ASTROCYTIC GABA RECEPTORS

被引:94
作者
FRASER, DD [1 ]
MUDRICKDONNON, LA [1 ]
MACVICAR, BA [1 ]
机构
[1] UNIV CALGARY, NEUROSCI RES GRP, CALGARY T2N 4N1, AB, CANADA
关键词
CL-; CURRENT; BENZODIAZEPINE; BARBITURATE; SYNAPTIC POTENTIAL; GLIAL FIBRILLARY ACIDIC PROTEIN;
D O I
10.1002/glia.440110203
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
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 GABA(A) 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 GABA(A) 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 GABA(A)-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 GABA(B) receptors on astrocytes. The data that have emerged, however, indicate a prominent role for second-messenger regulation by this receptor. (C) 1994 Wiley-Liss, Inc.
引用
收藏
页码:83 / 93
页数:11
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