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Increase in antiepileptic efficacy during prolonged treatment with valproic acid: Role of inhibition of histone deacetylases? by Katrin Hoffmann; Marion Czapp; Wolfgang Löscher is a Medicine article available to read on EtoBox.

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Valproic acid (VPA) is a major antiepileptic drug (AED) with efficacy against multiple seizure types. It has a rapid onset of action but its anticonvulsant activity increases during prolonged treatment, which cannot be explained by drug or metabolite accumulation in plasma or brain. Among numerous other effects on diverse drug targets, VPA is an inhibitor of histone deacetylases (HDACs) that are involved in modulation of gene expression. The functional consequences of HDAC inhibition typically develop slowly during treatment with HDAC inhibitors such as VPA. We therefore hypothesized that inhibition of brain HDACs by VPA and resultant increases in gene expression could explain the increase in anticonvulsant activity during prolonged treatment with this drug. This hypothesis was tested by comparing the effects of VPA and the selective HDAC inhibitor, trichostatin A (TSA), in a mouse model of generalized seizures. Intravenous infusion of pentylenetetrazole (PTZ) was used to determine the effects of the drugs on different seizure types, i.e., myoclonic, clonic and tonic seizures. VPA (200 mg/kg b.i.d.) rapidly increased PTZ thresholds to all seizure types, but this effect increased up

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Author

Katrin Hoffmann; Marion Czapp; Wolfgang Löscher

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-1211)

Published

2008

Language

EN

Field

Medicine (Health Sciences)