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Martinez-Levy, G. A; Rocha, L; Lubin, F. D; Alonso-Vanegas, M. A; Nani, A; Buentello-Garcia, R. M; Perez-Molina, R; Briones-Velasco, M; Recillas-Targa, F; Perez-Molina, A; San-Juan, D; Cienfuegos, J; Cruz-Fuentes, C. S (2016)

INCREASED EXPRESSION OF BDNF TRANSCRIPT WITH EXON VI IN HIPPOCAMPI OF PATIENTS WITH PHARMACO-RESISTANT TEMPORAL LOBE EPILEPSY

Neuroscience 314():12-21
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A putative role of the brain-derived neurotrophic factor (BDNF) in epilepsy has emerged from in vitro and animal models, but few studies have analyzed human samples. We assessed the BDNF expression of transcripts with exons I (BDNFI), II (BDNFII), IV (BDNFIV) and VI (BDNFVI) and methylation levels of promoters 4 and 6 in the hippocampi of patients with pharmaco-resistant temporal lobe epilepsy (TLE) (n=24). Hippocampal sclerosis (HS) and pre-surgical pharmacological treatment were considered as clinical independent variables. A statistical significant increase for the BDNFVI (p<0.05) was observed in TLE patients compared to the autopsy control group (n=8). BDNFVI was also increased in anxiety/depression TLE (N=4) when compared to autopsies or to the remaining group of patients (p<0.05). In contrast, the use of the antiepileptic drug Topiramate (TPM) (N=3) was associated to a decrease in BDNFVI expression (p<0.05) when compared to the remaining group of patients. Methylation levels at the BDNF promoters 4 and 6 were similar between TLE and autopsies and in relation to the use of either Sertraline (SRT) or TPM. These results suggest an up-regulated expression of a specific BDNF transcript in patients with TLE, an effect that seems to be dependent on the use of specific drugs.