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Journal of Neuroscience, Vol 10, 1886-1891, Copyright © 1990 by Society for Neuroscience
Differentiation of IKA in amphibian spinal neurons
AB Ribera and NC Spitzer
Department of Biology, University of California, San Diego, La Jolla 92093.
We have examined the development of an inactivating outward current in
embryonic amphibian neurons differentiating in culture. On the basis of
ionic selectivity, voltage dependence of activation and inactivation and
pharmacological sensitivity, it is similar to A currents described in other
neurons. In these embryonic neurons the A current appears later than other
voltage-dependent currents studied previously. Furthermore, its maturation
extends to times later than those required for the differentiation of
another potassium current, the voltage- dependent delayed rectifier. These
changes in A current are consistent with parallel changes in the action
potential and excitability of the developing neurons.
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