Astrocytic GABA receptors.

Abstract:

:GABA receptors are distributed widely throughout the central nervous system on a variety of cell types. It has become increasingly clear that astrocytes, both in cell culture and tissue slices, express abundant GABAA receptors. In astrocytes, GABA activates Cl(-)-specific channels that are modulated by barbiturates and benzodiazepines; however, the neuronal inverse agonist methyl-4-ethyl-6, 7-dimethoxy-beta-carboline-3-carboxylate enhances the current in a subpopulation of astrocytes. The properties of astrocytic GABAA receptors, therefore, are remarkably similar to their neuronal counterparts, with only a few pharmacological exceptions. In stellate glial cells of the pituitary pars intermedia, GABA released from neuronal terminals activates postsynaptic potentials directly. The physiological significance of astrocytic GABAA-receptor activation remains unknown, but it may be involved in extracellular ion homeostasis and pH regulation. At present, there is considerably less evidence for the presence of GABAB receptors on astrocytes. The data that have emerged, however, indicate a prominent role for second-messenger regulation by this receptor.

journal_name

Glia

journal_title

Glia

authors

Fraser DD,Mudrick-Donnon LA,MacVicar BA

doi

10.1002/glia.440110203

subject

Has Abstract

pub_date

1994-06-01 00:00:00

pages

83-93

issue

2

eissn

0894-1491

issn

1098-1136

journal_volume

11

pub_type

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