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A comparison of receptive-field and tracer-coupling size of amacrine and ganglion cells in the rabbit retina

Published online by Cambridge University Press:  02 June 2009

Stewart A. Bloomfield  and
Daiyan Xin
Stewart A. Bloomfield
Affiliation:
Department of Ophthalmology, New York University Medical Center, New York Department of Physiology and Neuroscience, New York University Medical Center, New York
Daiyan Xin
Affiliation:
Department of Ophthalmology, New York University Medical Center, New York
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Abstract

Recent studies have shown that amacrine and ganglion cells in the mammalian retina are extensively coupled as revealed by the intercellular movement of the biotinylated tracers biocytin and Neurobiotin. These demonstrations of tracer coupling suggest that electrical networks formed by proximal neurons (i.e. amacrine and ganglion cells) may underlie the lateral propagation of signals across the inner retina. We studied this question by comparing the receptive-field size, dendritic-field size, and extent of tracer coupling of amacrine and ganglion cells in the dark-adapted, supervised, isolated retina eyecup of the rabbit. Our results indicate that while the center-receptive fields of proximal neurons are approximately 15% larger than their corresponding dendritic diameters, this slight difference can be explained by factors other than electrical coupling such as tissue shrinkage associated with histological processing. However, the extent of tracer coupling of amacrine and ganglion cells was, on average, about twice the size of the corresponding receptive fields. Thus, the receptive field of an individual proximal neuron matched far more closely to its dendritic diameter than to the size of the tracer-coupled network of cells to which it belonged. The exception to this rule was the AII amacrine cells for which center-receptive fields were 2–3 times the size of their dendritic diameters but matched closely to the size of the tracer-coupled arrays. Thus, with the exception of AII cells, our data indicate that tracer coupling between proximal neurons is not associated with an enlargement of their receptive fields. Our results, then, provide no evidence for electrical coupling or, at least, indicate that extensive lateral spread of visual signals does not occur in the proximal mammalian retina.

Keywords

Amacrine cellsGanglion cellsGap junctionsElectrical couplingBiotinylated tracers
Type
Research Articles
Information
Visual Neuroscience , Volume 14 , Issue 6 , November 1997 , pp. 1153 - 1165
Copyright
Copyright © Cambridge University Press 1997

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