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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kettenmann, H. Bormann, J. |
| Description | Author Affiliation: Bormann J ( Max-Planck-Institut für biophysikalische Chemie, Göttingen, Federal Republic of Germany.); |
| 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. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 85 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1988-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Astrocytes Cytology Chlorides Metabolism Ion Channels Physiology Receptors, GABA-A Animals Animals, Newborn Brain Cells, Cultured Electric Conductivity Membrane Potentials Drug Effects Rats, Inbred Strains Gamma-Aminobutyric Acid Pharmacology Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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