important role in visual processing.

Keywords

IndoleaminesVertebrate retina5-HydroxytryptamineNeurocircuitry
Type
Articles
Information
Visual Neuroscience , Volume 10 , Issue 3 , May 1993 , pp. 455 - 471
Copyright
Copyright © Cambridge University Press 1993

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