The Journal of General Physiology
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The Journal of General Physiology, Vol 58, 544-561, Copyright © 1971 by The Rockefeller University Press

ARTICLE

Two Light-Induced Processes in the Photoreceptor Cells of Limulus Ventral Eye

J. E. Lisman 1 and J. E. Brown 1

1 From the Department of Biology and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 and the Marine Biological Laboratory, Woods Hole, Massachusetts 02543

The dark-adapted current-voltage (I-V) curve of a ventral photoreceptor cell of Limulus, measured by a voltage-clamp technique, has a high slope-resistance region more negative than resting voltage, a lower slope-resistance region between resting voltage and zero, and a negative slope-resistance region more positive than 0 v. With illumination, we find no unique voltage at which there is no light-induced current. At the termination of illumination, the I-V curve changes quickly, then recovers very slowly to a dark-adapted configuration. The voltage-clamp currents during and after illumination can be interpreted to arise from two separate processes. One process (fast) changes quickly with change in illumination, has a reversal potential at +20 mv, and has an I-V curve with positive slope resistance at all voltages. These properties are consistent with a light-induced change in membrane conductance to sodium ions. The other process (slow) changes slowly with changes in illumination, generates light-activated current at +20 mv, and has an I-V curve with a large region of negative slope resistance. The mechanism of this process cannot as yet be identified.

Submitted on March 4, 1971


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R. J. LEONARD and J. E. LISMAN
Light Modulates Voltage-Dependent Potassium Channels in Limulus Ventral Photoreceptors
Science, June 12, 1981; 212(4500): 1273 - 1275.
[Abstract] [PDF]


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