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Similar effects of carbachol and dopamine on neurons in the distal retina of the tiger salamander

Published online by Cambridge University Press:  02 June 2009

William A. Hare  and
W. Geoffrey Owen
William A. Hare
Affiliation:
Division of Neurobiology, Department of Molecular and Cell Biology, University of California, Berkeley
W. Geoffrey Owen
Affiliation:
Division of Neurobiology, Department of Molecular and Cell Biology, University of California, Berkeley
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Abstract

Though there is considerable evidence that dopamine is an important retinal neuromodulator that mediates many of the changes in the properties of retinal neurons that are normally seen during light adaptation, the mechanism by which dopamine release is controlled remains poorly understood. In this paper, we present evidence which indicates that dopamine release in the retina of the tiger salamander, Ambystoma tigrinum, is driven excitatorily by a cholinergic input. We compared the effects of applying carbachol to those of dopamine application on the responses of rods, horizontal cells, and bipolar cells recorded intracellularly from the isolated, perfused retina of the tiger salamander. Micromolar concentrations of dopamine reduced the amplitudes of rod responses throughout the rods' operating range. The ratio of amplitudes of the cone-driven to rod-driven components of the responses of both horizontal and bipolar cells was increased by activation of both D1 and D2 dopamine receptors. Dopamine acted to uncouple horizontal cells and also off-center bipolar cells, the mechanism in the case of horizontal cells depending only upon activation of D1 receptors. Carbachol, a specific cholinomimetic, applied in five- to ten-fold higher concentrations, produced effects that were essentially identical to those of dopamine. These effects of carbachol were blocked by application of specific dopamine blockers, however, indicating that they are mediated secondarily by dopamine. We propose that the dopamine-releasing amacrine cells in the salamander are under the control of cells, probably amacrine cells, which secrete acetylcholine as their transmitter.

Keywords

RetinaSalamanderDopamineCarbachol
Type
Research Articles
Information
Visual Neuroscience , Volume 12 , Issue 3 , May 1995 , pp. 443 - 455
Copyright
Copyright © Cambridge University Press 1995

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