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Journal Article

High Potassium Conductance in Astrocyte Endfeet

Eric A. Newman
Science
New Series, Vol. 233, No. 4762 (Jul. 25, 1986), pp. 453-454
Stable URL: http://www.jstor.org/stable/1697811
Page Count: 2

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Topics: Astrocytes, Cell membranes, Potassium, Neurons, Neuroglia, Brain, Optic nerve, P branes, Depolarization, Retina
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Abstract

The distribution of potassium conductance over the surface of freshly dissociated salamander astrocytes was determined by monitoring cell depolarizations evoked by focal increases in the extracellular potassium concentration. The specific potassium conductance of the endfoot processes of these cells was approximately tenfold higher than the conductance of other cell regions. This dramatically nonuniform conductance distribution may play an important role in the regulation of extracellular potassium levels by glia in the brain.

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