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Science 28 April 1978:
Vol. 200. no. 4340, pp. 437 - 439
DOI: 10.1126/science.644308
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Articles

Science, Vol 200, Issue 4340, 437-439
Copyright © 1978 by American Association for the Advancement of Science

articles

Potassium activation associated with intraneuronal free calcium

R Eckert and D Tillotson

Relations between calcium entry and activation of a calcium-dependent outward current during depolarization were examined under voltage clamp in dorid giant neurons injected with the calcium-sensitive photoprotein aequorin. Activation kinetics and amplitude of the slow calcium-dependent component were both found to be related to the rate and extent of free calcium accumulation and to the electromotive force acting on potassium ions, independent of the calcium activation kinetics. This indicates that the activation of the calcium-dependent outward current is more closely related to the transient intracellular accumulation of free calcium ions than to the movement of calcium through the plasma membrane during depolarization.


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