Hippocampal slices from kindled rats show an increased sensitivity for induction of epileptiform activity by changes in extracellular ion concentrations.

Abstract:

:The ability of increases in extracellular potassium ([K+]o) and/or decreases in extracellular calcium ([Ca2+]o) to induce epileptiform activity in hippocampal slices was studied by systematically varying [K+]o and [Ca2+]o. Slices prepared from kindled rats, both 1 week and 1 month after the last kindled seizure, showed an increased sensitivity to perturbations of both ions. Stimulus-locked epileptiform discharges occurred with small displacements of [K+]o and/or [Ca2+]o. The ionic threshold for spontaneous epileptiform discharges was not significantly affected. This long-lasting change in sensitivity to the ionic environment produced by the kindling process had important implications for epileptogenesis in chronically epileptic tissue.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Stringer JL,Lothman EW

doi

10.1016/0304-3940(88)90478-8

subject

Has Abstract

pub_date

1988-06-17 00:00:00

pages

43-8

issue

1

eissn

0304-3940

issn

1872-7972

pii

0304-3940(88)90478-8

journal_volume

89

pub_type

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