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gamma-Aminobutyric acid receptors on chick ciliary ganglion neurons in vivo and in cell culture

AE McEachern, JF Margiotta and DK Berg
Journal of Neuroscience 1 October 1985, 5 (10) 2690-2695; DOI: https://doi.org/10.1523/JNEUROSCI.05-10-02690.1985
AE McEachern
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JF Margiotta
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DK Berg
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Abstract

In the chick ciliary ganglion, preganglionic terminals maintain cholinergic synapses on the choroid neurons and both cholinergic and electrical synapses on the ciliary neurons. The preganglionic terminals also contain enkephalin- and substance P-like immunoreactivity, suggesting that transmission through the ganglion is more complicated than is indicated by the known synaptic connections. We report here that embryonic chick ciliary ganglion neurons also have gamma- aminobutyric acid (GABA) receptors and that GABA applied to the ganglion can block transmission elicited by preganglionic stimulation. Studies on the neurons in cell culture indicate that the GABA response is mediated by GABAA receptors: GABA activates a Cl- conductance, and the response can be mimicked by muscimol and blocked by bicuculline or picrotoxin. The GABA receptors are regulated independently from acetylcholine (ACh) receptors on the neurons since the levels of ACh and GABA sensitivity are influenced differently by culture age and by chronic exposure to GABA or elevated K+ concentrations. Application of GABA to intact ciliary ganglia increases the membrane conductance of ganglionic neurons (as in culture), reduces to subthreshold the amplitude of excitatory postsynaptic potentials in the neurons elicited by preganglionic stimulation and completely blocks transmission through the ganglion. A native source of ligand for the receptors in vivo has yet to be identified.

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The Journal of Neuroscience: 5 (10)
Journal of Neuroscience
Vol. 5, Issue 10
1 Oct 1985
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gamma-Aminobutyric acid receptors on chick ciliary ganglion neurons in vivo and in cell culture
AE McEachern, JF Margiotta, DK Berg
Journal of Neuroscience 1 October 1985, 5 (10) 2690-2695; DOI: 10.1523/JNEUROSCI.05-10-02690.1985

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gamma-Aminobutyric acid receptors on chick ciliary ganglion neurons in vivo and in cell culture
AE McEachern, JF Margiotta, DK Berg
Journal of Neuroscience 1 October 1985, 5 (10) 2690-2695; DOI: 10.1523/JNEUROSCI.05-10-02690.1985
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