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A comparison of receptive field and tracer coupling size of horizontal cells in the rabbit retina

Published online by Cambridge University Press:  02 June 2009

Stewart A. Bloomfield ,
Daiyan Xin  and
Seth E. Persky
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
Seth E. Persky
Affiliation:
Department of Ophthalmology, New York University Medical Center, New York
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Abstract

The large receptive fields of retinal horizontal cells are thought to reflect extensive electrical coupling via gap junctions. It was shown recently that the biotinylated tracers, biocytin and Neurobiotin, provide remarkable images of coupling between many types of retinal neuron, including horizontal cells. Further, these demonstrations of tracer coupling between horizontal cells rivaled the size of their receptive fields, suggesting that the pattern of tracer coupling may provide some index of the extent of electrical coupling. We studied this question by comparing the receptive field and tracer coupling size of dark-adapted horizontal cells recorded in the superfused, isolated retina-eyecup of the rabbit. Both the edge-to-edge receptive field and space constants (λ) were computed for each cell using a long, narrow slit of light displaced across the retinal surface. Cells were subsequently labeled by iontophoretic injection of Neurobiotin. The axonless A-type horizontal cells showed extensive, homologous tracer coupling in groups greater than 1000 covering distances averaging about 2 mm. The axon-bearing B-type horizontal cells were less extensively tracer coupled, showing homologous coupling of the somatic endings in groups of about 100 cells spanning approximately 400 μm and a separate homologous coupling of the axon terminal endings covering only about 275 μm. Moreover, we observed a remarkable, linear relationship between the size of the receptive fields of each of the three horizontal cell endings and the magnitude of their tracer coupling. Our findings suggest that the extent of tracer coupling provides a strong, linear index of the magnitude of electrical current flow, as derived from receptive-field measures, across groups of coupled horizontal cells. These data thus provide the first direct evidence that the receptive-field size of horizontal cells is related to the extent of their coupling via gap junctions.

Keywords

Receptive fieldsElectrical couplingBiotinylated tracersGap junctionsHorizontal cellsRetina
Type
Research Articles
Information
Visual Neuroscience , Volume 12 , Issue 5 , September 1995 , pp. 985 - 999
Copyright
Copyright © Cambridge University Press 1995

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