Exp Mol Med.  2004 Apr;36(2):185-191.

Proteomic analysis of human cerebral cortex in epileptic patients

• Eun JP
• Choi HY
• Kwak YG

Abstract

Epilepsy affects more than 0.5% of the world population and is known to be associated with a large genetic component eliciting an electrical hyperexcitability in the central nervous system. However, its pathogenic mechanisms remain poorly understood. In order to gain greater molecular incite in the pathogenesis in epilepsy, we analyzed proteomes of human cerebral cortices. Quantitative proteome analysis was used to compare signals corresponding to individual proteins between epileptic cerebral cortices from patients with temporal lobe epilepsy and age-matched non-epileptic subjects. To minimize individual variations, gender and age of the patients were matched. Changes of several spots were consistent among 6 pairs of epileptic patients and nonepileptic subjects. One of the spots was identified as the mitochondrial type Mn-superoxide dismutase (Mn-SOD) confirmed by Western blot analysis with Mn-SOD antibody and enzyme activity assay. Such results were agreeable with chemical and physical parameters given by the 2-dimensional electrophoresis (2-DE) gel. Mn-SOD was consistently down-regulated in epileptic cerebral cortices compared with those of nonepileptic subjects. Our results demonstrate a clear link between pathogenesis of epilepsy and SOD. Additionally, we identified four proteins that were consistently over-expressed in all epileptic temporal neocortices specimens and the other four proteins that were found to be expressed less than non-epileptic control subjects. These proteomic data provide cellular markers in the understanding mechanism of the epilepsy pathogenesis.

Keyword

cerebral cortex; epilepsy; proteomics; superoxide dismutase; temporal lobe

MeSH Terms

Adult
Biological Markers/analysis
Brain Chemistry
Case-Control Studies
Cerebral Cortex/chemistry/*metabolism
Down-Regulation
Electrophoresis, Gel, Two-Dimensional
Epilepsy/genetics/*metabolism
Female
Humans
Male
Middle Aged
Mitochondria/chemistry/genetics/*metabolism
Nerve Tissue Proteins/chemistry/genetics/*metabolism
Proteomics
Research Support, Non-U.S. Gov't
Superoxide Dismutase/analysis/genetics/*metabolism
Up-Regulation