Abstract
Müller (glial) cells were isolated from rabbit retinae by papaine and mechanical dissociation. The cells were fixed on a gelatine-covered glass slide by means of concanavalin A, and the slide was mounted in a perfusion chamber under a light microscope with modified optics. Besides the recording microelectrode, two other micropipettes could be adjusted with their tips near the cell. These micropipettes were used for application of test solutions into the environment of the cells. On application of high K+ solutions, the cell depolarized strongly but during prolonged application there was a marked repolarization. After the end of high K+ application the cells showed a hyperpolarization which was enhanced in both amplitude and duration with prolongation of the K+ exposure. Both repolarization and afterhyperpolarization disappeared under ouabain. Ouabain application itself caused a small reversible depolarization. Na+ free solution caused hyperpolarization. The results suggest the existence of an active membrane pump mechanism in our cells. This pump seems to be electrogenic under our experimental conditions and seems to be activated even in the absence of sodium. The cell membrane is demonstrated to contain a significant Na+ conductance.
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