Amygdala kindling of forebrain seizures and the occurrence of brainstem seizures in genetically epilepsy-prone rats.

Abstract:

:Forebrain seizures were kindled in rats by daily electrical stimulation of the amygdala. Genetically epilepsy-prone rats scoring 9 (GEPR-9s) on the seizure severity scale during audiogenic seizure (AGS) screening ("brainstem seizure-experienced") required fewer stimulations to achieve fully kindled seizures (forelimb clonus with rearing and falling) than control rats. AGS-naive GEPR-9s required an intermediate number of stimulations, indicating a role for both genetic predisposition and previous acoustically evoked brainstem seizure experience. Other forebrain kindling indices such as afterdischarge threshold/duration and seizure latency/duration also involved genetic as well as phenotypic (previous seizure experience) factors. In most GEPR-9s in both groups, severe brainstem seizures occurred after forebrain stimulation. The occurrence of brainstem seizures had a random nature and was not related to the sequence of kindling-dependent forebrain seizure progression. The lack of a difference in the occurrence of brainstem seizures between seizure-experienced and AGS-naive GEPR-9s suggest that genetic predisposition is the major factor in forebrain seizure-induced activation of brainstem seizure circuitry. This brainstem seizure activity appears to model pertinent aspects of secondary generalization observed in human partial seizures.

journal_name

Epilepsia

journal_title

Epilepsia

authors

Coffey LL,Reith ME,Chen NH,Mishra PK,Jobe PC

doi

10.1111/j.1528-1157.1996.tb00011.x

subject

Has Abstract

pub_date

1996-02-01 00:00:00

pages

188-97

issue

2

eissn

0013-9580

issn

1528-1167

journal_volume

37

pub_type

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