The diversity of GABAA receptors -: Pharmacological and electrophysiological properties of GABAA channel subtypes

被引:378
|
作者
Hevers, W [1 ]
Lüddens, H [1 ]
机构
[1] Johannes Gutenberg Univ Mainz, Dept Psychiat, Wulf Hevers & Hartmut Luddens Clin Res Grp, D-55131 Mainz, Germany
关键词
GABA(A); benzodiazepines; electrophysiology; recombinant receptors;
D O I
10.1007/BF02741459
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The amino acid gamma-aminobutyric-acid (GABA) prevails in the CNS as an inhibitory neurotransmitter that mediates most of its effects through fast GABA-gated Cl--channels (GABA(A)R). Molecular biology uncovered the complex subunit architecture of this receptor channel, in which a pentameric assembly derived from five of at least 17 mammalian subunits, grouped in the six classes alpha, beta, gamma, delta, epsilon, and rho, permits a vast number of putative receptor isoforms. The subunit com position of a particular receptor determines the specific effects of allosterical modulators of the GABA(A)Rs like benzodiazepines (BZs), barbiturates, steroids, some convulsants, polyvalent cations, and ethanol. To understand the physiology and diversity of GABA(A)Rs, the native isoforms have to be identified by their localization in the brain and by their pharmacology. In heterologous expression systems, channels require the presence of alpha, beta, and gamma subunits in order to mimic the full repertoire of native receptor responses to drugs, with the BZ pharmacology being determined by the particular alpha and gamma subunit variants. Little is known about the functional properties of the beta, delta, and epsilon subunit classes and only a few receptor subtype-specific substances like loreclezole and furosemide are known that enable the identification of defined receptor subtypes. We will summarize the pharmacology of putative receptor isoforms and emphasize the characteristics of functional channels. Knowledge of the complex pharmacology of GABA(A)Rs might eventually enable site-directed drug design to further our understanding of GABA-related disorders and of the complex interaction of excitatory and inhibitory mechanisms in neuronal processing.
引用
收藏
页码:35 / 86
页数:52
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