Depression of spike adaptation and afterhyperpolarization by 4-aminopyridine in hippocampal neurons.

Abstract:

:In guinea pig hippocampal slices, 4-aminopyridine (4-AP) in concentrations of 100-500 microM reduced the adaptation of CA3 pyramidal neurons to depolarizing stimuli, resulting in a prolongation of repetitive firing during injection of long-lasting depolarizing currents. Concurrently, there was a decrease in the 'sag' of potential after spike bursts. Furthermore, 4-AP decreased or abolished the hyperpolarizing potential (the afterhyperpolarization) which normally followed repetitive firing of the neurons. The findings suggest that 4-AP could interfere with the Ca2+-activated K+ current in hippocampal CA3 pyramidal neurons.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Matsuda Y,Yoshida S,Fujimura K,Nakamura M

doi

10.1016/0304-3940(86)90281-8

subject

Has Abstract

pub_date

1986-04-24 00:00:00

pages

316-20

issue

3

eissn

0304-3940

issn

1872-7972

pii

0304-3940(86)90281-8

journal_volume

65

pub_type

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