Sodium valproate at the therapeutic concentration inhibits the induction but not the maintenance phase of long-term potentiation in rat hippocampal CA1 area

Biochemical and Biophysical Research Communications
Peng WuHengSheng Chen

Abstract

Sodium valproate (VPA) is currently one of the major antiepileptic drugs and has been reported to impair the induction of long-term potentiation (LTP) in rat hippocampal. However, there are discrepancies when used at therapeutic dose and few researches to study the effects of VPA on the maintenance of LTP. Here we investigated the effects of VPA at therapeutic concentration on two LTP phases: induction and maintenance in CA1 region. We found (1) VPA inhibited field excitatory postsynaptic potentials (fEPSPs) without modifying paired-pulse facilitation (PPF) solely occurred presynaptically as a form of synaptic plasticity. (2) Pretreatment with VPA before high-frequency stimulation (HFS) decreased the fEPSPs slope. (3) There were no significant changes in fEPSPs slope with VPA applied in maintenance phase of LTP. These results indicate that VPA inhibited the induction of LTP postsynaptically without modifying presynaptic neurotransmitter release and had no significant influence on the two maintenance phase of LTP.

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Citations

Dec 8, 2015·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·Jingquan GaoLijie Wu
Jun 11, 2011·Movement Disorders : Official Journal of the Movement Disorder Society·Nils DannerEsa Mervaala
Mar 22, 2016·Expert Reviews in Molecular Medicine·Wei WangJing Luo

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