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  Patch-clamp study of gamma-aminobutyric acid receptor Cl- channels in cultured astrocytes.

Bormann, J., & Kettenmann, H. (1988). Patch-clamp study of gamma-aminobutyric acid receptor Cl- channels in cultured astrocytes. Proceedings of the National Academy of Sciences of the United States of America, 85(23), 9336-9340.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-2EA7-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-2EA9-8
Genre: Journal Article

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Bormann, J.1, Author              
Kettenmann, H., Author
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1Abteilung Zellphysiologie, MPI for biophysical chemistry, Max Planck Society, ou_578558              

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 Abstract: The membrane channels operated by gamma-aminobutyric acid (GABA) were studied in cultured astrocytes from rat cerebral hemispheres by using patch-clamp techniques. The channel properties appeared to be very similar, in many respects, to those present in neuronal cell membranes. The Cl- -selective channels were activated after the sequential binding of two GABA molecules to the receptor, as deduced from the slope of the dose-response curve. Single-channel currents displayed multiple conductance states of 12 pS, 21 pS, 29 pS, and 43 pS, with the main-state conductance being 29 pS. The gating properties could be described by a sequential reaction scheme for agonist-activated channels. GABA-induced whole-cell currents were potentiated by the benzodiazepine receptor agonist diazepam and also, to a lesser extent, by methyl 6,7-dimethoxy-4-ethyl-beta-carboline-3-carboxylate an inverse agonist. In neurons and chromaffin cells, methyl 6,7-dimethoxy-4-ethyl-beta-carboline-3-carboxylate reduces the sensitivity of the GABA receptor, indicating that neuronal and glial GABA/benzodiazepine receptor--Cl- channel complexes are different. Glial GABA receptor channels could be of functional importance in buffering extracellular Cl- in the cleft of the GABAergic synapse.

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Language(s): eng - English
 Dates: 1988-12
 Publication Status: Published in print
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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Pages: - Volume / Issue: 85 (23) Sequence Number: - Start / End Page: 9336 - 9340 Identifier: -