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Whole-cell currents activated at nicotinic acetylcholine receptors on ganglion cells isolated from goldfish retina

Published online by Cambridge University Press:  02 June 2009

Bruce Yazejian  and
Gordon L. Fain
Bruce Yazejian
Affiliation:
Department of Ophthalmology, Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles
Gordon L. Fain
Affiliation:
Department of Physiological Science, Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles
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Abstract

We have recorded whole-cell membrane currents in response to exogenously applied acetylcholine (ACh), nicotine, and 1,1 dimethyl-4-phenyl piperazinium iodide on retinal ganglion cells enzymatically dissociated from goldfish retina. Agonist applications induced nicotinic-type responses in a majority of cells when cells were isolated under optimal conditions. Currents were reminiscent of nicotinic-type ganglionic responses. Dose-response measurements of ACh-induced currents indicated an EC50 of 52 μM and a Hill coefficient of 0.6. Currents were selective for Na+ over Cl− and were highly inwardly rectifying. Responses were blocked reversibly by d-tubocurarine, hexamethonium chloride, and N-methyl-D-glucamine. In 50% of the cases, α-bungarotoxin reversibly blocked the current induced by ACh application. The blocking action of mecamylamine was irreversible and independent of the presence of agonist but was more effective in the presence of ACh. We conclude that functional nicotinic ACh receptors exist on most goldfish retinal ganglion cells.

Keywords

GoldfishRetinaPatch clampNicotinicNMDG
Type
Research Article
Information
Visual Neuroscience , Volume 10 , Issue 2 , March 1993 , pp. 353 - 361
Copyright
Copyright © Cambridge University Press 1993

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