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Transmitter-gated currents of GABAergic amacrine-like cells in chick retinal cultures

Published online by Cambridge University Press:  02 June 2009

Reiner huba  and
Hans-Dieter Hofmann
Reiner huba
Affiliation:
Max-Planck-Institut für Hirnforschung, Deutschordenstrasse 46, W-6000 Frankfurt/M., Germany
Hans-Dieter Hofmann
Affiliation:
Max-Planck-Institut für Hirnforschung, Deutschordenstrasse 46, W-6000 Frankfurt/M., Germany
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Abstract

A subpopulation of cells developing in dissociated neuronal cultures prepared from 8-day-old embryonic chick retinae can be identified as putative in vitro counterparts of GABAergic amacrine cells by immunocytochemical and autoradiographic markers and by their electrophysiological responses to transmitter agonists. In the present study, transmitter-gated conductances expressed by these neurons were examined using the whole-cell patch-clamp technique. At negative holding potentials, the excitatory amino acid agonists N-methyl-D-aspartate (NMDA), kainate quisqualate, and glutamate induced inward currents with reversal potentials close to 0 mV in most of the cells selected for recording. NMDA-evoked responses were selectively blocked by the noncompetitive inhibitor MK 801 and by Mg2+ (in a voltage-dependent manner) and were potentiated in the presence of submicromolar concentrations of glycine. Glutamate apparently interacted with both NMDA and non-NMDA type receptors. All cells tested responded to the inhibitory transmitters GABA and glycine. Both inhibitory agonists could be shown to activate chloride conductances. Responses to GABA and glycine were specifically inhibited in the presence of bicuculline and strychnine, respectively. Thus, GABAergic neurons in retinal cultures express at least two different excitatory amino acid receptors–NMDA and non-NMDA–and two different inhibitory amino acid receptors–the GABAA and the glycine receptor. The results demonstrate the ability of the cultured neurons to develop an apparently mature phenotype and contribute to the understanding of the functional properties of GABAergic amacrine cells in the vertebrate retina.

Keywords

Chick retinaPatch-clamp recordingExcitatory amino acidsGamma-aminobutyric acidGlycine
Type
Research Articles
Information
Visual Neuroscience , Volume 6 , Issue 4 , April 1991 , pp. 303 - 314
Copyright
Copyright © Cambridge University Press 1991

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