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Characteristics of GABAA channels in rat dentate gyrus.
John Curtin School of Medical Research, Australian National University.
1994 (English)In: Journal of Membrane Biology, ISSN 0022-2631, E-ISSN 1432-1424, Vol. 142, no 1, 93-102 p.Article in journal (Refereed) Published
Abstract [en]

Single channel currents were activated by GABA (0.5 to 5 microM) in cell-attached and inside-out patches from cells in the dentate gyrus of rat hippocampal slices. The currents reversed at the chloride equilibrium potential and were blocked by bicuculline (100 microM). Several different kinds of channel were seen: high conductance and low conductance, rectifying and "nonrectifying." Channels had multiple conductance states. The open probability (Po) of channels was greater at depolarized than at hyperpolarized potentials and the relationship between Po and potential could be fitted with a Boltzmann equation with equivalent valency (z) of 1. The combination of outward rectification and potential-dependent open probability gave very little chloride current at hyperpolarized potentials but steeply increasing current with depolarization, useful properties for a tonic inhibitory mechanism.

Place, publisher, year, edition, pages
1994. Vol. 142, no 1, 93-102 p.
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Physiology
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URN: urn:nbn:se:uu:diva-182797PubMedID: 7707357OAI: oai:DiVA.org:uu-182797DiVA: diva2:560727
Available from: 2012-10-15 Created: 2012-10-15 Last updated: 2017-12-07

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