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. 1978 Dec;75(12):6310–6313. doi: 10.1073/pnas.75.12.6310

gamma-Aminobutyric acid: a neurotransmitter candidate for cone horizontal cells of the catfish retina.

D M Lam, E M Lasater, K I Naka
PMCID: PMC393171  PMID: 32538

Abstract

In the catfish retina, horizontal cells that receive inputs exclusively from red-sensitive cones are the only neurons that accumulate exogenous gamma-aminobutyric acid under our experimental conditions. When isolated eyecups are perfused with bicuculline methochloride, an antagonist of postsynaptic gamma-aminobutyric acid receptors, responses of cone photoreceptors to a field of light (3 mm in diameter) become much slower and approach those to a small spot of light (0.3 mm). In addition, bicuculline methochloride decreases the frequency responses of cone horizontal cells to a field of light. These findings indicate that, in the catfish retina, feedback synapses from cone horizontal cells to cones are chemically mediated and may use gamma-aminobutyric acid as a neurotransmitter. Our results also confirm the hypothesis that, in the catfish retina, a function of the negative feedback is to improve the frequency responses of the system.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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