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pubmed-article:7507468pubmed:abstractTextCultured rat cortical astrocytes, in addition to a variety of voltage-sensitive potassium channels, also express anion channels. However, the behavior and regulation of these anion channels have been far less studied. This paper describes a patch-clamp study on a voltage-sensitive 200-300 pS high-conductance single-channel anion current, which seems to possess at least five different open sublevels or, alternatively, be formed from five or more small-conductance ion channels linked together. This channel is voltage dependent, showing a bell-shaped open probability curve with highest open probability close to the reversal potential (zero-current). Although potassium channels are commonly detected in astrocytes in cell-attached and excised patches with both normal osmolarity and hypoosmotic solutions, the occurrence of the anion channel is clearly increased in isolated patches when hypoosmotic bath solutions are used. Also, cell aging in culture and the preparation of secondary cell cultures by trypsinization seem to increase the rate of occurrence of the anion channel. Though this channel is more routinely seen when a membrane patch is excised from the cell, occasionally cell-attached configurations with instant channel activity can be formed. While the modulation of this anion channel was being studied, it was found to be blocked by an anion transport inhibitor, L-644,711, reported to affect cell volume regulation in astrocytes.lld:pubmed
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pubmed-article:7507468pubmed:articleTitleSingle-channel characteristics of the large-conductance anion channel in rat cortical astrocytes in primary culture.lld:pubmed
pubmed-article:7507468pubmed:affiliationDepartment of Biomedical Sciences, University of Tampere, Finland.lld:pubmed
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