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Journal of Neural Transmission

Erschienen in:

01.04.2010 | Basic Neurosciences, Genetics and Immunology - Original Article

GABAa and GABAc receptor-mediated modulation of responses to color stimuli: electroretinographic study in the turtle Emys orbicularis

verfasst von: Petia Kupenova, Lily Vitanova, Elka Popova

Erschienen in: Journal of Neural Transmission | Ausgabe 4/2010

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Abstract

GABAergic transmission is involved in color coding in the retina. The specific contribution of different GABA receptors to spectral sensitivity of the retinal responses is not well characterized. We studied GABAa and GABAc receptor-mediated effects on the intensity-response functions of the electroretinographic ON (b-wave) and OFF (d-wave) responses to color stimuli. For this purpose, we compared the effects of GABAa receptor blockade by bicuculline with the effects of GABAa + GABAc receptor blockade by picrotoxin. The blockade of both GABAa and GABAc receptors caused an amplitude increase of the electroretinographic responses, but the effects of the two blockades depended in a specific manner on stimulus intensity and wavelength. The effects of GABAa receptor blockade showed distinct color ON/OFF asymmetry. The absolute and relative sensitivities of the ON responses to blue stimuli and OFF responses to red stimuli were increased to the greatest degree while the sensitivity of the ON responses to red stimuli and OFF responses to blue stimuli was least increased. In contrast, color ON/OFF asymmetry was not typical of the effects of GABAc receptor blockade. The most prominent GABAc effect was the sensitivity increase of the ON and OFF responses to blue stimuli and, to some lesser extent, to green stimuli. The results of this study indicate a specific role of GABAa and GABAc receptor-mediated influences in processing of chromatic information in the distal retina.

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Titel: GABAa and GABAc receptor-mediated modulation of responses to color stimuli: electroretinographic study in the turtle Emys orbicularis
verfasst von: Petia Kupenova
Lily Vitanova
Elka Popova
Publikationsdatum: 01.04.2010
Verlag: Springer Vienna
Erschienen in: Journal of Neural Transmission / Ausgabe 4/2010
Print ISSN: 0300-9564
Elektronische ISSN: 1435-1463
DOI: https://doi.org/10.1007/s00702-010-0381-z

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