Nitric oxide synthase expression in the cerebral cortex of patients with epilepsy.

Abstract:

PURPOSE:Nitric oxide (NO), a short-lived radical synthesized from L-arginine by activation of the enzyme nitric oxide synthase (NOS), has been implicated in the pathophysiology of epilepsy by some investigators. However, the current data about NO and NOS in epilepsy are controversial and are derived only from animal models of epilepsy. In this study we investigated possible changes in NOS expression in the cerebral cortex of patients with epilepsy. METHODS:Qualitative and quantitative parameters of the immunolabeling pattern of the neuronal, endothelial, and inducible isoforms of NOS were analyzed in biopsy material obtained from patients with short and long seizure history and from patients without epilepsy. RESULTS:The comparative study showed that in the cerebral cortex of patients with epilepsy, particularly in those with a long seizure history, the number and labeling intensity of NOS-positive neurons increased, and that a subpopulation of nonpyramidal GABAergic neurons (type II NOS neurons) was responsible for this phenomenon. CONCLUSIONS:The fact that NOS upregulation is more evident in patients with a long seizure history suggests that this is a consequence of seizures, acting probably as an adaptative response to the sustained release of excitatory amino acids.

journal_name

Epilepsia

journal_title

Epilepsia

authors

González-Hernández T,García-Marín V,Pérez-Delgado MM,González-González ML,Rancel-Torres N,González-Feria L

doi

10.1111/j.1528-1157.2000.tb04603.x

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

1259-68

issue

10

eissn

0013-9580

issn

1528-1167

journal_volume

41

pub_type

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