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BioMed Research International
Volume 2013 (2013), Article ID 960126, 11 pages
http://dx.doi.org/10.1155/2013/960126
Clinical Study

Microtubule-Associated Proteins in Mesial Temporal Lobe Epilepsy with and without Psychiatric Comorbidities and Their Relation with Granular Cell Layer Dispersion

1Ribeirao Preto Medical School, Department of Neurosciences and Behavior, University of Sao Paulo (USP), Avenida Bandeirantes 3900, 14049-900 Ribeirao Preto, SP, Brazil
2Center for Interdisciplinary Research on Applied Neurosciences (NAPNA), USP, Avenida Bandeirantes 3900, 14049-900 Ribeirao Preto, SP, Brazil
3National Institute of Science and Technology in Translational Medicine (INCT-TM/CNPq), Avenida Bandeirantes 3900, 14049-900 Ribeirao Preto, SP, Brazil
4Ribeirao Preto Medical School, Department of Surgery, USP, Avenida Bandeirantes 3900, 14049-900 Ribeirao Preto, SP, Brazil

Received 30 April 2013; Revised 19 July 2013; Accepted 24 July 2013

Academic Editor: Johan Pallud

Copyright © 2013 Ludmyla Kandratavicius et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. Despite strong association between epilepsy and psychiatric comorbidities, biological substrates are unknown. We have previously reported decreased mossy fiber sprouting in mesial temporal lobe epilepsy (MTLE) patients with psychosis and increased in those with major depression. Microtubule associated proteins (MAPs) are essentially involved in dendritic and synaptic sprouting. Methods. MTLE hippocampi of subjects without psychiatric history, MTLE + major depression, and MTLE + interictal psychosis derived from epilepsy surgery and control necropsies were investigated for neuronal density, granular layer dispersion, and MAP2 and tau immunohistochemistry. Results. Altered MAP2 and tau expression in MTLE and decreased tau expression in MTLE with psychosis were found. Granular layer dispersion correlated inversely with verbal memory scores, and with MAP2 and tau expression in the entorhinal cortex. Patients taking fluoxetine showed increased neuronal density in the granular layer and those taking haloperidol decreased neuronal density in CA3 and subiculum. Conclusions. Our results indicate relations between MAPs, granular layer dispersion, and memory that have not been previously investigated. Differential MAPs expression in human MTLE hippocampi with and without psychiatric comorbidities suggests that psychopathological states in MTLE rely on differential morphological and possibly neurochemical backgrounds. This clinical study was approved by our institution’s Research Ethics Board (HC-FMRP no. 1270/2008) and is registered under the Brazilian National System of Information on Ethics in Human Research (SISNEP) no. 0423.0.004.000-07.