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Tracer coupling between fish rod horizontal cells: Modulation by light and dopamine but not the retinal circadian clock

Published online by Cambridge University Press:  20 July 2007

CHRISTOPHE RIBELAYGA  and
STUART C. MANGEL
CHRISTOPHE RIBELAYGA
Affiliation:
Department of Neuroscience, The Ohio State University College of Medicine, Columbus, Ohio
STUART C. MANGEL
Affiliation:
Department of Neuroscience, The Ohio State University College of Medicine, Columbus, Ohio
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Abstract

Horizontal cells are second order neurons that receive direct synaptic input from photoreceptors. In teleosts horizontal cells can be divided into two categories, cone-connected and rod-connected. Although the anatomy and physiology of fish cone horizontal cells have been extensively investigated, less is known about rod horizontal cells. This study was undertaken to determine whether light and/or the circadian clock regulate gap junctional coupling between goldfish rod horizontal cells. We used fine-tipped, microelectrode intracellular recording to monitor rod horizontal cells under various visual stimulation conditions, and tracer (biocytin) iontophoresis to visualize their morphology and evaluate the extent of coupling. Under dark-adapted conditions, rod horizontal cells were extensively coupled to cells of like-type (homologous coupling) with an average of ∼120 cells coupled. Under these conditions, no differences were observed between day, night, the subjective day, and subjective night. In addition, under dark-adapted conditions, application of the dopamine D2-like agonist quinpirole (1 μM), the D2-like antagonist spiperone (10 μM), or the D1-like antagonist SCH23390 (10 μM) had no effect on rod horizontal cell tracer coupling. In contrast, the extent of tracer coupling was reduced by ∼90% following repetitive light (photopic range) stimulation of the retina or application of the D1-agonist SKF38393 (10 μM) during the subjective day and night. We conclude that similarly to cone horizontal cells, rod horizontal cells are extensively coupled to one another in darkness and that the extent of coupling is dramatically reduced by bright light stimulation or dopamine D1-receptor activation. However, in contrast to cone horizontal cells whose light responses are under the control of the retinal clock, the light responses of rod horizontal cells under dark-adapted conditions were similar during the day, night, subjective day, and subjective night thus demonstrating that they are not under the influence of the circadian clock.

Keywords

Gap junctionsHorizontal cellsDopamine receptorsCircadian rhythmRod pathway
Type
Research Article
Information
Visual Neuroscience , Volume 24 , Issue 3 , May 2007 , pp. 333 - 344
Copyright
© 2007 Cambridge University Press

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