Title:Valproic Acid and Epilepsy: From Molecular Mechanisms to Clinical Evidences
Volume: 17
Issue: 10
Author(s): Michele Romoli, Petra Mazzocchetti, Renato D'Alonzo, Sabrina Siliquini, Victoria Elisa Rinaldi, Alberto Verrotti, Paolo Calabresi and Cinzia Costa*
Affiliation:
- Neurology Clinic, University of Perugia – S. Maria della Misericordia Hospital, Perugia,Italy
Keywords:
Valproic acid, epilepsy, epileptogenesis, neuroprotection, pharmacology, epigenetics.
Abstract: After more than a century from its discovery, valproic acid (VPA) still represents one of
the most efficient antiepileptic drugs (AEDs). Pre and post-synaptic effects of VPA depend on a
very broad spectrum of actions, including the regulation of ionic currents and the facilitation of
GABAergic over glutamatergic transmission. As a result, VPA indirectly modulates neurotransmitter
release and strengthens the threshold for seizure activity. However, even though participating to
the anticonvulsant action, such mechanisms seem to have minor impact on epileptogenesis. Nonetheless,
VPA has been reported to exert anti-epileptogenic effects. Epigenetic mechanisms, including
histone deacetylases (HDACs), BDNF and GDNF modulation are pivotal to orientate neurons
toward a neuroprotective status and promote dendritic spines organization. From such broad spectrum
of actions comes constantly enlarging indications for VPA. It represents a drug of choice in
child and adult with epilepsy, with either general or focal seizures, and is a consistent and safe IV
option in generalized convulsive status epilepticus. Moreover, since VPA modulates DNA transcription
through HDACs, recent evidences point to its use as an anti-nociceptive in migraine prophylaxis,
and, even more interestingly, as a positive modulator of chemotherapy in cancer treatment.
Furthermore, VPA-induced neuroprotection is under investigation for benefit in stroke and
traumatic brain injury. Hence, VPA has still got its place in epilepsy, and yet deserves attention for
its use far beyond neurological diseases. In this review, we aim to highlight, with a translational
intent, the molecular basis and the clinical indications of VPA.