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BMC Neurology

, 12:15

First Online: 14 March 2012Received: 02 October 2011Accepted: 14 March 2012


BackgroundTemporal lobe epilepsy TLE is a common form of focal epilepsy. Serum biomarkers to predict cognitive performance in TLE patients without psychiatric comorbidities and the link with gray matter GM atrophy have not been fully explored.

MethodsThirty-four patients with TLE and 34 sex - and age-matched controls were enrolled for standardized cognitive tests, neuroimaging studies as well as measurements of serum levels of heat shock protein 70 HSP70, S100ß protein S100ßP, neuronal specific enolase NSE, plasma nuclear and mitochondrial DNA levels.

ResultsCompared with the controls, the patients with TLE had poorer cognitive performances and higher HSP70 and S100ßP levels p < 0.01. The patients with higher frequencies of seizures had higher levels of HSP70, NSE and S100ßP p < 0.01. Serum HSP70 level correlated positively with duration of epilepsy σ = 0.413, p < 0.01, and inversely with memory scores in the late registration σ = −0.276, p = 0.01 and early recall score σ = −0.304, p = 0.007. Compared with the controls, gray matter atrophy in the hippocampal and parahippocampal areas, putamen, thalamus and supplementary motor areas were found in the patient group. The HSP70 levels showed an inverse correlation with hippocampal volume R square = 0.22, p = 0.007 after controlling for the effect of age.

ConclusionsOur results suggest that serum biomarkers were predictive of higher frequencies of seizures in the TLE group. HSP70 may be considered to be a stress biomarker in patients with TLE in that it correlated inversely with memory scores and hippocampal volume. In addition, the symmetric extratemporal atrophic patterns may be related to damage of neuronal networks and epileptogenesis in TLE.

KeywordsBiomarkers Neuropsychological performances Temporal lobe epilepsy Gray matter atrophy Heat shock proteins Electronic supplementary materialThe online version of this article doi:10.1186-1471-2377-12-15 contains supplementary material, which is available to authorized users.

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Autor: Chiung-Chih Chang - Chun-Chung Lui - Chen-Chang Lee - Shang-Der Chen - Wen-Neng Chang - Cheng-Hsien Lu - Nai-Ching Chen - A


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