Mitochondrial complex I deficiency in the epileptic focus of patients with temporal lobe epilepsy.

Abstract:

:Mitochondria are cellular organelles crucial for energy supply and calcium homeostasis in neuronal cells, and their dysfunction causes seizure activity in some rare human epilepsies. To directly test whether mitochondrial respiratory chain enzymes are abnormal in the most common form of chronic epilepsy, temporal lobe epilepsy (TLE), living human brain specimens from 57 epileptic patients and 2 nonepileptic controls were investigated. In TLE patients with a hippocampal epileptic focus, we demonstrated a specific deficiency of complex I of the mitochondrial respiratory chain in the hippocampal CA3 region. In contrast, TLE patients with a parahippocampal epileptic focus showed reduced complex I activity only in parahippocampal tissue. Inhibitor titrations of the maximal respiration rate of intact human brain slices revealed that the observed reduction in complex I activity is sufficient to affect the adenosine triphosphate production rate. The abnormal complex I activity in the hippocampal CA3 region was paralleled by increased succinate dehydrogenase staining of neurons and marked ultrastructural abnormalities of mitochondria. Therefore, mitochondrial dysfunction is suggested to be specific for the epileptic focus and may constitute a pathomechanism contributing to altered excitability and selective neuronal vulnerability in TLE.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Kunz WS,Kudin AP,Vielhaber S,Blümcke I,Zuschratter W,Schramm J,Beck H,Elger CE

keywords:

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

766-73

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

48

pub_type

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