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Inward rectification in Limulus ventral photoreceptors

Published online by Cambridge University Press:  02 June 2009

Cynthia L. Phillips,
Juan Bacigalupo and
Peter M. O'Day
Cynthia L. Phillips
Affiliation:
Institute of Molecular Biology, University of Oregon, Eugene
Juan Bacigalupo
Affiliation:
Departmento de Biologia, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
Peter M. O'Day
Affiliation:
Institute of Neuroscience, University of Oregon, Eugene
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Abstract

We examined inward rectification in Limulus ventral photoreceptors using the two-microelectrode voltage clamp. Hyperpolarization in the dark induced an inward current whose magnitude was distinctly dependent on extracellular K+ concentration, [K+0]. The [K+0] dependence resembled the characteristic [K+0] dependence of other inward rectifiers. The inward current was not dependent on extracellular Ca2+ or Na+, and it was unaffected by intracellular injection of Cl−. The hyperpolarization induced currents had two phases, an early nearly instantaneous phase and a slowly developing late phase. The currents were sensitive to extracellular barium and cesium. In voltage-pulse experiments, the magnitudes of the inwardly rectifying currents were variable from cell to cell, with some cells exhibiting negligible inward currents. Large hyperpolarizations (to membrane potentials more negative than about – 140 mV) caused unstable inward current recordings, irreversible desensitization, and irreversible elevation of intracellular Ca2+ concentration. The inward rectifier provides negative feedback by tending to depolarize the cell (with inward current) in response to hyperpolarization. We suggest that the inward rectifier reduces the amount of hyperpolarization that would otherwise be generated by electrogenic processes. This feature would restrict the dynamic voltage range of the photoreceptors at very hyperpolarized potentials.

Keywords

Inward rectifierAnomalous rectifierK+-channelMembrane conductancePhotoreceptorLimulus

Information

Type
Research Articles
Information
Visual Neuroscience , Volume 8 , Issue 1 , January 1992, pp. 19 - 25
Copyright
Copyright © Cambridge University Press 1992

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