Potassium currents contributing to action potential repolarization in dissociated cultured rat superior cervical sympathetic neurones.

Abstract:

:Pharmacological blocking agents were used to assess the contributions of different K(+)-currents to spike-repolarization and early spike-afterhyperpolarization recorded in dissociated, tissue-cultured rat superior cervical sympathetic neurones using both patch-clamp and impalement microelectrode techniques. Effects of 4-aminopyridine (4-AP) and tetraethylammonium (TEA), in concentrations which selectively reduced the delayed rectifier current IK(DR) and Ca(2+)-activated K(+)-current IK(Ca, fast), respectively, indicated that IK(DR) made a significant contribution to both spike repolarization and spike afterhyperpolarization under all recording conditions, whereas the contribution of IK(Ca,fast) depended on the level of intracellular Ca(2+)-buffering. No evidence for a significant role for the transient current IK(A) could be adduced in these experiments.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Marsh SJ,Brown DA

doi

10.1016/0304-3940(91)90593-i

subject

Has Abstract

pub_date

1991-12-09 00:00:00

pages

298-302

issue

2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(91)90593-I

journal_volume

133

pub_type

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